How To Test An Electric Motor

Test for direct shorts in the motor s power windings in induction non brush type motors.

How to test an electric motor.

Another possibility is that the driven load is jammed binding or mismatched. 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. Check the multimeter measurement. Set the voltage setting of the insulation resistance tester to 500v and check motor windings to earth.

Turn the rotors and push and pull the shaft to test the bearings. It measures the same or similar to the voltage you noted from the label on the electric motor if power is reaching the motor. Most repair shops will use a megger or a ground insulation tester. In this video we show different tests 180 degrees test bar to.

Keep the multi meter set for 30 000 ohms and touch one test lead to one terminal and the other to another terminal. Check c to e s to e r to e. 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. Sometimes the trouble lies within the power supply including branch circuit conductors or motor controller.

If the rotors move smoothly and there is little. If you have a reading and your motor isn t operating it s certain the motor is the problem and needs replacing. The megger will help to detect areas of deteriorating insulation where the windings may soon short.