One type of capacitor motor is the capacitor run or permanent split capacitor motor. These are used in instances where low starting torque is needed as in air conditioner blower applications.
Permanent split motors found in sizes up to three horsepower are economical and easily customized. This type of motor is similar to the split phase motor with the exception being that the current to its start winding is not switched off during motor operation. In normal split phase motors this current is turned off after starting. A small capacitor within the start circuit of the capacitor run motor remains functional throughout start and operation of the motor.
Permanent split capacitor motors cost less than those with switching system. They provide greater starting torque and better running characteristics than split phase motors.
Capacitor run motors make good replacements for shaded pole motors. In this role they're more efficient and require lower current levels than shaded pole motors. For these reasons they're effective in fans with low starting torque requirements.
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