Magnetic and electric field shield
AssigneeElectronic Development, Inc.
InventorWesley A. Rogers
Life of this patent
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Abstract
A magnetic field and electric field shield having an electrically conductive layer and two layers of thin, soft magnetic material wrapped in opposite directions about a common axis. One layer of magnetic material is wrapped in a clockwise direction and the other layer of magnetic material is wrapped in the counter clockwise direction. The electrically conductive layer is grounded and provides a barrier to electric field penetration. The two layers of magnetic material oppositely wrapped provide a barrier to magnetic field penetration. An outer wrapping of material may be used to secure the magnetic wrappings in place. The shield is applicable to electric devices, in particular electrical wires and cables for automotive vehicles and other high current discharge operations.
Claims32
A magnetic and electric field shielded electrical structure comprising:
- an electrical structure having a longitudinal axis;
- a first layer of electrically conductive material surrounding the electrical structure in electrical isolation therewith;
- a first layer of magnetic material surrounding the electrical structure, the first magnetic material layer being wrapped around the electrical structure in one of a clockwise and counter-clockwise direction with overlapped edges to form a helical path along the longitudinal axis of the structure;
- and
- a second layer of magnetic material wrapped around the first layer of magnetic material in the other of the clockwise and counter-clockwise directions with overlapped edges to form a helical path along the longitudinal axis of the structure, the first and second layers being connected at one end.
A method of forming an electric and magnetic field shield for an electrical structure having a longitudinal axis comprising the steps of:
- a) wrapping a first layer of magnetic material in one of a clockwise and counter-clockwise directions along the longitudinal axis of an electrical structure to form a first helical wrap with overlapping edges;
- b) wrapping a second layerof magnetic material over the first layer of magnetic material in the other of a clockwise and counter-clockwise directions along the longitudinal axis of the electrical structure to form a second helical wrap with overlapping edges, the first and second helical wraps being in opposite directions and forming a magnetic field shield;
- and
- c) providing the electrical structure with a first layer of electrically conductive material in electrical isolation therewith and connected to ground forming an electric field shield.
A method of shielding an electrical wire having a longitudinal axis from electrical and magnetic fields comprising the steps of:
- surrounding an electrical wire with an electrically conductive layer of material in electrical isolation therewith;
- connecting the electrically conductive layer of material to ground;
- providing a first layer of magnetic material wrapped around the electrically conductive layer in one of a clockwise and counter-clockwise direction along the longitudinal axis of the electrical structure;
- and
- providing a second layer of magnetic material wrapped over the first layer of magnetic material in the other of clockwise and counter-clockwise directions along the longitudinal axis of the electrical structure.
Dependencies are inferred from the claim text.