| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a speed control method and device enhancing landing accuracy even when a set value is changed to that of an arbitrary frequency to improve uncomfortableness by gravity change, oscillation, or the like caused by sudden deceleration of a cage of an elevator. <P>SOLUTION: In the speed control device of an inverter for the elevator, speed control for acceleration, constant speed and deceleration for an induction motor 5 is carried out by the inverter 4 of open loop control, and in the deceleration control, deceleration at a constant deceleration is carried out when the cage 8 of the elevator reaches a deceleration starting position in a certain distance from a landing position. When stopping the induction motor 5, lifting/lowering distance is obtained in advance for the deceleration from a reference frequency to a leveling frequency at a constant deceleration. The lifting/lowering distance is adjusted by performing constant speed operation at an intermediate frequency so that the lifting/lowering distance obtained is identical with the lifting/lowering distance for the deceleration from the arbitrary frequency to the leveling frequency at a constant deceleration. After the lifting/lowering distance is adjusted, the deceleration to the leveling frequency at a constant deceleration is automatically carried out. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
