ultrsoinc ppt

7/29/2019 ultrsoinc ppt

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PREPARED BY:-KAPIL KUMARROLL NO:-2708511,8TH SEM

BRANCH:-EEEJCDM COLLEGE OF ENGG.,SIRSA


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1. INTRODUCTION2. PIEZOELECTRIC NOTION

3. PIEZOELCRIC MOTOR NOTION

4. BASIC PRINCIPLE

5. CONSTRUCTION6. TYPES

7. MAJOR APPLICATION

8. MERITS AND DEMERITS

9. CONLUSION10. REFERENCE


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INTRODUCTION

It has been known for more than 30 years.

The first ultrasonic motor was introduce by

v.v lavrinko in 1965. Conversion of electric energy into motion by

inverse piezoelectric effect.

This motor achieves high speed and driveforces,while still permitting the moving partto be positioned with high accuracy.


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PIEZOELECTRIC NOTION

Piezoelectricitygeneration of voltage in response of

mechanical stress.

The word is derived from the Greek piezein, which means

to squeeze or press. This effect is also reversible.

Piezoelectric material- quartz(SiO2), barium titanate

(BaTiO3).


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PIEZOELECTRIC MOTOR NOTION

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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BASIC PRINCIPLE

generation of gross mechanical motion throughthe amplification and repetition of micro-deformations of active material.

The active material induces an orbital motion ofthe stator 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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BASIC PRINCIPLE

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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Construction

Fundamental construction ofUSM


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Ultrasonic motor by barth


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TYPES OF ULTRASONIC MOTOR

Ultrasonicmotor

Standingwave

bidirectional unidirectional

Travelingwave


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Standing wave USM

Low cost

one vibration source

Unidirectional

High efficiency


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Travelling wave USM

Requires two vibrating source

Low efficiency.


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BIDIRECTIONAL MOTOR

For linear motion bidirectional drives arerequired .

More than two actuators are used.

These actuators must have some phasedifference

It can be obtained by superimposing tooscillations in a single resonator.

Stator is hybrid construction consisting ofseveral actuators.


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MAJOR APPLICATION

Camera auto focus lenses

Driving fluid

Watch motors and compact

paper handling.

Optoelectronics area

In micro surgery and sensor

scaning.


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Merits Demerits

Low cost

High efficiency

No magneticinterference

Compact size

High power/weight

ratio.

Use of high frequency

power supply

Less durability

Drooping torque speed

characteristic.


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CONCLUSION

These motors are very advantageous.

Electromagnetic interference is not there. It is in great demand in the area automation

and miniaturization.

These motors are low cost


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REFERENCE

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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THANKYOU

ultrsoinc ppt

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