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发明公开
CN101622772A 励磁系统 失效 - 权利终止

励磁系统
摘要：
本发明提供一种降低磁通密度的高次谐波分量的励磁系统。永久磁铁(20)在与旋转轴(P)平行的方向与第1磁性板(1、3)邻接。第1磁性板(1)具有第1和第2磁性体(10、12)以及第1和第2非磁性体(11、13)。第1磁性体(10)包括极中心在内在旋转轴方向与一个永久磁铁邻接。第1磁性体(10)、第1非磁性体(11)、第2磁性体(12)、第2非磁性体(13)按照该顺序沿以极中心为起始点以旋转轴为中心的周向配置。在把极对数设为Pn、把3以上的奇数设为i时，极中心侧的第2非磁性体(13)的端部(131)相对极间形成的夹角θ1为0＜θ1＜180/(i·Pn)，极中心侧的第1非磁性体(11)的端部(111)相对极间形成的夹角θ2为180/(i·Pn)≤θ2≤180·2/(i·Pn)。
摘要（英）：

This invention is directed to a field piece to reduce harmonic components of magnetic flux density. A permanent magnet (20) is in contacts with a first magnetic plate (1, 3) in a direction in parallel with a rotation axis (P). The first magnetic plate (1) is provided with first and second magnetic members (10, 12) and first and second non-magnetic members (11, 13). The first magnetic member (10) includes the pole center and is in contact with one permanent magnet in the rotation axis direction. The first magnet member (10), the first non-magnetic members (11), the second magnetic member (12) and the second non-magnetic member (13) are disposed in this order in a circumferential direction starting from the pole center as a start point and centering the rotation axis. If a pole logarithm (Pn) and a not less than three odd number (i) are given, an angle (theta 1) defined by an edge (131) of the second non-magnetic member (13) on the pole center side with respect to a pole gap is 0

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