How Do You Load Test An Electric Motor

Deviations from rated fla could signify problems with the motor under test.

How do you load test an electric motor.

Test for direct shorts in the motor s power windings in induction non brush type motors. Minimum test value for a good electric motor is at least 1mω running amps test with the motor running check the full load amps fla with a suitable meter or preferably a clamp on meter and compare with the motor name plate fla. However if you re motor isn t working use a multimeter to test it before deciding to replace it. Peak efficiency is at 7 5 hp.

It s possible the problem could be the wring or the power source and not the electric motor. Look at the label on the electric motor to determine the voltage it needs to operate. In this video we show different tests balancing test continuity coil. Knowledge of the basics together with powerful new test equipment vastly simplifies the job.

You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. Reasons to determine motor loading most electric motors are designed to run at 50 to 100 of rated load. Check c to e s to e r to e. If there is any reading on any of these then the motor is bad do not use it.

Keep the multi meter set for 30 000 ohms and touch one test lead to one terminal and the other to another terminal. Another possibility is that the driven load is jammed binding or mismatched. Electric motors have had a reputation for being a mix of science and magic. Additionally along with these tests you will also have to test your voltage contacts contact check terminal check etc.

A motor s efficiency tends to decrease dramatically below about 50 load. Thus a 10 horsepower hp motor has an acceptable load range of 5 to 10 hp. Do the following with the motor disconnected. So when a motor fails to operate it may not be obvious what the problem is.

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. Sometimes the trouble lies within the power supply including branch circuit conductors or motor controller. Maximum efficiency is usually near 75 of rated load. When an electric motor is broken one suspect is the fiel coild of the motor stator.