Electromagnetic driving device with a movable permanent magnet
US5942832A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1998 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Jun 12, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K26/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A movable member of the present driving device comprises a magnetized part, or more than one magnetized parts having all the same direction of magnetization, which is perpendicular to the direction of movement. Each magnetized part is moving in at least two air-gaps of a closed magnetic circuit coupled with en energizing coil. The material of the magnetized parts has a linear demagnetization characteristic up to temperatures at least equal to 100.degree. C. and at least up to a negative value of the flux density equal, in absolute value, to 0.5 times the remanence of the magnetic material. The driving device is dimensioned so that the mean operating point of each magnetized part lies at a flux density value smaller than 0.5 times the value of the remanence of the magnetic material used. The volume of magnetic material can be substantially reduced for a given force or torque to be delivered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.