Stator assembly for stepping motor
US4336471A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 1980 |
| Grant date | Jun 22, 1982 |
| Priority date | — |
| Expiry date | Oct 24, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/125
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The efficiency of a stepping motor is increased by using a stator assembly comprising (a) a magnetically permeable first stator member having a central hub and multiple, spoke-like pole pieces radiating from the hub and (b) a stator bridge assembly in which a plastic holder member is united to a magnetically permeable second stator member having a central hub and radiating pole pieces in spaced, overlapping relation to the hub and pole pieces of the first stator member. The plastic holder member includes thermoplastically worked portions which form a bushing in a central aperture in the hub of the second stator member to rotatably receive one end of the rotor axle while the other end of the rotor axle extends through an axially aligned central aperture in the hub of the first stator member. Other portions of the plastic holder member form a support bridge between the first and second stator members. Overlapping of extraneous areas of the first and second stator members not associated with the hub and pole pieces is eliminated to reduce magnetic losses in the stator circuit. The stator assembly thus provides a stable bridge for rotor pivoting with minimized magnetic losses, resultin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.