FR2672725A1 - Improved comb for high or low voltage transformers and transformers including such combs - Google Patents

Abstract

The subject of the present invention is a comb made of insulating material consisting of a baton (1) equipped with studs (3) between which the windings or coils of the secondary will be wound. Application to all electrical voltage transformers.

Description

Advanced comb for high or low voltage transformers and transformer comprising such combs.

 The present invention relates to an improvement in the production of high or low voltage electric transformers, and more particularly to those comprising a central core on which is wound a winding forming the primary and around which is a second winding forming the secondary, said windings being isolated from each other by means of one or more notched spacers called "comb".

 The invention applies more particularly to the aforementioned electrical transformers whose secondary is arranged concentrically with the primary and at a certain radial distance so as to leave a sufficient space between said windings in order to facilitate the cooling of the assembly. Such transformers generally include a secondary consisting of a number of windings.

 The windings are arranged on insulating spacers fixed on the periphery of the winding forming the primary, and are insulated from each other so as to form several windings, with their connections, commonly called "pancakes". A wafer is therefore part of the secondary, made up of a certain number of turns of wires. These pancakes are separated and isolated from each other.

 Currently for the production of such wafers, a number of notched spacers (six, eight or more) of insulating material are arranged on the central core which have been machined beforehand in order to obtain more or less wide recesses. and deep; these spacers by their configuration are called "comb". The spacers or "combs" being arranged and glued, the thread is wound to form the windings called "pancakes".

 The main drawback of this embodiment is the high cost of machining the spacer, the recesses of which are obtained by milling.

The present invention remedies this drawback by making a comb consisting of a rod, made of fiberglass, of rectangular section, comprising a certain number of holes.
along its length, into which cylindrical nipples are forced into place.

 According to the invention, a high or low voltage electric transformer is produced comprising a primary, around which rods are placed and fixed in which cylindrical nipples have been introduced into the terminal orifices provided for this purpose, so as to form a comb, between which the secondary wire will be wound, so as to produce pancakes.

The invention will be better understood on reading the description which follows and on examining the accompanying drawing in which
Figure 1 is a perspective view, partially exploded, of a comb according to the invention.

 Figure 2 is a schematic perspective view of a transformer comprising a comb according to the invention.

Referring to Figure 1 we see in perspective a comb made according to the invention. It consists of an insulating rod 1 made of resin or glass fibers, of rectangular section. This
or baguette taps 1 has a number of smooth holes 22 2a, 2b, ... 2n intended to receive nipples 3. In the example shown these nipples 3 are cylindrical but they can have a different configuration: square, oval etc. ..

The blind holes 2 can be regularly spaced as shown, but they can also have variable spacings in order to achieve suitable dielectric isolation. Of course, it is also possible to put a pin 3 in every second or third hole when the said holes are regularly spaced. The nipples 3 are forced into the blind holes 2.

 In Figure 2 there is shown schematically a transformer 4 produced with the comb according to the invention. It comprises a central core 5 on which a primary 6 is wound. On this primary produced in a known manner, eight rods or combs 1 according to the invention are arranged by way of example. These combs 1 are fixed to the primer, at its periphery, by gluing or any other means. Each comb 1 has pins 3 between which are wound the turns forming the wafers 7 constituting the secondary 8.

It should be noted that the pins 3 can be placed before the assembly of the rods 1 or if this is preferable after fixing the rod on the primary 6.

The production of this comb according to the invention is of very minimal cost since it requires practically no machining unlike those used until now.

Of course one can imagine other fromes of a different configuration without departing from the scope of the present invention. Likewise, the invention can be applied to high and low voltage transformers.

Claims (4)

 1. Improved comb for high or low voltage transformers characterized in that it consists of a rod (1) made of insulating material provided with pins (3).  2. Improved comb for high or low voltage transformers according to 1 characterized in that the rod (1) constituting it is provided on one side with a certain number of holes (2, 2a, ... 2n).  3. Improved comb for high or low voltage transformers according to 1 characterized in that which pins (3) are forced into the blind holes (2).  4. A process for producing a high or low voltage transformer comprising a primary (6) and a secondary (8) consisting of a plurality of windings or wafers (7) characterized in that said wafers (7) are wound and isolated from each other by means of a plurality of combs (1) carrying pins (3) according to claims 1 to 3.