Patent ID: 8169170

Claim:
A motor driving device for driving a motor including a speed detector to detect a speed of a moving element of the motor and for outputting the speed as speed detection information, the motor driving device comprising: an inverter for converting supplied DC power to driving power for driving the motor, and for supplying the driving power to the motor; a speed control unit for generating a speed control signal group based on command information received externally and the speed detection information received from the speed detector, and for adjusting the driving power based on a drive control signal included in the speed control signal group, thereby controlling the speed of the motor; and a regeneration preventing means for determining whether the motor is in a state possibly causing regenerative phenomena or in a state not causing regenerative phenomena based on the command information and the speed detection information, and for performing a regeneration reduction process to reduce the regenerative phenomena according to the determination result, thereby preventing the regenerative phenomena.