Systems and method for controlling electric motors

An apparatus for controlling a permanent magnet synchronous motor, the apparatus comprising:

• an analog-to-digital converter configured to receive a feedback current from a motor and convert the feedback current to a digital current signal;
• a first power computation unit, implemented by a processor, coupled to the analog-to-digital converter for receiving the digital current signal and configured to generate a power signal and a first imaginary power signal based on the digital current signal and a three-phase voltage signal;
• a speed setting unit, implemented by a processor, configured to generated a speed signal based on an expected angular speed of the motor;
• a phase computation unit, implemented by a processor, coupled to the speed setting unit and the first power computation unit for receiving the speed signal and the power signal and configured to generate a phase signal based on the speed signal and the power signal;
• a voltage computation unit, implemented by a processor, coupled to the speed setting unit and the first power computation unit for receiving the speed signal, the power signal, and the first imaginary power signal and configured to generate a voltage signal based on the speed signal, the power signal, and the first imaginary power signal;
• and
• a drive signal generator, implemented by a processor, coupled to the voltage computation unit and the phase computation unit for receiving the voltage signal and the phase signal and configured to generate a three-phase voltage signal based on the voltage signal and the phase signal.

A non-transitory computer-readable medium including instructions stored thereon, which, when executed by a processor, cause the processor to carry out a method for controlling a permanent magnet synchronous motor, the method comprising:

• generating a digital current signal based on a feedback current received from a motor;
• generating a power signal and a first imaginary power signal from the digital current signal and a three-phase voltage signal;
• receiving a speed signal indicative of an expected angular speed of the motor;
• generating a phase signal based on the speed signal and the power signal;
• generating a voltage signal based on the speed signal, the power signal, and the first imaginary power signal;
• and
• generating the three-phase voltage signal for driving the motor based on the voltage signal and the phase signal.