Isn't the starting winding symmetrical? If it's symmetrical, it's also an alternating pulsating magnetic field, how can you drive the rotor?
Because the magnetic field will not rotate (single phase winding and three-phase current phase difference of 120 DEG to produce a rotating magnetic field, so the starting winding), the working principle is in the starting winding current is generated through nearly 90 degrees of the magnetic field produced by a capacitor, the rotating magnetic field.
The two rotating magnetic fields are always the opposite, but it is important to know that their torque to the rotor is related to slip, and the T-S curve illustrates the problem. When the rotor is stationary, the two rotating magnetic fields are of equal magnitude to the rotor and are in opposite directions, so it cannot start. But when the rotor rotates one minute after the magnetic field along the direction of rotation of the rotor to the torque increases, the reverse direction of rotation of the rotor rotating magnetic field to the torque of the rotor is reduced, so the rotor can accelerate the operation, completed the start and run.There is a certain difference between the current in the starting winding and the running winding, and the magnetic field produced by it also acts on the rotor, so that the resultant moment of force in the two directions is not equal, and the rotor will turn naturally.
1. did not start winding, the rotor twist of the hand is because you can start to a rotating direction of the rotor, so that the main winding can rotate in a direction that, as long as you manually start after the rotor can not stop, because the main winding rotor will provide energy.2. the starting winding is symmetric, also accounted for 1/2 circle, starting winding due to capacitor phase shifting function and produce, in the electric cycle and the main winding is 90 degrees (like 90 degrees in advance), such changes in the magnetic field generated by the magnetic field have successively, have a fixed rotation direction, thereby according to a rotation direction of the rotor, the motor does not start winding and does not move because the main winding is 180 degrees and polar conversion, the rotor can be considered both left forces can be considered to be the right power, so the rotor is buzzing motionless.
