Abstract: The invention relates to a stator (200) comprising an annular body (210) provided with a plurality of slots (213) and a winding (400) comprising a first series (A) of needles (1) and a second series (B) of needles (1) which are arranged in the slots (213) in a plurality of superimposed layers (C1-C4), each needle (1) comprising a first segment (1A) and a second segment (1B) which are each arranged in different slots (213) and connected by an elbow connector (1C). According to the invention, the first segments (1A) and the second segments (1B) of the first series (A) are respectively arranged in a first layer (C1) and in a second layer (C2) and the first segments (1A) and the second segments (1B) of the second series (B) are respectively arranged in a third layer (C3) and in a fourth layer (C4), the first series (A) being electrically connected to the second series (B).

Abstract: An induction heating device for continuously moving metal strip (22) for heat treatment or coating purposes comprises a flattened, spirally wound coil having the turns interlinked by an oblique connection on a small side of the coil, and surrounding the continuously moving metal strip (22). Means (24-26) are provided for suppressing the transverse component of the magnetic field created by the said coil.

Abstract: A two-dimensional network of alternating (N,S) magnetic poles is generated by a heavy gauge conductor (F) having an alternating current from an excitation source (G) passing therethrough. The conductor follows zigzag go and return paths (T1,T6) without any crossing, juxtaposition, or superposition, thereby simplifying construction. The invention is applicable to handling metal sheets in steel mills.

Abstract: As known the product to be heated (7) is made to scroll longitudinally in the flow of an inductor (IC) with a dual frequency along a longitudinal pitch and along a transverse pitch. According to the invention this produce is made to scroll in the flow of two successive inductors with a common transverse pitch (PT) which is adjustable (31a) practically between the two longitudinal pitches of these two inductors, this transverse pitch is set to make the width of this product coincide with an integer number of transverse pitches thus obtaining the same heating on the two edge areas (7a, 7b) of this product as on the intermediate areas, and firstly the ratio of the currents supplying these two conductors is set to homogenize the heating in each transverse pitch, and secondly the total power adjusted to reach the temperature required. The invention applies to metallurgy.

Abstract: Electromagnetic pump for electrically-conductor fluid containing an external pipe (1) enveloped by magnetic half-yokes (11, 11') containing slots (14) in which half-coils (19, 19') are installed forming two polyphase half-windings (35, 35') permitting a symmetry plane.The fluid is contained in a duct (31) comprised between the external pipe (1) and an internal pipe (5) which is closed and contains a magnetic core (24). The duct (31) is provided with partitions (29, 29', 34) which separate the duct (31) into two active half-ducts (32, 32') in which the fluid flows and two passive streams (33) in the vicinity of the joint plane in which the fluid scarcely flows at all.Pump with a high degree of efficiency and easy to dismantle.

Abstract: The protection device comprises two half cages (13, 14) superposed on each other and surrounding the rotor (8) under test. The half cages together constitute a cage with openings between its bars and provided with water cooling in said bars. The cage ensures that the magnetic field generated by a rotor under test with excitation current is stopped within a distance equivalent to the size of the holes between the cage bars. Induced current heating in the cage is kept under control by water cooling, and metal objects outside the cage are substantially protected from the magnetic field by the cage. Air can pass freely through the cage, and the rotor can be observed without removing the cage.

Abstract: A translating field inductor for the stirring roller of a continuous slab caster includes a grooved arbor carrying flat magnetic sheets disposed parallel to the axis of the arbor, the latter and the sheets being notched by a series of circumferential grooves spaced over the length of the arbor and housing circular induction coils. In order to concentrate the magnetic flux on the moving slab in the course of the continuous casting, the arbor is stationary and is made of a nonmagnetic metal with good electrical conductivity. It has a longitudinal groove with a wide transverse cross section housing a single packet of sheets, which constitutes the magnetic core of the inductor. The arbor forms a screen for the magnetic flux generated by the induction coils with the entire assembly being such that the magnetic flux is oriented in a fixed, prescribed direction.

Abstract: An electric furnace for induction heating of metallic products comprises a planar inductor providing a sliding magnetic field, the inductor being incorporated in a pair of transversely spaced walls defining between themselves a space into which the product to be heated is inserted, a layer of refractory material at that side of each wall which borders the space and an independent cooling screen sandwiched between each wall and the respective layer of refractory material, in which the screen is constituted by a plurality of parallel, adjacent metal tubes out of mutual contact with each other to define between themselves electrically insulating spaces, preferably filled with electrically insulating material, and in which the tubes extend normal to the flow of the primary current through the inductor. Preferably at least one of the walls together with the respective refractory layer and screen is movable toward and away from the other wall to accommodate metal products of different widths in the space.

Abstract: An electromagnetic inductor for generating a helically moving magnetic field includes a first magnetic circuit having an annular core with radially inwardly projecting teeth and a winding for generating a rotating magnetic field, and a second magnetic circuit formed by foliated bars and a second winding comprising an axial series of circular coils for generating an axially moving field. The two fields combine to generate a field with helical movement. At least some consecutive teeth of the core are hollowed to provide axial grooves in which the foliated bars are disposed. The coils of the second winding are cylindrical and set inside the cylindrical volume defined by the teeth. The inductor is particularly adapted for the electromagnetic rabbling of a billet in a continuous casting process.

Abstract: An electromagnetic centrifuging inductor structure for creating a rotating magnetic field for rotating molten metal about its casting axis while passing through the casting conduit of a continuous casting type ingot mold includes an annular core body of magnetic material surrounding the casting conduit and which is provided with six poles or teeth on which are respectively mounted six different arcuate coils for energization by a three-phase a.c. source. Two coils are provided for each phase and these are so distributed that two coils of the same phase have different radii, are mounted on two diametrically opposite teeth and are coupled in such manner that their generated magnetic fluxes are additive. The coils are mounted in recesses formed between adjacent teeth and the coils of different phases partially overlap within the same recess.

Abstract: An electromagnetic inductor ingot mold for the continuous casting of blooms includes water cooled boxes having opposed, parallel vertical walls which are spaced by means of braces arranged in a matrix. An inductor for creating a varying magnetic field is disposed within each of the boxes and includes a comb-shaped core. The core is subdivided into a plurality of individual circuits. The individual circuits and the rectilinear active conductors of the inductive windings of the inductor form a grid interlaced with the rows and columns of the matrix arrangement of braces.

Abstract: An electromagnetic apparatus comprising two inductors generating a gliding magnetic field. Each inductor has a plane active face and the faces of the two inductors define a parallelepiped space therebetween to receive an armature. A plurality of pairs of rectilinear electrical conductors at each active face are associated to form two-phase imbricated windings connected in series within each inductor. The input conductor of each inductor is connected to the output conductor to form a single closed winding connected as a Wheatstone bridge. A two-phase generator feeds electric energy to the input conductors, one phase of the generator being connected between the points of junction of the two-phase windings of one inductor and the other generator phase is connected between the points of junction of the two inductors.

Abstract: A channel furnace for the melting of metals and alloys, of the kind comprising an inductor device for the heating and the unidirectional forced circulation of the molten metal in the channel. The inductor includes a single coil 10 formed of two layers of conductors wound along helices whose axial pitch is equal to the axial length of the coil for one half-turn of winding. The coil is divided into n pairs (n .gtoreq.3) of circuits of m turns each, regularly distributed over the periphery of the coil, the two circuits of each pair being derived one from the other by a rotation of 180.degree. about the axis of the coil and being series-connected together additively from the point of view of the axial component of the magnetic flux which they generate. The pairs are shifted in angle by 2 .pi. /n about the axis of the coil so as to form n phases shifted by 2 .pi. /n.