发明名称 |
Permanent magnet motor and rotor thereof |
摘要 |
Disclosed is a permanent magnet motor consisting of a rotor which is a multi polar-magnetized cylindrical permanent magnet such as a neodymium/iron/boron magnet, and a stator having a plurality of stator teeth. Different from conventional but expensive multi-radial orientation of the magnetic anisotropy, the cylindrical permanent magnet has a direction of orientation along a single diameter of the cylinder that is perpendicular to the cylinder axis when a definite relationship is held between the number of the multipolar magnetic poles and the number of the stator teeth. Even when using such a simple and inexpensive cylindrical permanent magnet as the rotor, high performance of the permanent magnet motor can be ensured with regard to a large induced voltage and small torque ripples. When such a rotor having an increased height is desired, two or more of the cylindrical unit permanent magnets each having a single diametrical orientation are coaxially stacked one on the other into a block in such a relative disposition that the directions of two adjacent cylindrical unit permanent magnets make a rotational displacement angle of 180° divided by the number of the unit magnets.
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申请公布号 |
US6262507(B1) |
申请公布日期 |
2001.07.17 |
申请号 |
US19990396420 |
申请日期 |
1999.09.15 |
申请人 |
SHIN-ETSU CHEMICAL CO., LTD. |
发明人 |
SATO KOJI;MINOWA TAKEHISA;MIYATA KOJI |
分类号 |
H02K1/27;H02K21/14;(IPC1-7):H02K21/00 |
主分类号 |
H02K1/27 |
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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