Electric stepper motor
US4517478A · kind A · utility
17Cited by
4References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 3, 1984 |
| Grant date | May 14, 1985 |
| Priority date | — |
| Expiry date | Apr 3, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/125
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric stepper motor of the type comprising an axially magnetized rotor disc and a plurality of elemental magnetic stator circuits is disclosed. Each elemental circuit is formed of two U-shaped portions arranged opposite each other, one of each U being in contact with the opposite U-end and the second U-end being spaced from the opposite one to form an air gap for the rotor disc, the centers of the ends forming the airgap being angularly shifted with respect to each of the U-ends in contact with each other so as to compensate the third and/or fifth harmonics in the torque due to the driving current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.