A motor comprising: a housing that includes a bottom portion on which a first bearing accommodating portion is formed and a cylindrical side surface portion which extends from an edge of the bottom portion; a rotor assembly that includes a rotation shaft and a rotor which is mounted on an outer circumferential surface of the rotation shaft and is accommodated in an inside portion of the housing; a stator assembly that is accommodated in an inside portion of the housing and surrounds the rotor; a housing cover that is coupled to an upper end of the housing and on which a second bearing accommodating portion is formed at a central portion thereof; a flow guide that is seated on the upper side of the housing cover; an impeller that is connected to the rotation shaft at an upper side of the flow guide; an impeller cover that covers the impeller; a first bearing that is accommodated in the first bearing accommodating portion and into which one end portion of the rotation shaft is inserted; and a second bearing that is accommodated in the second bearing accommodating portion and into which the other end of the rotation shaft is inserted, wherein the housing cover includes: a cover body on which an opening portion is formed therein; a plurality of connection arms that connect the second bearing accommodating portion and an edge of the opening portion to each other; and a guide rib that extends from the edge of the opening portion, characterised in that the housing cover further includes a plurality of air guide grooves which is recessed from the edge of the opening portion towards an outer edge of the cover body, and wherein the guide rib is formed between adjacent air guide grooves. a housing that includes a bottom portion on which a first bearing accommodating portion is formed and a cylindrical side surface portion which extends from an edge of the bottom portion; a rotor assembly that includes a rotation shaft and a rotor which is mounted on an outer circumferential surface of the rotation shaft and is accommodated in an inside portion of the housing; a stator assembly that is accommodated in an inside portion of the housing and surrounds the rotor; a housing cover that is coupled to an upper end of the housing and on which a second bearing accommodating portion is formed at a central portion thereof; a flow guide that is seated on the upper side of the housing cover; an impeller that is connected to the rotation shaft at an upper side of the flow guide; an impeller cover that covers the impeller; a first bearing that is accommodated in the first bearing accommodating portion and into which one end portion of the rotation shaft is inserted; and a second bearing that is accommodated in the second bearing accommodating portion and into which the other end of the rotation shaft is inserted, wherein the housing cover includes: a cover body on which an opening portion is formed therein; a plurality of connection arms that connect the second bearing accommodating portion and an edge of the opening portion to each other; and a guide rib that extends from the edge of the opening portion, a cover body on which an opening portion is formed therein; a plurality of connection arms that connect the second bearing accommodating portion and an edge of the opening portion to each other; and a guide rib that extends from the edge of the opening portion, characterised in that the housing cover further includes a plurality of air guide grooves which is recessed from the edge of the opening portion towards an outer edge of the cover body, and wherein the guide rib is formed between adjacent air guide grooves.