How Do You Test An Electric Motor With A Multimeter

Small universal motors as for portable electric drills may contain extensive circuitry including a switch and brushes.

How do you test an electric motor with a multimeter.

If there is any reading on any of these then the motor is bad do not use it. Turn on the multimeter. Values measured in this phase of testing should be around fifteen ohms. You will now place the red probe on the common wire.

Ensure it is set to measure volts as multimeters. 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. Measured value s to r should be c to s c to r. In the ohmmeter mode connect the meter to the plug and monitor the resistance as you wiggle the cord where it enters the enclosure.

Ac motor winding resistance test check the motor winding resistance or ohms reading with a multimeter. Test the fourth set of wires. C to s c to r and s to r. For generally testing of induction motor we perform three test 1 continuity test 2 short circuit test ground test in continuity test we the resistance of the.

You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. Do the following with the motor disconnected. Most repair shops will use a megger or a ground insulation tester. In this video we show different tests balancing test continuity coil.

Since there are three terminals s c r in a single phase motor measure winding resistance. You need to check if electricity is getting to the motor. 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. 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.

Turn on the power unit that supplies electricity to the electric motor. The megger will help to detect areas of deteriorating insulation where the windings may soon short. The most common failure mode of a 3 phase ac motor is burnt winding or shorted winding leading to the damage of the motor. Keep the multi meter set for 30 000 ohms and touch one test lead to one terminal and the other to another terminal.

Each of the sets of windings should read about the same ohms value.