Where are piezoelectric motors used?
Piezoelectric effect is very useful within many applications that involve the production and detection of sound, generation of high voltages, electronic frequency generation, microbalances, robotics, medical engineering, high power applications, sensors, piezoelectric motors ultra fine focusing of optical assemblies.
What is a piezoelectric stage?
A Piezo Stage can be characterized as a mechanical device, driven by a piezoelectric actuator, which provides one or more axis of motion. The term nanopositioning is used to indicate the technology of moving and measuring with nm precision.
How is piezoelectricity produced?
A piezoelectric crystal is placed between two metal plates. At this point the material is in perfect balance and does not conduct an electric current. Mechanical pressure is then applied to the material by the metal plates, which forces the electric charges within the crystal out of balance.
What is the structure of piezoelectric?
In a nutshell: Piezoelectricity is the process of using crystals to convert mechanical energy into electrical energy, or vice versa. Regular crystals are defined by their organized and repeating structure of atoms that are held together by bonds, this is called a unit cell.
What is the drive principle of a piezo motor?
The drive principle relies on a quasi-saw tooth signal with a slow expansion phase and a fast contraction phase. When the piezo element has reached its maximum expansion, a much shorter contraction phase follows – too fast for the moving mechanism to follow, because of its inertia. A tangential inertia motor drive element.
What are the different types of piezo motors?
There are a number of linear and rotary principles based on slow or high-frequency oscillatory motions. Basically, piezo motors can be grouped into three main types: resonance-motors (ultrasonic drives), inertia-motors (stick-slip principle), and piezo-walk drives.
How many actuators are in a stepping piezo motor?
A typical stepping piezo motor consists of at least three piezo actuators. Some of the actuators are in contact with the slider (i.e. actuator A and B in Figure 2) and act as a clamping mechanism, while others are used to generate the translational motion of the slider (i.e. piezo C in Figure 2).
What is piezoelectric oscillation?
Piezoelectric oscillating element to obtain mechanical movement as described in an early US Patent by Meissner, US Patent 1,804,838 A, 12 May 1931. Ultrasonic piezo motors (resonant motors), piezo stepping motors and inertia motors vary in principle.