著者

藤井 信男 小川 幸吉 千田 誠

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.117, no.6, pp.768-775, 1997-05-20 (Released:2008-12-19)

参考文献数

9

被引用文献数

1 2 1

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The authors had proposed the revolving permanent magnet type magnetic wheel called the “magnet wheel”, which have both functions of induction repulsive type magnetic levitation and thrust. In this paper, the relation between magnetic poles and lift force or thrust characteristics is examined to grasp the performance. Five types of magnet wheels are discussed in the experimental study and four more types are used in the theoretical study with the three-dimensional numerical analysis. The following parameters are considered, they are magnetomotive force (mmf) of permanent magnet, thickness of magnet in magnetizing direction and the total volume of magnets, fundamental factor and distortion factor of the space mmf distribution of poles, pole pitch, diameter of magnet wheel, mechanical clearance, thickness and resistivity of conducting plate, etc. The result cleared the following. 1. The lift force per magnet volume is nearly proportional to the fundamental factor of space mmf distribution of pole. The low degree space harmonic mmf is effective to increase lift force. 2. The driving power per lift force is almost independent of configuration of the primary member including pole arrangement and position against the secondary conducting plate respectively, and only depends on the resistance of conducting plate. 3. In both the “partial overlap type” and “tilt type” magnet wheels, many number of poles with the sufficiently large pole pitch is useful. In the tilt type the use with a small tilt angle is desirable.

著者

坂本 泰明 柏木 隆行 田中 実 長谷川 均 笹川 卓 藤井 信男

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.129, no.3, pp.342-349, 2009-03-01 (Released:2009-03-01)

参考文献数

17

被引用文献数

5 6

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One type of braking system for railway vehicles is the eddy current brake. Because this type of brake has the problem of rail heating, it has not been used for practical applications in Japan. Therefore, we proposed the use of a linear induction motor (LIM) for dynamic braking in eddy current brake systems. The LIM reduces rail heating and uses an inverter for self excitation.In this paper, we estimated the performance of an LIM from experimental results of a fundamental test machine and confirmed that the LIM generates an approximately constant braking force under constant current excitation. At relatively low frequencies, this braking force remains unaffected by frequency changes. The reduction ratio of rail heating is also approximately proportional to the frequency. We also confirmed that dynamic braking resulting in no electrical output can be used for drive control of the LIM. These characteristics are convenient for the realization of the LIM rail brake system.