Piezo inertia motors incorporate “jaws” that grip a lead screw on either side, turning the screw as the actuator expands and contracts.I have an ultrasonic piezoeletric transducer that needs to be driven by a frequency between 130KHz and 140KHz and I am planning to control this circuit (turn it on/off, change the frequency within this range) using a uno arduino board. As the actuator rapidly expands and contracts, the jaws turn the screw. In this design, jaws attached to each end of a piezo actuator engage with the screw, 180 degrees apart. While inertia motors don’t produce rotary motion directly, they’re often used to drive very fine pitch screws. Piezo inertia motors (commonly referred to as “stick-slip” motors) can also be configured to produce rotary motion. The same principle can be applied to a ring to produce rotary motion. In a piezo walking motor, pairs of “legs” work together to produce motion in a longitudinal rod. Although each “step” is just a few microns, operating at high frequency provides thousands of steps per second, for high rotational speeds. On the next activation, the first pair of legs retracts and moves backwards while the second pair extends to make contact with the ring and move it further along its direction of rotation. At the same time, the second pair of legs retracts away from the ring and moves in the opposite direction. The piezo actuators are synchronized in pairs – often referred to as “legs.” When voltage is applied, the first pair of legs extends, grips the ring, and moves it in the desired direction. These designs use multiple piezo bending actuators (or a combination of clamping and shear actuators) to rotate a ring. As the actuators oscillate, they advance the ring and cause it to rotate.Īnother piezo technology that can produce rotary motion is the walking type piezo motor. In this design, two piezo actuators are mounted tangentially on a ring. With each oscillation of the actuators, friction tips contact the ring and advance it, causing it to rotate. In an ultrasonic motor, multiple piezo actuators oscillate at high frequency, contacting the ring and causing it to rotate.Ī variation of this design uses two ultrasonic piezo actuators, mounted and preloaded tangentially on a friction ring. The vibrations of the stator are transmitted to the rotor through the friction element, causing the rotor to turn at high speed. When high-frequency AC voltage is applied to the stator, it causes wave-like, ultrasonic vibrations in the piezo actuators. To achieve rotary motion, several piezo actuators are arranged in a ring-shaped formation, sometimes referred to as the “stator,” and the linear runner is replaced with a ring-shaped rotor. Linear ultrasonic piezo motors incorporate a piezo actuator, a friction component, and a runner. And while most piezo motors are designed to produce linear motion, there are several types that can also produce rotary motion, making them suitable for applications such as optical equipment and measuring devices. Based on the piezo actuator – layers or stacks of piezo elements that produce motion through the reverse piezoelectric effect – the piezo motor incorporates mechanical elements to produce strokes of several hundred millimeters or more. One of the best technologies for achieving extremely small, precise movements is the piezo motor.
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