A Seminar

on

ULTRASONIC MOTORSBy

Y.CHAKRI VENKATA DINESH(13HM1A0217)

Department of Electrical And Electronics EngineeringAnnamacharya Institute of Technology and Sciences

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Contents Introduction

Drawbacks of Electro Magnetic Motors

Principle of operation

Construction

Working

Characteristic features

Advantages & Disadvantages

Applications

Conclusion

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Introduction A motor is a machine which converts electrical energy

into mechanical energy.

UltraSonic Motors (USMs) are next generation motors.

The first USM was developed by Russian scientist in 1965

USMs are characterized by the absence of noise during operation , high accurate speed and position control etc.,

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Drawbacks of Electro Magnetic Motors Noisy operation

Less efficiency

High motor temperatures

High cost

Increased size with increase in rating of motor

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Principle of operationUSM works on the principle of Converse Piezoelectric

Effect.

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(a) When applied DC voltage has same polarity(b) When applied DC voltage has opposite polarity(c) When AC voltage is applied

Construction

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Piezoelectric Ceramics

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WorkingWhen high frequency voltage (>20 KHz) is applied

piezoelectric material vibrates.There are two power transformations involved in running of

USM.(a)Conversion of Electrical energy into mechanical vibrational energy by Inverse Piezoelectric Effect.(b)Vibrational energy of stator is transformed into continuous moving energy of rotor due to frictional interaction between stator and rotor.

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Characteristics of USM

Simple constructionAbsence of magnetic actionLow SpeedHigh TorqueQuick responseNoiselessCompactLightweight

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Advantages of USMLow AC voltage excitationHigh torque at low speedsShort time responseUltra small size can be easily miniaturizedDust freeNoiseless operationHigh efficiencyHigh torque/weight ratioNo magnetic interference

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Disadvantages of USMPiezoelectric materials are expensive

Requires high frequency power supply (>20 KHz)

Ultrasonic noise occurs

Due to friction life of motor reduces

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ApplicationsAuto focusing & optical zooming in digital camerasAutomatic wrist watchesPower windowsRoll screen motor for automatic open & close actionsActuators for VCRs & CD players RoboticsWall clocksUltrasonic welding

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Conclusion

The above mentioned advantages and applications concludes scope of USMs in day - to -day life.

However, disadvantages brings up need for further researches in fields.

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Any Queries??