Ultrasonic Motors for Precision Motion and Automation

What Is an Ultrasonic Motor / Why Use It?

An ultrasonic motor is a precision motion device that converts high-frequency vibration from a piezoelectric ceramic into smooth linear or rotary motion. Instead of using magnetic fields, coils, gears, or lead screws, the motor excites a piezoceramic element at ultrasonic frequencies. The vibration is transferred through a friction interface to a moving slider or rotor, producing very small steps that combine into continuous travel. Because the drive is solid-state, ultrasonic motors can be compact, quiet, fast, and highly responsive.

Ultrasonic motors are used where conventional electromagnetic motors become too large, too slow, or too mechanically complex. Typical applications include precision automation, optical positioning, microscope stages, semiconductor tools, medical devices, camera and lens mechanisms, compact linear actuators, vacuum-compatible positioning, and miniature mechatronic systems. They are especially useful when space is limited and when fast start-stop motion, fine positioning, or self-locking behavior is required.

Key advantages include high resolution, direct drive, low profile construction, no magnetic field generation, and excellent position stability when powered off. The self-locking friction principle allows the position to hold without continuous current, reducing heat. Ultrasonic motors also eliminate gears and backlash, enabling compact precision motion with fast response and clean mechanical integration.

Additional information on other types of piezo motors.

Watch Ultrasonic Motor Linear Actuator in Motion

Technical Resources