| 摘要 |
PURPOSE:To stop a motor at a point displaced from a dead pint by fixing and arranging a ferromagnetic substance member near a rotary yoke. CONSTITUTION:Through-holes, which house ferromagnetic substance members such as pins 17 and project the noses of the pins 17 toward the inside of a lower cover 11, are bored previously to the lower cover 11. The ferromagnetic substance pins 17 prevent a stop at a dead point of a magnet 1, and the ferromagnetic substance pins 17 are disposed at positions among split coils-that is, at every 45 deg. at machine angles to eight-split coil patterns shown in broken lines. The pins 17 can be arranged in displacement of less than + or -90 deg. at electrical angles in the circumferential direction at that time, and it is desirable to avoid the dead point that the pins are disposed at the positions of 180Xn (n=0, + or -1, + or -2,...) deg. as much as possible. |
