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This paper presents a new study on the comparison of dual-rotor single-stator (DRSS) and dual-stator single-rotor (DSSR) axial flux-switching permanent magnet (AxFSPM) machines. The DRSS and DSSR AxFSPM machines have the same dimensions except for stator and rotor yoke lengths. 3-D finite element analysis (FEA) and experimental verification are used for the comparison study. The comparison results...
In this paper the demagnetization faults that occur in a axial flux permanent magnet (AFPM) synchronous machine using 3D finite element method (FEM) are studied. Two different generator topologies, a single rotor and a double rotor coreless topology, are simulated. The harmonic components of the spectrum of the back-emf and the stator current waveforms are calculated and the fault indicator harmonics...
This paper presents a design algorithm of a dual rotor axial flux induction motor, constructed from two cage rotors and a toroidal wound stator. The steady state performance of the motor is analyzed using equivalent circuit and time stepping 3D finite elements method (FEM). The results show the correctness of proposed design algorithm and also show the high accuracy of equivalent circuit model for...
A computationally efficient method is presented to investigate additional cogging torque harmonics resulting from misalignment of the rotor and stator caused by assembly and manufacturing tolerances in an axial flux, fractional pitch PMSM. The hybrid analytical / FEA method utilizes superposition of a pole transition over a single stator slot and is used to predict the effect on cogging torque of...
This research attempts to compare the effects of the slot opening on axial flux permanent magnet machines with the fractional slot concentrated winding and the integer slot toroid winding. Analytical derivations of winding function, flux linkage, and back-EMF are presented, paying special attention to the slot opening. Specific machines having 24 slots 28 poles, 24 slots 20 poles, and 84 slots 28...
This paper proposes a novel 6 slot-4 pole axial flux switching permanent magnet machine using dual-rotor single-stator. The analytical method is used to find offset angle to eliminate even harmonics of flux linkage and back-EMF of a conventional 6 slot-4 pole topology. The analytical method is verified with finite element analysis. Proposed novel topology is also compared with a conventional dual-rotor...
In this paper a solution is proposed for contra-rotating propellers in electric unmanned aerial vehicles. It is based on a direct drive system where the contra-rotating blades are directly fixed on the rotors of an axial-flux permanent magnet motor. The latter one is constituted by two external rotors and a single internal stator divided in two different sides. The study is focused on a 6 slots-4...
Magnetic gears (MGs) have received little attention due to their low torque density and low torque quality. A way to increasing torque density in MGs is using axial flux configuration which increases permanent magnet surface while reducing the required iron core. An axial flux MGs can be designed as a single or dual sided one. The solution to the high axial forces in-between the disks, preferably...
An axial flux hysteresis motor is a self-starting synchronous motor which is well established and has flat speed-torque characteristics, smooth operation and low noise level with a very simple mechanical configuration. In this paper, effect of the air-gap length and number of stator slots on performance of a single-sided axial flux hysteresis motor is investigated. Based on the Finite Element method...
Cogging torque in fractional pitch PMSM is minimized when manufacturing induced errors are also minimized. This paper investigates additional cogging torque harmonics resulting from misalignment of the rotor and stator caused by assembly and manufacturing tolerances in an axial flux, fractional pitch PMSM. A hybrid analytical / FEA method utilizing superposition of a pole transition over a single...
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