Stepping motor with protruding pole teeth to increase detent torque
US5677581A · kind A · utility
10Cited by
2References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1995 |
| Grant date | Oct 14, 1997 |
| Priority date | — |
| Expiry date | Jun 15, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A stepping motor according to the present invention comprises a cylindrical permanent magnet on whose outer periphery N and S poles are alternately polarized, a rotatably-supported rotor, a plurality of stator cores having pole teeth arranged so as to face the permanent magnet, an exciting coil for rotating the rotor when the coil is turned on, and at least two protruded teeth serving as auxiliary poles which face the cylindrical surface of the permanent magnet so as to generate a detent torque when it is magnetized by the permanent magnet. And each of the protruded teeth faces the consecutive N an S poles of the permanent magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.