| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology capable of improving rotational accuracy of a motor.SOLUTION: A motor comprises: a shaft; a rotating section; a stator; and a housing. The rotating section includes: a magnet holder; a rotor magnet; and a spacer. The magnet holder, which is a press-molded product, includes: a magnet holder bottom portion extending in a direction orthogonal to a rotation axis; and a magnet holder cylinder extending from the outside, in a radial direction, of the magnet holder bottom portion downward in an axial direction. The rotor magnet is fixed to an outer peripheral surface of the magnet holder cylinder. The spacer has, at the center thereof, an opening where the shaft is inserted, and is fixed to an inner side, in the radial direction, of the magnet holder cylinder. An inner periphery of the magnet holder cylinder has: a first inner diameter cylinder; and a second inner diameter cylinder arranged below the first inner diameter cylinder in the axial direction. An inner diameter of the first inner diameter cylinder is shorter than that of the second inner diameter cylinder. An outer peripheral surface of the spacer in the radial direction comes into contact with the inner peripheral surface of the second diameter cylinder, and an inner peripheral surface of the spacer in the radial direction comes into contact with the outer peripheral surface of the shaft.SELECTED DRAWING: Figure 1 |
