| 摘要 |
PROBLEM TO BE SOLVED: To provide a core for field element which can minimize reduction in the q-axis inductance.SOLUTION: A plurality of first non-magnetic materials 23 are provided at the circumferential end of each permanent magnet 10 around the axis of rotation, and extend radially from the end toward the outer peripheral surface 22. Two second non-magnetic materials 24 extend in the radial direction while facing one and the other first non-magnetic materials 23 in the circumferential direction, between one first non-magnetic material 23 provided on the other side of a pair of permanent magnets 10 out of one ends thereof adjoining in the circumferential direction, and the other first non-magnetic material 23 provided on one side of the permanent magnet 10 out of the other ends thereof. |
