Influence of pole and slot combinations on vibration and noise in external rotor axial flux in‐wheel motors

Deng, Wenzhe; Zuo, Shuguang; Lin, Fei; Wu, Shuanglong

doi:10.1049/iet-epa.2016.0788

Cited by 35 publications

(20 citation statements)

References 24 publications

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“…It is well-known the acoustic noise of traditional radial-flux motors mainly comes from the electromagnetic force with the lowest non-zeroth spatial order. While for the axial-flux motors, the electromagnetic force and vibroacoustic characteristics are investigated in our previous work [22,23]. It is pointed out that the zeroth spatial order force is dominated in the generation of vibration and noise and the maximum noise peak occurs at 90 times rotation frequency.…”

Section: Optimisation Objectivementioning

confidence: 99%

Noise reduction of axial‐flux motors by combining various pole‐arc coefficients and circumferential shifting of permanent magnets: analytical approach

Deng

Zuo

2019

IET Electric Power Applications

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The electromagnetic noise of an axial-flux in-wheel motor (AFWM) is reduced by combining various pole-arc coefficients and circumferential shifting of permanent magnets (PMs) here. First, the analytical model of the air-gap magnetic field for the AFWM with various pole-arc coefficients and circumferential shifting of PMs is established. The influence of edging effect and stator slotting is taken into account through the radial correction function and complex relative permeance function, respectively. Subsequently, the torque and electromagnetic noise of the AFWM are derived analytically. A multi-objective optimisation of the AFWM is then implemented by the NSGA-II (non-dominated sorting genetic algorithm) based on the proposed analytical approach. Finally, the electromagnetic performance and vibroacoustic characteristics of the initial and optimised motors are compared and analysed. The results show that the proposed method by combining various pole-arc coefficients and circumferential shifting of PMs can reduce the noise of axial-flux motors effectively, without sacrificing the output torque. This study is of great significance for the vibration and noise reduction of axial-flux motors.

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Section: Optimisation Objectivementioning

confidence: 99%

Noise reduction of axial‐flux motors by combining various pole‐arc coefficients and circumferential shifting of permanent magnets: analytical approach

Deng

Zuo

2019

IET Electric Power Applications

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“…The source of torque ripples in PM BLDC motors can be due to motor design and motor control [2,[15][16][17][18]. In this work, the cogging torque due to the open slot structure in the design, nontrapezoidal back-EMF of the RFPM motor, and single-phase current commutation in the control is responsible for the torque ripples.…”

Section: Design Topology and Operating Principlementioning

confidence: 99%

Electromagnetic design and performance analysis of a two‐phase AFPM BLDC motor for the only‐pull drive technique

Yazdan

Kwon

2018

IET Electric Power Applications

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This study proposes a two-phase single-air-gap axial flux permanent magnet (AFPM) motor that offers a trapezoidal back-electromotive force (EMF) waveform to improve the performance of the only-pull drive technique compared with the radial flux PM (RFPM) motor. The only-pull drive technique provides the benefit of allowing the use of thin magnets in the motor without suffering from irreversible demagnetisation. In the proposed motor, the design geometry is primarily considered to achieve the desired trapezoidal shape of back-EMF. The effects of the geometry are explained with the help of air-gap flux density, flux linkage, and the leakage flux. Both the radial flux and the proposed motor adopt the same design concept and hold equal electromagnetic loadings. The profile of back-EMF and the electromagnetic torque driven by the only-pull drive technique are compared with that of RFPM motor with non-trapezoidal back-EMF. Furthermore, the split configuration is proposed for the AFPM motor to reduce torque ripples. The demagnetisation analysis is performed to confirm the operating point of the magnets in a split-AFPM motor. The results reveal that the AF motor is a good candidate for the only-pull drive technique.

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“…Meanwhile, the space inside the wheel is strongly limited, so the in-wheel motor has to be axially short [5]. Axial-flux permanent magnet (PM) (AFPM) in-wheel motors have many distinguished advantages, such as high power/ torque density, high efficiency, and compact axial length, and they are widely used in EVs [6]- [8]. The yokeless and segmented armature (YASA) topology is a new type of AFPM machine that comprises two external rotors and an inner stator [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Multiphysics Analysis of an Axial-Flux In-Wheel Motor With an Amorphous Alloy Stator

Zhang

Liang

et al. 2020

IEEE Access

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This paper presents a novel yokeless and segmented armature (YASA) axial-flux in-wheel motor with amorphous magnetic material (AMM) stator cores for a solar-powered electric vehicle. Although this new axial-flux in-wheel motor has many advantages such as high efficiency, shorter axial length, and high power density, its working condition is complicated. In-wheel motors are usually operated in electromagnetic, thermal, and other multiphysics environments. Increasing the performance requirements of in-wheel motors, such as power density, efficiency, and reliability, requires a multiphysics design approach. The focus of this paper is on the analysis of electromagnetic characteristics, losses, temperature distribution, mechanical behavior and other characteristics of the axial-flux in-wheel motor. The back electromotive force (EMF) and electromagnetic torque of the motor with harmonic current are obtained by the 3-D finite element method (FEM). The permanent magnet (PM) eddy-current losses when using different PM shapes are studied. The equivalent thermal model of the tape-wound AMM stator segments and the windings are established, and the temperature distribution of the motor is obtained. The mechanical behavior of the stator segments and the rotor disks when the motor is eccentric and axially offset is analyzed, and the structural strength of the motor is evaluated. Finally, a prototype of the motor is fabricated, and the electromagnetic performance and temperature of the motor are tested to verify the accuracy of the multiphysics design approach.

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Influence of pole and slot combinations on vibration and noise in external rotor axial flux in‐wheel motors

Cited by 35 publications

References 24 publications

Noise reduction of axial‐flux motors by combining various pole‐arc coefficients and circumferential shifting of permanent magnets: analytical approach

Noise reduction of axial‐flux motors by combining various pole‐arc coefficients and circumferential shifting of permanent magnets: analytical approach

Electromagnetic design and performance analysis of a two‐phase AFPM BLDC motor for the only‐pull drive technique

Multiphysics Analysis of an Axial-Flux In-Wheel Motor With an Amorphous Alloy Stator

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