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WO2008135352A1 - Système d'actionnement piézoélectrique - Google Patents

Système d'actionnement piézoélectrique Download PDF

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Publication number
WO2008135352A1
WO2008135352A1 PCT/EP2008/054542 EP2008054542W WO2008135352A1 WO 2008135352 A1 WO2008135352 A1 WO 2008135352A1 EP 2008054542 W EP2008054542 W EP 2008054542W WO 2008135352 A1 WO2008135352 A1 WO 2008135352A1
Authority
WO
WIPO (PCT)
Prior art keywords
piezoelectric
drive device
actuator
friction
piezoelectric drive
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.)
Ceased
Application number
PCT/EP2008/054542
Other languages
German (de)
English (en)
Inventor
Walter Haussecker
Jörg WALLASCHEK
Vincent Rieger
Jens Twiefel
Tobias Hemsel
Volker Rischmueller
Dirk Guenther
Peter Froehlich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2008135352A1 publication Critical patent/WO2008135352A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
    • H02N2/001—Driving devices, e.g. vibrators
    • H02N2/002—Driving devices, e.g. vibrators using only longitudinal or radial modes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
    • H02N2/005—Mechanical details, e.g. housings
    • H02N2/0055—Supports for driving or driven bodies; Means for pressing driving body against driven body
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
    • H02N2/026—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors by pressing one or more vibrators against the driven body
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
    • H02N2/103—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors by pressing one or more vibrators against the rotor

Definitions

  • the invention is based on a piezoelectric drive device and a method for operating such according to the preamble of the independent claims.
  • an ultrasonic motor in which a rotor shaft is rotated by means of ultrasonic vibrators in rotation.
  • two ultrasonic vibrators are connected to one another at right angles, with both vibrators being supplied with an alternating voltage in such a way that the two vibrators oscillate relative to one another with a phase difference.
  • This vibration generates a movement of a plunger that rotates the rotor shaft.
  • the piezoelectric actuators are mounted by means of a fastening element which connects the two piezoelectric actuators integrally with one another.
  • the piezoelectric drive device as well as the method for operating such a device having the features of the independent claims
  • the mechanical fixation of the piezo actuators in the bearing element, the electrical excitation of the Piezoele- mente adapted which is made possible in particular by the single-phase excitation of the piezoelectric actuators.
  • the piezoactuators in the excited state essentially execute a superimposed bending longitudinal vibration
  • the vibration node is designed as a substantially straight line which intersects the actuator housing in two opposite points. If the piezoactuator is stored approximately point-like in these intersections, the actuator oscillation is hardly attenuated by the bearing, which can significantly increase its efficiency.
  • the piezoelectric actuator can be advantageously fixed rigidly over its entire circumference along the circumferential line, whereby a very stable storage is achieved.
  • the extension in the transverse direction may be more punctiform or annular, wherein in the presence of a nodal plane, the extension can be received at arbitrary points along the circumference of the layer element.
  • the receptacle is formed as a groove, in particular as an annular groove, whose axial extent is ideally concentrated as possible on the nodal plane.
  • the support member can also be clamped on the smooth surface of the actuator housing and positioned by means of a fine adjustment.
  • the mounting plates can be arranged approximately parallel to the bridge web.
  • the mounting element in particular the mounting plates can also extend in the transverse direction away from the respective opposite piezoelectric actuator, so that there is sufficient space for the bracing of the bearing element, or for its attachment to the body or on the part to be adjusted.
  • the pressing force with which the piezomotor is pressed against the friction surface can be predefined very easily by an adjustment device of the position element, as a result of which the normal force can be adapted particularly favorably to the oscillation movement of the piezomotor.
  • the piezoelectric drive device according to the invention is driven at its resonance frequency, in particular with a single-phase excitation frequency, since then defined vibration nodes are formed in the piezoactuators in which the bearing element can then be fixed very precisely.
  • exactly two piezo actuators are arranged approximately parallel to one another, wherein the bridge web is arranged approximately parallel to the mounting plates, between which the receptacles are clamped.
  • the friction element can be placed on the bridge bridge either by one of the two piezo actuators or by a common excitation of the two piezo actuators in a shock or an ellipse movement. If the bridge web is arranged substantially perpendicular to the longitudinal direction of the piezoelectric actuator, the greatest amplification of the plunger movement is achieved.
  • the bridge bridge can be designed, on the one hand, as a free lever arm or, on the other hand, as a connecting web to a second piezoelectric actuator.
  • the longitudinal vibration of the piezoelectric actuator can be implemented particularly effectively in a thrust movement in the longitudinal direction.
  • the gain or the impact force to be transmitted can be adjusted, whereby an adaptation for different applications is possible.
  • the bridging web can be designed to be rather flexible or rather rigid.
  • the stiffness of the bridge web can be influenced by its choice of material and shape. To realize a flexible bridge bridge, one or more areas can be formed with corresponding recesses on this, for example, so that its material cross-section is reduced.
  • the single-phase excitation of the piezo motor Due to the single-phase excitation of the piezo motor only a single excitation signal must be generated, which is alternately given to one or the other piezoelectric actuator.
  • the vibration behavior of the piezoelectric motor is determined only by the one single excitation frequency, so that the movement path of the plunger is easily predetermined, and the bearing of the piezoelectric actuators can be tuned to this one excitation frequency. For external influences that detune the resonance frequency, the resonance frequency can be tracked much easier with a single-phase excitation.
  • the tangential movement component of the friction element is transmitted to the drive element. It is particularly favorable to fix the piezo motor to the movable part by means of the bearing element so that it moves away from the stationary part with respect to a stationary friction surface.
  • the storage element for a window lift drive in the motor vehicle can be fastened to a window pane.
  • the direct generation of a linear motion enables a very fast response time with high dynamics.
  • the Micro shock principle a very precise positioning of the part to be adjusted with low noise emission can be achieved.
  • FIG. 3 is a piezoelectric element for installation in the piezoelectric actuator according to FIG. 1
  • FIG. 4 is a schematic representation for operating the drive device
  • FIGS. 10 a, b show the exploded views of two piezo motors according to the invention.
  • a piezoelectric drive device 10 in which a piezomotor 12 performs a relative movement relative to a corresponding friction surface 14.
  • the friction surface 14 is in this case formed as a linear rail 16, which is fastened for example to a body part 17.
  • the piezomotor 12 has at least one piezoelectric actuator 18, which in turn contains a piezoelectric element 20.
  • the piezoelectric actuator 18 has an actuator housing 22 which accommodates the piezoelectric element 20.
  • the actuator housing 22 is formed, for example, sleeve-shaped. In the illustrated embodiments, the piezoelectric element 20 is enclosed by the actuator housing 22.
  • the piezoactuator 18 has a longitudinal direction 19 in the direction of which the expansions of the piezoactuator 18 are greater than in a transverse direction 24.
  • the piezoelectric element 20 is preferably biased in the actuator housing 22 in the longitudinal direction 19, such that upon excitation of a longitudinal vibration 26 of the piezoelectric element 20 in this no tensile forces occur. Due to the vibration of the piezoelectric element 20, the entire piezoelectric actuator 18 is set in longitudinal vibration 26 and transmits a vibration amplitude 45 via a bridging web 28 to a friction element 30 which is in frictional contact with the friction surface 14.
  • the bridging web 28 Due to the longitudinal vibration 26 of the piezoelectric actuator 18, the bridging web 28 is set into a tilting movement or a bending movement, so that an end 31 of the friction element 30 facing the friction surface 14 performs a micro-pushing movement.
  • the interaction between the friction element 30 and the friction surface 14 is shown in the enlarged detail, in FIG it can be seen that the bridging web 28, which is arranged in the rest position approximately parallel to the friction surface 14, tilted at the excited vibration of the piezoelectric actuator 18 relative to the friction surface 14.
  • the end 31 of the friction element 30 performs, for example, approximately an elliptical movement 32 or circular movement, by means of which the piezomotor 12 abuts along the linear rail 16.
  • the piezomotor 12 is mounted in the region of a vibration node 34 of the piezoelectric actuators 18 and, for example, connected to a part 11 to be moved.
  • the vibration node 34 is formed in the longitudinal vibration 26 of the piezoelectric actuator 18 as a node plane 111, which extends approximately perpendicular to the longitudinal direction 19.
  • the piezoactuator 18 is received by a bearing element 36 on an outer peripheral line 112, which is formed by the section of the account plane 111 through the piezoelectric actuator 18.
  • the vibration node 34 is determined for this purpose by means of simulation and / or empirically.
  • the piezomotor 12 is pressed against the friction surface 14 via a bearing element 36 with a normal force 37.
  • the end 31 of the friction element 30 now executes an elliptical movement 32 which, in addition to the normal force 37, has a tangential force component 38 which effects the advancement of the piezo motor 12 relative to the friction surface 14.
  • the friction element 30 performs only a linear pushing movement at a certain angle to the normal force 37. This also leads to a relative movement by means of microbumps.
  • the piezomotor 12 has exactly two piezoactuators 18, which are both arranged approximately parallel to their longitudinal direction 19.
  • the bridge web 28 is arranged transversely to the longitudinal direction 19 and connects the two piezoelectric actuators 18 at their end faces 27.
  • the bridge web can also be made of one piece with the actuator housings 22.
  • the bridge web 28 is formed for example as a flat plate 29, in the middle of the friction element 30 is arranged. In a preferred mode of operation of the piezoelectric drive device 10, only one of the two piezoactuators 18 is excited for a relative movement in a first direction 13.
  • the second, non-excited piezoactuator 18 acts via the bridging web 28 as an oscillating mass, due to which the bridging web 28 is tilted or bent with the friction element 30 with respect to the longitudinal direction 19.
  • the longitudinal vibration 26 of the piezoelectric element 20 is thus converted into a micro-impact movement with a tangential force component 38.
  • the electrical excitation of the piezoelectric element 20 takes place via electrodes 40, which are connected via a contacting element 41 to an electronic unit 42 are.
  • the piezoelectric element 20 of the other piezoelectric actuator 18 is excited accordingly by means of the electronic unit 42. In this mode of operation, only one piezoelectric element 20 of the piezoelectric motor 12 is always excited so that no superposition of two oscillatory excitations of both piezoelectric actuators 18 can occur.
  • the piezoelectric drive device is operated at its resonance frequency 44.
  • the electronic unit 42 has a tuning circuit 46, which controls the corresponding piezoelectric element 20 in such a way that the entire system oscillates in resonance.
  • the electronic unit 42 may be arranged, for example, at least partially within the actuator housing 18 or the bearing 36.
  • the amplitudes 45 of the resonance frequency 44 of the longitudinal vibration 26 are shown in the two piezoelectric actuators 18, wherein the two piezoelectric actuators 18 are not excited simultaneously in this mode of operation.
  • the maximum amplitudes 45 correspond here to the mechanical resonance frequency 44.
  • FIG. 2 shows a variation of the drive device 10, in which the piezomotor 12 is mounted in a body part 17.
  • the friction surface 14 is designed as a circumferential surface of a rotation body 48, so that the rotary body 48 is set in rotation by the slide movement of the friction element 30.
  • the direction of rotation 49 of the rotary body 48 can in turn be predetermined by the activation of only one piezoelectric element 20 on one of the two piezoactuators 18.
  • Such a drive device 10 generates a rotation as a drive movement and can thus be used in place of an electric motor with a downstream transmission.
  • the piezoactuators 18 perform, for example, a superimposed bending longitudinal oscillation.
  • the vibration node 34 is formed as a node line 113 (projecting into the plane), which results in section with the actuator housing 22 respectively two opposite intersections 114, in which the piezoelectric actuator 18 is mounted by means of a receptacle 107 approximately punctiform means of the bearing element 36.
  • a piezoelectric element 20 is shown enlarged, as it can be used for example in the piezoelectric motor 12 of FIG. 1 or 2.
  • the piezoelectric element 20 has a plurality of separate layers 50, between which the respective electrodes 40 are arranged. If a voltage is applied to the electrodes 40 via the electronic unit 42 43 applied, the piezoelectric element 20 expands in the longitudinal direction 19. The extent of the individual layers 50 adds up, so that the total mechanical amplitude 45 of the piezoelectric element 20 in the longitudinal direction 19 can be predetermined by the number of layers 50.
  • the layers 20 are arranged transversely to the longitudinal direction 19 in the actuator housing 22, so that the entire piezoelectric actuator 18 is offset by the piezoelectric element 20 in longitudinal vibration 26.
  • the piezoelectric element 20 is preferably produced from a ceramic 21 of high quality, so that in resonance mode of the piezoelectric element 20 very large amplitudes 45 can be generated.
  • FIG. 4 shows a model of the piezoelectric drive device 10 which serves as the basis for adjusting the resonance frequency 44.
  • the piezoelectric actuator 18 is shown as a resonant circuit 52, in which an inductance 53 with a first capacitor 54 and a resistive load 55 are connected in series.
  • a second capacitance 56 is connected in parallel.
  • an excitation voltage 43 is applied by means of the electronic unit 42.
  • the resonance frequency 44 of the entire drive device 10 depends on the load 58, which is determined, for example, by the weight of the part 11 to be adjusted and / or the friction condition between the friction element 30 and the friction surface 14.
  • the adjusting device 10 when the adjusting device 10 is excited by means of the electronic unit 42, a frequency response occurs, as shown in FIG. 5.
  • the power 59 is plotted against the frequency 69.
  • the maximum 63 of the active power 64 occurs at the resonance frequency 44, to which the piezoelectric drive device 10 is controlled by means of the tuning circuit 46.
  • the resonance frequency 44 is for example in the range between 30 and 80 kHz, preferably between 30 and 50 kHz.
  • FIG. 6 shows the associated impedance behavior of the piezomotor 12 via the frequency response.
  • the phase characteristic 60 of the impedance of the adjusting device 10 represented by the oscillating circuit 52 according to FIG. 4 has a first zero-crossing 65 with positive gradient and a second zero-crossing 66 with negative gradient corresponding to the series resonance and the parallel resonance of the oscillating circuit 52 ,
  • the phase angle 68 is shown on the Y-axis on the right side of the diagram.
  • the frequency 69 for example, on the zero-crossing 65 with positive slope, which is electronically relatively easily by means of a phase locked loop 47 (PLL Phase Locked Loop) feasible.
  • the left Y-axis 74 represents the magnitude 70 of the impedance, wherein the impedance curve 70 over the frequency 69 has a minimum 71 at the first zero-crossing 65 and a maximum 72 at the second zero-crossing 66.
  • FIG. 7 schematically shows the longitudinal oscillation 26, as it is excited, for example, in the piezoactuators 18 according to FIG.
  • the amplitude 45 of the longitudinal vibration 26, which corresponds to the amplitude 45 in FIG. 1, is shown in the upper half of the figure.
  • the amplitude 45 is equal to zero, wherein the length extension of the piezoactuator 18 starting from the oscillation node 34 may have different amounts a, b.
  • the amounts a and b and their relationship to each other can be determined in particular by the arrangement of the piezoelectric element 20 in the piezoelectric actuator 18. In the middle part of the picture, the maximum length extension of the piezoelectric actuator 18 is more free
  • the piezoelectric actuator 18 is shown without electrical excitation or in the case of a bipolar material with a negative excitation voltage and therefore with minimal deflection in the longitudinal direction 19.
  • the fiction element 30 is arranged, for example, on the right end side 27 of the piezoelectric actuator 18, so that this undergoes a maximum stroke 115 on the central axis 89 of the piezoelectric actuator of.
  • Vibration node 34 is formed in this longitudinal vibration 26 as a nodal plane 111 which extends transversely to the longitudinal direction 19.
  • a vibration node 34 on the surface of the actuator housing 22 results in the circumferential line 112 at which the piezoactuator 18 is rigidly connected to the bearing element 36, as shown in detail in FIG. 9, for example.
  • FIG 8 shows schematically a superimposed bending longitudinal vibration, in which the piezoelectric actuator 18 in addition to the vibration in the longitudinal direction 19 performs an oscillation in the transverse direction 24.
  • the piezoelectric actuator 18 for example, the piezoelectric element 20 is arranged in four regions, which are excited in such a way that a longitudinal bending vibration sets.
  • the vibration node 34 represents a node line 113, which in this example is perpendicular to the plane of the drawing.
  • the two opposite intersection points 114 result, in which the piezoelectric actuator 18 is received in an approximately point-like manner rigidly in the bearing element 36.
  • the friction element 30, for example, arranged directly on the end face 27 of the piezoelectric actuator 18 and performs an elliptical motion 32 or circular motion due to the longitudinal bending vibration.
  • FIG. 9 shows a further exemplary embodiment, in which an extension 116 in the transverse direction 24 is arranged on the piezoelectric actuator 18.
  • This extension 116 is arranged, for example, on the circumferential line 112 of the nodal plane 111 with the actuator housing 22.
  • the extension 116 is embodied here as a separately manufactured holding element 117, which can be adjusted very precisely by means of a fine adjustment 118 on the actuator housing 22.
  • the separate support member 117 can be adjusted very precisely to the node level 111, wherein the support member 117 is in turn mounted firmly in the bearing element 36.
  • the support member 117 is formed, for example, as a shaft securing ring.
  • the bearing element 36 has two mounting plates 119, between which the extension 116 is clamped.
  • the mounting plates 119 are in this case arranged approximately parallel to the bridge web 28. In this case, the two mounting plates 119 are clamped together by means of connecting elements 120, for example screws 121 in the longitudinal direction 19.
  • the two piezo actuators 18 are clamped between similar mounting plates 119, which in turn are pressed by the support member 36 with a normal force 37 against the rubbing surface 14.
  • the normal force 37 with which the entire piezomotor 12 is pressed against the friction surface 14, can be variably adjusted.
  • the bearing element 36 has a device 122 for adjusting the contact pressure, which is designed, for example, as an adjusting screw 123, which is supported for example on a body part 17.
  • the extension 116 is not formed as a separate support member 117, but integrally with the actuator housing 22nd
  • FIGS. 10 a and 10 b each show a piezo motor 12 in an exploded view, with two piezo actuators 18 being connected to one another by means of the bridge web 28.
  • the piezo actuators 18 have a greater extent in the longitudinal direction 19 than in the transverse direction 24 and are arranged substantially parallel to one another.
  • the bridge element 28 is arranged approximately perpendicular to the longitudinal direction 19 and extends approximately parallel to the corresponding friction surface 14, as shown in Fig. 1.
  • the bridging web 28 and the friction element 30 are each designed as a separate component, which is then assembled together with the actuator housing 22.
  • the bridge web 28 recesses 4, in the Clamping element 95 for generating a bias voltage for the piezoelectric element 20 can be inserted.
  • the piezoelectric element 20 consists of a stacked ceramic 103, in which a plurality of ceramic rings 105 are stacked in the longitudinal direction 19 and clamped by means of the clamping element 95 against each other.
  • the clamping element 95 is formed, for example, as a screw 96, which can be screwed or inserted into the recess 4 on the one hand, and on the other hand can be screwed into the actuator housing 22.
  • the actuator housing 22 is designed, for example, as a cylindrical housing sleeve 25, which in FIG.
  • the piezoelement 20 is designed as a multilayer ceramic 104 which has a smaller outer diameter as the actuator housing 22.
  • the piezoelectric element 20 is in this case completely accommodated in the cavity 23 of the actuator housing 22.
  • the piezoelectric element 20 is electrically insulated from the actuator housing 22 by means of an insulating element 106.
  • the actuator housing 22 has, for example, an internal thread into which the helical clamping elements 95 are screwed.
  • the bridge element 28 has a further recess 5 into which the friction element 30 is inserted.
  • the friction element 30 is designed as a plunger 94 which has a greater extent in the longitudinal direction 19 than in the transverse direction 24.
  • the plunger 94 has an abutment surface 101 which extends substantially parallel to the bridging web 28 and parallel to the corresponding friction surface 14.
  • the friction element 30 is arranged approximately in the middle between the two piezoactuators 18 and has a distance 2 from the central axis 89 of the piezoelectric actuators 18.
  • a receptacle 107 is formed on the actuator housing 22 in FIG. 10 a, which is formed as an extension 116 in the transverse direction 24.
  • the receptacle 107 is arranged in the region of the vibration node 34 of the piezoelectric actuator 18 and extends over the entire circumference along the circumferential line 112.
  • the receptacle 107 for the bearing element 36 is formed as a groove 108, in which the bearing element 36 is engageable
  • the groove 108 extends here as an annular groove over the entire circumferential line 112, in which the bearing element 36 engages directly.
  • this may also have a quadrangular cross section, as shown for example in FIGS. 1 and 2.
  • the receptacle 107 may also be arranged only at certain points 114, or at partial areas of the circumference or on certain outer surfaces.
  • the specific design of the piezoelectric actuators 18 whose actuator housing 22, the piezoelectric elements 20 (monoblock, stacking or multilayer), the bridge web 28 and the friction element 30 can be varied according to the application.
  • the plunger movement may be formed as a pure shock movement or as a substantially elliptical or circular trajectory, wherein according to the transverse component of the power transmission, the friction pair between the friction member 30 and the friction surface 14 has a higher or lower coefficient of friction.
  • the pure linear plunger movement is the limiting case of the ellipse movement.
  • a training with pure form-fitting is possible in which the friction element 30 without friction in a corresponding recess, for example in a micro-toothing of the drive element, for example, the linear guide rail 16 or the rotating body 48 attacks.
  • the corresponding oscillations of a plurality of piezoelectric actuators 18 of a piezoelectric motor 12 can be excited simultaneously in one or more phases, whereby a superimposition of these oscillations causes a plunger movement which causes the drive element to move.
  • all piezoelectric actuators can be accommodated in a common bearing element 36, or in each case only individual piezoelectric actuators 18 are rigidly fastened.
  • the specific embodiment of the receptacles 107 is dependent on the shape of the actuator housing 22 and the excited waveform.
  • the drive unit 10 according to the invention is used for adjusting moving parts 11 (seat parts, windows, roof, flaps) in the motor vehicle, but is not limited to such an application.

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  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Abstract

La présente invention concerne un système d'actionnement piézoélectrique (10) et le procédé de mise en oevre correspondant, pour le déplacement de pièce mobiles (11) équipant notamment des véhicules automobiles. On utilise à cet effet un piézomoteur (12) comportant au moins un actionneur piézoélectrique (18) pourvu d'au moins un élément piézoélectrique (20). Le piézomoteur (12) commande au moins un élément à friction (30) au moyen duquel on produit un mouvement relatif par rapport à une surface de frottement (14) faisant face à l'élément à friction (30). En l'occurrence, l'actionneur piézoélectrique considéré (18) est monté sur un élément palier (36) se trouvant dans la zone d'un noed de vibration (34), au point d'amplitude nulle de l'oscillation de l'actionneur piézoélectrique provoquée par l'excitation.
PCT/EP2008/054542 2007-05-07 2008-04-15 Système d'actionnement piézoélectrique Ceased WO2008135352A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007021336.2 2007-05-07
DE102007021336A DE102007021336A1 (de) 2007-05-07 2007-05-07 Piezoelektrische Antriebsvorrichtung

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WO2008135352A1 true WO2008135352A1 (fr) 2008-11-13

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0231940A2 (fr) * 1986-02-04 1987-08-12 Siemens Aktiengesellschaft Actionneur piézo-électrique
JP2005137100A (ja) * 2003-10-29 2005-05-26 Seiko Instruments Inc 超音波モータ及び超音波モータ付電子機器
JP2005143176A (ja) * 2003-11-05 2005-06-02 Olympus Corp 回転駆動装置
US20050258711A1 (en) * 2004-05-20 2005-11-24 Olympus Corporation Ultrasonic vibrator and ultrasonic motor including ultrasonic vibrator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000152671A (ja) 1998-11-05 2000-05-30 Japan Science & Technology Corp 超音波モータ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0231940A2 (fr) * 1986-02-04 1987-08-12 Siemens Aktiengesellschaft Actionneur piézo-électrique
JP2005137100A (ja) * 2003-10-29 2005-05-26 Seiko Instruments Inc 超音波モータ及び超音波モータ付電子機器
JP2005143176A (ja) * 2003-11-05 2005-06-02 Olympus Corp 回転駆動装置
US20050258711A1 (en) * 2004-05-20 2005-11-24 Olympus Corporation Ultrasonic vibrator and ultrasonic motor including ultrasonic vibrator

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
HEMSEL ET AL: "Piezoelectric linear motor concepts based on coupling of longitudinal vibrations", ULTRASONICS, IPC SCIENCE AND TECHNOLOGY PRESS LTD. GUILDFORD, GB, vol. 44, 28 December 2006 (2006-12-28), pages e591 - e596, XP005819657, ISSN: 0041-624X *
HEMSEL T ET AL: "Survey of the present state of the art of piezoelectric linear motors", ULTRASONICS, IPC SCIENCE AND TECHNOLOGY PRESS LTD. GUILDFORD, GB, vol. 38, no. 1-8, 1 March 2000 (2000-03-01), pages 37 - 40, XP004197822, ISSN: 0041-624X *

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