Stepping motor and electronic apparatus
US7449805B2 · kind B2 · utility
Assignees
Inventor
Key dates
| Filing date | Oct 4, 2006 |
| Grant date | Nov 11, 2008 |
| Priority date | — |
| Expiry date | Oct 4, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.