This document presents information about eddy current brakes. It begins with an introduction to eddy currents and how eddy current brakes work by inducing currents in conductive materials placed in changing magnetic fields. It describes both circular and linear eddy current brake systems, providing examples of their use in trains. The document discusses the principles, advantages, and disadvantages of eddy current brakes. It applies eddy current braking concepts to applications like trains and rollercoasters, and envisions future improvements and expanded use of the technology.
Eddy currents are loops of electrical current induced within conductors by a changing magnetic field in the conductor, due to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field.
The magnitude of the current in a given loop is proportional to the strength of the magnetic field, the area of the loop, and the rate of change of flux, and inversely proportional to the resistivity of the material.
This Project was directed at creating an integrated electric motor and eddy current brake. This combination is designed to be used in the automotive industry as an electric all-wheel drive system that can be managed by available traction and stability control technology. This project addresses the physical concept of using an induced electromagnetic field to slow the proposed vehicle speed. The main goal is lessening the lifetime maintenance of a vehicle and eliminating several high maintenance items. This system is designed as a “frictionless” system and although it is not completely frictionless it eliminates the need for standard hydraulic brake pads and rotors which wear and fail due to friction material loss. This saves the consumer's time and money in maintenance.
Eddy currents are loops of electrical current induced within conductors by a changing magnetic field in the conductor, due to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field.
The magnitude of the current in a given loop is proportional to the strength of the magnetic field, the area of the loop, and the rate of change of flux, and inversely proportional to the resistivity of the material.
This Project was directed at creating an integrated electric motor and eddy current brake. This combination is designed to be used in the automotive industry as an electric all-wheel drive system that can be managed by available traction and stability control technology. This project addresses the physical concept of using an induced electromagnetic field to slow the proposed vehicle speed. The main goal is lessening the lifetime maintenance of a vehicle and eliminating several high maintenance items. This system is designed as a “frictionless” system and although it is not completely frictionless it eliminates the need for standard hydraulic brake pads and rotors which wear and fail due to friction material loss. This saves the consumer's time and money in maintenance.
An eddy current brake, like a conventional friction brake, is a device used to slow or stop a moving object by dissipating its kinetic energy as heat. However, unlike electro-mechanical brakes, in which the drag force used to stop the moving object is provided by friction between two surfaces pressed together, in an eddy current brake the drag force is an electromagnetic force between a magnet and a nearby conductive object in relative motion, due to eddy currents induced in the conductor through electromagnetic induction. A conductive surface moving past a stationary magnet will have circular electric currents called eddy currents induced in it by the magnetic field, due to Faraday's law of induction. By Lenz's law, the circulating currents will create their own magnetic field which opposes the field of the magnet. Thus the moving conductor will experience a drag force from the magnet that opposes its motion, proportional to its velocity. The electrical energy of the eddy currents is dissipated as heat due to the electrical resistance of the conductor. In an electromagnetic brake the magnetic field may be created by a permanent magnet, or anelectromagnet so the braking force can be turned on and off or varied by varying the electric current in the electromagnet's windings. Another advantage is that since the brake does not work by friction, there are no brake shoe surfaces to wear out, necessitating replacement, as with friction brakes. A disadvantage is that since the braking force is proportional to velocity the brake has no holding force when the moving object is stationary, as is provided by static friction in a friction brake, so in vehicles it must be supplemented by a friction brake. Eddy current brakes are used to slow high-speed trains and roller coasters, to stop powered tools quickly when power is turned off, and in electric meters used by electric utilities.
Contents- Introduction of eddy current Introduction of eddy current brake Circular eddy current brake Linear eddy current brake How eddy current brake works? Advantages Disadvantages Applications Future Aspects conclusion
Electromagnetic braking for physically challenged peopleJustin Mathew
This is a part of our project. We are designing an easy driving system for physically challenged people. And we found that this is the faster, smatter and better braking system. This is the future of braking system in automobile.
Now a days world is shifting towards electrified mobility to reduce the pollutant emissions caused by nonrenewable fossil fueled vehicles and to provide the alternative to pricey fuel for transportation. But for electric vehicles, traveling range and charging process are the two major issues affecting it’s adoption over conventional vehicles.
With the introduction of Wire charging technology, no more waiting at charging stations for hours, now get your vehicle charged by just parking it on parking spot or by parking at your garage or even while driving you can charge your electric vehicle. As of now, we are very much familiar with wireless transmission of data, audio and video signals so why can’t we transfer power over the Air.
An eddy current brake, like a conventional friction brake, is a device used to slow or stop a moving object by dissipating its kinetic energy as heat. However, unlike electro-mechanical brakes, in which the drag force used to stop the moving object is provided by friction between two surfaces pressed together, in an eddy current brake the drag force is an electromagnetic force between a magnet and a nearby conductive object in relative motion, due to eddy currents induced in the conductor through electromagnetic induction. A conductive surface moving past a stationary magnet will have circular electric currents called eddy currents induced in it by the magnetic field, due to Faraday's law of induction. By Lenz's law, the circulating currents will create their own magnetic field which opposes the field of the magnet. Thus the moving conductor will experience a drag force from the magnet that opposes its motion, proportional to its velocity. The electrical energy of the eddy currents is dissipated as heat due to the electrical resistance of the conductor. In an electromagnetic brake the magnetic field may be created by a permanent magnet, or anelectromagnet so the braking force can be turned on and off or varied by varying the electric current in the electromagnet's windings. Another advantage is that since the brake does not work by friction, there are no brake shoe surfaces to wear out, necessitating replacement, as with friction brakes. A disadvantage is that since the braking force is proportional to velocity the brake has no holding force when the moving object is stationary, as is provided by static friction in a friction brake, so in vehicles it must be supplemented by a friction brake. Eddy current brakes are used to slow high-speed trains and roller coasters, to stop powered tools quickly when power is turned off, and in electric meters used by electric utilities.
Contents- Introduction of eddy current Introduction of eddy current brake Circular eddy current brake Linear eddy current brake How eddy current brake works? Advantages Disadvantages Applications Future Aspects conclusion
Electromagnetic braking for physically challenged peopleJustin Mathew
This is a part of our project. We are designing an easy driving system for physically challenged people. And we found that this is the faster, smatter and better braking system. This is the future of braking system in automobile.
Now a days world is shifting towards electrified mobility to reduce the pollutant emissions caused by nonrenewable fossil fueled vehicles and to provide the alternative to pricey fuel for transportation. But for electric vehicles, traveling range and charging process are the two major issues affecting it’s adoption over conventional vehicles.
With the introduction of Wire charging technology, no more waiting at charging stations for hours, now get your vehicle charged by just parking it on parking spot or by parking at your garage or even while driving you can charge your electric vehicle. As of now, we are very much familiar with wireless transmission of data, audio and video signals so why can’t we transfer power over the Air.
Presentation to the ASME Rail Transportation Division Fall Technical Conference in Roanoke, VA on October 12, 2010. Paper available from ASME www.asme.org #RTDF2010-42009.
Ultracapacitors can be defined as a energy storage device that stores energy electrostatically by polarizing an electrolytic solution.
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Magnetic levitation is a highly advanced technology which uses the principle of Electromagnetic suspension & Electrodynamics suspension technology. It has various uses, The common point in all applications is the lack of contact and no friction. This increases efficiency, reduces maintenance costs, and increases the useful life of the system. Magnetic levitation is a technique to suspend an object without any support other than that of a magnetic field. There are already many countries that are attracted to maglev system. Many system have been proposed in different parts of the worlds. Maglev can be conveniently considered as a solution for the future needs of the world. This contribution deals with magnetic levitation. An overview of types, principles and working of magnetic levitation is given with the example by train are presented.
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Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
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Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
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Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
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Fundamentals of Electric Drives and its applications.pptx
Eddy current brakes
1. PRESENTED BY:-
NAME- RAHUL KUMAR
ROLL NO:- 125069
REGD NO:- 1201211280
GUIDED BY:-
ER.DEBASHISH MISHRA
ASST. PROFESSOR
DEPARTMENT OF
ELECTRICAL ENGG.
2. Contents :~
Introduction of eddy current
Introduction of eddy current brake
Circular eddy current brake
Linear eddy current brake
How eddy current brake works?
Advantages
Disadvantages
Applications
Future Aspects
conclusion
3. Eddy current is the swirling
current produced in a
conductor which is
subjected to change in
magnetic field.
Because of the tendency of
the eddy current to
oppose,it causes energy to
be lost.
More accurately it converts
more useful energy, such
as kinetic energy in to heat.
Practically its not desirable
4. EDDY CURRENT BRAKING….
These are simple magnetic
devices that consists of non
ferromagnetic conductor that
moves through a magnetic
field.
An example is shown in fig.
where magnetic field is
created in the gap of a
torroidal magnet with
diameter =D
When a conductive disc rotates
eddy current is induced at a
average distance R from axis
of rotation.
Poles magnetic field moves
as a function of angular
velocity of the disc,
5. Contd……
Power is dissipated in the disc by the
joules effect which causes a viscous like
torque applied to disc….
6. Principle of operation…
It works according to faraday’s law of
electromagnetic induction
According to this law when ever a conductor
cuts magnetic lines of forces a emf is induced in
it…..
emf. magnitude α strength of magnetic field
α speed of the conductor
If the conductor is a disc then it will be a
circulatory current i.e. eddy current in the disc.
7. Contd….
According to lenz’s law the direction of
current is in such a way that it opposes
the very cause producing it i.e
movement of the disc..
Since wheels are directly coupled to
discs, thus producing smooth braking.
Key equation: induced emf = -N dϕ/dt
8. Theoretical foundation…..
If the rotating metallic disc is subjected to magnetic field
present in the gap of the electromagnet.
Eddy current appear inside the disc and breaks its rotation
the approximate expression for the power dissipated by
eddy current is…..
B = steady electric field
V= velocity of the disc
induced electric field (E) = V×B
replacing B by excitation current “Iex” in the coils of
electromagnet, we have
E α ωIex
where, ω = angular velocity of the disc
Power dissipated in the disc is proportional to the square of
emf and to the inverse of electrical resistivity.
9. circular eddy current
brake system
Electromagnetic brakes are similar to electrical
motors;
non-ferromagnetic metal discs (rotors) are connected
to a rotating coil, and a magnetic field between the
rotor and the coil creates a resistance used to
generate electricity or heat.
When electromagnets are used, control of the braking
action is made possible by varying the strength of the
magnetic field.
A braking force is possible when electric current is
passed through the electromagnets.
The movement of the metal through the magnetic field
of the electromagnets creates eddy currents in the
discs.
10. Braking time of the disc…..
Time is necessary for the
disc to completely stop
from initial angular speed.it
can be measured as a
function of excitation
intensity.
Larger excitation intensity
makes braking time
shorter as a result of more
powerful eddy currents.
11. These eddy currents generate an opposing magnetic field (Lenz's
law), which then resists the rotation of the discs, providing braking
force.
The net result is to convert the motion of the rotors into heat in the
rotors.
Japanese Shinkansen trains had employed circular eddy current
brake system on trailer cars since 100 Series Shinkansen.
12. LINEAR EDDY CURRENT
BRAKE
The principle of the linear eddy current brake has been described
by the French physicist Foucault.
The linear eddy current brake consists of a magnetic yoke with
electrical coils positioned along the rail, which are being
magnetized alternating as south and north magnetic poles.
This magnet does not touch the rail, as with the magnetic brake,
but is held at a constant small distance from the rail
(approximately seven mm).
When the magnet is moved along the rail, it generates a non-
stationary magnetic field in the head of the rail, which then
generates electrical tension (Faraday's induction law), and causes
eddy currents.
These disturb the magnetic field in such a way that the magnetic
force is diverted to the opposite of the direction of the movement,
thus creating a horizontal force component, which works against
the movement of the magnet.
13. The braking energy of the vehicle is converted in eddy current losses which
lead to a warming of the rail. (The regular magnetic brake, in wide use in
railways, exerts its braking force by friction with the rail, which also creates
heat.)
The eddy current brake does not have any mechanical contact with the rail, and
thus no wear, and creates no noise or odor.
The eddy current brake is unusable at low speeds, but can be used at high
speeds both for emergency braking and for regular braking.
The first train in commercial circulation to use such a braking system has been
the ICE 3.
Modern roller coasters also use this type of braking, but in order to avoid the
risk of potential power outages, they utilize permanent magnets instead of
electromagnets , thus not requiring any power supply.
16. ADVANTAGES:~
Independent of wheel/rail adhesion.
No contact, therefore no wear or tear.
No noise or smell.
Adjustable brake force.
High brake forces at high speeds.
Used also as service brake.
It uses electromagnetic force and not friction
Non-mechanical (no moving parts, no friction)
Can be activated at will via electrical signal
Low maintenance
Light weight
17. DISADVANTAGES:-~
Braking force diminishes as speed
diminishes with no ability to hold the load
in position at standstill.
It can not be used at low speed vehicles or
vehicle running at low speed.
ECB is used with ordinary mechanical
brakes.
Nowadays ECB is using only for safety
purpose.
18. Applications:~
It is used as a stopping mechanism in
trains.
It is also used in the smooth braking and
functioning of roller coasters and such fast
moving machines.
19. FUTURE ASPECT:-~
In future ordinary brakes will be replaced
by the ECB completely.
By the use of ECB in future we can
control high speed train completely.
By some new invention of extra
mechanism we can use ECB for slow
speed vehicles also.
20. CONCLUSION;~
ECB is a good invention for the speed
control of high speed vehicles
We can control the speed of high speed
vehicles without wear and tear in parts
of it.
Drawback of ordinary mechanical
braking system can be overcome by
application of ECB.
It makes use of opposing tendency
of eddy current.