Optimization of Ventilation Spacer for Direct-Drive Permanent Magnet Wind Generator

Xiang Zhao, Yu Fan, Weili Li, Dong Li, Junci Cao and Yihuang Zhang
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Xiang Zhao: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Yu Fan: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Weili Li: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Dong Li: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Junci Cao: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Yihuang Zhang: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Energies, 2019, vol. 12, issue 8, 1-18

Abstract: As the rated capacity of the Direct-Drive Permanent Magnet Wind Generator (DDPMWG) increases, the heat produced from the generator’s inner components also increases and it becomes difficult to transfer the inner heat to the ambient. The ventilation spacer has a significant influence on the heat transfer process of DDPMWG. Thus, this paper focuses on the optimization of the ventilation spacer on the thermal field of DDPMWG. Firstly, the fluid flow and heat transfer coupled numerical calculation model is established. The physical model, composed of two half-slots and one tooth of DDPMWG, is established due to the structural symmetries to save the calculations. The sources and boundary conditions for the thermal calculations are also given. Five new ventilation spacers, compared with the original one, are proposed to investigate the thermal fields. The pressure drop and temperature field are compared to find the optimized ventilation spacer for the DDPMWG. The criteria are also presented for judging the heat transfer capacity. To validate the optimized ventilation spacer, the temperature rises of the armature winding with original and optimized ventilation spacers are measured. It proves that the armature winding’s temperature rise of the optimized ventilation spacer is about 4.7 K lower than that with the original ventilation spacer.

Keywords: direct-drive permanent magnet wind generator; ventilation spacer; numerical calculation; thermal 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: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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