| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive device using a motor that can constantly maintain the speed of a motor and moreover at the same time save power. SOLUTION: A device has a motor 30 for switching the number of the coil windings of coils 32-34 where a drive current flows to at least 2 transistors form among 35-44 for switching the number of 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 the motor 30 based on the period of the back electromotive voltage of the coils 32-34, and a motor control part 50 for selecting the number of coil windings based on the speed being detected by the speed detection part 51 and for controlling the transistors 35-44, so that a drive current can flow through the coils 32-34. |
