THE MOTOR SPEED IS STILL QUITE LOW THE ROTATING GENERATOR COAXIAL WITH THE ROTOR GENERATES AN ELECTR
The YVF2 SERIES FREQUENCY CONVERSION SPEED SPECIAL THREE – PHASE ASYNCHRONOUS MOTOR (with brush) started by the YVF2 SERIES FREQUENCY CONVERSION SPEED SPECIAL THREE – PHASE ASYNCHRONOUS MOTOR method is to add a damping winding on the rotor of the synchronous motor, also known as the starting winding. When the motor starts, it is the same as the asynchronous motor. When the motor speed reaches 95% of the rated speed, the DC excitation current is added to make the synchronous motor run in a synchronous mode. This kind of starting method is limited by the capacity of the power grid, so it can be divided into full-voltage starting and reduced-voltage starting.
Influenced by the motor structure of the SP system, the starting process of the motor is different from the asynchronous starting process of the conventional synchronous motor. During the starting process of the motor, there are stator excitation magnetic field and asynchronous rotating magnetic field induced by the rotor in the motor magnetic field, and there is also DC. Excited synchronous magnetic field. The synchronous motor with ordinary asynchronous start is only added to the synchronous excitation current when the motor speed reaches 95% of the rated speed. The motor of the SP system is in operation, the motor speed is still quite low, and the rotating generator coaxial with the rotor generates an electric potential. After the static rectifier, a DC excitation magnetic field is generated in the synchronous motor.