DC Motor Repairs
Over 100 Years of Experience in DC Motor Repairs
Below is a range of common faults and our detailed repair procedures for each
Common Fault and Fix
DC Motor: Stator Rewind
Possible Problems
- Overspinning
- Overcurrent
- Underperforming
- Increased heat
BAWCo Example Repair Procedure
- Detail and strip the windings
- Remove old insulation and clean the core pack
- Insulate slots with the required heat class (Class F or Class H)
- Wind, connect, and test
- Impregnate with varnish, and oven-stove
- Assemble the motor, perform final tests, and run
Each motor is assessed individually, tailoring a repair plan with a full work scope that is specific to each motor. The procedure above is just an example of our typical process.
All repaired motors include Preventive Maintenance to ensure long-term performance
Common Fault and Fix
DC Motor: Armature Rewind
Possible Problems
- Overcurrent
- Underperforming
- Cogging
- Sparking
- Blown
BAWCo Example Repair Procedure
- Detail and strip the windings
- Test the commutator
- Remove old insulation and clean the core pack
- Insulate slots with the required heat class (Class F or Class H)
- Wind and connect wires to the commutator and solder
- Test, impregnate with varnish, and oven-stove
- Skim and undercut the commutator
- Balance the armature to required ISO G Grades
- Perform insulation and voltage drop tests on the armature
- Assemble the motor, perform final tests, and run
Each motor is assessed individually, tailoring a repair plan with a full work scope that is specific to each motor. The procedure above is just an example of our typical process.
All repaired motors include Preventive Maintenance to ensure long-term performance
Common Fault and Fix
DC Motor: Bearing Housing and Surface Repair
Possible Problems
- Excessive noise
- Excessive heat on the endshield or shafts
- Rotor mechanically locked up
- Application wear or damage due to misalignment
BAWCo Example Repair Procedure
- Strip the motor down
- Remove the old bearings
- Measure the shaft and housings for wear – perform engineering work on worn surfaces to bring them back within tolerance
- Fit new bearings
- Assemble the motor, perform final tests, and run
Every motor is assessed individually, tailoring a repair plan with a full work scope that is specific to each motor. The procedure above is just an example of our typical process.
All repaired motors include Preventive Maintenance to ensure long-term performance
Common Fault and Fix
DC Motor: Re-lead Windings
Possible Problems
- Visual inconstancies
- Signs of melting insulation on the leads
- Cracking or discolouration of the leads
- Blown lead
- Unbalanced resistances or open circuit
BAWCo Example Repair Procedure
- Dismantle the motor
- Cut the leads back to the connections
- Test windings in case further action is needed
- Connect new leads and terminate
- Varnish and oven-stove windings
- Assemble the motor, perform final tests, and run
Each motor is assessed individually, tailoring a repair plan with a full work scope that is specific to each motor. The procedure above is just an example of our typical process.
All repaired motors include Preventive Maintenance to ensure long-term performance
Common Fault and Fix
DC Motor: Tacho Repairs
Possible Problems
- No or incorrect feedback from the tachometer
- Excessive noise or vibration
BAWCo Example Repair Procedure
- Dismantle the tacho generator
- Clean and test the armature
- Check magnets for cracks or displacement
- Check bearing housings for wear
- Perform the required repair work
- Assemble the motor, perform final tests, and run
Each motor is assessed individually, tailoring a repair plan with a full work scope that is specific to each motor. The procedure above is just an example of our typical process.
All repaired motors include Preventive Maintenance to ensure long-term performance
Common Fault and Fix
DC Motor: Worn or Bent Drive Shaft
Possible Problems
- Visual inspection
- Measures below tolerance
BAWCo Diagnostic
- Clock the shaft for trueness
- Measure to check the exact size
BAWCo Example Repair Procedure
- Dismantle the motor
- Remove bearings
- Perform engineering work to build the shaft back up and machine it concentric
- Fit new bearings
- Assemble the motor, perform final tests, and run
Each motor is assessed individually, tailoring a repair plan with a full work scope that is specific to each motor. The procedure above is just an example of our typical process.
All repaired motors include Preventive Maintenance to ensure long-term performance
Common Fault and Fix
DC Motor: Broken or Missing Parts
Parts
- Endshields
- Terminal blocks and boxes
- Feet/ Flange mounting points
- Cable glands
- Cooling fans and fan cowls
- Inspection covers
- Taco
BAWCo Replace and Repair
BAWCo stocks and has full access to all Brook Crompton spares for replacements. We also hold a wide range of compatible spares for other motors and can offer repair services if required.
Common Fault and Fix
Force Vent Unit Repair
Possible Problems
- Excessive noise and vibrations
- Poor airflow
- Excessive heat
- Overcurrent
BAWCo Example Repair Procedure
- Dismantle the motor
- Clean the fan and motor
- Test the windings
- Inspect mechanical surfaces
- Replace bearings
- Assemble the unit, perform final tests, and run
Each motor is assessed individually, tailoring a repair plan with a full work scope that is specific to each motor. The procedure above is just an example of our typical process.
All repaired motors include Preventive Maintenance to ensure long-term performance
Contact Us
Get in touch to discuss your DC motor repair
Looking for AC Repairs?
View our repairs page for AC motors
Life Extension
Regular electric motor servicing helps identify developing faults before they cause damage.
Replacing worn bearings and clearing debris from fans and fins improves cooling efficiency and extends the overall lifespan of your motor.
Reduce Downtime from Catastrophic Failures
Have you thought about critical spares?
Not only can we provide repair services for your current motor, but we can also provide and service a spare, so you’re not caught off guard by breakdowns.
24/7 Emergency Call Out
Call 01274 728379 day or night, our engineers are ready to respond to sudden breakdowns.
BAWCo’s fast action reduces costly downtime and ensures your equipment is back in service as soon as possible.