Low magnetic signature motor system
US7141903B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2001 |
| Grant date | Nov 28, 2006 |
| Priority date | — |
| Expiry date | Dec 26, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/0141
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A low magnetic signature motor system (1) comprises a plurality of electric motors (2), a first shield (9) and a second shield (13). The electric motors are arranged with their associated magnetic moments (6, 7) forming a closed loop such that their net external magnetic field (5) is minimized The first shield comprises a material with a high electrical conductivity and substantially surrounds the electric motors such that the a.c. component of the magnetic field is reduced; and the second shield comprises a material with a high magnetic permeability and substantially surrounds the first shield such that the d.c. magnetic field is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.