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An electromotor, in particular a drive motor for a barrel or container pump, having an outwardly encapsuled motor housing made of a material having good heat conducting characteristics, such as aluminium. The motor housing is provided on its outer side with a shield of an electrically non-conducting

An electromotor, in particular a drive motor for a barrel or container pump, having an outwardly encapsuled motor housing made of a material having good heat conducting characteristics, such as aluminium. The motor housing is provided on its outer side with a shield of an electrically non-conducting material. The shield is surrounded on its outer side with a mantle which forms, with the housing middle portion, a through-stream gap for the passage of cooling air. This outer mantle includes a pair of housing caps, which overlap the end-support shields of the motor housing, and between which housing caps there extends the mantle which shields the outer surface of the housing middle portion by forming the through-stream gap for the passage of cooling air. The outer shielding of the entire motor housing prevents contact with metallic parts and thereby current conducting parts of the motor by a person servicing the device.

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An improved shielding for an electromotor having a motor housing which is sealed at both of its axial ends by means of a pair of support shields, a stator, and rotor operatively mounted in said motor housing, wherein the interior of the motor housing is sealingly closed and the rotor is rotatably mo

An improved shielding for an electromotor having a motor housing which is sealed at both of its axial ends by means of a pair of support shields, a stator, and rotor operatively mounted in said motor housing, wherein the interior of the motor housing is sealingly closed and the rotor is rotatably mounted in the region of one of the support shields of said pair of shields by means of a motor shaft axially extending from said rotor and rotatably mounted and extending through one of the support shields of said pair of shields outside of the motor housing, an air impeller wheel is coaxially mounted on said support shaft outside the motor housing for transporting cooling air, said air impeller wheel includes an outer shield made out of electrically nonconducting material in which the air impeller wheel is coaxially and operatively mounted, said outer shield surrounds the motor housing at a predetermined distance and thereby forms of through-stream paths for cooling air for the motor housing so as to externally cool it, and electrically non-conducting cladding means mounted on the drive-side end of the motor shaft, said electromotor being adapted as a drive motor for a barrel or container pump, the improvement comprising a motor housing being encapsulated with double-protective electric insulation means, wherein said electric insulation means comprise an exterior shield which includes a pair of support shields respectively mounted at opposite axial ends of said motor housing, said electric insulation means further include a pair of housing caps operatively mounted at each axial end of said motor housing and between which latter pair there extends a housing middle portion which is spaced from the motor housing, a mantle extending bet ween said pair of caps, said mantle and housing middle portion defining a through-stream passage therebetween for the flow of cooling air, said impeller wheel is coaxially mounted on a shaft stub of said motor shaft, said stub extends outside of the motor housing at its drive-side and is disposed within the housing cap, one of said pair of caps overlap the corresponding support shield received therein and by means of this overlapping housing cap an outwardly directed streaming path for the cooling air is defined extending from the impeller wheel through said one housing cap, which outward streaming path is partially formed by said through-stream passage between said housing middle portion and said mantle surrounding same, which path is in streaming communication with an air inlet means in said electric insulation means and has outlet means on the drive side of the electromotor directed in a substantially parallel axial direction.