Abstract:
A relay magnet usually comprises a coil, a soft iron core and a reed moving in accordance with the magnetic field induced in the coil. The invention concerns a method for reducing production costs and consumption, in particular when the reed is maintained in closed position, which consists in replacing the soft iron core with ordinary steel. The reed is maintained in closed position by the retentivity of the core. In order to reduce consumption during demagnetisation, the energy accumulated during magnetisation is stored in a capacitor (C1) to be applied to the coil during demagnetisation.
Abstract:
The invention relates to a drive system (20) for a circuit breaker. The drive system comprises an electromagnetic actuator (10) having a first coil (14), a second coil (15), and an armature (12) arranged to be movable between a first and a second end position by means of the coils (14, 15). In accordance with the invention the coils (14, 15) are arranged in an anti-series connection, and both coils (14, 15) are energized simultaneously for effectuating the movement of the armature (12) between the two end positions. This is in contrast to the prior art, wherein the coils are energized one at a time; one coil for moving the armature to one of the end positions and the other coil for moving the armature to the opposite end position.
Abstract:
An electrical driver circuit for a cantilever solenoid valve includes first and second electrical switching devices for converting logical control input signals into respective control outputs. Third and fourth electrical switching devices are controlled as a function of the control output produced by the first switching device. Fifth and sixth electrical switching devices are controlled as a function of the control output produced by the second switching device. A voltage potential difference is created between a first electrically common point, defined between the third and fourth switching devices, and a second electrically common point, defined between the fifth and sixth switching devices, as a function of the logical signals received into the first and second switching devices.
Abstract:
Die Erfindung betrifft eine Aktuatorvorrichtung (6) mit einem elektromagnetischen Aktuator (2), welcher zwei Magnetspulen (4, 5) sowie ein mittels derselben zwischen drei stabilen Positionen linear verlagerbares Stellglied (3) aufweist, wobei die Aktuatorvorrichtung (6) zur Ansteuerung der Magnetspulen (4, 5) eine Schaltbrücke (9) mit drei parallel geschalteten Brückenzweigen (B1, B2, B3) aufweist, wobei jeder Brückenzweig (B1, B2, B3) zwei in Reihe angeordnete Schalter (S1... S6) aufweist, wobei in jede der zwei Brückendiagonalen (D1, D2) je eine Magnetspule (4, 5) geschaltet ist. Ferner betrifft die Erfindung ein Verfahren zur Ansteuerung der Magnetspulen (4, 5) eines elektromagnetischen Aktuators (2) einer erfindungsgemäßen Aktuatorvorrichtung (6).
Abstract:
The invention relates to a bistable electromagnetic actuator that comprises a magnetic circuit (12) including a magnetic yoke (20) in which a shunt (26) extends perpendicularly to a longitudinal axis (Y) of said yoke, and including a permanent magnet (14) provided between the first face (22) of the yoke and the shunt (26). A mobile core (16) is mounted so as to be capable of axial sliding between a latching position and a release position. A coil (30, 30A, 30B) extending between the shunt (26) and a second face (24) of the yoke generates a first control magnetic flow (fC1 ) for moving the mobile yoke (16) from the release position (PD) to the latching position (PA). A second control magnetic flow (fC2 ) allows the movement of the yoke (16) from the latching position to the release position (PD) under the action of a return spring (36, 37).
Abstract:
An electromagnetic actuator with flux feedback control includes two poles located on opposite sides of a soft-magnetic target. A bias flux is introduced that flows into both poles. Magnetic circuitry may be designed so that the total bias flux is independent or substantially independent of a position of the target with respect to the poles or the control flux. The electromagnetic actuator also includes flux sensors introduced into each gap between the poles and the target. The electromagnetic actuator further includes an actuator control circuit to command the current in the control coil to bring a difference between the readings of the two flux sensors to a targeted level. In some aspects, the force exerted on the actuator target in this arrangement may be proportional to the command signal regardless of the position of the actuator target, MMF drop in the soft-magnetic parts of the magnetic circuit, or the frequency.
Abstract:
Actionneur électromagnétique bistable comprenant un circuit magnétique (12) comprenant une culasse (20) magnétique dans laquelle un shunt (26) s'étend perpendiculairement à un axe longitudinal (Y) de ladite culasse et comprenant un aimant permanent (14) positionné entre une première face (22) de la culasse et le shunt (26). Un noyau (16) mobile est monté à coulissement axial entre une position d'accrochage et une position de décrochage. Une bobine (30, 3OA, 30B) s'étendant entre le shunt (26) et une seconde face (24) de la culasse est destinée à engendrer un premier flux magnétique de commande (φC1 ) pour déplacer le noyau (16) mobile d'une position de décrochage (PD) à une position d'accrochage (PA). Un second flux magnétique de commande (φC2) autorise le déplacement du noyau (16) de la position d'accrochage vers la position de décrochage (PD) sous l'action d'un ressort de rappel (36, 37).
Abstract:
An electromagnetic actuator (100) is capable of providing a high speed driving force, for example, for driving the contacts of a circuit breaker or similar power distribution equipment. The electromagnetic actuator may use a directly powered moving coil element (110) in combination with one or more energized stationary coils (106,108) to generate an output force using reduced requirements for current, voltage and current/voltage rate-of-change. Precise control of actuator motion is obtained by permitting different supply voltages, firing times and capacitor supplies. The electromagnetic actuator (100) may further incorporate a return spring arrangement (138) and a magnetic latch arrangement (120).
Abstract:
Selon l'invention, l'actionneur comprend deux structures magnétiques fixes (32 1 , 34 1 ) (32 2 , 34 2 ) et une partie magnétique mobile (36) apte à se déplacer vers l'une ou l'autre des deux extrémités des structures magnétiques. L'actionneur est de préférence réalisé sous forme de microactionneur. Application à la réalisation de microrelais, microvannes, micropompes, etc.