Abstract
In this paper, the two-layer spoke-type (TLST) axial flux interior permanent magnet (AFIPM) machine is proposed. Simple flux barriers are added to optimize the air gap flux density, in which way there is no need to change the surface of the rotor. The optimization principle is revealed and the advantages of the TLST AFIPM machine compared with the spoke-type (ST) AFIPM machine are clarified. An optimization design process based on magnetic equivalent circuit combined with idealized and improved air gap flux density waveform is proposed, in which way the calculation time is saved by avoiding an excess of finite element method (FEM) simulations. Finally, 3D FEM simulation is adopted to verify the optimization results.
Highlights
Axial flux permanent magnet (AFPM) machines have some noticeable benefits compared with the conventional radial flux permanent magnet (RFPM) machines, such as higher power density, higher torque density and compact construction
The rotor surface design is hard to be adopted in axial flux interior permanent magnet (AFIPM) machines because their different lamination way of iron cores from conventional RFPM machines, unless using special material which has easy machinability and high magnetic permeability [14]
The difference of Total harmonic distortion (THD) is less than 0.5% which is acceptable of λ1 = 0.24, λ2 = 0.48 and k = 0.14
Summary
Axial flux permanent magnet (AFPM) machines have some noticeable benefits compared with the conventional radial flux permanent magnet (RFPM) machines, such as higher power density, higher torque density and compact construction As a result, they have been widely studied and applied [1,2,3,4,5]. The rotor surface design is hard to be adopted in axial flux interior permanent magnet (AFIPM) machines because their different lamination way of iron cores from conventional RFPM machines, unless using special material which has easy machinability and high magnetic permeability [14]. Study of AFPM machines, but they are very complex and time-consuming for the initial design, so the quasi-3D and 2D equivalent methods are widely [21,22,23].
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