| 摘要 |
PURPOSE:To suppress decreases in starting torque and mean torque and to reduce torque ripples by mounting a magnetic piece near one armature winding of inner and outer windings substantially at the same mounting angle as that of a position detector. CONSTITUTION:A circular-arc magnetic piece 9 is mounted on a printed board 10 on which a Hall element 8 is mounted at the bore side of the Hall element 8. In case of an outer rotor motor, the radial mounting position of the piece 9 is effective to be mounted between the outer periphery of an armature core 3 and an armature winding 4 radially inside from the element 8, and an armature magnetic field is absorbed to the piece 9. |
