Axial-Gap Type Permanent Magnet Motor Modeling for Transient Analysis

Researchers who study axial-gap type permanent magnet motors often have difficulties in analyzing the motor because the motor structure makes it difficult to define the two-dimensional (2D) finite-element model surfaces. Sometimes they try to define the surface as a cylindrical cutting surface with appropriate assumptions and sometimes they prefer three-dimensional (3D) finite-element simulations. However, the 2D analysis of the axial-gap type motor is restricted to a specified model and it is difficult to consider winding coil shape perfectly in most cases, and the 3D simulations take too long to achieve the desired results. This paper concerns the axial-gap type permanent magnet motor modeling method which can perform the transient simulation with one static 3D finite-element simulation and a winding coil mesh. This model can shorten the simulation time dramatically. To verify the feasibility, a 2phase/4phase vibration motor transient simulation was carried out and the results are well matched with the measured ones.