This section provides an overview for ultrasonic motors as well as their applications and principles. Also, please take a look at the list of 7 ultrasonic motor manufacturers and their company rankings.
Table of Contents
Ultrasonic motors are motors that use ultrasonic waves with a frequency of 20 kHz or higher to move a rotor. While ordinary motors use permanent magnets or coils to rotate the rotor, ultrasonic motors use piezoelectric elements to generate ultrasonic waves to function as a motor.
The features of ultrasonic motors compared to motors that use common permanent magnets or coils are as follows:
On the other hand, it also has the following drawbacks:
Ultrasonic motors are used in precision positioning mechanisms for autofocusing SLR cameras, scanning electron microscopes, semiconductor manufacturing equipment, micro machine manufacturing equipment, etc., taking advantage of the above I-V advantages.
In addition, taking advantage of its low-speed, high-torque performance and its ability to maintain torque even when not energized, it is also used for raising and lowering roll screens and curtains, positioning headrests, and other applications. Furthermore, taking advantage of the fact that they are not affected by magnetic forces, they are also used in the main bodies and peripheral equipment of MRIs, which are medical diagnostic equipment that uses magnetism.
The following is an explanation of the principle of operation of ultrasonic motors. First of all, the piezoelectric elements used for driving are arranged and adjusted according to the following procedure:
The piezoelectric element vibrates up and down, and the vibration is transmitted to the top surface of the thin rod to which the piezoelectric element is attached.
The size of the piezoelectric elements, the way they are arranged, the voltage value to be applied, the frequency of the voltage, the material and thickness of the thin rod, and other factors are adjusted to ensure the most efficient transmission of the tremors.
When the basic piezoelectric elements are ready, we attach a regular line of protrusions to the top surface of the thin rod. In this state, voltage is applied to the piezoelectric element to generate a sine wave on the surface of the thin rod.
Then, as the sine wave moves to the right, the protrusions move one after the other, and if you follow the apex of the protrusions, you will see a counterclockwise elliptical motion.
If a thin plate is placed on top of this thin rod, this plate will move in the opposite direction of the wave, i.e., from right to left. This is the outline of the principle of operation of ultrasonic motors.
In ultrasonic motors, the "thin rod" is called the stator and the "thin plate" is called the rotor.
*Including some distributors, etc.
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Ranking as of March 2023 in United States of AmericaDerivation Method
|1||Renown Electric Motors & Repair Inc.||50%|
|2||Wischnewskiy Ultrasonic Motors||16.7%|
Ranking as of March 2023 GloballyDerivation Method
|1||Renown Electric Motors & Repair Inc.||40%|
|2||Wischnewskiy Ultrasonic Motors||20%|
|3||Dynamic Structures & Materials, Inc.||13.3%|
Derivation MethodThe ranking is calculated based on the click share within the ultrasonic motor page as of March 2023. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.
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