Research on the temperature field of high-voltage high power line start permanent magnet synchronous machines with different rotor cage structure

Zhaobin Cao, Weili Li, Jinyang Li, Xiaochen Zhang, Dong Li, Meiwei Zhang

Research output: Journal PublicationArticlepeer-review

8 Citations (Scopus)

Abstract

For line start permanent magnet synchronous machines (LSPMSMs), the eddy current loss in the rotor, which has of significant effects on rotor working temperature, may cause thermal demagnetization to permanent magnet. Therefore, this paper addresses an investigation on the temperature distribution in LSPMSM based on a 6 kV, 315 kW prototype with solid starting cage bar. Firstly, the loss distributions, obtained from a 2-D transient electromagnetic field calculation, are determined as the distributed heat source in thermal analyses. Then, the fluid-thermal coupled analyses are performed, by which the temperature distributions in the machine are determined. Meanwhile, the calculated motor performance is verified via comparison with the measured results. The calculation results show that the temperatures in the rotor core and permanent magnets are relatively high. To find the solution for reducing the rotor working temperature, a rotor air slot structure was proposed in this analysis. The theoretical calculation indicates that the rotor working temperature reduction is obvious with the rotor air slot in the machine. Therefore, the operating situation of solid rotor LSPMSM could be improved effectively with the proposed rotor thermal solution, which also benefits the machine reliability and safety.

Original languageEnglish
Article number1829
JournalEnergies
Volume10
Issue number11
DOIs
Publication statusPublished - Nov 2017
Externally publishedYes

Keywords

  • High voltage permanent magnet motor
  • Solid rotor
  • Temperature field
  • Transient electromagnetic field

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

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