Research on a new three dimensional segmented equivalent magnetic circuit method for vehicle claw pole generators

DOI:	10.11809/bqzbgcxb2023.01.024
Keywords:	claw pole motor; the equivalent magnetic circuit; analytic computation; numerical analysis; finite element method
Abstract:	The electric excitation claw pole generator is widely used in the field of heavy military vehicles due to its advantages of high mechanical strength and high reliability. The 3D finite element method takes a long time to calculate, while the traditional equivalent magnetic circuit method has some defects, such as insufficient consideration of magnetic leakage and inaccurate results. On the basis of the existing two dimensional magnetic circuit model, this paper proposes a mathematical model of a new three dimensional magnetic circuit of the claw pole generator based on axial segments. The calculation results of the model are accurate, and the magnetic leakage is fully considered, which greatly reduces the calculation time of the three dimensional finite element method. At the same time, the analytical calculation formula of the reluctance of each part is derived, and the analytical value of the back electromotive force and the magnetic density value of the motor are obtained on this basis. Finally, through the contrast analysis of the analytical results of the three dimensional finite element numerical method and the new 3D magnetic circuit analysis method, it is shown that the voltage range of the two motors in the external characteristic curve is 4.45%, which verifies the correctness and rationality of the proposed method and the theoretical analysis, and provides a theoretical basis for the research of electromagnetic characteristics of the electric excitation claw pole generator.
Published:	2023-01-28
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