Slot cooled stator

Abstract

The utility model provides a slot cooled stator. The slot cooling stator comprises a stator core (100), a conductor (200) and insulation paper (300). The stator core (100) includes a plurality of stator slots (110). And a plurality of conductors (200) are arranged in one stator slot (110). The insulation paper (300) surrounds and wraps the conductor (200), the insulation paper (300) comprises a main body part (310) and at least one first protruding part (320), the first protruding part (320) is formed on one side face (330) of the main body part (310), and the first protruding part (320) abuts against the conductor (200), so that a cooling oil channel (400) is formed between the main body part (310) and the conductor (200).

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, and relates to an electric machine as a power device in a pure electric vehicle or a hybrid vehicle, in particular to a slot-cooled stator in the electric machine. BACKGROUND

[0002] Compared with a water cooling scheme, cooling oil in an oil cooling scheme can directly contact heat generating parts in the electric machine, and therefore the oil cooling scheme has an advantage in electric machine cooling technology. In particular, for a slot-cooled stator that performs oil cooling on a stator slot, cooling oil can directly contact copper conductors in the stator slot and take away heat, greatly improving the continuous power of the electric machine, and having a good development prospect on high-performance vehicles.

[0003] As shown in CN109617319A and WO2022236776A1, the cross-sectional shape of the stator slot or the copper conductor can be changed, so that a gap is left between the copper conductor and the stator slot or between the copper conductors, to form a cooling oil channel. Cooling oil can enter from one end of the gap and flow out from the other end, directly taking away the heat generated by the copper conductor.

[0004] For the way of forming a cooling oil channel by changing the shape of the stator slot, the magnetic steel material in the stator slot needs to be removed, and a special and complex stamping die needs to be designed. In order to reduce the complexity and cost of the die, it is necessary to minimize the part of the material that needs to be removed, so that part or all of the copper conductors in the slot are tightly fitted, and then an oil channel is formed beside them. This will reduce the contact area between the copper conductor and the cooling oil, and reduce the cooling effect.

[0005] For the way of forming a cooling oil channel by changing the cross-sectional shape of the copper conductor, the manufacturing process of the copper conductor needs to be changed, and the parameters of the conductor manufacturing and winding need to be re-studied, which will increase the manufacturing difficulty and development cost of the copper conductor. Moreover, the process of manufacturing the copper conductor and forming the winding is easy to damage the paint layer, which brings quality risks. UTILITY MODEL CONTENT

[0006] In order to solve or alleviate at least one problem mentioned in the background, the present application provides a slot-cooled stator.

[0007] The slot-cooled stator comprises:

[0008] a stator core comprising a plurality of stator slots;

[0009] a plurality of conductors, each of the stator slots being provided with a plurality of the conductors;

[0010] a plurality of insulating papers, the insulating papers being wrapped around the conductors, the insulating papers comprising a main body part and at least one first protruding part, the first protruding part being formed on one side of the main body part, the first protruding part abutting against the conductors, so that a cooling oil channel is formed between the main body part and the conductors.

[0011] In at least one embodiment, the whole circumference of each conductor is wrapped with the insulating paper.

[0012] In at least one embodiment, the whole circumference of each conductor has a plurality of the first protrusions.

[0013] In at least one embodiment, the insulating paper further comprises at least one second protrusion formed on the other side of the main body, the second protrusion abuts against the slot wall of the stator slot and / or against another second protrusion and / or against the main body.

[0014] In at least one embodiment, the first protrusion is formed in a strip shape, and the length of the first protrusion in the axial direction of the stator core is greater than the axial length of the stator core.

[0015] In at least one embodiment, in one piece of the insulating paper, the area of the first protrusion is no more than 20% of the area of the one side of the insulating paper.

[0016] In at least one embodiment, the first protrusion is formed in a block shape, and the one side of the main body comprises a plurality of the first protrusions that are not connected.

[0017] In at least one embodiment, in one piece of the insulating paper, the area of the first protrusion is no more than 10% of the area of the one side of the insulating paper.

[0018] In at least one embodiment, the insulating paper is folded into a cross section of a sun shape, so that at least two conductors can be separated.

[0019] In at least one embodiment, two conductors have two layers of the main body therebetween, and the second protrusions on the two layers of the main body abut against or are staggered with each other in the radial direction of the stator core.

[0020] The application sets protrusions on the insulating paper, so that a cooling oil channel can be formed between the main body of the insulating paper and the conductor, and the cooling oil can directly contact the conductor to take away heat. Compared with changing the shape of the stator slot or the cross-sectional shape of the conductor, the technical solution of changing the shape of the insulating paper is simpler and has lower cost, and has a significant advantage in mass production. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A front view of a cross section of a stator core of a slot-cooled stator according to the first embodiment of the application is shown.

[0022] Figure 2A partial enlarged view of the stator core in Figure 1 is shown.

[0023] Figure 3 A partial enlarged view of the stator core in Figure 1 is shown.

[0024] Figure 4 A folding schematic of the insulating paper of the slot-cooled stator according to the first embodiment of the present application is shown, which is an axonometric view.

[0025] Figure 5 A folding schematic of the insulating paper of the slot-cooled stator according to the first embodiment of the present application is shown, which is an axonometric view.

[0026] Figure 6 A cross-sectional front view of the stator core of the slot-cooled stator according to the second embodiment of the present application is shown.

[0027] Figure 7 A partial enlarged view of the stator core in Figure 6 is shown.

[0028] Figure 8 A partial enlarged view of the stator core in Figure 6 is shown.

[0029] Figure 9 A folding schematic of the insulating paper of the slot-cooled stator according to the second embodiment of the present application is shown, which is an axonometric view.

[0030] Figure 10 A folding schematic of the insulating paper of the slot-cooled stator according to the second embodiment of the present application is shown, which is an axonometric view.

[0031] BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 100 stator core

[0033] 110 stator slot

[0034] 111 slot wall

[0035] 112 slot wedge

[0036] 200 conductor

[0037] 300 insulating paper

[0038] 310 main body portion

[0039] 320 first protruding portion

[0040] 330 one side surface

[0041] 340 second protruding portion

[0042] 350 another side surface

[0043] 400 cooling oil channel DETAILED DESCRIPTION

[0044] Exemplary embodiments of the present application are described herein with reference to the accompanying drawings. It should be understood that the specific illustrations are merely exemplary for teaching one of ordinary skill in the art how to implement the present application and should not be used to limit the scope of the present application in any way.

[0045] Embodiments of the present application provide a slot-cooled stator.

[0046] Referring to Figures 1 to 3 , the slot-cooled stator can include a stator core 100, a conductor 200, and an insulation paper 300.

[0047] The stator core 100 can include a plurality of stator slots 110, for example, the plurality of stator slots 110 can be arranged along a circumferential direction C of the stator core 100. A plurality of conductors 200 are arranged in one stator slot 110. The conductor 200 can be a wire with a substantially rectangular cross section, used to form a flat wire winding.

[0048] Referring to Figure 4 , Figure 5 , the insulation paper 300 can include a main body portion 310 and at least one first protruding portion 320 formed on one side surface 330 of the main body portion 310. Referring to Figure 2 , Figure 5 , the insulation paper 300 is wrapped around the conductor 200, for example, on a cross section of the stator core 100, the insulation paper 300 is wrapped around four surfaces of the conductor 200. The first protruding portion 320 abuts against the conductor 200, so that a cooling oil channel 400 is formed between the main body portion 310 and the conductor 200, so that the cooling oil can directly contact the conductor 200 and take away heat, achieving cooling.

[0049] The insulation paper 300 has good ductility and is easy to shape. Exemplarily, a groove can be arranged in a mold, and then the insulation paper 300 with the corresponding protruding portion is processed by, for example, rolling.

[0050] It should be understood that the present application does not need to change the cross-sectional shape of the conductor 200, and has no effect on the manufacturing and winding process of the conductor 200. No new process parameters need to be developed, saving process development costs. The present application does not need to change the slot shape of the laminations of the stator core 100, and the punching die is relatively simple, with lower mold cost.

[0051] Compared with changing the shape of the stator slot 110 or changing the cross-sectional shape of the conductor 200, changing the shape of the insulation paper 300 is simpler and has lower cost, and has a significant advantage in mass production.

[0052] In one embodiment, referring to Figure 2 In the radial direction R of the stator core 100, a plurality of conductors 200 are arranged side by side in one stator slot 110. For example, eight conductors can be arranged in one stator slot 110.

[0053] The entire circumference of each conductor 200 is wrapped with the insulating paper 300. It should be understood that, unlike the method of arranging a gap between two conductors as a cooling oil channel, the installation of the conductors 200 in the embodiment provided by the present application is more secure and less prone to misalignment.

[0054] For example, the stator core 100 can be an outer stator core, and the stator slot 110 can have a slot opening, in which a slot wedge 112 can be installed to press the conductors 200 (or the insulating paper 300 outside the conductors 200).

[0055] In one embodiment, referring to Figure 2 In the plane formed by the radial direction R and the circumferential direction C of the stator slot 110, the entire circumference of the conductor 200 has a plurality of first protrusions 320.

[0056] In this way, each surface of the conductor 200 can form a cooling oil channel 400 with the main body portion 310 of the insulating paper 300, and each surface can be directly contacted by the cooling oil, thereby increasing the heat exchange area and improving the cooling effect.

[0057] In one embodiment, referring to Figures 6 to 10 The insulating paper 300 can further include at least one second protrusion 340 formed on the other side surface 350 of the main body portion 310. For example, the positions of the first protrusion 320 and the second protrusion 340 can be symmetrical about the main body portion 310.

[0058] Referring to Figure 7 The second protrusion 340 can abut against the slot wall 111 of the stator slot 110 (here, the slot wall 111 includes the side walls on both sides in the circumferential direction of the stator slot 110, and also includes the radial end walls on the inner radial side or the outer radial side) and / or against another second protrusion 340. In this way, the cooling oil channel 400 can also be formed between the insulating paper 300 and the slot wall 111 of the stator slot 110, and between two insulating papers 300, thereby increasing the range of the cooling oil channel 400 and improving the oil cooling effect.

[0059] Of course, one or more second protrusions 340 can also abut against the main body portion 310 of the adjacent insulating paper 300. It should be understood that, when no second protrusion 340 is arranged on one main body portion 310, the second protrusion 340 on the adjacent main body portion 340 will directly abut against the main body portion 340.

[0060] In one embodiment, referring to Figure 3 、 Figure 4 , the first protrusions 320 are formed in a strip shape, and the length of the first protrusions 320 in the axial direction A of the stator core 100 is greater than the axial length of the stator core 100.

[0061] Further, in one sheet of the insulation paper 300, the area of the first protrusions 320 is no more than 20% of the area of the one side surface 330 of the stator slot 110. That is, the space occupied by the first protrusions 320 is not large, and the space of the cooling oil passage 400 defined thereby is relatively large.

[0062] In one embodiment, the first protrusions 320 are formed in a block shape (not shown in the drawings), and the one side surface 330 of the main body portion 310 includes a plurality of first protrusions 320 that are not connected. Of course, the other side surface 350 can also include a plurality of second protrusions 340 that are not connected.

[0063] Further, in one sheet of the insulation paper 300, the area of the first protrusions 320 is no more than 10% of the area of the one side surface 330 of the insulation paper 300.

[0064] Similarly, the second protrusions 340 can also be in a strip shape, can be a plurality of block shapes that are not connected, and the area can also be less than 20% or 10% of the area of the other side surface 350 of the insulation paper 300.

[0065] In one embodiment, referring to Figure 4 、 Figure 5 , the insulation paper 300 is folded such that the cross section of one sheet of the insulation paper 300 is formed in a sun shape, or a B shape, so that at least two conductors 200 can be separated. Of course, one sheet of the insulation paper 300 can also be wrapped around each conductor 300.

[0066] In one embodiment, referring to Figure 10 , there are two layers of the main body portion 310 between the two conductors 200, and the second protrusions 340 on the two layers of the main body portion 310 are in contact with or offset from each other in the radial direction R of the stator core 100. In the example of being in contact, the area of the cooling oil passage 400 defined between the two sheets of the insulation paper 300 is large.

[0067] The above describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A slot-cooled stator characterized by, The application relates to a stator core, comprising: a stator core comprising a plurality of stator slots; a plurality of conductors arranged in one of the stator slots; a plurality of insulating papers, each of which is wrapped around the conductors, the insulating paper comprising a main body and at least one first protruding part formed on one side of the main body, the first protruding part being in contact with the conductors so that a cooling oil channel is formed between the main body and the conductors.

2. The slotted cooling stator of claim 1, wherein, The entire circumference of each of the conductors is wrapped with the insulating paper.

3. The slotted cooling stator of claim 1, wherein, The entire circumference of each of the conductors has a plurality of the first protruding parts.

4. The slotted cooling stator of claim 1, wherein, The insulating paper further comprises at least one second protruding part formed on the other side of the main body, the second protruding part being in contact with the stator slot wall and / or another second protruding part and / or the main body.

5. The slotted cooling stator of claim 1, wherein, The first protruding part is formed in a strip shape, and the length of the first protruding part in the axial direction of the stator core is greater than the axial length of the stator core.

6. The slotted cooling stator of claim 5, wherein, In one of the insulating papers, the area of the first protruding part is not more than 20% of the area of the one side of the insulating paper.

7. The slotted cooling stator of claim 1, wherein, The first protruding part is formed in a block shape, and the one side of the main body comprises a plurality of the first protruding parts which are not connected.

8. The slotted cooling stator of claim 7, wherein, In one of the insulating papers, the area of the first protruding part is not more than 10% of the area of the one side of the insulating paper.

9. The slotted cooling stator of claim 1, wherein, The insulating paper is folded into a cross section of a Chinese character "Ri", so that at least two of the conductors can be separated.

10. The slotted cooling stator of claim 4, wherein, Two of the conductors have two layers of the main body, and the second protruding parts on the two layers of the main body are in contact with or staggered with each other in the radial direction of the stator core.

Images