Frequent question: How do you maintain a DC motor?

How do you clean a DC motor?

Care should be taken when cleaning, as sweeping particulates further into the motor unit can worsen the condition. Proper cleaning involves vacuuming dry particulates with a soft bristle brush to loosen the accumulated dust. A cloth, moistened with solvent, helps to remove oily dirt.

How do you maintain a motor?

Every 6 months

  1. Clean motor, blowing out dirt from windings, and wipe commutator and brushes.
  2. Visually inspect commutator clamping ring.
  3. Check and replace brushes that are more than half worn.
  4. Examine brush holders, and clean them if dirty.
  5. Check brush pressure and position.

How do you inspect a DC motor?


  1. Disconnect the power source from the DC motor. You should expose the bare wire leads that conduct the electrical power into the motor.
  2. Remove the DC motor from any mechanical attachment to the machine with the end wrench set. …
  3. Rotate the motor shaft very slowly in either direction.

How can a DC motor be avoided in a short circuit?

Short-circuit protection is in- corporated into a motor contactor with “high-breaking-capacity fuses” or a circuit breaker with “instantaneous at- tracted armature-type relays.” Ground fault relays or interrupters are another type of overcurrent protection.

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What is in a DC motor?

A DC motor consists of an stator, an armature, a rotor and a commutator with brushes. Opposite polarity between the two magnetic fields inside the motor cause it to turn. DC motors are the simplest type of motor and are used in household appliances, such as electric razors, and in electric windows in cars.

Why is field deceleration needed in DC motors?

Field Failure Protection

This causes a big increase in armature current, often without a corresponding rise in torque. When a motor is coupled to a load, it might be unable to increase the speed of the load and high currents continue to flow, thus damaging the armature windings.

Can a DC motor be repaired?

DC Motor Repair Time

Let’s face it, there is a lot that can go wrong with a DC motor, but most of it involves fairly straightforward repairs, such as bearing replacement or a simple brush replacement. These repairs won’t take as long as a more complicated repair like an armature or field coil rewind.

How often should a motor be greased?

When the operating temperature is between 80°C – 100°C (176°F – 212°F), oil should be replaced at least every three months. For critical equipment, it is advisable that lubricating oil be analyzed at least every three months to determine when oil replacement is necessary.

Which motor requires more maintenance?

Unlike AC motors, DC motors require much more from a maintenance crew to properly keep running. But how does one quickly spot for problems in a DC motor without tearing it down unnecessarily?

What is the normal operating temperature of an electric motor?

The surface temperature of a continuously (and correctly) operating general purpose industrial electric motor will easily be 80 C (176 F) and perhaps as high as 100 C (212 F).

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