A Novel Axial Flux Magnetically Geared Machine for Power Split Application

Zhu, Z. Q.; Khatab, Mohammed F.; Li, Huayang; Liu, Yue

doi:10.1109/tia.2018.2859173

Cited by 19 publications

(7 citation statements)

References 33 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 [20–23], linear/tubular [110, 111] and axial‐field [112–115] PS machines, as well as PS memory machines [116] based on the concept of online magnetising and demagnetising PMs [117–120]. 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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“…Actually, the surface-type FMPM machines can also be designed with axial flux, which are even more promising in achieving compact structures and high torque densities. Figure 9 shows the configuration of an axial-flux MGPM machine for power split application in hybrid electric vehicles [24], and comparative investigation showed that it can achieve significantly higher torque than the conventional axial-flux YASA machine [25]. The application of an axial-flux MGPM machine in a wind turbine was investigated in [26], and a prototype with a torque density of 7.8 kNm/m 3 was designed, fabricated, and tested.…”

Section: Surface-type Fmpm Machinesmentioning

confidence: 99%

Flux-Modulated Permanent Magnet Machines: Challenges and Opportunities

Wang

Zhao

Niu

2021

WEVJ

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High torque density is a desirable feature of electrical machines used in traction applications, such as electric vehicle (EV)/hybrid electric vehicle (HEV) propulsion, wind turbines, more electric aircrafts, etc. The flux-modulated permanent magnet (FMPM) machine is considered as one of the most promising candidates to achieve high torque density. The incorporated gearing effect is ideal in reducing the rotating speed and amplifying the output torque of the FMPM machines. This paper aims at a comprehensive review of the topology evolution of the FMPM machines. Based on different structures, the FMPM machines are grouped into four categories: surface-type FMPM machines, spoke-type FMPM machines, partitioned stator FMPM machines, and bidirectional FMPM machines. The operating principles, advantages, drawbacks, and major applications of the FMPM machines are discussed in detail. In the end, the current state of the art, opportunities, challenges, and future trends of the FMPM machines are discussed. Therefore, this paper offers a systematic guidance on the selection and design of the FMPM machines.

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“…In [14], an AMG with superconducting bulk magnets was presented, which increased the torque density at the expense of higher manufacturing costs. In [15], a new axial-flux magnetically geared permanent magnet machine was proposed for power split application in a hybrid electric vehicle. Kouhshahi et al [16] have proposed a novel magnetically geared generator for low-speed applications with a torque density of 114 kNm/m 3 .…”

Section: Introductionmentioning

confidence: 99%

Optimal design of an axial magnetic gear by using particle swarm optimisation method

Sepaseh

Rostami

Feyzi

et al. 2022

IET Electric Power Appl

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This paper introduces a multi‐objective optimal design for an axial magnetic gear (AMG). In this study, the condition for high torque density and low cogging torque was deduced while the cost of the active materials was also reduced. The number and direction of permanent magnets and their arrangement were unchanged in the optimisation process, and the considered AMG's main dimensions were optimised using the particle swarm optimisation method. The optimised AMG was compared with the latest and similar structures with a relatively high torque density. To extract the produced torque density and cogging torque, three‐dimensional (3D) finite element analyses were conducted. The results showed that while torque density increased and cogging torque decreased, the total volume and magnetic materials used decreased significantly.

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A Novel Axial Flux Magnetically Geared Machine for Power Split Application

Cited by 19 publications

References 33 publications

Overview of novel magnetically geared machines with partitioned stators

Overview of novel magnetically geared machines with partitioned stators

Flux-Modulated Permanent Magnet Machines: Challenges and Opportunities

Optimal design of an axial magnetic gear by using particle swarm optimisation method

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