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Electric machine
| Details |
Inventors: Bilsing, Thomas;
Assignee: Robert Bosch GmbH (Stuttgart, DE)
Primary Examiner: Le; Dang
Assistant Examiner:
Attorney, Agent or Firm: Striker; Michael J.
In the case of an electrical machine, in particular an alternator for a motor vehicle, having a housing (2), a rotor (6) that is supported in the housing (2) in a manner that allows it to rotate around an axis of rotation (5) and that has at least one rotor winding (14) and at least one fan wheel (21) mounted on the rotor (6) for generating convection in the housing (2) and for dissipating heat from the at least one rotor winding (14), the at least one fan wheel (21) is joined with the rotor (6) at least in a linear manner in order to better cool the rotor (6). |
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DETAILED DESCRIPTION Based on this, the invention is based on the object of configuring an alternator of the generic type in such a manner that heat dissipation is improved.
As a result of this configuration, heat conduction is improved dramatically due to the larger transitional area from the rotor via the fan wheel to the cooling air.
As a result, the temperatures in the excitation winding as well as the temperatures in the region of the pole fingers are reduced, which allows a performance advantage of the alternator to be attained.
The surface of the rotor around the surface of the fan wheel is therefore enlarged, which allows greater heat dissipation to be achieved.
In a further embodiment of the invention, it is advantageously provided that at least one fan wheel and the rotor are joined over a large area using welding.
Welding ensures that the fan wheel is joined to the rotor in an economical, secure manner having good heat conduction.
It is also advantageous that the at least one fan wheel and the rotor are joined at least along an arc, whereby a two-dimensional configuration of the connection is also possible.
The fan wheel is therefore mounted on the rotor via a large area, in order to reduce thermal resistance.
Better cooling of the rotor is enabled by increasing the size of the cross-sectional area for heat conduction.
The at least one fan wheel and the rotor are preferably joined using ultrasonic welding.
With ultrasonic welding, the welded surface and, therefore, the thermal contact area between fan wheel and rotor can be markedly increased compared to other welding methods, with lower costs.
According to an advantageous embodiment, the at least one fan wheel is made of an aluminum alloy.
The use of fan wheels made of an aluminum alloy has the advantage that heat conduction in the fan wheel is improved considerably compared to fan wheels made of sheet steel.
This is due to the higher thermal conductivity coefficients.
Moreover, the material combination of aluminum and steel makes ultrasonic welding possible
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Generators or Motors 
