High power motors with cheap high power motor are produced. 220V AC single-phase motors can be started in the following ways:
The first type, split phase initiation, as shown in Figure 1, is assisted by auxiliary starting winding.Its starting torque is small.The operating rate remains roughly constant.Mainly used in electric fans, air conditioning fan motors, washing machines and other motors.
Second, when the motor is at rest, the centrifugal switch is switched on, and the starting capacitor takes part in the starting work after being electrified. When the rotor speed reaches 70%~80% of the rated value, the centrifugal switch will automatically jump off, and the starting capacitor completes the task and is disconnected.The starting winding does not participate in the operation, while the motor continues to operate with the winding winding, as shown in Figure 2.
Third, when the motor is at rest, the centrifugal switch is switched on, and the starting capacitor takes part in the starting work after being electrified. When the rotor speed reaches 70%~80% of the rated value, the centrifugal switch will automatically jump off, and the starting capacitor completes the task and is disconnected.And the running capacitor is connected in series to the starting winding to participate in the running work.This connection is generally used in air compressors, cutting machines, woodworking machines and other heavy load and unstable places.See Figure 3.
For a motor with a centrifugal switch, if the power cannot be started successfully in a short time, the windings will soon be burnt out.
Capacitor value: The double-value capacitor motor has large starting capacity and small operating capacity, and the withstand voltage is generally greater than 400V.
