Abstract
Axial-flux permanent magnet (AFPM) motors have been attracting great interest due to their key advantages of high-torque density and compact structure. Concentrated windings are commonly used for AFPM motors since they significantly reduce the radial length of the end windings. This paper proposes a novel double-sided stator single-rotor motor topology where one stator is offset by π radians. This arrangement can cancel significant space harmonics produced by the concentrated winding and reduce the core and permanent magnet losses. Analytical analysis and finite element analysis (FEA) are used to verify the principle and validate the topology. The simulation results demonstrate that this proposed double-sided offset stator motor can reduce the core loss and permanent magnet loss significantly at base speed compared with the conventional double-sided stator single-rotor motor. In addition, the magnetic core saturation and induced voltage for the double-sided offset stator motor are significantly reduced.
Highlights
Axial-flux permanent magnet motors (AFPM) have attracted increasing interest because of their outstanding advantages, such as high-torque density, compact structure, and enhanced noise and vibration performance [1]
This paper proposes a novel double-sided offset stator single-rotor axial-flux motor, which can effectively eliminate the 8-pole magnetic field produced by a 9-slot concentrated winding, without affecting the 10-pole magnetic field
The baseline double-sided stator single-rotor (DSSR) AFPM motor is compared with the proposed DOSSR AFPM motor using analytical analysis and a finite element simulation
Summary
Axial-flux permanent magnet motors (AFPM) have attracted increasing interest because of their outstanding advantages, such as high-torque density, compact structure, and enhanced noise and vibration performance [1]. Reference [6] proposed a novel AFPM machine, applying nonconductive composite material for the construction of the rotor and stator with two iron rings for flux closure. The flux density in the stator cores is reduced by the cancellation, which is potentially a soft magnetic composites (SMC) has been studied by Marignetti et al [9] where the nopromising method for reducing losses while maintaining the same power rating. The analytical analysis harmonic cancellation presented in [13].harThe monics from in thethe concentrated field, which reduces theiscore loss andaPM loss flux density stator coreswinding is reduced by the cancellation, which potentially promiscompared with conventional statorthe single-rotor motor. MMF harThis paper proposes a novel method improve theanalytical performance of thefor double-sided monics, including the impacts of the statoran areoffset presented
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