Electromagnetic dent remover with electromagnetic localized work coil

An electromagnetic working coil for supplying a predetermined region of concentrated electromagnetic flux comprising:

• a strip of conductive material spirally wound lengthwise into the shape of a coil having two annular end faces, one of said faces forming a stressing region annular face;
• an electrically insulating material interposed between adjacent convolutions of said coil to electrically insulate adjacent convolutions from one another;
• and,
• a first aperture extending inwardly from the face of said coil other than said stressing region annular face, toward said stressing region annular face such that a magnetic stressing region is formed in said stressing region annular face in alignment with said first aperture.

A dent removal head for an electromagnetic dent remover comprising:

• an electromagnetic coil comprising a strip of conductive material spirally wound lengthwise into the shape of a coil having two annular end faces, one of said faces forming a stressing region annular face;
• an electrically insulating material interposed between adjacent convolutions of said coil to electrically insulate adjacent convolutions from one another;
• and, a first aperture extending inwardly through the wall of said coil from the annular face of said coil other than said stressing region annular face toward said stressing region annular face such that a magnetic stressing region is formed in said stressing region annular face in alignment with said first aperture, said first aperture reducing the cross-sectional area of those ones of said adjacent convolutions in alignment with said stressing region and said first aperture to increase the current density in regions of said adjacent convolutions that are in alignment with said stressing region when an electrical current flows through said cylindrical coil;
• and,
• a non-conductive housing for supporting and maintaining said electromagnetic working coil in a predetermined position with respect to a working plane defined by said housing.

A dent removal head for an electromagnetic dent remover comprising:

• an electromagnetic working coil comprising a strip of conductive material spirally wound lengthwise into a tubular coil, said conductive material strip shaped to form a first annular surface having a protrusion over a predetermined portion thereof, said conductive material strip further shaped to form a second annular surface having a recess in a predetermined region thereof, said recess positioned so as to control the cross-sectional area of the conductive material strip forming said protrusion of said first annular surface;
• and electrical insulation material interposed between adjacent convolutions of said electrical coil;
• and,
• a non-conductive housing for supporting and maintaining said electromagnetic working coil in a predetermined position with respect to a working plane defined by said housing.