![]() The working principle of these motors has been well known for at least 50 years. The system composed of the motor, power electronics, and closed-loop control will be called the ultrasonic actuator or piezoelectric actuator. In this work, the term “USM” will be used for the motor only (in other words, power electronics and closed-loop controls are not included). This report also deals with ultrasonic motors (USMs) that belong to the class of piezoelectric motors. A number of these concerns relate to basic material science issues in the manufacture of the piezoelectric actuators for these targeted, diversified applications. Cost, yield and reliability are important concerns for each of these six applications. Market pull is generated by large demand for ultra-small scale precision motion devices used in manufacturing and inspection equipment, high volume, low cost auto-focus assemblies required in phone cameras, and high volume, moderate cost ink printing cartridges used in printers and partly by demand for micro actuator medical tools used in minimally invasive surgery and micro-grippers required in manufacturing micro-sized objects such as stents and partly by dynamically-driven high temperature actuators for diesel injector valves in automobiles. Piezoelectric actuators are at an important stage of development into a large component market. ![]() Only piezo actuation allows top innovations in mechatronics like nano-positioning or high pressure common rail fuel injection. Highlights are unlimited positioning sensitivity (sub-nanometers), high load capability, and high force generation, resulting in ideal mechanical dynamics with reaction times down to microseconds. ![]() Piezo actuators are electromechanical “motors”, based on the solid state piezomechanical deformation effect of piezoceramics (PZT lead zirconium titanate). Multi-User License at the Same Location - US$4,950.00
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