Abstract: Rotor for an electric motor that comprises a core (1), segments of a cylinder (5, 6, 7) made of magnetizable materials, a substantially cylindrical retaining wrapper (10) whose end portions are joined to at least a pair of plane elements (8, 9). The rotor also comprises first elastic means (11, 12, 13) having a length that is not smaller than the length of the core and being supported by means (2, 3, 4) that are integrally provided in the core parallelly to the axis of rotation (X) of the rotor, which interfere with contiguous longitudinal edges of the segments of a cylinder so as to keep said segments circumferentially spaced from each other. In a preferred manner, the rotor also comprises second elastic means (21-26) which are adapted to make up for the longitudinal and radial plays of the various parts of the rotor so as to ensure that the outer surface of the segments of a cylinder keeps in contact with the inner surface of the wrapper. The invention further relates to a method for producing the rotor.

Abstract: A refrigerant compressor driven by an electric motor, whose supply frequency is selectively variable between a discrete number of values (f1, f2, fT) as a function of an input signal, uses control means integrated in the compressor to monitor two or more quantities that are variable with time in a mutually independent manner, of which at least one is representative of the actual operating conditions of the appliance. The control means also generates the input signal with a value that corresponds to a pre-established combination of the monitored quantities.

Abstract: Arrangement for the insertion of coils in a stator including a moving wire-insertion spider, a plurality of parallel wire-guide blades arranged along the contour of the moving spider, a stack-guide member provided with a plurality of recesses accommodating respective blades which are provided with a groove on their outer surface. The recesses are provided with a rib protruding towards the interior of the respective recess and extending parallel to the longitudinal direction thereof, and are adapted to engage respective grooves when the stack-guide member is inserted within the wire-guide blades. The grooves maybe arranged in pairs on a respective blade and are symmetrical with respect to a vertical plane passing through the axis of the moving spider.

Abstract: A compressor including a valve plate held between the body and the head with the interposition of a first and a second flat sealing gasket. The compressor further includes a thin-sheet aspiration valve associated with an aspiration hole provided on the valve plate. The entire valve is accommodated within a recessed area provided on a surface of the valve plate that is turned toward the body of the compressor.

Abstract: A hermetic motor compressor unit for household and similar refrigeration appliances, comprising a sealed casing having a bottom that forms a sump for holding lubricating oil. Inside of the casing is a compressor and driving motor that share a common hollow crankshaft that rotates about a vertical axis. To ensure effective lubricating oil flow into the hollow crankshaft, a means for providing suction comprising a sleeve is rigidly fixed to the lower end portion of the crankshaft. A fluted member made of a material with a lower thermal conductivity than the material from which the hollow crankshaft is made that is connected to the stator of the drive motor is inserted into the sleeve to draw the lubricating oil from the sump. The lubricating oil is drawn in from the oil sump into recesses in the fluted member when the sleeve is rotated into the position in which it allows the recesses to communicate with lower apertures in the sleeve. This occurs during the downstroke of the fluted member.

Abstract: Hermetic refrigeration compressor, in particular for household refrigeration appliances, comprising control and connection means, such as a motor overload cutout (13) provided with a protective support (14), an electric motor starter (16), a terminal block (17) with related strain-relief (18), and a closing cover (27), in which some of these component parts are integrated into a single one-piece construction (15). The cover (27) is mounted slidably in a direction which is tangential to the casing (10) of the compressor. This solution is advantageous in that it cuts the number of parts to be assembled and reduces the amount of space required to accommodate the compressor.

Abstract: A compressor including a valve plate held between the body and the head with the interposition of a first and a second flat sealing gasket. The compressor further includes a thin-sheet aspiration valve associated with an aspiration hole provided on the valve plate. The entire valve is accommodated within a recessed area provided on a surface of the valve plate that is turned toward the body of the compressor.

Abstract: Rotor for electric motors, in which the laminations of two types and arranged alternately, are made in a manner that a first type is provided with a plurality of protrusions formed by respective protruding tabs, a plurality of perforations being punched in the lamination near the edge of a respective tab with the same orientation pattern thereof so as to create an alternate sequence of tabs and respective perforations, wherein a respective cavity is provided in the respective lamination in correspondence of the tabs of said first type, whereas the second type of laminations is provided with a plurality of different tabs adapted to engage the cavities formed by the association of said recesses corresponding to said first tabs with said respective perforations, wherein the tabs of the second type are produced without any removal of material.

Abstract: A piston and connecting rod includes a connecting rod supporting a piston. The connecting rod has a piston end, with the piston being supported on the connecting rod so that it is moved away from the piston end during pivoting of the connecting rod in response to a predetermined angular movement of its crank end so as to maintain the compression ratio during the combustion phase and increase the dwell period of the piston prior to its descent. The piston includes a rounded recess underneath, and the connecting rod includes a terminal portion with a shape to pivot within the recess. An elastic element snaps into recesses of the piston to hold the rod and piston together.

Abstract: Electric compressor comprising a piston provided with a respective head and a valve plate mounted between the head and the body of the cylinder and provided with a gas suction port, the head being provided with a protrusion adapted to be intermittently introduced in the suction port substantially in the top dead-center position of the piston. The piston is provided externally, in the portion thereof which is opposite to the head side, with a recess that is accessible from the outside and is orientated towards the inner volume of the piston, the recess penetrating the body of the piston down to a depth which is at least equal to the height of the protrusion above the plane of the head.

Abstract: A hermetic reciprocating compressor for refrigerators and freezers, driven by a brushless-type electric motor and provided with a frequency control arrangement to let the motor run at any speed that is compatible with a correct operation of the compressor, achieving an increase in the overall efficiency, a reduction in the operating noise and a reduction in the energy consumption of the compressor. The new compressor design makes it possible to standardize and reduce the number of compressor models which are required to cover a broad application range in refrigeration appliances.

Abstract: A single-winding capacitive filter having two metal layers separated by a dielectric and forming a plurality of capacitors having at least one common wound layer. One of the metal layers protrudes from one end of the wound layer at least for a certain number of turns whose protruding portions are electrically interconnected by a short-circuit. The short-circuiting of one of the wound layers reduces the self inductance of the filter.

Abstract: A control circuit for direction indicator lamps of a vehicle includes an alternating voltage generator suitable for feeding the lamps through a manual commutator or switch and at least one bi-directional conduction controlled diode which is driven by an impulse generator. The latter is suitably driven by the alternating voltage of the generator to furnish an output signal of alternating impulses synchronized with the zero changeovers of the alternating voltage. The impulse generator is driven by a timing stage with a signal of alternating blocking and admitting impulses.