Abstract: Apparatus for soldering the winding to the commutator of a rotor of great weight of an electric machine. The apparatus has a vessel containing a bath of molten solder and electric resistance heaters, a single-phase magneto-hydrodynamic pump consisting of a first magnetic core disposed beneath the vessel, the first magnetic core being supported from below and surrounded by a winding and solder stream-formation unit made of ferro magnetic material which is concentric with the first magnetic core. The bottom wall of the vessel is disposed on the first magnetic core, and within the vessel and on the bottom thereof there is fastened rigidly an additional, second hollow magnetic core, which is a continuation of the first magnetic core, while a tubular casing which is concentric with the second magnetic core, and which is of stepped shape, seats with its external step on the additional, second hollow magnetic core.

Abstract: An apparatus for soldering the wires of the rotor winding of an electric machine to its commutator. The apparatus comprises a tank with molten solder and heaters, a magneto-hydrodynamic pump for the solder, a device for holding the rotor, and a device for the protection of the molten solder from oxidation. The device for holding the rotor comprises a base in the shape of a hollow cylinder with holes and having a chamfered bottom part of the internal surface thereof in which there is movable disposed a replacement nozzle, which is made up of a sleeve and a rotor holding case rigidly connecting together. The nozzle reciprocates in the base. The commutator of the rotor to be solder is inserted into the case. Between the sleeve and the case there is formed a ring-shaped duct, connected with a booster zone which directs the molten solder toward the commutator.

Abstract: Apparatus for soldering the winding of armatures of electrical machines to the collectors thereof. The apparatus includes a device for gripping, displacing and fixing the armature with the collector, a single-phase magnetic-hydrodynamic pump with metal conduit and a bath with molten solder and heaters. The magnetic core of the single-phase magnetic-hydrodynamic pump is embraced by a metal conduit disposed underneath the bottom of the bath, and the inlet of the metal conduit is connected to the bottom of the bath, while its outlet end is rigidly connected to a casing fastened to the bottom of the bath. To the bottom of the casing there is pressed by means of an easily releasable joint a changeable nozzle unit. When it is necessary to solder a collector with a diameter different from the previous one, the changeable nozzle unit is taken out of the apparatus and new one of a size corresponding to that of the collector to be soldered is inserted in the apparatus.

Abstract: Apparatus for soldering the wires of the coil on the armature of an electric machine to the commutator thereof. The apparatus has a device for clamping, shifting and fixing the armature, a monophase magnet-hydrodynamic pump with a charger and a pan with molten solder. The magnetic core of the pump has the shape of a hollow cylinder and is externally chamfered at its upper end. The armature to be soldered is disposed vertically with the lower portion of its commutator telescoped within the upper end of the core. Around the core within the pan there is an annular charger disposed coaxially of the core, the charger having its lower end above the bottom of the pan and its upper end on the level of the upper chamfered end of the core so as to form between the upper end of the charger and the upper chamfered end of the core an annular frusto-conical channel with a discharge end directed toward the upper portion of the commutator and the parts of the wires adjacent thereto to solder the wires to the commutator.