Ultrasonic motor

Update date:2018-05-02 Source:MAXGE

Ultrasonic motor

1, comprehensive multidisciplinary wisdom product

Ultrasonic Motor, abbreviated as USM, is a new concept of drive device developed in recent years. It utilizes the inverse effect of piezoelectric material (ie, electrostrictive effect) to convert electrical energy into ultrasonic vibration of the elastomer and drive it through friction. The method is converted into a moving body or a rectilinear motion. Ultrasonic motors link the unrelated concepts of electrostriction, ultrasonic vibration, and wave theory with motors to create a totally new type of motor, which is a comprehensive multidisciplinary wisdom product.


2, the advantages of traditional motors can not match

Low speed and high torque: In ultrasonic motors, the amplitude of ultrasonic vibration generally does not exceed a few microns, and the vibration speed is only a few centimeters per second to a few meters per second. The speed of the rotor is determined by the vibration speed when there is no sliding, so the rotation speed of the motor is generally very low, and only a dozen to several hundred revolutions per minute.

Small size and light weight: Ultrasonic motors do not use coils or magnets, and their structures are relatively simple. Compared with ordinary motors, they can be made smaller, lighter, and more plentiful under the same output torque.

The reaction speed is fast and the control characteristics are good: the ultrasonic motor is driven by friction, the mass of the moving body is light, the inertia is small, the response speed is fast, and the starting and stopping times are in the order of milliseconds. So it can achieve high-precision speed control and position control.

No electromagnetic interference: The ultrasonic motor has no magnetic pole and is therefore not affected by electromagnetic induction. At the same time, it does not produce electromagnetic interference to the outside world and is particularly suitable for working environments under strong magnetic fields. In the strict requirements of EMI (electromagnetic interference), the use of ultrasonic motors is also very suitable.

When it is stopped, it has a holding torque: the rotor and stator of the ultrasonic motor are always in close contact. After the power is cut off, due to the static friction force, there is still a large holding torque without using the brake device, which is especially suitable for the operation in the weightless environment of the aerospace industry.

Flexible form, large degree of freedom in design: The structure of the part where the driving force of the ultrasonic motor is generated can be flexibly designed as required.


3, ultrasonic motor show their abilities

Ultrasonic motors have many characteristics that electromagnetic motors do not possess. Although the invention and development time of ultrasonic motors are short, they have been successfully applied in aerospace, robotics, automotive, precision positioning, medical devices, and micro-machinery.

Japan's Canon Corporation applies ultrasonic motors to the lenses of high-end SLR cameras; Europe uses ultrasonic motors for experimental platforms and micro-motion equipment, such as the Scanning Tunneling Microscope (STM) that won the Nobel Physics Prize in 1986; the United States in spacecraft and Mars. In the aerospace engineering such as detectors, missiles, and nuclear warheads, ultrasonic motors have also been applied one after another. Our country also applied ultrasonic motor on the “Changsan 3” moon detector to use as an infrared imaging spectrometer to drive and control the spectrometer. Through the capture and analysis of light information, the spectrometer can detect what is on the lunar surface. .

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