| 摘要 |
PURPOSE:To prevent occurrence of counter torque and enable high torque and high speed to be realized, by turning transistors ON/OFF for controlling the conduction of exciting current, by making the current curve accommodated to a position detecting signal. CONSTITUTION:At the ends of exciting coils A to C of the first to third phases, transistors 24a, 24b, 24c, 24d, 24e, 24f are respectively inserted. Reference positive voltage for specifying output torque is supplied to the input terminal 30a of a multiplying circuit 30, and a position detecting signal is supplied to a terminal 30b. According to these inputs, the transistors 24a, 24b are turned ON/OFF, and the conduction of the exciting current of the exciting coil A is controlled, obtaining a current curve accommodated to the position detecting signal. |
