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The goal of this paper is to investigate a proposed novel dual-rotor hybrid synchronous machine using two different types of rotors, i.e. the synchronous reluctance (SyR) and surface permanent magnet (SPM) rotors. Conventional design of dual-rotor machine utilizes SPM rotors on both inner and outer sides with toroidal winding configuration. However, there are limitations of using the permanent magnet...
The purpose of this paper is to investigate both the torque ripple reduction technique and influences of mechanical tolerance on the performances of a novel dual-stator 6/4 flux-switching permanent magnet machine. To minimize the torque ripple, step skew designs are studied to determine the optimal step number and step skew span angle. In addition, three common rotor mechanical tolerance deviation...
This paper proposes the analytical design methods of axial flux-switching permanent magnet (AxFSPM) machines. The analytical design methods take the influences of electric and magnetic loadings into account to calculate the specific sizing of the AxFSPM machine. In addition, the winding functions are implemented to derive the self-, mutual-, and d-axis and q-axis inductance. The results of analytical...
The purpose of this paper is to propose a novel flux-switching permanent magnet motor with an integrated airfoil-shaped rotor. Some of the conventional axial-flow compressor systems need an electric motor to provide mechanical energy input to the compressor. The proposed novel flux-switching motor-compressor can integrate both an electric motor and an axial-flow compressor into a single entity and...
This paper presents the study on a novel dual-stator 6/4 flux-switching permanent magnet (FSPM) machine for high-speed applications. Three different alternative topologies of dual-stator 6/4 FSPM machines are proposed and their performances regarding flux linkage, back electromotive force (back-EMF), torque density, and manufacturability are compared to the same specification of 10 kW and 15,000 rpm...
This paper proposes a modular hybrid-excited axial transverse flux permanent magnet machine. The operational principles and performance characterization are presented. The toroidal excitation windings are placed on both teeth of the U-type core and are excited by a field current. The field current can either buck or boost the magnetic flux produced by the circular permanent magnets on the rotor disk...
This paper presents an analytical method to realize even order harmonic elimination in flux-switching permanent magnet machines. The proposed method enables the calculation of total offset angle of flux linkages, taking into account an offset angle of stator slot and rotor poles. The 6-slot, 12-slot, and dual structure flux-switching permanent magnet machines are analyzed using the proposed method...
The purpose of this paper is to characterize the performance of a novel dual-stator six slot four pole (6/4) flux switching permanent magnet machine. The proposed dual-stator 6/4 topology eliminates even order harmonics in the flux linkage and back electromotive force, which are present in the conventional single stator topology. The resulting back electromotive forces of the proposed dual-stator...
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...
This paper presents a closed-form design optimization of surface permanent magnet (SPM) machines using concentrated windings layout. Over the last few years, the interest in the use of SPM machines with a high pole number for low speed direct-drive applications has significantly increased. In this paper, the analytical design model is developed and particle swarm optimization (PSO) is applied for...
The purpose of this paper is to introduce a novel dual-stator six stator slots four rotor poles flux switching permanent magnet machine that is viable for operation. The conventional six slots four poles topology suffers from asymmetrical flux linkage and severely unbalanced back-EMF, which makes it unfeasible. The proposed dual-stator structure utilizes windings in the second stator to produce a...
The purpose of this paper is to contribute to the high-speed aspect of flux switching permanent magnet machine by performing detailed electromagnetic design, performance evaluation, and trade-off comparisons. Topologies with multiple numbers stator slot/rotor pole combinations are analyzed, and their challenges for high-speed operation are discussed. The topology with 12 stator slots and 10 rotor...
This research attempts to find a new closed-form solution of toroid and overlapping windings for axial flux permanent magnet machines. The proposed solution includes analytical derivations for winding lengths, resistances, and inductances as functions of fundamental airgap flux density and inner-to-outer diameter ratio. Furthermore, phase back-EMFs, phase terminal voltages, and efficiencies are calculated...
The purpose of this paper is to analyze the pulsating torque in squirrel cage induction machines by studying the stator slot and rotor bar dimensions. To mitigate the pulsating torque produced by the non-sinusoidal spatial distribution of magnetomotive force (MMF) and permeance in the air-gap, design options are evaluated at various stator and rotor slot dimensions and operating conditions. Analytical...
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