Low magnetic signature motor system
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United States of America Patent
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Nov 28, 2006
Issued Date -
N/A
app pub date -
Oct 31, 2001
filing date -
Nov 15, 2000
priority date (Note) -
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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.
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