Abstract
This paper presents a comparative performance analysis of 4-kW axial flux permanent magnet synchronous machines (AFPMSMs) with and without a rotor core. The present study is intended for low-speed applications; however, the investigated machines are designed using an improved diameter-to-length method and their comparative performance is assessed using comprehensive electromagnetic finite element analysis. The results of this analysis suggest that the proposed coreless topology has the advantages of higher output power, higher efficiency, and lower iron or core losses compared to the conventional iron core AFPMSM.
Highlights
Synchronous machines can be built using a wound rotor structure or a permanent magnet (PM) rotor [1]
PM machines are more efficient than their field-excited counterparts [3], [4] because the rotor field is generated by permanent magnets mounted on the rotor surface rather than a brushed or brushless field excitation circuit [5], [6]
This paper proposes a high-efficiency 4-kW two-stack coreless axial flux permanent magnet (AFPM) machine for low-speed applications such as wind power generating systems, etc
Summary
Synchronous machines can be built using a wound rotor structure or a permanent magnet (PM) rotor [1]. PM machines are more efficient than their field-excited counterparts [3], [4] because the rotor field is generated by permanent magnets mounted on the rotor surface rather than a brushed or brushless field excitation circuit [5], [6]. This increases their reliability and reduces their maintenance costs [7], [8]. In addition to the conventional advantages associated with PM machines, axial flux permanent magnet (AFPM) machines have distinct advantages com-
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