发明名称 |
SENSORLESS DETERMINATION OF INITIAL ROTOR POSITION IN A SYNCHRONOUS MOTOR |
摘要 |
A method and apparatus of determining the position of a rotor at standstill relative to a stator in a synchronous motor elevator machine includes injecting an AC current having a predetermined single frequency and a predetermined initial phase angle into a stator coil of the stator, and sampling the injected current and resultant voltage a predetermined number of times per period of the frequency. Subsequently the method calculates a stator inductance from the sampled voltages and currents using a DFT. By incrementing the initial phase angel a predetermined number of times over a 360 degree cycle, and repeating the injecting, sampling, and calculating with each incremented phase angle, the algorithm provides a predetermined number of calculated stator inductances. The position of the d axis relative to the stator is then determined from the minimum of the calculated stator inductances. |
申请公布号 |
EP1410492(A2) |
申请公布日期 |
2004.04.21 |
申请号 |
EP20020706199 |
申请日期 |
2002.02.07 |
申请人 |
OTIS ELEVATOR COMPANY |
发明人 |
MARVIN, DARYL, J.;SIMONDS, TODD, A.;PETROVIC, VLADAN;SHEPARD, MARK;VECCHIOTTI, ALBERTO |
分类号 |
B66B1/30;H02P6/18;H02P21/00;H02P21/14;H02P27/04 |
主分类号 |
B66B1/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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