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ABB 3AFV98777773 Auxiliary Power Slipring | AUX POWER SLIPRING / B | for AZIPOD 17...25 CS ZRDA | Podded Electric Propulsion System Spare Part | O.D. Ø130mm I.D. Ø119.5mm Thickness 3mm | Copper Alloy

ABB 3AFV98777773 Auxiliary Power Slipring (AUX POWER SLIPRING / B), designed for AZIPOD 17...25 CS and ZRDA podded electric propulsion systems, manufactured by ABB Oy, Marine Finland. Slipring outer diameter Ø130mm, inner diameter Ø119.5mm, thickness 3mm, copper alloy annular conductive ring with terminal lug. As a critical rotary transmission component in the Azipod system, it continuously transmits auxiliary power from the ship's fixed hull to the rotating pod during 360° full azimuth rotation

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Product Details

1. Product Overview

The ABB 3AFV98777773 Auxiliary Power Slipring (AUX POWER SLIPRING / B) is a critical rotary conductive component in ABB's Azipod® podded electric propulsion system, designed for AZIPOD 17...25 CS and ZRDA propulsion units, manufactured by ABB Oy, Marine Finland. This slipring performs the essential function of transmitting auxiliary power from the ship's fixed electrical system to the rotating pod interior during 360° full azimuth rotation, ensuring continuous and stable power supply to auxiliary equipment within the pod — including propulsion motor cooling, steering control, monitoring instruments, heating and dehumidification, lighting and ventilation — at any rotation angle.

Azipod® (Azimuthing Electric Podded Drive) is a revolutionary marine propulsion technology introduced by ABB in 1990. The propulsion motor is installed directly inside a submerged pod outside the ship hull, with the propeller mounted directly on the motor shaft, eliminating traditional gearboxes, shaft lines and rudders. The pod can rotate 360° with thrust in any direction. Compared to conventional shaft-line propulsion, Azipod systems can reduce fuel consumption by up to 20%, significantly improve vessel maneuverability, and reduce noise and vibration, becoming the preferred propulsion solution for luxury cruise ships, polar icebreakers, offshore vessels and research ships, with over 9 million cumulative operating hours worldwide.

In the Azipod system, the slipring is the electrical hub connecting the fixed hull portion to the rotating pod portion. Since the pod must rotate 360° continuously relative to the hull, fixed cables cannot be used directly — power and signal transmission must be achieved through a slipring-and-brush mechanism under rotating conditions. The Auxiliary Power Slipring specifically handles transmission of auxiliary power (excluding main propulsion power), including control power, cooling systems, monitoring sensors, heating/dehumidification, lighting and other auxiliary circuits within the pod. Main propulsion power is typically transmitted through a separate main power slipring or rotary transformer, while the auxiliary power slipring handles all other auxiliary power circuits, making it an indispensable component for normal pod operation.

This product is designated AUX POWER SLIPRING / B, where "/B" indicates Type B configuration or Version B, suitable for AZIPOD 17...25 CS and ZRDA series propulsion units. The AZIPOD 17...25 CS is a medium-to-high power model in the Azipod family, covering the 17MW to 25MW power range, primarily applied to large luxury cruise ships, polar icebreakers and heavy offshore vessels with high propulsion power requirements. ZRDA is a specific configuration model in the Azipod system, possibly corresponding to a particular steering mechanism, cooling system or control architecture configuration.

Mechanically, this auxiliary power slipring features a ring design with an outer diameter of 130mm, inner diameter of 119.5mm, and thickness of 3mm, forming a flat annular shape. The ring body is made of copper alloy (golden appearance), offering excellent electrical conductivity, wear resistance and corrosion resistance, suitable for long-term reliable operation under rotating conductive contact conditions. The ring body features a terminal lug for connecting external cables, conducting current to or from the slipring surface. During operation, the slipring works with carbon brushes held under spring pressure against the slipring surface, achieving current transmission between rotating and stationary parts through sliding contact.

The slipring operates inside the Azipod pod's Steering Module, typically in a relatively enclosed space, with ambient temperature influenced by vessel operating conditions, and possible vibration and humidity. The copper alloy slipring paired with carbon brushes is a long-proven industrial solution with low contact resistance, stable conduction, wear resistance and long service life — the classic and reliable approach for rotating conductive transmission. The slipring surface must be kept clean and smooth, with periodic inspection of brush wear and slipring surface condition to ensure good contact and avoid power interruption, sparking or overheating caused by poor contact.

As a dedicated spare part for the Azipod propulsion system, replacement of the 3AFV9877773 auxiliary power slipring is typically performed during drydocking or specialized Azipod maintenance. When replacing the slipring, the 配套 carbon brush assembly, brush holders, spring pressure, insulation structure and terminals should be inspected simultaneously to ensure the entire rotary conductive system is in good condition. Sliprings are wear components; after long-term operation, surface wear grooves, oxidation layers or electrical erosion marks may appear. When wear exceeds allowable limits or contact resistance increases significantly, timely replacement is required to avoid compromising auxiliary power supply reliability.

ABB Oy, Marine Finland is ABB Group's marine business unit in Finland, serving as the global design, manufacturing and service center for Azipod podded propulsion systems, with over 30 years of Azipod R&D and operational experience. As an original design spare part for the Azipod system, this slipring's dimensions, materials, electrical performance and mechanical interfaces strictly match the design requirements of AZIPOD 17...25 CS and ZRDA propulsion units, ensuring installation interchangeability and operational reliability.

2. Specifications

表格

Parameter	Value
Brand	ABB (ABB Oy, Marine Finland)
Material No.	3AFV98777773
Product Name	AUX POWER SLIPRING / B
Product Type	Auxiliary Power Slipring (rotary conductive ring)
Applicable Model	AZIPOD 17...25 CS, ZRDA
System	Azipod® Podded Electric Propulsion System
Function	Transmit auxiliary power during 360° pod rotation
Structure	Flat annular ring
Outer Diameter (O.D.)	Ø130 mm
Inner Diameter (I.D.)	Ø119.5 mm
Thickness	3 mm
Ring Material	Copper alloy (conductive copper ring, golden appearance)
Terminal	With terminal lug (one terminal on ring body)
Matching Brush	Carbon brush (required, ordered separately)
Rated Voltage	To be confirmed (auxiliary circuit, reference AC/DC 24V-440V)
Rated Current	To be confirmed (reference 10A-50A per ring, per circuit config)
Contact Resistance	To be confirmed (reference ≤1mΩ, new ring condition)
Max Rotational Speed	To be confirmed (Azipod steering speed, reference 0-10 rpm)
Operating Temperature	To be confirmed (reference -25°C ~ +85°C, pod interior)
Protection Class	To be confirmed (installed inside steering module, reference IP20-IP54)
Insulation Resistance	To be confirmed (reference ≥100MΩ @ 500VDC)
Dielectric Test	To be confirmed
Service Life	To be confirmed (reference 10000-20000 hours, depending on conditions)
Wear Limit	To be confirmed (reference radial wear ≤0.5mm requires replacement)
Surface Roughness	To be confirmed (reference Ra ≤0.8μm, working surface)
Hardness	To be confirmed (copper alloy, reference HB 80-120)
Weight	To be confirmed (reference approx. 0.3-0.5kg)
Packaging	To be confirmed (shock-proof moisture-proof individual packaging)
Country of Origin	Finland (ABB Oy, Marine Finland)
Related Products	Carbon brush assembly, brush holder, spring, main power slipring, signal slipring
Replacement Interval	To be confirmed (inspect/replace per Azipod overhaul cycle)
Stock Status	Order available
Warranty	12 months

3. Key Features

Azipod System Dedicated, Precision-Matched for 17-25MW Pods — The 3AFV9877773 auxiliary power slipring is specifically designed for ABB Azipod® podded electric propulsion systems, suitable for AZIPOD 17...25 CS and ZRDA propulsion units. Dimensions, interfaces and electrical performance strictly match original design requirements, ensuring installation interchangeability and operational reliability. As a critical rotary conductive component in the Azipod system, it directly affects auxiliary power supply continuity and is an important spare part for propulsion system maintenance.
360° Full Azimuth Continuous Power, Auxiliary Systems Never Lose Power — The core function of the slipring is to continuously transmit auxiliary power from the ship's fixed electrical system to the rotating pod interior through sliding contact between slipring and carbon brushes during 360° full azimuth rotation, ensuring auxiliary equipment within the pod — propulsion motor cooling, steering control, monitoring sensors, heating/dehumidification, lighting/ventilation — receives continuous and stable power at any rotation angle, without power interruption due to pod rotation.
Copper Alloy Ring, Excellent Conductivity, Wear and Corrosion Resistant — The slipring body is made of copper alloy, offering excellent electrical conductivity (low contact resistance), good wear resistance (suitable for long-term sliding contact) and outstanding corrosion resistance (adapted to marine environments). The copper alloy is precision-machined with a smooth, flat surface, providing stable contact with carbon brushes, low sparking and low temperature rise, ensuring long-term reliable rotary conductive transmission. The golden appearance is characteristic of copper alloy.
Precision Annular Dimensions: O.D. 130mm, I.D. 119.5mm, Thickness 3mm — The slipring adopts a flat annular design with O.D. Ø130mm, I.D. Ø119.5mm and thickness 3mm, with precise dimensions and uniform ring body. The flat annular structure fits within the limited space of the Azipod steering module, installed coaxially with the rotating shaft, and multiple sliprings can be stacked to form a multi-circuit slipring assembly. Precise dimensions ensure accurate contact position with carbon brushes and uniform contact pressure, avoiding uneven wear or poor contact.
With Terminal Lug, Convenient Installation and Wiring — The ring body features a terminal lug for connecting external cables, conducting current to or from the slipring surface. The terminal design facilitates cable connection during installation and maintenance, ensuring reliable electrical connection. The terminal is integrated with the ring body or securely welded/riveted, providing low contact resistance and high mechanical strength, capable of withstanding vibration and thermal cycling without loosening.
Classic Carbon Brush Pairing, Industrially Proven High Reliability — The slipring works with carbon brushes held under spring pressure against the slipring surface, achieving current transmission between rotating and stationary parts through sliding contact. The slipring-and-brush mechanism is a classic and reliable solution for rotary conductive transmission, proven over decades of industrial use, featuring simple structure, convenient maintenance, online brush replacement capability and clear failure modes, widely applied to power and signal transmission in all types of rotating machinery.
Manufactured by ABB Marine Finland, Original Quality Guaranteed — Designed and manufactured by ABB Oy, Marine Finland, the global design, manufacturing and service center for Azipod podded propulsion systems within ABB Group, with over 30 years of Azipod R&D and operational experience and over 9 million cumulative operating hours worldwide. Original design and manufacturing ensure the slipring's material, workmanship, electrical performance and mechanical interfaces fully comply with Azipod system design specifications.
Low Contact Resistance Stable Transmission, Power Quality Assured — The copper alloy slipring surface is precision-machined and treated, providing low and stable contact resistance when paired with carbon brushes, ensuring low voltage drop, low temperature rise and stable power quality during auxiliary power transmission. Low contact resistance reduces transmission loss and heating, avoiding voltage drop, overheating or insulation aging caused by excessive contact resistance, and safeguarding power quality for sensitive electronic equipment and control circuits within the pod.
Wear-Resistant Long Life, Reasonable Maintenance Cycle — The copper alloy slipring and carbon brush pairing is optimized for low wear rate and long service life. Under normal operating conditions and regular maintenance, the slipring can operate reliably for extended periods, typically inspected and replaced during the Azipod pod's overhaul cycle. A reasonable maintenance cycle reduces drydocking frequency and cost, improving vessel operational efficiency. Slipring wear condition can be assessed by measuring surface wear, contact resistance and temperature rise.
Critical Spare Part Ensures Vessel Operational Safety, Reduces Downtime Risk — The auxiliary power slipring is a critical spare part of the Azipod propulsion system, its operating condition directly affecting auxiliary power supply continuity. Stocking and timely replacing qualified slipring spares avoids auxiliary power interruption, pod steering anomalies, monitoring failure and other issues caused by slipring wear or failure, ensures safe and reliable propulsion system operation, reduces unplanned downtime and drydocking risk — especially important for high-value vessels such as cruise ships and icebreakers.

4. Typical Applications

Luxury Cruise Ship Azipod Propulsion Systems: Large luxury cruise ships worldwide widely use Azipod podded propulsion (e.g., Royal Caribbean, Carnival, Norwegian Cruise Line flagship vessels), typically equipped with 2-4 Azipod units per ship. Each pod's steering module contains an auxiliary power slipring assembly for transmitting auxiliary power — cooling, control, monitoring, heating — during 360° full azimuth rotation, ensuring continuous reliable cruise ship propulsion operation.
Polar Icebreaker Propulsion Systems: Polar icebreakers (Finnish, Swedish, Russian, Chinese polar research icebreakers) use Azipod ice-class propulsion systems capable of bidirectional breaking in thick ice. Auxiliary power sliprings continuously transmit auxiliary power under extreme low temperature and high vibration conditions, ensuring heating/dehumidification, cooling monitoring and steering control systems operate normally.
Offshore Vessel Propulsion Systems: Offshore wind installation vessels, deepwater drilling rigs, pipelay vessels, crane vessels use Azipod propulsion for dynamic positioning (DP) and precise maneuvering. Auxiliary power sliprings ensure continuous auxiliary power during frequent azimuth rotation and DP operations, stabilizing propulsion, steering and control systems.
Research and Scientific Vessels: Oceanographic research ships, polar expedition vessels, deep submergence support vessels use Azipod propulsion for low-noise, high-maneuverability scientific operations. Auxiliary power sliprings ensure continuous power to research equipment interfaces, monitoring instruments and cooling systems.
Luxury Yachts and Superyachts: Large luxury yachts use Azipod CO or compact Azipod propulsion for improved maneuverability and comfort. Auxiliary power sliprings transmit auxiliary power during pod rotation, ensuring quiet, smooth yacht propulsion operation.
Ferries and Ro-Pax Vessels: Large ro-pax ferries, car ferries, train ferries use Azipod propulsion for improved port maneuverability and fuel efficiency. Auxiliary power sliprings ensure continuous auxiliary power during frequent port approaches and departures.
Specialty Vessels and Naval Auxiliaries: Diving support vessels, cable-laying ships, oil spill recovery vessels, hospital ships use Azipod propulsion. Auxiliary power sliprings ensure reliable auxiliary system power during specialized operation conditions.
Azipod System Periodic Maintenance and Spare Replacement: During drydocking, the Azipod pod steering module is disassembled and inspected, and worn auxiliary power sliprings and carbon brush assemblies are replaced — standard maintenance practice to ensure the slipring-brush system is in good condition for the next operating cycle.
Azipod System Emergency Repair and Replacement: When sliprings exhibit abnormal wear, electrical erosion, overheating or poor contact causing auxiliary power failure, emergency slipring replacement is required to restore pod auxiliary power and avoid affecting normal vessel operation.
Vessel Retrofit and Upgrade Projects: When upgrading older vessel propulsion to Azipod electric propulsion, auxiliary power slipring assemblies are required; or during Azipod system upgrades (control system, cooling system), matching slipring components are replaced.
Marine Spare Parts Inventory and Supply Chain Management: Ship management companies, cruise operators and offshore companies stock critical spares including auxiliary power sliprings for their Azipod fleets, establishing safety stock to ensure rapid replacement and minimize downtime loss.
Azipod System Training and Education: Maritime academies, crew training centers and ABB service centers use auxiliary power sliprings as physical training aids for Azipod system structure and maintenance training, helping crew and maintenance personnel understand slipring-brush rotary conductive principles and maintenance 要点.

5. Model Explanation

Material No.: 3AFV98777773

Product Name: AUX POWER SLIPRING / B

Applicable Model: AZIPOD 17...25 CS, ZRDA

Manufacturer: ABB Oy, Marine Finland

Product Description: Auxiliary Power Slipring, annular design, O.D. Ø130mm, I.D. Ø119.5mm, thickness 3mm, copper alloy material, with terminal lug, suitable for ABB Azipod® 17...25 CS and ZRDA podded electric propulsion systems, used to transmit auxiliary power from hull to rotating pod during 360° full azimuth rotation.

Material Number Coding:

表格

Segment	Meaning	Description
3AFV	ABB Marine product material no. prefix	ABB Marine & Ports product material number code segment
98777773	Sequence number	Unique product identification sequence number

Product Name Explanation:

AUX POWER = Auxiliary Power, distinct from Main Propulsion Power
SLIPRING = Rotary conductive ring for power transmission under rotation
/ B = Type B / Version B, specific configuration or version code

Applicable Model Explanation:

AZIPOD 17...25 CS: Azipod models in the 17MW to 25MW power range; CS may indicate specific structure or configuration series
ZRDA: Specific configuration model in Azipod system, possibly corresponding to particular steering mechanism, cooling system or control architecture

Azipod® Product Family Overview:

表格

Series	Power Range	Typical Applications
Azipod® C	1-4.5MW	Yachts, ferries, offshore support
Azipod® CO	1.7-7.2MW	Luxury yachts, ro-pax, offshore
Azipod® D/DO	5-15MW	Ferries, offshore, specialty
Azipod® V/VO	7.5-22MW	Cruise ships, icebreakers, offshore
Azipod® XO	12-22MW	Cruise ships, large offshore
Azipod® 17...25 CS	17-25MW	Large cruise ships, heavy icebreakers (this product)

Key Parameters Summary:

表格

Parameter	Value
Product Type	Auxiliary Power Slipring
Outer Diameter	Ø130 mm
Inner Diameter	Ø119.5 mm
Thickness	3 mm
Material	Copper alloy
Applicable Model	AZIPOD 17...25 CS, ZRDA
Function	Transmit auxiliary power during 360° rotation
Manufacturer	ABB Oy, Marine Finland
Origin	Finland

Related Components (ordered or inspected separately):

Carbon Brush: sliding contact component paired with slipring, wear item, requires periodic replacement
Brush Holder: fixes carbon brush and provides spring pressure
Pressure Spring: ensures constant brush-to-slipring contact pressure
Insulation Bushings/Separators: electrical insulation for multi-ring stacking
Main Power Slipring: large slipring for main propulsion power (separate component)
Signal Slipring: slipring for control and monitoring signals (separate component)

Official Documentation Reference:

Azipod® Product Introduction
Azipod® Maintenance Manual
Azipod® Spare Parts Catalog
Slipring & Brush Assembly Drawing
ABB Marine & Ports Service Documentation

6. Installation & Usage Instructions

Pre-Installation Preparation:

Confirm spare part material number (3AFV98777773) matches Azipod system spare parts list, confirm applicable model is AZIPOD 17...25 CS or ZRDA
Inspect slipring appearance: ring surface should be smooth, scratch-free, dent-free, no oxidation discoloration, no electrical erosion marks; terminal should be firm and not loose
Measure slipring dimensions: O.D. Ø130mm, I.D. Ø119.5mm, thickness 3mm, confirm consistency with old part or drawings
Inspect matching carbon brushes: brush length within allowable range (typically replace when worn to 1/2-2/3 of original length), brush surface smooth, no chipping or excessive wear
Inspect brush holders and springs: brush holders not deformed or jammed, spring pressure normal (reference value to be confirmed, typically 0.1-0.3 N/cm²)
Prepare tools: hex wrench set, torque wrench, multimeter, megohmmeter, micrometer, magnifying glass, anhydrous ethanol, non-woven cloth, insulating tape
Confirm working environment: vessel drydocked or Azipod pod locked, steering module de-energized and tagged (LOTO), work space well-ventilated and illuminated
Read the slipring replacement section in the Azipod maintenance manual, follow all safety procedures

Safety Precautions:

Slipring replacement must only be performed after the Azipod system is fully de-energized, steering mechanism locked, and "Do Not Operate" tags (LOTO) applied
Residual voltage may exist inside the steering module; verify all circuits are voltage-free with a multimeter before work
Steering module has confined space; protect head and hands, use appropriate lighting
Sliprings and brushes are precision components; avoid touching working surfaces with bare hands (skin oils and salts cause poor contact and corrosion), wear clean cotton gloves when necessary
Prevent metal tools, screws, washers and other foreign objects from falling into the steering module; inventory tools and parts before and after work
No smoking or open flames in work area; oil mist may be present in steering module
Use safety harness and proper work platform for work at height
Comply with vessel electrical work safety regulations and all safety requirements in the ABB Azipod maintenance manual

Old Slipring Removal Steps:

Confirm Azipod pod locked at safe angle, steering module de-energized and tagged
Open slipring compartment access cover in steering module, clean surrounding dust and oil
Photograph old slipring installation position, wiring method, brush arrangement and insulation structure for reassembly reference
Mark each cable's connection position and wire number with labels or marker
Disconnect cables from slipring terminals, insulate cable ends with insulating tape to prevent short circuit
Remove carbon brush assembly: first lift brushes (withdraw from holders or use special tool), then remove brush holder fixing bolts and take out entire assembly
Inspect old slipring surface: use magnifying glass to observe wear, measure wear depth (micrometer multi-point thickness measurement), record wear amount and surface condition (grooves, electrical erosion, oxidation, discoloration) for failure analysis and maintenance records
Remove slipring fixing bolts or lock nuts, take old slipring off shaft, save keys, washers, lock washers and other small parts
Clean shaft and mounting surface: use anhydrous ethanol and non-woven cloth to clean shaft mating surface, insulation surface and mounting flange, remove oil, carbon dust and metal debris
Check shaft insulation resistance: measure insulation between shaft and hull ground with megohmmeter, confirm good insulation (reference ≥100MΩ @ 500VDC, specific value to be confirmed)

New Slipring Installation Steps:

Inspect new slipring: confirm material no. 3AFV98777773, good appearance, correct dimensions, no surface damage; clean working surface and terminals with anhydrous ethanol to remove anti-rust oil and protective film
Install new slipring on shaft, align keyway (if any), terminal lug orientation should match old part (per removal photos)
Install fixing bolts or lock nuts, tighten to specified torque (torque value to be confirmed, reference M6 bolts 4-6 Nm, M8 bolts 8-12 Nm, per manual), ensure slipring coaxial with shaft, no wobble
Install insulation bushings and separators (for multi-ring stacking), confirm good insulation between rings, no metal debris bridging
Re-measure insulation resistance between rings and ring-to-ground, confirm good insulation
Install carbon brush assembly: first install and fix brush holders, confirm correct position and alignment with slipring; then insert brushes into holders, confirm brushes slide freely without jamming, brush arc surface fits slipring well
Check brush pressure: use spring scale or pressure gauge to measure brush-to-slipring pressure, confirm within specified range (to be confirmed), uniform pressure across all brushes
Connect cables: connect cables to slipring terminals per markings, tighten terminal screws, confirm good contact, no loose connection; cable routing neat, no interference with rotating parts
Manual barring: slowly rotate pod (or shaft) by hand several turns, observe slipring-brush contact, confirm no jamming, no abnormal friction sound, normal brush bouncing, no slipring runout
Electrical test: measure circuit continuity with multimeter, confirm correct wiring; measure circuit-to-ground insulation with megohmmeter, confirm qualified insulation
Clean work area: remove carbon dust, metal debris, tools, confirm no foreign objects left
Install access cover, tighten cover bolts to specified torque, confirm good seal
Remove LOTO tags, restore power

Commissioning and Operational Inspection:

Low-speed trial run: operate Azipod system in low-speed steering mode, observe for abnormal sound, sparking or odor in slipring compartment
Infrared temperature measurement: after running for a period, measure slipring and brush temperature with infrared thermometer, confirm normal temperature rise (reference ≤40K, specific limit to be confirmed), uniform temperature at all points, no local overheating
Spark observation: observe sparking at brush-slipring contact in low-light environment, normal should be faint uniform small sparks, no strong sparks or continuous arcing
Voltage drop measurement: measure voltage drop at slipring-brush contact under load, confirm low and stable contact resistance (reference ≤50mV @ rated current, specific value to be confirmed)
Full azimuth test: control Azipod pod for 360° full rotation (clockwise and counterclockwise several times), confirm normal auxiliary power at any angle, no voltage fluctuation or interruption
Full load test: monitor slipring system temperature, current and voltage under normal vessel operating conditions, confirm all parameters within normal range
Record operational data: record installation date, slipring serial number, measurement data (insulation resistance, contact resistance, temperature rise, brush pressure) in vessel maintenance log

Usage and Maintenance Notes:

Slipring-brush system is a wear pair, requires regular inspection and maintenance; recommend checking brush length and slipring surface every 3-6 months (specific cycle per Azipod maintenance manual)
Carbon brushes must be replaced when worn to limit length, avoid brush holder directly rubbing slipring causing severe damage
For slight oxidation or dirt on slipring surface, gently wipe with anhydrous ethanol-moistened non-woven cloth; NEVER use sandpaper, files or other hard objects to polish slipring surface
When slipring surface shows severe wear grooves (depth >0.5mm), electrical erosion pits, cracks or deformation, replace slipring
Keep slipring compartment clean, prevent carbon dust, oil and moisture accumulation; excessive carbon dust may cause inter-ring leakage or short circuit
Avoid using corrosive cleaners in slipring compartment, prevent damage to insulation and metal surfaces
Recommend replacing carbon brushes when replacing sliprings; mixing old and new brushes may cause poor contact and uneven wear
Different batches of brushes may have slight material differences, use same batch brushes whenever possible
Store sliprings in original packaging, in dry, cool, corrosive-gas-free environment, avoid heavy pressure and collision
Before using long-stored sliprings, check surface for oxidation or rust, clean with anhydrous ethanol if necessary
Sliprings are precision electrical components; do not arbitrarily disassemble, modify or substitute with non-original parts
When slipring system abnormalities (overheating, strong sparking, abnormal noise, power fluctuation) are found, immediately reduce load and arrange inspection, avoid fault escalation

Troubleshooting Guide:

表格

Fault Symptom	Possible Cause	Remedy
Slipring surface overheating	Excessive brush pressure, high contact resistance, overload, poor lubrication	Check/adjust brush pressure, clean slipring surface, check load current, replace worn brushes
Strong sparking/arcing	Poor brush contact, broken brushes, rough slipring surface, overload, uneven pressure	Replace brushes, clean/replace slipring, adjust brush pressure, check load
Auxiliary power voltage fluctuation	High contact resistance, brushes worn to limit, loose wiring, slipring runout	Replace brushes, tighten wiring, check slipring concentricity, clean slipring surface
Rapid brush wear	Mismatched brush material, excessive pressure, rough slipring surface, overload, harsh environment	Replace original brushes, adjust pressure, clean/replace slipring, improve environment
Inter-ring leakage/short circuit	Carbon dust accumulation, moisture in insulation, insulation damage, metal foreign objects	Clean carbon dust, dry treatment, inspect/replace insulation, remove foreign objects
Slipring surface grooves	Hard particles in brushes, long-term wear, brush holder misalignment	Replace brushes, replace severely worn slipring, adjust brush holder alignment
Abnormal noise	Brush jamming, loose brush holder, slipring runout, bearing issue	Inspect/replace brushes, tighten brush holder, check slipring installation, inspect bearing

7. Why Choose Us

Professional Marine Spare Parts Channel, Quality Guaranteed — All Azipod system spare parts are obtained through professional marine procurement channels, ensuring genuine ABB original spare parts with product identification and packaging, 12-month quality warranty. Appearance inspection, material number verification, dimension check and packaging inspection performed before shipment, ensuring delivered spare parts are intact and model-accurate.
Global Marine Logistics, Emergency Spare Parts Rapid Response — Supports DHL, FedEx, UPS and other international couriers, can arrange delivery to major ports and shipyards worldwide, supports emergency spare parts air freight expedite. For vessel emergency repair in port, can coordinate fastest logistics solution to reduce vessel detention time. Professional shock-proof moisture-proof packaging ensures safe transportation of precision electrical spare parts.
Azipod System Professional Technical Support — Provides Azipod propulsion system spare part selection consultation (confirming slipring model, applicable unit, matching brush specification), installation guidance (slipring removal/installation steps, brush pressure adjustment, insulation testing), commissioning support (temperature rise monitoring, spark observation, contact resistance measurement), fault diagnosis (overheating, sparking, power fluctuation cause analysis) and maintenance cycle recommendations, helping crew and maintenance personnel correctly install and maintain slipring systems.
Fleet Spare Parts Packages and Framework Agreements — Supports single-vessel spare part procurement and fleet bulk spare part package supply, can customize recommended spare parts list (sliprings, brushes, brush holders, sensors, control modules, etc.) based on Azipod fleet size and operating cycle, provides annual spare parts framework agreements and pricing discounts, helping shipowners and ship management companies optimize spare parts inventory and procurement cost.
Pre-shipment Inspection and Factory Verification — Appearance inspection, dimension measurement (O.D. 130mm, I.D. 119.5mm, thickness 3mm), material number verification, packaging verification performed before shipment; insulation resistance test and surface quality inspection report can be provided if necessary, ensuring delivered spare parts are model-accurate and quality-qualified.

8. Frequently Asked Questions (FAQ)

Q1: What is this 3AFV98777773 product? Where is it used? A: The 3AFV98777773 is an Auxiliary Power Slipring (AUX POWER SLIPRING / B) for ABB Azipod® podded electric propulsion systems, manufactured by ABB Oy, Marine Finland.

Basic Product Information:

Material No.: 3AFV98777773
Name: AUX POWER SLIPRING / B
Applicable Model: AZIPOD 17...25 CS, ZRDA
Dimensions: O.D. Ø130mm, I.D. Ø119.5mm, thickness 3mm
Material: Copper alloy (golden annular ring with terminal lug)

Where is it used:

Installed inside the Steering Module of the Azipod pod propulsion system
Mounted coaxially with the rotating shaft, paired with carbon brushes
Multiple sliprings typically stacked to form a slipring assembly, transmitting different auxiliary power circuits

What does it do:

The Azipod pod must rotate 360° full azimuth relative to the hull; fixed cables cannot follow the rotation
The slipring-and-brush mechanism, through sliding contact, continuously transmits auxiliary power from the fixed hull to the rotating pod during rotation
Auxiliary power includes: propulsion motor cooling system, steering control mechanism, monitoring sensors, heating/dehumidification, lighting/ventilation and other auxiliary circuits within the pod
Ensures continuous auxiliary power supply to the pod at any rotation angle

Simply put: This is like a "rotating power connector." The Azipod pod rotates 360 degrees, and wires can't twist with it, so this copper ring (slipring) plus carbon brushes conducts power while rotating, sending electricity from the ship into the rotating pod for cooling, control, monitoring and other auxiliary equipment. This is specifically for 17-25MW class large Azipod pods.

Q2: What is the relationship between slipring and carbon brush? Do they need to be purchased together? How often should brushes be replaced?

A: Sliprings and carbon brushes are a paired friction set, both essential. The slipring is the rotating conductive ring; the carbon brush is the stationary sliding contact; they achieve rotary conduction through sliding contact.

Relationship between the two:

Slipring: Mounted on the rotating shaft, rotates with the pod, is the conductive annular component (this product is the slipring)
Carbon Brush: Mounted in a stationary brush holder, pressed against the slipring surface by spring pressure, is the stationary conductive contact
During operation, the slipring rotates, the brush is stationary, forming sliding electrical contact between them; current flows from brush → slipring → terminal → pod interior (or reverse)
Both sliprings and brushes are wear items, gradually wearing out from long-term friction

Do they need to be purchased together?

Sliprings and brushes are separate independent spare parts with 各自 material numbers, must be ordered separately
When replacing the slipring, it is strongly recommended to replace brushes at the same time, because:
1. Old brushes have worn contact surfaces matched to the old slipring's curvature; new slipring has different surface curvature and roughness, causing poor contact with old brushes
2. Old brushes may already have wear, chipping or material aging, and pairing with new slipring may cause abnormal wear and sparking
3. Mixing old and new may cause uneven wear and unstable contact resistance
Replacing only brushes without replacing the slipring is acceptable (brushes wear faster than sliprings, usually replaced more frequently)
Recommend confirming matching brush material number and specifications when purchasing, order together

How often should brushes be replaced?

Brush replacement cycle depends on operating hours, current load, environmental conditions, maintenance quality and other factors, no fixed universal cycle
General reference:
- Under normal conditions, brush service life approximately 5000-15000 hours (to be confirmed, per Azipod maintenance manual)
- Recommend checking brush length and condition every 3-6 months
- Brushes must be replaced when worn to 1/2 to 2/3 of original length (or to wear mark line)
- Replace immediately if brush chipping, severe overheating, strong sparking or abnormal wear occurs
Factors affecting brush life:
- Higher current = faster wear
- Rougher slipring surface = faster wear
- Excessive or insufficient brush pressure accelerates wear
- More carbon dust, oil, moisture in environment accelerates wear
- High vibration conditions accelerate wear
Recommendation: Follow the inspection cycle specified in the Azipod maintenance manual, decide replacement time based on actual wear condition, don't rigidly apply fixed cycles. Stock sufficient brush spare parts as brushes are high-frequency replacement items.

Q3: How to determine when a slipring needs replacement? What is the slipring service life? What are the consequences of not replacing?

A: Slipring replacement is determined primarily by surface wear condition, contact resistance and temperature rise measurement, not by a fixed time period. Slipring service life is typically longer than brushes, but may fail prematurely under harsh conditions.

Criteria for determining slipring replacement:

Wear amount exceeds limit:
- Measure thickness at multiple points on slipring working surface with micrometer, compare with original thickness (3mm)
- Radial wear depth exceeds 0.3-0.5mm (to be confirmed, per manual) → recommend replacement
- Surface shows obvious annular grooves (worn by brushes), depth exceeds 1/3 of brush width
Severe surface damage:
- Electrical erosion pits: dense small pits or pitting on surface (caused by spark discharge)
- Oxidation/discoloration: severe oxidation layer, blackening, bluing or abnormal discoloration
- Scratches/galling: deep scratches, galling marks (caused by hard particles in brushes or foreign objects)
- Cracks/deformation: ring body cracks, deformation or out-of-round
- Copper layer peeling: surface copper layer flaking, peeling or substrate exposure
Electrical performance degradation:
- Contact resistance significantly increases: contact voltage drop at slipring-brush under load increases >50% vs new condition
- Power supply voltage fluctuation: intermittent voltage fluctuation or drop in auxiliary power
- Inter-ring insulation decreases: megohmmeter shows significantly reduced insulation between rings or to ground
- Leakage/short circuit: carbon dust accumulation causes inter-ring leakage, even short circuit
Abnormal temperature rise:
- During operation, measure slipring and brush temperature with infrared thermometer, temperature rise exceeds 40-50K (to be confirmed)
- Local hot spots: one area of slipring surface significantly hotter than others (caused by poor contact)
- Accompanied by odor or smoking
Strong sparking:
- Normal operation should have faint uniform small sparks at brush-slipring contact
- Strong continuous sparks, arcing or large sparks indicate severe poor contact
- Observed in low-light environment, sparks appear red/yellow and continuous

What is the slipring service life?

Slipring service life depends on operating hours, current load, brush quality, maintenance level, environmental conditions
General reference: Under normal conditions and good maintenance, slipring life approximately 10000-30000 hours (to be confirmed, based on actual wear)
Sliprings are typically inspected and replaced as needed during the Azipod pod's overhaul cycle (usually 5-10 years or specified operating hours)
Careful maintenance (regular cleaning, timely brush replacement, pressure adjustment) significantly extends slipring life
Harsh conditions (high humidity, salt spray, high vibration, overload) greatly shorten life

Consequences of not replacing:

Auxiliary power interruption: Severe wear or poor contact may cause intermittent or complete auxiliary power loss
Pod function limitation: Auxiliary power interruption may cause cooling system, steering control, monitoring instruments to fail, in severe cases pod cannot steer normally or must run at reduced power
Fire risk: Poor contact causes overheating and strong sparking, may ignite surrounding oil mist or insulation materials, fire hazard
Complete slipring destruction: Continued operation may cause severe surface burning, brush melting, brush holder damage, greatly increasing repair cost
Vessel safety risk: Azipod propulsion failure may affect vessel maneuverability, safety risk in confined waters, port approaches or adverse sea conditions
Unplanned downtime: Failure forces vessel into drydock for repair, incurring huge detention fees, repair costs and operational losses
Consequential damage: Overvoltage or overheating from slipring failure may damage sensitive electronic equipment and control modules inside the pod

Recommendation: Inspect regularly per maintenance manual, replace promptly when wear exceeds limit or performance degrades, don't run with faults. For high-value vessels (e.g., cruise ships), recommend preventive slipring and brush replacement during drydock overhaul.

Q4: What are the dimensions of this slipring? How to install it? What tools are needed?

A: Slipring dimensions and installation information:

Dimension Parameters:

Outer Diameter (O.D.): Ø130 mm
Inner Diameter (I.D.): Ø119.5 mm
Thickness: 3 mm
Structure: Flat annular ring with one terminal lug
Material: Copper alloy

Installation Position:

Installed on the rotating shaft inside the Azipod steering module, coaxial with shaft
Slipring plane perpendicular to shaft axis
Multiple sliprings can be stacked axially to form multi-circuit slipring assembly
Carbon brushes press on slipring working surface from radial or axial direction

Installation Steps (summary, detailed steps per Azipod maintenance manual):

De-energize, tag (LOTO), lock pod steering mechanism
Open steering module slipring compartment access cover
Photograph old part installation state and wiring
Disconnect cables, remove brush assembly, remove old slipring
Clean shaft and mounting surface, inspect insulation
Install new slipring, align keyway and terminal orientation
Tighten fixing bolts to specified torque
Install brush assembly, adjust brush pressure
Connect cables, confirm correct wiring
Manual barring check, confirm no jamming
Electrical test (continuity, insulation)
Clean, reinstall cover, restore power
Low-speed trial run, temperature rise monitoring, full azimuth test

Required Tools:

Hex wrench set (metric)
Torque wrench (small range, 0-20 Nm)
Multimeter (voltage, resistance, continuity)
Megohmmeter/insulation tester (500V or 1000V)
Micrometer (slipring thickness and wear measurement, 0-25mm)
Infrared thermometer (temperature rise monitoring during operation)
Spring scale/pressure gauge (brush pressure measurement)
Magnifying glass or borescope (slipring surface detail inspection)
Anhydrous ethanol (analytical grade) and non-woven/lint-free cloth (cleaning)
Insulating tape (temporary cable end insulation)
Label paper and marker (cable and part marking)
Flashlight/headlamp (compartment lighting)
Clean cotton gloves (avoid hand contact with slipring surface)
Parts tray (store screws, washers and other small parts)
Vacuum cleaner or brush (carbon dust cleaning)

Installation Notes:

Never touch slipring working surface with bare hands; oils and perspiration cause poor contact
Never use sandpaper, files or other hard objects to polish slipring surface
Fixing bolts must be tightened to specified torque; too loose causes slipring wobble, too tight may damage threads or slipring
Brush pressure must be uniform, pressure difference across brushes within specified value
Terminal screws must be tightened; loose connection causes overheating and sparking
After installation, must manually bar to confirm no interference before power-on test
After first power-on, run at low speed first, confirm no abnormality before gradually increasing load
Record all measurement data (insulation resistance, contact resistance, temperature rise, brush pressure) in maintenance log

Q5: Is this product in stock? What is the lead time? What is the price?

A: This model is currently in Order Available status. Azipod system spare parts are specialized marine spare parts with relatively niche usage, inventory fluctuates with market.

Lead time: Standard lead time 4-8 weeks (ordered through professional marine procurement channels or allocated from global inventory). If ABB Finland factory production scheduling or special approval is required, lead time may be extended, specific subject to formal quotation confirmation.
Price: Specific price subject to our formal quotation, depends on purchase quantity, supply channel, whether technical services and logistics solutions are included. Azipod system dedicated spare parts are high-value marine spare parts. Please indicate required quantity, vessel name, Azipod model, desired delivery time and destination port when inquiring; we will coordinate optimal price and delivery solution.
Expedited service: For urgent needs (e.g., vessel in-port emergency repair, tight drydock overhaul schedule), we can try to coordinate global stock inventory or air freight expedite, specific please contact sales team.
Recommendation: For Azipod fleets, recommend planning spare parts procurement in advance, confirming spare parts list and placing orders 3-6 months before drydock overhaul to avoid schedule impact from lead time. Critical spares (sliprings, brushes, control modules) recommend maintaining safety stock.

Q6: How to clean a dirty slipring surface? Can sandpaper be used? How to clean carbon dust?

A: Slipring surface cleaning and maintenance is key to extending slipring life; proper cleaning methods are very important.

Cleaning method for slight surface dirt:

De-energize and tag: Before cleaning, confirm slipring system de-energized, pod locked, follow LOTO procedures
Prepare materials: Anhydrous ethanol (analytical grade, purity ≥99.7%), non-woven or lint-free cloth (lint-free), cotton swabs (small area cleaning), clean cotton gloves
Cleaning operation:
- Wear clean cotton gloves, avoid direct hand contact with slipring surface
- Moisten non-woven cloth with anhydrous ethanol (not dripping wet)
- Gently wipe working surface along slipring circumference to remove oil, oxidation and slight carbon dust
- For terminals and gaps, use ethanol-moistened cotton swabs
- Replace with clean non-woven cloth, wipe repeatedly until no black stains on cloth
- After cleaning, wait for ethanol to fully evaporate (approx. 1-2 minutes) before installing brushes and powering on
Inspection: After cleaning, inspect surface with magnifying glass, confirm no residual fibers, no oil, no scratches

Absolutely prohibited operations:

❌ Never use sandpaper, emery cloth, files to polish slipring surface — destroys surface finish, leaves scratches and abrasive particles, accelerates brush wear, causes poor contact and sparking
❌ Never use wire brushes, metal scrapers or other hard objects to scrape — scratches copper alloy surface, causing irreversible damage
❌ Never use gasoline, diesel, acetone, thinner or other organic solvents for cleaning — may damage insulation, seals and coatings, and are flammable/explosive
❌ Never use ordinary rags, paper towels, old cloth for wiping — leaves fibers and lint, causing poor contact
❌ Never clean while energized — electric shock and short circuit risk
❌ Never touch cleaned surface with bare hands — skin oils and perspiration contaminate surface, causing oxidation and poor contact

Carbon dust cleaning method:

Carbon dust from brush wear is the main contaminant in slipring compartment; excessive accumulation may cause inter-ring leakage, short circuit and insulation degradation
Cleaning tools:
- Vacuum cleaner (with small nozzle, HEPA filter preferred) — most effective, avoids carbon dust flying
- Soft brush (natural bristle, anti-static) — used with vacuum cleaner to brush carbon dust from gaps
- Compressed air (low pressure, ≤0.2MPa, in well-ventilated area) — blows carbon dust from gaps, but causes dust flying, not recommended in enclosed compartment
Cleaning steps:
1. First remove brush assembly, take brushes out of holders
2. Use vacuum cleaner to suction carbon dust from slipring surface, brush holders, insulation separators and compartment walls
3. Use soft brush to gently brush carbon dust from gaps and dead corners, simultaneously vacuuming
4. Wipe slipring surface and insulation parts with ethanol-moistened non-woven cloth to remove residual carbon dust
5. Clean inside of brush holders and brush surfaces (brushes can be lightly wiped with clean non-woven cloth, never liquid-clean brushes)
6. Check compartment drain holes (if any) are clear, prevent water accumulation
7. After cleaning, measure inter-ring and ground insulation resistance, confirm insulation restored
Cleaning cycle: Recommend cleaning carbon dust every 3-6 months (per maintenance manual), increase frequency under high load or dusty conditions

Slipring surface oxidation treatment:

Slight oxidation (surface dull, no luster): wipe repeatedly with anhydrous ethanol to remove
More severe oxidation (surface oxidation layer, increased contact resistance):
- Can use special slipring cleaning eraser (fiberglass eraser, not ordinary eraser) to gently wipe oxidation layer, then clean with ethanol
- Or use 0000 grade (extra fine) steel wool (note: not wire brush!) to gently wipe along circumference, then immediately and thoroughly clean with ethanol to prevent steel wool debris residue
- Above operations require great caution; excessive wiping damages surface
Severe oxidation, electrical erosion or wear: replace slipring directly, do not attempt repair

Routine maintenance recommendations:

Check slipring surface cleanliness each time brushes are inspected
Keep slipring compartment well-sealed, prevent external dust and moisture entry
Clean carbon dust promptly when found, don't wait for heavy accumulation
Always measure insulation resistance after cleaning to confirm effectiveness
Record date and condition of each cleaning, establish maintenance log。

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