How To Test A Small Ac Electric Motor

Most electric motors whether ac or dc fail after time for reasons that may not be electrical in nature.

How to test a small ac electric motor.

In the ohmmeter mode connect the meter to the plug and monitor the resistance as you wiggle the cord where it enters the enclosure. Load to motor may be excessive or unbalanced. Many electric motor failures are caused by bearing failures. Begin to check the bearings of the motor.

The amps may also be high. Small electric motors operate a wide variety of electrical devices such as remote control models children s railroad sets and computers. Make an electric motor run again. Motors without brushes and commutators such as ac alternating current induction motors last the longest because of few moving parts.

Ac motors are fairly basic devices that consist of one or more run windings and one or more start windings. When an electric motor is broken one suspect is the fiel coild of the motor stator. Small universal motors as for portable electric drills may contain extensive circuitry including a switch and brushes. Set the voltage setting of the insulation resistance tester to 500v and check motor windings to earth.

Check the motor load and inspect the drive belt tension to ensure it s not too tight. For defective winding replace the motor. In this video we show different tests balancing test continuity coil. Bearings are located at both ends of the motor which are sometimes called bell housings or end bells.

Check the power supply to make sure voltage is accurate. The bearings allow the shaft or rotor assembly to turn freely and smoothly in the frame. Test the winding for shorted or open circuits. 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.

They generally operate on low voltage electricity 6 to 24 volts and are powered by batteries or a transformer that reduces 110 volts to the required low voltage. At the best the motor may run. Check c to e s to e r to e. Ac and dc brush type motors such as those used in vacuum cleaners and power tools produce high power.