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; 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 second bearing accommodating portion at a central portion thereof; a plurality of connection arms that connect the second bearing accommodating portion and the cover body; and guide ribs that extend from an edge of the opening portion, wherein the guide ribs extend by a predetermined length in a direction orthogonal to a radial direction of the cover body from the edge of the opening portion of the cover body, wherein one end of each of the plurality of connection arms is connected to the second bearing accommodating portion and the other end of each of the plurality of connection arms is connected to the guide rib, characterized in that the cover body has a disc plate shape in which the opening portion is formed on an inside thereof. 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 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 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; 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 second bearing accommodating portion at a central portion thereof; a plurality of connection arms that connect the second bearing accommodating portion and the cover body; and guide ribs that extend from an edge of the opening portion, a cover body on which an opening portion is formed therein; a second bearing accommodating portion at a central portion thereof; a plurality of connection arms that connect the second bearing accommodating portion and the cover body; and guide ribs that extend from an edge of the opening portion, wherein the guide ribs extend by a predetermined length in a direction orthogonal to a radial direction of the cover body from the edge of the opening portion of the cover body, wherein one end of each of the plurality of connection arms is connected to the second bearing accommodating portion and the other end of each of the plurality of connection arms is connected to the guide rib, characterized in that the cover body has a disc plate shape in which the opening portion is formed on an inside thereof.