ELECTRIC MACHINE WITH INCREASED PROTECTION DEGREE AND WITH IMPROVED ROTOR COOLING Russian patent published in 2013 - IPC H02K1/20 H02K1/32 H02K9/10 H02K5/20 

FIELD: electricity.

SUBSTANCE: electric machine includes stator (1) and rotary shaft (3) installed relative to stator (1) with possibility of being rotated about shaft axis (5) so that shaft axis (5) determined axial direction, radial direction and tangential direction. Rotor (6) that is electrically interacts with stator (1) is installed on rotary shaft (3). Rotor (6) has at least one axial channel (8) of rotor, which passes in axial direction. Stator (21) has plate stator pack (10), which in axial direction is continued above rotor (6) and at observation in sectional plane orthogonal to axial direction, it envelopes rotor (6) so that at observation in sectional plane the closed inner cavity (11) of rotor is formed. Corresponding casing (14) is installed on plate pack (10) of stator along the axis on both sides. At least one of casings (14) includes central groove (15) for passage of rotary shaft (3). Stator plate pack (10) has at least one axial channel (12') of stator, which passes in axial direction and is fully closed at observation in sectional plane. Casings (14) are made so that they interact with plate pack (10) of stator and form at least one radial channel (16) passing in radial direction. Radial channels (16) connect at least one axial channel (12') of stator in flow direction to inner cavity (11) of rotor, and are mainly closed. For imposition of forced convection on rotary shaft (3), at least one element (17) acting as a fan is arranged axially inside casings (14). With that, plate pack (10) of stator has additional axial channels (12") of stator, which pass in axial direction and are separated as to flow from inner cavity (11) of the rotor.

EFFECT: providing better cooling of a rotor using simple devices.

10 cl, 7 dwg