发明名称 |
Rare earth-based sintered magnet and permanent magnet synchronous motor therewith |
摘要 |
Disclosed is a rare earth-based sintered permanent magnet block used in the rotor of a permanent magnet synchronous motor. The magnet block of the form having an upper surface and a lower surface in parallel is provided in each of the upper and lower surfaces with at least one narrow slit having a specified incision depth, width and length so as to decrease the adverse influences of the eddy currents generated in the magnet block while the running direction of the slits in the upper surface and the running direction of the slits in the lower surface make an angle of at least 10 DEG or, preferably, 90 DEG so that the decrease in the bending strength of the magnet block due to the slits can be minimized without decreasing the desired eddy current-decreasing effect. |
申请公布号 |
EP1065777(A1) |
申请公布日期 |
2001.01.03 |
申请号 |
EP20000401703 |
申请日期 |
2000.06.15 |
申请人 |
SHIN-ETSU CHEMICAL CO., LTD. |
发明人 |
OHASHI, KEN |
分类号 |
H01F1/057;H01F7/02;H02K1/27 |
主分类号 |
H01F1/057 |
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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