Patent ID: 8344561
Filing Date: 2013-01-01
Classification: H02K

Abstract:
1. A stepping motor comprising: a rotor having a drive magnet; and a stator having a drive coil, the drive coil being wound in a tube shape and disposed on an outer peripheral side of the drive magnet; wherein the stator comprises: wherein one end face in the axial direction of the drive magnet is disposed between a first base end part that is a base end part of the first pole tooth that is formed at a boundary part, and a second tip end part of the second pole tooth, wherein said boundary part is defined between the first end plate part and the first pole tooth in the axial direction; wherein the other end face in the axial direction of the drive magnet is disposed between a second base end part that is a base end part of the second pole tooth that is formed at a boundary part and a first tip end part of the first pole tooth, wherein said boundary part is defined between the second end plate part and the second pole tooth in the axial direction; wherein the first tip end part and the second tip end part are formed in a convex curved shape; and wherein a distance between the one end face of the drive magnet and the first base end part in the axial direction is shorter than a distance between the one end face of the drive magnet and the second tip end part in the axial direction, and a distance between the other end face of the drive magnet and the second base end part in the axial direction is shorter than a distance between the other end face of the drive magnet and the first tip end part in the axial direction.