We know the equipment inside out
DC Motor Repairs
For over a century, Mawdsleys has provided DC motor repairs, rewinds, and rebuilds with a level of craftsmanship that few can match. Engineers trust us not just because we work fast—but because we get it right. The first time.
Our knowledge comes from decades of designing and manufacturing DC motors ourselves, which means we understand them better than most. We offer a complete service—from installation and maintenance to full refurbishments—on every make and model. If you need it fixed and you need it now, call the people who do it right. Call us.
Reasons for DC Motor Failure and How to Prevent It
DC motor failure costs time, money, and production. At Mawdsleys, we’ve seen the three main culprits time and time again—and we know how to prevent failure.
– Carbon brush wear: When carbon brushes wear down, they can damage the armature, cause a loss of power from the motor, damage the commutator and cause motor failure.
Prevention: Premature carbon brush wear can be caused by a number of factors and it is important to know which are they. Incorrect installation can cause operational problems with the brushes. Underloading, overloading, winding faults, voltage surges or issues with the commutator can also cause brush wear and motor failure.
– Carbon dust: As brushes wear, they shed dust—fine, abrasive, and dangerous. It causes winding shorts and ultimately motor failure.
Prevention: In order to prevent the build-up of carbon dust, operators should visually inspect and clean the motor regularly, ensure carbon brushes are properly fitted and replaced as required and ensure there is no excessive noise and vibration within the motor.
– Commutator surface wear: Slot bar burning, threading, and grooving are serious risks which can lead to motor failure, rapid carbon brush wear or commutator replacement.
Prevention: Slot burning can be identified by dark and light bars on the commutator surface. Threading can be identified by numerous thread-like thin lines forming on the commutators brush paths; an early indication of threading is dark streaks appearing along the brush path. Grooving can be identified by smooth ‘grooves’ on the commutator’s brush path.
We offer preventative maintenance programs—sending motors to us on a regular schedule for inspection and early fault detection. It’s how smart engineers avoid costly surprises.
The Right Tools. The Right People. The Right Results.
At Mawdsleys, we don’t outsource expertise—we keep it in-house. Our fully equipped workshop in the South West handles full DC motor repairs, rewinds, fault investigations, and complete overhauls of equipment of every type and size. Nationwide.
We stock a wide range of spares and components, so you’re never left waiting. And with decades of experience—we can repair what others can’t.
We also specialise in field coil repairs and the maintenance and manufacturing of motor shafts. Find out more about these below.
Case Studies
This is why
1. Speed of service
Reducing your downtime is our main priority. That’s why, from the moment you call to the final report, we move fast. No delays. Just results.
2. High-quality service
With over 100 years experience, we’ve built a reputation on precision, excellence, and constant improvement. You expect the best—we deliver it.
3. One-stop shop
The vast experience of our staff, combined with our state-of-the-art workshop, provide us with flexibility. We do not only repair – we manufacture.
4. ATEX motors specialists
Repairing all types of ATEX motors. We are an AEMT Ex Registered Repairer recognised for our quality systems and professional repair standards.