Motor driving circuit, motor driving method, and motor utilizing the same

A driving circuit for a motor comprising a stator and a permanent magnet rotor, the stator comprising a stator core and a stator winding wound on the stator core, wherein the driving circuit comprises:

• a controllable bidirectional AC switch connected in series with the stator winding between two ends of an AC power source;
• and
• a processing unit, configured to instantly send a trigger pulse to the controllable bidirectional AC switch, when a detected rotor magnetic field is a first polarity and a polarity of the AC power source is positive, or the detected rotor magnetic field is a second polarity and the polarity of the AC power source is negative after a zero voltage crossing point of the AC power source, during a motor starting stage;
• and
• the processing unit configured to send the trigger pulse to the controllable bidirectional AC switch after a delay time after the zero voltage crossing point, when the detected rotor magnetic field is the first polarity and the polarity of the AC power source is positive, or the detected rotor magnetic field is the second polarity and the polarity of the AC power source is negative after the zero voltage crossing point of the AC power source, during a motor operating stage,
• wherein the controllable bidirectional AC switch is a TRIAC, a first anode of the TRIAC is grounded or receives a low direct current voltage, the first anode of the TRIAC is also connected to a first end of the AC power source, a second anode of the TRIAC is connected to a second end of the AC power source via the stator winding and a fuse, and a control electrode of the TRIAC is connected to the processing unit via a resistor.