Method for detecting status of a brake, corresponding system, brake for elevator, and elevator system

A system for detecting the state of a brake, in which the brake comprises a braking component, a braking coil and an elastic component connected to the braking component, the system comprising:

• a memory for storing instructions;
• a current collection module for collecting the current of the braking coil;
• a controller configured to execute instructions stored in the memory to:
• adjust the current in the braking coil, so that the braking component of the brake moves away from the first position to the second position;
• enable the current collection module to collect a first current in the braking coil when the braking component leaves the first position;
• based on the first current, determine a first electromagnetic force according to a preset relationship model;
• calculate a second electromagnetic force based on the first electromagnetic force;
• adjust the current in the braking coil to cause the braking component to leave the second position, when the braking component is in the second position;
• enable the current collection module to collect a second current in the braking coil when the braking component leaves the second position;
• and
• based on the second electromagnetic force and the second current, determine a corresponding gap according to the preset relationship model;
• wherein the first position and the second position are different positions where the braking component is located when the energized braking coil and the elastic component jointly act on the braking component.