What relationship, if any, exists between eddy current. How a brake system works brake systems were designed to slow the vehicles wheel movement through friction. Regional engineering postgraduate conference epc 2011 eddy current braking study for brake disc of aluminium, copper and zink m. An eddy current brake, also known as an induction brake, electric brake or electric retarder, is a device used to slow or stop a moving object by dissipating its. The retarding torque of an eddycurrent brake is calculated as function of the angular velocity of the rotor and of the stator dc magnetizing current. Application of time varying fields in different waveforms. You could use an eddy current brake to provide initial braking at high speeds and supplement that with a friction brake to provide the final braking function. Eddy current brake design for operation with extreme back. Unlike the friction brakes, which apply pressure on two separate objects, eddy current brakes slow an object by creating eddy currents through electromagnetic induction which create resistance, and in turn either heat or electricity. Linear permanent magnet brakes, also known as eddy current brakes, are a fail safe, power free, deceleration system that is used in conjunction with a metal reaction plate. The electromagnetic field components are found in the rotor medium by solving the field equations. Development of an eddy current rail brake derived from.
A wide variety of eddy current brake retarder options are available to you, such as auto testing machine, strength testing machine. Mathematical model was built to calculate the torque of the eddy current brake system and hydraulic brake system and analyze the braking force distribution between two types of brake systems. Firstly, a simple theory is proposed using faradays law and the lorentz force. Scribd is the worlds largest social reading and publishing site. Introduction many of the ordinary brakes, which are being used. We hope to learn the effect of stator spacing, magnet size and shape, number of magnets, magnet radius, and phase angle have on braking force. Free seminar reports, ppt presentation topics and abstract. However professor emanuel has had experience with eddy current brakes before and he has described the possible outcomes for the designed tests.
Traditional electric motors have a tradeoff between high torque and low rotor inertia. A study of eddy current braking system is performed to find out the practical limit of using an electromagnetic braking system. This motoreddy current brake system could be revolutionary and it could help diminish our. Although the operating principles of eddy current brakes are well known, no generalised torquespeed equation that covers the entire speed range in terms of the various machine parameters has yet been produced. Relatively few trains use electromagnetic braking, but this is an exception. Eddy current braking system automobile ieee project topics, design and analysis, thermal engineering base paper ideas, synopsis, abstract, report, figures, full pdf, fabrication, working details for automobile engineering, diploma, btech, be, mtech and msc college students. The eddy current brake retarders help to extend the life span of the regular brakes and keep the regular brakes cool for emergency situation. Eddy currents are electric currents induced in conductors when they exposed to fluctuating magnetic field,due to relative motion of field source and conductor or. If you continue browsing the site, you agree to the use of cookies on this website. A free powerpoint ppt presentation displayed as a flash slide show on id. But it some situations, frictionless brakes can be much more advantageous.
Eddy current brakes seminar report, ppt, pdf for electrical. Ppt hydraulic brakes powerpoint presentation free to. The eddycurrent brake makes no contact with the rail so is not subject to frictional wear and is more powerful, but it sets up strong electromagnetic fields that require reinforced immunization of signaling circuitry. However, unlike friction brakes, in which the drag force that stops the moving object is provided by friction between two surfaces pressed together, the drag force in an eddy current brake is an electromagnetic. This paper introduces an eddy current and electrohydraulic hybrid brake system to solve problems such as wear, thermal failure, and slow response of traditional vehicle brake system. They consist primarily of an input drum, stationary field coil, and a coupling pole assembly that acts. Working of drum brakes drum brakes work on the same principle as the disc brakes. This opposing torque is used to brake the automobiles. Eddy current primarily used in variable speed devices, these clutches and brakes cannot be operated at zero slip. Md16 clutches and brakes university of northern iowa. Electromagnets cast iron core conducting copper wire mounting bolts disc mild steel machined from plates essentially the eddy current brake consists of two parts, a stationary magnetic field system and a solid rotating part, which include a metal disc. In this way, as the load increases over the rear axle. Linear magnetic brakes permanent magnet h2w technologies. Explore eddy current brakes with free download of seminar report and ppt in pdf and doc format.
Eddy current brakes are a damagefree alternative to mechanical brakes in highspeed trains and rollercoasters. Learn more about eddy current brakes and how they are used in the real world. Eddy current brakes free download as powerpoint presentation. This includes excessive maintenance due to the numerous moving parts associated with these packages, as well as the oil involved which can get quite messy and freeze in the winter time. Accurate fe model accounting for the effects of time varying fields on the performance of the ecb. View and download powerpoint presentations on eddy current braking system ppt. Also, where operation of trains so equipped is intensive, there is a. In regard to eddy current braking, which will provide more improvement to braking strength. A brake designed to reinforce the power applied to it, such as a hand brake explanation of selfenergizing brake. Abstract this is an electric braking system which works on the principle that eddy current produced in it opposes the driving torque. Since there is no physical contact, eddy current brakes are much quieter and last much longer before wearing down as compared to frictional brakes. Institute of physics publishing european journal of physics eur. For positive braking you need another type of brake such as friction.
A wide variety of eddy current brake options are available to you, such as auto testing machine, strength testing machine. In this paper the basic of magnetic braking are introduced. An eddy current braking experiment was conducted to study the behaviour of three different materials to be used as brake disc which are aluminium, copper and zink. This information will be used by another team to create an eddy current motor. Seminar on eddy current brake report pdf download abstract this is an electric braking system which works on the principle that eddy current produced in it opposes the driving torque.
Calculate the frictional forces and torque capabilities in brake systems. In this paper, linear halfback magnetized mover is applied to eddy current braking system for high speed. The present dissertation includes an introduction to friction braking, a theory of eddy current braking, analytical and numerical models of the eddycurrent brake. Due to its special mounting location and heat dissipation mechanism, eddy current brakes have better thermal dynamic performance than regular friction brakes. Get disk brake seminar report and ppt in pdf and doc. With this theory magnetic braking on copper rectangular sheet moving linearly through the magnet is explained. Also get the seminar topic paper on disk brake with abstract or synopsis, advantages and disadvantages, presentation slides for ieee final year mechanical engineering me or production automobile students for the year 2016 2017.
For operating this a control switch is provided on the steering column. Introduction of eddy current introduction of eddy current brake circular eddy current brake linear eddy current brake how eddy current brake works. How eddy current braking technology is freeing us from friction. Highlights time varying field application for increased braking torque generation of eddy current brakes. I have visited various facilities who are suffering from the liabilities associated with air over hydraulic braking systems. Magnetic braking system seminar reportpdfppt download. The diagram above shows the working of a circular eddy current brake. Calculate frictional brake horsepower and recognize how to use it.
About 34% of these are testing equipment, 23% are other auto brake system, and 4% are industrial brake. Siow2 1faculty of mechanical engineering universiti malaysia pahang. Eddy current brakes are widely used in high speed trains and roller coasters. Eddy current braking system automobile project topics.
The shoes are pulled away from the drum by the springs when the brakes are released. Understand the principles of heat generation and heat removal from brake systems. Today there are primarily two brake systems, abs and non abs systems anti brake skid one system is basic hydraulics that work with a master brake cylinder which is. Circular eddy current braking system nonferromagnetic metal discs rotors are connected to a rotating coil, and a magnetic field between the rotor and the coil creates a current used to generate electricity which produces heat.
Do eddy currents brakes have any advantages over other. What relationship, if any, exists between eddy current damping and velocity in a simple aluminum track system. Advantages disadvantages applications future aspects conclusion 3. Most of the force in an eddy current brake is due to the fundamental, and if we just consider the fundamental, we can make a simulation in femm that includes motion. Drum brake also has an adjuster mechanism, an emergency brake mechanism and lots of springs. According essentially an eddy current brake consists of two. We want to replace the current sheet by a sinusoidally distributed band of current density. Design of an electrically controlled eddy current brake i abstract keywords. Magnetic braking system seminar report pdf ppt download. Optimization of the braking torque on a generic ecb configuration for automotive applications. A comprehensive approach to determining the speedtorque. Eddy current brake design for operation with extreme.
Eddy current brake design, wouterse, torque, speed, current, eddy current brakes ecb utilise electromagnets to generate smooth braking torque in contrast. Integration of the power flow vector e x h over the rotor surface yields the total retarding power of the brake. Eddy current brake retarder, eddy current brake retarder. Ceramic or rare earth magnets are bonded to a steel back iron plate. Characteristic analysis of the selfexcited eddy current. Real eddy current brakes are a bit more sophisticated than this, but work in essentially the same way. Analysis of eddycurrent and magnetic rail brakes for highspeed. Brake performance analysis of abs for eddy current and. Improved braking torque generation capacity of an eddy. An eddy current brake, also known as an induction brake, electric brake or electric retarder, is a device used to slow or stop a moving object by dissipating its kinetic energy as heat.
The goal of this project is to eliminate using the physics of eddy currents. Clutches and brakes objectives recognize the basic geometries of clutch and brake systems. In real life, eddy currents can be used in transportation systems like monorails or innercity rapid transit cars on rails to generate a stopping force. This limitation is overcome in the present paper that develops a torquespeed equation valid throughout the complete speed range. Characteristic analysis of the selfexcited eddy current brake according to the parameter variations teachul jeong1, sooyoung cho1, jaenam bae2 3, changhee yoo and ju lee1 1hanyang university, 222, wangsimniro, seongdonggu, seoul, korea. Development of an eddy current rail brake derived from linear motor technology yasuaki sakamoto assistant senior researcher, electromagnetic applications, maglev systems technology division eddy current rail brakes characteristically guarantee the generation of a stable braking force that is not affected by the conditions of. Find powerpoint presentations and slides using the power of, find free presentations research about eddy current braking system ppt.