Reliability also plays a factor on account of the switching mechanism. The drawback is the expense required for two capacitors and a switching device. This type of motor has higher starting, lower loaded currents, and higher efficiency.
Once achieving full start-up, the start capacitor is disengaged. The capacitor start/capacitor run motor has both a start and runs capacitor in the circuit. Different designs offer higher efficiencies and power factor at rated loads. They are also the most reliable capacitor motor on account of not having a starting switch. However, they do have low starting currents, quieter operation, and higher life/reliability, thereby making them a good choice for high cycle rates. These motors will not perform well for heavy starting load applications. Since this requires a capacitor for continuous use, it does not provide starting power, therefore starting torques are typically small. For this type, a capacitor is permanently connected to the starter winding.
Permanent Split CapacitorĪ permanent split capacitor motor does not have any starting switch. This motor is more expensive due to the switching and capacitor components that are required.
The capacitor start motor is a split phase capacitor motor with a capacitor in series with the starting winding to create more starting torque. 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. Split Phase MotorĪ split phase motor uses a switching device to disconnect the start winding once the motor gets to 75% of its rated speed. The four basic types are split phase, capacitor start, permanent split capacitor, and capacitor start/capacitor run. The different types of single phase induction motors vary depending on the method used to started them. Also called a single phase induction motor, simply connecting to a single voltage line and an external capacitor is required to make this motor turn. Shaded pole motors are the original type of AC single-phase induction motor.
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