22-08-2012, 10:59 AM
ULTRASONIC MOTOR
ultrsoinc ppt.pptx (Size: 194.92 KB / Downloads: 55)
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 drive forces,while still permitting the moving part to be positioned with high accuracy.
PIEZOELECTRIC NOTION
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.
Piezoelectric material- quartz(SiO2), barium titanate (BaTiO3).
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).
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
BIDIRECTIONAL MOTOR
For linear motion bidirectional drives are required .
More than two actuators are used.
These actuators must have some phase difference
It can be obtained by superimposing to oscillations in a single resonator.
Stator is hybrid construction consisting of several actuators.
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
ultrsoinc ppt.pptx (Size: 194.92 KB / Downloads: 55)
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 drive forces,while still permitting the moving part to be positioned with high accuracy.
PIEZOELECTRIC NOTION
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.
Piezoelectric material- quartz(SiO2), barium titanate (BaTiO3).
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).
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
BIDIRECTIONAL MOTOR
For linear motion bidirectional drives are required .
More than two actuators are used.
These actuators must have some phase difference
It can be obtained by superimposing to oscillations in a single resonator.
Stator is hybrid construction consisting of several actuators.
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