ultrasonic motor

1. GOVERNMENT COLLEGE OF ENGINEERING ,
AURANGABAD
Ultrasonic Motor
Presented By:
Rahul Bibave (ME16F15F011)

2. Introduction
It has been known for more than 30 years.
The first ultrasonic motor was introduce by v.v lavrinko 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.

3. 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

4. Construction of USM

5. Types of USM
Ultrasonic
motor
Standing
wave
bidirectional unidirectional
Traveling
wave

6. Standing wave USM
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.

7. Travelling 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

8. 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.