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 and Meiwei Zhang
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Zhaobin Cao: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Weili Li: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Jinyang Li: School of Electrical Engineering & Automation, Harbin Institute of Technology, Harbin 150001, China
Xiaochen Zhang: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Dong Li: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Meiwei Zhang: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Energies, 2017, vol. 10, issue 11, 1-14

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.

Keywords: solid rotor; high voltage permanent magnet motor; transient electromagnetic field; temperature field (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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