| Project/Area Number |
24656180
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Power engineering/Power conversion/Electric machinery
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| Research Institution | Tohoku University |
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Principal Investigator |
NAKAMURA Kenji 東北大学, 工学(系)研究科(研究院), 准教授 (70323061)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 永久磁石モータ / 省レアアース / 電気自動車 / 省レアアースモータ / Sm-Fe-Nボンド磁石 / アウターロータモータ |
|---|
| Research Abstract |
In 2012, we examined the optimum configuration of an outer rotor type surface permanent magnet (SPM) motor using a polar anisotropic Sm-Fe-N bonded magnet by using finite element method (FEM). As a result, it was clear that the proposed SPM motor exhibits the same torque as a conventional Nd-Fe-B sintered magnet motor when the number of pole-pairs is increased up to 40 while keeping a ratio of width and length per one magnet 2:1.
In 2013, to further increase the torque, we investigated an interior permanent magnet (IPM) structure. As a result, it was clear that the proposed IPM motor demonstrates 1.2 times larger torque than a conventional Nd-Fe-B sintered magnet motor, when the IPM rotor has two-layer flux-barrier structure which has small amount of Nd-Fe-B sintered magnet in the first layer, while the large amount of ferrite magnet (it has less flux density than Sm-Fe-N bonded magnet) in the second layer.
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