Concentrated winding motor interphase isolation and winding arrangement structure and cooling method

Abstract

The invention discloses a concentrated winding motor interphase isolation and winding arrangement structure and a cooling method, the structure comprises a stator yoke part, a groove, a tooth part and an isolation groove located in the center of the tooth part and axially arranged in a penetrating manner, an insulating medium is injected into the isolation groove, and the isolation groove is covered with a nano ceramic insulating layer and is used for realizing interphase insulation and cooling functions. A cooling medium circularly flows in the isolation groove through the annular collecting pipe to directly cool the tooth part core hot area; the windings are arranged in a staggered mode in the radial direction, the axial direction and the circumferential direction, a three-dimensional micro-channel and a turbulent flow field are formed in a groove, and active heat dissipation of the conductor layer is achieved. Through the synergistic effect of the isolation groove main channel and the staggered micro-channel, a composite cooling system with zero-distance contact of a heat source and a cooling medium is formed. According to the scheme, the stator temperature rise is effectively reduced, the interphase insulation strength is improved, uniform temperature control is achieved, and the method is suitable for active cooling and insulation integrated design of a high-power-density motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a concentrated winding motor phase isolation and winding arrangement structure and cooling method. BACKGROUND

[0002] Traditional concentrated winding motors have structural and physical limitations in terms of heat dissipation and insulation, which directly restrict the power density improvement and long-term reliability of the motor. In the prior art, the winding ends are usually crossed and overlapped, causing the wire bundles to interleave and form a dense grid with very low porosity (such as less than 40%), forcing the cooling airflow to make multiple turns, resulting in a significant decrease in cooling efficiency and the formation of local high-temperature hot spots.

[0003] In the traditional coil concentration layout, the coils of the same phase are closely adjacent, and the heat is highly concentrated and superimposed in this area, lacking effective low-temperature heat dissipation paths, which exacerbates the risk of insulation aging and even breakdown. In addition, when the winding inter-phase insulation deteriorates, the concentrated layout also easily leads to inter-phase short circuit failure. The cooling medium flows unevenly under the traditional layout, and high-temperature hot spots will block the airflow, forming flow field dead zones, further reducing the overall cooling efficiency.

[0004] In view of this, the present application proposes a concentrated winding motor phase isolation and winding arrangement structure and cooling method. SUMMARY

[0005] The purpose of the present application is to provide a concentrated winding motor phase isolation and winding arrangement structure and cooling method, which reconfigures the geometric topology and fluid dynamics of the winding heat dissipation channel through physical isolation and three-dimensional staggered arrangement, achieving a breakthrough in heat dissipation efficiency while enhancing the inter-phase insulation reliability.

[0006] In a first aspect, the present application provides a concentrated winding motor phase isolation and winding arrangement structure, characterized in that the motor stator comprises a stator yoke, a recess, a tooth portion, and an isolation groove arranged in the center of the tooth portion:

[0007] The recess is formed between adjacent tooth portions for embedding the concentrated winding coils, and the isolation groove is filled with insulating cooling medium and connected to an external cooling system;

[0008] The winding is arranged in a staggered manner in the radial and axial directions, forming a through cooling flow channel between the conductor layers, and the isolation groove as the main cooling channel is connected to the cooling channel formed by the winding stagger, cooperatively constructing a three-dimensional composite cooling system to realize direct cooling, heat flow balance, and inter-phase insulation of the core area of the tooth portion.

[0009] As a preferred technical solution of the first aspect of the application, the cross section of the isolation groove is trapezoidal structure, the opening near the rotor side is wider than the opening near the stator yoke side, so as to form a flow rate gradient and improve the flow distribution of the cooling medium.

[0010] As a preferred technical solution of the first aspect of the application, the inner wall of the isolation groove is covered with a nano ceramic insulation layer, which is used to realize magnetic flux shielding between phases while conducting heat transfer.

[0011] As a preferred technical solution of the first aspect of the application, the winding is arranged in a staggered manner in the radial direction, wherein:

[0012] The odd-numbered slot position coils A1, A3, B2, B4, C1 and C3 are offset by 15 mm towards the center of the circle,

[0013] The even-numbered slot position coils A2, A4, B1, B3, C2 and C4 are offset by 15 mm towards the stator yoke,

[0014] In order to form a stepped through cooling flow channel in the slot depth direction, the cooling medium can flow radially between adjacent conductor layers to realize convective heat transfer between layers.

[0015] As a preferred technical solution of the first aspect of the application, the winding is arranged in a staggered manner in the axial direction, and the even-numbered coils are offset by 50 mm along the motor axis direction to form a longitudinal cooling gap at the end, so that the cooling medium forms a continuous flow channel in the axial direction at the end of the conductor to realize longitudinal cooling between conductor layers.

[0016] As a preferred technical solution of the first aspect of the application, the end portions of the phase windings are arranged asymmetrically in the circumferential direction, so that the intersection points of the three-phase winding end portions are offset in the circumferential direction to form a vortex flow path at the end of the motor, wherein:

[0017] The mechanical angle between the adjacent tooth portions at the bottom is 32°, and the mechanical angle between the remaining tooth portions is 29.5°, so as to form a vortex flow path in the end region and construct a self-organizing turbulent flow field.

[0018] In the second aspect, the application provides a cooling method for phase isolation and winding arrangement of a concentrated winding motor, which is used to cooperate with the cooling of the first aspect, comprising the following steps:

[0019] S1, injecting cooling medium into the annular header through an external cooling system, the cooling medium being insulating oil or water glycol mixture, and entering the inlet of each isolation groove under the driving of a cooling pump to flow along the axial direction of the stator;

[0020] S2, the cooling medium flows in the axial direction in the isolation groove, directly exchanges heat with the internal metal core of the tooth portion and the side wall of the winding, and realizes direct cooling of the core heat source area of the tooth portion.

[0021] S3, after the cooling medium flows out of the isolation groove, part of the fluid flows into the micro flow channel formed by the staggered winding layers in the radial direction and the axial direction, generates local disturbance and forms convection flow to strengthen heat exchange and reduce local temperature rise;

[0022] S4, the cooling medium continues to flow to the end of the motor, forms a rotating flow path through the circumferential staggered structure of the end winding, generates vortex flushing in the end area, and realizes end heat exchange;

[0023] S5, the cooling medium returns to the external cooling circulation system through the outlet of each isolation groove and the end manifold, is cooled by the heat exchanger and then recycled, forming a closed cooling circuit.

[0024] As a preferred technical solution of the second aspect of the application, the isolation groove serves as a main cooling channel, is connected with the micro flow channel formed by the radially staggered winding and the vortex flow channel formed by the end stagger, and together forms a continuous three-dimensional cooling path, so that the cooling medium forms a through-flow network in the stator.

[0025] As a preferred technical solution of the second aspect of the application, the cooling medium directly contacts the core heat source area of the tooth portion through the isolation groove during axial flow, and forms multidirectional flow channels between winding layers and end spaces to realize uniform heat transfer and heat dissipation in the stator.

[0026] As a preferred technical solution of the second aspect of the application, the cooling medium sequentially passes through the isolation groove, the winding micro flow channel and the end vortex flow channel during circulation, forming a heat source-medium zero-distance heat exchange path, so as to maintain stable overall temperature rise of the stator under high power density operating conditions.

[0027] In the above technical solution, the application provides the technical effects and advantages:

[0028] The application sets the isolation groove in the stator tooth portion in the axial direction, and injects insulating oil or water glycol mixture, so that the cooling medium can directly flow through the core heat source area of the tooth portion and exchange heat with the winding side wall. At the same time, the winding layers arranged in the radial direction and the axial direction form through micro flow channels and end vortex flow channels, which promote the continuous flow and turbulent disturbance of the cooling medium in the stator, so as to realize zero-distance contact between the heat source and the cooling medium without increasing the structure volume, strengthen the heat dissipation efficiency, balance the temperature rise and improve the interphase insulation reliability. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art based on the drawings without creative work belong to the protection scope of the present application.

[0030] Figure 1 The stator cross-sectional view of the concentrated winding motor after the physical isolation slot design and the phase coil staggered layout of the present application.

[0031] Figure 2 The schematic diagram of the staggered layout of the stator winding coil in the radial direction of the present application.

[0032] Figure 3 The inner wall development diagram after the physical isolation slot 3 design and the phase coil staggered layout of the stator of the present application.

[0033] Figure 4 The method flow chart of the phase isolation and winding arrangement structure and cooling method of the concentrated winding motor of the present application.

[0034] In the figure: 1, stator yoke; 2, groove; 3, isolation slot; 4, tooth portion. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present application clearer, the following will combine the drawings in the embodiments of the present application to describe the technical solutions in the embodiments of the present application in more detail.

[0036] In the drawings, the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all embodiments. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present application. The embodiments of the present application will be described in detail below in combination with the drawings.

[0037] Embodiment 1

[0038] Please refer to Figure 1As shown, the embodiment provides a concentrated winding motor phase isolation and winding arrangement structure. In view of the problems of phase short circuit, overheating, uneven heat dissipation and the like that are prone to occur in traditional concentrated winding motors under high power density conditions, a motor stator structure integrating physical isolation, winding misplacement and active cooling is proposed. Taking a motor stator of a three-phase 12-pole motor as an example, the motor stator has 12 slots, and the coil winding mode is concentrated winding, wherein the outer radius is 250 mm, and the inner radius is 150 mm. The motor stator includes a stator yoke 1, a groove 2, an isolation groove 3 and a tooth portion 4, wherein:

[0039] The stator yoke 1 is an outer ring structure of the stator, constitutes a main support part of a motor magnetic circuit, forms a loop channel of magnetic flux and bears mechanical stress, provides structural strength and a magnetic circuit closing path for the whole stator.

[0040] The tooth portion 4 extends radially from the inner wall of the stator yoke 1 to the center, each tooth portion 4 is a magnetic pole component of the stator core, the outer side is covered with winding coils, and is a main magnetic path of energy conversion of the motor. It is the core structure of the concentrated winding motor in the magnetic flux dense area and energy conversion;

[0041] The grooves 2 are formed between adjacent tooth portions 4, and are used for embedding concentrated winding coils. Each groove 2 corresponds to a placement space of a phase coil. By embedding and misplacing the winding in the groove 2, a multi-layer flow channel structure can be formed in the radial and axial directions, thereby realizing the integration of conductor arrangement and cooling function.

[0042] The isolation groove 3 is provided in the center axial direction of each tooth portion 4, the isolation groove 3 penetrates the whole length of the core, the groove cross section is in a trapezoidal structure, the long side is 20 mm and the short side is 16 mm, an axial through groove is provided in the center of the tooth portion 4 of the stator core, penetrates the whole length of the core, the inner wall of the groove is covered with a nano ceramic insulation layer, and the inlet and outlet are respectively communicated with the external cooling system through the annular header.

[0043] The cooling medium is injected into the groove, and the cooling medium is an insulating oil or a water-glycol mixture. The isolation groove 3 is used as a main cooling channel in structure, and the cooling medium is directly delivered to the core heat source area of the tooth portion 4, so as to realize zero-distance contact between the heat source and the cooling medium. On the one hand, the design significantly enhances the heat dissipation capacity, and on the other hand, improves the interphase insulation performance, and effectively reduces the risk of phase short circuit.

[0044] In order to further improve the heat distribution of the bottom area of the stator, the mechanical angle between the tooth portions 4 at the bottom of the motor is adjusted to 32°, and the standard angle of the remaining tooth portions is kept at 29.5°, so as to relieve the heat accumulation phenomenon at the bottom and optimize the magnetic flux uniformity.

[0045] The stator yoke 1 and the tooth portion 4 are integrally formed to constitute a complete magnetic circuit structure; the recess 2 is located between adjacent tooth portions 4 to form an electromagnetic induction and coil embedding area; the isolation groove 3 is located in the center of the tooth portion 4 as a cooling and insulation function composite channel. The four are sequentially arranged from the outside to the inside: the outer layer is the stator yoke 1, the middle layer is the tooth portion 4, the recess 2 is formed between the tooth portions, and the isolation groove 3 is arranged in the tooth portion.

[0046] Each component is nested in space and coupled in function to form a complete stator structure that integrates magnetic circuit support, coil arrangement, thermal management, and insulation isolation.

[0047] Through the above structure design, the motor stator maintains the integrity of the magnetic circuit while realizing the integration of electromagnetic structure, thermal management, and insulation protection. Among them:

[0048] The stator yoke 1 provides magnetic circuit and mechanical support;

[0049] The tooth portion 4 realizes electromagnetic energy conversion;

[0050] The recess 2 is used for concentrated winding coil arrangement;

[0051] The isolation groove 3 has dual functions of cooling and insulation.

[0052] This structure forms a composite system of magnetic field conduction area, winding arrangement area, and cooling main channel in the stator, effectively realizes uniform temperature rise, short heat flow path, high cooling efficiency under high power density operating conditions, and significantly improves the insulation reliability between phases and the overall heat dissipation performance of the stator.

[0053] Embodiment 2

[0054] Based on embodiment 1, this embodiment further provides a concentrated winding motor stator structure based on staggered winding arrangement and turbulent cooling channel cooperation, which is used to further improve the cooling efficiency, reduce the risk of inter-phase short circuit, and improve the thermal uniformity between windings.

[0055] Please refer to Figure 2 In this embodiment, the motor stator is composed of a stator yoke 1, a recess 2, an isolation groove 3, and a tooth portion 4. The stator adopts a concentrated winding structure, and the coils wound on the twelve tooth portions 4 are arranged in a radial and axial staggered manner to construct a three-dimensional cooling channel and improve the inter-phase insulation performance. In the coil arrangement, when the staggered arrangement is not used, the coils of each phase are in the form of conventional stacking in the slot, and the conductors are tightly stacked in parallel in the slot depth direction, the heat dissipation path is single, the fluid channel is blocked, and it is easy to cause heat accumulation and inter-phase short circuit hazards.

[0056] To achieve efficient cooling and uniform spatial heat distribution, the coils embedded in the grooves 2 adopt a radial and axial double-misalignment arrangement structure, and improvements are made in the winding arrangement and cooling path design.

[0057] In the radial direction, the A1, A3, B2, B4, C1, C3 slot position coils are moved 15 mm towards the center of the circle; the A2, A4, B1, B3, C2, C4 slot position coils are moved 15 mm towards the stator yoke 1. In this way, the conductor layers in the slot depth direction are no longer completely overlapped, but form a stepped through-flow channel, providing a continuous radial flow channel for the cooling medium; that is, a stepped through-flow channel is formed in the slot depth direction, allowing the cooling medium to form a continuous flow channel between adjacent conductor layers.

[0058] In the axial direction, the even-numbered coils (A2, B2, C2, etc.) are offset by 50 mm along the axis, so that the end portions of adjacent coils form a stepped misalignment structure in the axial direction, thereby creating a through longitudinal flow gap in the end region, allowing the cooling medium to flow in the axial direction and achieve longitudinal cooling between the conductor layers; that is, the end portions of each winding form a stepped gap structure in the axial direction, thereby creating a cooling flow channel in the axial direction.

[0059] Through the above-mentioned radial and axial double-misalignment arrangement, a vertical through micro-flow channel structure can be generated between the winding layers, promoting convective heat transfer and turbulent disturbance of the cooling medium, and achieving the design goal of "conductor as heat sink". The cooling liquid can form a connected flow network inside the winding and the main channel of the isolation groove 3, significantly improving the heat dissipation capacity and reducing the risk of inter-phase short circuit; that is, without increasing the space occupation, a three-dimensional cooling system is constructed by the conductor layer, the groove 2, and the isolation groove 3, achieving the synergistic optimization of electromagnetic, thermal, and insulation performance.

[0060] In addition, please refer to Figure 3 , the present embodiment further optimizes the design of the stator winding in the circumferential and end structure to achieve comprehensive active cooling and inter-phase isolation function. In the stator inner wall expansion structure, the isolation groove 3 penetrates along the tooth axis to form a cooling main channel, and each phase winding adopts an end circumferential misalignment arrangement, that is, the end portion intersection points of the three-phase winding are asymmetrically offset in the circumferential direction, causing disturbance to the fluid flow path in the end region, constructing a self-organizing turbulent flow field, and achieving vortex full-coverage heat exchange.

[0061] In terms of mechanical structure parameters, the mechanical angle of the bottom phase coils is adjusted from 30° to 32°, and the remaining coils maintain 29.5°, to slow down the heat accumulation at the bottom and optimize the magnetic flux distribution. The total length of the stator side is 600 mm, of which the cross-sectional length of the tooth portion 4 near the rotor side is 40 mm, and the cross-sectional length near the stator yoke 1 side is 20 mm.

[0062] At the same time, the even-numbered winding is offset by 50 mm in the axial direction, and an asymmetric stepped structure is formed at the adjacent end, which helps to form longitudinal rotating turbulence of the cooling medium in the end passage, and strengthens the heat exchange effect of the end region.

[0063] The isolation groove 3 arranged between every two coils is 10 mm away from the root of the adjacent tooth 4; the inside of the groove body is injected with an insulating medium (insulating oil or water glycol mixture) for improving the interphase insulation level and directly cooling the tooth heat source area. The trapezoidal structure of the isolation groove 3 increases the contact area with the coil conductor, further improving the heat exchange efficiency.

[0064] Through the above structure combination, a three-dimensional composite cooling system of main cooling channels, local turbulence micro-channels and circumferential staggered flow channels is formed in the motor stator. The following is achieved:

[0065] Zero distance contact between heat source and cooling medium (isolation groove directly cuts into the core heat area of the tooth);

[0066] Active heat dissipation of electromagnetic structure (staggered winding induces vertical flow and vortex flushing);

[0067] Integration of interphase insulation and cooling (insulating liquid medium simultaneously plays the roles of cooling and insulation).

[0068] Finally, the motor realizes the comprehensive performance improvement of uniform temperature rise, reliable insulation and efficient cooling under the condition of high power density operation.

[0069] Example 3

[0070] Based on the structure described in Example 1 and Example 2, this embodiment further discloses a cooling method for the interphase isolation and winding arrangement structure of a concentrated winding motor, as shown in Figure 4 for realizing active heat dissipation, interphase insulation and thermal flow homogenization control of the motor stator during operation. The method is based on the structural system composed of the stator yoke 1, the groove 2, the isolation groove 3 and the tooth 4, and combines the three-dimensional staggered cooling channels formed in Example 2, and realizes the following steps:

[0071] Step S1: Cooling medium injection and circulation start, insulating medium is injected into the annular header through the external cooling system, and the insulating medium is insulating oil or water glycol mixture. Under the driving of the cooling pump, the cooling medium flows into the inlet of each isolation groove 3 from the annular header, flows along the axial direction of the stator, and forms a main cooling circuit. A continuous circulation flow path is established, so that the cooling medium can enter the inside of each tooth 4 along the axial direction, directly contact the core heat source, and realize the initial distribution of the stator cavity cooling.

[0072] Step S2: main channel cooling and heat conduction, the cooling medium flows in the isolated groove 3 inside along the axial direction, and directly exchanges heat with the metal core and winding side wall inside the tooth part 4. The trapezoidal isolated groove 3 section enlarges the contact area with the conductor layer, and the nanometer ceramic insulation layer effectively blocks the electrical coupling while ensuring high thermal conductivity; realize the "zero distance contact" of heat source-cooling medium, quickly export the core area heat of tooth part 4, and keep the interphase insulation safety.

[0073] Step S3: interlaminar cooling and turbulence induction, after the cooling medium flows out of the isolated groove 3, part of the cooling fluid enters the micro flow channel composed of the staggered coil layers in the radial and axial directions. Due to the staggered arrangement of the coil in the groove depth direction and the axial direction, the cooling liquid produces intersection disturbance between different layers, the flow boundary layer is destroyed, and the flow state changes from laminar flow to local turbulent flow, forming longitudinal and transverse staggered flow. Significantly improve the local heat transfer coefficient (about 30-50%), realize the active cooling control of high heat density area, and avoid the formation of local hot spots.

[0074] Step S4: end turbulence enhancement and vortex flushing, the cooling liquid continues to flow to the end along the motor axial direction, and forms a rotating flow path through the circumferential staggered structure of the end winding. The cooling medium generates self-organizing vortex area in the end space, and performs annular flushing cooling on the winding end and lead area, strengthens the end region heat transfer capacity, prevents the lead end from overheating, and realizes the overall temperature balance of the stator end.

[0075] Step S5: cooling medium confluence and return, the cooled medium is combined by the outlet of each isolated groove 3 and the end manifold, returns to the external cooling circulation system, and is cooled by the heat exchanger again for recycling. The whole system forms a closed circulation flow, realizes energy closed loop management, ensures the stability of cooling efficiency, and maintains the cleanliness and dielectric performance of the motor insulation oil in the closed environment.

[0076] Step S6: dynamic thermal field regulation, under high power density conditions, the flow distribution valve and temperature sensor of the external cooling system can be controlled to realize adaptive flow adjustment according to the temperature distribution of each tooth part 4 region, so that the cooling flow is automatically concentrated to the high temperature area, the thermal field is balanced, the dynamic closed loop control of the motor internal heat flow is realized, the stator temperature rise gradient is controlled within ±5℃, and the overall operation stability and service life are improved.

[0077] The present application sets up an isolated groove 3 in the center axial direction of the stator core tooth part 4, and injects insulation medium in the isolated groove 3, so that the cooling medium can directly flow through the core heat source area, thereby establishing a zero distance contact path between the heat source and the cooling medium, significantly reducing the thermal resistance in the stator, and improving the heat dissipation efficiency; at the same time, the inner wall of the isolated groove 3 is covered with a nanometer ceramic insulation layer, which realizes electrical isolation between phases while ensuring high thermal conductivity, thereby effectively improving the interphase insulation strength of the stator and preventing arc breakdown.

[0078] Further, by arranging the windings in a three-dimensional radial, axial and circumferential staggered manner, micro-channel passages are formed between the coil layers, and when the cooling medium flows through the passages, turbulent flow disturbances are generated, thereby destroying the laminar boundary layer and strengthening convective heat transfer, achieving active heat dissipation inside the stator conductor; at the same time, the circumferential staggered structure induces the end cooling medium to form a vortex flow field, thereby achieving uniform turbulent heat exchange coverage in the end region and preventing local heat accumulation.

[0079] Furthermore, by forming a closed circulation with the annular header and the external cooling system, and combining the flow distribution valve and the temperature sensing unit to achieve dynamic adjustment of the cooling flow, the cooling medium can adaptively distribute the flow according to the temperature distribution of each tooth 4, thereby achieving thermal field equalization control.

[0080] Therefore, by the cooperative design of the through cooling of the isolation groove 3 + three-dimensional staggered arrangement of the windings + dynamic fluid regulation, the coupling optimization of the stator structure, thermal management and insulation protection is achieved, so that the motor can still maintain low temperature rise, uniform temperature operation and high insulation reliability under high power density conditions. Compared with the prior art, the cooling efficiency can be increased by about 40%, the stator temperature rise can be reduced by about 20℃, and the inter-phase breakdown voltage can be increased by about 30% under the same volume conditions, thereby significantly enhancing the safety and stability of the motor.

[0081] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A concentrated winding motor phase isolation and winding arrangement structure, characterized in that, The motor stator comprises a stator yoke (1), a slot (2), a tooth portion (4), and an isolation groove (3) arranged in the center of the tooth portion (4). The slot (2) is formed between adjacent tooth portions (4) for embedding concentrated winding coils, and the isolation groove (3) is filled with insulating cooling medium and is in communication with an external cooling system. The winding is arranged in a staggered manner in the radial and axial directions, so that through cooling flow channels are formed between the conductor layers, the isolation groove (3) serves as a cooling main channel and is in communication with the cooling channels formed by the staggered winding, and a three-dimensional composite cooling system is constructed to realize direct cooling, heat flow balance, and phase-to-phase insulation of the core area of the tooth portion (4).

2. The concentrated winding machine phase isolation and winding arrangement structure of claim 1, wherein, The cross section of the isolation groove (3) is in a trapezoidal structure, and the opening near the rotor side is wider than the opening near the stator yoke (1) to form a flow velocity gradient and improve the flow distribution of the cooling medium.

3. The phase-to-phase isolation and winding arrangement structure of the concentrated winding motor according to claim 2, characterized in that, The inner wall of the isolation groove (3) is covered with a nano ceramic insulation layer to realize magnetic flux shielding between phases while conducting heat.

4. The concentrated winding machine phase isolation and winding arrangement structure according to any one of claims 1-3, characterized in that, The winding is arranged in a staggered manner in the radial direction, wherein: The odd-numbered slot position coils A1, A3, B2, B4, C1, and C3 are offset by 15 mm towards the center of the circle, The even-numbered slot position coils A2, A4, B1, B3, C2, and C4 are offset by 15 mm towards the stator yoke (1), to form a stepped penetrating cooling flow channel in the slot depth direction, and the cooling medium can flow radially between adjacent conductor layers to realize interlayer convection heat transfer.

5. The concentrated winding machine phase isolation and winding arrangement structure of claim 4, wherein, The winding is arranged in a staggered manner in the axial direction, and the even-numbered coils are offset by 50 mm along the motor axis direction to form a longitudinal through cooling gap at the end portion, so that the cooling medium forms a continuous flow channel in the axial direction at the end portion of the conductor to realize longitudinal cooling between the conductor layers.

6. The concentrated winding machine phase isolation and winding arrangement structure of claim 5, wherein, The end portions of the phase windings are arranged asymmetrically in the circumferential direction, so that the intersection points of the three-phase winding end portions are offset in the circumferential direction to form a vortex flow path at the end portion of the motor, wherein: The mechanical angle between adjacent tooth portions (4) at the bottom is 32°, and the mechanical angle between the remaining tooth portions (4) is 29.5° to form a vortex flow path in the end portion area and construct a self-organizing turbulent flow field.

7. A cooling method for a concentrated winding machine phase isolation and winding arrangement according to any one of claims 1-6, characterized in that, The method comprises the following steps: S1, injecting cooling medium into the annular header through an external cooling system, the cooling medium being insulating oil or water-glycol mixture, and flowing into the isolation groove (3) inlet under the driving of a cooling pump and along the stator axial direction; S2, the cooling medium flows in the axial direction in the isolation groove (3) and directly exchanges heat with the internal metal core and winding side wall of the tooth portion (4) to realize direct cooling of the core heat source area of the tooth portion; S3, after the cooling medium flows out of the isolation groove (3), part of the fluid enters the micro-flow channel formed by the staggered winding layers in the radial and axial directions, generates local disturbance and forms convection flow to strengthen heat exchange and reduce local temperature rise; S4, the cooling medium continues to flow to the end portion of the motor to form a rotating flow path through the circumferential staggered structure of the end portion winding, and a vortex flow is generated in the end portion area to realize end portion heat exchange. S5, the cooling medium returns to the external cooling circulation system through the outlet of each isolation groove (3) and the end header, and is recycled after being cooled by a heat exchanger, thereby forming a closed cooling loop.

8. The concentrated winding machine phase isolation and winding arrangement cooling method of claim 7, wherein, The isolation groove (3) is connected with the micro flow channel formed by the radially staggered winding and the vortex flow channel formed by the end stagger, and together forms a continuous three-dimensional cooling path, so that the cooling medium forms a through-flow network in the stator.

9. The concentrated winding machine phase isolation and winding arrangement cooling method of claim 8, wherein, The cooling medium directly contacts the core heat source area of the tooth part (4) through the isolation groove (3) during axial flow, and forms a multidirectional flow channel between the winding layers and the end space, so as to realize uniform heat transfer and heat dissipation in the stator.

10. A method of cooling a concentrated winding machine phase isolation and winding arrangement structure according to any of claims 9, characterized in that, The cooling medium sequentially passes through the isolation groove (3), the winding micro flow channel and the end vortex flow channel during circulation, thereby forming a heat source-medium zero-distance heat exchange path, so that the overall temperature rise of the stator is stable under the condition of high power density operation.

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