New generation motor for energy saving

Sakap, Kazuto; Misu, Daisuke; Yuki, Kazuaki; Yasui, Kazuya; Hashiba, Yutaka; Takahashi, Norikazu

doi:10.1109/ipec.2010.5544591

Cited by 24 publications

(17 citation statements)

References 2 publications

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“…Therefore, the magnetizing current becomes the d-axis current in the new pole after pole changing. Also, the experimental results from a previous work [6], [7] have confirmed that the PM in the motor obtained using the magnetic analysis can be demagnetized and magnetized. Fig.…”

Section: Magnetization Characteristics Of the Motorsupporting

confidence: 64%

“…6 shows the magnetic properties of variable and constant magnetized magnets used in the model. The variable magnetized magnet that we have previously experimentally produced is a samarium cobalt (SmCo) magnet [7]. Therefore, it seems that the cost of the variable magnetized magnet may be same or less than that of a conventional SmCo magnet because the variable magnet has the potential to reduce the volume of the cobalt component.…”

Section: A Motor Model Used For Fem Analysismentioning

confidence: 99%

“…Liu et al performed magnetic-field analysis on a memory motor [5], and Sakai et al proposed a variablemagnetic-force motor in which the magnetic flux can be varied by demagnetization and remagnetization of a PM [6]- [9]. On the basis of analysis and experimental results, Sakai et al confirmed that the motor can vary the magnetic flux on the load [6], [7]. In addition, Sakai et al proposed permanent magnet motors that can vary the number of poles [10]- [12].…”

Section: Introductionmentioning

confidence: 99%

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Permanent magnet motor capable of pole changing for high efficiency

Sakai

Yuzawa

2013

2013 IEEE Energy Conversion Congress and Exposition

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To reduce energy consumption, we developed a technique that varies the number of magnetic poles in a permanent magnet (PM) motor. We propose a PM motor that can change the number of magnetic poles and produce two types of torque. When the motor operates with eight poles, it produces a PM torque at low rotational speeds. When the motor changes to four poles, it produces both PM torque and reluctance torque at high speeds. We explain the principle and basic characteristics of the motor by using a finite element method magnetic-field analysis, which consists of a PM magnetized by a pulse d-axis current of the armature winding. The results of our experiment show that the proposed motor reduces core loss by 49% and 33% under no-load and load conditions, respectively, and doubles the speed range of the motor.

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Section: Magnetization Characteristics Of the Motorsupporting

confidence: 64%

Section: A Motor Model Used For Fem Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Permanent magnet motor capable of pole changing for high efficiency

Sakai

Yuzawa

2013

2013 IEEE Energy Conversion Congress and Exposition

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“…Table 1. RS-PM motor specifications 6 show the magnetizations of the VMMs and CMMs, respectively, that are associated with changes from the PS-mode to the NS-mode. Here 1 pu is the rated current (current density = 4 A/mm 2 ), which shifts the phase of the current flow of the armature windings to magnetize the VMMs.…”

Section: Magnetization Characteristics Of the Reversible Salient Polementioning

confidence: 99%

Permanent Magnet Motor with Reversible Salient Poles and Variable Magnetic Force

Sakai

Matsuda

2017

IEEJ Journal IA

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To operate motors at a higher efficiency over a wider range of speeds, we have developed a technique that quickly reverses the salient poles in permanent magnet (PM) motors. With this technique, PM motors can change negative salient poles into positive salient poles by applying the magnetization of the PM. Furthermore, we discuss the combination of reversible salient poles with variable magnetic force to increase the efficiency of the motor under partial load. This paper proposes a novel PM motor that uses our proposed technique to reverse saliency and describes the principle of reversible pole saliency as well as the resulting motor characteristics. When the proposed motor operates with a negative salient pole, a higher torque is produced at low speeds; when the motor reverses to a positive salient pole, higher power and efficiency are produced at high speeds. These results confirm that the proposed motor can reverse the saliency direction of the pole and that this reversibility allows the motor to achieve high torque at low speeds and high power at high speeds. Consequently, the motor can operate over a wide range of speeds.

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“…Liu는 메모리 전동기에 자계 분석을 수행하였고 [4], 그리고 Sakai는 영구 자석의 감자 및 재자화에 의해 자속이 변화될 수 있는 가변 자기력 모터를 제안했다 [5]- [8]. Lee는 프라이자흐 모델링을 사용하여 극변환시 의 영구자석의 감자 전류 산정 및 특성 해석을 하였다 [9]- [10], Sakai는 실험 결과 및 분석에 의한 기초로 전동기 부하에 자속을 변화할 수 있음을 확인 했다 [5]- [6]. …”

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Characteristics Analysis of V Shape Pole Changing Memory Motor using Finite Element Method

김영현¹,

김수용²,

김정우³

et al. 2015

The Transactions of The Korean Institute of Electrical Engineer

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-The Permanent Magnet (PM) machine used at speed control using field-weakening control method. But the field-weakening current, which reduces the field flux for high speeds, causes significant copper and core losses. Therefore, this paper deals with the PM performance evaluations in a pole changing memory motor (PCMM). The PCMM can change the number of magnetic poles and produce two types of torque. When the motor operates with eight poles, it produces a magnetic torque at low rotational speeds. When the motor changes to four poles, it produces both magnetic torque and reluctance torque at high speeds. The paper explain the principle and basic characteristics of the motor by using a finite element method magnetic-field analysis, which consists of a PM magnetized by a pulse d-axis current of the armature winding. The results of our experiment show that the proposed motor reduces core loss by 10% and 55% under no-load and load conditions, and doubles the speed range of the motor.

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New generation motor for energy saving

Cited by 24 publications

References 2 publications

Permanent magnet motor capable of pole changing for high efficiency

Permanent magnet motor capable of pole changing for high efficiency

Permanent Magnet Motor with Reversible Salient Poles and Variable Magnetic Force

Characteristics Analysis of V Shape Pole Changing Memory Motor using Finite Element Method

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