| 摘要 |
PURPOSE:To reduce a leakage magnetic flux from a high energy magnet to a yoke by mounting the magnet on the inner periphery of the yoke and forming a stepwise difference between the both ends of the magnet and the yoke. CONSTITUTION:A cylindrical yoke 5 is bent in a central direction to form stepwise differences 5a, 5b, and an arcuate magnet mounts 5b is formed between the differences 5a and 5b. The shape of the mount 5b is an arcuate shape having a radius of curvature smaller than that of the yoke 5. A high energy magnet 4 which has a reduced thickness, a light weight and a strong coercive force is mounted on the mount 5b provided at the yoke 5, and an armature 6 is inserted to a space between the opposed magnets 4. Thus, the sufficient decrease in the leakage magnetic flux in an arrow A from the magnets 4 to the yoke 5 can be performed. |
