In order to improve the safety, reliability and leveling accuracy of the elevator, a brake must be installed on the elevator. When the electricity or control circuit power fails, the brake should act automatically to brake the elevator. An electromagnetic DC brake as shown in Figure is generally installed on the elevator traction machine. This brake is mainly composed of DC brake coil, electromagnet core, brake shoe, brake shoe frame, brake disc), brake spring and so on.

1-Coil 2-Solenoid core 3-Adjusting nut 4-Brake shoe frame 5-Brake wheel 6-Brake shoe 7-Brake skin 8-Brake spring

The brake must be provided with two sets of independent brake mechanisms, that is, two iron cores, two sets of brake arms, and two brake springs. If one group of brake mechanisms fails, the other group should be able to effectively stop the elevator. The geared traction machine adopts a coupling with a brake wheel (disc), which is generally installed between the motor and the reducer. The brake disc of the gearless traction machine) and the traction sheave are cast as one, and are directly installed on the traction motor shaft.

For the brake wheel diameter, brake shoe width and arc angle of the electromagnetic brake, please refer to Table. brakes are elevators It is one of the main safety facilities of the mechanical system, and directly affects the ride comfort and leveling accuracy of the elevator. During the running of the elevator, according to the comfort of the elevator ride and the leveling accuracy, the brake can be properly adjusted to release the brake,the time of holding the brake and the magnitude of the braking torque when leveling.

In order to reduce the noise generated when the brake is locked and released, the gap between the two iron cores in the brake coil should not be too large. The smaller the gap between the brake shoe and the brake wheel, the better. Generally, it is better that the brake shoe does not rub against the running brake wheel after the brake is released.