ULTRASONIC MOTOR.pptx

7/28/2019 ULTRASONIC MOTOR.pptx

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PREPARED BYASH KUMAR SHAH

REGISTRATION NO=0901294304BRANCH=ECE

COLLEGE=RAAJDHANI ENGINEERING COLLEGE ,BBSR


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1. INTRODUCTION2. PIEZOELECTRIC NOTION3. PIEZOELCRIC MOTOR NOTION4. BASIC PRINCIPLE

5. CONSTRUCTION6. TYPES7. MAJOR APPLICATION8. MERITS AND DEMERITS

9. CONLUSION10. REFERENCE


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It has been known for more than 30 years.

The first ultrasonic motor was introduce by v.vlavrinko in 1965.

Conversion of electric energy into motion byinverse piezoelectric effect.

This motor achieves high speed and drive

forces,while still permitting the moving part tobe positioned with high accuracy.


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Change in shape of piezoelectric material when electric field

is applied.

It can be abbreviated as USM.

It is driven by ultrasonic vibration of transducer. The ultrasonic vibration is transformed into output torque (in

rotary USM) or thrust (in linear USM) by the friction

between the stator and the rotor (in rotary USM) or the

moving part (in linear USM).


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generation of gross mechanical motion through theamplification and repetition of micro-deformationsof active material.

The active material induces an orbital motion of thestator at the rotor contact points .

frictional interface between the rotor and statorrectifies the micro-motion to produce macro-motion

of the ROTOR. Working frequency-20 KHz to 10 MHz

Amplitude of the actuator motion 20 to 200nm


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The active material excites a travelingflexural wave within the stator thatleads to elliptical motion of the surface

particles.Teeth are used to enhance the speedthat is associated with the propellingeffect of these particles.The rectification of the micro-motionan interface is provided by pressing therotor on top of the stator and thefrictional force between the two causesthe rotor to spin.


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Fundamental construction of USM


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Ultrasonic

motor

Standingwave

bidirectional unidirectional

Travelingwave


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Low cost

one vibration source

Unidirectional

High efficiency


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Requires two vibrating source

Low efficiency.


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For linear motion bidirectional drives arerequired .

More than two actuators are used. These actuators must have some phase

difference

It can be obtained by superimposing to

oscillations in a single resonator. Stator is hybrid construction consisting of

several actuators.


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Camera auto focus lenses

Driving fluid

Watch motors and compact

paper handling.

Optoelectronics area

In micro surgery and sensor

scaning.


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Low cost

High efficiency

No magnetic

interference Compact size

High power/weightratio.

Use of high frequencypower supply

Less durability

Drooping torquespeed characteristic.


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These motors are very advantageous.

Electromagnetic interference is not there.

It is in great demand in the area automationand miniaturization.

These motors are low cost


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www.google.com

www.yahoo.com

www.slideworld.com

www.pdf-searchengine.com

www.ask.com

http://www.americanpiezo.com/piezo_theory

/piezo_theory.pdf
http://www.google.com/http://www.yahoo.com/http://www.slideworld.com/http://www.pdf-searchengine.com/http://www.ask.com/http://www.americanpiezo.com/piezo_theory/piezo_theory.pdfhttp://www.americanpiezo.com/piezo_theory/piezo_theory.pdfhttp://www.americanpiezo.com/piezo_theory/piezo_theory.pdfhttp://www.americanpiezo.com/piezo_theory/piezo_theory.pdfhttp://www.ask.com/http://www.pdf-searchengine.com/http://www.pdf-searchengine.com/http://www.pdf-searchengine.com/http://www.slideworld.com/http://www.yahoo.com/http://www.google.com/


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ULTRASONIC MOTOR.pptx