Electric vehicle traction motors without rare earth magnets

Widmer, James D.; Martin, Richard A.; Kimiabeigi, Mohammad

doi:10.1016/j.susmat.2015.02.001

Cited by 200 publications

(131 citation statements)

References 9 publications

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“…Table I shows typical values of the PM thermal remanent flux coefficient, B  , which is defined as the rate of PM remanent flux variation with temperature [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. The coefficient B  is observed to vary significantly for different materials, PM field typically decreasing as the temperature increases [30].…”

confidence: 99%

“…Ferrite magnets are often used in low cost applications including domestic appliances, and STFMM for general purpose applications, with the goal of reducing cost (see Table I [16]) and the dependence on rare earth materials, at the price of a decrease of the machine performance. It is noted however that PM machines using ferrite magnets still provide higher performance than induction and synchronous reluctance motors [17]. PM magnetization state can vary during the normal operation of the machine due to the injection of d-and/or qaxis current and the temperature variation [20].…”

Section: Introductionmentioning

confidence: 99%

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Permanent magnet magnetization state estimation using high frequency signal injection

Fernández

Reigosa

Guerrero

et al. 2015

2015 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract-Permanent magnet (PM) magnetization state estimation is important both for torque control and monitoring in conventional permanent magnet synchronous machines (PMSMs). Furthermore, this can be critical for variable flux machines (VFM). Use of high frequency signal injection methods for PM magnetization state estimation in NdFeB magnets has already been proposed. These methods make use of the variation of the PM high frequency resistance with the PM magnetization state due to the magnetoresistive effect. This paper address the generalization of magnetization state estimation using high frequency signal injection to other types of magnets like SmCo and ferrite, as well as to other magnet structures, e.g. isolated and non-isolated segmented magnets. Use of the magnetoresitive effect for the detection of irreversible/reversible PM demagnetization will also be shown to be viable.

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confidence: 99%

Section: Introductionmentioning

confidence: 99%

Permanent magnet magnetization state estimation using high frequency signal injection

Fernández

Reigosa

Guerrero

et al. 2015

2015 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…Rotor core is also laminated without permanent magnets or windings. Simple construction and high torque density makes it superior choice for different type of applications [10][11][12]. Torque is generated when the rotor poles tend to align with excited stator poles.…”

Section: Design Of Switched Reluctance (Sr) Motormentioning

confidence: 99%

Design and Performance Comparison of Permanent Magnet Brushless Motors and Switched Reluctance Motors for Extended Temperature Applications

K.S¹,

Murugan²

2018

PIER M

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Abstract-In-Service Inspection (ISI) plays a critical role in ensuring the safety and security of nuclear power plant and personnel. The limited access and high ambient temperature conditions impel the need for remote inspection techniques using semi automated vehicle. The electrical actuators driving the ISI robotic vehicle must satisfy the requirements of high operating temperature, high torque density, compact size and low weight. Currently, permanent magnet brushless motors are used due to its compact size and high efficiency. However, due to risk of demagnetization at high temperature as well as due to depleting resources of rare earth material alternate topologies without using permanent magnets shall be considered. This paper investigates the performance of Permanent Magnet (PM) brushless motor and Switched Reluctance (SR) motors for high temperature applications. SR motor is designed as per fundamental design equations satisfying the application requirements. Electromagnetic performance is verified by Finite Element Analysis (FEA) and thermal performance is verified by lumped parameter thermal analysis. Finally the performance of SR motor is compared with PM motor in terms of torque, efficiency, weight, cost and temperature rise.

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“…On the other hand, we will be considering the new trends in the materials to be used. The use of new materials such as rare earths in motor applications used for traction is an example to be developed for recycling rotating electrical machines [22].…”

Section: Future Workmentioning

confidence: 99%

Recycling rotating electrical machines

Hernández-Millan

Pacheco-Pimentel

2017

Rev. Fac. Ing. Univ. Antioquia

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This paper establishes design principles for rotating recyclable electrical machines (synchronous and induction), in other words electrical machines and machine components may be reused. Also, technological issues arising from following machine components are covered: stator core, rotor core, stator windings, rotor windings, bearings, shafts, and frames. Design principles discussed may be extended to transformers. Insulation materials in high voltage windings are not considered. This paper did not consider economic advantages of the processes, neither environmental consequences. Rotating machines considered in the present study are of a power range within 0.1 kW to 400 kW, frequencies 50 hertz and 60 hertz and poles 2, 4 and 6 although the general concepts could be applied to other machines. Required machine standards to achieve these goals are discussed, covering: speed, nominal voltage, capacities, shapes, dimensions, insulation, cores, windings, bearings, shafts and frames. RESUMEN:Este trabajo establece los principios de diseño para el reciclaje de máquinas eléctricas rotativas (sincrónicas y de inducción), en otras palabras, las máquinas eléctricas y sus componentes pueden ser reutilizados. Además, se cubren temas tecnológicos surgidos de las siguientes componentes de la máquina: núcleo del estator y rotor, devanados del estator y rotor, cojinetes, ejes, y carcasas. Los principios de diseño discutidos pueden extenderse a los transformadores. Este trabajo no consideró materiales de aislamiento en devanados de alta tensión. La economía de reciclaje no se discute ni consecuencias ambientales. Las máquinas rotativas consideradas en el presente estudio son de un rango de potencia entre 0,1 kW a 400 kW, frecuencias de 50 hertz y 60 hertz y polos 2, 4 y 6, aunque los conceptos generales podrían aplicarse a otras máquinas. Se discuten las normas de máquina necesarios para lograr estos objetivos, que abarca: velocidad, tensión nominal, capacidades, formas, dimensiones, de aislamiento, de los devanados, cojinetes, ejes y carcasas.

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Electric vehicle traction motors without rare earth magnets

Cited by 200 publications

References 9 publications

Permanent magnet magnetization state estimation using high frequency signal injection

Permanent magnet magnetization state estimation using high frequency signal injection

Design and Performance Comparison of Permanent Magnet Brushless Motors and Switched Reluctance Motors for Extended Temperature Applications

Recycling rotating electrical machines

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