US 2006/0232144 A1 · Driving device

Abstract

A low-cost and high-output driving device compact in size and reduced in axial length. In a stepping motor as the driving device, a stator has a plate part, and first and second outer magnetic pole parts axially extend from the plate part. A rotor formed by a rotary shaft and a core each formed of a soft magnetic material is disposed between said first and second outer magnetic pole parts. The rotor has one axial end thereof rotatably supported in the plate part. A magnet is rigidly fitted on an outer periphery of the rotor and magnetized such that different poles circumferentially alternate. A top plate is rigidly secured to the respective foremost ends of the pole parts and rotatably support the other axial end of the rotor. The pole parts are engaged in a bobbin having a cover part covering the outer peripheral surface of the magnet. First and second coils are wound around the first and second outer magnetic pole parts via the bobbin axially between the magnet and the plate part.

Claims7

Dependent claims

A driving device comprising:

a stator having a base, and first and second outer magnetic pole parts axially extending from said base;
a rotor formed of a soft magnetic material, said rotor being disposed between said first and second outer magnetic pole parts and having one axial end thereof rotatably supported in said base;
a magnet rigidly fitted on an outer periphery of said rotor and magnetized such that different poles alternate in a circumferential direction;
a lid member rigidly secured to respective foremost ends of said first and second outer magnetic pole parts and rotatably supporting another axial end of said rotor;
a bobbin engaged with said first and second outer magnetic pole, said bobbin having a cover part covering an outer peripheral surface of said magnet;
a first coil wound around said first outer magnetic pole part via said bobbin at an axial location between said magnet and said base;
and
a second coil wound around said second outer magnetic pole part via said bobbin at an axial location between said magnet and said base.

5 more elements

Dependencies are inferred from the claim text.

Driving device

Life of this patent

Driving device

Life of this patent

Abstract

Claims7