Quantitative Comparison of Flux Regulation Capability of Integrated-Induction-Based Hybrid Excitation Machines with Spoke-Type and Consequent-Pole PM Rotors

In recent years, hybrid excitation machine (HEM) drawn much attention due to their preferred flux regulation than permanent magnet (PM) machine. The integrated-induction-based HEM (II-HEM) achieves both the brushless excitation and flexible flux regulation while the high space utilization is obtained. This paper aims to quantitative comparison of flux regulation capability between the novel II-HEM adopting consequent-pole PM rotor and the conventional counterparts adopting spoke-type PM rotor. The flux regulation principle of the two II-HEMs are revealed based on equivalent magnetic circuit model, and validated by finite-element (FE) method. Then, the regulation coefficient kf is defined for evaluating the flux regulation capability, in which the actual saturation effect is considered. It is demonstrated that the novel II-HEM with consequent-pole PM rotor obtains better flux regulation capability than the conventional one.