Rotating source for generating a magnetic field for use with a c

Details Rotating source for generating a magnetic field for use with a c Rotating source for generating a magnetic field for use with a c

1992-08-19

1994-05-24

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324235, 324262, 335306, 340551, G01N 2772, G01R 3312, G01R 3306, H01F 702

Patent

active

053152468

ABSTRACT:
The invention in one embodiment utilizes a pair of identical high energy permanent magnet dipoles mounted on parallel rotatable shafts. The magnetic dipoles lie in a plane perpendicular to the rotatable shafts, and the shafts are coupled to a drive motor for rotation in opposite directions. The magnetic dipoles gives rise to a resultant field which is the sum of the fields due to the individual dipole magnetic moments. With the dipoles aligned, a field having only a longitudinal component is generated, "longitudinal" being defined as being along the direction of initial alignment. The longitudinal components of the two dipoles add, being in the same direction, while the transverse (i.e. perpendicular to the longitudinal direction) components of the dipole cancel, as they point in opposite directions. In the region of space adjacent to the longitudinally defined direction, the longitudinal oriented field components still add, and the transverse components substantially, if not completely, cancel. As the magnetic dipoles counter rotate, the longitudinal components of the dipoles continue to add while the transverse components continue to subtract, giving rise to a uniaxial, sinusoidally varying magnetic field with a frequency equal to the rotational frequency of the dipoles. A second embodiment discloses the use of two pairs of counter rotating dipoles configured to generate a uniaxial, sinusoidally varying magnetic field. Also disclosed is the use of this alternating uniaxial magnetic field source in a system for the detection of currency or other magnetic material.

REFERENCES:
patent: 2897438 (1959-07-01), Fearon
patent: 3015063 (1961-12-01), Ownby
patent: 3359495 (1967-12-01), McMaster et al.
patent: 4066962 (1978-01-01), Jaffe
patent: 4114804 (1978-09-01), Jones et al.
patent: 4458143 (1984-07-01), Gitlis
patent: 4668913 (1987-05-01), Vinal
patent: 4764725 (1988-08-01), Bryce
patent: 5136239 (1992-08-01), Josephs

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