How to Test a Motor with a Multimeter

How to Test a Motor with a Multimeter. Industrial processes have been a source of immense invention for ages. Our forefathers worked hard to seek alternatives to the slow procedures they encountered.

Which eventually led to the development of motors and automation. Electric motors are now used by many businesses to increase the efficiency of their operations.

How to Test a Motor with a Multimeter

While motors have undoubtedly improved corporate operations, organizations must also maintain their engines to minimize outages. You must know how to determine if an electric motor fails to avoid future downtime and inefficiencies. One may take immediate actions early and prevent your engine from breaking down and possibly being harmed if you know how and what to check for in a motor.

If you want to understand more, check out our in-depth tutorial here.

Check the Bearings and Shaft

Bearings are among the most significant typical elements to fail in a motor. Because the directions are subject to normal wear and tear, you will need to replace them throughout the period.

You should inspect the bearings frequently since continuing to operate a motor with worn-out bearings might degrade the mechanism and impair its effectiveness.

Bearings are simple to examine. To guarantee that the bearings spin easily and smoothly, all you have to do is turn them. Pushing and tugging the shaft to which the directions are attached is another approach to inspect the bearings.

The post should move freely, and the paths should revolve smoothly. However, if you hear scraping or sense friction, the directions may need to be replaced. The bearings may only need to be lubricated if the conflict isn’t too bad.

Inspect the Motor Windings With a Multimeter

The windings of such an electric motor remain, obviously, critical to its dynamics. You must examine the windings for excessive wear regularly, but more significantly, you should assess their resistance. To test the windings, you’ll require a multimeter first and primarily.

Turn the multimeter to ohms and check the motor’s wires and terminals first. You should review the windings for a “short to ground” in the circuit, as well as any open or shorts.

To check for a short-to-earth in your motor, switch your multimeter to ohms and remove the motor from the power supply. Then glance over each wire for endless readings.

If you get a reading of 0, you may be dealing with a cable issue. To figure out if a cable is bad, test each one separately and ensure neither of the leads is contacting.

You’ll be able to locate the cable that’s creating the issue if you test each one separately. If each line, on the other hand, gives an endless reading, you have a motor fault and therefore should engage a competent repair shop. You should check the T1 to T2, T2 to T3, and ultimately T1 to T3 windings for open or shorts.

Note that some motors have distinct features, such as U to V, V to W, and W to U; the configuration of your engine may be found in the user guide.

You’re looking for a measurement of.3 to 2 ohms on average. Whether you receive a reading of 0, you should repeat the test to see if you get the same result. A value of 0 indicates that there is a phase deficiency.

Test the Power With a Multimeter

An electric motor is only as good as its power supply. The multimeter you used in the preceding point can test the power supply. According to the type of motor, the process and appropriate ratings for testing power supplies may differ.

Every motor will have a voltage limit that needs to be met, and you’ll need to test the wires to make sure they do. Your user handbook will include all of the necessary information, as well as a guide for power testing.

Sampling the elements of an electric motor may rapidly get intricate, and if you’re not aware of the procedure, it’s simple to make errors.


A basic multimeter can perform a rapid check-out, and there’s a much additional data to gather and weigh before placing it to use. Power is not necessary at any point during the motor check-out.

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