EP2659115A1 - Dispositif electromagnetique et actionneur electromagnetique correspondant - Google Patents
Dispositif electromagnetique et actionneur electromagnetique correspondantInfo
- Publication number
- EP2659115A1 EP2659115A1 EP11815471.5A EP11815471A EP2659115A1 EP 2659115 A1 EP2659115 A1 EP 2659115A1 EP 11815471 A EP11815471 A EP 11815471A EP 2659115 A1 EP2659115 A1 EP 2659115A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coils
- electromagnetic device
- electromagnetic
- actuator
- litz wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
-
- 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
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
- H01F7/1816—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current making use of an energy accumulator
-
- 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
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
- H01F7/1816—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current making use of an energy accumulator
- H01F2007/1822—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current making use of an energy accumulator using a capacitor to produce a boost voltage
Definitions
- the present invention relates to an electromagnetic device, electromagnet type. It also relates to a corresponding electromagnetic actuator.
- the invention relates to the field of electromagnetic actuators used in automotive applications.
- electromagnetic actuators are used.
- An actuator is here understood to mean a device capable of acting in response to an electrical command.
- an actuator is provided with at least one inductor (or self inductance) which, when traversed by a current, causes the displacement of a moving part.
- the actuator In the case of an electromagnetic valve, the actuator generally consists of two electromagnets: one is dedicated to opening the valve and the other to closing the valve.
- the valve is mechanically connected to a pallet which is located in the air gap of the electromagnets.
- the pallet is attracted by one or the other of the electromagnets by electromagnetic forces when the electromagnets are magnetized and it is recalled in the center of the air gap by springs.
- a microcontroller calculates PWM (“Pulse Width Modulation") signals for controlling the current flowing in the high frequency electromagnets to about 120 kHz.
- Actuator control usually takes place from a DC voltage source. Therefore, it is often necessary to adopt an H-bridge architecture to control this actuator in the four quadrants.
- Such an overvoltage generator is generally connected to the H bridge in which the inductor of the actuator is located.
- the Applicant has carried out work in this direction to develop a control device of an actuator and simultaneous lifting of the voltage, which allows a saving of space by reusing components of the actuator to achieve the overvoltage.
- the Applicant has developed an electromagnetic device comprising two magnetically coupled coils and adapted to ensure, in a first operating mode driving a mobile element and in a second operating mode a voltage conversion.
- the present invention aims to remedy this disadvantage.
- the invention firstly relates to an electromagnetic device comprising two magnetically coupled coils adapted to ensure, in a first operating mode, the driving of a mobile element and, in a second operating mode, a voltage conversion. device in which each coil has a multiple conductor structure, isolated from each other, to reduce the skin effect on the coils.
- the use of a coil having a structure with multiple conductors, isolated from each other, to reduce the skin effect on the coils in the electromagnet of an electromagnetic actuator for driving a movable element, particularly in translation, is an invention in itself, in particular in the case of an actuator powered at very high frequency.
- an intermediate terminal intended to be connected to a power supply source is provided between the two coils.
- each coil having a multiple conductor structure, isolated from each other, to reduce the effect of skin, is an invention in itself, particularly in the case of an electromagnetic device powered at very high frequency.
- the two coils have the same number of turns, the intermediate terminal being then a midpoint.
- the supply currents coming from the power source flow in the two coils in opposite directions and according to values proportional to the number of turns of the coil traversed so that when a current is sent in the first coil and the opposite current in the second coil, their mutual effects are canceled, said currents having a ratio equal to the ratio of the number of turns of the first and the second coil.
- no electromotive force is created by all of the two coils.
- the conductors are strands of circular section twisted together to form a Litz wire.
- Litz wire is particularly suitable for high frequency current transmission.
- each turn of the two coils comprises a number of twisted strands pitch between 8 and 16, in particular equal to 12.
- the number of twisted strands forming the Litz wire is between 5 and 12, and preferably equal to 7. This indeed makes it possible to have a good compromise between the total section of the Litz wire, which is wishes to be as high as possible to reduce the resistance of the wire and therefore the losses, and the thickness of the coil which must be minimized to ensure its integration into the device.
- the Litz wire has a section approximately equal to 1 mm 2 .
- This section is particularly suited to the control frequencies of electromagnetic valves.
- the conductors are copper strips. This variant uses less insulation. It thus makes it possible to have a better filling of the coil in conductors.
- the copper strips used have a thickness of between 0.4 and 0.5 mm.
- the coils have turns of rectangular shape. This embodiment is particularly suitable for actuating two electromagnetic valves.
- the coils have square-shaped turns. This variant is particularly suitable for the actuation of a single electromagnetic valve.
- the present invention also provides an electromagnetic valve actuator comprising the electromagnetic device of the invention.
- FIG. 1 is a diagram showing an electromagnetic actuator comprising an electromagnetic device according to one embodiment of the invention
- FIG. 2 represents a coil portion of the electromagnetic device according to a first embodiment of the invention
- FIG. 3 shows a sectional view along the axis A-A of a Litz wire of the coil of Figure 2;
- FIG. 4 represents a coil of the electromagnetic device according to a second embodiment of the invention.
- FIG. 1 represents an electromagnetic actuator 2 comprising an electromagnetic device 4 capable of providing, in a first operating mode, the driving of a mobile element and, in a second operating mode, a voltage conversion, in particular an increase in voltage.
- the movable element is, for example, an electromagnetic valve of a motor vehicle engine driven, in particular, in translation. It comprises a pallet 6, intended to bear against said device in an open position of the valve and to be at a distance from said device in a closed position of the valve.
- the electromagnetic device 4 comprises two coils 8 and 10 each having an inductance L1 and L2 respectively.
- leakage inductances Lf1 and Lf2 are nevertheless very small so that they do not disturb the control of the actuator 2 to drive the mobile element 6. Moreover, the effects of the inductances L1 and L2 cancel each other out. The voltage rise does not disturb the actuator.
- the two coils 8 and 10 are coupled by their magnetic core which is the same for the two coils 8 and 10.
- a power source 14 is connected to the midpoint 12.
- the power source 14 has a voltage of 12 V.
- the current I B from the power source 14 allows to raise the voltage (that is to say to achieve an overvoltage) across a load 16 which is a capacitor.
- the voltage rise is controlled by controlling the current I B through four switching elements Q1, Q2, Q3 and Q4 which are for example MOS transistors.
- the coils 8 and 10 and the four switching elements Q1, Q2, Q3 and Q4 form an H bridge, in which the two coils 8 and 10 form the horizontal bar of the H, the two transistors Q1 and Q3 form a first arm of the H and the two transistors Q2 and Q4 form a second arm of H.
- the load 16 is connected in parallel with the second arm of the H-bridge.
- the switching elements Q3 and Q4 are closed so as to magnetize the leakage inductances Lf1 and Lf2;
- Q3 and Q4 are opened and Q1 and Q2 are closed so that the magnetic energy stored by Lf1 and Lf2 is discharged into the capacitor 16, which makes it possible to raise the voltage across this capacitor 16.
- the current required to control the actuator is obtained by closing Q1 and Q3 while Q2 and Q4 are open, and vice versa.
- a disadvantage of this assembly consists in the presence of losses in the conductors of the coils 8 and 10.
- the two coils 8 and 10 have a multi-conductor structure, isolated from each other, to reduce the skin effect on the coils in order to reduce losses by Joule effect.
- the conductors of the two coils 8 and 10 are strands of circular section twisted together to form a Litz wire.
- FIG. 2 represents a coil portion 8 (or 10) formed of a winding of Litz wire 20 in a number of turns including, for example, between 15 and 25, equal to 20 for example.
- the turns are, for example, rectangular (only half of a coil being illustrated in Figure 2) so that the coils are adapted to be integrated in particular in an actuator of two solenoid valves.
- the turns have a square shape so that the coils are adapted to be integrated in an actuator of a single electromagnetic valve.
- This Litz wire 20 comprises between 5 and 12 twisted strands. According to a preferred example, the Litz wire 20 comprises 7 twisted strands, as is clearly shown in FIG.
- the twisted strands of the Litz wire 20 are arranged such that there is a central strand 22 and 6 strands 24, 26, 28, 30, 32 and 34 surrounding the central strand.
- the Litz wire 20 has a section of 1 mm 2 .
- the number of twist steps of the strands of the Litz wire is chosen equal to 12 twist steps per turn or for a turn of total length equal to about 17 cm, the twist pitch is thus equal to 14 mm .
- This choice makes it possible to have the flexibility required by the Litz wire 20 to go around the coil and to minimize the risk of separation of the strands constituting the Litz wire.
- the coils 8 and 10 are formed of a winding of copper strips 40.
- the number of copper strips is in particular between 15 and 25, for example equal to 20 .
- Each copper strip 40 preferably has a thickness e of between 0.4 and 0.5 mm.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Electromagnets (AREA)
- Magnetically Actuated Valves (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1061362A FR2970108B1 (fr) | 2010-12-30 | 2010-12-30 | Dispositif electromagnetique et actionneur electromagnetique correspondant. |
PCT/FR2011/053094 WO2012089962A1 (fr) | 2010-12-30 | 2011-12-20 | Dispositif electromagnetique et actionneur electromagnetique correspondant |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2659115A1 true EP2659115A1 (fr) | 2013-11-06 |
EP2659115B1 EP2659115B1 (fr) | 2018-07-25 |
Family
ID=44475184
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11815471.5A Not-in-force EP2659115B1 (fr) | 2010-12-30 | 2011-12-20 | Dispositif electromagnetique et actionneur electromagnetique correspondant |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2659115B1 (fr) |
JP (1) | JP5918267B2 (fr) |
FR (1) | FR2970108B1 (fr) |
WO (1) | WO2012089962A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9599246B2 (en) * | 2015-08-05 | 2017-03-21 | Dayco Ip Holdings, Llc | Magnetically actuated shut-off valve |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1375041A (fr) * | 1962-06-07 | 1964-10-16 | Bbc Brown Boveri & Cie | Procédé et dispositif pour la fabrication des bobines à haute fréquence avec un conducteur à brins multiples |
EP1060482A1 (fr) * | 1998-12-03 | 2000-12-20 | FEV Motorentechnik GmbH & Co. KG | Electroaimant dote d'un boitier plastique et destine notamment a un actionneur electromagnetique |
YU49125B (sh) * | 1999-06-29 | 2004-03-12 | Milan Dr. Prokin | Mostni pojačivač sa podizačem napona |
JP2004186628A (ja) * | 2002-12-06 | 2004-07-02 | Koito Mfg Co Ltd | トランス |
JP2005303164A (ja) * | 2004-04-15 | 2005-10-27 | Nagano Japan Radio Co | 高周波コイル部品およびその製造方法 |
US7036469B2 (en) * | 2004-06-21 | 2006-05-02 | Ford Global Technologies, Llc | Bi-directional power electronics circuit for electromechanical valve actuator of an internal combustion engine |
DE102008012942A1 (de) * | 2007-04-19 | 2008-10-23 | Volkswagen Ag | Vorrichtung und Verfahren zur Ansteuerung einer induktiven Last |
FR2924873B1 (fr) * | 2007-12-07 | 2011-11-25 | Valeo Sys Controle Moteur Sas | Circuit de controle du courant dans un organe electrique de commande ou de la tension aux bornes dudit organe electrique de commande |
GB2463935B (en) * | 2008-10-01 | 2013-06-19 | 3Di Power Ltd | Inductor for high frequency applications |
-
2010
- 2010-12-30 FR FR1061362A patent/FR2970108B1/fr not_active Expired - Fee Related
-
2011
- 2011-12-20 JP JP2013546753A patent/JP5918267B2/ja not_active Expired - Fee Related
- 2011-12-20 WO PCT/FR2011/053094 patent/WO2012089962A1/fr active Application Filing
- 2011-12-20 EP EP11815471.5A patent/EP2659115B1/fr not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2012089962A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2014509069A (ja) | 2014-04-10 |
JP5918267B2 (ja) | 2016-05-18 |
WO2012089962A1 (fr) | 2012-07-05 |
EP2659115B1 (fr) | 2018-07-25 |
FR2970108A1 (fr) | 2012-07-06 |
FR2970108B1 (fr) | 2013-01-11 |
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