Design of a 2-Stator-Module Flux-Switching Permanent-Magnet Resolver With Flux-Leakage Switching Principle

The compactness improvement and high-speed operation are emerging in electric machines for the rising demand on power density. As a machine position sensor, permanent magnet (PM) resolver can improve the high-speed angle accuracy by simplifying resolver demodulation system, in which the flux-switching PM (FSPM) topology is promising for its low-harmonic output voltage. However, the stator size of FSPM resolver is bulky and its high-compact design is still limited. To solve this, a novel yokeless modular FSPM resolver is specially designed in this article, based on the proposed flux-leakage switching operation principle. Thereby, the sine and cosine output voltages can be realized by only 2 stator modules, which significantly reduces stator volume and enhances the system compactness. The internal stator module parameters and mechanical shift angle between two modules are combined in the optimization. By the experiment evaluation, the optimal prototype has less than 0.6-degree angle error and the stator weight is 62.44% less than conventional yoke resolver.