single phase motor winding resistance chart

They are more expensive than other types of motors, but they have the highest starting torque per ampere than any other single phase motor. Repulsion motors have largely been replaced by capacitor-start motors. They do not have a service factor and must be operated at their rated load. They are relatively inexpensive and easy to maintain. Shaded-pole motors have a low starting torque and their applications are limited to light-duty loads. They have a high efficiency and a high power factor. They do not require a starting switch and are easy to maintain. They have lower starting torque than the other two types of capacitor motors. Permanent split-capacitor motors are designed so that the capacitor delivers equal values in the start or run cycle. The torque is higher than the split-phase motor in the run condition. A centrifugal switch is used to change the capacitors from the start to run condition. The capacitor used to start the motor is normally an electrolytic. They can carry small overloads continuously and large overloads on an intermittent basis.Ĭapacitor-start, capacitor-run motors have the advantage of the high starting torque of the capacitor-start motor. Their high starting torque requires only a normal starting current. They operate as split-phase motors when up to operating speed.

Starts and stops must not be frequent.Ĭapacitor-start motors are used where the starting load is heavy. If used for other applications, the load should never exceed the horsepower rating of the motor. It should be used only for the load for which it was designed. The special service split-phase motor usually has a service factor of 1. They are used for medium-duty applications where starts and stops are frequent. General purpose motors may be loaded up to their service factor. The split- phase motor is available as a general purpose or special service motor. George Patrick Shultz, in Transformers and Motors, 1989 Summary

Single phase motor winding resistance chart