Rotary electric machine with forced ventilation
AssigneeMoteurs Leroy-Somer
InventorsPhilippe Ciciliani, Arnaud Lhote, Hong-Hai Duong
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Abstract
The present invention provides an electric machine with forced ventilation, the machine comprising: a rotor capable of rotating about an axis of rotation; a stator within which the rotor can rotate, said stator comprising a stack of laminations presenting slots housing windings; and a fan, in particular a fan that is capable of rotating independently of the rotor; the laminations being configured to form cooling channels in which a stream of cooling air generated by the fan can flow, and the stack being disposed between two spacers interconnected by bars.
Claims16
1/ An electric machine with forced ventilation, the machine comprising:
- a rotor capable of rotating about an axis of rotation;
- a stator within which the rotor can rotate, said stator comprising:
- two spacers,
- bars interconnecting the two spacers
- a stack of laminations disposed between the spacers, the stack of laminations comprising slots
- windings received in the slots;
- and
- a fan;
- wherein the laminations are configured to form cooling channels in which a stream of cooling air generated by the fan can flow.
2/ A machine according to claim 1, wherein the fan is supported by the machine.
3/ A machine according to claim 1, wherein the cooling channels are formed between fins and wherein the machine includes a cover covering the fins at least in part.
4/ A machine according to claim 3, having two partitions extending substantially perpendicularly to the axis of rotation and placed inside the cover.
5/ A machine according to claim 4, wherein the cover has two air inlets outside the partitions and an air outlet between the two partitions, the inlets and the outlet being situated on a top of the machine, the partitions being configured in such a manner as to constrain air to flow from the inlets towards the outlet via passages situated under the machine.
6/ A machine according to claim 3, wherein the fins extend substantially perpendicularly to the axis of rotation.
7/ A machine according to claim 3, wherein each fin comprises two to twelve laminations.
8/ A machine according to claim 1, wherein the stack of laminations comprises alternating packets of laminations, each packet being made up of laminations that are identical in shape, with laminations of two consecutive packets being of different shapes.
9/ A machine according to claim 8, wherein one of the packets comprises laminations having an outline that is substantially circular while an adjacent packet comprises laminations having additional extensions for forming fins.
10/ A machine according to claim 1, wherein the bars are welded to the spacers.
11/ A machine according to claim 1, wherein each spacer comprises a generally tubular body having a first end adjacent to one end of the stack and a second end opposite to the first end adjacent to a flange welded to the body, the flange serving to fix a corresponding endplate.
12/ A machine according to claim 1, wherein the stack includes at least one internal channel.
13/ A machine according to claim 12, wherein the stack includes fins formed by cutting out within the at least one internal channel.
14/ A machine according to claim 1, wherein the stator has winding heads that are generally triangular in shape.
15/ A machine according to claim 1, wherein the fan is configured to rotate independly of the rotor.
16/ A machine according to claim 7, wherein each fin comprises five to nine laminations.