MOTOR AND DISC DRIVE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a technique that enables rigidity of a rotating portion to be improved and besides, deformation of a rotor hub to be suppressed.SOLUTION: A rotating portion 3A of a motor 11A comprises: a nearly cylindrical magnet 35A, a yoke 36A having a yoke cylindrical portion 361A arranged at a radial-direction outside of the magnet 35A; and a hub 33A having a hub cylindrical portion 332A arranged at a radial-direction outside of the yoke 36A and a disc placing portion 333A. A first radial gap 61A, a space in a radial direction between the magnet 35A and a yoke cylindrical portion 361A, has a tapered gap 611A whose portion ranging from an upper end to the center in a shaft direction is filled with an adhesive 80A and whose width in a radial direction becomes wider as the gap extends downward. Further the adhesive 80A is not included in a range from the lower end to the center in the shaft direction of a second radial gap 71A, the range being a space in the radial direction between the yoke cylindrical portion 361A and a hub cylindrical portion 332A. As a result, deformation of the hub 33A can be suppressed while rigidity of the rotating portion 3A is improved.