Stator assy, brushless motor, and method for manufacturing stator assy

A stator assy comprising:

• a shaft having a rotor yoke extending therefrom;
• a housing including a first housing member and a second housing member that define a space on an inner side thereof;
• a stator disposed in the space of the housing;
• a magnet on an outer surface of the rotor yoke to face the stator;
• and
• an insulating resin disposed in the space and that fixes the first housing member, the second housing member, and the stator to each other,
• wherein the first housing member includes a main wall, a side wall, and an inner wall,
• wherein the main wall is circular in a plan view, and
• wherein the side wall is cylindrical in the plan view, is disposed along an outer peripheral end of the main wall, and extends in a direction perpendicular to a main surface of the main wall.

A stator assy, comprising:

• a housing that includes a first housing member and a second housing member that define a space therein;
• a stator disposed in the space of the housing;
• an insulating resin that fixes the stator to the housing to reduce excitation vibrations and structure resonance caused in the stator assy in response to rotations of a rotor coupled thereto;
• and
• a supplemental member disposed along an inner peripheral end of the stator to surround the stator and the insulating resin together with the housing,
• wherein the supplemental member includes a cylindrical body portion, an annular bottom portion, and a plurality of protrusions on a circumferential surface of the body portion.