Magnetic Field Analysis of Modular Spherical Induction Motor

As an actuator that can realize multivariant operation, spherical induction motor has attached much attention due to its easy control, compact structure, high precision, and so on. For the designed novel motor with modular structure, this article proposes a calculation model for studying the dynamic magnetic field. And this model adopts a semi-analytical approach to derive the spherical harmonics description of the dynamic magnetic field by solving the different partial differential equations with the second order vector magnetic potential. Meanwhile, to overcome the difficulty in stator manufacturing with soft magnetic composite (SMC) materials, the modularity technique is applied. Finally, by contrasting the finite element analysis with analytical results, the proposed model can be verified that it has a good accuracy.