Patent ID: 7859145

Claim:
An electronically commutated motor ( 21 ) having a largest dimension not exceeding 40 mm, comprising: a permanent-magnet external rotor ( 22 ) having a rotor shaft ( 34 ); an internal stator ( 50 ) having a stator lamination stack ( 52 ) with stator poles ( 52 ′, 52 ″, 52 ′″, 52 ″″) between which slots ( 54 ′, 54 ″, 54 ′″, 54 ″″) are defined; an injection-molded plastic coating ( 77 ) which extends through the slots ( 54 ′, 54 ″, 54 ′″, 54 ″″) and, together with the stator lamination stack ( 52 ), forms a bearing tube ( 70 ) for reception of at least one bearing ( 72 , 76 ) for journalling of the rotor shaft ( 34 ), said bearing tube ( 70 ) being formed with a first axial extension ( 90 ′) having a recess ( 91 ) formed with a first shoulder ( 91 ′) and a second shoulder ( 91 ″), said first axial extension ( 90 ′) being configured to engage around, and thereby support, a first rotor bearing ( 72 ) having an outer ring ( 72 ″), said first rotor bearing ( 72 ) being arranged in said recess ( 91 ) such that at least said outer ring ( 72 ″) is axially fixed in a form-locked manner by said first and second shoulders ( 91 ′, 91 ″), said outer ring ( 72 ″) being injection-embedded into the plastic of the bearing tube ( 90 ′).