Affiliations: College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
Correspondence:
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Corresponding author: Yinhang Ning, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Yudao Street, Nanjing, Jiangsu, China. E-mail:nyh4711343@nuaa.edu.cn
Abstract: This paper presents a hybrid excitation synchronous
machine (HESM). As a new type of machine, the HESM is expected to have the
advantage of high power density, high efficiency, and controllable magnetic
field. It is essential to give full considerations of the HESM in the design
stage. Hence, the electromagnetic and the thermal analysis are paid special
attention in this paper. At first, no-load characteristic is introduced, as
well as the structure and operating principle of the HESM. The calculated
and experimental results agree well. As the heat source of thermal analysis,
it is important to predict loss accurately. In the next step, the iron loss
is analyzed by finite element method, including the loss distribution
feature and the influence of field current on the iron loss. Considering
overheating may result in the irreversible demagnetization of the permanent
magnet and insulation failure of coil, a 3-D computational model is created
to conduct the thermal analysis using the predicted loss as heat source,
based on the theory of heat transfer. The permanent magnet and the field
winding, locating in the rotor, are analyzed emphatically due to its weak
cooling condition. The calculated temperature by the numerical method is
compared with the experimental result. This study can provide some design
references for this type of HESM.
Keywords: Hybrid excitation, synchronous machine, electromagnetic characteristic, loss analysis, thermal analysis, finite element method
