Winding – tensioning – or guiding – Composite article winding – By rotating core
Patent
1997-08-07
1999-08-03
Matecki, Katherine
Winding, tensioning, or guiding
Composite article winding
By rotating core
140 922, 2424473, H01F 4102
Patent
active
059314044
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to the winding of electric coils, such as high voltage transformer coils. The present invention more specifically aims at a specific winding enabling to avoid insulation problems between two adjacent windings of two successive layers.
BACKGROUND OF INVENTION
An electric coil generally includes axial winding layers, that is, each layer includes windings wound next to one another parallel to the coil axis. Most often, the coil includes many more windings in the axial direction than in the radial direction.
A disadvantage of such a coil is that two adjacent windings of two successive layers can be separated by a large number of turns, so that they are submitted to a voltage differential which is too high for the insulator of the windings, generally an enamel. Insulator layers thus have to be interposed between the layers of windings, which makes the coil more bulky and its fabrication more complex.
To avoid this disadvantage, in European patent application 0518737, it is provided to wind the windings in oblique layers. A coil obtained by this method has the disadvantage of being bulky since it has a trapezoidal cross-section which necessarily implies that the external diameter of the coil is larger, for a given number of windings, than that of a coil with a rectangular cross-section. The bulk of the coil is further increased by the fact that it includes a large number of crossing windings which hinder a contiguous disposition of the windings.
Due to the many winding crossings, this winding method is not applicable to conductors with a large diameter or a rectangular cross-section.
SUMMARY OF INVENTION
A device for winding coils including a plurality of layers of windings wound around an axis, the layers being radial and wound alternately from an inside to an outside and from the outside to the inside, including: internal and external winding guides distributed in a plane of a layer of windings being wound; means for enabling the external guides to be retracted from an engaged position with the internal guides so as to follow the external diameter of a layer being wound from the inside to the outside, and the internal guides to be retracted from an engaged position with the external guides so as to follow the internal diameter of a layer being wound from the outside to the inside; a fixed guiding means to bring a conductor to be wound into the plane of the winding guides and to hold a first surface of the layer being wound; and a shifting mechanism for axially shifting a completed layer into a hopper at the side opposite the guiding means.
An object of the present invention is to provide a coil with a low bulk and avoiding insulation problems between two adjacent windings of successive layers.
To achieve this object, the present invention provides a coil including a plurality of layers of windings wound around an axis, the layers being radial and wound alternately from the inside to the outside and from the outside to the inside.
According to an embodiment of the present invention, the coil conductors have a rectangular cross-section.
According to an embodiment of the present invention, the main axis of the rectangular cross-section of the conductors is perpendicular to the coil axis.
According to an embodiment of the present invention, the coil conductors have a circular cross-section, each layer including the same number of windings as the preceding layer and being radially shifted with respect to the preceding layer by one conductor half-diameter.
According to an embodiment of the present invention, each winding of the coil includes several conductors in the plane of the associated layer.
The present invention also aims at a device for winding coils of the above-mentioned type. The device includes internal and external turning guides distributed in the plane of a layer of windings being wound. The external guides are retractable from an engaged position with the internal guides so as to follow the external diameter of a layer being wound from the insid
REFERENCES:
patent: 1813994 (1931-07-01), George
patent: 2263500 (1941-11-01), Hutchinson et al.
patent: 2930014 (1960-03-01), Van Der Hoek et al.
patent: 3216671 (1965-11-01), Rahn
patent: 3750719 (1973-08-01), Goldman et al.
patent: 5167063 (1992-12-01), Hulsink
Matecki Katherine
Plevy Arthur L.
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