Brake

A brake comprising:

• a magnetic yoke iron core comprising a first mounting space and a second mounting space distributed sequentially and concentrically from inside to outside of the magnetic yoke iron core, the first mounting space penetrating through a center position of the magnetic yoke iron core in an axial direction of the magnetic yoke iron core, and an opening of the second mounting space facing a second shaft end of the magnetic yoke iron core;
• a movable plate located in the first mounting space and close to a first shaft end of the magnetic yoke iron core, the first shaft end being an opposite end of the second shaft end;
• a friction disk arranged in the first mounting space and located at a side of the movable plate close to the second shaft end;
• a coil arranged in the second mounting space;
• an armature located at the second shaft end of the magnetic yoke iron core, the armature being connected with the movable plate through at least one connector, the at least one connector passing through the magnetic yoke iron core and being slidably matched with the magnetic yoke iron core, and the armature being configured to drive the movable plate to move along the axial direction of the magnetic yoke iron core;
• and
• an elastic part arranged between the armature and the magnetic yoke iron core, the elastic part having a pre-tightening force that enables the armature to be far away from the magnetic yoke iron core;
• and
• wherein an overall thickness of the brake depends on a thickness of the magnetic yoke iron core and a thickness of the armature.