Motor and air compressor

A motor comprising:

• a central shaft extending in an axial direction;
• a stator extending in the axial direction around the central shaft;
• a rotor facing in a radial direction an outer side of the stator and configured to rotate with the central shaft;
• a substrate which is located on one side of the rotor in the axial direction and on which a rotation position detection circuit configured to detect a rotation position of the rotor is mounted;
• and
• a case located on one side of the substrate in the axial direction and configured to support the stator, wherein
• the stator includes a restricting portion extending in the axial direction and configured to restrict a position of the substrate in a circumferential direction of the substrate,
• the case includes a fixing portion comprising an aperture formed in the case and configured to fix the substrate,
• the substrate includes:
• a restricted portion with a corresponding shape to receive the restricting portion and whose position in the circumferential direction is restricted by the restricting portion, and
• a fixed portion fixed to the fixing portion, wherein the fixed portion of the substrate is fixed to a rotor side of the fixing portion of the case,
• the substrate is configured to be removed from the case in a direction perpendicular to the axial direction, and
• the fixing portion and the fixed portion are located on an outer side of the rotor in the radial direction.