How Do You Load Test An Electric Motor

Keep the multi meter set for 30 000 ohms and touch one test lead to one terminal and the other to another terminal.

How do you load test an electric motor. Testing electric motors doesn t have to be a mystery. When an electric motor is broken one suspect is the fiel coild of the motor stator. Reasons to determine motor loading most electric motors are designed to run at 50 to 100 of rated load. It s possible the problem could be the wring or the power source and not the electric motor.

Another possibility is that the driven load is jammed binding or mismatched. 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. Peak efficiency is at 7 5 hp. Knowledge of the basics together with powerful new test equipment vastly simplifies the job.

Look at the label on the electric motor to determine the voltage it needs to operate. Deviations from rated fla could signify problems with the motor under test. A motor s efficiency tends to decrease dramatically below about 50 load. If there is any reading on any of these then the motor is bad do not use it.

However if you re motor isn t working use a multimeter to test it before deciding to replace it. Check c to e s to e r to e. So when a motor fails to operate it may not be obvious what the problem is. Maximum efficiency is usually near 75 of rated load.

Do the following with the motor disconnected. Electric motors have had a reputation for being a mix of science and magic. Thus a 10 horsepower hp motor has an acceptable load range of 5 to 10 hp. In this video we show different tests balancing test continuity coil.

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. You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. With a multimeter set to low ohms usually 200 test between each winding terminal and the metal casing of the motor.