| 摘要 |
There is provided a DC motor drive device of the open loop control method. It is judged whether speed instruction data supplied corresponds to the DC motor drive instruction according to the speed instruction data. When it is decided that the speed instruction data is a drive instruction, switch means is controlled by a PWM pulse of a predetermined duty ratio during a predetermined acceleration period, thereby accelerating the DC motor. When the acceleration period has terminated, the switch means is controlled by a PWM pulse of the duty ratio in accordance with the speed instruction data, there by driving the DC motor. This limits the start current when performing start so as to reduce withstand current of a switching transistor or the like and surely performs start so as to increase the motor speed control range.
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