A design of axial-gap switched reluctance motor for in-wheel direct-drive EV

Shibamoto, Tohru; Nakamura, Kenji; Goto, Hiroki; Ichinokura, O.

doi:10.1109/icelmach.2012.6350022

Cited by 25 publications

(15 citation statements)

References 3 publications

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“…We have prototyped an axial‐gap type SR motor as a 12‐inch in‐wheel motor for a 2000‐kg microbus (Fig. ), and confirmed that the torque density is comparable to PMSM . On the other hand, we found a number of problems to be solved toward practical use, for example, the efficiency lower than that predicted by analysis and a high level of acoustic noise.…”

Section: Introductionsupporting

confidence: 55%

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Reducing Acoustic Noise of Axial‐Gap SRMs by Decreasing Axial Electromagnetic Force Ripple

Tokita

Goto

Ichinokura

2016

Electrical Engineering Japan

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SUMMARY Switched reluctance (SR) motors are motors that utilize the reluctance torque originating in the magnetic saliency between the stator and the rotor, which are made up of an electromagnetic steel sheet and windings without a permanent magnet. Because of their robustness and simple structure, SR motors are suited for use as the in‐wheel motor for traction motors of vehicles. In a flat space such as is present in in‐wheel motors, the axial‐gap structure has an advantage compared with the conventional radial‐gap structure for the space factor of a motor. An axial‐gap in‐wheel SR motor was tested in a microbus, and the bus could be successfully driven. The test results regarding the motor performance were satisfactory. However, the motor emits a loud sound. The acoustic noise of the axial‐gap SR motor is mainly caused by the axial electromagnetic force. This paper presents a method of reducing acoustic noise that is based on a model of the electromagnetic force on the axial‐gap SR motor.

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Section: Introductionsupporting

confidence: 55%

“…We have prototyped an axial-gap type SR motor as a 12-inch in-wheel motor for a 2000-kg microbus (Fig. 1), and confirmed that the torque density is comparable to PMSM [8].…”

Section: Introductionmentioning

confidence: 57%

Reducing Acoustic Noise of Axial‐Gap SRMs by Decreasing Axial Electromagnetic Force Ripple

Tokita

Goto

Ichinokura

2016

Electrical Engineering Japan

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“…And we have manufactured Axial-gap In-Wheel SR motors experimentally and applied to rear wheels of microbus shown in Fig. 1 [11]. The bus is able to travel 30km/h carrying 8 passengers on the level ground.…”

Section: Introductionmentioning

confidence: 99%

A study about optimum stator pole design of Axial-gap switched reluctance motor

Murakami

Goto

Ichinokura

2014

2014 International Conference on Electrical Machines (ICEM)

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Switched Reluctance (SR) motor attracts attention as motor that use no rare earth materials. And it is a candidate technology for electric vehicle application. In addition, Axial-gap structure has possibility of effective utilization of In-Wheel flat motor space. However, it is not established how to decide optimum design of Axial-gap SR motor. This paper mainly discusses the optimum design to maximize the torque-volume density of Axial-gap SR motor focused on the stator pole length. First, optimum stator pole length for increase torque-volume density is examined using FEA. The magnetomotive force is increasing when stator pole length is increasing, but motor total volume is also increasing. So, the optimum stator pole length regarding to the diameter for maximum torque-volume density is found. After that, a new Axial-gap SR motor is designed. Finally, the designed Axial-gap SR motor has high torque density as 51N･m/l.

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“…Among them, there is report regarding a double rotor-type axial gap structure [7]. Compared with the radial gap SR motor with the same volume, it achieves 1.7-fold higher output density [7]. Compared with the radial gap SR motor with the same volume, it achieves 1.7-fold higher output density [7].…”

Section: Introductionmentioning

confidence: 99%

Analytical Method Applying a Mathematical Model for Axial‐Gap‐Switched Reluctance Motor

Deguchi

Sumita

Enomoto

2016

Electrical Engineering Japan

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In this paper, an analytical method using a mathematical model for switched reluctance motors (SR motors) is proposed. The feature of this method is the representation of the effect of the mutual flux on the integral model by applying transient analysis utilizing preprocessed inductance tables. The advantage of this method is that the analysis time is reduced in comparison with the finite element method (FEM). The calculation results for the torque show little difference between the FEM and the proposed method, and the computation time was shortened. A 3.7-kW prototype axial-gap SR motor designed using the proposed method delivered the specified performance. C⃝ 2016 Wiley Periodicals, Inc. Electr Eng Jpn, 196(3): 30-38, 2016; Published online in Wiley Online Library (wileyonlinelibrary.com).

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A design of axial-gap switched reluctance motor for in-wheel direct-drive EV

Cited by 25 publications

References 3 publications

Reducing Acoustic Noise of Axial‐Gap SRMs by Decreasing Axial Electromagnetic Force Ripple

Reducing Acoustic Noise of Axial‐Gap SRMs by Decreasing Axial Electromagnetic Force Ripple

A study about optimum stator pole design of Axial-gap switched reluctance motor

Analytical Method Applying a Mathematical Model for Axial‐Gap‐Switched Reluctance Motor

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