摘要:
Method for starting a permanent magnet single-phase synchronous electric motor of simple and cost-effective implementation, said electric motor comprising a permanent magnet rotor and a stator provided with windings connected to an electrical grid by means of a switch; said method comprising the following steps; a first starting attempt (100) in which the windings are fed in current with one or more first starting impulses that are generated only during the half-periods of a first polarity of the voltage of the electrical grid; a first control step (200) in which it is detected whether a starting condition has been obtained in the course of the first starting attempt (100); in case said first control step (200) does not detect that the starting condition has been obtained within the term of the first starting attempt (100), a second starting attempt (300) in which the windings are fed in current with one or more second starting impulses that are generated only during the half-periods of a second polarity, the opposite of the first polarity, of the voltage of the electrical grid.
摘要:
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.
摘要:
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. Such 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.
摘要:
An accessory device (1) for an aquarium is described, in particular for a thermal heater (2), which may be vertically positioned. It comprises an accessory device (2) for operation of said aquarium and supporting means (4, 5) for supporting the accessory device (2) on a wall of the aquarium tank. The supporting means (4, 5) comprise a supporting body (4) which may be attached to the aquarium wall and latching means (5, 10), which are integral with the accessory device (2) and may be removably associated with said supporting body (4). The supporting body (4) supports the latching means (5, 10) and the accessory device (2) and allows selection of vertical position of accessory device (2) with respect to supporting body (4).
摘要:
A pump (2') for dishwashing machines is described, comprising an electric motor (21'), an impeller (23') and electronic motor control circuitry (27'), the electric motor (21') being able to rotate the impeller (23'), the electronic motor control circuitry (27') being able to control the electric motor (21'). Advantageously, the electronic motor control circuitry (27') is structured to control the electric motor (31') of an additional pump (3'). Furthermore, a pump assembly for a dishwashing machine (6') is described, comprising a master pump (2') and at least one slave pump (3'), the master pump (2') being of above said type, the at least one slave pump (3') being electrically connected to the electronic motor control circuitry (27') and being electronically controlled by the electronic motor control circuitry (27'). A dishwashing machine (1') is also described, comprising a pump assembly of above said type, the dishwashing machine (1') being hydraulically connected, on the inlet side, by means of suction, to the water distribution system, through the at least one washing pump (2') and being connected, on the outlet side, to the water distribution system or to a drain, through the at least one discharge pump (3').