Abstract
When designing a structure of a rotor of interior permanent magnet synchronous motor (IPMSM), optimization for layouts of permanent magnets (PM) and a structure of yoke is concurrently required. Since the optimization problem becomes large and complicated, it is appropriate to decompose the original problem into sub problems. That is, the IPMSM rotor optimization problem is decomposed into an optimization problem of the structure of yoke under a fixed PM layout condition and an optimization problem of the layout of PM under a fixed yoke structure condition. However, a solution obtained from the decomposed problems is not necessarily optimal at the level of the original rotor optimization problem. In order to obtain an optimized solution at the original problem level, it is necessary to appropriately determine what conditions to be set for variables that are not designed. Therefore, we construct a meta-model relating the solution of topology optimization of yoke structure and the layouts of PM by using response surface methodology. Then, by determining the optimized layout of the PM using the meta-model, an optimized solution is obtained at the original problem level. Numerical example of optimization of the IPMSM rotor is shown. By the proposed method, high performance of average torque is realized.
