| 摘要 |
PURPOSE:To prevent magnetic detectors from detecting leakage magnetic fluxes from a core and improve the efficiency of a brushless motor and, at the same time, to reduce noise and torque ripples. CONSTITUTION:This motor is provided with driving magnets 1 which are arranged so that their driving magnetic poles are alternately magnetized in N- and S-poles, driving coils which are counterposed to the magnets 1, and magnetic detectors Hu, Hv, and Hw which detect the magnetic fields of the magnets 1. Closed magnetic paths are respectively formed between in-phase paired coils (u), (v), and (w) by arranging in-phase driving coils U, U, W, W, V, and V two coils by two coils in the order of phase and making the angles B between the centers of each adjacent in-phase paired coils (u), (v), and (w) coincident with the angle between the magnetic poles of the magnets 1 and, at the same time, making the directions of the magnetic fields generated by the in-phase paired coils (u), (v), and (w) opposite to each other and the detectors Hu, Hv, and Hw are positioned outside the closed magnetic paths. |
