How To Test An Electric Motor

Test electric motor windings when a bad motor winding cannot be found by a physical inspection many times an ohmmeter may show that there is a defective winding.

How to test an electric motor.

Sometimes the trouble lies within the power supply including branch circuit conductors or motor controller. When an electric motor fails to start runs intermittently runs hot or continually trips its overcurrent device there my be a variety of causes. When an electric motor is broken one suspect is the armature with commutator of the motor. Most repair shops will use a megger or a ground insulation tester.

The megger will help to detect areas of deteriorating insulation where the windings may soon short. To check an electric motor to see why it failed look at the outside for signs of debris that has been sucked into the motor windings as well as broken mounting holes or feet and darkened paint that could indicate excessive heat. Keep the multi meter set for 30 000 ohms and touch one test lead to one terminal and the other to another terminal. In this video we show different tests 180 degrees test bar to.

If you have a reading and your motor isn t operating it s certain the motor is the problem and needs replacing. Set the voltage setting of the insulation resistance tester to 500v and check motor windings to earth. It measures the same or similar to the voltage you noted from the label on the electric motor if power is reaching the motor. Check c to e s to e r to e.

Check the multimeter measurement. If the rotors move smoothly and there is little. Turn the rotors and push and pull the shaft to test the bearings.