The stator and rotor of Y2EJ series (IP*4) electromagnetic brake three-phase asynchronous motor are general use of Y2 series, the attached electromagnetic iron can be excited by direct current. While connect the three phase power source, the electromagnetic iron can get energy and occur the magnetic attraction to attract the armature so as to separate the friction surface of disk brake from the static frictionsub-phase and then rotate under the action of magnetic torque, when cut off the electricity, the magnetic iron will also out of power and the attraction of magnet will also loss, then under the perssure of brake spring, the armature will contact the disk brake and occur the friction torque and in the final stop the motor. To change the stator position after the stop of motor, we can realize the motor stop by releasing device, the proced ure is to rotate release screw. Two special sliding blocks and make the mutual displacement so as to separate the disk brake from the static friction sub-phase.