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Continuous torque generation in 4/2 SRM using formulated cut-edge and FEM analysis

This paper presents a parametrical rotor geometry of 4/2 SRM to produce continuous torque in any rotor positions for all dimensions of motor. One of the most important drawback of 4/2 SRM is discontinuities torque characteristic, so the ability of self-starting and continuous torque characteristic are obtained due to the fact that flux paths prefer to form in minimum reluctance using creating a cut edge in rotor. In order to find optimal dimensions of cut edge and using numerical optimization methods, position of starting cut edge and other necessary equations for this cut edge are obtained parametrically. In order to clarify the proposed cut edge equations, a sample conventional 4/2 SRM with predefined dimensions is chosen. So the locus of possible places and equations are obtained by replacing motor dimensions to cut edge equations. In order to find optimal cut edge, two factors position and angle of cut edge are changed and T-0 characteristic of each structure is obtained and analyzed using 2-D finite element method. Optimal geometry with maximum efficiency is chosen and total T-0 characteristic for periodical phase excitation is obtained. The comparison result between proposed and conventional geometries presents continuous torque behavior, self-starting ability, higher torque capacity and lower ripple value for the proposed motor.