Air gap adjustment apparatus

An air gap adjustment apparatus, comprising:

• a stator housing;
• a stator installed in the stator housing;
• a rotor rotatably installed with a predetermined air gap inside the stator;
• a bearing installed at an end plate of the stator housing to rotatably support a rotating shaft that rotates integrally with the rotor;
• an adjusting member including an adjusting member body installed partially into the end plate of the stator housing, and a head part of the adjusting member located in a bearing housing of the bearing, wherein the adjusting member adjusts an installation position of the bearing according to a relative rotation angle of the head part with respect to the bearing housing and adjusts the installation position of the bearing according to an angle at which the head part of the adjusting member is positioned and rotated in the bearing housing of the bearing;
• and
• a fastener to fasten the bearing to the end plate of the stator housing, wherein the fastener being inserted from the bearing housing through a fastener-through hole formed through the adjusting member partially into the end plate of the stator housing.