![]() With this combination, the amplification ratio can achieve more than 10 times. Later, the company introduced another kind of secondary amplification mechanism by using the lever arm and spring leaf. from EM Precicison Technologies Ltd.(later renamed Mechano Transformer Corporation). The lever arm amplification method were used as amplified piezoelectric actuator in 1980s as a piezoelectric impact printer element by T.Yano et al. Lever arm amplification Īnother 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. More movers result in more force at similar displacement. In diamond shaped amplifiers, using 4 piezo crystals instead of one increases control of movement, particularly in changing temperatures. Actuators of this type can have a stroke of 2 mm. This separation allows inverted geometries, allowing either contraction or expansion of the output even if the dominant motion of the piezo is expansion. The other advantage is that this kind of flextentional actuator is very reliable.ĭisplacement amplification can also be accomplished by using rigid struts connected by flexure bearings. It has also to apply the correct pre-stress to the piezoelectric material in order to allow dynamic and precise motion. The goal of the elliptic shell is not only to amplify the displacement. ![]() The amplification ratio can typically reach 20 times, that means such actuators can reach strokes of 1 mm. A small deformation of the great axis creates a large displacement of the small axis. The ceramic stack is aligned with the great axis of the ellipse. The principle is based on the deformation of an elliptic shell to amplify the ceramic strain. The solution to reach middle range stroke is to use an amplification system. As classical piezoelectric materials have a strain of 0.1%, it is practically impossible to reach significant stroke without displacement amplification (1 mm displacement would require 1 meter of piezoelectric material). Amplified piezoelectric actuators are specific actuators using piezoelectric materials as active material and have a specific design to overcome traditional limitations of classical direct piezoelectric actuators, the limited stroke.
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