| 摘要 |
An improved drum motor, preferably electronically commutated, features a unitary stationary central shaft ( 18 ) supporting a stationary inner stator ( 52 ), and an external rotor ( 49 ), including permanent magnets ( 50 ), secured to an inner surface of a generally cylindrical rotatable casing part ( 18 ). This permits variable speed operation while avoiding any need for an internal gear linkage. Safety is improved by making sealing plates ( 76, 78 ) at respective axial ends of the casing ( 14 ) stationary, and providing an annular peripheral seal ( 90 ) around each sealing plate. Respective rolling bearings ( 24, 44 ) near each end of the casing ( 14 ) facilitate rotation of the external rotor ( 49 ) relative to the stator ( 52 ), and a clamping arrangement ( 30 ) minimizes noise from the bearings.
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