Influence of voltage unbalance on the steady‐state performance of line start permanent magnet synchronous motors

Abstract

The line start permanent magnet synchronous motor (LSPMSM) can be used for direct-on-line (DOL) starting, so it is easily affected by voltage unbalance. Based on the finite element method (FEM) and analytical method, the influence of voltage unbalance on the steady-state performance of LSPMSM is studied in this paper. A two-dimensional finite element model is built, and the armature current, losses and torque ripple as a function of the phase voltage unbalance rate (PVUR) are obtained. The influence mechanism of voltage unbalance on the steady-state performance of a motor is demonstrated. Finally, a prototype of LSPMSM is manufactured and tested. By comparing the experimental data with the simulation data, the accuracy of the calculation model is verified, and the correctness of the research is proved. Hongbo Qiu(Non-member) received his graduation degree from the Harbin University of Science and Technology, Harbin, China, and a Ph.D. in electrical engineering from the same university in 2014. He has been with the Zhengzhou University of Light Industry, Zhengzhou, China, since 2014. His research interests include electromagnetic and thermal analysis on electrical machines, especially in permanent magnetic machines.

Influence of Voltage Subharmonics on Line Start Permanent Magnet Synchronous Motor

“…This task requires in-depth investigations on the effects of subharmonics on various equipment, including LSPMSMs. However, previous works on LSPMSMs supplied with the voltage of lowered quality have been limited to the effects of voltage unbalance [5], [29]- [33], voltage deviation (including over-and under-voltage unbalance) [5], [30]- [32] and voltage harmonics [30], [34], [35], while the impact of voltage subharmonics (or interharmonics) on these motors has not been studied yet, to the best of the authors' knowledge.…”