Electromagnetic Characteristic Analysis of BFSLRM

Flux concentrated structure is adopted in the design of bidirectional flux switching linear-rotary motor, which not only brings high torque/thrust density, but also increases stator iron material magnetic saturation. In order to decrease the magnetic maturation level of the motor, the stator pole width, stator pole axial length, permanent magnet (PM) width, PM axial length and stator yoke height are selected as the analysis variables, which are closely related to the two magnetic saturation regions of the stator section based on the initial analysis. The expressions of flux density in the two magnetically saturated regions of the stator core related with the selected five structure variables are derived by numerical fitting method based on the initial simulation result calculated by finite element method. Then the optimization structure variable values are achieved, a prototype and its test experiment are carried out, which verifies that the torque and thrust densities are improved and the numerical fitting method is efficient and accurate for magnetic saturation calculation.