The invention provides a brake. The brake comprises a magnetic yoke, multiple windings arranged in the magnetic yoke, a gag bit capable of moving in the axis direction of the magnetic yoke and absorbed by the electrified windings, and a control structure arranged between the windings and a power supply for connecting or disconnecting the windings and the power supply, wherein after the gag bit is absorbed, part of the windings are selectively cut off, and the electrified windings continuously absorb the gag bit. The brake effectively solves the problem of high energy consumption after absorption of the gag bit of a brake in the prior art.