Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/16—Rectilinearly-movable armatures
  • H01F7/1638—Armatures not entering the winding

Definitions

• Electromagnetic actuator is Electromagnetic actuator.
• the invention relates to an electromagnetic actuator.
• An electromagnetic actuator generally comprises at least two coils associated with ferromagnetic cores and arranged opposite one another, and a movable element extending between the coils and associated with an actuating rod.
• the actuating rod cooperates with the end of the stem of a valve to actuate the latter.
• the coils are not integral with each other. They must therefore be placed one by one in the actuator frame, which increases the assembly time.
• Flexible cables are then attached to the coils to connect them to a power connector. This connection is made difficult by the fact that the coils are already in the chassis of the actuator, and therefore that the ends of the conductors constituting the coils are difficult to access.
• the coils comprise conductors having ends extending transversely to an axis of the coils and directly fixed to pins carried by a plate fixed on one side of the coils and comprising a connection circuit with a connector also carried by the plaque.
• the plate ensures both the electrical connection of the coils to the connector and a mechanical connection of the coils to each other.
• each end of a conductor extends in a hole in the plate and opens adjacent to a pin on a face of the plate opposite the coils.
• the end of the conductor is automatically positioned opposite a spindle when it is inserted into the corresponding hole and can be soldered to the spindle by a heating pliers whose movements are not hampered by the coils.
• the coils are covered with insulating material comprising external bosses to which the connection plate is fixed.
• the coils also include spacer blocks bearing on each other to maintain a spacing between the coils.
• the spacer blocks are integrated into the insulating material, and are formed by the external bosses.
• the coils of corresponding position of each pair have ferromagnetic cores carried by a common ferromagnetic support.
• the positioning of the coils on the common support thus achieves the start of solidification of the two pairs of coils.
• the ferromagnetic cores project from the coils on the side of the movable element. These ferromagnetic cores thus form a stop for the movable element, which prevents damage to the coils.
• FIG. 1 is an exploded perspective view of part of an actuator according to the invention
• FIG. 2 is a sectional view along II-II of Figure 1 of the actuator
• FIG. 3 is a front view of the actuator of Figures 1 and 2 after assembly;
• FIG. 4 is an enlarged perspective view of a connection pin at the end of a conductor.
• the actuator described here is suitable for controlling the opening and closing of two valves (not shown) with parallel axes.
• the actuator is substantially symmetrical along a plane P defining a separation between the elements of the actuator each intended for the control of a different valve.
• the actuator comprises two movable elements 1 mounted to slide- ment on the actuator each along an axis 100. These movable elements 1 each comprise an actuating rod or pusher 2, one end 3 of which protrudes from the actuator to cooperate with the end of the stem of a valve.
• the other end of the pusher 2 is secured to a pallet 4 extending perpendicularly to the axis 100, and forced to move between two fixed coils 5 and 6 arranged opposite one another along the axis 100.
• Each coil has a conductor 7 embedded by molding in an insulating material 8 of substantially parallelepiped shape, the conductor 7 being wound so as to provide a central hollow 9 of the coil.
• the two coils 5 are force-fitted on a common support 10 made of sheets of ferromagnetic material cut and stacked on top of each other.
• the support 10 comprises cores 11 extending in the central recesses 9 of the coils 5.
• the cores 11 are drilled to allow the passage of the pushers 2.
• the support 10 also comprises a central wing 12 and two end wings 13 framing the coils 5.
• the two coils 6 are force-fitted on a support 14 at all points similar to the support 10, with the exception of the cores of the coils 6 which are not pierced.
• the cores 11 and the wings 12, 13 of the supports 10 and 14 protrude from the facing faces of the coils 5 and 6 so as to form a stop for the pallets 4 during their movement.
• Bosses 15 are produced during the molding of the insulating material 8 to extend projecting from the facing faces of the coils 5 and 6.
• the bosses 15 of a coil form spacer blocks which cooperate with the bosses 15 of the opposite coil to maintain a determined spacing between the coils.
• the ends 16 of the conductor 7 are protruding and extend perpendicular to a lateral face 17 of the coil.
• the lateral faces 17 of the four coils form a support plane for a printed circuit 18 fixed to each coil using screws 19 each screwed into a boss 15 of a coil.
• Each end 16 extends in a bore 20 of the printed circuit 18 and opens in the vicinity of a pin 21 on a face of the printed circuit 18 opposite the coils.
• Each pin 21 has a part 22 parallel to the end 16 and welded to the latter. This part 22 is stably connected to the printed circuit 18 by a tripod 23.
• the ends of the tripod 23 pass through the printed circuit 18 to be electrically connected with conductive tracks 24 made on the face of the printed circuit opposite the coils.
• the conductive tracks 24 form a circuit connecting the ends 16 to a connector 25 carried by the printed circuit 18.
• the procedure for assembling the actuator is as follows: - the coils 5 are attached to the support 10, then the coils 6 are attached to the support 14;
• the movable elements 1 are threaded into the holes of the support 10, then the two sets of coils thus formed are presented so as to make the bosses 15 of each coil cooperate with those of the coil facing the other assembly;
• Each end 16 is welded to the adjacent pin 21, for example by means of a heating clamp ensuring a solder supply. This operation is facilitated by the fact that the pins 21 are on one side of the printed circuit 18 easily accessible, and by the fact that the pins 21 are sufficiently distant from each other to allow easy passage of such a clamp.
• the assembly of the ends 16 is thus directly wired to the connector 25 without there being any need to extend them each with a flexible cable.
• the four coils are made mechanically integral with one another by the printed circuit 18, and can therefore be transported as a whole to be placed in a chassis (not shown) of the actuator.
• all the components (pins, connector) of the printed circuit 18 are located on the same face of the latter, and can therefore be wave soldered on the printed circuit 18 before it is assembled with the coils.
• the actuator has been described with a printed circuit 18, provision may be made for the use of a plate of synthetic material in which are embedded conductors produced by stamping a metal sheet to form the connection circuit .
• the actuator has been described with a support common to two coils, this support can be replaced by two independent ferromagnetic cores, and the two coils provided with these cores are joined together by means of connection on their opposite faces.
• the external bosses of the coils serve here as spacer blocks for the coils, provision may be made for the use of spacer blocks added separately from the external bosses.
• the printed circuit is here screwed to the coils, one can provide any other type of fixing, such as clipping or bonding.
• an additional securing member for the coils with one another, for example jumpers fixed to the coils on a lateral face opposite the connection circuit.
• the printed circuit 18 has been described as bearing only the connector 25 and the pins 21, it is possible to relate to it electronic components for managing the power supply of the conductors of the coils. It is also possible to relate to it connections to a sensor associated with the mobile elements 1.

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• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Electromagnets (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 2001
  • 2001-01-15 FR FR0100459A patent/FR2819624B1/fr not_active Expired - Fee Related
• 2002
  • 2002-01-10 WO PCT/FR2002/000074 patent/WO2002056321A1/fr not_active Ceased
  • 2002-01-10 EP EP02711936A patent/EP1352402B1/de not_active Expired - Lifetime
  • 2002-01-10 DE DE60230012T patent/DE60230012D1/de not_active Expired - Lifetime
  • 2002-01-10 US US10/466,272 patent/US6946937B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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