Advantages of Xeryon's piezo technology
Next to the generic advantages of piezo stages, ultrasonic piezo motors have the following additional advantages, over stick-slip (or inertial) piezo motors and piezo steppers:
Due to the high frequency electric drive signals, the human ear is unsensitive for ultrasonic piezo motors. This feature makes ultrasonic piezo stages particularly suitable for noise-sensitive applications and for protecting the health and well-being of human operators.
Fast point to point positioning
Due to the high frequency driving principle, high maximum positioning speeds can be attained of over 100 millimeter per second.
Slow scanning speed
Most piezo stages are used for point to point positioning, but ultrasonic piezo motors can be programmed to follow low and constant speed motions of several micrometer per second. Depending on the speed, deviations smaller than 1% can be achieved, unlike the typical stepping or saw-tooth (stick-slip) motion patterns.
All piezo motors are susceptible to wear because of the frictional operating principle. Stick-slip and inertial piezo motors typically show a limited lifetime in the order of 1 to 10 kilometer, while piezo stepping motors are even more prone to wear. Ultrasonic piezo motors on the contrary have the advantage of achieving lifetimes of 100 kilometer and more.
Low power consumption
Xeryon’s ultrasonic piezo motor shows a very low power consumption, smaller than 1 Watt. These motors are always operated on natural eigenfrequencies and at these frequencies, the amplitude of motion is maximized for the applied electrical power. This is one of the reasons why these motors are used in portable, battery powered, devices.
Through the use of advanced control algorithms, it is possible to make individual positioning steps of nanometer level. Because of the static holding force it becomes possible to keep this extreme positioning resolution with zero drift.
Low voltage operation
Xeryon’s ultrasonic piezo motors are driven by low voltage signals, which are always smaller than 48 Volt peak to peak. For hand-held devices, the motor can be powered via a standard 5 V USB input voltage.
The position of ultrasonic piezo stages can be overridden manually, by overcoming the static friction force. This can be useful for coarse alignment and such an action will not influence the lifetime of the stage.