Abstract: The invention relates to an electrical machine with an internally cooled rotor. In order to improve the cooling power of such a machine without the use of a fan wheel fitted separately on the rotor, the invention proposes an electrical machine with a stator laminate stack and a rotor in a housing, which electrical machine has an internal cooling circuit comprising rotor cooling channels, which pass axially through the rotor and are arranged on two concentric circles, in which internal cooling circuit a gaseous coolant can be circulated, wherein fan vanes and a first means for guiding the coolant from the rotor cooling channels on one of the two concentric circles via a winding head to the rotor cooling channels on the other of the two concentric circles are provided in the case of the machine on a first rotor end side. As a result, particularly those regions are cooled optimally in which the dissipation of lost heat is problematic.

Abstract: An electric machine has a stator (1) and a rotor shaft (3). The rotor shaft (3) is rotatably mounted about a shaft axis (5) in relation to the stator (1), said axis (5) defining an axial direction, a radial direction and a tangential direction. A rotor (6), which is in electrical co-operation with the stator (1), is arranged on the rotor shaft (3). The rotor (6) has at least one continuous axial rotor channel (8). The stator (1) has a lamination stack (10) that extends over the rotor (6) when viewed in the axial direction. The lamination stack (10) completely surrounds the rotor (6) when viewed on a sectional plane that is orthogonal to the axial direction, forming a closed inner rotor chamber (11) when viewed on the sectional plane. A respective cover (14) is provided on both axial sides of the lamination stack (10). At least one of the covers (14) has a central cavity (15) to allow the passage of the rotor shaft (3).

Abstract: A rotor shaft (2) is mounted in the housing (1) of an electric machine so as to be rotatable about a shaft axis (3). The housing (1) has two front faces (4) which axially delimit a housing interior (6). The housing has a peripheral surface (5) which radially delimits the housing interior (6). A rotor lamination stack (7) is arranged on the rotor shaft (2), said stack having axially extending cooling channels (8) and radially extending cooling channels (9). The radially extending cooling channels (9) of the rotor lamination stack (7) are radially open to the outside and extend radially inwards to at least the axially extending cooling channels (8). The housing (1) has two axial dividers (10) which extend radially inwards starting from the peripheral surface (5) but end in front of the rotor shaft (2).; The axial dividers (10) are arranged between the rotor lamination stack (7) and the front faces (4) when seen in the axial direction.

Abstract: The invention relates to an electrical machine (1) having a stator (4) and a rotor (3), with the rotor (3) having a plurality of axially arranged cooling channels (8) and a first (5a) and a second (5b) end face, and a fan unit (6) being arranged adjacent to each end face and comprising at least two 10 fan segments (7), with one fan segment (7) in each case being associated with one cooling channel (8) and being arranged alternately adjacent to the first (5a) and the second (5b) end face, and with the fan segment (7) having at least one air guide channel (7a) and at least one air guide wall (7b).

Abstract: A housing attachment for an electric machine is constructed in compliance with protection class IP 23 and includes a first projected edge disposed at a first border wall such that water located in the middle section at the first border wall drips off no later than at the first projected edge and is led directly or indirectly to the first air inlet opening. Proximate to the first air inlet opening are first laminates which deflect incoming air flowing into the feed air channel to a second edge area. Proximate to the second air outlet opening are second laminates that impart to the flow direction of the outgoing air leaving the outlet air channel a component directed to the top of the electric machine. Third laminates are disposed in an end area of the outlet air channel to deflect the outlet air flowing in the outlet air channel away from the top of the electric machine.

Abstract: An electric machine with improved cooling efficiency includes a stator, a rotor operating as a rotor fan and comprising a shaft defining an axial direction and having radial and axial cooling channels, and an axial fan configured as a twin axial fan and arranged coaxially with the shaft and supplying a coolant to the axial cooling channels. The axial fan has first and second blade rings and a funnel-shaped tube with a smaller opening directly connected to the axial cooling channels of the rotor to deliver coolant to the axial cooling channels of the rotor, and a larger opening, which is non-rotatably connected to and encloses the first blade ring. The second blade ring is firmly attached at an outer circumference of the funnel-shaped tube to deliver the coolant to the stator. Both the stator and the rotor can be cooled using an efficient coolant flow.

Abstract: The invention relates to an electrical machine (1) having a stator (4) and a rotor (3), with the rotor (3) having a plurality of axially arranged cooling channels (8) and a first (5a) and a second (5b) end face, and a fan unit (6) being arranged adjacent to each end face and comprising at least two 10 fan segments (7), with one fan segment (7) in each case being associated with one cooling channel (8) and being arranged alternately adjacent to the first (5a) and the second (5b) end face, and with the fan segment (7) having at least one air guide channel (7a) and at least one air guide wall (7b).

Abstract: The invention relates to an electrical machine with an internally cooled rotor. In order to improve the cooling power of such a machine without the use of a fan wheel fitted separately on the rotor, the invention proposes an electrical machine with a stator laminate stack and a rotor in a housing, which electrical machine has an internal cooling circuit comprising rotor cooling channels, which pass axially through the rotor and are arranged on two concentric circles, in which internal cooling circuit a gaseous coolant can be circulated, wherein fan vanes and a first means for guiding the coolant from the rotor cooling channels on one of the two concentric circles via a winding head to the rotor cooling channels on the other of the two concentric circles are provided in the case of the machine on a first rotor end side. As a result, particularly those regions are cooled optimally in which the dissipation of lost heat is problematic.