| 摘要 |
PROBLEM TO BE SOLVED: To enable accurate torque control by adjusting a feedback gain in an armature current control means depending on amount of manipulation calculated to eliminate deviation from a target supply power and an actual supply power. SOLUTION: If a difference voltage Vas outputted from a difference output circuit 20 is 0 when a reference triangular wave (a) having amplitude A1 and period T1 is inputted to a negative input terminal of a comparator 24 of an armature current control means, the reference voltage Vb of an adder 22 is inputted to a positive input terminal of the comparator 24. Therefore, a pulse signal having the width W1 is outputted from the output terminal. A voltage application time to the armature during the period T1 is regulated and supply current to armature can be controlled by impressing a voltage to the armature when the output of pulse signal C is at a high level and the supply current to the armature is feedback-controlled to eliminate difference depending on difference between the detected value of armature current and the target current value. As a result, accurate torque control can be realized. |
