This brake consists of brake armature plate, springs, adjustment housing and cam. It could be used on the external rotors traction machine with brake wheels. This is a kind of device by losing electric power to realize brake. The brake could be installed on the traction machine by the adjustment housing. When current goes through the brake, with the electromagnetic affection, the brake armature disc will be attracted. Springs are compressed. The brake wheels will be released and the traction machine could run freely. When losing electrical power, the electromagnetic disappear. Under the affection of springs, the brake plate will be compressed closely. Finally, machinery brake would be achieved.

This kind of brake has compact and nice cover, safety reliable, and with lower noise. It could be used on variety of traction machines with brake wheels.