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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, the drag force in an eddy current brake 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 an electromagnet 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. ==How it works== An eddy current brake consists of a conductive piece of metal, either a straight bar or a disk, which moves through the magnetic field of a magnet, either a permanent magnet or an electromagnet. When it moves past the stationary magnet, the magnet exerts a drag force on the metal which opposes its motion, due to circular electric currents called eddy currents induced in the metal by the magnetic field. See the diagram at right. It shows a metal sheet ''(C)'' moving to the right under a magnet. The magnetic field ''(B, green arrows)'' of the magnet's north pole ''N'' passes down through the sheet. Since the metal is moving, the magnetic flux through sheet is changing. At the part of the sheet under the leading edge of the magnet ''(left side)'' the magnetic field through the sheet is increasing as it gets nearer the magnet. From Faraday's law of induction, this field induces a counterclockwise flow of electric current ''(I, red)'', in the sheet. This is the eddy current. In contrast, at the trailing edge of the magnet ''(right side)'' the magnetic field through the sheet is decreasing, inducing a clockwise eddy current in the sheet. Another way to understand the action is to see that the free charge carriers (electrons) in the metal sheet are moving to the right, so the magnetic field exerts a sideways force on them due to the Lorentz force. Since the velocity ''v'' of the charges is to the right and the magnetic field ''B'' is directed down, from the right hand rule the Lorentz force on positive charges ''qv''×''B'' is toward the rear. This causes a current ''I'' toward the rear under the magnet, which circles around through parts of the sheet outside the magnetic field, clockwise to the right and counterclockwise to the left, to the front of the magnet again. The mobile charge carriers in the metal, the electrons, actually have a negative charge, so their motion is opposite in direction to the conventional current shown. Each of these circular currents creates a counter magnetic field (''blue arrows''), which due to Lenz's law opposes the change in magnetic field, causing the drag force on the sheet. At the leading edge of the magnet ''(left side)'' by the right hand rule the counterclockwise current creates a magnetic field pointed up, opposing the magnet's field, causing a repulsive force between the sheet and the leading edge of the magnet. In contrast, at the trailing edge ''(right side)'', the clockwise current causes a magnetic field pointed down, in the same direction as the magnet's field, creating an attractive force between the sheet and the trailing edge of the magnet. Both of these forces oppose the motion of the sheet. The kinetic energy which is consumed overcoming this drag force is dissipated as heat by the currents flowing through the resistance of the metal, so the metal gets warm under the magnet. The braking force of an eddy current brake is exactly proportional to the velocity ''V'', so it acts similar to viscous friction in a liquid. When the conductive sheet is stationary, the magnetic field through each part of it is constant, not changing with time, so no eddy currents are induced, and there is no force between the magnet and the conductor. Thus an eddy current brake has no holding force. Eddy current brakes come in two geometries: *In a ''linear'' eddy current brake, the conductive piece is a straight rail or track that the magnet moves along. *In a ''circular'', ''disk'' or ''rotary'' eddy current brake, the conductor is a flat disk rotor that turns between the poles of the magnet. The physical working principle is the same for both. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「eddy current brake」の詳細全文を読む スポンサード リンク
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