Since there are three terminals – S, C, R –in a single phase motor, measure winding resistance:Ĭ to S, C to R and S to R. Check that the correct voltage is applied to the motor.Ĭheck the motor winding resistance or ohms reading with a multimeter. Any value greater 0.5 ohms indicate trouble with the motor.įor single phase motors, the expected voltage is about 230V or 208V depending whether you are using the UK or America voltage system. A good motor should read less than 0.5 ohms. With a multimeter, measure the resistance between motor frame (body) and earth. (3) As with all testing and inspections, the motor name plate provides valuable information that will help to ascertain the true health of the motor. If shaft rotation is free and smooth, bearing is possibly in good condition, otherwise consider replacing. Look out for smooth and free shaft rotation. (2) Manually rotate motor shaft to examine bearing condition. Check for burnt, damage to body or cooling fan or shaft.
For the single phase motor, do the following:
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