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Electromagnetic brakes or EM brakes are used to slow or stop vehicles using electromagnetic force to apply mechanical resistance (friction). They were originally called electro-mechanical brakes but over the years the name changed to "electromagnetic brakes", referring to their actuation method which is generally unrelated to modern electro-mechanical brakes.
There are three parts to an electromagnetic brake: field, armature, and hub (which is the input on a brake) (A-3). Usually the magnetic field is bolted to the machine frame (or uses a torque arm that can handle the torque of the brake).
Disk electromagnetic brakes are used on vehicles such as trains, and power tools such as circular saws, to stop the blade quickly when the power is turned off.A disk eddy current brake consists of a conductive non-ferromagnetic metal disc attached to the axle of the vehicle's wheel, with an electromagnet located with its poles on each side of the disk, so the magnetic field passes through the ...
Eddy current brakes use the drag force created by eddy currents as a brake to slow or stop moving objects. Since there is no contact with a brake shoe or drum, there is no mechanical wear. However, an eddy current brake cannot provide a "holding" torque and so may be used in combination with mechanical brakes, for example, on overhead cranes.
Articles about mechanical clutches and brakes that work on the property of electromagnetism Pages in category "Electromagnetic brakes and clutches" The following 5 pages are in this category, out of 5 total.
The force applied on the brake shoes is counteracted by one of the reactor springs (which one depends on the direction of the rotation) so that when the current through the electromagnet is withdrawn the spring ensures that the actuating arm is returned to its resting position and the brake shoes are retracted from the drum.
The truck of a SEPTA Kawasaki light rail vehicle showing the track brake magnets between the wheels. A magnetic track brake (Mg brake) is a brake for rail vehicles. It consists of brake magnets, pole shoes, a suspension, a power transmission and, in the case of mainline railroads, a track rod. When current flows through the magnet coil, the ...
Electromagnetic brakes are likewise often used where an electric motor is already part of the machinery. For example, many hybrid gasoline/electric vehicles use the electric motor as a generator to charge electric batteries and also as a regenerative brake. Some diesel/electric railroad locomotives use the electric motors to generate ...