Abstract: A method for starting a permanent magnet single-phase synchronous electric motor which includes a permanent magnet rotor and a stator with windings, and which is connected to an electrical grid by a switch. The method includes: a first starting attempt in which the windings are fed in current with first starting impulses generated only during the half-periods of a first polarity of the voltage of the electrical grid; a first control step which detects whether a starting condition has been obtained in the first starting attempt; and, if the first control step does not detect that the starting condition has been obtained within the term of the first starting attempt, a second starting attempt in which the windings are fed in current with second starting impulses generated only during the half-periods of a second polarity that is opposite to the first polarity of the voltage of the electrical grid.

Abstract: A closure bottom plate 1 for electric pump 100, in particular for a boiler circulation centrifugal pump, is made of a cup-shaped motor cover 2 and a connector-holder cover 3. The bottom plate 1 has an internal aeration path 4, intended to allow the circulation—by natural convection—of air which is heated during the operation of the electric pump 100 preventing the formation of condensate inside the bottom plate 1. The internal aeration path 4 is extended between at least one inlet opening 22 arranged on the motor cover 2 and an outlet opening 36, successively crossing the internal volume of the motor cover 2, the coupling opening 21, and a labyrinth 32 defined by the connector-holder cover 3.

Abstract: A support (200) is described for fixing an electric motor (3) to a tub (6) of a washing machine (1) or similar household appliance. The electric motor (3) is of the type with external rotor (70), for driving in rotation a drum (2) supported in the tub (6); the electric motor (3) is provided with a control circuit board (100) associated with a heat dissipator (33). The heat dissipator (33) is integrally formed with the support (33).

Abstract: The invention relates to a body (1) for the winding of conducting wire with unusually high packing coefficient, comprising a plurality of reels (2), connected in sequence (12) at a predefined pitch, intended to receive by winding the conducting wire, it being possible to articulate the body (1) from an initial arrangement, suitable for receiving the conducting wire by winding on the reels (2), to a substantially circular arrangement, wherein the reels (2), wound, are assembled in an electric motor; the body (1) comprises connection portions (3) which can be configured in such a way that said pitch is high, for the winding, and small, for the assembly; the invention also relates to a synchronous electric motor (1) with central stator (12) and external rotor (32) and comprising a plurality of reels (2) per the stator windings arranged according to a pre-defined pitch and intended to receive respective windings of a conducting wire, wherein the stator (12) comprises a body (10) with mobile structure and which ca

Abstract: Method for starting a single-phase synchronous electric motor using permanent magnets with simple and cost-effective implementation, said method comprising a step of application of a control logic of the switch that provides a first and a second condition for switching on: the first condition being verified when a detected counter electromotive force signal has the same sign as an electrical grid voltage signal; the second condition being verified when said counter electromotive force signal has the same sign as its first derivative value.

Abstract: A method for controlling a discharge pump of a household appliance, including starting a synchronous electric motor that actuates said discharge pump until the synchronism condition is reached, and driving said synchronous electric motor at a steady state through phase control by varying the firing angle (?). In driving said synchronous motor at steady state through phase control, said firing angle (?) is feedback controlled to cancel the phase difference between the mid-point of a zero current plateau of a function of the phase current fed to the electric motor and the zero-crossing point of a counter electromotive force signal (fcem) relative to the same phase. In feedback controlling the firing angle (?), the synchronous electric motor is switched off if the required firing angle (?) exceeds a maximum threshold (?lim), which may result from the operation of the discharge pump in air-water conditions.

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: A process for manufacturing an outer stator for an electric motor whereby the stator comprises stator poles surrounded by coils. A laminar body of ferromagnetic material is prepared, with elongated form and provided with laminar protrusions. A coil of conductive material is then inserted around each of the laminar protrusions. The terminal zones of the laminar protrusions are then cut or separated and deformed in order to assume an outwardly curved form. Then, the laminar body is closed such that the laminar protrusions are in an internal position and adapted to serve as stator poles.

Abstract: An electric motor comprising a stator of the type having polar expansions of the wound type, a rotor chamber defined by a sealed case, closed by a sealing ring, a permanent magnet rotor, housed inside the rotor chamber and a shaft connected to the rotor. The electric motor comprises a valve which allows outflow of fluid from said rotor chamber; the valve is formed by a through bore provided on the sealing ring and an opposing wall for closing the bore; the wall is provided in a wall of a sealing ring holding disc which is form coupled to the sealing ring.

Abstract: A method, which is efficient and cost-effective to implement, for controlling, at steady-state, a synchronous electric motor comprising a permanent magnet rotor and a stator provided with windings connected to an electrical grid by means of a switch controlled by a processing unit, said method comprising the following steps: periodically switching on said switch by means of a PWM output of said processing unit; continuously verifying the shift with respect to an ideal operating condition of the motor; and modifying the switched on period of the switch in feedback to approach said ideal operating condition of the motor.

Abstract: Method for starting a single-phase synchronous electric motor using permanent magnets with simple and cost-effective implementation, said method comprising a step of application of a control logic of the switch that provides a first and a second condition for switching on: the first condition being verified when a detected counter electromotive force signal has the same sign as an electrical grid voltage signal; the second condition being verified when said counter electromotive force signal has the same sign as its first derivative value.

Abstract: A method for measuring the moment of inertia of a washing machine drum containing a load. The drum is set in a rotation by means of a permanent magnet synchronous electric motor taking it to a first angular spin velocity. The method includes identifying a synchronisation point in a periodic signal indicative of the torque provided by the synchronous electric motor at the first angular velocity. An acceleration transient of said drum with constant electromotive torque is provided by the synchronous electric motor. The method further includes interrupting the acceleration transient upon reaching a second angular velocity, acquiring the acceleration transient time duration, and processing an indirect measurement of the moment of inertia of the drum starting from a value of the torque yielded to the drum during the acceleration transient, from the transient time duration value, and from the variation of the angular velocity in the transient.

Abstract: A fans-motor assembly for condenser laundry dryer machine, of unusually low cost and overall dimensions, comprising: a drive shaft which can be associated in a rotating manner with a frame of a laundry dryer machine and designed to be connected by means of a transmission belt to a rotating drum thereof; a fan for the hot air and a fan for the cold air integral in rotation with said drive shaft and designed to convey respectively a flow of hot air and a flow of cold air along separate paths of said laundry dryer machine; a synchronous permanent magnet electric motor comprising an internal stator traversed by said drive shaft and an external rotor integral during rotation with said drive shaft.

Abstract: A filtering unit (1) for an aquarium is described, said filtering unit (1) comprising a closed casing (2), which is to be immersed in a liquid, inlet means (3), a liquid path (4) passing through filters (8), outlet means (5, 15-18), an electric pump assembly (6) for forcing liquid to circulate along said liquid path (4). The outlet means (5, 15-18) comprise a multiple outlet selector (18) which may allow selection of outlets (15-17), in particular in a vertical direction.

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: The present invention relates to a substantially package-like discrete electronic component of the type comprising a power electronic circuit, a body or casing, substantially parallelepiped, and electric connecting pins connected inside the body with said circuit and projecting from said body for an electric connection on the electronic printed circuit board. The body has a heat dissipating header having at least one surface emerging from the body and laying on a plane whereas the pins project from the body for a first section initially extended parallel to the plane. Advantageously a pair of pins has a substantially U-shaped bending, after the first section parallel to the plane for allowing a more stable bearing of the component during the step of welding to a heat dissipating intermediate die.

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 centrifugal discharge pump (1) for electric household appliances, of unusual efficiency, comprising: a working chamber which has an intake opening and a delivery opening; an open impeller (10) arranged inside said working chamber and rotatable about a main axis (x) and motor means (5) designed to drive said impeller (10) by means of a transmission shaft (6). The impeller (10) comprises a planar support element (11) integral with the transmission shaft (6), and a plurality of blades (12) projecting from the planar extension of this element; a free space (13) of predefined volume is provided between the blades (12) in order to allow the removal of foreign solids present in the discharge stream.

Abstract: A closure bottom plate 1 for electric pump 100, in particular for a boiler circulation centrifugal pump, having an integrated system for removing the internal condensate, such plate being extremely easy to manufacture and assemble, comprises: a motor cover 2 cup-shaped and provided with coupling opening 21, arranged to be associated, closing it, to the end of a box-shaped containment body 102 of the electric pump; and a connector-holder cover 3, associable in a mounted configuration to the coupling opening 21, in turn comprising fixing means 30 arranged to hold at least one electrical connector 300 in a preset position of connection to the electric pump 100. The bottom plate 1 has an internal aeration path 4, intended to allow the circulation—by natural convection—of the air which is heated during the operation of the electric pump 100 preventing the formation of condensate inside the bottom plate 1.

Abstract: A two-phase synchronous electric motor, comprising a permanent-magnet rotor rotating around a rotation axis, and a core lamination pack stator. First and second pairs of pole pieces define: a housing/rotation seat for the rotor. Each pole piece comprises a core, having an end associated to the core lamination pack, a free end portion facing the rotor housing/rotation seat, and a coil. The free end portion of the core of each pole piece comprises a core lamination pack extending in parallel planes to the rotation axis of the rotor. The core laminations have a variable length to form a surface of the free end portion of the core of each pole piece that is concave in the axial direction and partially wraps the rotor. A coupling between the rotor and a load is through a motion transmission joint having driving and driven elements associated in a kinematic series.