ULTRASONIC MOTORS
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ULTRASONIC MOTORS. PREPARED BY:-. Pintu Khan (10801610028) Dipkanta Mondal (10801610014) Dept . of Electrical Engineering ASANSOL ENGINEERING COLLEGE. OUTLINE. Introduction Piezoelectric Effect Advantages of USM Basic Principal Fundamental construction

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Prepared by

ULTRASONIC MOTORS

PREPARED BY:-

Pintu Khan (10801610028)

DipkantaMondal (10801610014)

Dept. of Electrical Engineering

ASANSOL ENGINEERING COLLEGE


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OUTLINE

  • Introduction

  • Piezoelectric Effect

  • Advantages of USM

  • Basic Principal

  • Fundamental construction

  • Types of USM

  • Working Mechanism

  • Application

  • Conclusion


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Introduction

  • It has been known for more than 30 years.

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

  • An Ultrasonic motor is a type of electric motor formed from the ultrasonic vibration of a component, the stator being placed against another, the rotor depending on the scheme of operation.

  • Conversion of electric energy into motion by inverse piezoelectric effect.


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Introduction

  • To obtain the levels of torque speed characteristics of USM using conventional motors we require to add a gear system to reduce the speed.

  • These characteristics of USM makes them attractive for robotic applications where small motions are required.

  • This motor achieves high speed and drive forces, while still permitting the moving part to be positioned with high accuracy.


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What is Piezoelectric Effect?

The piezoelectric effect is understood as the linear electromechanical interaction between the mechanical and the electrical state in crystalline materials with no inversion symmetry.

  • Piezoelectricity – generation 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.

  • Deformation is only 0.1 % of the original dimension.

  • Piezoelectric material- quartz(SiO2), barium titanate (BaTiO3) lead zirconatetitanate and occasionally lithium niobate .


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Advantage of Piezoelectric Motor

  • Electromagnetic motors are notorious for consuming high amount of power and creating high ambient motor temperatures respect to USM

  • The electromagnetic motors produce strong magnetic fields which cause interference. Ultrasonic motors use piezoelectric effect and hence no magnetic interference.

  • Electromagnetic motor has high input to output energy loss ratios

  • USM High positional accuracy respect to Electromagnetic Motor.

Vs.


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How !t Looks…

Piezoelectric Actuator

Rotor


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Basic Principle

  • Generation of gross mechanical motion through the amplification and repetition of micro-deformations of active material.

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

  • Frictional interface between the rotor and stator rectifies 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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Construction

Fundamental Construction of USM


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Ultrasonic motor by barth


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TYPES OF ULTRASONIC MOTOR


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Standing Wave USM

  • Mechanism

  • This type of motors use three groups of crystals: two of which are Locking and one Motive.

  • First, one group of locking crystals is activated — this gives one locked side and one unlocked side of the 'sandwich'.

  • Next, the motive crystal group is triggered and held — the expansion of this group moves the unlocked locking group along the motor path. This is the only stage where motor movement takes place.


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  • Mechanism

  • This type of motor commonly known under the names of Inchworm, Piezo LEGS or PiezoWalk motors


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TRAVELING WAVE USM

  • Superposition of multiple standing wave create a traveling wave.

  • Representation of travelling wave

    U(x ,p)= A cos(k x) cos(wt) + A cos(k x - 90)

    cos (wt-90).

  • Phase difference is 90 degree


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TRAVELING WAVE USM

  • The active material excites a traveling flexural wave within the stator that leads to elliptical motion of the surface particles.

  • Teeth are used to enhance the speed that is associated with the propelling effect of these particles.

  • The rectification of the micro-motion an interface is provided by pressing the rotor on top of the stator and the frictional force between the two causes the rotor to spin.


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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 scanning.


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Conclusion

Hence the ultrasonic motors, which is a new step in the miniaturized electrical technology has got many applications in small appliances because of its high torque at low density.


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Thank You….


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