A novel axial flux magnetically geared machine for power split application

Zhu, Z. Q.; Khatab, Mohammed F.; Li, H. Y.; Liu, Y.

doi:10.1109/ever.2017.7935927

Cited by 11 publications

(7 citation statements)

References 21 publications

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“…Based on the concept of PSs, numerous other types of PS machines can be developed, e.g. doubly fed dual-stator reluctance and induction machines as mentioned in Section 2 [20][21][22][23], linear/ tubular [110,111] and axial-field [112][113][114][115] PS machines, as well as PS memory machines [116] based on the concept of online magnetising and demagnetising PMs [117][118][119][120]. However, due to space limit, they are not being reviewed in this paper.…”

Section: Discussionmentioning

confidence: 99%

Overview of novel magnetically geared machines with partitioned stators

Zhu

2018

IET Electric Power Applications

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This study overviews recent development of a new class of magnetically geared machine topologies, i.e. partitioned stator (PS) machines. They are developed from magnetic gears and magnetically geared machines, as well as stator permanent magnet (PM) machines (switched flux, flux reversal, and doubly saliency PM), wound field, or hybrid PM and field winding machines. Based on the operating principle, i.e. magnetic gearing effect/air-gap field modulation and flux switching by the salient rotor iron poles, various PS machine topologies are developed. All have features of two stators, two air-gaps, and one segmented ferromagnetic rotor identical to a magnetic gear's modulating rotor. Their inherent relationships are revealed, while their electromagnetic performance is compared. Both PM and wound field PS machines are discussed, together with hybrid excited PS-PM machines and Vernier machines. It shows that all of these PS machines share the same torque production principle and the differences are mainly in PM configurations and relative positions of two stators. All PS machines have higher torque density per copper loss compared with their counterparts of single-stator machines. PS switched flux PM machines can produce the highest torque density per copper loss. Note: G r is the gear ratio, n i is the number of iron pieces, p 1 is the low-speed element pole-pairs, p 2 is the high-speed element pole-pairs, ω i is the ferromagnetic pieces' angular velocity, ω 1 is the low-speed element's angular velocity, ω 2 is the high-speed element's angular velocity. The negative sign indicates opposite rotating directions.

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Section: Discussionmentioning

confidence: 99%

Overview of novel magnetically geared machines with partitioned stators

Zhu

2018

IET Electric Power Applications

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“…Furthermore, a similar AF-FMPM machine was developed to conquer the drawbacks stated above. The machine can work in different operating modes and the MG torque output capability can be improved with the aid of the current angle control [19,20]. Several AF-FMPM machine topologies have also been proposed for the HEVs application [21,22].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Novel Axial Field Flux-Modulation Permanent Magnet Machines for Direct Drive Application

Yang

Rao

2022

Machines

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Axial field flux-modulation permanent magnet (AF-FMPM) machines have been developed for direct drive applications such as wind power generation, HEVs, and railway traction. However, the existing studies on AF-FMPM machines are limited to the PM rotor structure, and less research has been carried out on AF-FMPM machines with PM stator structure. This paper studies two axial field flux-modulation permanent magnet (AF-FMPM) machines, i.e., NS or NN type, which all consist of the same stator and rotor structures but the dual identical outer surface-mounted PM stators face each other in different position. A comprehensive theoretical analysis and global optimization of the AF-FMPM machine based on ANSYS Maxwell 3-D FEA is presented. The performance comparisons between the AF-FMPM machine (NS) and AF-FMPM machine (NN) are presented, including the influence of the critical structural dimensions on the machine performance, phase flux linkage, phase back EMF, cogging torque, and average torque performance. The results show that the phase back EMF and average torque of the AF-FMPM machine (NS) are more sinusoidal and higher than that of the AF-FMPM machine (NN). Furthermore, the NS type machine shows the non-saliency characteristics, while the NN type machine is the salient machine.

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“…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]. Moreover, besides radialflux MGMs, the corresponding axial-flux and transverseflux counterparts were proposed [23]- [25]. These candidates could potentially achieve higher torque density, lower rotor losses, and higher efficiency than the radial-flux counterparts.…”

Section: Introductionmentioning

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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A novel axial flux magnetically geared machine for power split application

Cited by 11 publications

References 21 publications

Overview of novel magnetically geared machines with partitioned stators

Overview of novel magnetically geared machines with partitioned stators

Analysis and Design of Novel Axial Field Flux-Modulation Permanent Magnet Machines for Direct Drive Application

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

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