Motor driving method and motor driving system

A motor driving system, suitable for controlling a motor, the motor driving system comprising:

• a voltage detector configured to receive and detect voltage values feedback from the motor;
• a plurality of current detectors configured to receive and detect current values feedback from the motor;
• a controller, configured to:
• at an open loop phase and in response to a motor being operated under a steady-state, calculate an angle difference between an estimation coordinate axis of the motor and an actual coordinate axis, according to an estimation voltage value, an estimation current value and at least one electrical parameter feedback from the motor and in reference with the estimation coordinate axis of the motor;
• calculate an actual current value in reference with the actual coordinate axis according to the angle difference;
• calculate a load torque estimation value associated with the motor according to the actual current value;
• and
• in response to the open loop phase being switched to a close loop phase, compensating an output torque of the motor according to the load torque estimation value.