Testing Small Electric Motors

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

Testing small electric motors.

Set your dmm to the ohms function and touch the probes to the terminals on the capacitor. Small universal motors as for portable electric drills may contain extensive circuitry including a switch and brushes. When an electric motor is broken one suspect is the fiel coild of the motor stator. Usually red and black attached to them.

You can do it by multimeter with small manual power generator. Bearings are located at both ends of the motor which are sometimes called bell housings or end bells. This test may take place on installed or on the reel cable tools appliances transformers power distribution subsystems capacitors motors and any type of electrical equipment or wiring. I would like to fulfill more at least with one important point about testing of motors insulation.

Find the two small metal terminals on the electric motor. Turn on the power unit that supplies electricity to the electric motor. Each of the sets of windings should read about the same ohms value. Europe standard at least.

They are near the back and have two colored wires. You need to check if electricity is getting to the motor. Turn on the power unit that supplies electricity to the electric motor. Keep the multi meter set for 30 000 ohms and touch one test lead to one terminal and the other to another terminal.

They are near the back and have two coloured wires. The bearings allow the shaft or rotor assembly to turn freely and smoothly in the frame. Motors in factory producer have to be checked phase to ground 2 un 1000v according en 60 034 1 acc. Many electric motor failures are caused by bearing failures.

Test the capacitor remove one of the wires from the capacitor to test the resistance of the start induction run motor. In the ohmmeter mode connect the meter to the plug and monitor the resistance as you wiggle the cord where it enters the enclosure. If the meter readout indicates 0 resistance the capacitor is shorted out and needs to be replaced. You need to check if electricity is getting to the motor.

Find the two small metal terminals on the electric motor. In this video we show different tests balancing test continuity coil.