How Do You Test An Electric Motor

It measures the same or similar to the voltage you noted from the label on the electric motor if power is reaching the motor.

How do you test an electric motor.

If you have a reading and your motor isn t operating it s certain the motor is the problem and needs replacing. Test for direct shorts in the motor s power windings in induction non brush type motors. Additionally along with these tests you will also have to test your voltage contacts contact check terminal check etc. Check that the correct voltage is applied to the motor.

Since the motor is turning freely it won t do any good to lubricate the bearings and since the capacitor checks out and the motor is humming it means you ve got voltage to the terminals. The megger will help to detect areas of deteriorating insulation where the windings may soon short. You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. Ac motor winding resistance test check the motor winding resistance or ohms reading with a multimeter.

Even though you may have to do a bit of work by splitting the coupling this test will really help you to find out if the motor is bad or good since it is not usual for a bad motor to run off load. Check the multimeter measurement. The only thing you can check is that you ve got the proper line voltage with a heavy load such as the humming motor connected. Knowledge of the basics together with powerful new test equipment vastly simplifies the job.

Do the following with the motor disconnected. Since there are three terminals. Keep the multi meter set for 30 000 ohms and touch one test lead to one terminal and the other to another terminal. Testing electric motors doesn t have to be a mystery.

With a multimeter set to low ohms usually 200 test between each winding terminal and the metal casing of the motor. Electric motors have had a reputation for being a mix of science and magic. So when a motor fails to operate it may not be obvious what the problem is. Most repair shops will use a megger or a ground insulation tester.