A motor comprising: a shaft; a rotor to which the shaft is coupled; a stator disposed on an outer side of the rotor, wherein the stator includes a stator core having a plurality of teeth, and a coil wound around each of the teeth, wherein each of the teeth includes a body part around which the coil is wound, a protrusion disposed on an end portion of the body part, and two grooves formed on an inner surface of the protrusion, wherein, in a circumferential direction of the stator core, respective ends of the protrusions of adjacent teeth of the stator core have a distance therebetween, and each groove has a width in a range of 1.05 to 1.1 times the distance, wherein the protrusion has a side surface including a first surface extending from the body part and a second surface extending from the first surface, wherein the first surface has a first inclination (θ1) with respect to a side surface of the body part, and the second surface has a second inclination (θ2) with respect to the first surface, wherein the first inclination (θ1) is an obtuse angle of an outer side between the side surface and the first surface of the body part, and the second inclination (θ2) is an obtuse angle of an inner side between the first surface and the second surface, and wherein the grooves are symmetrically disposed based on a reference line passing through a center of a width of the protrusion in a circumferential direction and a center of the body part, characterized in that a first distance between the grooves is equal to a second distance from one end of the protrusion to the groove, wherein a depth of each groove is 0.175 to 0.325 times the distance, wherein the length of the second surface in a radial direction from an inner edge of the first surface to an edge of the inner surface is 1/4 of the distance, wherein the first inclination (θ1) is in a range of 145° to 155°. a shaft; a rotor to which the shaft is coupled; a stator disposed on an outer side of the rotor, wherein the stator includes a stator core having a plurality of teeth, and a coil wound around each of the teeth, wherein each of the teeth includes a body part around which the coil is wound, a protrusion disposed on an end portion of the body part, and two grooves formed on an inner surface of the protrusion, wherein, in a circumferential direction of the stator core, respective ends of the protrusions of adjacent teeth of the stator core have a distance therebetween, and each groove has a width in a range of 1.05 to 1.1 times the distance, wherein the protrusion has a side surface including a first surface extending from the body part and a second surface extending from the first surface, wherein the first surface has a first inclination (θ1) with respect to a side surface of the body part, and the second surface has a second inclination (θ2) with respect to the first surface, wherein the first inclination (θ1) is an obtuse angle of an outer side between the side surface and the first surface of the body part, and the second inclination (θ2) is an obtuse angle of an inner side between the first surface and the second surface, and wherein the grooves are symmetrically disposed based on a reference line passing through a center of a width of the protrusion in a circumferential direction and a center of the body part, characterized in that a first distance between the grooves is equal to a second distance from one end of the protrusion to the groove, wherein a depth of each groove is 0.175 to 0.325 times the distance, wherein the length of the second surface in a radial direction from an inner edge of the first surface to an edge of the inner surface is 1/4 of the distance, wherein the first inclination (θ1) is in a range of 145° to 155°.