WO2024121286A1 - Soupape magnétorhéologique - Google Patents

Soupape magnétorhéologique Download PDF

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Publication number
WO2024121286A1
WO2024121286A1 PCT/EP2023/084657 EP2023084657W WO2024121286A1 WO 2024121286 A1 WO2024121286 A1 WO 2024121286A1 EP 2023084657 W EP2023084657 W EP 2023084657W WO 2024121286 A1 WO2024121286 A1 WO 2024121286A1
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WO
WIPO (PCT)
Prior art keywords
valve
core
chamber
mrf
epm
Prior art date
Application number
PCT/EP2023/084657
Other languages
English (en)
Inventor
Sofia NTELLA
Adrien Thabuis
Bhawnath TIWARI
Christian Koechli
Kenny JEANMONOD
Yves Perriard
Zoltan PATAKY
Original Assignee
Ecole Polytechnique Federale De Lausanne (Epfl)
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Ecole Polytechnique Federale De Lausanne (Epfl) filed Critical Ecole Polytechnique Federale De Lausanne (Epfl)
Publication of WO2024121286A1 publication Critical patent/WO2024121286A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/08—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet
    • F16K31/082—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet using a electromagnet and a permanent magnet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
    • F16F9/535—Magnetorheological [MR] fluid dampers
    • F16F9/537—Magnetorheological [MR] fluid dampers specially adapted valves therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K13/00—Other constructional types of cut-off apparatus; Arrangements for cutting-off
    • F16K13/08—Arrangements for cutting-off not used
    • F16K13/10—Arrangements for cutting-off not used by means of liquid or granular medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0675—Electromagnet aspects, e.g. electric supply therefor

Definitions

  • the present invention relates to the field of valves and in particular to so-called magnetorheological valves. More specifically, the present invention concerns a valve comprising a housing having a peripheral structure made of a magnetic field conductive material and a core disposed in said housing, the core and the peripheral structure delimiting a first chamber disposed on one side of the core, a second chamber disposed on another side of the core, and at least one channel formed between the peripheral structure and said core, this channel connecting said first chamber to said second chamber, the housing containing a magnetorheological fluid (MRF).
  • MRF magnetorheological fluid
  • the present invention further concerns a control system comprising a valve as defined above.
  • the invention also concerns a method for controlling a valve as defined above.
  • Power transmission is omnipresent in engineering. It involves the conversion of energy into different forms and its distribution to different systems. This can be achieved using electrical, mechanical or fluid technologies.
  • fluid power transmission systems offer the advantages of a high power-to-weight ratio, the ability to handle high magnitude forces and torques compared to mechanical transmissions, and increased heat transfer capability.
  • fluid systems There are two main types of fluid systems; hydraulic which use incompressible liquids such as oil, water or other types of fluids; and pneumatic which use neutral gases such as air. Because of these aforementioned advantages, power transmission based on fluid systems is used in a wide range of applications.
  • hydraulic systems are key components in robotic manipulators and play an important role in the automation of industrial activities.
  • Valves are an integral component for controlling the direction and flow rate in fluidic systems.
  • Solenoid valves have been used as a cost effective and accurate solution, as well as active mechanical valves based on thermal or elastomeric principle.
  • DEAs Dielectric Elastomer Actuators
  • ERF electrorheological fluid
  • MRF magnetorheological fluid
  • a conventional magnetorheological (MR) valve is cylindrical and consists of several parts. First, a coil is wound around a ferromagnetic rod.
  • This part is covered at the top and bottom by two ferromagnetic discs . Additionally, a cylindrical ferromagnetic structure surrounds the first part. A gap is formed between the two structures, allowing the vertical flow of the MRF.
  • the internal structure acts as an electromagnet. When a DC current is applied to the coil, it imposes a magnetic flux density B in the active regions of the gap (See Fig.1). The flux density is perpendicular to the fluid flow in the active regions. Accordingly, the particles form chain-like structures, aligned with the magnetic field lines. As a consequence, the MRF viscosity ⁇ increases in the active regions and the fluid flow rate Q decreases. This results in an increase in the pressure difference ⁇ P developed between the two sides of the valve.
  • a conventional MRF valve can be in open or closed state. When closed, the valve sustains a given pressure, which means that if a pressure below a threshold value is applied to the MRF on one side of the valve, the MRF will not flow to the other side of the valve. If the pressure applied to the MRF is above the threshold value however, the MRF will flow to the other side of the valve. Depending on the application, the threshold value should be as high as possible.
  • the threshold pressure is fixed and given by the design of the valve. It would be interesting to create a valve where this threshold pressure can be adjusted according to the specific needs of the application.
  • the development of MRF valves has influenced the mechatronic applications due to the ease of interface between electronic controls and mechanical components.
  • One of the most challenging aspects of MRF valves is the difficulty in miniaturising the device while at the same time improving the achievable performance. Therefore, there is a need for a valve that can withstand high loads in a small volume and has a power consumption as low as possible.
  • the present invention proposes to overcome the drawbacks of the valves of the prior art by proposing a new valve capable of withstanding high loads in a small volume and in which the power consumption is very low.
  • the threshold pressure i.e., the pressure above which the valve in closed state opens, can be set or selected by a user.
  • EPM electropermanent magnet
  • Such an electropermanent magnet can be defined as a magnet whose polarity can be selected by an electric pulse and which maintains its polarity as long as an electric pulse of opposite direction is not received by this magnet.
  • a control system as defined in the preamble and characterized in that said control system comprises a control module arranged to transmit to said coil, an electric pulse having a direction chosen so as to open or close said valve.
  • a method for controlling a valve as described in the preamble and characterized in that said method comprises the steps consisting of: - choosing whether the valve should be open or closed; - apply an electric pulse to the coil surrounding the core of the EPM so that the core allows the passage of the MRF through the channel, from one of said first or second chamber to the other chamber in the event that the valve must be opened; and - applying an electrical pulse to the coil surrounding the core of the EPM such that the core prevents the passage of the MRF through the channel, from one of said first or second chambers to the other chamber if the valve needs to be closed.
  • the present description proposes a miniaturized MRF valve with high efficiency in terms of sustained pressure and energy consumption.
  • the proposed valve is designed to control hydraulic systems using MRF as filling fluid.
  • the Magnetorheological fluid (MRF) is used both as an actuation fluid and as control medium.
  • the function of the valve is binary, operating either in the on-state, completely blocking the flow rate, or in the off-state, allowing the fluid to flow.
  • the pressure sustaining capability of the valve is however tuneable.
  • the goals of the invention are achieved by a valve using a magnetorheological fluid (MRF) and an electropermanent magnet (EPM), instead of an electromagnet to impose the magnetic flux density in the active regions of the valve.
  • MRF magnetorheological fluid
  • EPM electropermanent magnet
  • EPM valve the coil is used in a pulsed manner to magnetize or demagnetize the inner magnetic rod, closing or opening the valve respectively.
  • a careful choice of magnetic material is necessary to construct an EPM.
  • it is made of a ferromagnetic material with a high remanent magnetization and a low magnetizing field (i.e., soft ferromagnetic material). Whether a ferromagnetic material is a hard or a soft magnet depends on the strength of the magnetic field needed to align the magnetic domains. This property is characterized by the coercivity H c .
  • Hard magnets have a high coercivity (H c ), and thus retain their magnetization in the absence of an applied field, whereas soft magnets have low values.
  • soft magnetic materials are easily magnetised and demagnetised. They typically have intrinsic coercivity less than 1000 Am -1 .
  • the other main parameters of interest in addition to the coercivity are the saturation magnetisation and the electrical conductivity.
  • the valve comprises an EPM which is added in the traditional structure of a MRF valve with the goal of decreasing its power consumption. This enables achieving a low volume design, but with high sustained pressure capability.
  • ⁇ Figure 1 is a sectional view of an annular MR valve; this figure illustrates a valve of the present invention as well as a valve of the prior art;
  • ⁇ Figure 2a is a cross section view of a valve of the prior art, in the embodiment of Figure 1;
  • ⁇ Figure 2b is a cross section view of a valve of the invention, in the embodiment of Figure 1;
  • ⁇ Figure 3a illustrates the operating principle of a MRF valve having an electromagnetic core, based on an ideal M-H characteristic and shows a first way of demagnetizing the core;
  • ⁇ Figure 3b is similar to Figure 3a and shows a second way of demagnetizing the core;
  • ⁇ Figure 4 represents a 2-D axisymmetric simulation of the magnetic flux density in the MRF valve with EPM rod;
  • ⁇ Figure 5a illustrates hydraulic scheme of an experimental setup of the valve of the invention;
  • FIG. 1 illustrates a magnetorheological fluid (MRF) valve of the prior art as well as a MRF valve according to the invention.
  • MRF magnetorheological fluid
  • FIG. 2a specifically illustrates a valve 10 of the prior art
  • Fig.2b specifically illustrates a valve 10 of the invention.
  • the valve 10 comprises a housing 11 having a peripheral structure 12 made of a magnetic field conductive material.
  • the valve 10 further comprises a core 13 disposed in said housing 11.
  • the core 13 and the peripheral structure 12 delimit a first chamber 14 disposed on one side of the core 13, a second chamber 15 disposed on another side of the core 13 and at least one channel 16 formed between the peripheral structure 12 and the core 13. This channel 16 connects said first chamber 14 to said second chamber 15.
  • the housing 11 further contains a magnetorheological fluid (MRF).
  • MRF magnetorheological fluid
  • the core 13 comprises a coil 17 that is wound around a ferromagnetic rod 18. This part is covered by a first ferromagnetic disc 19 on the top and by a second ferromagnetic disc 20 on the bottom.
  • the ferromagnetic peripheral structure 12 forms the sidewalls of the valve, surrounding the core 13. A gap formed between the core 13 and the peripheral structure 12 forms the channel 16 which allows the MRF to flow between the chambers 14, 15.
  • the inner structure acts as an electromagnet.
  • the coil 17 When the coil 17 is supplied by a DC current, it imposes a magnetic flux density B in the active regions of the channel 16. The flux density is perpendicular to the fluid flow in the active regions and the valve is closed.
  • the MRF in the active regions is shown in Fig.1 with and without a magnetic field.
  • the core 13 does not comprise a coil and a ferromagnetic rod acting as an electromagnet, but comprises a tagepermanent magnet (EPM) 21. This EPM comprises an inner magnetic rod 18 surrounded by the coil 17.
  • This coil is used in a pulsed manner to magnetize or demagnetize the inner magnetic rod 18, thus respectively closing or opening the valve.
  • a careful selection of the magnetic material is required to construct an EPM.
  • it is made of a ferromagnetic material with a high remanent magnetization and a low magnetizing field (i.e., soft ferromagnetic material).
  • AlNiCo-5 for the device of the invention.
  • the latter offers the possibility of storing magnetic energy, without a continuous power supply.
  • the ability of the valve to sustain pressure up to 1010 kPa for a volume of 353 mm 3 is experimentally demonstrated.
  • FIG. 3a and 3b illustrate the operation principle of a valve 10 according to the invention, based on an ideal M-H characteristic of a device having a core 13 made of AlNiCo-5. The magnetic flux of the valve is shown in the magnetized and demagnetized states.
  • Figure 3a illustrates a first way of demagnetizing the inner magnetic rod 18.
  • FIG. 3b illustrates a second way of demagnetizing the rod 18.
  • a negative pulsed external field is applied until the remanence coercivity is reached.
  • the white arrow represents the magnetization direction of the rod.
  • the magnetizing field H, external to the material, is the one generated by the coil 17 and is proportional to the ampere-turn product: N ⁇ I, with N the number of turns of the coil, and I the electric current flowing through it.
  • Figures 3a and 3b also show two possible modes of operation of the valve 10 which are illustrated by the magnetization curve (M-H characteristic) of the AlNiCo-5.
  • M-H characteristic The non-linear relationship between permeability and magnetizing field ⁇ r (H), results in different magnetization for the same magnetizing field.
  • ⁇ r (H) results in different magnetization for the same magnetizing field.
  • such material exhibits hysteresis (i.e., the magnetization depends on its history). This, usually undesirable behavior is exploited here to operate the electropermanent magnet.
  • the external magnetic field in which the AlNiCo-5 is placed (i.e., the magnetizing field)
  • there are two ways of demagnetizing a magnetic material there are two ways of demagnetizing a magnetic material.
  • the first one is illustrated by Fig.3a and consists in applying a decaying oscillating external magnetic field, which enables reaching the origin of the M-H curve despite the hysteresis of the material and for any initial state of the material (its history).
  • the second method is illustrated by Figure 3b and consists in applying a negative external magnetic field so as to reach the remanence coercivity of the material, leading to a demagnetized state when the external field is removed. This should not be confused with the intrinsic coercivity which corresponds to zero magnetization of the material under a specific external magnetic field ). Indeed, the hysteretic behavior of the material would result in a non-null residual magnetization when the external magnetic field is removed.
  • the remanence coercivity is a theoretical state that is difficult to reach precisely in practice and as a result, a perfect demagnetization is not achieved. Nevertheless, the remaining magnetization can be considered small enough in many applications such as this one.
  • the second method is preferred in this work because it requires a single demagnetization pulse implemented with a simple electronic design. If partial magnetization of the valve is desired (tunability of the sustained pressure as explained later), the first method should be considered as it is more robust and independent of the magnetization state.
  • electropermanent magnets comprising two different ferromagnetic materials (i.e., magnets) placed in parallel with each other and between two pieces of iron.
  • the chosen strategy to demagnetize the rod 18 is to use a single negative current pulse reaching the remanence coercivity of the material (as shown in Fig. 3b).
  • magnet manufacturers do not provide the characteristics of this state because it is based on highly non-linear phenomena and depends on the magnetization state as well as on the rod environment.
  • the negative current I coer i required to achieve the intrinsic coercivity is therefore derived. It will be used as an upper limit to experimentally determine the correct demagnetizing current I to approach the remanence coercivity (I i demag demag ⁇ Icoer ). Due to the numerous non-linearity phenomena occurring in the valve, some assumptions are made. First, the core 13 made of iron is assumed to be a perfect magnetic conductor.
  • MRF-132DG magneto- rheological fluid https://lordfulfillment.com/pdf/44/DS7015_MRF- 132DGMRFluid.pdf
  • ⁇ ⁇ The relationships between the magnetic field and magnetic flux density in the channel 16 can be deduced: .
  • An exponential curve fitting is performed separately for the magnetization and demagnetization parts of the B-H characteristic of the AlNiCo-5 rod 18 obtained experimentally by the German company MagnetPhysik (shown in Fig.3a). They are represented with the following equations: TABLE I: Characteristics of MRF valve and AlNiCo-5 material properties.
  • the current that reaches the remanence coercivity of the material cannot be derived analytically.
  • the current reaching the intrinsic coercivity is used to provide an upper bound to the demagnetization current that will be determined experimentally.
  • ⁇ P max ⁇ ⁇ P ⁇ the maximum pressure difference sustained by the valve 10 is approximated by ⁇ P max ⁇ ⁇ P ⁇ , and c lies close to 3.
  • the quantity of MRF surrounding the valve is large, leading to flux fringes that need to be accounted for in our model.
  • the distribution of the flux density in the channel 16 is necessary.
  • a 2-D axisymmetric magneto-static simulation of the valve is performed using the FEMM 4.2 software.
  • Fig.4 corresponds to the fully magnetized state of the rod in AlNiCo-5 (using the corresponding B-H characteristic) without current in the coil 17.
  • the distribution of the magnetic flux density along the dotted line (see Fig.4) in the middle of the channel in the active regions can thus be evaluated.
  • flux fringes are undesirable in magnetic devices, in our case, they lead to an increase in the sustained pressure, improving the performance of our device.
  • Table I The characteristics of the proposed valve and the key properties of the M-H and B-H characteristics of the AlNiCo-5 are presented in Table I.
  • the total volume V of the valve is 353.25 mm 3 , which classifies it among the miniaturized versions of valves.
  • the setup presented in Figures 5a, 5b and 5c is used to perform the experimental validation of the device of the invention.
  • This setup comprises a cylindrical structure 21 with a first chamber 14’ and a second chamber 15’ that are separated by the MR valve 10.
  • the first chamber 14 of the valve 10 is in fluidic communication with the first chamber 14’ of the cylindrical structure 21 while the second chamber 15 of the valve 10 is in fluidic communication with the second chamber 15’ of the cylindrical structure 21.
  • Both first and second chambers 14, 15 of the valve 10 are filled with the MRF (MRF132DG by Lord Corp.).
  • the second chamber 15’ is open and, thus, in atmospheric pressure.
  • a pneumatic piston 22 is inserted into the first chamber 14’ of the cylindrical structure.
  • the movement of the piston 22 can reduce the volume of the first chamber 14’ of the cylindrical structure. This increases the pressure in the latter when the valve is closed or creates fluid flow when the valve is open.
  • a sectional view of the setup shows the internal part of the chambers, as well as the arrangement placement of the valve.
  • Two pressure sensors 23 (PFT510 Miniature Pressure Sensor by Futek) measure the pressure in each chamber 14’, 15’ of the cylindrical structure 21.
  • a laser displacement sensor 21 (LK-G3000 by Keyence) measures the displacement of the pneumatic piston 22 over time. Wires of the coil 17 exit the second chamber 15 and are connected to the electronics that perform valve switching.
  • a current probe measures the current flowing in the coil 17. Activation and deactivation of the valve 10 are achieved by applying current pulses to the coil 17. A positive pulse magnetizes the AlNiCo-5 rod 18 and closes the valve 10, while a smaller negative pulse demagnetizes the rod 18 and opens the valve 10.
  • a full- bridge arrangement of MOSFETs allows the coil to be supplied with current in both directions.
  • the IPB054N08N3-G MOSFETs from Infineon Technologies are used for faster switching (Nchannel type), with maximum voltage and current ratings of 80V and 80A respectively.
  • Two gate drivers ICs FAN7842 from Fairchild Semiconductor Corp. (one per pair of MOSFETs) are used to drive the gates of the transistors, increasing the switching speed.
  • the gate drivers are controlled with a F401-RE Nucleo board from ST.
  • the M-H and B-H characteristics acquired experimentally by the German company Magnet-Physik are plotted together in Fig.6.
  • the light gray dotted curve 30 represents the magnetization M over H and the dark dotted curve 31 represents the magnetic flux density B over H.
  • These curves represent the AlNiCo-5 rod from a fully demagnetized condition to the saturation point, after imposing an external field.
  • FIG. 9 shows that by decreasing the magnetization current at 5.1 A and, thus, decreasing also the energy consumed, it is possible to reach magnetization close to the saturation M sat .
  • the marked points depicted in Fig. 6 have been obtained analytically and numerically according to the simulation of Fig. 4 for the different fixed current values (0 A, 5.1 A, 7.4 A). The analytical and simulation results match with an estimation error of less than 6%.
  • Fig. 7 shows the voltage across the coil 17 and the current measured during magnetization and demagnetization of the rod. Positive values result in the magnetization of the inner magnetic rod 18, while negative values result in its demagnetization. Both magnetization and demagnetization are achieved with a single current pulse for each one.
  • the first demagnetization method proposed in Fig. 3a could be used to overcome this limitation.
  • the switching frequency is 0.85 kHz for 50% duty cycle and 1.25 kHz for 90% duty cycle.
  • the first one examines the comparison between the open and closed state of the valve 10.
  • the inner magnetic rod 18 is magnetized with the piston pressure, and consequently, the pressure in the first chamber 14, is set and controlled manually with a manometer.
  • the displacement of the piston and the pressure difference between the two sides of the valve i.e., between the first and second chambers 14 and 15
  • Fig.8 curve with circles
  • there exists an initial abrupt increase of displacement of maximum ⁇ x 10 mm, which remains constant as the pressure difference increases.
  • valves constitute an essential component of the control of fluidic power transmission systems.
  • EPM is magnetized and demagnetized with a single current pulse.
  • the valve can sustain a maximum of 1010 kPa, while being activated and deactivated within 0.5 ms and 0.72 ms respectively. At the same time, it consumes negligible power in the steady state condition, with 15.3 mJ for activation and 6 mJ for deactivation.
  • the current work is an improvement compared to the state-of-the-art in terms of power consumption and maximum sustained pressure.
  • smaller valves exist, with much lower capabilities with regard to pressure.
  • our valve has the property that the sustained pressure can be tuned, which can provide flexibility to the applications that use it. This valve is of particular interest in several fields such as for example robotics applications or medical application such as medical applications for plantar pressure relief in diabetic patients.
  • the MRF valve can be used to control the stiffness of medical footwear.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

La présente invention concerne une soupape (10) comprenant un boîtier (11) ayant une structure périphérique (12) constituée d'un matériau conducteur de champ magnétique et un noyau (13) disposé dans ledit boîtier (11), le noyau (13) et la structure périphérique (12) délimitant une première chambre (14) disposée sur un côté du noyau (13), une seconde chambre (15) disposée sur un autre côté du noyau (13). La soupape (10) comprend en outre au moins un canal (16) formé entre la structure périphérique (12) et ledit noyau (13), ce canal (16) reliant ladite première chambre (14) à ladite seconde chambre (15). Le boîtier (11) contient un fluide magnétorhéologique (MRF). La soupape est caractérisée en ce que le noyau (13) comprend un aimant électro-permanent (EPM). L'invention concerne en outre un système de commande comprenant une soupape telle que définie ci-dessus, ledit système de commande comprenant un module de commande agencé pour transmettre à ladite bobine (17) une impulsion électrique ayant une direction choisie de manière à ouvrir ou fermer ladite soupape (10). L'invention concerne également un procédé de commande d'une soupape telle que définie ci-dessus. Ledit procédé comprenant les étapes consistant à choisir si la soupape (10) doit être ouverte ou fermée ; appliquer une impulsion électrique à la bobine (17) entourant le noyau (13) de l'EPM de sorte que le noyau permet le passage du MRF à travers le canal (16), de l'une desdites première ou seconde chambres (14, 15) à l'autre chambre dans le cas où la soupape doit être ouverte ; et appliquer une impulsion électrique à la bobine (17) entourant le noyau (13) de l'EPM de sorte que le noyau (13) empêche le passage du MRF à travers le canal (16), de l'une desdites première ou seconde chambres (14, 15) à l'autre chambre lorsque la soupape doit être fermée.
PCT/EP2023/084657 2022-12-09 2023-12-07 Soupape magnétorhéologique WO2024121286A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP22212573 2022-12-09
EP22212573.4 2022-12-09

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8302327B2 (en) * 2007-09-20 2012-11-06 Inventus Engineering Gmbh Valve for magnetorheologic fluids
US10598248B2 (en) * 2017-11-01 2020-03-24 Simon Fraser University Smart fluid damper

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8302327B2 (en) * 2007-09-20 2012-11-06 Inventus Engineering Gmbh Valve for magnetorheologic fluids
US10598248B2 (en) * 2017-11-01 2020-03-24 Simon Fraser University Smart fluid damper

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