Friction disk and brake

A brake comprising:

• a friction disk comprising an elastic component and a plurality of friction monomers, the plurality of friction monomers being distributed in an annular array and enclosed to form a central space, each of the plurality of friction monomers being movable towards or away from the central space along a radial direction of the annular array, the elastic component being connected with the plurality of friction monomers, respectively, and the elastic component being configured with a pre-tightening force to make the plurality of friction monomers close to the central space;
• 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, an opening of the second mounting space facing a second shaft end of the magnetic yoke iron core, the magnetic yoke iron core further comprising at least one third mounting space coaxially arranged with the second mounting space, and an opening of each one of the at least one third mounting space facing the second shaft end of the magnetic yoke iron core;
• a first 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, and the friction disk being located in the first mounting space and being located at a side of the first movable plate close to the second shaft end;
• a first coil arranged in the second mounting space;
• at least one second coil correspondingly arranged in the at least one third mounting space;
• an armature located at the second shaft end of the magnetic yoke iron core, the armature being connected with the first 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 first 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.