A solenoid brake is an electrically controlled
brake
A brake is a mechanical device that inhibits motion by absorbing energy from a moving system. It is used for slowing or stopping a moving vehicle, wheel, axle, or to prevent its motion, most often accomplished by means of friction.
Background ...
. The brake is turned on and off by an electrical
solenoid
upright=1.20, An illustration of a solenoid
upright=1.20, Magnetic field created by a seven-loop solenoid (cross-sectional view) described using field lines
A solenoid () is a type of electromagnet formed by a helix, helical coil of wire whose ...
. Typically a spring engages the brake when unpowered, and the solenoid releases it when powered.
These are used along with a mechanical brake to manage the load on a cargo
winch
A winch is a mechanical device that is used to pull in (wind up) or let out (wind out) or otherwise adjust the tension of a rope or wire rope (also called "cable" or "wire cable").
In its simplest form, it consists of a spool (or drum) attache ...
. They're also used in electric wheel chairs, hoists, printers, photocopiers, etc.
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Brakes