| 摘要 |
PURPOSE:To shorten a time coming to stop a rotor, by providing a member of high permeability iron or the like confronting a rotor magnet, on a board with arranged driving coils. CONSTITUTION:In an inner diameter slot 10a on a printed board, a member 11 of high permeability of iron or silicon steel plate or the like confronting a rotor magnet 7 is provided by a bonding method or the like. In this manner, the member 11 of high permeability is provided on magnetic path, and so when conductive current to coils 10 is interrupted, then the rotating magnet 7 is attracted by each member 11, and detent torque is increased. As the result, a time coming to stop the rotating magnet 7 through the interrupted conductive current can be shortened. |
