Abstract: A method for starting a motor (14) with a bidirectional rotation direction, to rotate a fluid circulation centrifugal pump (10) having a predetermined optimum hydraulic efficiency depending on the starting rotation direction thereof. The method provides an initial motor (14) starting in either rotation direction, with subsequent pump (10) rotation in the same direction and, subsequently, a periodical interruption and restoration of the motor (14) power feeding as many times (N, N?) as to ensure the motor (14) starting, at least one or more times within a predetermined time interval (Ttot, Ts), in the rotation direction which corresponds to the predetermined pump (10) optimum hydraulic speed.

Abstract: Synchronous electric motor (3) for washing-machines (1) and similar household appliances with rotary drum (2), of the type comprising an inner stator (5) having relative stator windings (9) mounted fixed on a central axis (10), an electronic control board (18) electrically connected to the stator, and a heat sink element (20) associated with the electronic board (18). The heat sink element (20) is mounted on the stator (5) in an axial extension thereof and spaced therefrom. The electronic control board (18) is supported by the heat sink (20) on a side facing the stator (5).

Abstract: The present invention relates to a method and relevant electronic device (10) for determining the hydraulic flow rate in a pump driven by a synchronous electric motor (12), said motor (12) being of the type comprising a rotor (14), equipped with a permanent magnet, which is rotation-driven by the electromagnetic field generated by a stator (16) equipped with pole pieces (18) with relevant windings. The method comprises an indirect measuring of the flow rate through the following steps of: acquiring at least one pump operation variable; comparing the value of said variable with a predetermined correlation table to hydraulic flow rate values and determining a corresponding flow rate value.

Abstract: Pressure filter for aquariology for retaining impurities of the water intended for ponds, aquaria and the like, of the type comprising a glass-like container (12) closed by a cover (14), a liquid path (15) extended in the container between an inlet opening (16) and an outlet opening (17), a filtering body (18) placed along the path and having an exposed surface (19) whereon the impurities are retained, and at least a brushing element (31) mounted in the container in a guided way with to-and-from movement along the exposed surface (19) for removing the impurities, characterized in that the brushing element (31) is mobile against the exposed surface (19) for maintaining a pressing contact between the brushing element (31) and the exposed surface (19).

Abstract: A coupling device for a dishwasher pump with a synchronous motor and external stator, comprising a first tang connected to the delivery tube of the pump, a second tang connected to the suitable pipeline of a washing tank and a connection mean part. The connection mean part comprises a frustum of cone-shaped section, intermediate between said first and second tang and a flexible annular lip formed between said second tang and the smallest base of the frustum of cone-shaped section. Advantageously, the external part of the frustum of cone-shaped section is reinforced with annular ribs.

Abstract: A method for filtering the water of an aquarium, a water cultivation tank or similar water bonds, by means of a filtering system comprising a closed vessel and defining a chamber, a filtering body housed in the chamber, a circulation pump having a suction duct, communicating with the aquarium by interposition of a siphon and a delivery duct communicating with the aquarium. Vent means are also provided to eject the air from the chamber. The method comprises the steps of: filling the filtering body with a predetermined amount of water; starting the pump; short-circuiting the pump by means of a fluid passage by putting the delivery duct in communication with the closed vessel; keeping the pump short-circuited at least up to determine the siphon trigger; subsequently stopping the pump; keeping the pump stopped to allow the air to escape from the chamber and the filtering body to be filled with water; re-starting the pump.

Abstract: A method drives a synchronous electric motor, particularly to start a fan/exhaust fan. The method includes measuring the supply voltage value of the electric motor windings being proportional to the mass flow rate. The method also includes measuring a real load angle, by a signal coming from a Hall sensor associated with the motor rotor; performing a comparison with an optimal load angle corresponding to a reference mass flow rate of fluid being exhausted; and changing the voltage value and the operating frequency applied to the electric motor up to reach a value of the real load angle corresponding to said optimal load angle value.

Abstract: A rotation support has improved thrust-bearing for rotors of electric motors of synchronous pumps. The rotation sup: a stator of the electric motor, in which a hollow body is housed for supporting and containing a permanent magnet rotor, an impeller being kinematically coupled with a shaft of the electric motor, as well as opposite supports of the shaft, one of which is provided with axial thrust-bearing. Advantageously, the support provided with thrust-bearing comprises a bush of antifriction material facing a side of the rotor and which has an axial abutment placed directly in contact with this side of the rotor.

Abstract: A pump with impeller, particularly for washing machines and similar household appliances, comprising: a synchronous electric motor with permanent magnets rotor (5), contained in a pump body (2), and with a driving shaft (7) that axially crosses the rotor (5); an impeller (25) kinematically connected to said shaft (7) comprising a hub (26) with a plurality of vanes (30) projecting from a prevailing portion (28) thereof; said impeller (25) comprising at least one auxiliary vane (35) projecting from the residual portion (29) of the hub (26) suitable for generating a fluid-dynamic motion to move away the possible lints present in the washing fluid.

Abstract: The present invention relates to a synchronous pump structure, particularly to an immersion pump (1) equipped with a float control device (3) and comprising a synchronous electric motor (2) with a permanent magnet rotor (8). The pump (1) is so structured that the float (16) of the control device (3) is incorporated in an envelope (11), externally associated with the body (15) of the pump (1). A sensor element (4) of the control device (3) housed in the pump body (15) in correspondence with the float (16) is also provided.

Abstract: The present invention relates to a control method for a synchronous electric motor with permanent-magnet rotor, particularly for fluid circulation pumps in conditioning systems and/or household appliances, wherein the application of predetermined voltage values to each of the windings (L1, L2) of the motor is provided, by means of a converter control circuit (10). The method provides a continuous measure of the amplitude of the bus (Vr) ripple and a comparison with a reference value, for example with respect to an average bus voltage level. According to the comparison result the motor is driven by means of a variation of the winding voltage having an sinusoidal wave form.

Abstract: The invention relates to an electronic driving device (20) for turning on and off a synchronous pump, that is a pump (15) comprising a synchronous electric motor (1) with a permanent-magnet rotor (8), comprising:—at least a static power switch (17) inserted in series between the motor (1) and an AC electric power supply source (Vp); and—a processing unit (16) having at least an input receiving a synchronism signal (V) and a control output connected to said switch (17); characterised in that it is enabled by a signal emitted by a float level sensor (40) and includes an input receiving a signal (a) by a position sensor (21) detecting the rotor (8) polarity and position; the pump turn-on and off being regulated according to the signal emitted by said level sensor (40) and to a measured difference between a critical load angle (8) and a current load angle computed during different working conditions of the pump.

Abstract: A method for obtaining, in a quick way, a strong, compact and waterproof permanent-magnet rotor (3), intended for a synchronous motor (1), particularly for pumps of washing machines for industrial and domestic use and the like, of the external stator (2) type, comprising a cylindrical hollow core (6) surrounded by a plurality of permanent magnets (10) comprising the steps of arranging a cup-like body (7) with a base end (8a), a free end (8b) and a side wall (9) exhibiting a plurality of passing longitudinal recesses (12) which define, between the same, a plurality of positioning seats (13) for the magnets (10), providing to insert the core (6) into the cup-like body (7) and arrange the magnets (10) in said seats (13) and injecting a plastic material with obtainment of a cage-like structure (50) having opposite bottoms (27, 28) abutting at the ends (8a, 8b) of the cup-like body (7) as well as columns (29) extended between the opposite bottoms (27, 28) housed in the recesses (12).

Abstract: The invention regards a permanent-magnets mono-phase synchronous electric motor (7) for washing machines and the like, in particular for washing pumps (1), with improved stator (4) structure and of the type centrally comprising a permanent-magnets axial rotor (2) and a stator (4) with a lamination pack core (5) and a couple of pole pieces with ends enveloping the rotor (2), of which they have substantially the same axial length and from which they are spaced by respective aircore. Such a motor is distinguished in that the lamination pack core (5) has a shorter axial length with respect to the ends (10, 11) of said pole pieces. Advantageously, the stator (4) pole pieces are obtained through moulding magnetic powders.

Abstract: A permanent-magnet rotor for external-rotor electric motor (1) particularly for washing machines of unusual silence comprising a cup-shaped support structure (6) having a bottom (7) and a side wall (10) and a plurality of magnetic poles (12) arranged in the support structure (6) and arranged along said side wall (10), with elastomeric material interposed between said magnetic poles (12) which forms with them a massive structure (14) of uniform thickness.

Abstract: The invention concerns a synchronous electric motor (3) particularly for washing-machines (1) and similar household appliances with rotary drum (2) kinematically connected to the motor (3) through a belt and pulley link (6), of the type comprising a central stator (5) mounted fixed on an axis (7), and an outer rotor (4) with permanent magnets (13) rotably cantilevered supported on the axis (7) of the motor (3) with interposition of at least one bearing (19). Advantageously, the rotor (4) is substantially cylindrical cup-like shaped with bottom wall centrally shaped like a cylindrical funnel defining a hub (14) for receiving the bearing (19) and with a pulley (27) formed integrally with the hub in its substantial axial extension.

Abstract: A device for transmitting motion between the rotor of a synchronous permanent-magnet motor and the working part, having an increased free rotation angle, which comprises at least two motion transmission couplings which mutually cooperate in a kinematic series. Each coupling is constituted by at least one driving element which is eccentric with respect to the rotation axis and is rigidly coupled to a first component of the motion transmission system and by at least one driven element, which is also eccentric with respect to the rotation axis and is rigidly coupled to the component arranged kinematically after the preceding one. The angle covered by the elements of each coupling is, as a whole, less than a round angle. The intermediate components of the kinematic transmission have both a driven element and a driving element for receiving the motion from the preceding one and transmitting it to a subsequent one.

Abstract: Pressure filter for aquariology for retaining impurities of the water intended for ponds, aquaria and the like, of the type comprising a glass-like container (12) closed by a cover (14), a liquid path (15) extended in the container between an inlet opening (16) and an outlet opening (17), a filtering body (18) placed along the path and having an exposed surface (19) whereon the impurities are retained, and at least a brushing element (31) mounted in the container in a guided way with to-and-from movement along the exposed surface (19) for removing the impurities, characterised in that the brushing element (31) is mobile against the exposed surface (19) for maintaining a pressing contact between the brushing element (31) and the exposed surface (19).

Abstract: The present invention relates to a coupling device for pump (16) with synchronous motor having external stator (20), for dishwasher, comprising a first tang (2) connected to the delivery tube (15) of the pump, a second tang (3) connected to the suitable pipeline of the washing tank and a connection mean part (7), wherein said mean part comprises a frustum of cone-shaped section (7), intermediate between said first (2) and second tang (3) and a flexible annular lip (5) formed between said second tang (3) and the smallest base of said frustum of cone-shaped section (7). Advantageously, the external part (8) of the frustum of cone-shaped section is reinforced with annular ribs (10, 12).

Abstract: A device for transmitting motion between the rotor of a synchronous permanent-magnet motor and the working part, having an increased free rotation angle, which comprises at least two motion transmission couplings which mutually cooperate in a kinematic series. Each coupling is constituted by at least one driving element which is eccentric with respect to the rotation axis and is rigidly coupled to a first component of the motion transmission system and by at least one driven element, which is also eccentric with respect to the rotation axis and is rigidly coupled to the component arranged kinematically after the preceding one. The angle covered by the elements of each coupling is, as a whole, less than a round angle. The intermediate components of the kinematic transmission have both a driven element and a driving element for receiving the motion from the preceding one and transmitting it to a subsequent one.