MOTOR, ELECTRIC DRIVE ASSEMBLY SYSTEM, VEHICLE AND METHOD FOR COOLING THE MOTOR
A system and method for cooling the motor having a rotor with a rotor shaft that rotates around a rotation axis, a stator having a core and stator coils located at both axial ends of the core. The cooling system includes a fluid supply channel provided in the rotor shaft, a plurality of groups of fluid flow-out channels arranged on the rotor shaft and corresponding to the stator coil, and a fluid storage channel provided in fluid communication with the fluid supply channel and the fluid flow-out channels. The fluid supply channel is adjacent to at least one of the plurality of groups of fluid flow-out channels and at least partially extends into the fluid storage channel, so that the cooling fluid flowing out of the fluid supply channel enters the fluid storage channel and then flows out of the fluid flow-out channel to cool the stator coil.
1 . A motor, comprising:
a rotor comprising a rotor shaft that rotates around the rotation axis;
a stator comprising a core and stator coil located at both axial ends of the core; and
a cooling system comprising:
a fluid supply channel provided in the rotor shaft;
a plurality of groups of fluid flow-out channels arranged on the rotor shaft and corresponding to the stator coil; and
a fluid storage channel provided at the middle part of the rotor shaft and in fluid communication with the fluid supply channel and the fluid flow-out channels,
wherein the fluid supply channel is adjacent to at least one of the plurality of groups of fluid flow-out channels and at least partially extends into the fluid storage channel, so that the cooling fluid flowing out of the fluid supply channel enters the fluid storage channel and then flows out of the fluid flow-out channel to cool the stator coil.
2 . The motor according to claim 1 , wherein the plurality of groups of fluid flow-out channels comprise a first group of fluid flow-out channels and a second group of fluid flow-out channels, which are respectively arranged at the positions of the two ends of the rotor shaft corresponding to the stator coil.
3 . The motor according to claim 2 , wherein the rotor shaft comprises a hollow cylindrical body, a first part and a second part on both sides of the cylindrical body, and the cylindrical body comprises an inner wall, an outer wall, and the plurality of groups of fluid flow-out channels throughout the inner wall and the outer wall; and
the inner wall between the first group of fluid flow-out channels and the second group of fluid flow-out channels is provided with a groove portion to form the fluid storage channel;
wherein the fluid supply channel is inserted into the first part and at least partially extends beyond the first group of fluid flow-out channels in the direction of the rotation axis, so as to enter the fluid storage channel.
4 . The motor according to claim 3 , wherein the fluid supply channel extends in the direction of the rotation axis no more than ⅓ of the length of the cylindrical body.
5 . The motor according to claim 3 , wherein inlets of the first and/or second group of fluid flow-out channels are radially inward with respect to the inner wall between the first and second group of fluid flow-out channels.
6 . The motor according to claim 5 , wherein a step is provided on the inner wall of the cylindrical body between the first group of fluid flow-out channels and the second group of fluid flow-out channels, and close to the first group of fluid flow-out channels and the second group of fluid flow-out channels, respectively, to form the groove portion.
7 . The motor according to claim 5 , wherein the inner wall of the cylindrical body at the first group of fluid flow-out channels and the second group of fluid flow-out channels is an inclined surface.
8 . The motor according to claim 3 , wherein the first group of fluid flow-out channels and/or the second group of fluid flow-out channels extend at an angle with respect to the rotation axis.
9 . The motor according to claim 8 , wherein the first group of fluid flow-out channels comprises a plurality of first guide holes adjacent to the first part, the second group of fluid flow-out channels comprises a plurality of second guide holes adjacent to the second part, and the first guide holes and/or the second guide holes are circumferentially arranged along the rotor shaft.
10 . The motor according to claim 9 , wherein the first guide holes and/or the second guide holes extend in a radial direction perpendicular to the rotation axis.
11 . The motor according to claim 9 , wherein the first guide holes and/or the second guide holes extend at an angle to the radial direction perpendicular to the rotation axis.
12 . An electric drive assembly system, comprising:
a housing; and
the motor as claimed in claim 1 ,
wherein the rotor shaft is supported in the housing by at least one bearing.
13 . The electric drive assembly system according to claim 12 , further comprising:
a gear shaft rotationally fixedly connected with the rotor shaft, the gear shaft comprising a first end and a second end opposite to each other, and a fluid channel throughout the first and second ends, wherein the second end is formed as the fluid supply channel.
14 . The electric drive assembly system according to claim 13 , further comprising:
a nozzle arranged at the first end and is in fluid communication with the fluid channel, and the nozzle is in clearance fit with the fluid channel.
15 . The electric drive assembly system according to claim 14 , wherein at the outlet of the nozzle, the fluid channel is provided with a stepped hole, and an inner diameter of the stepped hole is smaller than a radial dimension of the fluid channel and larger than an inner diameter of the nozzle orifice.
16 . The electric drive assembly system according to claim 15 , further comprising a bearing support structure for the rotor shaft and the gear shaft, wherein the rotor shaft comprises a hollow cylindrical body and a first part and a second part at both sides of the cylindrical body, wherein the bearing support structure comprises:
a first bearing supporting the gear shaft at the first end;
a second bearing supporting the rotor shaft at the first part; and
a third bearing supporting the rotor shaft at the second part.
17 . A vehicle comprising the electric drive assembly system according to claim 12 .
18 . A method for cooling a motor, comprising:
cooling a stator coil by a cooling system to supply fluid to the stator coil of a stator via a rotor shaft of a rotor, wherein the cooling system comprises a fluid supply channel arranged in the rotor shaft; a plurality of groups of fluid flow-out channels arranged on the rotor shaft and corresponding to the stator coil; and a fluid storage channel provided at the middle part of the rotor shaft and in fluid communication with the fluid supply channel and the fluid flow-out channels,
wherein the fluid supply channel is adjacent to at least one of the plurality of groups of fluid flow-out channels, and at least partially extends into the fluid storage channel, so that the cooling fluid flowing out of the fluid supply channel enters the fluid storage channel, and after the cooling fluid fills the fluid storage channel, it flows out of the fluid flow-out channels to cool the stator coil.
19 . The method according to claim 18 , wherein the plurality of groups of fluid flow-out channels comprises a first group of fluid flow-out channels and a second group of fluid flow-out channels, which are respectively arranged at the positions of both ends of the rotor shaft corresponding to the stator coil; the first group of fluid flow-out channels and/or the second group of fluid flow-out channels extend at an angle relative to the rotation axis of the rotor shaft.
20 . The method according to claim 19 , wherein an inner wall between the first group of fluid flow-out channels and the second group of fluid flow-out channels is provided with a groove portion to form the fluid storage channel.