Speed Range Extension for E-Core Outer-Rotor Flux-Switching Permanent Magnet Machines Through Winding Reconfiguration

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Abstract
Aiming to extend the speed range of E-core outer-rotor permanent magnet flux-switching (OR-PMFS) machine, two derived structures are proposed in this article from the perspective of winding reconfiguration. Distinguished by the characteristics of introduced winding, the mechanism of winding reconfiguration is investigated, and outer-rotor dual-armature flux-switching (OR-DAFS) machine and outer-rotor hybrid-excitation flux-switching (OR-HEFS) machine are developed, respectively. With the aid of general air-gap field modulation theory, the speed range extension principles are revealed for two derived topologies. On this basis, a thorough comparison is put forward among the initial OR-PMFS machine, the proposed OR-DAFS machine, and the OR-HEFS machine. Particular emphasis is placed on the output torque and the speed range extension capabilities, and advantages and disadvantages are summarized in this process. Compared to the initial OR-PMFS machine, the proposed OR-DAFS machine could achieve a great balance between output torque and speed range, while the speed regulation capability of the OR-HEFS machine is more remarkable, and its speed range is much wider. The prototype experiment is carried out for both the OR-DAFS machine and the OR-HEFS machine, and the overall performance is concluded to visualize the outcome of this article.
Funding Information
  • National Natural Science Foundation of China (U24A20147)
  • National Natural Science Foundation of China (523B2073)

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