What Is The Difference Between A Single-phase Split-phase Motor And A Single-phase Capacitive Motor? Non-automotive

Single-phase motors are divided into single-phase split-phase motors or single-phase capacitive motors, and the number of capacitors used in motors of different types and structures is different.

The single-phase split-phase motor requires two capacitors to start and run; one capacitor is the starting capacitor and the other is the running capacitor; the single-phase split-phase motor has a running winding and a starting winding embedded in the stator, and the difference between the two windings on the stator is 90 degrees, and they are all connected to the same single-phase power supply; since the single-phase power supply cannot generate a phase difference, it must use the characteristic of the capacitor's leading 90 degrees to give the motor a starting torque and generate a rotating magnetic field; after starting, the rotor speed reaches the motor. When the rated speed is 70%~80%, a centrifugal switch installed inside the motor will automatically separate the starting capacitor from the starting winding, and the running winding and the running capacitor will continue to maintain normal operation. This kind of split-phase motor can change the running direction by reversing the two wire ends of any one of the two sets of coils.

The single-phase capacitive motor uses only one capacitor, which is called the "working capacitor". Whether it is starting or running normally, it always starts at both ends of the winding and the running winding. The motor of this structure is designed to use the capacitor and starting winding of the single-phase split-phase motor in a long-term circuit. In fact, it becomes a two-phase asynchronous motor. Its operating performance, power factor, overload capacity and Efficiency is better than capacitor split-phase, since the capacitor does not have to be cut from the circuit during motor operation, so it does not require a centrifugal switch. It is very simple to change the direction of rotation of this single-phase motor, and only need to swap the two outlet ends of one of the two windings.