Electric motors are essential for nearly all kinds of electrical items namely fans, pumps etc. Motors are used in all kinds of heavy machineries and vehicles etc. the smallest of the electric motors are used in the wrist watches, those of medium sizes are used in the industrial usages and the largest of the motors are used in the ships as propellers and airplanes etc. these electric motors can be of single phase or double phase. The single phase motors are comparatively less powerful and are not fit for heavy works. Â
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