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a piezoelectric impact printer element by T.Yano et al. from EM Precicison
Technologies Ltd.(later renamed Mechano Transformer Corporation). Later, the company introduced another kind of secondary amplification mechanism by using the lever arm and spring leaf. With this combination, the amplification ratio can achieve more than 10 times.
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Another method of amplifying the piezo stroke is to use a lever arm, which can be a primary or a secondary amplification mechanism, and can be used to generate displacements with 10 to 40 times magnification. The lever arm amplification method were used as amplified piezoelectric actuator in 1980s as
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materials as active material and have a specific design to overcome traditional limitations of classical direct piezoelectric actuators, the limited stroke. As classical piezoelectric materials have a strain of 0.1%, it is practically impossible to reach significant stroke without displacement
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The goal of the elliptic shell is not only to amplify the displacement. It has also to apply the correct pre-stress to the piezoelectric material in order to allow dynamic and precise motion. The other advantage is that this kind of flextentional actuator is very reliable.
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are also studying such solutions. The space industry's interest in amplified piezoelectric actuators is due to the high power density of these actuators, high positioning accuracy, high reliability, and low power losses when used in
51:. This separation allows inverted geometries, allowing either contraction or expansion of the output even if the dominant motion of the piezo is expansion. Actuators of this type can have a stroke of 2 mm.
40:. A small deformation of the great axis creates a large displacement of the small axis. The amplification ratio can typically reach 20 times, that means such actuators can reach strokes of 1 mm.
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In diamond shaped amplifiers, using 4 piezo crystals instead of one increases control of movement, particularly in changing temperatures. More movers result in more force at similar displacement.
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using active flaps has been investigated for some time without being put into production. The most commonly used technology is the amplified piezoelectric actuator.
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amplification (1 mm displacement would require 1 meter of piezoelectric material). The solution to reach middle range stroke is to use an amplification system.
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Amplified piezoelectric actuators have no sliding parts due to the flexural hinges and do not require lubrication. Lubrication-free performance is important for
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T.YANO, S.K.CHEE, K.KAZUO, S.HARADA, T.HIGUCHI,"A New Type of
Mechanical Transformer with High Stroke Magnification Ratio", ACTUATOR 2008, pp. 71–74, 2008
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The principle is based on the deformation of an elliptic shell to amplify the ceramic strain. The ceramic stack is aligned with the great axis of the
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Piezoelectric actuators, and especially amplified piezoelectric actuators, have been historically studied and used in aerospace applications.
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Piezoelectric actuators can also be made with nonmagnetic materials, which allows their use in
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302:"What is Amplified Piezoelectric Actuator (MechaTrans®) ? ｜Mechano Transformer Corp"
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Kenji Uchino, International Center for
Actuators and Transducers, Penn State University.
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Displacement amplification can also be accomplished by using rigid struts connected by
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223:"Piezoelectric Actuation Mechanisms: Flextensional Piezo-Actuator Operation"
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A New Type of
Mechanical Transformer with High Stroke Magnification Ratio
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Piezoelectric
Actuators: Control Applications of Smart Materials
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PIEZOELECTRIC IMPACT PRINTER DEVELOPMENT IN THE 1980's
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161:European Space Agency, Published March 1998.
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172:Introduction to Piezoelectric Actuators
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159:Amplified Piezoelectric Actuators
17:Amplified piezoelectric actuators
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270:. Retrieved: 28 September 2010.
198:Seung-Bok Choi, Young-Min Han
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258:New actuators for aerospace
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332:NASA's cryogenic actuators
306:mechano-transformer.com
184:Piezoelectric Actuators
147:helicopter rotor blades
63:Lever arm amplification
178:Piezo Motor Comparison
263:14 July 2011 at the
32:Single-cell actuator
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55:Multi-cell actuator
91:. You can help by
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133:cryogenics
100:March 2010
350:Actuators
21:actuators
344:Category
261:Archived
239:19 April
38:ellipse
268:Noliac
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