Design and Magnetic Field Analysis for Novel Module Integrated Permanent Magnet Synchronous Motor

High power electric machine requires high operational reliability and regular maintenance. To meet such requirements, a novel module integrated structure of permanent magnet synchronous motor is designed and the dynamic mathematical model is established, and the coupled magnetic field of stator winding among multiple modules is analyzed. An integral circular stator can be split into multiple modules, and then these modules are integrated according to design rules to form different module groups. Meanwhile, each module group is able to operate independently. In order to classify and distinguish the integrated modules, the concepts of master-module and sub-module are defined. By integrating multiple sub-modules into one master-module, the coupled magnetic field among multiple master-modules is decoupled. Because the windings in adjacent master-modules are disconnected, the parameters of three-phase windings of different master-modules are unequal. Thus, by phase exchange of the sub-modules, the total length of each phase winding in this master-module is equal and the inductance value of each phase winding is the same. Finally, the coupled magnetic field analysis is carried out by using the finite element method. The experimental results verify the feasibility of the proposed structural for permanent magnet motor.