![]() ![]() ![]() The auxiliary winding is a so-called shading coil consisting of an uninsulated short-circuited copper strip embedded into one of the main poles and spanning about one-third of its pitch. Shaded-pole motors, such as used in fans. ![]() The auxiliary winding is connected only during starting. The auxiliary winding is wound with fewer turns and much smaller size of wire than that of the main winding, so that it has a considerably greater resistance-to-reactance ratio. The auxiliary winding is connected through a capacitor only during starting. 2.Ĭapacitor-start motors, such as used in refrigerators. The auxiliary winding is connected permanently to the supply through a capacitor. In order of decreasing magnitude of developed torque and cost, one may list the following: 1.Ĭapacitor-run motors, such as used to drive the compressors in air-conditioning units. The required phase difference in the currents flowing in the two windings when they are fed from the same voltage is obtained by the different nature of the circuit impedance. In all cases the auxiliary winding is displaced in space from the main winding. ![]()
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