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Abstract
Since permanent magnets (PM) are stacked between the adjacent stator teeth and there are no windings or PMs on the rotor, flux-switching permanent magnet machine (FSPMM) owns the merits of good flux concentrating and robust rotor structure. Compared with the traditional PM machines, FSPMM can provide higher torque density and better thermal dissipation ability. Combined with the soft magnetic composite (SMC) material and ferrite magnets, this paper proposes a new 3D-flux FSPMM (3DFFSPMM). The topology and operation principle are introduced. It can be found that the designed new 3DFFSPMM has many merits over than the traditional FSPMM for it can utilize the advantages of SMC material. Moreover, the PM flux of this new motor can be regulated by using the mechanical method. 3D finite element method (FEM) is used to calculate the magnetic field and parameters of the motor, such as flux density, inductance, PM flux linkage and efficiency map. The demagnetization analysis of the ferrite magnet is also addressed to ensure the safety operation of the proposed motor.
Highlights
Due to the unique flux concentrating structure and no windings or magnets on the rotor, the flux switching permanent magnet machine (FSPMM) has the merits of high torque ability and good mechanical structure
Based on the good flux concentrating structure of FSPMM, this paper proposes a new 3D flux FSPMM (3DFFSPMM) with soft magnetic composite (SMC) cores and ferrite magnets
It can be found that the permanent magnets (PM) flux per turn of 3DFFSPMM is around 1.5 mWb, and the average selfinductance per turn is around 1.74 μH
Summary
Due to the unique flux concentrating structure and no windings or magnets on the rotor, the flux switching permanent magnet machine (FSPMM) has the merits of high torque ability and good mechanical structure. Hoang in 1997, respectively, this kind of machine has under gone significant development in the past decades.[1] Various structures of FSPMMs have been investigated, including the E core, C core, multi-teeth, axial flux, transverse flux, axial laminated, outer rotor FSPMM using different electromagnetic analysis methods.[2,3,4,5] To enhance its ability for the high speed operation, the hybrid excitation method and mechanical flux regulated method were proposed as well.[6,7]. The new 3DFFSPMM can make utilizing of the 3D magnetic characteristic of SMC core to design the extended stator teeth and stator yoke to enhance the motor performance. The PM flux of the 3DFFSPMM can be regulated by rotating the outer PM in mechanical way, which will help the machine can be operated in the high speed region more efficiency
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