| 摘要 |
PURPOSE:To rapidly decelerate without generating an overvoltage by stepwisely varying the output voltage and frequency of a variable voltage variable frequency (VVVF) type inverter to rapidly decelerate. CONSTITUTION:When a deceleration command signal is applied to a gate 24, monostable multivibrators 26, 27 output signals, a multiplexer 21 switches to a signal from a potentiometer 11 to select the output of a voltage divider 22 to output it. A PWM signal forming unit 3 receives the signal, and applies a stepwisely dropped deceleration signal to a VVVF inverter 4. After the prescribed time, the output of only the multivibrator 27 is eliminated, the multiplexer 21 selectively outputs the output of the divider 23, and further decelerated stepwise signal is applied to the inverter 4. Accordingly, a motor 6 is rapidly decelerated without overvoltage. |
