Cooled electric machine

摘要

An electric machine (10; 100) comprises a rotor (14a, b) having permanent magnets (24a,b) and a stator (12) having coils (22) wound on stator bars (16) for interaction with the magnets across an air gap (26a, b) defined between them. The bars and coils are enclosed by a stator housing (42a,b; 102, 142a, b,146) that extends between the air gap and defines a chamber (52; 152) incorporating cooling medium to cool the coils.

主权项

1. A yokeless electric machine comprising a rotor having permanent magnets and a stator having coils wound on stator bars for interaction with the magnets across an air gap defined between them, wherein the rotor has two stages arranged one at either end of the stator bars, with air gaps between the ends of the bars and the rotor stages, wherein the bars and coils thereon are enclosed by a stator housing comprising two annular plates and two cylindrical walls defining a chamber incorporating cooling medium in contact with the coils to cool the coils, wherein the coils are coated and are disposed within the chamber, the annular plates extend through the air gaps, said stator housing including a port for supply and a port for drainage of said cooling medium, wherein the cooling medium flows back and forth between the outer and inner radius of the stator housing on plural occasions by reason of blocks disposed between the coils and stator housing, whereby the cooling medium is forced through gaps in between the coils by the blocks.