Compact-sized permanent magnet type stepping motor
US4636668A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1984 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | Jul 5, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A compact-sized stepping motor including a laminated stator assembly provided on an inner periphery thereof with a plurality of stator poles, stator coils magnetically connected to the laminated stator assembly, and a rotor having a plurality of rotor poles opposed to the stator poles. The rotor has assembled therein a permanent magnet and is rotatably supported between housings. The upper and the lower housings are each provided with a disc-shaped locating portion engageable with the inner peripheries of the stator poles of the laminated stator assembly, and the center-alignment between the stators and the rotor is assured by the locating portions, so that an accurate phasic relationship can be obtained between the rotor and the stators. The laminated stator assembly has a non-magnetic member core plate and a plurality of stator plates laminated on opposite sides of the non-magnetic member core plate. The stator plates are laminated on the core plate such that they are substantially an integral stator plate, and thereafter, the stator plate is separated into stator pieces for each pole associated with the stator coils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.