Wear monitoring system, motor and elevator

A wear monitoring system for a brake device of a motor, the brake device comprising a fixed brake disc and a brake magnet, wherein the brake magnet is movable relative to the brake disc to switch between an attracted state in which the brake magnet is attracted to the brake disc and a separated state in which the brake magnet is separated from the brake disc,

• wherein the wear monitoring system comprises:
• a fixedly arranged support;
• a first arm portion including a first free end and arranged to be moved with the brake magnet so that the first free end always contacts the bottom of the brake magnet,
• a second arm portion arranged to be moved with the first arm portion and including a second free end,
• a trigger device comprising a trigger button which is set to be triggered by the second free end of the second arm portion when the wear amount of the brake magnet reaches a first threshold or a multiple of the first threshold and is smaller than a second threshold larger than the first threshold, and when the brake magnet and the brake disc are in the attracted state.