ELECTRIC ROTARY MACHINE HAVING A VIBRATION DAMPENING AND COOLING STATOR SLEEVE
An electric rotary machine for an automotive vehicle includes a rotor which is non-rotatably connected to a rotor shaft, and a stator which surrounds the rotor. A casing encloses the rotor and stator, the rotor shaft being rotatably mounted on the casing along an X axis. A stator is carried by the casing, and a stator sleeve is radially arranged between an outer surface of the stator and an inner cylindrical surface of the casing. The stator sleeve is made of an elastic material and is arranged to filter vibrations generated by the stator and resulting from electromagnetic forces present in the stator when the electric rotary machine is in operation. The stator sleeve includes a cooling groove which is intended to be connected to a coolant supply line.
1 . Electric rotary machine for an automotive vehicle comprising:
a rotor which is non-rotatably connected to a rotor shaft,
a stator which surrounds the rotor;
a casing in which the rotor and the stator are enclosed, the rotor shaft being rotatably mounted on the casing along an X axis; and
a stator sleeve which is enclosed in the casing and is radially arranged between an outer surface of the stator and an inner cylindrical surface of the casing; the electric rotary machine being wherein the stator sleeve is made of an elastic material and is arranged to filter vibrations which are generated by the stator and result from electromagnetic forces present in the stator when the electric rotary machine is in operation and in that the stator sleeve comprises a cooling groove which is intended to be connected to a coolant supply line.
2 . Electric rotary machine according to claim 1 , wherein the cooling groove is helicoidal around the X axis and is arranged on a radially inner surface of the stator sleeve so that a flow path having a spiral shape is formed between the radially inner surface of the stator sleeve and the outer surface of the stator.
3 . Electric rotary machine according to claim 1 , wherein the casing comprises a supply port which communicates with a first end of the cooling groove.
4 . Electric rotary machine according to claim 1 , wherein the coolant supply line is filled with a coolant which is a dielectric fluid, such as oil.
5 . Electric rotary machine according to claim 1 , wherein the elastic material is an elastomeric material.
6 . Electric rotary machine according to claim 1 , wherein the elastic material has a young modulus which is comprised between 0.001 and 0.1 GPa.
7 . Electric rotary machine according to claim 1 , wherein the casing includes two opposing faces which are orthogonal to the X axis and are joined together by a cylindrical skirt which extends around the X axis.
8 . Electric rotary machine according to claim 7 , wherein the stator is bolted to the one of the two opposing faces of the casing by means of screws which extend parallel to the X axis and each pass through a corresponding hole arranged in the stator.
9 . Electric rotary machine according to claim 7 , wherein the stator sleeve is pressed against at least one of the opposing faces of the casing.
10 . Electric rotary machine according to claim 7 , wherein the casing includes at least two components which each comprise a flanged end, the flanged ends of the two components being attached to each other and wherein the stator sleeve comprises a radial flange which is axially arranged between the two flanged ends.
11 . Electric rotary machine according to claim 2 , wherein the stator sleeve includes metallic inserts which are embedded in the elastic material.
12 . Electric rotary machine according to claim 1 , wherein the stator comprises windings and an iron core which carries the windings.
13 . Electric rotary machine according to claim 12 , wherein the iron core comprises a plurality of ducts which are arranged to conduct the coolant from the cooling groove to the windings.
14 . Automotive vehicle comprising an electric rotary machine according to claim 1 .
15 . Electric rotary machine according to claim 2 , wherein the casing comprises a supply port which communicates with a first end of the cooling groove.
16 . Electric rotary machine according to claim 2 , wherein the coolant supply line is filled with a coolant which is a dielectric fluid, such as oil.
17 . Electric rotary machine according to claim 2 , wherein the elastic material is an elastomeric material.
18 . Electric rotary machine according to claim 2 , wherein the elastic material has a young modulus which is comprised between 0.001 and 0.1 GPa.
19 . Electric rotary machine according to claim 2 , wherein the casing includes two opposing faces which are orthogonal to the X axis and are joined together by a cylindrical skirt which extends around the X axis.
20 . Electric rotary machine according to claim 8 , wherein the stator sleeve is pressed against at least one of the opposing faces of the casing.