Inductor devices – Plural part core
Patent
1998-03-17
1999-12-14
Gellner, Michael L.
Inductor devices
Plural part core
336216, 336217, 336221, 336234, 102402, 89 113, H01F 2724
Patent
active
06002321&
DESCRIPTION:
BRIEF SUMMARY
The technical scope of the present invention is that of coils used in demining operations.
Demining devices are known notably by patents DE3444037 and FR2701105 which implement at least one induction coil powered by an electric circuit.
Known devices generally used substantially plane coils with no core.
Indeed, this technology enables coils to be placed directly on a tank glacis thus limiting the disturbances to the magnetic field that the mass of the tank could generate.
However, these coils have one main drawback in that they are very heavy (the usual mass of a demining coil is of 80 kg), and the field generated remains of a relatively small amplitude (around 5 micro tesla at 5 m).
Moreover, the magnetic field generated is essentially oriented along a single axis (the axis of the coil) thereby reducing the effectiveness of the demining device.
A first aim of the invention is to propose a demining coil whose size is reduced and whose effectiveness is improved with respect to known coils.
A further aim of the invention is to propose a demining device implementing one or several of these demining coils, a device whose effectiveness is greater than that of known demining devices.
Thus, the subject of the invention is a demining coil intended in particular to be made integral with a demining vehicle, a coil characterized in that it incorporates a magnetic laminated or fluted core to restrict the eddy currents and in that the ratio of length to the largest transversal dimension of the core of the coil is greater than or equal to 4.
The constitutive material of the magnetic core will preferably have a relative permeability greater than or equal to 100 and a saturation induction greater than or equal to 2 tesla.
The demining coil can be surrounded by a protective casing made of a non-magnetic and non-conductive material.
According to another characteristic of the invention, the coil can incorporate a linking means intended to enable its fastening onto a support placed at a front part of a demining vehicle, the linking means being formed so as to allow an angular displacement of the coil axis with respect to the support.
Thus, the linking means can incorporate a base having at least two fastening systems separated by a part made of a flexible synthetic material.
According to another embodiment, the linking means can incorporate at least two elastic shims, arranged between the coil and the protective casing, shims which ensure flexible positioning of the coil substantially level with the casing axis.
According to another embodiment, the linking means can incorporate at least three concentric rings, pivots being provided between a middle ring and the two other rings, pivots positioned so as to allow the inner ring carrying the coil to pivot in along at least two orthogonal axes.
A further subject of the invention is a demining device implementing at least three coils and characterized in that the coils are fastened onto a support placed on a front part of the demining vehicle, the coil axes being spaced so as to form two by two at least two non parallel planes.
According to another embodiment, the coils are fastened onto a support placed on a front part of the demining vehicle, and the coil axes are spaced along at least two different directions.
The coil axes can be spaced along at least three different directions.
The invention will be better understood after reading the following description of the different embodiments, description made with reference to the annexed drawings in which:
FIG. 1a shows a longitudinal section view of a demining coil according to a first embodiment of the invention,
FIG. 1b is a transversal view of this coil along the plane referenced AA in FIG. 1a,
FIG. 2a shows a longitudinal section view of a coil according to a second embodiment of the invention,
FIG. 2b is a transversal section view of this coil along the plane referenced BB in FIG. 2a,
FIG. 3a shows a longitudinal section view of a according to a third embodiment of the invention,
FIG. 3b is a transversal section view of this
REFERENCES:
patent: 3417382 (1968-12-01), Snyder et al.
patent: 3707913 (1973-01-01), Lee
patent: 4993325 (1991-02-01), Slone, Jr. et al.
patent: 5001485 (1991-03-01), Jones
patent: 5458063 (1995-10-01), Laine et al.
Gellner Michael L.
Giat Industries
Nguyen Tuyen
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