| 摘要 |
The present invention provides a field element core (1) with alleviated stress concentration in connecting portions. A field element core (1) has field magnet through holes (41, 42) and connecting portions (11). The field magnet through holes (41, 42) are circumferentially arranged in a circumferential direction (92) around a given direction (91), and are adjacent each other in the circumferential direction (92) to form pairs. Seen from the given direction (91), field magnet through holes (41, 42) forming the same pair both extend along a certain one direction (94) determined for each pair. A connecting portion (11) is provided between the field magnet through holes (41, 42) of the same pair, and has the ends (412, 422) as its sides (111, 112). The sides (111, 112) of the connecting portion (11) are curved in a concave shape as a whole. Specifically, seen from the given direction (91), a tangent (t (r13)) to the side (111) is along the direction (93) of extension of the connecting portion (11) only at a certain one position (r13) between both ends of the side (111). The same holds true for the side (112). |
