Ultrasonic motors use piezoelectric materials to generate ultrasonic vibrations that produce motion. They were first introduced in 1965 and have advantages over traditional electromagnetic motors like higher torque at lower speeds, greater precision, and no magnetic interference. Common piezoelectric materials used include quartz, barium titanate, and lead zirconate titanate. Ultrasonic motors find applications in areas like cameras, watches, printers, and medical devices due to their small size and precision.
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The terms atomic battery, nuclear battery, tritium battery and radioisotope generator are used to describe a device which uses energy from the decay of a radioactive isotope to generate electricity. Like nuclear reactors they generate electricity from atomic energy, but differ in that they do not use a chain reaction.
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The terms atomic battery, nuclear battery, tritium battery and radioisotope generator are used to describe a device which uses energy from the decay of a radioactive isotope to generate electricity. Like nuclear reactors they generate electricity from atomic energy, but differ in that they do not use a chain reaction.
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Electric cars are automobiles, which are powered by the electric engine and electric energy. The development of the electric vehicles is a very perspective and important process. Scientists and engineers managed to create electric engines which are no less effective than the ordinary engines used today. It is obvious that electric cars are more ecologically safe and require less energy for work. EVs provide fast acceleration by delivering power instantly to the wheels by providing high torque at low speeds; they give a feel of smooth and quick responsiveness (Technology).
Ultrasonicmotorbychandanbehera 121126043528-phpapp01AJMAL OB
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
A presentation done for part of my A-level studies, and also for my personal interest too.
Some materials are 'shamefully' from the Internet, so please message me if you find that your copyright is seriously infringed.
Working of synchronous machine, Construction of synchronous machine, Types o...Self-employed
Subject : AC Machine
Topic: Working of synchronous machine, Construction of
synchronous machine, Types of synchronous machine,
Application of synchronous machine
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UI automation Sample
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Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
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In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
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All of this illustrated with link prediction over knowledge graphs, but the argument is general.
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In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
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Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
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Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
Connector Corner: Automate dynamic content and events by pushing a button
Ultrasonic motor
1.
2.
3. • 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.
4. • 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.
5. 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 zirconate titanate and occasionally lithium niobate .
6. 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.
7.
8. • 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
11. Ultrasonic
motor
Standing Traveling
wave wave
bidirectional unidirectional
12. 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.
13. This type of motor commonly known under the names
of Inchworm, Piezo LEGS or PiezoWalk motors
14. • 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
15. •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.
16. • Camera auto focus lenses
• Driving fluid
• Watch motors and compact
paper handling.
• Optoelectronics area
• In micro surgery and sensor
scanning.
17. 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.