Rewinding a 3-Speed Anchor Winch Motor
Anchor winches are critical pieces of deck machinery on ships. Their reliability directly affects vessel safety during anchoring operations. Many winches are driven by multi-speed motors (commonly 2-speed or 3-speed) to provide controlled anchor handling.
The Rewinding Process
01
Dismantling and Documentation
Inspect bearings, slip rings, and terminal boards.
Disconnect and remove the motor.
Photograph and mark all connections.
02
Core and Winding Removal
Clean the stator thoroughly.
Strip old coils carefully (burnout oven or manual).
Avoid damaging the stator laminations.
03
Recording Original Data
Check slot dimensions for correct insulation thickness.
Note number of turns, pitch, and coil grouping.
Measure conductor cross-section with a micrometer.
04
Rewinding
Follow the original sequence for each speed winding.
Wind new coils with the same gauge copper.
Maintain even tension and tight packing.
Use slot liners, phase insulation, and wedges.
05
Insulation & Varnishing
Ensure varnish penetrates fully for moisture resistance.
Apply marine-grade insulating varnish.
Bake at recommended temperature for curing.
06
Reassembly & Testing
Verify smooth operation before installation back on the winch.
Fit new bearings if required.
Check insulation resistance with a megger (>1 MΩ minimum).
Test no-load currents at all three speeds.
