Abstract: A separately excited electric machine having a stator provided with at least one exciter unit and a rotor provided with strips. Each exciter unit comprises two secondary magnetic circuits and one primary magnetic circuit. Each secondary magnetic circuit comprises a stator exciter winding and two annular yokes provided with teeth. The primary magnetic circuit comprises a rotor exciter winding and an annular ring. First magnetic fluxes generated by the primary magnetic circuit circulate around loops in each strip and second magnetic fluxes generated by the secondary magnetic circuits circulate around loops in the strips, the teeth, and the ring. Each strip thus has a first north pole and a first south pole, with the teeth comprising in alternation second north poles and second south poles.

Abstract: An electric machine includes a stator and a rotor, with the stator being equipped with at least one annular exciter unit that includes a coil and at least two annular yokes, with the rotor being equipped with a structure and at least one annular receiver unit. Each receiver unit includes at least two rows of magnets. Two sides of each yoke include teeth distributed angularly in a regular manner, and the teeth of the two adjacent yokes fit onto a face of the exciter unit, alternately forming north poles and south poles. Each row of the magnets is positioned opposite one face, forming an air gap with the exciter unit, with the electric machine thus including at least two air gaps, with a 3D magnetic flux thus circulating inside the said electric machine, dividing and regrouping itself in the vicinity of the magnets and of the yokes.

Abstract: An electric machine including a stator that is provided with at least one exciter unit including a coil, at least two annular yokes and at least one row of intermediate pieces, and a rotor having a structure and at least one receiver unit including at least two series of at least two rows of magnets. Two sides of each yoke include the first teeth, fitting with the intermediate pieces on a face of the exciter unit and alternatingly forming the second north poles and the second south poles. Each series is positioned opposite one face, forming an air gap with the exciter unit, with the electric machine thus including at least two air gaps, with a flux thus circulating inside the electric machine, dividing and regrouping itself in the vicinity of the magnets and of the yokes.

Abstract: The invention relates to a method for manufacturing a dog ring gear, each dog being made up of a front portion and a rear portion, the method including the following steps: forming, by means of compression and sintering, a ring gear with dog preforms extending on all or part of the periphery thereof; and calibrating the sintered ring gear in a die including a front die half and a rear die half intended for engaging at the junction between the front and rear portions of the dogs, the thickness (A) of a rear portion (BP) of each preform, in the original plane of the dogs, being greater than the narrowest section (S1) of a groove formed in the rear die half and smaller than the thickest section (S2) of the groove, in the plane.

Abstract: A homopolar motor phase (d4) which consists of a wafer (a0), the leg (a3) of each tooth meeting the leg of the next tooth before touching the cylinder head (a4), the leg (a3) at least partially filling the space (a6) between the teeth. The inner diameter (a11) is reduced by the presence of a discontinuity in the area (a7) at the tip of the tooth (a5).

Abstract: The present invention relates to an electric machine (1) that includes a stator (10) and a rotor (20), with the said stator (10) being equipped with at least one annular exciter unit (11) that includes a coil (12) and at least two annular yokes (13a, 13b), with the said rotor being equipped with a structure (21) and at least one annular receiver unit (22). Each receiver unit (22) includes at least two rows (24) of magnets (23). Two sides (131, 132) of each yoke (13) include teeth (14) distributed angularly in a regular manner, and the said teeth (14) of the two adjacent yokes (13) fit onto a face (121) of the said exciter unit (11), alternately forming north poles and south poles.

Abstract: The present invention relates to an electric machine (1) consisting of a stator (10) that is provided with at least one exciter unit (11) consisting of a coil (12), at least two annular yokes (13a,13b) and at least one row of intermediate pieces (15), and a rotor (20) having a structure (21) and at least one receiver unit (22) consisting of at least two series (25) of at least two rows (24) of magnets (23). Two sides (131,132) of each yoke (13) consist of the first teeth (14), fitting with the said intermediate pieces (15) on a face (121) of the said exciter unit (11) and alternatingly forming the second north poles and the second south poles. Each series (23) is positioned opposite one face (121), forming an air gap (30) with the said exciter unit (11), with the electric machine (1) thus including at least two air gaps (30), with a flux F thus circulating inside the said electric machine (1), dividing and regrouping itself in the vicinity of the said magnets (23) and of the said yokes (13).

Abstract: Homopolar electric machine, characterized in that its structure is double, its rotor and its stator being simultaneously homopolar, and in that it includes a stack of pairs of simple homopolar stators, forming monophasing elementary machines, or in a reverse version, the elementary machines being powered with AC current; the rotor is common to all these stators, and is passive, that is to say composed completely or partially of ferromagnetic materials.

Abstract: A homopolar motor phase (d4) which consists of a wafer (a0), the leg (a3) of each tooth meeting the leg of the next tooth before touching the cylinder head (a4), the leg (a3) at least partially filling the space (a6) between the teeth. The inner diameter (a11) is reduced by the presence of a discontinuity in the area (a7) at the tip of the tooth (a5).

Abstract: The invention relates to a method for manufacturing a dog ring gear, each dog being made up of a front portion and a rear portion, the method including the following steps: forming, by means of compression and sintering, a ring gear with dog preforms extending on all or part of the periphery thereof; and calibrating the sintered ring gear in a die including a front die half and a rear die half intended for engaging at the junction between the front and rear portions of the dogs, the thickness (A) of a rear portion (BP) of each preform, in the original plane of the dogs, being greater than the narrowest section (S1) of a groove formed in the rear die half and smaller than the thickest section (S2) of the groove, in the plane.

Abstract: A sintered metallic filtering element in the form of a porous metallic tube is provided with a connecting fitting by forming the tube with an internal surface in the form of an internal truncated cone of circular cross section at one end of the tube, the internal truncated cone having a vertex half angle .alpha. greater than zero. The connecting member of the invention includes a truncated cone shaped head of circular external cross section having a vertex half angle .alpha. which is the same as the vertex half angle .alpha. of the internal truncated cone of the tube. The head of the connecting member is disposed inside the porous metallic tube and cooperates with the internal truncated cone. The connecting member also includes a tubular extending member attached to the smaller end of the head, with the tubular extending member extending beyond the porous metallic tube.

Abstract: A process for fitting at least one metal piece, which has at least one cylindrical bore, around a metal tube, in particular a metal cam shaft, as used, for example, in an internal combustion engine. The process includes clamping the metal piece in the assembly unit and introducing the metal tube into the bore of the metal tube with one end of the tube bearing upon the retractable stop. After expansion of the tube to fix the one metal piece on the tube, and the retractable stop is retracted before any additional metal pieces are fitted to the tube.

Abstract: The invention relates to a method of producing connected sintered articles obtained by breaking a unitary preform.It is characterized in that:a) a preform is pressed from powdered metals while imprinting in it a superficial groove (3) located in a plane for the purpose of subsequent breakage,b) this preform is presintered in order to consolidate it mechanically, the preform however remaining brittle,c) it is optionally compacted by recompression,d) recesses for the members for the mechanical connection of the final parts are optionally machined in this preform,e) this preform is broken into at least two parts,f) final sintering is carried out,g) the articles are cooled.The invention is applicable in particular to the production of connecting rods and connecting rod covers or of annular articles with or without an undercut (broken in the axial plane).

Abstract: A method for coating an annular inclined surface of a part with a powder prior to sintering, in which a lower annular axial surface is provided below and extending the inclined surface of the part. Along the axis of the part, a central tool is arranged having a lower axial surface slidable relative to the lower annular axial surface and an annular inclined surface above the lower axial surface and facing the annular inclined surface of the part. The part and the tool define an annular gap which is closed at the bottom portion and which has an open annular upper end above the annular inclined surface and the inclined surface of the part. The annular gap is filled with a powder through the open upper end which is then closed, and the part with the lower annular axial surface and the central tool are then relatively displaced, causing the inclined surface of the part and the annular inclined surface to become closer and compress the powder against the annular inclined surface of the part.