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. View and download powerpoint presentations on speed control of a dc shunt motor ppt. Kv rrl jorhat, assam 2 1 magnetic field and field lines. Highaltitude nuclear detonations and electromagnetic bombs can generate emp that. Magnetic braking system mechanical technical presentation. The power engineer should be aware of the effects of emp on his transmission and distribution system, and the power users must protect their equipment from the pulse conducted into their facilities on the power lines.
If ultrareliable electromagnetic braking of 600 tonne vehicles hasnt convinced you then surely this last example will. Magnetic braking can also find applications in roller coasters and railroad trains, in which the metallic conductor has the shape of a linear rail. Short duration is defined as a time interval comparable to the duration of transient processes in electric circuits. Dec 04, 2011 the magnetic braking functions based on law of lenz and induced currents. Now coming to the term or question what is braking. Electromagnetic braking system group 14 slideshare. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Presentation on regenerative brake authorstream presentation. Then an electron of charge in the metal moving counterclockwise with velocity will experience a lorentz force, where is the magnetic induction inside the metallic disk. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Automobiles need high degree of safety to protect the occupants and their property.
Therefore, the magnetic flux density computed by the developed fem model can be applied during the design stage of magnetic braking systems. When we compared with normal brake it takes time to make the vehicle to stop it, but if we used electro magnetic brake we can stop the vehicle immediately when we applied. The magnetic transmitter is in the form of a transmit coil with a varying electric current. Electro magnetic braking is now taking a good pace in the applications on the day to day stuffs like cars, machine stopper and as motion retarder as well. Electric braking system how to make electrical braking project types of brakingcircuit gallery duration. Compressed air brake pneumatic brake magnetic brake. Explore eddy current brakes with free download of seminar report and ppt in pdf and doc format. Oldakowski, bedford, ohio a magnetic brake provides braking or locking capability and is remotely controlled by electric power. Among other works carried out 5, design of a magnetic braking system was proposed to design the braking systems to improve the shortcomings of the conventional braking systems.
A new electric braking system is proposed for a brushless dc bldc motor. When the plate enters the magnetic field, an electric field is induced in metal and circulating eddy currents are generated. On comparing the metal plate with pendulum, its speed reduces on going through among magnetic poles. In general in all type of motion, there is always some amount of resistance which retard the motion and is sufficient to bring the body rest. In this paper the basic of magnetic braking are introduced. A brake is an appliance used to apply frictional resistance to moving body to stop or retard it by absorbing its kinetic energy. Electromagnetism is the property of its rightful owner. We know that brake is an equipment to reduce the speed of any moving or rotating equipment, like vehicles, locomotives. The results will facilitate the design of magnetic braking systems. The resulting eddy currents interact with the magnetic flux to produce lorentz forces and subsequently a braking torque.
When the driver applies force on the brake pedal the magnitude is sensed by the pressure transducer which in turn sends the actuating signals to microprocessor. An electromagnetic braking system is a new concept. Each of the cores is wound with a coil, thus forming an electric magnet. S4, s6 is operated in pulse width modulation pwm switching mode at each. The magnet is lifted and dragged forcibly on the dipole of magnet on a nonmagnetic plane depending on equations of maxwell. This project is a new technology of braking system. An eddy current brake, also known as an induction brake, electric brake or electric retarder, is a. Electromagnetic braking system magnetic braking system. This energy is saved in a storage battery and used later to power the motor whenever the car is in electric mode. With this theory magnetic braking on copper rectangular sheet moving linearly through the magnet is explained. Magnetic brakes are noncontact brakes that use magnetic fields to actuate the braking components. The main criteria for regenerative braking is that the rotor has to rotate at a speed higher than. Referring to the graphic, the sequence of events in magnetic braking can be described as follows.
Electromagnetic braking is now taking a good pace in the applications on the day to day stuffs like cars, machine stopper and as motion retarder as well. Magnetic braking system seminar reportpdf ppt download abstract. When a motor is in moving state, it has some kinetic energy stored in it. This principle is used to make the friction less braking. In regenerative braking the electric motor is reversed so that, instead of using electricity to turns the wheels, the rotating wheels turns the motor and create electricity.
Electric and magnetic field simulation for solidworks and. In the last few years, the magnetic braking has become very popular. In order to accomplish this study and prove the applicability of the system it was. The absolute value of the rotation angle is output. Whereas the electric taxi aircraft is already a solution tested and expected to be a reality in the coming years, the study on the feasibility of an electromagnetic braking system for aircraft arises. Electromagnetic antilock braking for electric vehicles. In an eddy current brake the magnetic field may be created by a permanent. If plate is in the file of magnet then electric field gets induced in the metal and hence producing currents. Each magnetic pulse created by pemf therapy animates a minor electrical flag in the cells of the body. While some magnet problems will be apparent upon visual inspection, there may also be electrical problems that can impact performance. The magnetic brake comprises a rotatable shaft and a brake disc mounted on the shaft. Strictly speaking this is magnetic braking as the source is permanent magnets, yet it is based on the same eddy current principle and is just as impressive drop tower amusement park rides feature up to 400 feet 120 m towers with a carriage capable of taking up to 40.
Secondly, a magnetic drag force and a magnetic lift force on a magnetic dipole moving over a nonmagnetic conducting plane are explained. Firstly, a simple theory is proposed using faradays law and the lorentz force. Find powerpoint presentations and slides using the power of, find free presentations research about speed control of a dc shunt motor ppt. Electrical brakes electric brakes are actuator devices that use an electrical current or magnetic actuating force to slow or stop the motion of a rotating vehicle. Strictly speaking this is magnetic braking as the source is permanent magnets, yet it is based on the same eddy current principle and is just as impressive. Electric pulse magnetic braking using mechatronics iniguez j, raposo v, hernandezlopez a, flores a g and zazo m, study of the conductivity of a metallic tube by analysing the damped fall of a magnet eur. Magnetic braking system seminar reportpdfppt download. The contents of this handbook draw heavily on the results of research conducted at stanford research institute. Displaying electromagnetic breaking system powerpoint presentations ksrm college of engineering ppt presentation summary. Working principle the working principle of the electro magnetic brake is based on the creation of magnetic field with in a metal disc rotating. An electromagnetic braking system uses magnetic force to engage the brake, but the power required for braking is transmitted manually.
The electromagnetic braking system are also called electromechanically brake. The verification shows the predicted magnetic flux is within acceptable range with the measured value. The functional different between clutch and a brakes is that a clutch connects two moving members of a machine. Bearing this in senses we come up with a new concept of electric pulse magnetic braking e. High speed trains have acdc engines, for which the principles of electric braking can be applied. Jan 08, 2015 this principle is used to make the friction less braking. To solve these problems, a contactless magnetic brake has been developed. Electromagnetic pulse handbook for electric power systems.
A faulty brake magnet can severely impact the stopping power of a trailer. 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 magnetic braking system mechanical technical presentation introduces the magnetic braking with the help of simple theory, law of faraday and lorentz force. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. If you have to stop the motor, then you have to remove or dissipate this energycommonly. A magnetic brake consists of a permanent magnet, which induces currents in a rotating copper disk. The process of applying brakes can be termed as braking. A nonrotating core housing assembly located around the shaft includes a permanent magnet and a bipolar solenoid. Magnetic braking system sevvel p1, nirmal kannan v2, mars mukesh s3 an electromagnetic braking system uses magnetic force to engage the brake, but the power required for braking is transmitted manually.
How to check an electric brake magnet it still runs. Assume the pole of the upper face of the magnet is the north pole. Electric braking system how to make electrical braking project types of braking circuit gallery duration. Chapter magnetic effects of electric current class.
Changing electric field or moving chargescurrent induces a magnetic field. Electric pulse article about electric pulse by the free. Regenerative braking is used on hybrid gas electric automobile regenerative braking is used on hybrid gas electric automobiles to recoup some of the energy lost during stopping. Electromagnetic braking system is new braking system it is used in lmv and hmv like jeep, buses, car, truck, train and motor bikes. Pulse, electric a change of short duration in voltage or in current intensity. Electromagnets with variable magnetism strength can also be used to control the movement. A disk eddy current brake consists of a conductive nonferromagnetic metal disc attached to the axle of the vehicles wheel, with an electromagnet located with its poles on each side of the disk, so the magnetic field passes through the. Winner of the standing ovation award for best powerpoint templates from presentations magazine. First of all we can classify the term braking in two parts. Emp can also be produced from nonnuclear sources, such as electromagnetic bombs, or ebombs. Magnetic braking works because of induced currents and lenzs law. Ppt electric fields powerpoint presentation free to. Apr 19, 2015 when a motor is in moving state, it has some kinetic energy stored in it. Considering the bogie wheel base and the wheel diameter of electric motor train unit, which are 2500 and 860 mm 9, respectively, the longitudinal length of etb.
Design of a magnetic braking system request pdf researchgate. Rather than a conventional contact friction braking, this system are more efficient, quick in the response and has no wear so it has good durability. A parametric analysis of magnetic braking the eddy current. Apr 02, 2016 if ultrareliable electromagnetic braking of 600 tonne vehicles hasnt convinced you then surely this last example will. Electromagnetic braking system consist of solenoid coil which is uses principle of electromagnetic effect of electrical current for braking. It is a versatile electromagnetic design tool as it calculates the magnetic and electric field and flux, electric potential, voltage, current, magnetic force, electric force, torque, eddy current and losses, resistance, inductance, capacitance, skin effect, proximity effect. The electromagnetic brakes can be used in commercial vehicles by controlling the current supplied to produce the magnetic flux. In contrast to conventional friction brakes, there is no direct contact between interacting surfaces, which makes magnetic. Dec 30, 2018 regenerative braking takes place whenever the speed of the motor exceeds the synchronous speed. Secondly, a magnetic drag force and a magnetic lift force on a magnetic dipole moving over a nonmagnetic conducting plane are. Electrical braking system types, requirements, advantages.
The receiver is in the form of a receive coil connected to receive and signal processing electronics. An e1 hemp the first blast of energy from a highaltitude magnetic pulse event could simultaneously within one power cycle create malfunctions of electronic control. Eddy current brakes seminar report, ppt, pdf for electrical. The region around a magnet where the force of attraction or repulsion can be detected is called magnetic field. Regenerative braking is a system in which the electric motor that normally drives a hybrid or pure electric vehicle is essentially operated in reverse electrically during braking or coasting. A compromised brake magnet can lead to weak or surging brakes, or cause the brakes to pull to one side.
Ppt electromagnetism powerpoint presentation free to. In railway wagon as well as in passenger cars the braking system plays a very important role to stop the train, to maintain the speed of the train. Ems is a magnetic and electric field modeling and simulation software. The verification shows the predicted magnetic flux is within 5% difference with the measured value. Friction, heat, conventional braking, and electromagnetic braking etc. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Nov 29, 20 electrical brakes electric brakes are actuator devices that use an electrical current or magnetic actuating force to slow or stop the motion of a rotating vehicle. Not require a returntoorigin operation comparison of encoders general item incremental encoder absolute encoder absolute values output. The battery charger is to convert the electricity from mains to charge the battery 3. This baking method is called regenerative baking because here the motor works as generator and supply itself is given power from the load, i. This is combination of electrical and mechanical components here electrical energy is used to apply braking torque or retardation. A new electric braking system with energy regeneration for a bldc. If you attach a metal plate to the end of a pendulum and let it swing, its speed will greatly decrease when it passes between the poles of a magnet.
1565 1353 1518 6 92 461 927 42 474 1630 32 1076 1499 852 1500 246 562 542 702 832 987 1552 1406 583 216 1098 394 242 707 473 480 895 1173 664 1073 1121