Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Eccentrically pivoted coil
Patent
1978-07-31
1981-06-30
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Eccentrically pivoted coil
G01R 508
Patent
active
042765110
ABSTRACT:
A magnetic system for a long scale electrical meter enables four sided sensing of a coil which is completely offset from the axis of rotation has a cylindrical core pole piece magnetically coupled to first similar poles of two magnets. The core is surrounded by an inner annular air gap defined by a coaxial inner annular pole piece which is magnetically coupled to the second poles of the magnets. Radially outward is an outer annular air gap defined by a coaxial outer annular pole piece which is magnetically coupled to the first magnetic pole. Magnetic fields in the inner and outer air gaps are radial. The outer annular pole piece is closed at opposite ends by a pair of magnetically permeable discs which also are pole pieces for the first magnetic pole. Each disc is spaced apart a distance D from the nearest flat face of the inner annular pole piece to provide axial magnetic fields. Accordingly, all four sides of the coil are active.
A system for three sided sensing is similar but has one magnet and no core piece. Each of two pole pieces has a straight leg section and an annular section. The magnet is positioned between the adjacent but spaced apart leg sections, and the annular sections are concentric to form an annular air gap in which the coil moves. The outer annulus is wider than the inner one, and its flat side faces on both sides are closed by magnetically permeable discs which are equispaced from the side (radially oriented) faces of the inner annular pole piece to provide axial fields.
REFERENCES:
patent: 3155906 (1964-11-01), Roper
patent: 3181065 (1965-04-01), Bajars
patent: 3332013 (1967-07-01), Higley et al.
patent: 3395349 (1968-07-01), Bajars
patent: 3490043 (1970-01-01), Faria
patent: 3569832 (1971-03-01), Marusek
patent: 3962633 (1976-06-01), Nadeau
patent: 4002978 (1977-01-01), Townorow et al.
Gaudier Dale V.
Ishimaru Mikio
Kaliko Joseph J.
Sangamo Weston, Inc.
Strecker Gerard R.
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