Comparison and Analysis of the Consequent Pole Double Stator Hybrid Excitation Machine for Wide Speed Range Driving Applications

The consequent pole double stator hybrid excitation machines (CPDS-HEMs) with different stator topologies are investigated and compared to achieve the optimal topology, so as to flexibly adjust the airgap flux to further expand the speed. The consequent pole rotor with N-S-iron core-S-N sequence is adopted, in which the iron core replaces part of the permanent magnet (PM), so that the PM flux is in parallel with the excitation flux. The stator wound the AC field winding realizing brushless excitation can be placed in the rotor shaft side or inside stator to form different topologies. In addition, the interior permanent magnet synchronous machine (IPMSM) and consequent pole PMSM (CP-PMSM) are adopted for comparison, the electromagnetic characteristics, including magnetic field distribution, no-load back electromotive force (EMF), torque characteristics, flux regulation capability and efficiency are evaluated by finite element analysis (FEA), which shows that the CPDS-HEM with AC field winding placed in the rotor shaft side has advantages in improving the speed and torque. Finally, the prototype is manufactured to verify above analysis, which has good prospects in wide speed range driving applications.