Abstract: Aiming at the problems of reliability and maintainability during the operation of high power machine， the structure for a novel independent modular Permanent Magnet Synchronous Machine (PMSM) was designed. The mathematical model of modular PMSM was established and the inductance coupling of three-phase winding between the neighboring modules was analyzed. This machine was composed of detachable stators， whose modular machines could operate separately. Through the proposed concept of parent modules and sub-modules， parent modules were recombined with sub-modules to achieve the inductance decoupling between modules. Meanwhile， by exchanging the winding phase of sub-modules in parent module， the problem of asymmetric three-phase winding parameters caused by the discrete modules was also solved. The feasibility of structure for this machine was proved by the results of finite element analysis.

Key words: isolated module, PMSM, inductive coupling, parent modules, sub-modules