CN114598078A - Motor rotor subassembly, motor, vehicle - Google Patents
Motor rotor subassembly, motor, vehicle Download PDFInfo
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- CN114598078A CN114598078A CN202210277874.6A CN202210277874A CN114598078A CN 114598078 A CN114598078 A CN 114598078A CN 202210277874 A CN202210277874 A CN 202210277874A CN 114598078 A CN114598078 A CN 114598078A
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- 238000001816 cooling Methods 0.000 claims abstract description 59
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000000110 cooling liquid Substances 0.000 claims abstract description 45
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 62
- 238000004804 winding Methods 0.000 claims description 22
- 238000004080 punching Methods 0.000 claims description 21
- 239000002826 coolant Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000010030 laminating Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 11
- 239000010959 steel Substances 0.000 abstract description 11
- 230000017525 heat dissipation Effects 0.000 abstract description 7
- 238000007789 sealing Methods 0.000 abstract description 6
- 230000005347 demagnetization Effects 0.000 abstract description 5
- 239000000758 substrate Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention provides a motor rotor assembly, a motor and a vehicle, wherein the motor rotor assembly comprises: a rotating shaft which is a hollow shaft sleeve structure with a central sealing space; the rotor iron core is sleeved on the outer peripheral wall of the rotating shaft; the rotor core is provided with a first cooling flow channel, the shaft wall of the rotating shaft is provided with an overflowing hole, the rotating shaft is further provided with a cooling liquid introducing structure capable of introducing external cooling liquid into the central sealed space, and the external cooling liquid is introduced into the central sealed space and then enters the first cooling flow channel through the overflowing hole and flows out of the rotor core. According to the invention, external cooling liquid can be introduced into the rotor core through the hollow shaft sleeve structure of the rotating shaft, so that efficient cooling and heat dissipation of the rotor core can be realized, temperature rise caused by insufficient cooling of the rotor core is effectively prevented, the high-temperature demagnetization phenomenon of the magnetic steel arranged in the rotor core is further effectively prevented, and the motor performance is improved.
Description
Technical Field
The invention belongs to the technical field of motor manufacturing, and particularly relates to a motor rotor assembly, a motor and a vehicle.
Background
With the continuous development of the new energy automobile industry, the main drive motor used for the electric automobile is also continuously and iteratively evolved, and the permanent magnet synchronous motor is gradually taken as a main flow scheme in the current market. The electric automobile's operating condition is abominable and complicated, again under the operating condition that the operating condition and the long slope low speed cruise are sharply accelerated, need the very big torque of motor output, the electric current is very big this moment, and the winding loss is very big to produce a large amount of heats, showing the temperature that increases the motor, can cause the damage to the motor under the extreme situation. Therefore, in most of the existing electric automobile main drive motors, the low end uses air cooling for heat dissipation, the middle end uses water cooling, and the high end uses oil cooling with higher efficiency.
When a main drive motor of a new energy automobile is in an actual operation process and is in low-speed and high-torque, a stator of the main drive motor can emit a large amount of heat, the end part of a heating source winding of the stator of the main drive motor is cooled by a plurality of ways in the oil cooling prior art, cooling liquid is directly sprayed to the end parts of a front winding and a rear winding, flows out of a flow guide groove at the bottom of a shell after absorbing heat, and is input into the interior of the motor again to be sprayed after being cooled by a radiator.
The oil cooling technology is mainly applied to high-end passenger cars, because the oil cooling technology has more excellent heat dissipation efficiency compared with water cooling, only heat can be conducted to a stator core from a winding, then conducted to a shell by the stator core and finally taken away by circulating water in a water channel to be different, the oil cooling technology can directly spray the front end part and the rear end part of the winding with the most serious heat generation, when a new energy electric car needs to enter a working condition of quick start or sudden acceleration, in order to obtain large torque, the winding is inevitably led to pass through large current in a short time, and the large current can lead the winding to generate heat seriously, only the oil cooling scheme can be used for taking away the heat at the end part of the winding in time, which is also the main reason that the oil cooling technology is applied to the high-end passenger electric cars, but the problem still exists to be solved at present, when a motor enters a high rotating speed interval, the rotating speed of the rotor can reach more than 10000rpm, at this moment, under the operating mode of high rotational speed, the magnet steel can generate heat because of the reason that the eddy current loss greatly promoted to lead to the rotor to generate heat, present rank end does not have the cooling measure of scheme to the rotor, just means that the rotor can only pass through motor spindle conduction heat and to the inside air radiation of motor a small part of heat, and if the rotor temperature is continuously high, to the magnet steel of tombarthite permanent magnet material, has the risk of demagnetization, causes the permanent decline of motor performance.
Disclosure of Invention
Therefore, the invention provides a motor rotor assembly, a motor and a vehicle, which can overcome the defects that in the prior art, the performance of the motor is reduced due to demagnetization of magnetic steel on a rotor core caused by insufficient cooling of the rotor core and high and low temperature of the rotor.
In order to solve the above problems, the present invention provides a rotor assembly for an electric motor, comprising:
a rotating shaft which is a hollow shaft sleeve structure with a central sealing space;
the rotor iron core is sleeved on the outer peripheral wall of the rotating shaft;
the rotor core is provided with a first cooling flow channel, the shaft wall of the rotating shaft is provided with an overflowing hole, the rotating shaft is further provided with a cooling liquid introducing structure capable of introducing external cooling liquid into the central sealed space, and the external cooling liquid is introduced into the central sealed space and then enters the first cooling flow channel through the overflowing hole and flows out of the rotor core.
In some embodiments of the present invention, the substrate is,
be provided with the homocline structure in the central confined space, cross the discharge orifice and have a plurality ofly, it is a plurality of cross the discharge orifice and follow the circumference interval of pivot sets up, the homocline structure include a plurality of homocline arms and with a plurality of the coolant liquid entry of homocline arm intercommunication is a plurality of homocline arm and a plurality of cross the discharge orifice one-to-one setting respectively.
In some embodiments of the present invention, the substrate is,
the liquid equalizing arm is in a strip shape extending along the axial direction of the rotating shaft.
In some embodiments of the present invention, the substrate is,
the inner peripheral wall of the hollow shaft sleeve structure is provided with a plurality of strip grooves extending along the axial direction of the rotating shaft, and the liquid equalizing arm is inserted into the strip grooves.
In some embodiments of the present invention, the substrate is,
the cross section of the strip groove is in a T shape, the cross section of the T shape is positioned on one side far away from the central sealing space, and the cross section of the liquid equalizing arm is matched with the cross section of the strip groove in shape; and/or the presence of a gas in the gas,
one side of the liquid equalizing arm facing the strip groove is provided with a strip-shaped liquid outlet.
In some embodiments of the present invention, the substrate is,
the pivot include rotor core equipment section and assemble in long shaft section, minor axis section at the axial both ends of rotor core equipment section, rotor core equipment section has axial extension's central through-hole, long shaft section and minor axis section and central through-hole form jointly central confined space.
In some embodiments of the present invention, the substrate is,
the cooling liquid introducing structure comprises an axial liquid introducing section which is constructed on one side of the long shaft section, which faces the short shaft section, an outlet of the axial liquid introducing section is in butt joint communication with the cooling liquid inlet, and the flow direction of the cooling liquid in the axial liquid introducing section is opposite to that of the cooling liquid in the liquid homogenizing arm.
In some embodiments of the present invention, the substrate is,
first cooling runner includes radial runner and axial runner, rotor core includes along first iron core, the second iron core of axial closed assembly of pivot, wherein axial runner structure in on the first iron core, radial runner structure in on the second iron core.
In some embodiments of the present invention, the substrate is,
the second iron core is formed by a plurality of second punching sheets in a laminated mode, a plurality of radial strip-shaped grooves extending along the radial direction of the second punching sheets are arranged on the second punching sheets, each radial strip-shaped groove corresponds to the overflowing hole in position, and the stacking height of the second iron core is equal to the aperture of the overflowing hole.
In some embodiments of the present invention, the substrate is,
the first iron core is formed by laminating a plurality of first punching sheets, a plurality of arc grooves are formed in the first punching sheets at intervals along the circumferential direction of the first punching sheets, and each arc groove is correspondingly communicated with each radial strip-shaped groove.
In some embodiments of the present invention, the substrate is,
one end of at least axial of second iron core is folded and is equipped with first iron core, first iron core is kept away from one side of second iron core is equipped with the iron core end plate, a plurality of coolant liquid drain pipes have on the iron core end plate, the play liquid direction orientation of coolant liquid drain pipe in with the position of the winding tip in the stator module that motor rotor subassembly matches.
The invention also provides a motor which comprises the motor rotor assembly.
In some embodiments, the electric machine further comprises:
and the machine shell is internally provided with a second cooling flow passage, the position of the second cooling flow passage is matched with that of the stator assembly, the cooling liquid in the second cooling flow passage is water, and the cooling liquid in the first cooling flow passage is cooling oil.
The invention further provides a vehicle which comprises the main drive motor.
According to the motor rotor assembly, the motor and the vehicle, provided by the invention, external cooling liquid can be introduced into the rotor core through the hollow shaft sleeve structure of the rotating shaft, so that efficient cooling and heat dissipation of the rotor core can be realized, the temperature rise caused by insufficient cooling of the rotor core is effectively prevented, the high-temperature demagnetization phenomenon of the magnetic steel arranged in the rotor core is further effectively prevented, and the motor performance is improved.
Drawings
FIG. 1 is an exploded view of a rotor assembly of an electric machine according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a partial cross-sectional view of a rotor core of a rotor assembly of an electric machine according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of the first stamped steel in fig. 3;
fig. 5 is a schematic structural diagram of the second stamped steel in fig. 3;
fig. 6 is a schematic structural view (partially cut away) of a core end plate provided at an end of a rotor core in a rotor assembly of an electric machine according to an embodiment of the present invention;
fig. 7 is a schematic view (partially in section) of the internal structure of a motor according to another embodiment of the present invention;
fig. 8 is a schematic view of the connection of the motor to an external cooling source and the flow of a cooling medium (oil or water) (shown by arrows in the figure) according to another embodiment of the present invention.
The reference numerals are represented as:
1. a rotating shaft; 11. an overflowing hole; 12. a strip groove; 13. a rotor core assembly section; 14. a long shaft section; 15. a short shaft section; 16. an axial liquid guiding section; 2. a rotor core; 31. a liquid homogenizing arm; 311. a strip-shaped liquid outlet; 32. a coolant inlet; 41. an axial flow passage; 42. a radial flow passage; 51. a first iron core; 511. a first punching sheet; 512. an arc groove; 52. a second iron core; 521. a second punching sheet; 522. a radial strip groove; 61. an iron core end plate; 62. a coolant outlet pipe; 71. an oil pump; 72. an oil heat exchanger; 81. a water pump; 82. a water heat exchanger; 100. a stator assembly; 101. a winding end portion; 200. a housing; 201. a second cooling flow passage.
Detailed Description
Referring collectively to fig. 1 through 8, according to an embodiment of the present invention, there is provided an electric motor rotor assembly including: a rotating shaft 1 having a hollow shaft sleeve structure with a central sealed space; the rotor iron core 2 is sleeved on the outer peripheral wall of the rotating shaft 1; the rotor core 2 is configured with a first cooling flow channel, the shaft wall of the rotating shaft 1 (i.e. the cylindrical wall of the hollow bushing structure) is provided with an overflowing hole 11, the rotating shaft 1 is further provided with a cooling liquid introducing structure capable of introducing an external cooling liquid (specifically, for example, cooling oil) into the central sealed space, and after the external cooling liquid is introduced into the central sealed space, the external cooling liquid enters the first cooling flow channel (not shown) through the overflowing hole 11 and flows out of the rotor core 2. In this technical scheme, can via the hollow shaft sleeve structure of pivot 1 introduces external cooling liquid rotor core 2's inside to can realize rotor core 2's high-efficient cooling heat dissipation, will rotor core 2 and the heat of the magnet steel output on it in time takes away, effectively prevents because rotor core 2 cools off the not enough intensification of bringing, and then effectively prevents that the high temperature demagnetization phenomenon of the magnet steel (especially permanent magnet) that sets up in rotor core 2 from taking place, improves motor performance.
Specifically, the external cooling liquid may be directly introduced into the central sealed space, and the external cooling liquid can be forced into the first cooling flow channel after the central sealed space is filled with the cooling liquid, so as to cool the rotor core 2, but this way requires a large amount of cooling liquid, which increases the mass of the rotating shaft 1, and is not beneficial to the rotation control of the rotating shaft 1, and in addition, due to the rotation action of the rotating shaft 1, this way does not easily distribute the cooling liquid uniformly into the plurality of overflowing holes 11, in some embodiments, a liquid equalizing structure is disposed in the central sealed space, the overflowing holes 11 have a plurality of overflowing holes 11, the plurality of overflowing holes 11 are disposed at intervals along the circumferential direction of the rotating shaft 1, the liquid equalizing structure includes a plurality of liquid equalizing arms 31 and cooling liquid inlets 32 communicated with the plurality of liquid equalizing arms 31, the plurality of liquid equalizing arms 31 and the plurality of overflowing holes 11 are disposed in one-to-one correspondence respectively, in this technical scheme, it is right to realize through a plurality of equal liquid arm 31 the pertinence distribution of the coolant liquid that coolant liquid entry 32 introduced can make the quantity of coolant liquid less on the one hand, reduces the rotatory inertia of rotor and is convenient for control, and on the other hand then is favorable to the even distribution of coolant liquid in rotor core 2's circumference, and then guarantees that rotor core 2's circumference temperature is unanimous. Preferably, the plurality of the liquid-uniforming arms 31 are provided at regular intervals in the circumferential direction of the rotor core 2. As shown in fig. 1, the number of the liquid-equalizing arms 31 is four (at this time, the liquid-equalizing structure is a five-way structure), and the four liquid-equalizing arms 31 are uniformly arranged in the circumferential direction of the rotating shaft 1 at intervals, so that the mass of the rotating shaft 1 is more uniform in the circumferential direction, and the dynamic balance is better.
The liquid-distributing arm 31 is a strip extending along the axial direction of the rotating shaft 1, and the liquid-distributing arm 31 extending along the strip can have a larger contact area with the rotating shaft 1 and/or the central sealing space, which is also beneficial to cooling and heat dissipation of the rotating shaft 1.
In a specific embodiment, the inner peripheral wall of the hollow sleeve structure is provided with a plurality of strip grooves 12 extending along the axial direction of the rotating shaft 1, the liquid homogenizing arm 31 is inserted into the strip grooves 12, reliable fixing and assembling of the liquid homogenizing structure can be realized through the insertion relationship between the strip grooves 12 and the liquid homogenizing arm 31, and quality problems caused by unreliable connection of the liquid homogenizing structure in the rotating process of the rotating shaft 1 are effectively prevented.
Referring to fig. 2, the cross-sectional shape of the strip groove 12 is a T shape, and the cross section of the T shape is located on a side away from the central sealed space, and the cross-sectional shape of the liquid-homogenizing arm 31 is adapted to the cross-sectional shape of the strip groove 12, so that the position of the liquid-homogenizing structure in the central sealed space can be further ensured to be reliable and stable by using a T-shaped necking positioning structure, it should be noted that when the liquid-homogenizing arm 31 is inserted into the strip groove 12, matching sealing performance between the liquid-homogenizing arm 31 and the strip groove 12 should be ensured, and the coolant in the liquid-homogenizing arm 31 is prevented from leaking out, for example, the sealing effect can be achieved by coating a sealant on the peripheral wall of the liquid-homogenizing arm 31 before insertion.
The overflowing hole 11 is in the axial of the rotating shaft 1 can be arranged in a plurality of rows at intervals, at this time, in one embodiment, the liquid-equalizing arm 31 faces to one side of the strip groove 12, a strip-shaped liquid outlet 311 is arranged, the strip-shaped liquid outlet 311 can be communicated with the overflowing holes 11 in the same axial direction at the same time, and the connecting structure of a liquid path is simplified.
The pivot 1 includes rotor core equipment section 13 and assemble in long axis section 14, minor axis section 15 at rotor core equipment section 13's axial both ends, rotor core equipment section 13 has the central through-hole of axial extension, long axis section 14 and minor axis section 15 form with central through-hole jointly central confined space forms through the equipment of three shaft part pivot 1, can be convenient for equal liquid structure is in equipment in the central confined space. It should be noted that the long shaft segment 14 and the short shaft segment 15 are respectively provided with a shaft shoulder structure pivotally connected to a corresponding motor end cover, the long shaft segment 14 and the short shaft segment 15 may be welded to two ends of the rotor core assembly segment 13, for example, and the two segments jointly achieve axial positioning of the liquid-homogenizing structure, and of course, the long shaft segment 14 and the short shaft segment 15 may also be detachably (for example, by interference fit) connected to two ends of the rotor core assembly segment 13.
The cooling liquid introducing structure comprises an axial liquid guiding section 16 which is constructed on one side, facing the short shaft section 15, of the long shaft section 14, an outlet of the axial liquid guiding section 16 is in butt joint communication with the cooling liquid inlet 32, the flow direction of the cooling liquid in the axial liquid guiding section 16 is opposite to that of the cooling liquid in the liquid homogenizing arm 31, namely the axial length of the axial liquid guiding section 16 is approximately equal to that of the rotor core assembling section 13, so that the cooling liquid can have a large flow path in the central sealed space, and the temperature in the central sealed space can be effectively reduced while the rotor core 2 is effectively cooled.
Specifically, referring to fig. 3, the first cooling flow channel includes a radial flow channel 42 and an axial flow channel 41, the rotor core 2 includes a first core 51 and a second core 52 stacked along the axial direction of the rotating shaft 1, wherein the axial flow channel 41 is configured on the first core 51, the radial flow channel 42 is configured on the second core 52, the radial flow channel 42 can radially introduce the cooling liquid in the liquid homogenizing structure into the axial flow channel 41, and the axial flow channel 41 can form heat exchange with the rotor core 2 along the axial flow channel of the rotor core 2, so as to achieve the cooling purpose. Specifically, the second iron core 52 is formed by laminating a plurality of second punching sheets 521, the second punching sheets 521 are provided with a plurality of radial strip-shaped grooves 522 extending along the radial direction of the second punching sheets, the position of each radial strip-shaped groove 522 corresponds to the overflowing hole 11, and the stack height of the second iron core 52 is equal to the aperture of the overflowing hole 11. The first iron core 51 is formed by laminating a plurality of first punching sheets 511, as shown in fig. 4, a plurality of arc grooves 512 are formed in each first punching sheet 511 at intervals along the circumferential direction of the first punching sheet 511, and each arc groove 512 is correspondingly communicated with each radial strip-shaped groove 522. The circumferential extension length (arc length) of the arc groove 512 should be as large as possible under the condition that the first punching sheet 511 has enough structural strength and does not affect the magnetic density saturation, and is as close as possible to the magnetic steel which generates heat due to eddy current loss, and when the cooling liquid flows at the arc groove 512, the heat generated by the magnetic steel and the rotor due to eddy current loss can be effectively taken away.
In some embodiments, the first iron core 51 is stacked on at least one axial end of the second iron core 52, an iron core end plate 61 is disposed on a side of the first iron core 51 away from the second iron core 52, the iron core end plate 61 has a plurality of coolant liquid outlet pipes 62, and a liquid outlet direction of the coolant liquid outlet pipes 62 faces a position of the winding end 101 in the stator assembly 100 matched with the motor rotor assembly, so that the coolant liquid flowing out of the arc groove 512 can be further thrown onto the winding end 101, and further cooling of the winding end 101 is achieved. It should be noted that, in this technical scheme, the corresponding coolant outlet pipe 62 is arranged on the core end plate 61, so that the centrifugal force of the rotating motor rotor assembly can be utilized to throw the coolant onto the winding end 101, and the effective cooling of the winding end can be realized without improving other structures of the motor, which is simple and easy to implement. The coolant outlet 62 may be implemented, for example, with a converging nozzle. It should be noted that, in the prior art, cooling of the winding end is mostly achieved by arranging a corresponding oil injection ring adjacent to the winding end, and the structure of the method is complex, the flow distribution difficulty angle is large, and the similar corresponding oil path structure design is complex.
It should be noted that the number of the second iron core 52 corresponds to the number of the rows of the overflowing holes 11 in the axial direction of the rotating shaft 1, and in a specific embodiment, the first iron core 51 is stacked on both axial ends of the second iron core 2.
According to an embodiment of the invention, there is also provided an electric machine including the electric machine rotor assembly described above. Referring specifically to fig. 7, the motor further includes: and the machine shell 200 is internally provided with a second cooling flow channel 201, the position of the second cooling flow channel 201 is matched with that of the stator assembly 100, the cooling liquid in the second cooling flow channel 201 is water, and the cooling liquid in the first cooling flow channel is cooling liquid. In this technical scheme, the second cooling channel 201 on the casing 200 cools the stator assembly 100 by water cooling, and the first cooling channel in the motor rotor assembly cools the rotor core 2, the rotating shaft 1 and the winding end 101 by oil cooling, thereby effectively ensuring the performance of the motor. Effectively avoid among the prior art, because of water has electrically conductive and corrosive characteristic, therefore the cooling water can only be in the casing intermediate layer circulation, and stator core takes away the heat with heat transfer to casing through the flow of circulating water through heat-conduction, and this kind of single cooling method easily causes the stator cooling inequality, forms the phenomenon emergence of local heat isolated island. This technical scheme can have the inside heat dissipation of winding middle part, winding overhang, rotor core concurrently, can be applicable to the motor design scheme of higher heat load, promotes the motor performance to and motor operating stability.
As shown in fig. 8, in a specific embodiment, an oil pump 71 and an oil heat exchanger 72 outside the motor are used for oil cooling circulation of the motor, and a water pump 81 and a water heat exchanger 82 outside the motor are used for water cooling circulation of the motor.
The invention further provides a vehicle which comprises the main drive motor.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (14)
1. An electric machine rotor assembly, comprising:
a rotating shaft (1) which is a hollow shaft sleeve structure with a central sealed space;
the rotor iron core (2) is sleeved on the outer peripheral wall of the rotating shaft (1);
the rotor core (2) is provided with a first cooling flow channel, the shaft wall of the rotating shaft (1) is provided with an overflowing hole (11), the rotating shaft (1) is further provided with a cooling liquid introducing structure capable of introducing external cooling liquid into the central sealed space, and the external cooling liquid is introduced into the central sealed space and then enters the first cooling flow channel through the overflowing hole (11) and flows out of the rotor core (2).
2. The electric machine rotor assembly of claim 1,
be provided with the structure of equaling liquid in the central seal space, it is a plurality of to cross discharge orifice (11) and have, a plurality of cross discharge orifice (11) and follow the circumference interval setting of pivot (1), the structure of equaling liquid includes a plurality of equal liquid arms (31) and with a plurality of coolant liquid entry (32) of equal liquid arm (31) intercommunication, a plurality of equal liquid arm (31) and a plurality of cross discharge orifice (11) respectively one-to-one setting.
3. The electric machine rotor assembly of claim 2,
the liquid equalizing arm (31) is in a strip shape extending along the axial direction of the rotating shaft (1).
4. The electric machine rotor assembly of claim 3,
the inner peripheral wall of the hollow shaft sleeve structure is provided with a plurality of strip grooves (12) extending along the axial direction of the rotating shaft (1), and the liquid homogenizing arm (31) is inserted into the strip grooves (12).
5. The electric machine rotor assembly of claim 4,
the cross section of the strip groove (12) is in a T shape, the cross section of the T shape is positioned on one side far away from the central sealed space, and the cross section of the liquid equalizing arm (31) is matched with the cross section of the strip groove (12); and/or the presence of a gas in the gas,
one side of the liquid equalizing arm (31) facing the strip groove (12) is provided with a strip-shaped liquid outlet (311).
6. The electric machine rotor assembly of claim 2,
the rotating shaft (1) comprises a rotor core assembling section (13) and a long shaft section (14) and a short shaft section (15) which are assembled at the two axial ends of the rotor core assembling section (13), the rotor core assembling section (13) is provided with a central through hole extending axially, and the long shaft section (14) and the short shaft section (15) and the central through hole jointly form the central sealed space.
7. The electric machine rotor assembly of claim 6,
the cooling liquid introducing structure comprises an axial liquid guiding section (16) which is configured on one side of the long shaft section (14) facing the short shaft section (15), an outlet of the axial liquid guiding section (16) is in butt joint communication with the cooling liquid inlet (32), and the flow direction of cooling liquid in the axial liquid guiding section (16) is opposite to that of cooling liquid in the liquid homogenizing arm (31).
8. The electric machine rotor assembly of claim 1,
the first cooling flow channel comprises a radial flow channel (42) and an axial flow channel (41), the rotor core (2) comprises a first iron core (51) and a second iron core (52) which are axially stacked along the rotating shaft (1), wherein the axial flow channel (41) is formed in the first iron core (51), and the radial flow channel (42) is formed in the second iron core (52).
9. The electric machine rotor assembly of claim 8,
the second iron core (52) is formed by laminating a plurality of second punching sheets (521), the second punching sheets (521) are provided with a plurality of radial strip-shaped grooves (522) extending along the radial direction of the second punching sheets, each radial strip-shaped groove (522) corresponds to the overflowing hole (11), and the overlapping height of the second iron core (52) is equal to the aperture of the overflowing hole (11).
10. The electric machine rotor assembly of claim 9,
the first iron core (51) is formed by laminating a plurality of first punching sheets (511), a plurality of arc grooves (512) are formed in the first punching sheets (511) at intervals along the circumferential direction of the first punching sheets, and each arc groove (512) is correspondingly communicated with each radial strip-shaped groove (522).
11. The electric machine rotor assembly of claim 8,
one end of at least axial of second iron core (52) is folded and is equipped with first iron core (51), first iron core (51) are kept away from one side of second iron core (52) is equipped with iron core end plate (61), a plurality of coolant liquid drain pipes (62) have on iron core end plate (61), the play liquid direction orientation of coolant liquid drain pipe (62) with the position of winding tip (101) in stator module (100) that motor rotor subassembly matches.
12. A motor is characterized in that the motor is provided with a stator,
an electric machine rotor assembly including an electric machine as claimed in any one of claims 1 to 11.
13. The electric machine of claim 12, further comprising:
the machine shell (200) is internally provided with a second cooling flow channel (201), the position of the second cooling flow channel (201) is matched with the position of the stator assembly (100), the cooling liquid in the second cooling flow channel (201) is water, and the cooling liquid in the first cooling flow channel is cooling oil.
14. A vehicle comprising a main drive motor, characterized in that,
the main drive motor is a motor as claimed in claim 12 or 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210277874.6A CN114598078A (en) | 2022-03-21 | 2022-03-21 | Motor rotor subassembly, motor, vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210277874.6A CN114598078A (en) | 2022-03-21 | 2022-03-21 | Motor rotor subassembly, motor, vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114598078A true CN114598078A (en) | 2022-06-07 |
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ID=81811324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210277874.6A Pending CN114598078A (en) | 2022-03-21 | 2022-03-21 | Motor rotor subassembly, motor, vehicle |
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| Country | Link |
|---|---|
| CN (1) | CN114598078A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4398461A1 (en) * | 2023-01-09 | 2024-07-10 | Delta Electronics, Inc. | Rotor cooling structure of a motor |
| CN118713350A (en) * | 2024-08-29 | 2024-09-27 | 西安科技大学 | Motor with rotor heat dissipation structure and mounting method thereof |
-
2022
- 2022-03-21 CN CN202210277874.6A patent/CN114598078A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4398461A1 (en) * | 2023-01-09 | 2024-07-10 | Delta Electronics, Inc. | Rotor cooling structure of a motor |
| CN118713350A (en) * | 2024-08-29 | 2024-09-27 | 西安科技大学 | Motor with rotor heat dissipation structure and mounting method thereof |
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