2-phase brushless ac motor with embedded electronic control

A control system for a 2-phase brushless AC motor, comprising:

• a position sensor for detecting a position of a rotor of the motor;
• a polarity detector for detecting a polarity of an AC supply for the motor;
• a first and second switching circuits respectively coupled to a first and second phase coils of the motor;
• a current sensor for detecting conduction of the first and second phase coils;
• and
• a controller for controlling conduction of the first and second switching circuits according to signals provided by the position sensor, the polarity detector and the current sensor;
• wherein the control system is embedded in the motor;
• the position sensor, the polarity detector, the current sensor and the first and second switching circuits are connected to the controller;
• and the controller is configured to turn on the first switching circuit at appropriate time interval in an AC cycle and turn on the second switching circuit to compensate for another time interval according to the position of the rotor.