| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive device using a motor that detects the speed of the motor and can accurately vary the number of coil windings of the motor. SOLUTION: A device has a motor 30 for switching the number of coil windings of coils 32-34, where a drive current flows to at least 2, transistors 35-44 for switching the number of the coil windings of the coils 32-34 of the motor 30 and driving the motor 30, and a speed detection part 51' for detecting the speed of motors 32-34, based on the back electromotive voltage of the motors 32-34. It also has a motor control part 50, where the motor control part 50 controls the transistors 35-44, while reducing the number of coil windings of the coils 32-34 for rotating the motor 30, based on the speed detected by the speed detection part 51 when the difference in speeds between the cases where the number of the coil windings of the coils 32-34 is small and where the number of the coil windings is larger than a specific threshold. |
