| 摘要 |
PURPOSE:To smoothly start by providing an auxiliary magnet in the special area of the outer peripheral edge of a stator, and adopting such construction as to always stop a boundary of a rotor in contact with the different pole of the magnet on a coil. CONSTITUTION:Coils 4 of triangular shpe in plane are equally disposed circumferentially on the yoke 5 of a stator 6. An auxiliary magnet 1 of small piece is mounted on the outer peripheral edge of the yoke 5. The magnet 11 is disposed at a position of a range Z formed by two linear lines A, B of radial direction passing the center of the stator 6 except on the lines A, B, where an angle formed between a radial linear line C passing the intermediate position between the adjacent coils 4 passing the center of the stator 6 and a radial linear line D contacted with the outside of any one of the coils disposed at both sides of the line C passing the center of the stator 6 is alpha, and a linear line for connecting the center of the stator 6 and the center of the coil 4 is E. |
