Brake device for elevator system and a test method thereof

A brake device for an elevator system, comprising:

• a fixed member;
• a moving member that is movable between a retracted position and a braking position so as to realize switching of the moving member between an attracting state and a braking state, respectively;
• an elastic member, disposed between the moving member and the fixed member, for providing a spring force tending to push the moving member toward the braking position;
• a coil configured to produce an electromagnetic force tending to drive the moving member to move toward the retracted position when energized;
• and
• a controller configured to control a magnitude of the electromagnetic force produced by the coil to change in a process of testing the spring force of the elastic member, and to acquire information of the corresponding electrical signal for controlling the magnitude of the electromagnetic force when the moving member switches from the attracting state to the braking state so as to evaluate the spring force being tested;
• wherein the electrical signal is represented as a pulse width modulation voltage signal, the information of the electrical signal including voltage magnitude information corresponding to a duty cycle of the pulse width modulation voltage signal.