Patent ID: 8704474

Claim:
A digital signal processor for receiving a single-phase back electromotive force signal fed back by a motor and controlling an inverter to drive the motor based on the single-phase back electromotive force signal, the digital signal processor comprising: an electrical angle building module for receiving the single-phase back electromotive force signal and building a magnetic field electrical angle corresponding to the single-phase back electromotive force signal; and generating a six-step magnetizing phase changing signal by processing the magnetic field electrical angle; a rotation speed control module electrically connected to the electrical angle building module for generating a rotation speed control signal based on the magnetic field electrical angle; a pulse width modulation control module for receiving the rotation speed control signal and the six-step magnetizing phase changing signal and generating a pulse width modulation control signal to control the inverter so that the inverter drives the motor; and a field-weakening compensation module for generating a field-weakening displacement angle based on a motor rotation speed value of the motor and a group of predetermined compensation parameters and providing the field-weakening displacement angle for the electrical angle building module so that the electrical angle building module regulates the magnetic field electrical angle based on the field-weakening displacement angle.