High Gear Ratio Flux Switching Permanent Magnet Machine for High Torque Performance

Kwon, Jung-Woo; Baloch, Noman; Kwon, Byung-il

doi:10.1109/access.2020.3006196

Cited by 12 publications

(6 citation statements)

References 24 publications

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“…Units DR-PMSM1 [9] DR-SynRM [10] DR-PMSM2 [11] DR-PMSG [8] DR-HESM [12] DR-FSSM [13] Coupling When dealing with dual rotor topologies, there is usually a magnetic connection between the rotating armatures and, rarely, a mechanical connection. In the first case, the flux on both rotors is controlled and affected by the stator's flux.…”

Section: Structure Featurementioning

confidence: 99%

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Novel Differential Evolutionary Optimization Approach for an Integrated Motor-Magnetic Gear Used for Propulsion Systems

et al. 2021

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This paper addresses the proposition of an electrical multiport propulsion system. This traction system contains an electric motor to which a magnetic gear is attached; it is called an integrated motormagnetic gear (IMMG) propulsion unit. This IMMG has two shafts and two levels of torque and speed. Thus, it is suited for the propulsion of an electric tractor, which has different diameters for the front and rear wheels. The IMMG design is optimized based on the differential evolution (DE) algorithm. For such an algorithm, offline tuning of its parameters may fail given the different characteristics of optimization problems. Therefore, a parameter adaptation that considers feedback from the search process can be an alternative. In this work, we propose a novel online strategy to control the DE algorithm's parameters. This strategy is based on a simple adaptation mechanism to generate a promising mutation parameter value for each individual in the population. The design process was evaluated through experiments, and a good correlation was found between the designed performances and tested results.INDEX TERMS differential evolutionary optimization, integrated motor-magnetic gear, EV propulsion.

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Section: Structure Featurementioning

confidence: 99%

“…-A hybrid excited synchronous machine (DR-HESM), [12], which again uses both rotors to strengthen the torque, and its major drawback is the presence of brushes to feed the field winding. -A flux switching synchronous machine (DR-FSSM), [13] which has a very reduced level of torque ripples, but the power factor is also quite poor.…”

Section: Introductionmentioning

confidence: 99%

Novel Differential Evolutionary Optimization Approach for an Integrated Motor-Magnetic Gear Used for Propulsion Systems

et al. 2021

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“…Owing to its special operating principle, i.e., magnetic gearing effect, as well as dual mechanical-port structure, the performance characteristics of MGMs are quite different from that of conventional permanent magnet synchronous machines (PMSMs) [14]. Thus, the pole-pair combinations [15], [16], winding configurations [17], back electromotive force (EMF) harmonic characteristics [18], wide speed range operation [19], [20], and performance characteristics during overload conditions [21] have been investigated. In order to further improve the compactness and torque density of MGMs, the bidirectional flux-modulation effect, which integrates two flux modulation groups into one machine, was introduced [22].…”

Section: Introductionmentioning

confidence: 99%

“…FIGURE16. The variation of outer rotor torque against the thicknesses of flux modulator and stator yoke.…”

mentioning

confidence: 99%

A Consequent-Pole Magnetic-Geared Machine With Axially Embedded Permanent Magnets for Hybrid Electric Vehicle

et al. 2021

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This paper reveals the fundamental reason for the asymmetrical issue in magnetic-geared machines (MGMs) based on flux modulation theory. The analysis indicates that the magnetic circuits of three-phase windings in MGMs are inherently asymmetrical. This asymmetrical issue is even more severe in conventional consequent-pole MGMs (CP-MGMs) because of the more distorted magnetic field. Hence, to address the asymmetrical issue, a novel structure featuring enhanced harmonic elimination capability is proposed in this paper. Consequently, torque density can also be improved. In particular, the proposed CP-MGM employs modular structure and axially embedded permanent magnets (PMs) to achieve symmetrical back electromotive force (EMF) waveforms and improved torque capability, respectively. To further improve the electromagnetic performance of the proposed CP-MGM, the PM arc ratio and flux modulator width ratio are analytically designed, which provides a general design guideline for CP-MGMs. To illustrate the merits of the proposed CP-MGM, a few other MGMs are included for a fair comparison based on finite element analysis (FEA). Results show the proposed CP-MGM can achieve more symmetrical back EMF waveforms and lower torque ripple, as well as lower PM consumption and higher torque density, as compared with its MGM counterparts.INDEX TERMS Asymmetrical magnetic circuit, cost-effective, high torque density, magnetic-geared machine.

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“…Owing to the structures of the magnetic resistance rotor and hybrid excited stator, the flux switching permanent magnet (FSPM) machine achieves many advantages, including the structural robustness, wide flux-weakening capability, high torque density and efficient cooling [1][2][3]. As the basis in the electromagnetic analysis of FSPM motors, an accurate and efficient calculation model of the motor magnetic field is significant.…”

Section: Introductionmentioning

confidence: 99%

An Improved Sub-Domain Model of Flux Switching Permanent Magnet Machines Considering Harmonic Analysis and Slot Shape

Liu

2021

IEEE Access

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The flux switching permanent magnet motor is a kind of double-salient machine with good speed regulation performances and application prospects. However, in traditional sub-domain models which are used to exactly calculate the magnetic field of the flux switching permanent magnet motor, the orders of major harmonics can not be intuitively obtained. The computational efficiency and practicality of the subdomain models are limited. Meanwhile, some errors are caused in the equivalent process of iron slot shapes. Aiming at these problems, an improved sub-domain model is proposed in this paper. The major magnetic field harmonics are selected in advance for each sub-domain region by the magnetic permeance function model of the air gap. In addition, the influence of the slot shape equivalence is corrected by the magnetic permeability of slots, and the accuracy of the sub-domain calculation is improved. The proposed model is verified to have the advantages of high accuracy and fast computing speeds by 2-D finite element analysis. A convenient and reliable approach for flux switching permanent magnet motor designs is provided thereby.

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High Gear Ratio Flux Switching Permanent Magnet Machine for High Torque Performance

Cited by 12 publications

References 24 publications

Novel Differential Evolutionary Optimization Approach for an Integrated Motor-Magnetic Gear Used for Propulsion Systems

Novel Differential Evolutionary Optimization Approach for an Integrated Motor-Magnetic Gear Used for Propulsion Systems

A Consequent-Pole Magnetic-Geared Machine With Axially Embedded Permanent Magnets for Hybrid Electric Vehicle

An Improved Sub-Domain Model of Flux Switching Permanent Magnet Machines Considering Harmonic Analysis and Slot Shape

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