Apparatus and method for sensing DC current in a conductor

Details Apparatus and method for sensing DC current in a conductor Apparatus and method for sensing DC current in a conductor

1993-06-01

1995-06-06

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324126, G01R 3302

Patent

active

054225663

ABSTRACT:
A non-contact DC current sensor has a housing in which a pair of cantilevered compliant armatures are mounted. In one embodiment, a single magnet is mounted to a free end of one armature portion, and a nonmagnetic mass of the same moment and weight is mounted at the free end of the other armature to compensate for gravitational forces. Strain gages are mounted adjacent the magnet and the nonmagnetic mass on the pair of armatures. The strain gages are connected in a circuit to generate an output caused by a Lorentz force. The circuit includes provision for static gravity compensation, and in one embodiment l/r compensation.

REFERENCES:
patent: 3801908 (1974-04-01), Van Ardel
patent: 4232265 (1980-11-01), Smirnov
patent: 4727321 (1988-02-01), Huschelrath
patent: 4841235 (1989-06-01), Hartings et al.
patent: 4848146 (1989-07-01), Bruno et al.
patent: 4866383 (1989-09-01), Taliaferro
patent: 4937521 (1990-06-01), Yoshino et al.
patent: 5221894 (1993-06-01), Herwig

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