Patent ID: 7109615

Claim:
An electronically commutated motor ( 20 ), comprising: an external stator ( 28 ); an A-side bell ( 26 ) provided on a drive side of the motor ( 20 ); a B-side bell ( 66 ) on an opposing side of the motor ( 20 ); a permanent magnet rotor ( 36 ) rotatably arranged in the external stator ( 28 ); a shaft ( 40 ) associated with the permanent magnet rotor ( 36 ) provided with a shoulder ( 78 ) and supported at its drive end ( 42 ) by a rotary bearing ( 54 ) in said A-side bell ( 26 ) and supported at a second shaft end ( 44 ) by a rotary bearing ( 72 ) arranged in said B-side bell ( 66 ); a tensioning element ( 90 , 94 ) secured to said B-side bell ( 66 ), tensioning an outer race ( 70 ) of the rotary bearing ( 72 ) there between said tensioning element and a shoulder ( 67 ) of the B-side bell ( 66 ); a shaped part ( 80 ) composed of non-ferromagnetic material and provided with a recess ( 100 , 102 ); a control magnet ( 110 ), arranged in said recess ( 100 , 102 ), for controlling commutation of said motor; a countersunk screw ( 82 ) screwed into an internal thread ( 84 ) of the other shaft end ( 44 ) which screw, via the shaped part, presses the inner race ( 74 ) of the rotary bearing located in the B-side bell ( 66 ) against a shoulder ( 78 ) of the shaft ( 40 ).