An outer-rotor motor comprising: a bearing seat including a chamber (S), an engagement face , an assembly hole and a shaft hole , wherein the assembly hole and the shaft hole intercommunicate with the chamber (S); a stator ; at least one bearing received in the chamber (S); and a shaft extending through the shaft hole and the at least one bearing , wherein the bearing seat has a slit which is adjustable, wherein the shaft includes at least one abutment portion , and wherein the at least one bearing abuts the at least one abutment portion , wherein the outer-rotor motor further comprising a rotor engaged with the engagement face , wherein the rotor includes a housing accommodating the stator , the outer-rotor motor further comprising a cover coupled with the bearing seat , wherein the at least one bearing includes a first bearing relatively distant to the cover and a second bearing relatively adjacent to the cover , wherein each of the first and second bearings includes an inner race and an outer race and a plurality of balls , and wherein an elastic member is disposed between the cover and the outer race of the second bearing , wherein the bearing seat has a horizontal through-hole extending through the slit , wherein a positioning member extends through the horizontal through-hole to adjust the slit , wherein the horizontal through-hole is radially aligned with one of the at least one bearing , wherein the positioning member is configured to be loosened for the elastic member to adjust the pressure the outer race exerts on the inner race , and the outer race is misaligned with the inner race to permit the balls to firmly connect to the inner race and the outer race , and the positioning member is configured to be tightened up to permit the bearing seat to properly clamp the at least one bearing . a bearing seat including a chamber (S), an engagement face , an assembly hole and a shaft hole , wherein the assembly hole and the shaft hole intercommunicate with the chamber (S); a stator ; at least one bearing received in the chamber (S); and a shaft extending through the shaft hole and the at least one bearing , wherein the bearing seat has a slit which is adjustable, wherein the shaft includes at least one abutment portion , and wherein the at least one bearing abuts the at least one abutment portion , wherein the outer-rotor motor further comprising a rotor engaged with the engagement face , wherein the rotor includes a housing accommodating the stator , the outer-rotor motor further comprising a cover coupled with the bearing seat , wherein the at least one bearing includes a first bearing relatively distant to the cover and a second bearing relatively adjacent to the cover , wherein each of the first and second bearings includes an inner race and an outer race and a plurality of balls , and wherein an elastic member is disposed between the cover and the outer race of the second bearing , wherein the bearing seat has a horizontal through-hole extending through the slit , wherein a positioning member extends through the horizontal through-hole to adjust the slit , wherein the horizontal through-hole is radially aligned with one of the at least one bearing , wherein the positioning member is configured to be loosened for the elastic member to adjust the pressure the outer race exerts on the inner race , and the outer race is misaligned with the inner race to permit the balls to firmly connect to the inner race and the outer race , and the positioning member is configured to be tightened up to permit the bearing seat to properly clamp the at least one bearing . <EOS>