Laminated figure 8 power meter core

Details Laminated figure 8 power meter core Laminated figure 8 power meter core

1996-04-25

1997-12-02

Gellner, Michael L.

Inductor devices

With closed core interrupted by an air gap

336178, 336175, 336188, 324117H, 324142, H01F 1706, H01F 2728, G01R 3300, G01R 700

Patent

active

056941030

ABSTRACT:
An improved laminated ferromagnetic FIG. 8 power meter core is provided. The core is fabricated from a plurality of ferromagnetic plates and is formed in the general shape of a FIG. 8. The central leg of the core has a cross-sectional area that is larger than the cross-sectional area of other parts of the core. The core gap, in which a Hall-effect sensor is located, has gap faces with chamfered or rounded over edges to reduce fringing and bypassing effects. The core is formed without discontinuous corners that can result in local saturation and, in use, accommodates electrical power conductors in an over-under looping relationship through the openings of the core to provide a more homogeneous magnetic flux within the core and thus more reliable metering. The overall result is a core with a higher saturation point and thus a wider dynamic range than prior art cores.

REFERENCES:
patent: 4491790 (1985-01-01), Miller
patent: 5027059 (1991-06-01), De Montgolfier et al.
patent: 5338996 (1994-08-01), Yamamoto
patent: 5523677 (1996-06-01), Kawakami et al.

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