| 摘要 |
PURPOSE:To increase the torque of a motor at the starting time and the output at the rated operating time by providing Hall elements at the neutral axial position on the outer periphery of a rotor and at the position displaced in reversely rotating direction, and selectively using them. CONSTITUTION:A starting Hall element 5-1 and a rated rotating time Hall element 5-2 mounted to be displaced by an angle in reversely rotating direction from the element 5-1 are disposed on the outer periphery of the rotor 7 made of a magnet of a DC motor, on which coils 3-a, 3-b are formed on a stator 2. A phase switching signal generator 12 is operated with a signal from the element 5-1 at the starting time to excite the coils 3-a, 3-b, and when the rotating speed detected by a detector 15 reaches the set value, the element 5-2 is switched by a Hall element selector 16 and operated. Accordingly, adequate operation can be performed even at both the starting time and the rated operating time. |
