| 摘要 |
A levelling apparatus for an AC elevator comprises a vector control unit (VC) for independently controlling a torque current component (It) and an exciting current component (Im) fed to an elevator drive induction motor (2). A difference between a level correction speed instruction, which increases in proportion to a level difference between an elevator car (10) and a target floor, and a rotation angular speed ( omega r) of the motor attributes to a torque current instruction (It). The torque current instruction is used as an instruction for the torque current component and corrected by a load on the elevator car, so that the level difference can be corrected at the level correction speed with high accuracy without being affected by passengers who get on or off the elevator car. <IMAGE>
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