Thermal analysis of a permanent magnet generator with built-in hydrostatic drive

Article type: Research Article

Authors: Wang, Tao^a; | Zhang, Yunce^a | Ji, Daxiong^a

Affiliations: [a] Ocean College, Zhejiang University, Zhoushan, China

Correspondence: [*] Corresponding author: Tao Wang, Ocean College, Zhejiang University,  No.1 Zheda Road, Zhoushan 316000, China.   Tel.: +86 580 2092891, +86 580 2092891; E-mail: [email protected]

Abstract: This paper studies thermal modeling and parameter determination for a permanent magnet generator with built-in hydrostatic drive, which has some special thermal characteristics including being cooled by circulating hydraulic oil and being filled with leaked hydraulic oil. To predict its temperature, a thermal model is developed by analyzing thermal sources and heat transfer paths and reasonably simplified based on empirical analysis. Then system identification is implemented to determine the model’s main parameters such as thermal resistances and thermal capacitances. The variations of heat transfer coefficients due to rotational speed and oil viscosity are taken into consideration through theoretical correction. Finally, comparisons between calculated results and experimental results under different load conditions are presented to verify the effectiveness of the thermal model. The effects of ambient temperature and input oil temperature on the temperature rise are also investigated based on the model. This study can also provide reference to the temperature estimation of those similar machines filled with liquid.

Keywords: Heat transfer, parameter estimation, permanent magnet generators, thermal model

DOI: 10.3233/JAE-180005

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 1, pp. 131-144, 2019