A mechanical part that stops or slows down a moving part in a machine. Commonly known as brake pads and brake pads. The brake is mainly composed of a brake frame, brake parts and operating devices. Some brakes are also equipped with an automatic adjustment for clearance adjustment. In order to reduce the braking torque and reduce the size of the structure, the brake is usually installed on the high-speed shaft of the equipment, but the brake should be installed on large equipment with high safety requirements, such as mine hoists, elevators, etc. The speed shaft is close to the working part of the device. Some brakes have been standardized and serialized and are manufactured in specialized factories for selection.

The electromagnetic brake is mainly matched to the series motor. It is widely used in metallurgy, construction, chemical industry, food, machine tools, stage, elevators, ships, packaging and other machinery, as well as brakes in case of power failure (hazard prevention). The drag torque that must be applied in order to stop or decelerate a mechanically moving part is called braking torque. Brake torque is the basis for brake design and selection, and its size is determined by the type of machinery and the requirements of the job. The performance of the friction material (brake components) used on the brake directly affects the braking process, and the main factors affecting its performance are the operating temperature and heating speed. The friction material should have a high and stable coefficient of friction and good wear resistance. There are two types of friction materials: metallic and non-metallic. The former usually uses cast iron, steel, bronze and powder metallurgy friction materials, the latter is leather, rubber, wood and asbestos.