Analysis of a Hybrid Rotor Permanent Magnet Motor Based on Equivalent Magnetic Network

An equivalent magnetic circuit (EMC) model is built for a hybrid rotor permanent magnet (HRPM) motor. The key of the EMC model is that a novel section modeling method for permanent magnet (PM) is proposed to take PM end-leakage and local saturation of magnetic bridge into consideration, and it is used to separate the main magnetic circuit and leakage magnetic circuit of PM. Besides, a generalized equivalent method of winding magnetomotive force is adopted for the modeling of distributed winding. Meanwhile, an improved iterative algorithm is presented to solve the problem that the iteration does not converge when iron core is severely saturated. Then, the accuracy of the proposed EMC model is evaluated by experimental test and finite-element analysis. Finally, frozen permeability method based on the proposed EMC model is utilized to separate the PM torque component and the reluctance torque, which is time saving, and can be used to investigate and optimize the torque-angle characteristic clearly.