公开(公告)号：US20180248498A1

公开(公告)日：2018-08-30

申请号：US15868828

申请日：2018-01-11

Applicant: KONE Corporation

Inventor： Henry PIITULAINEN ,  Seppo SUUR-ASKOLA ,  Tero PUROSTO

IPC: H02N15/00 ,  H02K41/03 ,  H02P25/064 ,  B66B11/04

CPC classification number: H02N15/00 ,  B66B11/0407 ,  H02K41/033 ,  H02P6/16 ,  H02P6/17 ,  H02P25/064

Abstract: A method for levitation control of a linear motor includes supplying an alternating current or alternating voltage to at least one oscillating circuit including at least one sensing coil being or assumed to be arranged in a fixed spatial correlation to a mover part of the linear motor such that an opening plane of the sensing coil faces a sensor counter-surface of a stator part of the linear motor with a gap therebetween; receiving a response signal from the oscillating circuit; determining a gap length of the gap based on the response signal; and controlling the gap length by driving a magnetic levitation unit of the linear motor based on the determined gap length. An inductive sensing device and an elevator system, and a method for determining a position of the linear motor are also disclosed.