Performance Assessment and Comparative Study of a Permanent Magnet Machine With Axial Flux Regulator

This paper presents the performance assessment and comparative study of a novel topology of interior permanent magnet synchronous machine to enhance the flux regulation capability and expand speed range. The key is that the presented machine has an independent axial flux regulator that provides a shunted magnetic circuit to the primary radial stator. Benefitting from the larger d-axis inductance, the presented machine is able to provide a large capability of flux regulation. Using analytical method and three-dimensional (3-D) FEA, extensive comparison, between the presented machine and conventional IPMSM are done in terms of flux linkage, d- and q-axis inductance, torque capability, and cogging torque. The performance analysis and control trajectory using various control schemes for different operation regions are compared along with the 3-D FEA verification. Finally, the experimental tests are carried out to verify the analysis and comparison.