Principle Investigation and Performance Comparison of Consequent-Pole Switched Flux PM Machines

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Abstract
This paper proposes a novel topology of consequent-pole switched flux permanent magnet (SFPM) machine with U-shaped permanent magnets (PMs) for torque improvement, which is attractive for traction applications. The proposed machine is geometrically derived from a conventional sandwiched SFPM machine by introducing airspace flux barriers and flat-type PMs. The proposed design can provide an effective circulating path for low-order field harmonics. This property is beneficial for the torque capability enhancement. The machine topologies and operating principle are introduced first. Moreover, a magneto-motive force (MMF) permeance based model for the proposed SFPM machines is employed to analytically reveal the underlying working mechanism. The electromagnetic characteristics of the two proposed SFPM machines are investigated by finite element (FE) analyses, and compared with those of the conventional sandwiched SFPM machine. Finally, a 6/13-pole SFPM machine with U-shaped PM structure is manufactured and tested to experimentally validate the theoretical and FE analyses.
Funding Information
  • National Natural Science Foundations of China (51707036)
  • Natural Science Foundation of Jiangsu Province for Youth (BK20170674)
  • Fundamental Research Funds for the Central Universities (2242017K41003)
  • Hong Kong Scholar Program (XJ2018014)
  • SEU Zhishan Young Scholars Program of Southeast University (2242019R40042)
  • Scientific Research Foundation of Graduate School of Southeast University (YBPY1974)
  • Jiangsu Planned Projects for Postdoctoral Research Funds (1116000266)
  • the Excellence Project Funds of Southeast University

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