Electronically commutated internal rotor motor

摘要

An electronically commutated internal rotor motor ( 20 ) has an outer stator ( 28 ) and a permanent magnet rotor ( 36 ) arranged rotatably therein by means of a shaft ( 40 ) supported at its drive end ( 42 ) by a rotary bearing ( 54 ) located in the A-side bell ( 26 ) and supported at its other end ( 44 ) by a rotary bearing ( 72 ) located in the B-side bell ( 66 ). The rotary bearing ( 54 ) in the A-side bell is preferably so configured that it permits a small radial movement ( 56 ) of the drive end ( 42 ) relative to this bell ( 26 ). The rotary bearing ( 72 ) in the B-side bell ( 66 ) has its outer race ( 72 ) tensioned against a shoulder ( 90, 94 ). Its inner race ( 74 ) is tensioned between a shoulder ( 78 ) of the shaft ( 40 ) and a shaped part of non-ferromagnetic material. This shaped part is pressed by a countersunk screw ( 82 ), screwed into a threaded bore ( 84 ) of the other shaft end ( 44 ), against the inner race.