FR2494141A1 - Shunt reactor for power supply lines - has toroidal magnetic core built-up from sandwiched sheet laminations of decreasing length - Google Patents

Abstract

The core is composed of sections each in the form of a disc with a circular central hole. The disc is assembled from sectors formed of a succession of laminations. These are in two packets of identical length forming a sandwich with laminations of regularly decreasing lenth between them. The laminations are cut by an automatic machine incorporating a plate which, after stacking of the first packet oriented in one direction, can be reoriented at an angle (alpha) corresp. to that of the sector to be laminated. The remaining laminations are oriented in a different direction and cut to progressively decreasing lengths, and the complete sector can be obtd. already,stacked. The coefft. of filling of the core is improved and total iron losses are minimised. The masses of iron, copper and insulation are also reduced. The shunt reactor is used for reactive power compensation in long transmission lines.

Description

Automatic machine for cutting sheets
The present invention which constitutes a divisional application of the original application No. 80 10574 of May 12, 1980 for "Electric coil of shunt inductance and automatic machine for cutting sheets" relates to an automatic machine for cutting sheets.

 It is advantageous in certain cases and in particular in the case of shunt inductors to produce portions of packets of sheets the length of the sheets of which decreases from one sheet to the next so as to produce packets in the form of portions angular.

 The subject of the invention is therefore an automatic machine for cutting sheet metal comprising means for feeding, onto the machine, a length of sheet metal which is continuously adjustable and, at will, a shear and a device for receiving cut pillowcases characterized in that the device for receiving the cut sheets comprises an adjustable pallet of an angle c (chosen at will around an axis perpendicular to the direction of movement of the sheet, means for lowering the reception device and means for moving the receiving device downstream relative to the direction of movement of the sheet.

The invention will be better understood in the light of the description of an exemplary embodiment of the invention given below with reference to the appended drawing in which
Figure 1 schematically shows a sheet metal cutting machine according to the invention.

 Figure 2 shows a top view of a portion of a magnetic core section of a shunt inductor.

 FIG. 1 thus shows a machine for cutting the sheets comprising a device for receiving the cut sheets capable of constituting packets of sheets such as the packet of sheet 1 shown in FIG. 2.

The machine essentially comprises three parts - means for feeding the sheet, not shown, but conventionally comprising a fixed stop, a movable stop whose movement is ensured by a lead screw, and a movable clamp moving between the two stops: the clamp takes the sheet at the end of its rear stroke limited by the movable stop, drives it forward until the fixed stop releases the sheet after cutting, spread it between the fixed stop and mobile determining the length of coded sheet.

the actual shears comprising a movable knife 20, a fixed counter blade 21 and a device for blocking the sheet 22.

- A receiving device 23 comprising a frame 24 on which is placed a pallet 25 which can be oriented by an angle t adjustable at will around an axis 26 perpendicular to the direction of advancement of the sheet 27 by means of a jack 28. The pallet 25 has lateral cheeks 29 with adjustable spacing. A cylinder 30 allows the vertical movement of the frame 24. It is thus possible to ensure that the height of fall of the cut sheet is constant. Finally, a jack 31 allows the movement downstream of the frame 24 for the evacuation of the packet of cut sheets 32. All movements: of the pallet 25, of the cylinders 28, 30, 31, of the knife 20, of the supply of the length of the sheets, are # automatic and programmed.

To make a pack of sheets such as the portion 1 shown in FIG. 2, one begins by adjusting the pallet 26 in a horizontal position, the angle i being equal to 0 and the sheets arriving in the direction of the arrow F2 (fig. 1) first cutting the sheets of the package 12 then automatically, according to the program, the jack 28 ensures the rotation of the pallet 25 about its axis 26 by an angle i equal to the angle i of the portion 1 and the package of sheets 14 is then cut, which then fall horizontally, the machine is also programmed to step by step increase the length of each sheet. The pitch y is for example 1.76 mm for sheets 35 hundredths of a millimeter thick g for an angle i of 11 15 ′ corresponding to thirty two portions 1 in a section 8. The formula for the pitch y is: y =
Without changing the angle # we cut the package 13 of sheets of identical length. During the entire cutting time, the jack 30 lowers the frame 24 continuously so that the height of fall of the cut sheets is constant. Finally, the jack 31 pushes the frame 24 to the right and the pack of sheets 32 can be taken.

 Such a package of sheets can for example be used to make a shunt inductor such as that claimed and described in the original application.

Claims (1)

CLAIM Automatic machine for cutting sheet metal comprising means for feeding onto the machine, of a length which can be adjusted continuously and at will, of sheet metal, a shear (20, 21, 22) and a receiving device (23) cut sheets, characterized in that the device for receiving cut sheets comprises an orientable pallet (25) of an angle i chosen at will around an axis (26) perpendicular to the direction of movement (27) of the sheet, means for lowering (30) the receiving device and means (31) for moving the receiving device downstream relative to the direction of movement of the sheet.