| 摘要 |
PURPOSE:To eliminate the overshoot which is caused when the control shifts, by providing a control system to change a closed loop control system of the noncontrol state to the unsaturated state based on the output of the closed loop control system of the control state. CONSTITUTION:A control circuit 10 includes an operational amplifier OP4 which amplifies the output signal EC of a voltage control system and an operational amplifier OP5 which delivers the signal V4 which compares the output voltage V2 of the voltage control system with the output voltage V3 of the amplifier OP4 and controls to obtain the same level between the voltage V2 of the amplifier OP2 and the output voltage EC of an operational amplifier OP3. The signal V4 is supplied to the input of the OP2. Accordingly the OP2 is controlled to avoid an unsaturated state based on the signal EC when the OP2 is in an inactive mode. As a result, the time during which the current control is changed to the voltage control is shortened. Thus the overshoot can be virtually eliminated for the voltage of an armature. |
