Abstract: A small fan which is constructed as compact axial fan with a central driving motor retained by way of a flange and a bearing support tube, and in which the housing of the fan forms a flow duct that surrounds the rotor; the bearing support of the shaft of the driving motor is constructed as one-piece slide bearing unit which is secured radially in an axial partial area of the bearing support tube by a sliding seat; the bearing support tube consists of a material which can be injection-molded.

Abstract: A small fan which is constructed as compact axial fan with a central driving motor retained by way of a flange and a bearing support tube, and in which the housing of the fan forms a flow duct that surrounds the rotor; the bearing support of the shaft of the driving motor is constructed as one-piece slide bearing unit which is secured radially in an axial partial area of the bearing support tube by a sliding seat; the bearing support tube consists of a material which can be injection-molded.

Abstract: An axial-flow fan, particularly a small fan which is axially compact, with a scroll plate surrounding the impeller and whose inner contour has a cylindrical configuration in the vicinity of the axial median plane and extends both towards the inlet side and the outlet side in a polygonal, particularly square profile accompanied by the formation of corner areas, and with a central, coaxial core formed by the drive motor, the impeller hub and the mounting flange for the drive motor; the core thereby has an annular surface conically tapering towards the inlet side face whose axial length is at least one-third of the hub length; with respect to the axial median plane, the scroll plate is asymmetrical in the corner areas and is made cylindrical over a longer distance from the axial median plane to the inlet side than to the outlet side.

Abstract: In an axial fan whose fan wheel is retained in a tubular member by spokes, the blade edges of the individual fan blades which face the spokes are constructed geometrically different from one another.

Abstract: A mounting arrangement for connecting strand connectors to a stator winding of an electric motor utilizes axially aligned pockets in an end mounting plate of the stator, into which the connectors are inserted. A cover plate is then lockedly mounted onto a control portion of the end mounting plate, and together with the end plate defines a tortuous path for the strand connectors, wherein the connectors axially leaving the pockets are first bent radially outward, then bent back to the original axial direction and then bent radially outwardly again. This tortuous bending path provides for strain elimination at the point of connection of the connectors to the stator inside the pockets.

Abstract: The stators of collectorless d.c. motors are securely connected with the bearing support member, and/or with the fastening flange. The printed circuit board with the electronic components for the commutation is arranged for space reasons in collectorless d.c. motors between the fastening flange and the stator. This type of construction makes impossible an exchange of, for example, defective components. According to this invention, a removable stator is proposed which is retained and secured by means of only a spring element.

Abstract: Disclosed is an arrangement for providing an electrical connection to the enamelled wire of a coil of an electrical motor. The arrangement includes a circuit board carrying at least one conductive component such as an electrical trace on the surface of the circuit board. A conductive pin-type contact, also carried by the circuit board, is electrically connected to the conductive component. An insulating body is carried by the electrical motor and includes passageways for receiving at least two pin-receiving receptacle terminals. The receptacle terminals have inwardly-extending rib members for engaging the enamelled wire when the enamelled wire and the pin-type contact are inserted therein. The rib members are operative to penetrate the enamel covering to establish electrical contact with the wire.

Abstract: A heat sink for instrument parts and electronic devices is provided, the heat sink including an elongated rectangular plate having cooling ribs, the ribs extending in the longitudinal direction of the plate. A fan having radial discharge is mounted on the plate to effect ventilation of the ribs and the devices mounted on the heat sink.

Abstract: An axially-flow fan motor structure of the type having an external rotor of a rotor stack and short-circuit rings, a stator structure and a rotor shaft with a fitting for connecting the external rotor for rotation about the stator structure, wherein the fitting is a flat metal sheet having anchoring elements about the peripheral edge extending at an angle .alpha. of less than 45.degree. with respect to the plane of the sheeet. Thus, by this structure, improvements in the fan efficiency can be effected, particularly since the anchoring elements can be further spaced from the rotor pack. A further improvement can be provided in this structure by the use of a shaded-pole stator wherein the coil structure dimensions, radially and axially, of the stator are confined within defined boundaries.

Abstract: A radial flow fan of short axial length and large radial dimensions and of the type having the drive motor arranged coaxially with respect to the fan wheel and at least partly inside of the fan wheel. The housing for the fan wheel and motor includes a flat metallic square plate forming an axial end face and a synthetic resinous material circumferential housing attached to the metal plate. The circumferentially extending housing portion also includes a portion defining the opposite end wall of the casing with respect to the metal plate end wall, which opposite end wall has a central opening for inlet of air. The synthetic resinous housing portion includes an exit port for radial exit of the air. The metal plate is connected with good heat conductivity with the stator of the drive motor by way of a flange of a bearing for the shaft of the drive motor and by way of a contact disc which axially supports the rotor shaft at the metal plate.

Abstract: A radial flow fan of short axial length and large radial dimensions and of the type having the drive motor arranged coaxially with respect to the fan wheel and at least partly inside of the fan wheel. The housing for the fan wheel and motor includes a flat metallic square plate forming an axial end face and a synthetic resinous material circumferential housing attached to the metal plate. The circumferentially extending housing portion also includes a portion defining the opposite end wall of the casing with respect to the metal plate end wall, which opposite end wall has a central opening for inlet of air. The synthetic resinous housing portion includes an exit port for radial exit of the air. The metal plate is connected with good heat conductivity with the stator of the drive motor by way of a flange of a bearing for the shaft of the drive motor and by way of a contact disc which axially supports the rotor shaft at the metal plate.

Abstract: Disclosed is an arrangement for providing an electrical connection to the enamelled wire of a coil of an electrical motor. The arrangement includes a circuit board carrying at least one conductive component such as an electrical trace on the surface of the circuit board. A conductive pin-type contact, also carried by the circuit board, is electrically connected to the conductive component. An insulating body is carried by the electrical motor and includes passageways for receiving at least two pin-receiving receptacle terminals. The receptacle terminals have inwardly-extending rib members for engaging the enamelled wire when the enamelled wire and the pin-type contact are inserted therein. The rib members are operative to penetrate the enamel covering to establish electrical contact with the wire.