EP0217694B1 - Procédé et dispositif d'alimentation électrique d'un transducteur générateur de vibrations tant sonores qu'ultrasonores - Google Patents

Procédé et dispositif d'alimentation électrique d'un transducteur générateur de vibrations tant sonores qu'ultrasonores Download PDF

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Publication number
EP0217694B1
EP0217694B1 EP86401833A EP86401833A EP0217694B1 EP 0217694 B1 EP0217694 B1 EP 0217694B1 EP 86401833 A EP86401833 A EP 86401833A EP 86401833 A EP86401833 A EP 86401833A EP 0217694 B1 EP0217694 B1 EP 0217694B1
Authority
EP
European Patent Office
Prior art keywords
frequency
phase shift
transducer
adapter
control
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.)
Expired - Lifetime
Application number
EP86401833A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0217694A1 (fr
Inventor
Bernard Thirion
Pierre Poupaert
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.)
INSTITUT SUPERIEUR D'ELECTRONIQUE DU NORD ISEN
Original Assignee
INSTITUT SUPERIEUR D'ELECTRONIQUE DU NORD ISEN
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Priority to AT86401833T priority Critical patent/ATE62835T1/de
Publication of EP0217694A1 publication Critical patent/EP0217694A1/fr
Application granted granted Critical
Publication of EP0217694B1 publication Critical patent/EP0217694B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0238—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave
    • B06B1/0246—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal
    • B06B1/0253—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal taken directly from the generator circuit

Definitions

  • the invention relates to a method (see preamble of claim 1) and to a device (see preamble of claim 7) for supplying power to a transducer generating both sound and ultrasonic vibrations.
  • the transducer behaves in a certain way and for example as a pure resistive load, inducing no phase difference between voltage and current, and not as a more inductive or capacitive load
  • the frequency of the supply must be determined with reference to the resonant frequency of the acoustic line constituting the load of the transducer such as a tool and more precisely with reference to one of the two resonant frequencies which are present, a series resonant frequency and a parallel resonant frequency called anti-resonance.
  • the characteristic is exploited that, at said resonant frequencies, the phase shift between the voltage and the current of the power supply is zero.
  • the frequency of this power supply is gradually modified to sweep a certain frequency range until it stops on that where there is cancellation of the phase shift.
  • the corresponding frequency is then retained as the reference frequency of the corresponding acoustic line when it is used under research conditions.
  • an oscillator controlled by a voltage which delivers a signal whose frequency is a function of the control voltage applied to it and which comes from a control member, either manual, more generally automatic such as a microcomputer.
  • This microcomputer then receives either, from a continuous sampling device, signals representative of the current and the voltage, or, from a phase comparator, a signal representative of the phase shift between the aforementioned signals and this information received by the microcomputer are converted from their initial analog form into a digital form acceptable by said microcomputer, just as its output instructions are then from their initial digital form converted into an analog form compatible with the controlled oscillator.
  • This analog signal is therefore produced by the phase comparator.
  • the known supply devices are not at all suitable when their transducer has to work, on the one hand, at high power, hence unequal variations in speed and importance of the resonant frequency, but also, on the other hand, in a lasting, if not continuous, manner from which results in particular heating and wear of the sonotrode also inducing significant variations in the frequency of resonance.
  • a result which the invention aims to obtain is a method and a device for supplying power to a transducer with which the agreement on the working frequency follows the very rapid and significant modifications of this frequency.
  • a method and an intelligent device which, while following the very rapid and significant modifications of the resonant frequency, makes it possible to disregard it within a certain limit fixed beforehand.
  • Another result which the invention aims to obtain is such a method and such a device with which the agreement is sufficiently precise to be made both with reference to the series resonant frequency and to the parallel resonant frequency where the power under load is stronger than at rest and where, therefore, the maximum power is provided at the time useful for work where optimal performance and although at this frequency, the current is very low and difficult to measure.
  • a method and such a device which allow uses requiring different frequencies and powers and for example both for tasks requiring a large power such as machining and assistance electroerosion, electrochemical polishing, extrusion, than for conventional stains such as welding and washing.
  • control member is maintained in the said control and command loop and, by means of the interpretation device, which is a processor and, depending on the information supplied to it processor and in particular information coming from the means of analysis and supply of the phase shift and of the direction of the phase shift between the current and the voltage of the power supply of the transducer, control signals of the adapter are each produced determining an output frequency and by which, taking into account only the possible existence of a phase shift requesting correction, whatever the value and that of the direction of this phase shift, the progressive modification of the frequency in the direction required by the phase shift direction until one of the two situations occurs, which is either the disappearance of the phase difference requiring correction, or the arrival at the limit previously fixed for the modification of the frequencies from the starting frequency of this modification.
  • These means 3 are connected by lines 4, 5 to means 6 to 8 which analyze them and provide information on the voltage and the current of the supply of the transducer 2 and in particular on their phase shift D f and on the direction S f of this phase shift.
  • the main circuit 1 has its end opposite to that connected to the transducer 2 which is connected to the output of an adapter 14 ensuring the electrical supply of said transducer 2.
  • This adapter has a main input 15 and a control input 155.
  • the main input 15 of the adapter 14 is connected to the sector 16 by a suitable member 17 such as a rectifier and possibly an autotransformer.
  • a circuit breaker 22 can be interposed between this member 17 and the adapter 14 and, optionally, a suppressor 23 such as an integrator circuit.
  • the adapter 14 For the step of finding the tuning frequency of an acoustic line, the adapter 14 has its control input which, by a line 13, is connected to a control member 11 comprising a processor and which sends signals 12 each determining a different value of the frequency at the output of the adapter 14, which makes it possible to control a frequency sweep until the phase shift is canceled.
  • the transducer 2 may lose its ability to resonate in the frequency search range, and in this situation, the device may not make it possible to find the frequency of agreement in spite of a sweep during which, for example, the phase shift has varied between minus ninety degrees and minus twenty degrees or seventy degrees but therefore without going through zero degree, that is to say by the frequency of agreement.
  • a fictitious phase shift C f for example of thirty degrees, is created between U and I, and, at low power, a second scan is carried out which, taking the example above and due to the fictitious phase shift, will lead to a phase shift of minus sixty to plus ten degrees which will therefore go through zero degrees, that is to say by the tuning frequency.
  • the power is increased so that the device maintains the agreement and then the fictitious phase shift is removed, which shows a real phase shift, of opposite direction and same value but that, in the manner described below, the device detects which allows it to immediately control a catch-up.
  • the device In order to operate the adapter 14 at a working frequency determined with reference to the previously desired tuning frequency and the evolution of working conditions, the device is controlled.
  • the adapter 14 has its control input which receives signals 12 and which, for this purpose, by a circuit 9, 10 is connected to the analysis means 6, 7 and 8 for, in particular, with the adapter, the main circuit 1, the lines 4, 5 and the analysis means 6 to 8 form a command and control loop for the adapter 14.
  • the control member 11 is maintained in said control and command loop and, by means of its processor and, as a function of the information supplied to this processor and in particular of information from means 6 to 8 for analyzing and supplying the phase shift D f and the direction S f of the phase shift between the current I and the voltage U of the power supply of the transducer 2, signals 12 for controlling the adapter are produced each determining an output frequency and by which, taking into account only the possible existence of a phase shift requesting correction, whatever the value and only in the direction of this phase shift, the progressive modification of the frequency is controlled in the direction required by the direction of the phase shift until one of the two situations occurs, either the disappearance of the phase difference requiring correction, or the arrival at limit previously fixed to the modification of the frequencies since the starting frequency of this modification.
  • the modifications to the position of the working frequency chosen so as to take account of changes in working conditions during the servo-control of the device naturally have limits by detecting the crossing which we detect abnormal operation such as a machining incident, tool break ...
  • the frequency modification is interrupted at at least one of these normal operating limits and, optionally, after at least one new attempt, issues a fault signal such as a visual or audible alarm and / or an installation shutdown command.
  • a fault signal such as a visual or audible alarm and / or an installation shutdown command.
  • the position and the extent of the frequency modification, the phase shift tolerance and the limits of normal operation are determined by a low power analysis of the overall behavior of the load and as a function of the frequency at which it is desired. to work.
  • the device is preferably adjusted so that the working frequency of the transducer corresponds to the parallel resonant frequency, but as is apparent from the above, the device can also operate at the frequency of resonance or any other frequency.
  • the processor card 11 offers a choice of programs adapted to each task and other advantages such as adjustment and control of the power supplied to the transducer.
  • the servo means of the power supply device comprise a circuit 3 to 14 including said processor control member 11, the output of which, during servo-control, remains connected to the control input of the adapter 14 and provides it with signals 12 each determining a output frequency.
  • the analysis means 6 to 8 comprise a filter 6 responsible for finding the fundamental signal before addressing it by a circuit 7 by means 8 consisting of a shaping means 8 which analyzes it to extract it.
  • the two aforementioned pieces of information which are one the phase shift D f and the other the direction of phase shift S f between U and I.
  • control member 11 may include a synthesizer.
  • the adapter 14 preferably consists of at least one power inverter 19 of which, by a card 20, the switches are controlled sequentially as a function of the synthesis of the signals 12 received at its input, which signals are preferably digital in nature.
  • the device also comprises means, which can be integrated into processor control devices ensuring power regulation 21 by acting either on the member 17 by which the device is connected to the sector 16 if it includes a controlled rectifier or a variable autotransformer, i.e. on inverter 19.
  • the circuit breaker 22 can be controlled from several points and for example from a frame controller (voltmeter, ammeter), a setpoint, the processor card of the member 11 or the fault signal.
  • a frame controller voltage, ammeter
  • a setpoint the processor card of the member 11 or the fault signal.
  • the inverters preferably have a limiter 24 ensuring them faster personal protection.
  • the entire device is monitored and controlled by the processor card which supplies the main frequency 12, the command 21 for adjusting the power and tripping 25, the display 26 of the tasks performed and of the causes of stoppage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Electrophonic Musical Instruments (AREA)
EP86401833A 1985-08-27 1986-08-19 Procédé et dispositif d'alimentation électrique d'un transducteur générateur de vibrations tant sonores qu'ultrasonores Expired - Lifetime EP0217694B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86401833T ATE62835T1 (de) 1985-08-27 1986-08-19 Verfahren und anordnung zur elektrischen speisung von schall- und ultraschallwandlern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8513032A FR2586883B1 (fr) 1985-08-27 1985-08-27 Procede et dispositif d'alimentation electrique d'un transducteur generateur de vibrations tant sonores qu'ultrasonores.
FR8513032 1985-08-27

Publications (2)

Publication Number Publication Date
EP0217694A1 EP0217694A1 (fr) 1987-04-08
EP0217694B1 true EP0217694B1 (fr) 1991-04-24

Family

ID=9322558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401833A Expired - Lifetime EP0217694B1 (fr) 1985-08-27 1986-08-19 Procédé et dispositif d'alimentation électrique d'un transducteur générateur de vibrations tant sonores qu'ultrasonores

Country Status (9)

Country Link
US (1) US4748365A (ja)
EP (1) EP0217694B1 (ja)
JP (1) JPS62110784A (ja)
AT (1) ATE62835T1 (ja)
AU (1) AU6184386A (ja)
CA (1) CA1267720A (ja)
DE (1) DE3678890D1 (ja)
FR (1) FR2586883B1 (ja)
IL (1) IL79840A (ja)

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* Cited by examiner, † Cited by third party
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CH672894A5 (ja) * 1987-09-14 1990-01-15 Undatim Ultrasonics
JP2637467B2 (ja) * 1988-05-06 1997-08-06 キヤノン株式会社 振動型アクチュエーター装置
JPH0710189B2 (ja) * 1988-05-30 1995-02-01 キヤノン株式会社 振動波モーターの駆動回路
US4868445A (en) * 1988-06-20 1989-09-19 Wand Saul N Self tuned ultrasonic generator system having wide frequency range and high efficiency
US5146143A (en) * 1988-07-26 1992-09-08 Canon Kabushiki Kaisha Vibration wave driven motor
DE3925459A1 (de) * 1989-08-01 1991-02-14 Ferton Holding Ultraschallerzeuger mit einem piezoelektrischen wandler
US5113116A (en) * 1989-10-05 1992-05-12 Firma J. Eberspacher Circuit arrangement for accurately and effectively driving an ultrasonic transducer
JPH03161083A (ja) * 1989-11-17 1991-07-11 Aisin Seiki Co Ltd 圧電振動子の駆動装置および該駆動装置を使用した水滴除去装置
US5276376A (en) * 1992-06-09 1994-01-04 Ultrasonic Power Corporation Variable frequency ultrasonic generator with constant power output
DE4400210A1 (de) * 1994-01-05 1995-08-10 Branson Ultraschall Verfahren und Einrichtung zum Betrieb eines Generators zur HF-Energieversorgung eines Ultraschallwandlers
US5568003A (en) * 1994-09-28 1996-10-22 Zygo Corporation Method and apparatus for producing repeatable motion from biased piezoelectric transducers
FR2740572B1 (fr) * 1995-10-27 1997-12-26 Lorraine Laminage Procede et dispositif de pilotage d'actionneurs a ultra-sons de puissance
EP0839585A3 (en) * 1996-10-31 2000-12-27 Eastman Kodak Company Method and apparatus for testing transducer horn assembly debubbling devices
US5897569A (en) * 1997-04-16 1999-04-27 Ethicon Endo-Surgery, Inc. Ultrasonic generator with supervisory control circuitry
JP3347654B2 (ja) * 1997-10-29 2002-11-20 キヤノン株式会社 駆動装置
US6290778B1 (en) 1998-08-12 2001-09-18 Hudson Technologies, Inc. Method and apparatus for sonic cleaning of heat exchangers
US7004128B2 (en) * 2001-06-15 2006-02-28 Denso Corporation Control apparatus for device having dead band, and variable valve system
US7667851B2 (en) 2001-07-24 2010-02-23 Lockheed Martin Corporation Method and apparatus for using a two-wave mixing ultrasonic detection in rapid scanning applications
GB0129139D0 (en) * 2001-12-05 2002-01-23 Sra Dev Ltd Ultrasonic generator system
CN101181705B (zh) * 2006-11-14 2011-12-28 合世生医科技股份有限公司 压电致能产生系统及其产生方法
US20080116767A1 (en) * 2006-11-16 2008-05-22 Shan-Yi Yu Piezoelectric generation system and generation method thereof
BR102017011736B1 (pt) * 2017-06-02 2022-09-27 Electrolux Do Brasil S.A. Dispositivo ultrassônico removedor de manchas em tecidos

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US4371816A (en) * 1975-12-30 1983-02-01 Alfred Wieser Control circuit for an ultrasonic dental scaler
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JPS5610792A (en) * 1979-07-06 1981-02-03 Taga Denki Kk Method and circuit for driving ultrasonic-wave converter
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JPS5916572A (ja) * 1982-07-21 1984-01-27 多賀電気株式会社 超音波変換器駆動装置の駆動周波数制御方法
US4445063A (en) * 1982-07-26 1984-04-24 Solid State Systems, Corporation Energizing circuit for ultrasonic transducer
FR2536311B1 (fr) * 1982-11-24 1986-10-24 Satelec Soc Dispositif d'alimentation electrique d'un transducteur generateur de vibrations ultrasonores
JPH0630734B2 (ja) * 1983-08-05 1994-04-27 多賀電気株式会社 超音波変換器駆動制御方法
DE3331896A1 (de) * 1983-09-03 1985-03-21 Gerhard Prof. Dr.-Ing. 8012 Ottobrunn Flachenecker Leistungsgenerator fuer einen ultraschallwandler
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JP4758669B2 (ja) * 2004-03-29 2011-08-31 株式会社日本触媒 不定形破砕状の粒子状吸水剤
JP5078131B2 (ja) * 2007-03-27 2012-11-21 旭化成ケミカルズ株式会社 超高速吸収能力をもつ吸収性複合体
JP5417133B2 (ja) * 2009-06-17 2014-02-12 花王株式会社 吸収性物品
JP5592185B2 (ja) * 2010-07-21 2014-09-17 株式会社リブドゥコーポレーション 吸収性物品

Also Published As

Publication number Publication date
IL79840A (en) 1992-08-18
EP0217694A1 (fr) 1987-04-08
CA1267720A (fr) 1990-04-10
FR2586883A1 (fr) 1987-03-06
US4748365A (en) 1988-05-31
FR2586883B1 (fr) 1994-04-01
DE3678890D1 (de) 1991-05-29
ATE62835T1 (de) 1991-05-15
IL79840A0 (en) 1986-11-30
AU6184386A (en) 1987-03-05
JPS62110784A (ja) 1987-05-21

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