关键词: 电励磁同步电机；, 磁共能；, 分布参数建模；, 有限元数值分析；, 谐波特性

Abstract: Accurate mathematical models are the basis and prerequisites for motor control,the current mathematical model of the electric excitation synchronous motor (EESM) is difficult to describe the harmonic and nonlinear characteristics of the motor during operation.A distributed parameter modeling method for electric excitation synchronous motor based on magnetic co-energy was studied.The magnetic co-energy data of the motor was obtained by finite element numerical analysis (FEA). By performing Fourier series expansion and polynomial fitting on the magnetic co-energy,a numerical analytical model that accurately describes the changes in magnetic co-energy was obtained.Using the principle of virtual displacement,the distribution parameter model of the magnetic flux, electromagnetic torque and voltage equation of EESM was established.The obtained distributed parameter motor model and FEA model were compared under variable conditions.The verification results show that the EESM distribution parameter model provides accuracy in describing motor torque and flux harmonic characteristics, and provides a theoretical basis for model-based motor control.

Key words: electric excitation synchronous motor (EESM), , magnetic co-energy, , distributed parameter modeling, , finite element numerical analysis (FEA), , harmonic characteristics