Motor driving system and motor operation recovering method

A motor operation recovering method applied with a motor driving system, wherein the motor driving system is configured for driving a motor, which is under an inertial rotation status without being driven, to stably rotate from an inertial rotation speed to a target speed, the motor driving system comprises a sensing unit, a control unit and a driving unit, the control unit is electrically connected with the sensing unit, and the driving unit is electrically connected with the control unit, the motor operation recovering method comprising steps of:

• detecting a time period of the inertial rotation status between a start and an elimination of an alert event as a real rotating status of the motor by the sensing unit;
• providing a gradual acceleration command by the control unit based on the real rotating status, wherein the control unit takes the time period of the inertial rotation status as a search key to obtain the gradual acceleration command from a correction-after-alert-event lookup table for determining the proper driving voltage level to be provided to coils so as to drive the motor to stably rotate from the inertial rotation speed to the target speed, a driving voltage is obtained by searching the lookup table according to the time period of the inertial rotation status between the start and the elimination of the alert event and configured to control immediate and continuous operation recovery of the motor and eliminate undesired surge current and abnormal excitation sound caused by the operation recovery of the motor;
• and
• providing the driving voltage to drive the motor to accelerate stably to the target speed by the driving unit according to the gradual acceleration command.