The USM which is a new step in the miniaturized electrical technology Many applications in small appliances because of its high torque at low density.USMs are not widely used for heavy motoring activities.

1. UltrasonicMotor(USM)
A Technical
Seminar On
BY
Naimesh Rama
15WJ1A0292

2. CONTENTS
➢ INTRODUCTION
➢ TYPE OF USM
➢ WORKING PRINCIPLE
➢ STRUCTURE
➢ CONSTRUCTION
➢ WORKING
➢ ADVANTAGES
➢ DISADVANTAGES
➢ APPLICATIONS
➢ CONCLUSION

3. INTRODUCTION
What is Motor?
Motor is a device which convert electricalenergyto mechanicalenergy
• Almost all the motors work on the principle of Faraday’sLaw
of Electromagnetic Induction.
• The energy conversionin such motors involves two
stages Electricalenergy to magneticenergy Magnetic
to mechanical energy.
• Because of two-stageelectromagnetic motor suffer from several losses that
lead to energy wastage

4. ➢A new class of motors using high power Ultrasonic motors were
introduced.
➢The ultrasonic motors also known as piezoelectric motors,which
directly convert electric energy to mechanical energy.
➢ The first ultrasonic motor was introduce by V.V Lavrinko in 1965
INTRODUCTION OF USM

5. The Disadvantages Of Electromagnetic motors
➢ Noisy operations
➢ Magnetic losses
➢ High power consumption
➢ Low power factor
➢ Comparatively lesser efficiency

6. TYPES OF ULTRASONIC MOTOR
ULTRASONIC
MOTOR
STANDING
WAVETYPE
TRAVELLING
WAVE TYPE
LINEAR
MOTOR
ROTARY
MOTOR
LINEAR
MOTOR
ROTARY
MOTOR

7. • LINEAR USM • ROTARY USM

8. PIEZOELECTRIC EFFECT
➢ In certain types of crystals when a pressure is applied across a
pair of opposite faces, an equivalent potential difference is
developed across the other pair of opposite faces.
➢ Converse of this phenomenon is also possible.
WORKING PRINCIPLE

9. ➢ Quartz(SiO2).
➢ Barium titanate (BaTiO3).
➢ Lead zirconate titanate(PbZrTiO3).
➢ Lithium niobate titanate(LiNbO3).
PIEZOELECTRIC MATERIAL USED

10. Compressing Force Potential difference

11. BASIC STRUCTURE

12. C O N S T R U C T I O N
The Ultrasonic Motors constitutes mainly four parts
Actuator
Stator
Rotor
Casing

13. ACTUATOR
➢ It is the driving unit.
➢ Made up of piezoelectric material (Quartz, Barium
Titanate, Tourmaline, Rochelle salt, etc).
➢ Fixed on the stator using thin metal sheets and bearings.
➢ Directly connected to the supply mains.
`

14. STATOR
➢ Stator is the stationary but vibrating part.
➢ It is constructed using a malleable material, usually steel.
➢ It can be of ring, cylindrical or rod shaped.

15. ROTOR
➢ It is the rotating part, which acquires the energy conversion
➢ Produces the desired torque on the shaft.
➢ It is made of the same material as that of the stator and does have
the same shape.

16. CASING
➢ To provide protection against abrasive forces, external
interferences and extreme environmental conditions.
➢ They are made of non-corrosive alloys or fiber.
➢ Cylindrical, disc or box shaped.

17. FUNDAMENTAL CONSTRUCTION OF USM

18. ➢ Consist of a high-frequency power supply.Connected to Vibrator.
➢ Vibrator is composed of a piezoelectric driving component and an
elastic vibratory part.
➢ The slider is composed of an elastic moving part and a friction
coat.

19. WORKING OF USM
➢ When the supply is switched ON, the actuator starts vibrating owing
to converse piezoelectric effect.
➢ The particles of the stator receive energy from the actuator and
starts vibrating in the plane.Results in the formation of a surface
wave.
➢ The stator and rotor are placed so close to each other that their
surfaces almost grazes upon each other.

20. ➢ The surface waves so produced ultrasonic frequency range.
➢ Not visible by our bare eyes.

21.  Wave propagates the rotor is pulled back in the opposite direction
of movement of the wave
 Surface wave is propagating in the anti-clockwise direction
Rotor is pulled to rotate in the clockwise direction.

22. • The shaft is mounted upon the rotor.
Rotor rotates and the output torque is
obtain.
• The stator and rotor always possess the same shape.

23. The other methods of classifications of USM
Type of motion
* Rotary
* Linear
* Spherical
Shape of
implementation
* Rod
* Disk
* Beam

24. ADVANTAGES
➢High output torque & efficiency
➢Good positioning accuracy
➢Capable of working in extreme environmental conditions.
➢Simple construction
➢Compact size.
➢Energy saving

25. DISADVANTAGE
➢ High frequency supply range
➢ Cost of Piezoelectric crystal
➢ Large field application is not possible now.

26. APPLICATIONS
Auto focusing & optical zooming in digital cameras
• Surveillance cameras.
• The disk heads of hard disks
• CD drives Controlling
• Wrist watches & Clocks
• Robotics
• Aerospace
• Medicine

27. Auto focusing& optical zooming

28. CASE STUDY
The case study is done in MRI robor by using PIEZO LEGS motors
ORAGNIZATION
Worcester Polytechnic Institute USA
INDUSTRY
Medical Robotic Surgical Tools USA

29. USM SPECIFICATION
Piezo LEGS Linear 10
➢ which moves a 100.8-mm drive rod over of 80 mm at speeds as
high as 10 mm/s.
➢ It delivers micro-steps
aslong as 4 μm with
nano-scale resolution.

30. Piezo LEGS Rotary 50
➢ which provides positioning over 360° at micro-radian resolutions.

31. CASESTUDY RESULTS
➢ They can capture ultra-high-resolution images of the
tumor using magnetic resonance imaging.
➢ They can use ultra-precise surgical tools to remove the tumor.
➢ Can operate within the high magnetic fields generated by
an MRI unit.

32. BEFORE USING USM AFTER USING USM

33. CONCLUSIONS
➢ The USM which is a new step in the miniaturized electrical
technology
➢ Many applications in small appliances because of its high torque at
low density.
➢ USMs are not widely used for heavy motoring activities.
➢ World might be expected in the near future that replaces the futile
electromagnetic motors by the proficient ultrasonic motors.

34. THANK YOU