A split phase motor uses a switching device to disconnect the start winding once the motor gets to 75% of its rated speed. Although this type has a simple design which makes it less expensive for commercial use, it also has low starting torques and high starting currents.
The capacitor start motor is basically a split phase capacitor motor with a capacitor in series with the starting winding to create more starting torque. This motor is more expensive on account of the switching and capacitor requirement.
A permanent split capacitor motor does not have any staring switch. For this type, a capacitor is permanently connected to the starting winding. Since this capacitor is required for continuous use, it does not provide starting power, therefore starting torques are typically low. These motors are not recommended for heavy starting load applications. However, they do have low starting currents, quieter operation, and higher life/reliability, thereby making them a good choice for high cycle rates. They are also the most reliable capacitor motor on account of not having a starting switch. They can also be designed for higher efficiencies and power factor at rated loads.
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