| 摘要 |
PURPOSE:To obtain self-starting means for a low-cost contactless DC motor with a simple construction and a small size. CONSTITUTION:This motor comprises a permanent magnet rotor having n- magnetic pole, a flux plate 12 made of a magnetic material located in opposite to the rotor, a Hall element 14 for detecting the rotation position of rotor magnetic pole, a coil 13 for giving a rotating force to a rotor magnetic pole during current application, and a notch formed at the position other than the position of Hall element of the flux plate and every position 360 deg./n far from the Hall position. When the rotor stops, the magnetic neutral point between magnetic poles is stopped at the position in opposite to the notch. At this time, the Hall element is always on the magnetic pole and not at the magnetic neutral point, so that the magnetism can be detected and the rotor can be rotated by applying the current to the coils. |
