Motor system and control method thereof

A motor system, suitable for connection to a power supply and a motor, the motor rotating when driven by an output current and generating a position signal associated with a rotational speed of the motor, the motor system comprising:

• a motor driver, further comprising:
• a power module and a control module,
• wherein
• the power module generates a DC bus voltage and the output current based on an input voltage from the power supply, and produces a feedback voltage value corresponding to the DC bus voltage and a plurality of feedback current values corresponding to the output current, wherein the output current includes a first-phase current, a second-phase current, and a third-phase current;
• and
• the control module, coupled to the power module, generating a modulation signal and a pulse width modulation (PWM) signal based on the feedback voltage value, the feedback current values, and the position signal,
• the power module adjusts the first-phase current, the second-phase current, the third-phase current, and the DC bus voltage in response to the modulation signal and the PWM signal.