Open AccessCompensation control of suspension force for LS‐BLPMSM
Author(s) -
Zhu Huangqiu,
Huang Jianbo
Publication year - 2017
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.815
H-Index - 97
eISSN - 1751-8679
pISSN - 1751-8660
DOI - 10.1049/iet-epa.2016.0448
Subject(s) - electromagnetic coil , control theory (sociology) , stator , suspension (topology) , torque , squirrel cage rotor , induction motor , compensation (psychology) , rotation (mathematics) , magnet , engineering , physics , computer science , control (management) , mechanical engineering , mathematics , electrical engineering , voltage , psychology , artificial intelligence , homotopy , psychoanalysis , pure mathematics , thermodynamics
To overcome the difficulty in start‐up of bearingless permanent magnet synchronous motor (BLPMSM), a novel structure of line‐starting BLPMSM (LS‐BLPMSM) is presented in this study, which has the ability of self‐starting. First, the operation principle of the LS‐BLPMSM is expounded and the suspension operation condition is deduced. Since two sets of windings are arranged in the stator of bearingless motor, different pole‐pair cooperation between two sets of windings cause breaking or driving torque, and the theory of pole‐pair cooperation is analysed. Second, the interference of squirrel‐cage on suspension force magnetic field is studied based on the T‐type equivalent circuit model of the equivalent induction motor formed by the suspension force windings and squirrel‐cage bars, and a suspension force compensation strategy is presented. Finally, an experimental prototype with 2‐pole‐pair torque windings and 1‐pole‐pair suspension force windings is tested under different working conditions with the proposed control strategy. The rotation speed and the displacements in x and y axes are provided. The simulation and experimental results have shown that the motor has good rotation and suspension performance, and the validity and feasibility of this control strategy are confirmed.