Electromagnetic brakes slow down or stop a moving machine by using an electromagnetic force to apply friction to its wheels. These brakes receive the electromagnetic force they require from a magnetic field comprised of a magnetic coil and a coil shell that is bolted to the machine frame.Continue Reading
A typical electromagnetic brake has three elements in its construction – a magnetic field comprising of a coil and a shell, an armature and the hub. When the brakes are applied, the armature is attracted to the magnetic field developed by the coil.
Simultaneously, a torque working in the opposite direction is transferred into the field to counteract the effect of the magnetic field. As the strength of the field falls, the vehicle begins to slow down and eventually stops. The disengagement process begins as soon as the vehicle stops. As the magnetic flux degrades rapidly, the armature is brought to its initial position ready to work again. This process is quite rapid and usually takes less than three seconds to complete. The smooth working of the coil is crucial to the effective functioning of the electromagnetic brake as it produces the magnetic field. The whole assembly has to be protected against extremes of temperature as well as wear and tear, as both these factors are detrimental to the functioning of the brakes.
Electromagnetic brakes are now used in airplane braking systems in addition to extensive use in train and tram braking systems.Learn more about Brakes
For most passenger cars, the use of disc brakes on all four wheels is generally considered the optimum configuration according to the automotive website Edmunds. However, drum brakes are still commonly used on many cars on one or both axles due to manufacturing and pricing concerns.Full Answer >
Car brakes overheat for various reasons, including as a result of riding the brake and applying excessive force to or overusing the brakes. When brakes overheat on a regular basis, hardened spots can develop on the brake drums or the rotors. These "hot spots" resist friction, causing brake failure.Full Answer >
Hydro-boost brakes work by applying hydraulic pressure from the power steering system to assist in braking. When the brakes are applied, hydraulic fluid flows from the power steering pump to increase braking effort, while fluid also flows from the hydro-boost system to the steering gear to assist in power steering.Full Answer >
Drum brakes work by pressing brake shoes against the inside of a drum-shaped cylinder attached to the wheel of the vehicle. The friction produced by this contact slows the wheel, slowing down the vehicle. Drum brakes are most common on older vehicles. On newer vehicles, they are often attached to only the rear wheels, and more-efficient disc brakes slow the front wheels.Full Answer >