| 摘要 |
PURPOSE:To have smooth operation by emitting a speed reference with the acceleration suppressed when the torque reference signal from a speed calculation amplifier exceeds a torque limit value in comparing the speed reference with a speed feedback signal. CONSTITUTION:A speed comparison amplifier 12 compares the speed reference Sr from a speed reference generator 11 with a speed feedback signal Sd given from a pulse generator 24 via an F/V 25 and emits a torque reference signal Tr, and control of a winch 17 is made through a vector control calculator circuit 16, current computing amplifier 22, PWM control circuit 21, and converter/inverter circuits 18-20. When the absolute value of the torque reference signal Tr exceeds the torque limit value Tl set previously on a setting device 13, output of a comparator circuit 15 causes output of reference signal Sr from the speed reference generator 11 with acceleration suppressed. Thus smooth operation of the elevator is obtained, wherein no device with greater capacity is required. |
