Adhesion structure for motor, having thickness determining means

A motor comprising:

• a rotor having a first linear expansion coefficient;
• a plurality of magnets arranged circumferentially on the rotor, said magnets adhered to the rotor by an adhesive agent forming an adhesive agent layer, the magnets having a second linear expansion coefficient that differs from the first linear expansion coefficient;
• and
• a thickness determining means extending in an axial direction of the rotor and arranged on either one of the rotor or the magnets, the thickness determining means determining the thickness of the adhesive agent layer formed from the adhesive agent so as to absorb shearing stress produced by the difference between the first and second linear thermal expansion coefficients at a surface adhered to the magnets, and comprising a circumferentially continuous groove formed in a surface of one of said rotor and said stator, wherein the adhesive agent layer is provided in said groove, and wherein the thickness determining means further includes:
• an opposing surface defined on a surface of each of the magnets opposed to the rotor or the stator and having a radius of curvature that is smaller than the radius of the rotor or the stator;
• and
• a gap defined between the rotor or the stator and the opposing surface of each of the magnets.