A DC brushless motor, comprising: a) a shaft ; b) a stator assembly ; c) two end covers , each end cover comprising a side wall, a plurality of through holes , and a bearing ; d) a housing , the housing comprising: an inner wall, and two ends; e) a plurality of permanent magnets ; and f) a plurality of screws ; wherein: the shaft is connected with the stator assembly ; the stator assembly is arranged inside the housing ; the permanent magnets are positioned outside the stator assembly on the inner wall of the housing ; each end cover is disposed on one end of the housing ; and the shaft is disposed on the bearing of each end cover ; characterized in that: each screw extends through one through hole of one end cover and is screwed into the housing ; a plurality of gaps is arranged in an axial direction on the side wall of each end cover outside one of the plurality of through holes ; a recess in a ring shape is arranged on the side wall of each end cover ; the plurality of gaps on each end cover is in communication with the recess ; an end of the inner wall of the housing is convex to form a fixture block ; the fixture block is inserted into the recess on one end cover through one of the plurality of gaps ; an end surface of one end cover is provided with a plurality of clay recesses for correcting a dynamic balance; and a mounting bracket is arranged outside the housing . a) a shaft ; b) a stator assembly ; c) two end covers , each end cover comprising a side wall, a plurality of through holes , and a bearing ; d) a housing , the housing comprising: an inner wall, and two ends; e) a plurality of permanent magnets ; and f) a plurality of screws ; the shaft is connected with the stator assembly ; the stator assembly is arranged inside the housing ; the permanent magnets are positioned outside the stator assembly on the inner wall of the housing ; each end cover is disposed on one end of the housing ; and the shaft is disposed on the bearing of each end cover ; characterized in that: each screw extends through one through hole of one end cover and is screwed into the housing ; a plurality of gaps is arranged in an axial direction on the side wall of each end cover outside one of the plurality of through holes ; a recess in a ring shape is arranged on the side wall of each end cover ; the plurality of gaps on each end cover is in communication with the recess ; an end of the inner wall of the housing is convex to form a fixture block ; the fixture block is inserted into the recess on one end cover through one of the plurality of gaps ; an end surface of one end cover is provided with a plurality of clay recesses for correcting a dynamic balance; and a mounting bracket is arranged outside the housing . each screw extends through one through hole of one end cover and is screwed into the housing ; a plurality of gaps is arranged in an axial direction on the side wall of each end cover outside one of the plurality of through holes ; a recess in a ring shape is arranged on the side wall of each end cover ; the plurality of gaps on each end cover is in communication with the recess ; an end of the inner wall of the housing is convex to form a fixture block ; the fixture block is inserted into the recess on one end cover through one of the plurality of gaps ; an end surface of one end cover is provided with a plurality of clay recesses for correcting a dynamic balance; and a mounting bracket is arranged outside the housing . <EOS>