Speed regulating device null of inverter for elevator

摘要

PURPOSE: To prevent the stop of eddy current due to the increase of the load of an elevator by detecting that the output electric current of an inverter reaches an eddy current limit level lower than the eddy current stop level, carrying out the constant speed control at the speed in this detection, and carrying out the deceleration control equal to the speed pattern when a getting-on cage reaches a deceleration starting point. ;CONSTITUTION: The speed control for acceleration, constant speed, and deceleration for an induction motor 5 is carried out by an inverter 4 in open loop control, and in the deceleration control, deceleration at a constant deceleration speed is carried out when the getting-on cage 8 of an elevator reaches a deceleration starting position in a certain distance from a floor-reaching position. An eddy current limit judging part 16 detects that the output electric current of the inverter reaches the eddy current limit level lower than the eddy current stop level. The constant speed control at the speed in the detection is carried out, and the deceleration speed control at the speed in the deceleration for a certain time is carried out by a CPU 10 so that the deceleration distance equal to that in the deceleration by the speed pattern is obtained when the getting-on cage reaches the deceleration starting point.;COPYRIGHT: (C)1993,JPO&Japio