Piezomechanik

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Table of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Electro-Mechanical relations of piezoelectric actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Practical aspects of dynamically operated piezoactuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Selection guide for amplifiers/supply electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Special features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Useful formulas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Data of amplifiers SQV analog amplifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Low voltage analog power amplifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 High voltage power amplifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Bimorph amplifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 D/A Converters, Computer-Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 2 Amplifiers, D/A Converters, Electronic HV-Switches for Piezoactuators http://www.piezomechanik.com
Amplifiers, D/A Converters, Electronic HV-Switches for piezoactuators 1. Introduction Piezoelectrical actuators are innovative driving systems, which show increasing application potential for highly sophisticated driving/positioning tasks in a great variety of technological fields. The main areas of interest include • the extreme positioning sensitivity, enabling such systems to handle dimensions in the atomic scale • extreme force generation resulting for example in high acceleration rates during dynamic operation. For some applications no practicable alternative to piezoactuators exist • Piezoelectric actuators are used for the ultraprecise positioning of components and mechanical setups ranging from low weight optical elements, up to heavy loads such as tooling machines. The newest scanning microscope General considerations for electronic supplies for piezoactuators: In the simplest case a piezoactuator should move according to an external signal i.e. from a sinewave generator, or other source. In most cases, this original signal cannot be applied directly to the piezoactuator because voltage and power usually do not match the actuator’s requirements. An amplifier has to be used to convert the signal to result in sufficient travel and dynamics of the actuator. This is an important aspect of actuator’s application: The adaptation of a piezoelement to a distinct task is determined only in part by its mechanical properties and geometrical size. Equally important for the system’s performance are the properties of the driving electronics. The same actuator can be used for completely different operating profiles depending only on the choice of the supply electronics: signal generator elec. signal function generator feedback control electronic computer amplifier pulser Fig. 1: Schematic representation of an actuator system When designing a piezoactuated system the designer has to deal simultaneously with actuator and supply to get the optimum matching. A step-by-step definition whereby the actuator is first-chosen and then a sub- matching electronics technologies such as STMs, AFMs etc. require precise handling of probe tips with sub-nanometer precision, which can only done in a reasonable way by using piezomechanical elements. • The high acceleration rates/short reaction times predestinate piezoelements for the control of fast processes in valve technology, fuel injection application, mechanical shaking excitation for test purposes with time periods/risetimes in the microseconds range. • Piezoactuators are very attractive candidates for active vibration control and cancellation even in heavy and extended mechanical structures such as vehicles, airplanes, helicopters, ships. A special feature is the dual effect of piezoelectricity, which can be used both for sensing and actuating. Single element can therefore be used as smart transducers acting simultaneously as sensor and actuator. Slow cycling of an actuator requires only a small low power supply, whereas pulsed operation i.e. generating mechanical shocks, needs supplies with peakpowers in the kilowatt range. Computer control of actuators comprises an additional step: the computer data has to be converted by a D/A converter of sufficient speed and resolution, and the low voltage signal is than amplified to the actuator’s requirements. piezo actuator mechan. reaction sequent selection of the supply may lead to costly and ineffective approaches. http://www.piezomechanik.com Amplifiers, D/A Converters, Electronic HV-Switches for Piezoactuators 3
Page 1: Piezomechanik · Dr. Lutz Pickelman
Page 5 and 6: Actuators are normally classified b
Page 7 and 8: A further application is the active
Page 9 and 10: 3.3. Vibration control, acoustical
Page 11 and 12: 5. Special features Analog amplifie
Page 13 and 14: SQV analog amplifiers (low voltage/
Page 15 and 16: SQV 1/1000 single channel amplifier
Page 17 and 18: LE 150/100 single channel power amp
Page 19 and 20: High voltage power amplifiers LE 43
Page 21 and 22: LE 1000/100 single channel amplifie
Page 23 and 24: Power pulsers HVP (see sec. 2.8.) T
Page 25 and 26: AGV 150/013 amplifier This amplifie
Page 27 and 28: PC-AHV +150/1 single channel Output

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