ROTOR OF DIRECT-CURRENT BRUSHLESS MOTOR, BLOWER, AND AIR CONDITIONER

摘要

PROBLEM TO BE SOLVED: To structurally ensure fixing strength for magnets in the direction of revolution and in the axial direction, and further to enhance the concentricity between the magnets and a back yoke. SOLUTION: Whirl-stop recesses which extend from the one-side end of the back yoke in the axial direction to a midpoint in the axial direction are formed in the circumferential surface of the back yoke in the axial direction. Whirl-stop projections are formed on the inner circumferential surface of the ring-shaped magnet of a rotor in the axial direction. The whirl-stop projections are fit into the whirl-stop recesses to cause the projections and the recesses to function as a whirl-stop in the direction of revolution and further as a coming-off stopper for preventing the ring-shaped magnet of the rotor from coming-off to the other-side end in the axial direction. Further, coming-off preventing members which function to prevent the ring-shaped magnet of the rotor from coming-off to the one-side end in the axial direction. In addition, clearance adjusting projections for adjusting and uniformizing the clearance between the magnet and the back yoke are formed on the inner circumferential surface of the ring-shaped magnet of the rotor.