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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 significant influence of rotor-poles number on the electromagnetic performances of the novel rotor-permanent magnet flux-switching (RPM-FS) machine is investigated. The operation principles of the RPM-FS machines with 10-, 11-, 13- and 14-rotor-poles are analyzed from the generator and motor-driving perspectives, respectively, and the armature reaction field and PM field modulation...
In this paper, comparisons between two permanent-magnet-free (PM-free) machines, namely a wound-field flux-switching machine (WFFSM) and a switched reluctance machine (SRM), covering skewed-rotor and straight-rotor structures are conducted. The topologies and operation principles of the WFFSM are illustrated firstly. Then, the effects of rotor skewing angle on static characteristics, e.g., open-circuit...
In order to study the method of fault tolerant control for axial field flux-switching fault tolerant machine under single-phase faults, a new control strategy has been proposed, which combines the SVPWM fault tolerant algorithm and excitation of field winding, based on an inverter with fault tolerant topology called three-phase four-leg with field winding. The theory of SVPWM fault tolerant algorithm...
To enhance the reliability, sensorless vector control strategy based on sliding mode observer was adopted in flux-switching permanent magnet machine. The rotor position and speed estimation algorithm was obtained according to the voltage equation on αβ coordinate system of flux-switching permanent magnet machine, which contains the information of rotor positron. Further, a flux-switching permanent...
A dual-rotor axial field flux-switching permanent magnet (DRAFFSPM) machine is proposed and investigated in this paper. The static characteristics, such as the field distribution, the PM flux-linkage, the back-EMF, and the cogging torque, etc., are investigated based on the 3D finite element (FE) method. In order to gain sinusoidal back-EMF and reduce the cogging torque, the structure of the DRAFFSPM...
In this paper, a new modular linear flux-switching permanent magnet machine is presented. The operation principle is illustrated in detail. The electromagnetic performance analysis of the machine is carried out by the finite-element method. To investigate the influence of the mover pole pitch to stator pole pitch ratio on the new modular machine, the proposed machines with three different ratios are...
This paper presents an optimized design of a Hybrid-Excited Flux-Switching machine (HEFSM) with a very low quantity of permanent magnet (PM) for a Plug-in Hybrid Electric Vehicle (PHEV) traction application. The design examined is the result of an evolutionary optimization algorithm. The adopted solution needs only 650g of PMs to reach a maximum power of 80kW over a wide speed range (2,600 to 12,000rpm)...
Hybrid-excited axial field flux-switching fault-tolerant machine (HEAFFSFTM) is a novel permanent magnet machine. It offers several performance advantages which make it an interesting candidate for electric vehicles (EV), including a high torque density, high degree of fault-tolerance capability and wide operating speed range. However, this machine has a higher cogging torque than many other topologies...
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...
Hybrid-excited flux-switching linear machine (HEFSLM) adjusts the air gap flux density by DC excitation current, which may have great influence on its performances and parameters, such as thrust force, thrust ripple, inductances and etc. This paper mainly investigates its thrust ripple and inductances characteristics under different DC excitation currents with the frozen permeability (FP) method based...
In this paper, a new concept for the application of linear flux-switching permanent magnet (LFSPM) machine to ropeless elevator is proposed. The single-sided LFSPM machine with complementary and modular structure is investigated as a candidate. Moreover, the secondary stator is made of mild steel. The normal upward and downward characteristics of the linear machine are analyzed by the three-dimensional...
In this paper, a new thin yoke modular linear flux-switching permanent magnet (TYMLFSPM) machine with fault-tolerant capability is proposed. The analysis for the proposed TYMLFSPM machine is carried out by the finite-element method. The ratio of mover pole pitch to stator pole pitch is optimized to increase the thrust force and thrust force density.
Based on finite-element analysis (FEA), a 3D axially segmented coupled magnetic-thermal fields model of the flux-switching permanent magnet (FSPM) motor is proposed to count in the variations of flux density, iron loss and temperatures along axial direction. By dividing the FEA model into axial segments according to different temperatures in PMs, this new method can predict the electromagnetic and...
The main purposes of this paper consist of two parts: Firstly, the geometric topology and operation principle of a novel outer-rotor-permanent-magnet flux-switching (ORPM-FS) machine is proposed and simply introduced. Secondly, based on 2D finite element method, phase back electromotive force (back-EMF) waveform of the ORPM-FS machines with different combinations of stator slots and rotor poles is...
This paper presents a novel axial field flux-switching memory machine (AFFSMM) with series hybrid permanent magnet (PM) for extending the flux-weakening performance while maintaining high torque density. The key is the introduction of series hybrid PM with low-coercive force (LCF) PM which enables direct control of magnet flux. Operating principle of series PM is presented. The effects of the proportion...
Flux Switching Permanent Magnet machines have attracted considerable attention due to their simple and robust structure, easy heat dissipation, high torque densities and suitability for high-speed operations. To enhance these proprieties, we present in this paper an analytical model for prediction of the magnetic field for a 3 phase, 12 stator slots and 10 rotor tooth (12/10) flux switching permanent...
In this paper, a direct torque control (DTC) is proposed and implemented for five-phase fault-tolerant flux-switching permanent-magnet (FT-FSPM) motor drives. Firstly, the new motor topology is briefly presented, which adapts the concept of fault-tolerant teeth to provide the desired decoupling among phases. Secondly, the definition of d- and q-axes for the FT-FSPM motor is highlighted, which is crucial...
This paper proposes a rotor tooth shaping method to reduce the cogging torque of an axial flux-switching permanent magnet machine. The rotor tooth is shaped in different configurations, including constant, trapezoidal, asymmetrical, extended, and square shapes. 3-D finite element analysis is performed to compare the proposed shapes of rotor tooth. Peak-to-peak cogging torque, fundamental flux linkage,...
Due to the nature of doubly salient structure and high air-gap flux density, flux-switching permanent magnet (FSPM) machines typically suffer from large cogging torque, causing undesired acoustic noise and vibration, especially at low speeds. In this paper, various tooth chamfering methods for a 12/10 FSPM machine are proposed to reduce cogging torque. The influences of both circular bead and right...
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