Stepping motor and electronic apparatus

Details Stepping motor and electronic apparatus Stepping motor and electronic apparatus

2006-10-04

2008-11-11

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S257000

Reexamination Certificate

active

07449805

ABSTRACT:
A stepping motor includes a rotor having a cylindrical permanent magnet, ring-shaped first and second yoke units that are arranged so as to be mutually stacked along an axis of the rotor, and a pair of lid. Each of the first and second yoke units includes a ring-shaped exciting coil, an outer yoke that includes an outer cylindrical section that accommodates therein the exciting coil, a back face section, and magnetic pole teeth, and an inner yoke that is combined with the outer yoke and includes a ring-shaped ring section formed around the axis, and magnetic pole teeth that are arranged at fixed intervals while alternating at equal intervals in a noncontacting state with respect to the magnetic pole teeth of the outer yoke. The first and second yoke units are stacked while the back face sections thereof are in a mutual surface contact state.

REFERENCES:
patent: 6829011 (2004-12-01), Higuchi et al.
patent: 6909208 (2005-06-01), Suzuki et al.
patent: 7071593 (2006-07-01), Matsushita et al.
patent: 2005/0236914 (2005-10-01), Horiike
patent: 01055022 (1989-03-01), None
patent: H03-112356 (1991-03-01), None
patent: 2001-078419 (2001-03-01), None
patent: 2004-289961 (2004-10-01), None

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