CN109951024B - Stator reaches motor including it - Google Patents
Stator reaches motor including it Download PDFInfo
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- CN109951024B CN109951024B CN201910303694.9A CN201910303694A CN109951024B CN 109951024 B CN109951024 B CN 109951024B CN 201910303694 A CN201910303694 A CN 201910303694A CN 109951024 B CN109951024 B CN 109951024B
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- 238000001816 cooling Methods 0.000 claims abstract description 217
- 238000004804 winding Methods 0.000 claims abstract description 79
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000012809 cooling fluid Substances 0.000 claims 2
- 239000012530 fluid Substances 0.000 claims 1
- 125000006850 spacer group Chemical group 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000110 cooling liquid Substances 0.000 description 29
- 239000002826 coolant Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000004323 axial length Effects 0.000 description 3
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- 238000009413 insulation Methods 0.000 description 3
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- 238000007598 dipping method Methods 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
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- 210000001611 motor endplate Anatomy 0.000 description 1
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- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses a stator and a motor comprising the same, wherein the stator comprises a stator core and stator windings, the stator core comprises a plurality of stator teeth and a plurality of stator slots, the two stator windings are respectively wound on the two adjacent stator teeth along the circumferential direction of the stator, a first gap is arranged between the two stator windings in at least one stator slot, the stator further comprises a liquid cooling device, the liquid cooling device comprises a liquid cooling pipe, the liquid cooling pipe comprises a cooling section, a liquid inlet section and a liquid outlet section, and at least one part of the cooling section is arranged in the first gap. According to the invention, the cooling section of the liquid cooling pipe is arranged in the stator slot and close to the stator winding, so that the contact area between the cooling section and the stator winding is increased, and the liquid cooling efficiency of the motor is improved. The liquid cooling pipes in the stator slots are connected in series and integrally formed, so that the number of joints is reduced. Meanwhile, the internal space of the stator is fully utilized, part of the liquid cooling device is arranged in the stator, and the restriction of the motor space on the liquid cooling device is reduced, so that the production cost is reduced, and the feasibility of the layout of the liquid cooling device is improved.
Description
Technical Field
The invention relates to a stator and a motor comprising the same.
Background
During operation of the machine, ohmic resistance and ferromagnetic hysteresis generate heat on the stator windings and core, which needs to be dissipated by cooling devices, otherwise the machine may fail in multiple modes. The aging of stator winding insulation can be accelerated by the excessively high motor temperature, and finally, insulation damage and abnormal work of the motor are caused. According to experience, the insulation life of the stator winding is shortened by half every time the temperature rise of the stator winding is improved by 10 ℃. On the other hand, the temperature rise of the stator winding will cause the resistance of the stator winding to be increased, the heat generation of the motor is increased in a square relation, and the efficiency of the motor is reduced. Therefore, the control of the motor temperature rise within the limit value and the reduction of the motor temperature rise as far as possible have great significance for the normal operation and the efficient operation of the motor. For a permanent magnet motor, heat generated by a stator winding can be transferred to a permanent magnet through an air gap so as to raise the temperature of the permanent magnet, and the permanent magnet is irreversibly demagnetized due to overhigh temperature, so that a series of problems of motor power reduction, unbalance and the like are further caused. Only when the heat generated by the stator winding is timely dissipated through a reasonable method and the temperature of the stator winding is reduced, the irreversible demagnetization of the permanent magnet caused by high temperature can be effectively avoided.
The existing small-sized motor almost adopts an air cooling motor. The small-sized motor has small heat generation amount, but the ratio of the heat generation amount to the heat dissipation area is large, so that the cooling efficiency is low, but the cooling requirement is often sufficiently met. Under the condition, the air cooling mode can fully exert the characteristics of easy realization, strong reliability, basic maintenance free and the like. However, the feasibility of air cooling for large motors is often low due to low efficiency, large volume and high overall cost. Therefore, many large electric machines are cooled using liquid cooling. The liquid cooling of the motor has various forms and various layouts, for example, a cooling liquid pipeline is positioned in a water jacket of a shell, the cooling liquid pipeline is positioned in a water jacket of a yoke part of a stator core, and the water cooling of the cooling liquid passing through the inside of a lead of a stator winding is carried out. Different liquid cooling methods have different cooling efficiencies, and therefore, one challenge of liquid cooling design lies in that a proper liquid cooling method and reasonable cooling arrangement are adopted to improve the cooling efficiency. On the other hand, the liquid cooling pipeline and the equipment are often restricted by the motor space, which becomes a main reason for higher liquid cooling cost. Therefore, on the premise of not influencing the reliability, the liquid cooling pipelines and the equipment are reasonably arranged by reasonably utilizing the internal space of the motor, and the method is a way for enhancing the feasibility of liquid cooling.
Disclosure of Invention
The invention aims to overcome the defects of low feasibility and high cost of a liquid cooling device of a motor stator in the prior art due to space layout, and provides a stator and a motor comprising the same.
The invention solves the technical problems through the following technical scheme:
a stator comprises a stator core and a stator winding, wherein the stator core is formed by stacking a plurality of tooth-shaped silicon steel sheets, the stator core comprises a plurality of stator teeth and a plurality of stator slots, two stator windings are respectively wound on the two adjacent stator teeth along the circumferential direction of the stator, each part of the two adjacent stator windings along the circumferential direction of the stator is loaded in any one of the stator slots, a first gap is arranged between the two stator windings in at least one of the stator slots, it is characterized in that the stator also comprises a liquid cooling device, the liquid cooling device comprises a liquid cooling pipe, the liquid cooling pipe comprises a cooling section, a liquid inlet section and a liquid outlet section, the cooling section is connected and communicated with the liquid inlet section, the cooling section is connected and communicated with the liquid outlet section, and at least one part of the cooling section is arranged in the first gap.
In this scheme, the stator adopts double-deck centralized stator winding structure, arranges the cooling segment of liquid cooling pipe in the stator slot and presses close to stator winding, and is fixed through frictional force between cooling segment and the stator winding. The cooling liquid flows in the liquid cooling pipe, and the stator iron core and the stator winding are cooled. The position of the cooling section is set to fully utilize the space between the stator windings and reduce the restriction of the motor space on the liquid cooling pipe, thereby reducing the production cost and improving the feasibility of the layout of the liquid cooling device; on the other hand, the contact area between the cooling section and the stator winding is increased, and the liquid cooling efficiency of the motor is improved.
Preferably, the cooling sections are at least arranged in two first gaps adjacent to each other in the circumferential direction of the stator, and the liquid cooling pipe further includes a connecting section for connecting the cooling sections in the two adjacent first gaps.
In this scheme, the cooling section in the at least two adjacent first spaces is connected, can reduce the quantity of joints such as feed liquor section and play liquid section in the cooling circuit, reduces the quantity and the welding number of times that set up the insulating apparatus at feed liquor section entry and play liquid section exit to reduce cost, reduce the fault point, increase liquid cooling reliability.
Preferably, the liquid inlet section and the liquid outlet section are parallel to the radial direction of the stator, and a part of the liquid inlet section and a part of the liquid outlet section are arranged in the first gap.
In this scheme, the feed liquor section is radially with going out the liquid section and being on a parallel with the stator to the inner space that the stator can be utilized in the position setting of feed liquor section and play liquid section reduces the restraint in motor space, improves the feasibility of liquid cooling device overall arrangement.
Preferably, the stator core includes at least one row of radial channels formed by discontinuously stacking the silicon steel sheets, and a support structure is disposed in the radial channels.
In this scheme, radial passage is used for making the feed liquor section can radially pass stator core with play liquid section along the stator to partial liquid cooling is equipped and can be set up the stator inner space, through make full use of stator inner space, with the restraint that reduces motor space, improves the feasibility of liquid cooling device overall arrangement.
Preferably, the number of radial channels is one.
In the scheme, the more the number of the radial channels is, the longer the length of the stator along the axial direction is, the more the internal space of the motor is occupied, so that the number of the radial channels is reduced as much as possible to reduce the occupied space of the stator in the motor.
Preferably, the support structure includes a support slot plate, and along the axial direction of the stator, both ends of the support slot plate are connected with the silicon steel sheets at both ends of the radial channel respectively, and the support slot plate includes a support bottom plate and a support rib, and the support rib is arranged on the support bottom plate.
Preferably, along the axial direction of the stator, the height of the support rib is greater than the height of the liquid inlet section and the height of the liquid outlet section, and the liquid inlet section and the liquid outlet section penetrate through the radial passage and are used for arranging a part of the liquid cooling device in the inner area of the stator.
In this scheme, the high needs of brace rod satisfy the feed liquor section or go out the liquid section and can radially pass radial passageway along the stator.
Preferably, the cross-sectional shape of the liquid-cooled tube is a quadrangle, and at least two faces of the liquid-cooled tube are engaged with the stator winding or the stator core.
In this scheme, the liquid cooling pipe is established to the area of contact that can increase liquid cooling pipe and stator winding for tetragonal cross section to improve liquid cooling efficiency.
Preferably, the cooling section comprises a plurality of ducts parallel to the axial direction of the stator.
In this solution, the main flow direction of the cooling liquid in the cooling section is parallel to the stator axial direction.
Preferably, the cooling section is of a coil structure, and the bent parts of the cooling section are arranged at two ends of the cooling section along the axial direction of the stator.
In this scheme, the flow path of coolant liquid in the coil pipe is greater than the flow path of coolant liquid in single straight tube, and the heat that stator core and stator winding produced is fully absorbed to the coolant liquid of being convenient for, improves liquid cooling efficiency.
Preferably, a bottom cushion block is arranged at the bottom of the stator slot and used for filling a second gap between the liquid cooling pipe and the bottom of the stator slot.
In the scheme, the region between the liquid cooling pipe and the bottom of the stator slot is filled with the bottom cushion block, so that the stability of fixing the liquid cooling pipe is improved.
Preferably, the cooling section is of a structure with a plurality of parallel straight pipes.
In this scheme, the coolant liquid can flow in many straight tubes simultaneously for cooling rate improves cooling efficiency.
Preferably, the cooling liquid in the liquid-cooling pipe is an insulating liquid, and the electrical conductivity of the cooling liquid in the liquid-cooling pipe is less than 5.0 [ mu ] S/cm at 25 ℃.
In this scheme, the conductivity of coolant liquid is less, is difficult to block up the liquid-cooled pipe, can increase the life of liquid-cooled pipe.
Preferably, an isolation gasket strip is arranged between the stator winding and the liquid cooling pipe along the circumferential direction of the stator; the length of the insulating strips is equal to the length of the stator winding in the radial direction of the stator.
In the scheme, the isolation filler strip is used for reducing the abrasion between the liquid cooling pipe and the stator winding.
Preferably, the feed liquor section is equipped with the inlet, it is equipped with the liquid outlet to go out the liquid section, the liquid cooling device still includes the diversion subassembly and converges the subassembly, the feed liquor section with it passes through respectively to go out the liquid section the inlet with the liquid outlet realize with the diversion subassembly with converge the subassembly intercommunication.
Preferably, the water diversion assembly and the confluence assembly are arranged in the inner area of the stator core.
In this scheme, diversion subassembly and the subassembly that converges make full use of stator inner space have reduced the space constraint of motor.
Preferably, the water diversion assembly comprises a first water diversion pipe and a second water diversion pipe, one end of the first water diversion pipe is connected and communicated with the liquid inlet, and one end of the second water diversion pipe is connected and communicated with the liquid outlet.
In this scheme, first leading water pipe is used for introducing the coolant liquid cooling pipe, and the coolant liquid flows the back through the liquid cooling pipe, flows into second leading water pipe by the liquid outlet.
Preferably, the first and second penstock pipes are provided with insulating means.
In this scheme, insulating device has improved the security of liquid cooling device.
Preferably, the confluence assembly comprises a first confluence pipe and a second confluence pipe, the first confluence pipe is connected and communicated with the other end of the first water diversion pipe, and the second confluence pipe is connected and communicated with the other end of the second water diversion pipe.
In the scheme, the cooling liquid in the first collecting pipe enters the liquid cooling pipe through the first water diversion pipe and flows in the liquid cooling pipe to cool the stator core and the stator winding. The cooling liquid gradually becomes hot, and finally enters the second collecting pipe through the second water conduit from the liquid outlet of the liquid cooling pipe.
An electric machine, characterized in that it comprises a stator as described above.
The positive progress effects of the invention are as follows: the cooling section of the liquid cooling pipe is arranged in the stator slot and close to the stator winding, and the cooling section and the stator winding are fixed through friction. The cooling liquid flows in the liquid cooling pipe, and the stator iron core and the stator winding are cooled. The position of the cooling section is set to fully utilize the space between the stator windings and reduce the restriction of the motor space on the liquid cooling pipe, thereby reducing the production cost and improving the feasibility of the layout of the liquid cooling device; on the other hand, the contact area between the cooling section and the stator winding is increased, and the liquid cooling efficiency of the motor is improved. Radial channels are arranged in the liquid inlet and outlet sections in a penetrating mode, so that part of the cooling device can be arranged in the stator, the inner space of the stator is fully utilized, the constraint of the motor space is reduced, and the feasibility of the layout of the liquid cooling device is improved. The cooling sections in the first gaps are connected, so that the number of joints such as the liquid inlet section and the liquid outlet section in the cooling loop can be reduced, the number of insulating devices arranged at the inlet of the liquid inlet section and the outlet of the liquid outlet section and the welding frequency are reduced, the cost is reduced, the fault points are reduced, and the reliability of liquid cooling is improved.
Drawings
Fig. 1 is a schematic perspective view of a motor stator according to embodiment 1 of the present invention.
Fig. 2 is a schematic perspective view of another position state of the motor stator according to embodiment 1 of the present invention.
Fig. 3 is a schematic perspective view of a stator core and a liquid cooling tube according to embodiment 1 of the present invention.
Fig. 4 is a schematic structural view of a radial section of a stator in embodiment 1 of the present invention.
Fig. 5 is a schematic perspective view of a stator core and a liquid cooling tube according to embodiment 2 of the present invention.
Description of reference numerals:
10 stator core
101 stator teeth
102 stator slot
103 radial channel
104 support trough plate
1041 supporting baseplate
1042 support rib
20 stator winding
30 slot wedge
40 liquid cooling pipe
401 cooling section
402 liquid inlet section
4021 liquid inlet
403 liquid outlet section
4031 liquid outlet
404 connecting segment
50 diversion subassembly
501 first water conduit
502 second water conduit
503 insulating device
60 bus bar assembly
601 first collecting pipe
602 second manifold
70 first gap
80 second gap
90 isolation filler strip
100 groove bottom block
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The invention relates to a stator in an electric machine, as shown in fig. 1-4, the stator comprises a stator core 10, a stator winding 20, a slot wedge 30 and a liquid cooling device. The stator core 10 is formed by stacking a plurality of slot-shaped silicon steel sheets, the stator core 10 includes a plurality of stator teeth 101 and a plurality of stator slots 102, two stator windings 20 are respectively wound on two adjacent stator teeth 101 along the circumferential direction of the stator, each part of the two adjacent stator windings 20 along the circumferential direction of the stator is loaded in any one of the stator slots 102, and a first gap 70 is arranged between the two stator windings 20 in one of the stator slots 102. Because the internal structures of different motors are different, the first gap 70 is not provided between the two stator windings 20 in any one stator slot 102, and the first gap 70 is provided between the two stator windings 20 in at least one stator slot 102.
The liquid cooling device comprises a liquid cooling pipe 40, and the liquid cooling pipe 40 comprises a cooling section 401, a liquid inlet section 402 and a liquid outlet section 403. The liquid cooling pipe 40 is made of metal with good pressure resistance and corrosion resistance, such as stainless steel and copper, the cooling section 401 is arranged in the first gap 70, the cooling section 401 is connected and communicated with the liquid inlet section 402, and the cooling section 401 is also connected and communicated with the liquid outlet section 403. The height of the cooling segment 401 is greater than the height of the stator core 10 in the axial direction of the stator; the length of the cooling section 401 is equal to the length of the stator winding 20 in the radial direction of the stator. The two ends of the cooling section 401 along the axial direction of the stator slightly exceed the stator core 10, so that the stator core 10 and the stator winding 20 can be uniformly cooled, the contact area of the liquid cooling pipe 40 and the stator winding 20 is increased, and the liquid cooling efficiency is improved. In other alternative embodiments, the size of the cooling section 401 is not limited to the above requirement, and may be adjusted according to actual requirements, so as to ensure that at least a portion of the cooling section 401 is disposed in the first gap 70. The slot wedge 30 is disposed on the top of the stator slot 102 and engaged with the top of the stator teeth 101 for fixing the stator winding 20 and the liquid cooling tube 40, further improving the stability of fixing the liquid cooling tube 40, and enabling the stator winding 20 and the liquid cooling tube 40 to work stably without affecting other components in the motor.
The stator adopts double-layer centralized stator winding 20 structure, the cooling section 401 of the liquid cooling pipe 40 is arranged in the stator slot 102 and close to the stator winding 20, the liquid cooling pipe 40 and the stator winding 20 are in interference fit, and the liquid cooling pipe 40 and the stator winding 20 are fixed by means of friction. The cooling liquid flows in the liquid cooling pipe 40, and cools the stator core 10 and the stator winding 20. The cooling section 401 is arranged to fully utilize the space between the stator windings 20 and reduce the restriction of the motor space on the liquid cooling pipe 40, so that the production cost is reduced and the feasibility of the layout of the liquid cooling device is improved; on the other hand, the contact area between the cooling section 401 and the stator winding 20 is increased, and the liquid cooling efficiency of the motor is improved.
The cooling sections 401 in the two adjacent first gaps 70 in the circumferential direction of the stator are connected and communicated through the connecting section 404, the two communicated cooling sections 401 are integrally formed, and the connecting section 404 is of an arc-shaped pipe structure, so that cooling liquid can conveniently flow. The connection section 404 is provided at the outermost side of the cooling section 401 in the radial direction of the stator, and at a portion of the cooling section 401 higher than the stator core 10 in the axial direction of the stator, to form a complete pipe for facilitating the flow of the cooling liquid. The cooling sections 401 in the two adjacent first gaps 70 are connected and integrally formed, so that the number of joints of the liquid inlet section 402, the liquid outlet section 403 and the like in the cooling loop can be reduced, and the number and welding times of the insulating devices 503 arranged at the inlet of the liquid inlet section 402 and the outlet of the liquid outlet section 403 are reduced, so that the cost is reduced, the fault points are reduced, and the liquid cooling reliability is improved.
In other alternative embodiments, the cooling sections 401 in two adjacent first gaps 70 in the circumferential direction of the stator are not limited to be connected and communicated, the cooling section 401 in each first gap 70 may be provided with the liquid inlet section 402 and the liquid outlet section 403 separately, or a plurality of cooling sections 401 adjacent in the circumferential direction of the stator may be connected and communicated. The two communicated liquid cooling pipes 40 are not limited to be integrally formed, and can also be formed by splicing a plurality of sections of liquid cooling pipes 40, so that the splicing reliability needs to be noticed, and the coolant in the pipes can not be leaked. The setting position and shape of the connection section 404 are not limited to the above requirements, and the connection section can be set at different positions according to the layout of the actual liquid cooling device, so that the liquid cooling efficiency of the motor is ensured, and meanwhile, the installation and maintenance are convenient, and the internal crowding of the motor is reduced.
The liquid inlet section 402 and the liquid outlet section 403 are parallel to the radial direction of the stator, and a part of the liquid inlet section 402 and a part of the liquid outlet section 403 are arranged in the first gap 70. The stator core 10 comprises a row of radial channels 103 formed by discontinuously stacking silicon steel sheets, and is used for enabling the liquid inlet section 402 and the liquid outlet section 403 to penetrate through the stator core 10 along the radial direction of the stator, and a support structure is arranged in the radial channels 103. The supporting structure includes a supporting slot plate 104, along the axial direction of the stator, two ends of the supporting slot plate 104 are respectively connected with the silicon steel sheets at two ends of the radial channel 103, the supporting slot plate 104 includes a supporting base plate 1041 and supporting ribs 1042, and the supporting ribs 1042 are disposed on the supporting base plate 1041. The liquid inlet section 402 and the liquid outlet section 403 penetrate through the radial channel 103, so that a part of the liquid cooling device can be arranged in the inner area of the stator, the restriction of the motor space is reduced, and the feasibility of the layout of the liquid cooling device is improved. In order to facilitate the penetration, the height of the radial channel 103 is equal to or slightly greater than the height of the liquid inlet section 402 and the liquid outlet section 403 along the axial direction of the stator, and the height of the radial channel 103 should not be too high, so as to avoid the problem that the axial length of the stator is too long and occupies more space of the motor, which causes the internal congestion of the motor. In other alternative embodiments, the radial passages 103 are not limited to one row, and multiple rows of radial passages 103 may be provided, but the number of radial passages 103 should be minimized to reduce the axial length of the stator and reduce the space occupied by the stator.
The cross-sectional shape of the liquid cooling tube 40 is rectangular, and at least two surfaces of the liquid cooling tube 40 are jointed with the stator winding 20 or the stator core 10, so that the contact area of the liquid cooling tube 40 and the stator winding 20 can be increased, and the liquid cooling efficiency is improved. In alternative embodiments, the cross-sectional shape of the liquid cooling may be other quadrilateral or non-quadrilateral, which is desirable for easy installation while ensuring the efficiency of the liquid cooling of the motor.
The cooling section 401 comprises a plurality of pipes parallel to the axial direction of the stator, and the main flow direction of the cooling liquid in the cooling section 401 is parallel to the stator axial direction. The cooling section 401 adopts a coil pipe structure with even number of turns, and the bending part of the cooling section 401 is arranged at two ends of the cooling section 401 along the axial direction of the stator, so that the liquid inlet section 402 and the liquid outlet section 403 can both penetrate through the radial channel 103. The flow path of the cooling liquid in the coil pipe is larger than that of the cooling liquid in a single straight pipe, so that the cooling liquid can fully absorb heat generated by the stator core 10 and the stator winding 20, and the liquid cooling efficiency is improved. In other alternative embodiments, the cooling section 401 may also be a straight pipe structure, which is required to ensure sufficient liquid cooling efficiency and to facilitate installation and reasonable layout.
The inlet section 402 and the outlet section 403 are arranged parallel to the radial direction of the stator and perpendicular to the main flow direction of the cooling liquid in the liquid cooling pipes 40, so that a second interspace 80 exists between the bottom of the stator slot 102 and the liquid cooling pipes 40 in the radial direction of the stator. In order to ensure the stability of the fixation of the liquid cooling tube 40, the bottom of the stator slot 102 is provided with a slot bottom block 100 for filling the second gap 80 between the liquid cooling tube 40 and the bottom of the stator slot 102, so that the stability of the fixation of the liquid cooling tube 40 is improved.
The cooling liquid in the liquid cooling pipe 40 is an insulating liquid, and the electric conductivity of the cooling liquid in the liquid cooling pipe 40 is less than 5.0 mu S/cm at 25 ℃. The conductivity of the cooling liquid is low, the liquid cooling pipe 40 is not easy to block, and the service life of the liquid cooling pipe 40 can be prolonged.
In order to reduce the wear between the cooling section 401 and the stator winding 20, an isolation pad 90 is disposed between the stator winding 20 and the cooling section 401 along the circumferential direction of the stator, the length of the isolation pad 90 along the radial direction of the stator is equal to the length of the stator winding 20 along the radial direction of the stator, and the thickness of the isolation pad 90 should be a small value, for example, 1mm, to reduce the thermal resistance between the cooling section 401 and the stator winding 20 on the premise of ensuring that the wear between the cooling section 401 and the stator winding 20 is reduced. Because the cooling section 401 and the stator winding 20 are in interference fit, when the stator is assembled, the stator winding 20 is wound on the stator core 10, then the isolation gasket is installed, and then the liquid cooling pipe 40 is installed, and the three are mutually fixed by friction force.
The liquid inlet section 402 is provided with a liquid inlet 4021, the liquid outlet section 403 is provided with a liquid outlet 4031, the liquid cooling device further comprises a water diversion assembly 50 and a confluence assembly 60, and the liquid inlet section 402 and the liquid outlet section 403 are communicated with the water diversion assembly 50 and the confluence assembly 60 through the liquid inlet 4021 and the liquid outlet 4031 respectively. The water drawing assembly 50 and the bus bar assembly 60 are provided in an inner region of the stator core 10. The water diversion assembly 50 and the confluence assembly 60 make full use of the internal space of the stator, and reduce the space constraint of the motor.
The water diversion assembly 50 comprises a first water diversion pipe 501 and a second water diversion pipe 502, wherein one end of the first water diversion pipe 501 is connected and communicated with the liquid inlet 4021, and one end of the second water diversion pipe 502 is connected and communicated with the liquid outlet 4031. The first water conduit 501 and the second water conduit 502 are both provided with the insulating device 503, and the insulating device 503 improves the safety of the liquid cooling device and prevents electric leakage and other phenomena in the use process. The manifold assembly 60 includes a first manifold 601 and a second manifold 602, the first manifold 601 being connected to and communicating with the other end of the first penstock 501, and the second manifold 602 being connected to and communicating with the other end of the second penstock 502. The connection of the priming assembly 50 to the liquid cooled tube 40 and the connection of the priming assembly 50 to the manifold assembly 60 may be accomplished by any means known to those skilled in the art, such as welding, clamping, etc. The structure of the insulating device 503 and the connection manner between the insulating device and the first water conduit 501 and the second water conduit 502 in this embodiment are the prior art in the art, and are not described herein.
After the liquid cooling pipe 40 is completely assembled and fixed with the stator core 10, the stator winding 20 and the slot wedge 30, the stator after assembly is subjected to paint dipping treatment, so that the liquid cooling pipe 40 can be fully contacted with the stator core 10 and the stator winding 20, and the liquid cooling efficiency is improved. The operation of paint dipping in this embodiment is the prior art, and is not described herein.
This embodiment adopts the motor structure of inner stator, outer rotor, and consequently the stator inner space is comparatively broad, can place diversion subassembly 50 and converge subassembly 60 etc. except that the subassembly of liquid cooling device of liquid cooling pipe 40, avoids installing these subassemblies on other regions of motor insides such as motor end plate, has not only reduced the crowded condition of motor, has still reduced the installation degree of difficulty of liquid cooling device simultaneously, reduces manufacturing cost.
The cooling liquid flows to the first water conduit 501 from the first collecting pipe 601, then is introduced into the cooling section 401 from the liquid inlet 4021 of the liquid inlet section 402 through the first water conduit 501, the cooling liquid flows in the cooling section 401, so that the temperatures of the stator core 10 and the stator winding 20 are reduced, the temperature of the cooling liquid is gradually increased, the cooling liquid flows to the second water conduit 502 from the liquid outlet 4031 of the liquid outlet section 403, and then is introduced into the second collecting pipe 602 through the second water conduit 502, thereby completing primary cooling, the cooling process is repeated, the stator core 10 and the stator winding 20 are continuously cooled, the temperature of the stator core 10 and the temperature of the stator winding 20 are kept not too high, and the service life of the stator is influenced. The cooling liquid is insulating liquid, the flow velocity is generally not more than 3m/s, the stator core 10 and the stator winding 20 can be effectively cooled, and when the flow velocity is 1m/s, the cooling effect is better. The main flow direction of the cooling liquid in the cooling section 401 is parallel to the axial direction of the stator, because the axial length of the stator is greater than the radial length of the stator slot 102, the cooling pipe adopts a coil pipe structure, the number of turns of the coil pipe can be reduced when the cooling liquid flows along the axial direction of the stator, and therefore the loss of the cooling liquid in the flowing process is reduced.
Example 2
The structure of this embodiment is substantially the same as that of embodiment 1, except that the structure of the cooling zone 401 is different.
As shown in the figure, cooling section 401 adopts many parallelly connected straight tube structures, and after the coolant liquid got into cooling section 401 by feed liquor section 402, simultaneously flowed to stator core 10's both ends, and the coolant liquid can flow in many straight tubes simultaneously for cooling rate improves cooling efficiency.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (19)
1. A stator comprises a stator core and a stator winding, wherein the stator core is formed by stacking a plurality of tooth-shaped silicon steel sheets, the stator core comprises a plurality of stator teeth and a plurality of stator slots, two stator windings are respectively wound on the two adjacent stator teeth along the circumferential direction of the stator, each part of the two adjacent stator windings along the circumferential direction of the stator is loaded in any one of the stator slots, a first gap is arranged between the two stator windings in at least one of the stator slots, it is characterized in that the stator also comprises a liquid cooling device, the liquid cooling device comprises a liquid cooling pipe, the liquid cooling pipe comprises a cooling section, a liquid inlet section and a liquid outlet section, the cooling section is connected and communicated with the liquid inlet section, the cooling section is connected and communicated with the liquid outlet section, and at least one part of the cooling section is arranged in the first gap;
the liquid inlet section and the liquid outlet section are parallel to the radial direction of the stator, and a part of the liquid inlet section and a part of the liquid outlet section are arranged in the first gap; the stator core comprises at least one row of radial channels formed by discontinuously stacking silicon steel sheets, and the liquid inlet section and the liquid outlet section are arranged in the radial channels in a penetrating mode and used for enabling a part of the liquid cooling device to be arranged in the inner area of the stator.
2. The stator according to claim 1, wherein the cooling segments are disposed at least in two first gaps adjacent in a circumferential direction of the stator, and the liquid-cooled tube further comprises a connecting segment connecting the cooling segments in the two adjacent first gaps.
3. The stator of claim 1 wherein a support structure is provided within the radial passage.
4. A stator according to claim 3, wherein the number of radial channels is one.
5. The stator according to claim 3, wherein the supporting structure comprises a supporting slot plate, two ends of the supporting slot plate are respectively connected with the silicon steel sheets at two ends of the radial channel along the axial direction of the stator, the supporting slot plate comprises a supporting bottom plate and supporting ribs, and the supporting ribs are arranged on the supporting bottom plate.
6. The stator as claimed in claim 5, wherein the height of the support rib is greater than the height of the liquid inlet section and the height of the liquid outlet section along the axial direction of the stator.
7. The stator according to claim 1, wherein the cross-sectional shape of the liquid-cooled tube is a quadrangle, and at least two faces of the liquid-cooled tube are engaged with the stator winding or the stator core.
8. The stator of claim 1, wherein the cooling segment comprises a plurality of tubes parallel to an axial direction of the stator.
9. The stator according to claim 8, wherein the cooling section is a coil structure, and the bent portions of the cooling section are provided at both ends of the cooling section in the axial direction of the stator.
10. The stator of claim 9, wherein the bottom of the stator slot is provided with a slot bottom pad for filling a second gap between the liquid cooled tube and the bottom of the stator slot.
11. The stator as claimed in claim 8 wherein said cooling section is a plurality of parallel straight tube structures.
12. The stator of claim 1, wherein the cooling fluid in the fluid-cooled tube is an insulating fluid and the electrical conductivity of the cooling fluid in the fluid-cooled tube is less than 5.0 μ S/cm at 25 ℃.
13. The stator according to claim 1, wherein an isolation spacer is provided between the stator winding and the liquid cooling pipe in a circumferential direction of the stator; the length of the insulating strips is equal to the length of the stator winding in the radial direction of the stator.
14. The stator of claim 1, wherein the liquid inlet section is provided with a liquid inlet, the liquid outlet section is provided with a liquid outlet, the liquid cooling device further comprises a water diversion assembly and a confluence assembly, and the liquid inlet section and the liquid outlet section are communicated with the water diversion assembly and the confluence assembly through the liquid inlet and the liquid outlet respectively.
15. The stator of claim 14 wherein the water directing assembly and the bus bar assembly are disposed in an interior region of the stator core.
16. The stator as claimed in claim 14 wherein the water diversion assembly includes a first water diversion pipe and a second water diversion pipe, the first water diversion pipe having one end connected to and communicating with the liquid inlet and the second water diversion pipe having one end connected to and communicating with the liquid outlet.
17. The stator as claimed in claim 16 wherein said first water conduit and said second water conduit are each provided with insulating means.
18. The stator of claim 16, wherein the manifold assembly includes a first manifold connected to and in communication with the other end of the first penstock and a second manifold connected to and in communication with the other end of the second penstock.
19. An electrical machine, characterized in that the electrical machine comprises a stator according to any of claims 1-18.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910303694.9A CN109951024B (en) | 2019-04-16 | 2019-04-16 | Stator reaches motor including it |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910303694.9A CN109951024B (en) | 2019-04-16 | 2019-04-16 | Stator reaches motor including it |
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| CN109951024A CN109951024A (en) | 2019-06-28 |
| CN109951024B true CN109951024B (en) | 2020-07-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110350688B (en) * | 2019-07-18 | 2020-06-12 | 浙江大学 | Stator and motor comprising same |
| CN113300506A (en) * | 2021-05-28 | 2021-08-24 | 上海大学 | Slot wedge type in-slot liquid cooling motor |
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| US6304011B1 (en) * | 1996-08-09 | 2001-10-16 | The Turbo Genset Company Limited | Rotary electrical machines |
| JP2006014564A (en) * | 2004-06-29 | 2006-01-12 | Nissan Motor Co Ltd | Stator cooling structure for disc-shaped rotary electric machine |
| CN100488006C (en) * | 1999-10-28 | 2009-05-13 | 沙迪克株式会社 | Linear motor coil assembly and method for manufacturing the same |
| CN101728897A (en) * | 2008-10-28 | 2010-06-09 | 西门子公司 | Arrangement for cooling of an electrical machine |
| CN103296836A (en) * | 2013-06-04 | 2013-09-11 | 北京交通大学 | Circumferential radial multipath oil cooling system for high-speed motor |
| CN107276266A (en) * | 2017-08-02 | 2017-10-20 | 华中科技大学 | A kind of two-way cooling oil-cooled motor |
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2019
- 2019-04-16 CN CN201910303694.9A patent/CN109951024B/en active Active
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|---|---|---|---|---|
| US6304011B1 (en) * | 1996-08-09 | 2001-10-16 | The Turbo Genset Company Limited | Rotary electrical machines |
| CN100488006C (en) * | 1999-10-28 | 2009-05-13 | 沙迪克株式会社 | Linear motor coil assembly and method for manufacturing the same |
| JP2006014564A (en) * | 2004-06-29 | 2006-01-12 | Nissan Motor Co Ltd | Stator cooling structure for disc-shaped rotary electric machine |
| CN101728897A (en) * | 2008-10-28 | 2010-06-09 | 西门子公司 | Arrangement for cooling of an electrical machine |
| CN103296836A (en) * | 2013-06-04 | 2013-09-11 | 北京交通大学 | Circumferential radial multipath oil cooling system for high-speed motor |
| CN107276266A (en) * | 2017-08-02 | 2017-10-20 | 华中科技大学 | A kind of two-way cooling oil-cooled motor |
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Address after: 310058 Xihu District, Zhejiang, Yuhang Tong Road, No. 866, No. Applicant after: Zhejiang University Applicant after: Shanghai Electric Wind Power Group Co., Ltd Address before: 310058 Xihu District, Zhejiang, Yuhang Tong Road, No. 866, No. Applicant before: Zhejiang University Applicant before: Shanghai Electric Wind Power Group Co., Ltd. |
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