发明名称 |
Radial anisotropic cylindrical sintered magnet and permanent magnet motor |
摘要 |
In a radially anisotropic sintered magnet of annular shape, the remanence in a radial direction of the annulus increases and decreases at intervals of 90° in a circumferential direction of the annulus, and the remanence in a radial direction over the entire circumference of the annulus has a maximum of 0.95-1.60 T and a minimum equal to 50-95% of the maximum. In a permanent magnet motor comprising a plurality of stator teeth, the radially anisotropic annular sintered magnet is incorporated after it is magnetized in 4n poles (wherein n is an integer of 1 to 20) so that the boundary between N and S poles is located within the range that is centered at the radial direction where the remanence exhibits the minimum and extends ±10° therefrom in a circumferential direction. The radially anisotropic annular sintered magnet undergoes neither fracture nor cracking during the sintering and aging/cooling steps even when it is shaped to a low inner/outer diameter ratio and has satisfactory magnetic properties. A permanent magnet motor comprising the radially anisotropic annular sintered magnet is inexpensive and of high performance.
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申请公布号 |
US7626300(B2) |
申请公布日期 |
2009.12.01 |
申请号 |
US20050589235 |
申请日期 |
2005.06.20 |
申请人 |
SHIN-ETSU CHEMICAL CO., LTD. |
发明人 |
SATO KOJI;MINOWA TAKEHISA |
分类号 |
H02K21/12;H01F1/08;H01F7/02;H01F41/02;H02K1/27;H02K15/03;H02K21/14 |
主分类号 |
H02K21/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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