日本磁気学会論文特集号
Online ISSN : 2432-0471
ISSN-L : 2432-0471
早期公開論文
早期公開論文の4件中1~4を表示しています
  • 櫻井 将, 吉田 征弘, 田島 克文
    原稿種別: 本論文
    論文ID: 25TR901
    発行日: 2024年
    [早期公開] 公開日: 2024/12/18
    ジャーナル オープンアクセス 早期公開

      Drones have been used for limited purposes such as aerial photography and pesticide spraying, but now they are expected to be used for logistics and transportation. On the other hand, the drones are operated for a short time about 40 to 60 minutes, and they have a low payload weight of less than 10 kg. To improve these, the battery capacity can be increased, but the weight is also increased and the payload weight is decreased. So, improvement of the motor is necessary. This paper presented a novel outer-rotor-type permanent magnet (PM) motor with a segment-shaped rotor for high power density and low cost. It can be used a magnet flux effectively because it has backyoke iron, and improving output can be expected. However, the torque ripple is increased. So, the improvement of torque ripple is proved using an asymmetry rotor and Ferrite magnet.

  • 畠山 駿斗, 中村 健二, 大日向 敬, 有松 健司
    原稿種別: 本論文
    論文ID: 25TR902
    発行日: 2024年
    [早期公開] 公開日: 2024/12/18
    ジャーナル オープンアクセス 早期公開

      Variable inductors, consisting of magnetic cores, primary dc windings, and secondary ac windings, can control the effective inductance of the secondary ac windings by applying a primary dc current due to the magnetic saturation effect. Therefore, they are applicable as reactive power compensators in electric power systems. In a previous study, a novel orthogonal-core-type variable inductor with permanent magnets was proposed. The proposed variable inductor can regulate the effective reactive power from leading to lagging by controlling the primary dc current from positive to negative. Consequently, line voltage can be increased or decreased without using power capacitors. In this paper, first, the iron loss characteristics of prototype orthogonal-core-type variable inductors with permanent magnets are measured. Next, the RNA model is applied to calculate both the iron loss in silicon steel sheets and the eddy current loss caused by the flux penetrating through the sheets. As a result, it is revealed that the proposed RNA model can calculate iron loss accurately.

  • 深田 敏希, 羽根 吉紀, 中村 健二
    原稿種別: 本論文
    論文ID: 25TR903
    発行日: 2024年
    [早期公開] 公開日: 2024/12/18
    ジャーナル オープンアクセス 早期公開

      Variable flux memory motors achieve a wider operating speed range without the need for flux weakening control by regulating the magnetization of permanent magnets. To design these motors to have higher performance, a fast and accurate analysis method is required. Reluctance network analysis (RNA) can be applied to characteristic calculations of various electric machines, due to advantages such as a simple model, fast calculation, and easy coupling with external electric circuits and motion equations. This paper presents the results of calculating the dynamic characteristics of a variable flux memory motor using RNA.

  • 岩城 圭悟, 中村 健二
    原稿種別: 本論文
    論文ID: 25TR904
    発行日: 2024年
    [早期公開] 公開日: 2024/12/18
    ジャーナル オープンアクセス 早期公開

      Flux-modulated-type magnetic gears have attractive features, such as torque transmission without mechanical contact and a high torque density. However, most studies focus on steady-state characteristics, while the frequency characteristics of torque transmission remain unclear. This paper discusses a frequency response analysis for magnetic gears. The results reveal that the frequency characteristics exhibit a resonance frequency, and that torque ripple is not transmitted to the output rotor in high-frequency regions. Moreover, this paper presents a formulation of the frequency characteristics of magnetic gears by linearizing the relationship between the load angle and the transmitted torque. The linearized frequency characteristics mostly correspond with the results from nonlinear differential equations.

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