High efficiency and high performance motor for energy saving in systems

IEEE Trans. on Ind. Applicat.

Limsuwan

et al. 2014

This paper presents a novel variable magnetomotive force flux-intensifying interior permanent-magnet (IPM) (VFI-IPM) machine, which uses only low-coercive force magnets to reduce usage of rare earth metals. The VFI-IPM machine is designed with a characteristic of L d > L q , which is typical for FI-IPM machines and uses low-coercive force magnets with magnetization level control. A theoretical magnet operating point analysis was conducted to investigate the design methodology. A proof-of-principle prototype machine was then designed based on these principles. Simulation and experimental results show that the VFI-IPM prototype can achieve a wide torque-speed envelope and variable torque-speed characteristics while not requiring high-coercive force magnets that would include far more expensive rare earth materials, such as dysprosium.Index Terms-Flux-intensifying, interior permanent magnet (IPM), low coercive force magnet, variable magnetomotive force.

Section: Introductionmentioning

confidence: 99%

“…It is shown in [1] that small magnet widths can reduce the amount of rare earth metals used and also achieve a large reluctance torque due to the large saliency ratio. It is described in [2] that the permeance coefficient can be increased, and the total amount of magnet used can be reduced by applying flux-intensifying (FI) control.…”

Section: Introductionmentioning

confidence: 99%

Rare Earth Reduction Using a Novel Variable Magnetomotive Force Flux-Intensified IPM Machine

IEEE Trans. on Ind. Applicat.

Limsuwan

et al. 2014

“…Since low load, high speed conditions are a primary concern for EVs, it would be better if efficiency in low load, high speed conditions can be improved without losing maximum torque capability. It was shown in [1] that the small magnet width motor, which has large saliency ratio, can achieve both large maximum torque and high speed operation due to a large reluctance torque. However, it needs a large d-axis current to obtain large reluctance torque.…”

Section: Introductionmentioning

confidence: 99%

Design methodology for variable leakage flux IPM for automobile traction drives

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

Hijikata

Minowa

et al. 2014

This paper presents a novel methodology for the variable leakage flux IPM (VLF-IPM) motor taking advantage of variable leakage flux property in the rotor core controlled by q-axis current without any additional components. The fundamental phenomenon is explained with FEA results, then, the theoretical equations expressing variable flux linkage controlled by q-axis current have been conducted. The proofof-principle model was designed and the fundamental properties, such as torque-speed envelop and efficiency map, were evaluated. It was shown that the proposed motor can expand output power in the high speed region, and decrease energy consumption. I.978-1-4799-5776-7/14/$31.00 ©2014 IEEE

“…Several ideas have been reported for reducing rare earth usage [1][2]. It is shown in [1] that a small magnet width can reduce the amount of rare earth metals used and also achieve a large reluctance torque due to the large saliency ratio.…”

Section: Introductionmentioning

confidence: 99%

“…It is shown in [1] that a small magnet width can reduce the amount of rare earth metals used and also achieve a large reluctance torque due to the large saliency ratio. It is described in [2] that the permeance coefficient can be increased and the total amount of magnets used can be reduced by applying flux-intensifying (FI) control.…”

Section: Introductionmentioning

confidence: 99%

Rare earth reduction using a novel variable magnetomotive force, flux intensified IPM machine

2012 IEEE Energy Conversion Congress and Exposition (ECCE)

Limsuwan

et al. 2012

This paper presents a novel variable magnetomotive force, flux intensifying IPM (VFI-IPM) machine which uses only low coercive force magnets to reduce usage of rare earth metals.The VFI-IPM machine is designed with a characteristic of Ld>Lq, which is typical for FI-IPM machines, and uses low coercive force magnets with magnetization level control. A theoretical magnet operating point analysis was conducted to investigate the design methodology. A proof-ofprinciple prototype machine was then designed based on these principles.Simulation results show that the VFI-IPM prototype can achieve a wide torque-speed envelope and variable torque-speed characteristics, while not requiring high coercive force magnets that would include far more expensive rare earth materials, such as dysprosium. I.978-1-4673-0803-8/12/$31.00 ©2012 IEEE