How To Test A Small Ac Electric Motor

Ac motors are fairly basic devices that consist of one or more run windings and one or more start windings.

How to test a small ac electric motor. You have an electric motor designed to run on alternating current but it does not run. Check c to e s to e r to e. Small universal motors as for portable electric drills may contain extensive circuitry including a switch and brushes. Most electric motors whether ac or dc fail after time for reasons that may not be electrical in nature.

Set the voltage setting of the insulation resistance tester to 500v and check motor windings to earth. When an electric motor is broken one suspect is the fiel coild of the motor stator. 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. For defective winding replace the motor.

Bearings are located at both ends of the motor which are sometimes called bell housings or end bells. At the best the motor may run. Make an electric motor run again. In the ohmmeter mode connect the meter to the plug and monitor the resistance as you wiggle the cord where it enters the enclosure.

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. Check the motor load and inspect the drive belt tension to ensure it s not too tight. The amps may also be high. Ac and dc brush type motors such as those used in vacuum cleaners and power tools produce high power.

Small electric motors operate a wide variety of electrical devices such as remote control models children s railroad sets and computers. Test the winding for shorted or open circuits. Load to motor may be excessive or unbalanced. Motors without brushes and commutators such as ac alternating current induction motors last the longest because of few moving parts.

Check the power supply to make sure voltage is accurate. In this video we show different tests balancing test continuity coil. The bearings allow the shaft or rotor assembly to turn freely and smoothly in the frame. Begin to check the bearings of the motor.