Multiobjective Optimal Design of an Inverter Fed Axial Flux Permanent Magnet In-Wheel Motor for Electric Vehicles

Versele, C.; Deblecker, Olivier; Lobry, Jacques

doi:10.5772/17025

Cited by 8 publications

(12 citation statements)

References 20 publications

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“…Rare earth PMs have conventionally been used as key components in realizing in-wheel motors for EVs [1]- [2]. However, by replacing rare earth PMs with ferrite PMs, the designed motor can achieve sufficient performance by adopting a coreless rotor structure and installing the reduction gearbox inside the stator.…”

Section: Structure Of Proposed Spm-type Axial Gap Motormentioning

confidence: 99%

“…In addition to having a small size, high performance requirements such as high power output and high efficiency are generally demanded for in-wheel permanent magnet (PM) synchronous motors. Therefore, powerful rare earth PMs have been employed in such motors [1]- [2]. However, over 90% of the world's rare earth elements such as neodymium and dysprosium depend on China.…”

Section: Introductionmentioning

confidence: 99%

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A Ferrite PM In-Wheel Motor Without Rare Earth Materials for Electric City Commuters

et al. 2012

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Abstract-Electric city commuters are vehicles used for commuting from suburbs to inner cities and for movement within cities. Because of the short distances that they cover and their small battery size, such vehicles are beginning to attract attention. Generally, a high-performance permanent magnet (PM) composed of rare earth elements, such as neodymium and dysprosium, is used in the inwheel PM synchronous motor (PMSM) of an electric city commuter. However, rising prices of rare earth elements and export restrictions on them are serious problems. Development of an in-wheel PMSM that does not utilize rare earth PMs is therefore highly desirable for electric city commuter vehicles. Accordingly, our research group has focused on a surface PM type axial gap structure that can achieve a high torque density and a short motor length in the axial direction. The designed motor structure with ferrite PMs replacing the rare earth PMs and the results of a three-dimensional finite element analysis are introduced in detail in this paper. Moreover, to examine the fundamental characteristics of the designed motor, a prototype is produced and tested.Index Terms-permanent magnet synchronous motor, electric city commuter, axial gap motor, surface permanent magnet rotor structure, ferrite permanent magnet

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Section: Structure Of Proposed Spm-type Axial Gap Motormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Ferrite PM In-Wheel Motor Without Rare Earth Materials for Electric City Commuters

et al. 2012

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“…In-wheel permanent magnet (PM) synchronous motors generally utilize powerful rare earth PMs in order to attain high performance such as high torque and high efficiency [1]- [2]. However, the use of rare earth PMs has become undesirable due to high prices and uncertainty over the supply of the required rare earth materials, namely, neodymium and dysprosium.…”

Section: Introductionmentioning

confidence: 99%

Examination for the higher efficiency in a ferrite permanent magnet 10 kW in-wheel axial-gap motor with coreless rotor structure

Sone

Takemoto

Ogasawara³

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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Powerful rare earth permanent magnets (PMs) are generally utilized in in-wheel PM synchronous motors for electric city commuters. However, the use of rare earth PMs has become undesirable due to high prices. An in-wheel PM synchronous motor that does not employ rare earth PMs therefore needs to be developed. We have previously proposed an in-wheel axial-gap motor that can generate high torque density and has features such as a coreless rotor structure with ferrite PMs and a reduction gearbox inside the stator. Through further research, we confirmed that suppression of eddy current loss arising in the rotor is important for attaining higher efficiency in high output motors. Accordingly, here we introduce an improved rotor with slits which can suppress eddy current loss. The results of experiments on a new prototype show that the improved rotor is effective in producing high efficiency and can satisfy the properties demanded of the in-wheel motors for electric city commuters.

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“…In addition to having a small size, in-wheel permanent magnet synchronous motors used for EVs demand high-performance features related to power output and efficiency. To satisfy such demands, powerful rare earth permanent magnets (PMs) are generally employed [1], [2]. Use of such magnets should be reduced, however, owing to increasing prices and export restrictions of rare earth materials.…”

Section: Introductionmentioning

confidence: 99%

Operation characteristics of ferrite permanent magnet in-wheel axial-gap motor with coreless rotor structure for electric city commuters

Sone

Takemoto

Ogasawara

et al. 2013

2013 IEEE Energy Conversion Congress and Exposition

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Small electric vehicles called city commuters are used for commuting and traveling short distances within cities. These vehicles have been extensively researched and developed because of their high environmental performance and small battery size. The in-wheel permanent magnet synchronous motor (PMSM) for electric city commuters generally utilizes powerful rare earth permanent magnets (PMs). However, the employment of rare earth PMs should be reduced, owing to increasing prices and export restrictions on rare earth materials, making it necessary to develop an in-wheel PMSM that does not use rare earth PMs. We propose a ferrite PM-type axial gap motor that generates high torque density and has features such as a coreless rotor structure and a reduction gearbox on the inner side of the stator. Detailed operational characteristics of the proposed motor remain unverified by experiment, so this paper presents such operational characteristics as obtained from experimentation on a prototype.

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Multiobjective Optimal Design of an Inverter Fed Axial Flux Permanent Magnet In-Wheel Motor for Electric Vehicles

Cited by 8 publications

References 20 publications

A Ferrite PM In-Wheel Motor Without Rare Earth Materials for Electric City Commuters

A Ferrite PM In-Wheel Motor Without Rare Earth Materials for Electric City Commuters

Examination for the higher efficiency in a ferrite permanent magnet 10 kW in-wheel axial-gap motor with coreless rotor structure

Operation characteristics of ferrite permanent magnet in-wheel axial-gap motor with coreless rotor structure for electric city commuters

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