| 摘要 |
PROBLEM TO BE SOLVED: To provide a linear motor which can sufficiently lower a cogging force. SOLUTION: A magnetic pole row 13 is composed of first to ninth permanent-magnetic poles P1-P9. In the central permanent-magnetic poles P2-P8 in its shifting direction, linear dimensions L in the shifting direction D1 are fixed. In the first to ninth permanent-magnetic poles P1 and P9, the linear dimensions in the shifting direction D1 are changed in its orthogonal direction D3. At each of the first to ninth permanent-magnetic poles P1 and P9, the total value of the linear dimensions in its shifting direction D1 of specified two points positioned in its orthogonal direction D3 is made equal to the linear dimension L of the central permanent-magnet MC in its shifting direction. The total value of the linear dimension of the first permanent-magnetic pole P1, and the ninth permanent-magnetic pole P9 that are measured in its shifting direction and that along a virtual line I accompanying the first to ninth permanent-magnetic poles P1 and P9 is made equal to the linear dimension L of the permanent magnet MC. The linear dimension of the first permanent-magnetic pole is expressed as k×L, and k at the time of k<(1-k) is determined to a value in a range of 0.25 to 0.4. COPYRIGHT: (C)2008,JPO&INPIT
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