Electric machine having cooled metal laminated stator and...

H - Electricity – 02 – K

Patent

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H02K 1/20 (2006.01) H02K 1/32 (2006.01) H02K 9/16 (2006.01)

Patent

CA 2522469

High-power electric machines must be intensively cooled. At the same time, it is necessary to ensure a high level of immunity to impurities. For this purpose, the rotor and stator sheet packs (41, 42, 61, 62) are embodied in two parts, thereby making it possible to carry out a two-sided ventilation, said parts being maintained separately in the middle by a ring (5, 7). Said ring (5,7) is provided with ribs (51, 52, 71, 72) in such a way that radial flow channels are formed between partial sheet stacks and ensure corresponding flow rate. In another embodiment, monoblock sheet stacks are provided with cooling channel extensions on either side of the sheet stack. Said cooling extensions alternate on the axial cooling channels in the peripheral direction and transport heated coolant outwards in respectively opposite directions.

Les machines électriques de grande puissance doivent être refroidies de manière intense. Ce faisant, il faut souvent garantir simultanément un degré élevé d'insensibilité aux impuretés. A cet effet, les empilages de tôle de stator et de rotor (41, 42, 61, 62) sont réalisés en deux parties pour permettre une ventilation des deux côtés, les deux parties étant maintenues écartées au milieu par une bague (5, 7). La bague (5, 7) présente des ailettes (51, 52, 71, 72) de sorte que des conduits d'écoulement radiaux apparaissent entre les empilages de tôles partiels (41, 42, 61, 62) et garantissent une vitesse d'écoulement adéquate. Selon un autre mode de réalisation de l'invention, des empilages de tôle monoblocs présentent, en sens périphérique au niveau des conduits de refroidissement axiaux, des prolongements de conduit de refroidissement en alternance sur l'une ou l'autre face de l'empilage de tôle, ces prolongements transportant le réfrigérant réchauffé vers l'extérieur dans des directions respectivement opposées.

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