Servo brake

The utility model discloses a servo brake which comprises a coil body shell, and a coil is wound on the coil body shell. The motor further comprises an armature plate, the armature plate is arranged at the end, opposite to a rotor of the motor, of the coil body shell in parallel relative to the end face of the coil body shell and moves in the direction away from the coil body shell in the axial direction of the coil body shell under the action of electromagnetic force, and the bottom plate is arranged on the side, away from the coil body shell, of the armature plate in parallel. The armature plate and the bottom plate are connected together in a relative sliding mode in the direction perpendicular to the working face of the armature plate. The brake pad is placed in the gap between the armature plate and the bottom plate in the direction parallel to the working surface of the armature plate; the part of the bottom plate except the area connected with the armature plate is cut off; in the axial direction of th