Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate
1998-08-24
2001-05-08
Snow, Walter E. (Department: 2862)
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
C324S232000
Reexamination Certificate
active
06229305
ABSTRACT:
BACKGROUND ART
The disclosed polar sensor embodiments utilize rotating magnetic field concepts taken from Tesla Patent Nos. 381,968 May 1, 1888 382,279 May 1, 1888 382,280 May 1, 1888, 390,414 Oct. 2, 1888 390,721 Oct. 9, 1888.
It has been stated in Logue patent no. 5,754,043 col. 4, lines 39-42, a polar sensor driving core is “similar to poly-phase induction motor stator designs for generating rotating magnetic fields.”.
Further it has been stated in the cited copending patent Ser. No. 09/023,516 page 1, last paragraph: “The present invention utilizes rotating field stator structure concepts originating with Tesla e.g. all poly-phase induction motor stator designs”.
A dual driving core sensor was disclosed in the cited Logue patent no. 5,754,043
FIGS. 10
,
11
, col. 5, lines 1-67, and further in col. 6, lines 1-7, which had the capability of generating an “lactive flux helix” in the pick-up core in response to phasing differences between the two interacting driving fields.
SUMMARY OF THE INVENTION
The unique high amplitude low noise signals recorded in copending patent Ser. No. 08/832,100
FIGS. 16-20
are now believed to be generated by a helical magnetic path (a flux helix) inherent in the polar sensor outer pole element
84
,
184
,
284
. The subject helical flux path will be diagrammatically mapped to show a shortened effective flux length coupling the pick-up coil.
A “flux helix” may be induced within the pick-up structure by passive and/or active inductive elements. Firstly, a copper washer concentric around the sensing face (also called the extending portion) of the pick-up core. Secondly, stacking (at least two) driving toroids with a spatially fixed angular phase difference between each. Digital computer synthesis sine-cosine excitation generators further expand the utility of stacked toroid driving cores, providing full phase control of flux helicity, controlling the resultant effective length of the “imbalance flux” coupling the pick-up coil.
REFERENCES:
patent: 5939880 (1999-08-01), Logue
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