Comparative study of novel axial flux magnetically geared and conventional axial flux permanent magnet machines

Khatab, Mohammed F.; Li, H. Y.; Liu, Y.

doi:10.30941/cestems.2018.00050

Cited by 30 publications

(19 citation statements)

References 14 publications

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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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Section: Surface-type Fmpm Machinesmentioning

confidence: 99%

Flux-Modulated Permanent Magnet Machines: Challenges and Opportunities

Wang

Zhao

Niu

2021

WEVJ

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“…Substituting (2)-(4) into (1) gives (5). The active power is defined by (6) and finally the outer diameter is calculated from 7:…”

Section: Analytical Designmentioning

confidence: 99%

“…In double‐rotor AFPM machines in which PMs of opposite polarity face each other, magnetic flux from one rotor flows into the other without travelling circumferentially through the stator core; this may be eliminated which can lead to the removal of associated loss and cogging torque, although at the cost of a higher electromagnetic air gap. Previously published papers have mostly focused on conventional AFPM machines with a ferromagnetic core [4, 5]. Coreless AFPM machines have been studied less frequently.…”

Section: Introductionmentioning

confidence: 99%

Design and construction of new axial‐flux permanent magnet motor

Yazdi

Saied

Mirimani

2020

IET Electric Power Applications

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The present study investigated the design, simulation, and manufacturing of a new coreless stator axial‐flux permanent‐magnet motor. In addition, to magnets with magnetisation along the motor axis, the new structure included magnets that were magnetised circumferentially and buried at the rotor surface. The electromagnetic design of the conventional axial‐flux motor and the new motor was evaluated according to nominal values and design equations. In this regard, the number of poles and coils, as well as the outer diameter of both motors were assumed to be identical. It was observed that the axial length of the new motor is shorter than the conventional axial‐flux motor. Simulations were continued through comparing the motors in terms of air‐gap flux density, torque, and back electromotive force using the transient finite element method. A comparison of the results showed that the new motor had a better performance than the conventional axial‐flux motor. Subsequently, the new motor was manufactured and tested; the experimental results proved to be close to those presented in the analytical section.

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“…However, in many applications, mechanical gears are necessary to improve the torque, while they increase the manufacture and maintenance cost, as well as the system volume [4][5][6]. In order to avoid the mechanical gears, the axial flux permanent magnet (AFPM) machine has recently attracted much attention from scholars [7][8][9]. The high aspect ratio gives them many advantages such as compactness, high torque density, and good heat dissipation [10,11], which makes AFPM machines very suitable for direct-drive systems [12].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a Novel Axial-Radial Flux Permanent Magnet Machine with Halbach-Array Permanent Magnets

et al. 2021

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Electric machines with high torque density are needed in many applications, such as electric vehicles, electric robotics, electric ships, electric aircraft, etc. and they can avoid planetary gears thus reducing manufacturing costs. This paper presents a novel axial-radial flux permanent magnet (ARFPM) machine with high torque density. The proposed ARFPM machine integrates both axial-flux and radial-flux machine topologies in a compact space, which effectively improves the copper utilization of the machine. First, the radial rotor can balance the large axial forces on axial rotors and prevent them from deforming due to the forces. On the other hand, the machine adopts Halbach-array permanent magnets (PMs) on the rotors to suppress air-gap flux density harmonics. Also, the Halbach-array PMs can reduce the total attracted force on axial rotors. The operational principle of the ARFPM machine was investigated and analyzed. Then, 3D finite-element analysis (FEA) was conducted to show the merits of the ARFPM machine. Demonstration results with different parameters are compared to obtain an optimal structure. These indicated that the proposed ARFPM machine with Halbach-array PMs can achieve a more sinusoidal back electromotive force (EMF). In addition, a comparative analysis was conducted for the proposed ARFPM machine. The machine was compared with a conventional axial-flux permanent magnet (AFPM) machine and a radial-flux permanent magnet (RFPM) machine based on the same dimensions. This showed that the proposed ARFPM machine had the highest torque density and relatively small torque ripple.

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Comparative study of novel axial flux magnetically geared and conventional axial flux permanent magnet machines

Cited by 30 publications

References 14 publications

Flux-Modulated Permanent Magnet Machines: Challenges and Opportunities

Flux-Modulated Permanent Magnet Machines: Challenges and Opportunities

Design and construction of new axial‐flux permanent magnet motor

Design and Analysis of a Novel Axial-Radial Flux Permanent Magnet Machine with Halbach-Array Permanent Magnets

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