How Do You Test An Electric Motor With A Multimeter

You need to check if electricity is getting to the motor.

How do you test an electric motor with a multimeter. C to s c to r and s to r. In this video we show different tests balancing test continuity coil. With a multimeter set to low ohms usually 200 test between each winding terminal and the metal casing of the motor. Small universal motors as for portable electric drills may contain extensive circuitry including a switch and brushes.

Keep the multi meter set for 30 000 ohms and touch one test lead to one terminal and the other to another terminal. You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. The megger will help to detect areas of deteriorating insulation where the windings may soon short. Test for direct shorts in the motor s power windings in induction non brush type motors.

Most repair shops will use a megger or a ground insulation tester. Often it is required to test the winding of the 3 phase windings with the aid of a multimeter or ohmmeter to determine whether the motor is still good or burnt or shorted. When an electric motor is broken one suspect is the fiel coild of the motor stator. If there is any reading on any of these then the motor is bad do not use it.

Ac motor winding resistance test check the motor winding resistance or ohms reading with a multimeter. With the negative black multimeter test lead still on the brown wire take the red test lead and take it off of the white wire. You will now place the red probe on the common wire. The most common failure mode of a 3 phase ac motor is burnt winding or shorted winding leading to the damage of the motor.

Turn on the multimeter. Each of the sets of windings should read about the same ohms value. Do the following with the motor disconnected. Test the fourth set of wires.

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. Values measured in this phase of testing should be around fifteen ohms. Ensure it is set to measure volts as multimeters. Turn on the power unit that supplies electricity to the electric motor.

Since there are three terminals s c r in a single phase motor measure winding resistance.