Torque density and efficiency improvements of a Switched Reluctance Motor without rare earth material for hybrid vehicles

Takano, Yasunari; Chibá, Akira; Ogasawara, Satoshi; Takeno, Motoki; Hoshi, Nobukazu; Imakawa, Takashi; Takemoto, Mikio

doi:10.1109/ecce.2010.5618025

Cited by 39 publications

(6 citation statements)

References 16 publications

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“…The results confirm the measurements previously made in [1] [2][3] that the device rating for SR are low.…”

Section: Contributionsupporting

confidence: 91%

Power converter rating for switched reluctance motors

Lovatt

2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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The switched reluctance motor (SRM) is a low cost motor option. However it has lower power factor than competing motors and this has led to the incorrect perception that the power electronics are expensive. This paper shows that comparing an inverter fed motor to an SRM requires consideration of more than just power factor. In particular device utilization and device switching losses are just as relevant. When the complete picture is considered the ratings for the SRM are shown to be only 2/3rds that of the induction motor. Other authors have observed, but not explained, this reduced rating.

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“…The results confirm the measurements previously made in [1] [2][3] that the device rating for SR are low.…”

Section: Contributionsupporting

confidence: 91%

Power converter rating for switched reluctance motors

Lovatt

2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…Interior permanent-magnet synchronous machines [69][70][71][72][73] are among the most popular electric motors used in electric vehicles [23]. These machines contain rare-earth magnetic material which is costly and at the same time has negative impacts on earth.…”

Section: Interior Permanent-magnet Synchronous Machinesmentioning

confidence: 99%

High-Torque Electric Machines: State of the Art and Comparison

Alibeik

Santos

2022

Machines

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The state of the art of high-torque electric motors has been reviewed in this paper. This paper presents a literature review of high-torque density electric machines based on their airgap classifications, which brings a unique consideration to new design ideas to increase torque density. Electric machines are classified into three main groups based on their airgap configuration, i.e., (1) machines with a constant airgap, (2) machines with a variable airgap, and (3) machines with an eccentric airgap. This paper also presents the modeling of a high-torque airgap-less electric motor based on the concept of eccentric airgap. The torque density of this motor has been compared to motors available in the literature review. Among electrical motors with no permanent-magnet, airgap-less electric motors take the lead in terms of torque density, which is almost five times greater than the next motor, “in-wheel for electric vehicle”.

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“…These are a viable alternative although they tend to be not as efficient or torque-dense as the brush less permanent magnet motor. Manufacturers and researchers are addressing the application using switched reluctance machines [6]- [8] and some success if being found. However, the research literature is dominated by the brush less permanent-magnet motor.…”

Section: Imentioning

confidence: 99%

Are wound-rotor synchronous motors suitable for use in high efficiency torque-dense automotive drives?

Dorrell

2012

IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society

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This paper discusses the possibility of using wound rotor synchronous motors in automotive drive applications.Currently the brushless rare-earth magnet machine is the main choice of drive motor because it has high efficiency and it is very torque-dense, although some vehicles using induction motors.Issues with rare-earth material supply means manufacturers are looking at alternatives. This paper reviews the requirements for a wound-rotor synchronous machine using a current automotive drive application and carries out some load simulations using 2D finite element analysis. Direct comparison is made to a brushless permanent-magnet machine and first-pass designs arepresented. It is found that there are possibilities for this machine in this application; possibilities that current practice largely ignores.

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Torque density and efficiency improvements of a Switched Reluctance Motor without rare earth material for hybrid vehicles

Cited by 39 publications

References 16 publications

Power converter rating for switched reluctance motors

Power converter rating for switched reluctance motors

High-Torque Electric Machines: State of the Art and Comparison

Are wound-rotor synchronous motors suitable for use in high efficiency torque-dense automotive drives?

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