Double-stator cooling structure sharing iron core and motor

Abstract

The utility model provides a double-stator cooling structure sharing an iron core and a motor. The core-shared dual stator cooling structure may include a stator core and a stator end cap. The stator core comprises a plurality of inner stator slots and a plurality of outer stator slots, inner coils are arranged in the inner stator slots, and outer coils are arranged in the outer stator slots. Oil inlet channels are arranged between the inner stator grooves and the outer stator grooves, and a plurality of oil outlet channels are arranged between the inner stator grooves and between the outer stator grooves. The stator end cover is arranged at one axial end of the stator iron core and forms an annular groove, and the annular groove wraps the structures, protruding out of the stator iron core, of the inner coil and the outer coil. An oil guide part protruding towards the stator core is arranged in the stator end cover, the oil guide part is located between the inner coil and the outer coil in the radial direction of the stator core, and cooling oil can enter the stator end cover at one axial end from the other axial end through the oil inlet channel and then can return to the other axial end of the stator core through the oil outlet channel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor cooling, in particular to a double-stator cooling structure sharing a core and a motor. BACKGROUND

[0002] Stator oil cooling is a kind of efficient motor cooling technology, mainly used for heat control of motors in electric vehicles and hybrid electric vehicles. The inventor understands that the stator oil cooling scheme includes:

[0003] (1) Direct cooling of stator slots. The stator core includes stator slots in which windings are installed. Cooling oil can be directly injected into the stator slots, and the cooling oil can directly contact the windings to absorb and carry away heat. This method directly targets the heat source and has good cooling effect.

[0004] (2) Oil spray cooling. Cooling oil is directly sprayed into the heat generating site in the stator slot through a nozzle. This method is commonly used in modular motors.

[0005] The inventor also understands a double stator sharing a core, i.e., an inner stator winding and an outer stator winding are respectively arranged on the inner side and the outer side of the same core. The foregoing two methods can be used to cool this type of stator.

[0006] However, the inventor finds that the cooling oil circuit is complex, and when facing two stator windings, the cooling oil distribution is uneven, and local overheating may occur. In addition, some areas in the stator may accumulate oil, and the cooling oil circuit does not form an effective circulation. CONTENT OF THE INVENTION

[0007] In order to solve or alleviate at least one problem mentioned in the background art, the present application provides a double-stator cooling structure sharing a core and a motor.

[0008] The double-stator cooling structure sharing a core provided by the embodiment of the present application includes:

[0009] A stator core includes a plurality of inner stator slots arranged on the radially inner side thereof and a plurality of outer stator slots arranged on the radially outer side thereof, an inner coil is arranged in each of the inner stator slots, an outer coil is arranged in each of the outer stator slots, an oil inlet channel axially penetrating the stator core is arranged between the inner stator slots and the outer stator slots, and a plurality of oil outlet channels axially penetrating the stator core are arranged between each of the inner stator slots and each of the outer stator slots.

[0010] A stator end cover is arranged at one axial end of the stator core and is formed with a ring groove that encloses the inner coil and the structure of the outer coil protruding from the stator core, the stator end cover is provided with an oil guide portion protruding towards the stator core, in the radial direction of the stator core, the oil guide portion is located between the inner coil and the outer coil, cooling oil can enter the stator end cover at one axial end through the oil inlet channel at the other axial end, and then return to the other axial end of the stator core through the oil outlet channel.

[0011] In at least one embodiment, the stator core is provided with a plurality of oil inlet channels arranged dispersedly.

[0012] In at least one embodiment, the stator end cover includes a plurality of oil guide portions discontinuous in the circumferential direction thereof, the oil guide portions include inclined surfaces for guiding the cooling oil entering the stator end cover from the oil inlet channel to the circumferential and / or radial sides of the oil guide portions.

[0013] In at least one embodiment, a gap is provided between the oil guide portion and the opposite two end faces of the stator core.

[0014] In at least one embodiment, the oil guide portion and the opposite two end faces of the stator core are in abutment, and the oil inlet channel and the oil guide portion are staggered in the circumferential direction of the stator core.

[0015] In at least one embodiment, at one axial end of the stator core, the inner side of the inner stator slot and the outer side of the outer stator slot are respectively provided with an inner abutment ring and an outer abutment ring continuous in the circumferential direction, and the stator end cover includes an inner circumferential wall and an outer circumferential wall extending towards the stator core, the inner circumferential wall abuts the inner abutment ring, and the outer circumferential wall abuts the outer abutment ring.

[0016] In at least one embodiment, the inner circumferential wall elastically abuts the inner abutment ring, and the outer circumferential wall elastically abuts the outer abutment ring, so that the stator end cover is sealingly connected to the stator core.

[0017] In at least one embodiment, the oil outlet channel includes a first oil outlet channel arranged alternately with the inner stator slot in the circumferential direction of the stator core and a second oil outlet channel arranged alternately with the outer stator slot.

[0018] In at least one embodiment, the double-stator cooling structure of the shared core includes a bolt, the bolt is threadedly connected to the end face of the stator core through the oil guide portion.

[0019] The motor provided by the embodiments of the present application includes the double-stator cooling structure of the shared core as described above.

[0020] In this application, the cooling oil enters the annular groove of the stator end cover through the oil inlet channel, and then returns to the other axial end of the stator core through the oil outlet channel. Figure 2 (At the left end), the cooling oil circulation path is stable. In the stator end cover, the oil guide can evenly guide the cooling oil to the inner and outer stator slots, reducing local overheating. In addition, the oil guide can also reduce the volume of the annular groove, making the oil circulation efficiency higher and reducing oil accumulation. Attached Figure Description

[0021] Figure 1 A schematic diagram of the stator core and stator end cap in a dual-stator cooling structure with a shared core according to an embodiment of this application is shown.

[0022] Figure 2 A partial structural schematic diagram of the stator core and stator end cover in a dual-stator cooling structure with a shared core according to an embodiment of this application is shown in cross-sectional view.

[0023] Figure 3 An isometric view of the stator end cover in a dual-stator cooling structure with a shared core according to an embodiment of this application is shown.

[0024] Figure 4 It shows Figure 3 The image shows a front view of the stator end cover, which also shows the oil guide section.

[0025] Figure 5 A partial schematic diagram of the stator core in a dual-stator cooling structure with a shared core according to an embodiment of this application is shown from one perspective.

[0026] Figure 6 It shows Figure 3 A partial schematic diagram of the stator end cover.

[0027] Figure 7 A partial schematic diagram of the stator core in a dual-stator cooling structure with a shared core according to an embodiment of this application is shown from another perspective.

[0028] Explanation of reference numerals in the attached figures

[0029] 100 stator core

[0030] 111 Inner stator slot

[0031] 112 Inner Coil

[0032] 113 Inner Confrontation Ring

[0033] 121 External stator slot

[0034] 122 outer coil

[0035] 123 External contact ring

[0036] 130 Oil Inlet Channel

[0037] 140 Oil outlet channel

[0038] 141 First oil outlet channel

[0039] 142 Second oil outlet channel

[0040] 150 Iron core end face

[0041] 200 stator end cap

[0042] 210 Annular Groove

[0043] 220 Oil Guide Section

[0044] 221 Oil guide end face

[0045] 222 bevel

[0046] 231 Inner peripheral wall

[0047] 232 Outer wall

[0048] 233 bottom wall

[0049] 240 Confrontational Structure Detailed Implementation

[0050] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0051] This application provides a dual-stator cooling structure and motor with a shared iron core.

[0052] See Figure 1 , Figure 2 The dual-stator cooling structure with a shared iron core may include a stator iron core 100 and a stator end cover 200.

[0053] The stator core 100 may include a plurality of inner stator slots 111 disposed on its radially inner side and a plurality of outer stator slots 121 disposed on its radially outer side. Inner coils 112 are disposed in the inner stator slots 111, and outer coils 122 are disposed in the outer stator slots 121. An oil inlet channel 130 axially penetrates the stator core 100 is disposed between the inner stator slots 111 and the outer stator slots 121. A plurality of oil outlet channels 140 axially penetrate the stator core 100 are disposed between each inner stator slot 111 and between each outer stator slot 121.

[0054] Stator end cap 200 can be disposed at one axial end of stator core 100 and form an annular groove 210 (seeFigure 3 The annular groove 210 covers the structures of the inner coil 112 and the outer coil 122 that protrude from the stator core 100. An oil guide portion 220 protruding towards the stator core 100 is provided in the stator end cover 200. The oil guide portion 220 is located radially between the inner coil 112 and the outer coil 122 of the stator core 100.

[0055] It should be understood that Figure 2 In the diagram, dashed line A represents the axis of stator core 100 and stator end cover 200. Figure 2 Only half of the stator core 100 and half of the stator end cap 200 are shown schematically from a cross-sectional view.

[0056] See Figure 2 In this application, the cooling oil is supplied from the other end of the axial direction ( Figure 2 The left end) enters the axial end through the oil inlet channel 130 ( Figure 2 After the stator end cover 200 (on the right end) is removed, the oil can return to the other axial end of the stator core 100 via the oil outlet channel 140, and then be guided to other positions to achieve cooling circulation. This application does not limit the way cooling oil is introduced into the oil inlet channel 130. For example, oil can be supplied to the oil inlet channel 130 by providing a pipe connected to the other axial end of the oil inlet channel 130.

[0057] The heat generated by the coil can be transferred to the oil inlet channel 130 and the oil outlet channel 140 for indirect cooling. Compared with direct cooling, this method reduces the risk of contamination and insulation damage in the stator slots.

[0058] In the stator end cover 200, the oil guide section 220 can guide the cooling oil to be distributed on both the inner and outer sides, and evenly guide the cooling oil to the inner stator groove 111 and the outer stator groove 121, so that the cooling oil is more evenly distributed and local overheating is reduced. In addition, the oil guide section 220 can also reduce the volume of the annular groove 210, so that the oil circulation efficiency is higher and oil accumulation is reduced.

[0059] In one implementation, see Figure 5 Multiple oil inlet channels 130 can be distributed in the stator core 100. For example, see... Figure 3 The horizontal arrow can indicate the oil passage that enters the stator end cover 200 through the oil inlet channel 130. The stator core 100 may include multiple ( ) arranged circumferentially. Figure 5 (The quantity and structure are only illustrative) Oil inlet channel 130.

[0060] In one implementation, see Figure 3 , Figure 4 The stator end cap 200 may include a plurality of discontinuous oil guide portions 220 in its circumferential direction. Figure 3 , 4The number and structure of the oil guide portion 220 are merely illustrative. The oil guide portion 220 can include a slope 222 for guiding the cooling oil, which enters the stator end cover 200 from the oil inlet passage 130, to both circumferential sides and / or both radial sides of the oil guide portion 220. That is, the slope 222 can be provided on both sides in the circumferential direction and / or both sides in the radial direction of the oil guide portion 220. The slope 222 is inclined in a direction that satisfies the condition that, in the axial direction of the stator end cover 200, the cross-sectional area of the oil guide portion 220 perpendicular to the axial direction becomes smaller as it approaches the oil guide portion end surface 221 of the oil guide portion 220 facing the stator core 100.

[0061] In one embodiment, referring to Figure 2 , a gap is provided between the oil guide portion 220 and the two end surfaces of the stator core 100 facing each other. Referring to Figure 2 , Figure 6 , Figure 7 , for example, a gap can be provided between the oil guide portion end surface 221 of the oil guide portion 220 and the core end surface 150 of the stator core 100. In the case of having a gap, the oil guide portion 220 can include a plurality of protruding structures arranged with a gap or a continuous annular protruding structure.

[0062] In one embodiment, the two end surfaces of the oil guide portion 220 and the stator core 100 facing each other are in contact (not shown in the drawing). In the circumferential direction of the stator core 100, the oil inlet passage 130 and the oil guide portion 220 can be staggered.

[0063] Illustratively, referring to Figure 6 , a contact structure 240, for example, a cylindrical shape, which protrudes from the oil guide portion end surface 221, can be provided on the oil guide portion 220 as a bolt connection hole. The contact structure 240 can be in contact with the core end surface 150 so that the two end surfaces of the oil guide portion 220 and the stator core 100 facing each other have a gap.

[0064] In one embodiment, referring to Figure 7 , at one end in the axial direction of the stator core 100, the inner side of the inner stator slot 111 and the outer side of the outer stator slot 121 are respectively provided with an inner contact ring 113 and an outer contact ring 123 continuous in the circumferential direction. The inner contact ring 113 and the outer contact ring 123 can block the radial opening of the end position of the inner stator slot 111 and the outer stator slot 121.

[0065] Referring to Figure 6 , the stator end cover 200 includes an inner peripheral wall 231, an outer peripheral wall 232, and a bottom wall 233 between the two, which form the ring groove 210. The inner peripheral wall 231 is in contact with the inner contact ring 113 in the axial direction, and the outer peripheral wall 232 is in contact with the outer contact ring 123 in the axial direction.

[0066] Further, the inner circumferential wall 231 elastically abuts against the inner abutting ring 113, and the outer circumferential wall 232 elastically abuts against the outer abutting ring 123, so that the stator end cover 200 is sealingly connected to the stator core 100. The structure of the sealing connection can prevent the cooling oil from flowing away directly from the gap between the stator core 100 and the stator end cover 200 after entering the stator end cover 200.

[0067] Exemplarily, the stator end cover 200 can be manufactured by a process of secondary injection molding. The material of the first injection molding can be PA66+GF30 (polyamide 66, in which 30% by weight of glass fiber is mixed). The material of the second injection molding can be TPU (thermoplastic elastomer), so that the inner circumferential wall 231 and the outer circumferential wall 232 are elastic to facilitate sealing.

[0068] In an embodiment, the stator end cover 200 is bolted to the stator core 100. Further, the bolt is screwed to the end face of the stator core 100 through the cylindrical abutting structure 240 of the oil guide portion 220. The bolted manner increases the stability of the stator end cover 200 and reduces the noise and vibration generated when the cooling oil flows.

[0069] In an embodiment, referring to Figure 5 The oil outlet channel 140 includes the first oil outlet channel 141 arranged alternately with the inner stator slot 111 and the second oil outlet channel 142 arranged alternately with the outer stator slot 121, which increases the uniformity of heat dissipation.

[0070] The application also provides an electric machine, which can include the aforementioned common-core double-stator cooling structure. The electric machine can also include an inner rotor located at the inner circumferential side of the stator core 100 and an outer rotor located at the outer circumferential side of the stator core 100.

[0071] The above describes the preferred embodiments of the application. It should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the application, and these improvements and refinements should also be considered as falling within the scope of protection of the application.

Claims

1. A dual-stator cooling structure with a shared iron core, characterized in that, include: A stator core includes multiple inner stator slots disposed on its radially inner side and multiple outer stator slots disposed on its radially outer side. An inner coil is disposed in the inner stator slot and an outer coil is disposed in the outer stator slot. An oil inlet channel axially penetrating the stator core is disposed between the inner stator slots and the outer stator slots. Multiple oil outlet channels axially penetrating the stator core are disposed between each inner stator slot and between each outer stator slot. A stator end cap is disposed at one axial end of the stator core and forms an annular groove therein, the annular groove covering the protruding structures of the inner coil and the outer coil of the stator core. The stator end cap is provided with an oil guide portion protruding toward the stator core. In the radial direction of the stator core, the oil guide portion is located between the inner coil and the outer coil. Cooling oil can enter the stator end cap at one axial end from the other axial end through the oil inlet channel, and then return to the other axial end of the stator core through the oil outlet channel.

2. The dual-stator cooling structure with a shared iron core according to claim 1, characterized in that, The stator core is provided with multiple oil inlet channels that are distributed in a dispersed manner.

3. The dual-stator cooling structure with a shared iron core according to claim 1, characterized in that, The stator end cover includes a plurality of discontinuous oil guide portions in its circumferential direction. The oil guide portions include inclined surfaces for guiding cooling oil entering the stator end cover from the oil inlet channel to the circumferential and / or radial sides of the oil guide portions.

4. The dual-stator cooling structure with a shared iron core according to claim 1, characterized in that, A gap is provided between the oil guide section and the two opposing end faces of the stator core.

5. The dual-stator cooling structure with a shared iron core according to claim 1, characterized in that, The oil guide section and the two opposing end faces of the stator core abut against each other, and the oil inlet channel and the oil guide section are offset in the circumferential direction of the stator core.

6. The dual-stator cooling structure with a shared iron core according to claim 1, characterized in that, At one axial end of the stator core, the inner side of the inner stator slot and the outer side of the outer stator slot are respectively provided with an inner abutment ring and an outer abutment ring that are continuous in the circumferential direction. The stator end cover includes an inner peripheral wall and an outer peripheral wall extending toward the stator core. The inner peripheral wall abuts against the inner abutment ring, and the outer peripheral wall abuts against the outer abutment ring.

7. The dual-stator cooling structure with a shared iron core according to claim 6, characterized in that, The inner peripheral wall elastically abuts against the inner abutting ring, and the outer peripheral wall elastically abuts against the outer abutting ring, so that the stator end cover is sealed to the stator core.

8. The dual-stator cooling structure with a shared iron core according to claim 1, characterized in that, The oil outlet channels include a first oil outlet channel that alternates with the inner stator slots in the circumferential direction of the stator core and a second oil outlet channel that alternates with the outer stator slots.

9. The dual-stator cooling structure with a shared iron core according to claim 1, characterized in that, The dual-stator cooling structure with a shared core includes bolts, which are threaded to the end face of the stator core via the oil guide portion.

10. An electric motor, characterized in that, The dual-stator cooling structure includes the common iron core as described in any one of claims 1 to 9.

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