| 摘要 |
A system for driving a constant current drive type DC motor, which enables the supply of a low power to switching element(s) in a constant current drive circuit therein during, and in particular, at a start-up of the motor. In the DC motor drive system including a DC motor (1, 1a, 1'), a unit (3A to 3C, 3A' to 3C', 3': 4; 5; 9) for detecting a rotation of a rotor of the motor, a power supply unit (20, 20') for supplying a drive power to the motor, and a current drive circuit (8, 8') providing a constant current passing through a coil(s) of the motor supplied with the drive power during a normal operation of the motor, the power supply unit sequentially increases a voltage therefrom in multi-steps in response to the increase of the rotation during a start-up operation. Preferably, the power supply unit may change the voltage supplied therefrom so that a maximum value of the current is sequentially increased during the start-up. |
