关键词: 混合式步进电机, 转矩, 二维等效, 有限元仿真

Abstract: Due to the complexity of the magnetic circuit in hybrid stepping motors,the simulation and calculation of its electromagnetic performance is quite difficult. The accuracy of traditional magnetic circuit method is insufficient,and 3 - D finite element method has a huge computational workload, so it is difficult to meet the requirements of engineering applications. In this paper, a method of permeance equivalence is used for converting the 3 - D magnetic field in hybrid stepping motors to 2-D magnetic field,then the 2-D finite element simulation is achieved. This method is more precise than magnetic circuit method,and faster than 3-D finite element method. The 2-D equivalent finite element simulation method is further simplify to calculate the torque characteristics under one stator pole,and the entire torque characteristics are obtained by overlying. This paper takes a two phase hybrid stepping motor with a step angle of 1. 8° as an example to conduct research. Cogging torque and holding torque are calculated. The results of simulation and experiment are relatively close, which verifies the feasibility of the simplified 2-D equivalent finite element simulation method.