公开(公告)号：US20180375453A1

公开(公告)日：2018-12-27

申请号：US16065836

申请日：2015-12-23

Applicant: Yongle MAO ,  Wei ZHANG ,  Xiaoyun ZANG ,  Robert Bosch GmbH

Inventor： Yongle MAO ,  Wei ZHANG ,  Xiaoyun ZANG

IPC: H02P21/18 ,  H02P21/34 ,  H02P21/06

CPC classification number: H02P21/18 ,  H02P21/06 ,  H02P21/14 ,  H02P21/34 ,  H02P2207/05

Abstract: The present invention relates to a method and apparatus for on-line estimation of an initial position of a surface permanent magnet electric machine in a stationary state or at a first speed. The method (100) for on-line estimation of an initial position of a surface permanent magnet electric machine in a stationary state or at a first speed comprises: injecting a high-frequency pulsating voltage signal; acquiring a d-axis high-frequency current signal responding to the high-frequency pulsating voltage signal; and estimating an initial position of the surface permanent magnet electric machine on the basis of a second harmonic of the d-axis high-frequency current signal. According to the present invention, the apparatus (200) for on-line estimation of an initial position of a surface permanent magnet electric machine in a stationary state or at a first is speed is also provided, the apparatus comprising a voltage injection unit configured to inject a high-frequency pulsating voltage signal, a current acquisition unit configured to acquire a d-axis high-frequency current signal responding to the high-frequency pulsating voltage signal, and an analysis unit configured to analyse a second harmonic of the d-axis high-frequency current signal so as to estimate an initial position of the surface permanent magnet electric machine.