日本AEM学会誌
Online ISSN : 2187-9257
Print ISSN : 0919-4452
ISSN-L : 0919-4452
28 巻 , 4 号
選択された号の論文の9件中1~9を表示しています
特集 ワイヤレス電力伝送
一般論文[学術論文]
  • 孫 浩, 竹本 真紹, 小笠原 悟司, 折川 幸司
    2020 年 28 巻 4 号 p. 288-299
    発行日: 2020年
    公開日: 2021/02/05
    ジャーナル フリー

     There are two types magnetic bearings in general, heteropolar-type magnetic bearing (Heteropolar-type MB) and homopolar-type magnetic bearing (Homopolar-type MB). For each type of magnetic bearing, it has its own disadvantage. Heteropolar-Type MB cost low because of the low usage of the magnet, but high iron loss decides it is difficult to be cooling down. Homopolar-type MB has a low iron loss and can be cooling down easily, but cost is high because of high usage of magnet and has a complex structure. In this paper, our research group focused on the problem and proposed a new Homopolar-Type MB structure unifying four C-shaped cores, which can suppress the iron loss with a low usage of magnet and can be cooling down easily. What’s more, we also considerate the influences by the change of the structure and proposed the optimal one. The excellent characters of the new type Homopolar-Type MB will be shown by 3D-FEA.

  • 森 直也, 正木 耕一, 田代 晋久, 脇若 弘之
    2020 年 28 巻 4 号 p. 300-305
    発行日: 2020年
    公開日: 2021/02/05
    ジャーナル フリー

     This paper proposes small size angle sensor with Vernier pattern. Angle sensors play an important role in improving the functionality and workability of machine tools, industrial robots and mounting equipment. In that situation, angle sensors are required to be smaller, have higher accuracy and have functional safety. In response to these requirements, the aim is to develop a magnetic angle sensor with a 30 mm diameter, 19 bit resolution and redundant system by using a new mechanism. A rotor with a copper foil pattern and a stator with a meander coil pattern are prototyped and evaluated for angle error. As a result, 19 bit resolution and ± 1° angle error was obtained. This showed the possibility of further miniaturization and higher accuracy of the sensor by using the Vernier pattern.

  • 修理 雄大, 若林 大輔, 岡 茂八郎, 榎園 正人
    2020 年 28 巻 4 号 p. 306-312
    発行日: 2020年
    公開日: 2021/02/05
    ジャーナル フリー

     In order to develop a high-efficiency, low-loss, small, high-power, high-speed rotating motor, it is necessary to accurately measure the magnetic properties of electrical steel sheets under PWM excitation. A shunt resistor is generally used for measuring magnetic characteristics, but non-contact current measurement is required. However, iron cores are used in commercially available current measurement sensors, and it is necessary to consider the effects of core characteristics on high-frequency currents. The authors are focusing on Rogowski coils and developing small current / magnetic field sensors specialized for motor and electrical steel sheet evaluation. In this paper, we make a prototype of Rogowski coil, and report on the evaluation of basic electrical characteristics and the results of application to the measurement of magnetic characteristics of electrical steel sheets under sinusoidal excitation and PWM excitation.

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