| 摘要 |
PURPOSE:To shift a DC motor rapidly to a normal rotating state after starting in a simple structure by providing a reference voltage of different levels set in response to the operating state of the motor, and switching the reference voltage by a switch circuit at the starting time. CONSTITUTION:The output of a rotary speedometor 2 is converted by a frequency/voltage converter 4 to a voltage, which is inputted through a filter 5 to one terminal of a drive amplifier 6. The first reference voltage i when the motor 1 is started and the second reference voltage 9 when the motor is rotated normally are provided, SW2, SW3 of a switch circuit 10 are switched and controlled by a signal of a rotary command 13 for closing the SW1, thereby inputting any of the voltages 8, 9 to the other input of the amplifier 6. Accordingly, the voltage 8 is applied at the starting time, switched to the voltage 9 after the delay time, thereby enabling to start the motor 1 in a short time and obtaining stable operation without overshoot. |
