The exterior of braking three phase asynchronous and mounting dimensions, insulting class, protection class, cooling method, structure and installation type, running conditions, rated voltage, rated frequency etc., are the same as DC electromagnetic brake that has additional disc. They are applied to all kinds of machinery that requires quick stop and accurate positioning, and repeated operation. It is totally enclosed and fan cooled squirrel three phase asynchronous motor that has the additional disc DC brake, it has the advantages like quick braking, simple structure, high reliability, high commonality etc.,. Besides, the brake has artificial release structure, and is widely used to many kinds of machinery devices and wheelwork that require quick stop and precise positioning.