关键词: 混合式步进电机, 等效变换, 自定位转矩, 有限元仿真

Abstract: Cogging torque is an important index of hybrid stepping motor. Calculation of airgap specific permeability method and tooth-layer specific permeability method is easy but has no high-precision,exactly in magnetic saturation. Equivalent transformation of the hybrid stepper motor model was studied based on constant magnetic circuit. An equivalent transformation of 2D finite element model was proposed that 3D magnetic circuit was transformed into 2D with higher precision and less grids. Models of different step angles and different air gaps were simulated and compared so that different cogging torques were reached. Two prototype with step angles of 0.9°and 1.8 were made and tested. The results of experiment and simulation were in good consistency, which verifies the feasibility and accuracy of the equivalent transformation method.

Key words: hybrid stepper motor, equivalent transformation, cogging torque, finite element simulation