Insulation structure used between winding and iron core of motor stator

Abstract

The invention discloses an insulation structure used between a winding and an iron core of a motor stator, which comprises a framework, the framework comprises a wire outlet end and a non-wire outlet end, one end of the wire outlet end and one end of the non-wire outlet end are respectively provided with an avoiding clamping groove group, the side wall of the wire outlet end is provided with a side wall wire clamping groove, and an anti-rebound mechanism is arranged in the side wall wire clamping groove. One end of the leading-out terminal and one end of the non-leading-out terminal are respectively provided with a busbar positioning groove, two sides of the leading-out terminal and two sides of the non-leading-out terminal are respectively provided with a winding groove, the busbar positioning grooves are used for being matched with flanges on a busbar, so that the relative position between the busbar and the framework is fixed, and the winding grooves are used for automatically guiding winding. The structure has the beneficial effects that the high-speed winding stability and the production efficiency are greatly improved, specifically, the winding grooves are formed in the insulating frameworks of the wire outlet end and the non-wire outlet end, the length of the winding grooves covers more than 95% of the groove depth of the iron core, notches are provided with inwards-bent arc-shaped flanges, and a closed guide channel is formed, and the structure can effectively prevent enameled wires from derailing.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of air filtration, and particularly relates to an insulation structure for the winding and the iron core of a motor stator. BACKGROUND

[0002] The motor stator is an important component of a motor such as a generator and a starter. The stator is an important part of the motor. The stator is composed of a stator core, a stator winding and a machine base. The main function of the stator is to generate a rotating magnetic field, and the main function of the rotor is to be cut by the magnetic lines of force in the rotating magnetic field to generate (output) current.

[0003] The insulation framework is the core insulation component of the motor stator, and bears the key functions of electrical isolation, winding positioning and providing structural support at high temperature. However, the insulation framework in the prior art, especially the stator applied to high slot fill rate and automatic winding scene, has many bottleneck problems to be solved: Firstly, in the high-speed winding process, the winding slot of the existing insulation framework often has the problems of insufficient slot length or lack of effective limiting structure of the slot opening, which causes the enameled wire to easily derail and jump during the high-speed winding process, forcing the production line to run at a lower speed and requiring manual intervention for correction, which seriously restricts the production efficiency and product consistency; Secondly, in the subsequent assembly process: when the stator is assembled into a circle and the bus bar is installed, due to the lack of wire harness management structure designed for the assembly process in the side wall of the existing framework, the operator often needs to manually bend the wire harness to create operating space, which can easily cause two types of failures: one is that the enameled wire is rubbed against the sharp edge of the insulation framework, causing the insulation layer to be scratched, which poses an electrical safety hazard; the other is that the wire harness rebounds, causing the bus bar to be installed out of position, which needs to be disassembled and reassembled, greatly reducing the assembly efficiency and reliability; Furthermore, in terms of materials and long-term reliability, the current mainstream material is PA6+15% glass fiber, which has difficulty in meeting the demand of higher power density motors in terms of heat resistance. Under the continuous working temperature of 180℃, the material has insufficient thermal deformation temperature margin, causing significant thermal contraction (about 0.15-0.2mm) of the slot opening, and further causing the slot fill rate to decrease by 5-7%, directly affecting the performance and life of the motor. At the same time, the heat generated by the winding cannot be efficiently conducted to the stator core through the insulation framework, causing local overheating and further accelerating the aging of the insulation material; therefore, in order to solve the above problems, an insulation structure for the winding and the iron core of a motor stator is provided. SUMMARY

[0004] The purpose of the present application is to provide an insulation structure for the winding and the iron core of a motor stator to solve the problems raised in the background.

[0005] To solve the above technical problems, the present application is realized by the following technical scheme: The application discloses an insulation structure for the winding and the core of a motor stator, which comprises a framework, the framework comprises a wire outlet end and a non-wire outlet end, the wire outlet end and the non-wire outlet end are used in pairs and are respectively installed at the two ends of the same section of the stator core along the axial direction; one end of the wire outlet end and the non-wire outlet end is provided with an avoiding clamping groove group, the side wall of the wire outlet end is provided with a side wall wire clamping groove, and a rebound prevention mechanism is arranged in the side wall wire clamping groove; the avoiding clamping groove group is used for pressing the enameled wire, the side wall wire clamping groove is used for limiting the position of the enameled wire tail, and the rebound prevention mechanism is used for preventing the enameled wire tail from falling off from the side wall wire clamping groove; one end of the wire outlet end and the non-wire outlet end is provided with a busbar positioning groove, and both sides of the wire outlet end and the non-wire outlet end are provided with a winding groove; the busbar positioning groove is used for cooperating with the flange on the busbar, so that the relative position between the busbar and the framework is fixed, and the winding groove is used for automatically guiding the winding.

[0006] Preferably, the rebound prevention mechanism comprises a group of guide plates, one surface of the guide plate is provided with a guide inclined surface, one surface of the guide plate is provided with a guide inclined surface, the inside of the guide plate is provided with a plurality of mounting grooves, a spring is fixedly arranged in the mounting groove, one end of the spring is fixedly connected with a push plate, one surface of the push plate is fixedly provided with a blocking rod, one end of the blocking rod is fixedly provided with a blocking plate, and the blocking plate cooperates with the spring to block the enameled wire tail and prevent the enameled wire tail from falling off.

[0007] Preferably, the bottom end of the non-wire outlet end is provided with a plurality of heat dissipation cavities, a heat dissipation enhancement mechanism is fixedly arranged in the heat dissipation cavity, the heat dissipation enhancement mechanism comprises a flexible heat conduction layer, an electromagnetic shielding layer and a heat conduction insulation layer, the flexible heat conduction layer and the heat conduction insulation layer are respectively fixedly arranged on the two sides of the electromagnetic shielding layer, the flexible heat conduction layer is used for filling the micro-uneven surface to greatly reduce the contact thermal resistance, the electromagnetic shielding layer is used for inhibiting the high-frequency common-mode current to eliminate the shaft current, and the heat conduction insulation layer is used for realizing efficient heat conduction and electrical isolation.

[0008] Preferably, the slot opening of the winding groove is provided with inwardly curved arc-shaped flanges on both sides to form a closed guiding channel.

[0009] Preferably, the material of the wire outlet end and the non-wire outlet end is PA+% glass fiber.

[0010] Preferably, the blocking plate and the blocking rod are in sliding cooperation with the guide plate.

[0011] Preferably, the two guide inclined surfaces arranged on the two guide plates form a reduced entry slot.

[0012] Preferably, the bottom end of the non-wire outlet end is fixedly provided with a plurality of protrusions, one end of the flexible heat conduction layer is fixedly provided with a heat conduction boss, the protrusions are in contact with the end face of the stator core to limit the final assembly position and gap between the framework and the core and provide main structural support for the framework.

[0013] Preferably, the heat-conducting boss is made of a heat-conducting material with a higher thermal expansion coefficient than the framework, and the height of the heat-conducting boss is greater than the height of the protrusion, so that the heat-conducting boss can generate an additional expansion pressure when the working temperature rises, and adaptively enhance the contact pressure with the end surface of the stator core.

[0014] The present application has the following beneficial effects: 1. The present application has the beneficial effect of greatly improving the stability and production efficiency of high-speed winding, specifically, the winding slot is arranged on the wire outlet end and the non-wire outlet end insulation framework, the length covers more than 95% of the core slot depth, and the slot opening has an inwardly curved arc-shaped flange to form a closed guide channel. This structure can effectively prevent the enameled wire from derailing; 2. The present application has the beneficial effect of completely eliminating the interference assembly of the wire harness after grouping, specifically, the side wall wire clamping groove is provided, and the anti-rebound limiting mechanism is integrated inside the side wall wire clamping groove. This mechanism can reliably lock the tail end of the enameled wire in one direction; 3. The present application has the effect of greatly improving the assembly efficiency of the busbar and avoiding scratching the wire harness, specifically, the avoiding clamping groove group is designed on the side wall of the wire outlet end, the groove direction of the avoiding clamping groove group intersects with the grouping direction, and the depth is different. This structure provides a preset and precise avoiding space for the installation of the busbar; 4. The present application has the beneficial effect of maintaining ultra-high dimensional stability and slot fill rate under high temperature working conditions, specifically, the PA66+30% glass fiber material with a heat resistance level of H level (180℃) is used to injection mold the insulation framework. This material ensures the anti-creep ability and low thermal shrinkage rate under high temperature; 5. The present application has the effect of significantly reducing the winding working temperature and improving the motor power density and life, specifically, the heat-conducting boss is provided with a heat dissipation enhancement mechanism at the bottom of the non-wire outlet end. This structure establishes an efficient heat conduction path from the winding to the stator core.

[0015] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application; Figure 2 It is a schematic diagram of the bottom side structure of the present application; Figure 3 is a schematic diagram of the perspective structure of the outgoing end of the application; Figure 4 is a schematic diagram of the perspective structure of the non-outgoing end of the application; Figure 5 is a schematic diagram of the perspective structure of the outgoing end of the application; Figure 4 is a schematic diagram of the perspective structure of the outgoing end of the application; Figure 6 is a schematic diagram of the perspective structure of the outgoing end of the application; Figure 1 is a schematic diagram of the perspective structure of the outgoing end of the application; Figure 7 is a schematic diagram of the anti-rebound mechanism of the application; Figure 8 is a schematic diagram of the anti-rebound mechanism of the application; Figure 9 is a schematic diagram of the heat dissipation mechanism of the application.

[0018] In the drawings, the components represented by each reference numeral are listed as follows: 1, skeleton; 2, outgoing end; 3, non-outgoing end; 4, avoidance slot group; 5, side wall wire slot; 6, female bus positioning slot; 7, winding slot; 8, protrusion; 9, heat-conducting boss; 10, heat dissipation cavity; 11, heat dissipation enhancement mechanism; 12, guide plate; 13, guide slope; 14, stop lever; 15, baffle; 16, mounting slot; 17, spring; 18, push plate; 19, flexible heat-conducting layer; 20, electromagnetic shielding layer; 21, heat-conducting insulation layer. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0020] In the description of the application, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicate the orientation or positional relationship, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the indicated component or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0021] Please refer to Figures 1-9 , the application is an insulation structure between the winding and the core of a motor stator, which comprises a skeleton 1, the skeleton 1 comprises an outgoing end 2 and a non-outgoing end 3, the material of the outgoing end 2 and the non-outgoing end 3 is PA66+30% glass fiber, the outgoing end 2 and the non-outgoing end 3 are used in pairs and are respectively installed at the two ends of the same segment of the stator core along the axial direction; The outgoing end 2 and one end of the non-outgoing end 3 are provided with a set of avoiding clamping grooves 4, which are a set of linear grooves provided on the end surface of the framework 1, and the groove extension direction intersects the tangent direction of the stator group circle (i.e. parallel to the busbar installation path), which provides a preset and accurate wire harness avoiding space for the operator when installing the busbar, and the operator can directly press the wire harness into the corresponding groove to instantly release the installation space without manually bending the wire, thereby eliminating the risk of scratching the insulating paint and greatly improving the assembly efficiency; The side wall of the outgoing end 2 is provided with a side wall clamping groove 5, which is a U-shaped or C-shaped open groove, which is used to accommodate and regularize the tail end part of the enameled wire during the stator group circle step, prevent multiple wire harnesses from being scattered and intertwined, and limit the position of the enameled wire tail to avoid the problem that the tail position may interfere with the stator core group circle. If there is no side wall clamping groove 5, the enameled wire tail position may need to be manually adjusted when installing the busbar during the group circle step, which may cause damage to the enameled wire insulation layer or cause the busbar position to be incorrect; The outgoing end 2 and one end of the non-outgoing end 3 are provided with a busbar positioning groove 6, which is a clamping groove (such as a square, circular or special-shaped groove) matching the flange on the busbar, which is used to embed the flange on the busbar to achieve precise positioning and pre-fixing of the busbar on the framework, and prevent it from shifting during the pressing process; The outgoing end 2 and the non-outgoing end 3 are provided with winding grooves 7 on both sides, and the winding grooves 7 are provided with inwardly curved arc-shaped flanges on both sides of the groove opening. The flange is a smooth arc shape, which is used to constrain the enameled wire from above and side, forming a closed or semi-closed guide channel, which fundamentally eliminates the risk of enameled wire jumping and derailing during high-speed winding, and the length covers more than 95% of the stator core slot depth, providing axial positioning and support for the enameled wire penetrating the core slot.

[0022] The anti-rebound mechanism is arranged in the side wall clamping wire slot 5, and the anti-rebound mechanism is used for one-way locking of the pressed-in enameled wire, preventing the enameled wire from rebounding and falling off due to its own stress or vibration. The anti-rebound mechanism comprises a group of guide plates 12, one surface of the guide plate 12 is provided with a guide slope 13, one surface of the guide plate 12 is provided with a guide slope 13, and the two guide slopes 13 arranged on the two guide plates 12 form a reduced entry slot. The guide slope 13 is shaped as a smooth slope, is formed at the entrance of the guide plate 12, and has the function of guiding the enameled wire to be smoothly pressed into the deep part of the clamping wire slot and converting the pressing force into a component force for moving the baffle 15. A plurality of mounting grooves 16 are formed in the guide plate 12, and a spring 17 is fixedly arranged in the mounting groove 16. The spring 17 is used for providing the baffle 15 with continuous rebound force, so as to ensure the reliability of the locking. One end of the spring 17 is fixedly connected with a push plate 18, one surface of the push plate 18 is fixedly provided with a stop rod 14, one end of the stop rod 14 is fixedly provided with the baffle 15, and the baffle 15 is used for being reset to the locking position under the pushing of the spring 17 after the cable is pressed in, so as to form a physical barrier and mechanically prevent the cable from exiting. The baffle 15 and the stop rod 14 are in sliding cooperation with the guide plate 12. The baffle 15 cooperates with the spring 17 to block the tail wire of the enameled wire, so as to prevent the tail wire from falling off. The bottom end of the non-outgoing wire end 3 is provided with a plurality of heat dissipation cavities 10, and the heat dissipation cavity 10 is fixedly provided with a heat dissipation enhancement mechanism 11. The heat dissipation enhancement mechanism 11 comprises a flexible heat conduction layer 19, an electromagnetic shielding layer 20 and a heat conduction insulation layer 21. The heat conduction insulation layer 21 is combined with the framework 1 and is matched with the shape of the heat dissipation cavity 10, so as to efficiently absorb the heat generated by the winding and ensure the electrical insulation between the winding. The electromagnetic shielding layer 20 is used for forming a very high impedance to the high-frequency common-mode current generated by the PWM drive by using the characteristics of the soft magnetic material, so as to inhibit the flow and eliminate the shaft current, thereby protecting the motor bearing. The flexible heat conduction layer 19 and the heat conduction insulation layer 21 are fixedly arranged on the two sides of the electromagnetic shielding layer 20 respectively. The flexible heat conduction layer 19 is in contact with the stator core. The material is soft and compressible, can exclude air, is used for filling the micro-uneven surface to greatly reduce the contact thermal resistance, and has a high thermal expansion coefficient. When the working temperature of the motor rises, the expansion of the material can adaptively increase the pressing force of the heat conduction boss 9 to the end surface of the stator core, so as to dynamically reduce the contact thermal resistance and improve the heat dissipation efficiency under high-temperature working conditions. The bottom end of the non-outgoing wire end 3 is fixedly provided with a plurality of protrusions 8, one end of the flexible heat conduction layer 19 is fixedly provided with a heat conduction boss 9, the protrusion 8 is in contact with the end surface of the stator core, so as to limit the final assembly position and gap between the framework 1 and the core, and provide the framework 1 with main structural support.

[0023] The heat-conducting boss 9 is made of a heat-conducting material with a higher thermal expansion coefficient than the skeleton 1. The height of the heat-conducting boss 9 is greater than the height of the protrusion 8. The heat-conducting boss 9 is in a columnar, island or strip structure protruding downward from the flexible heat-conducting layer 19. Its function is to concentrate the contact pressure, penetrate the possible assembly gap, ensure the formation of a close and low thermal resistance physical contact with the surface of the stator core, and enable the heat-conducting boss 9 to generate an additional expansion compression force when the working temperature rises, thereby adaptively enhancing the contact pressure with the end surface of the stator core.

[0024] Working principle: The outgoing end 2 and the non-outgoing end 3 are respectively pressed into the two ends of the segmented stator core, the enameled wire is embedded into the winding slot 7 using a high-speed winding machine, and the arc-shaped flange can effectively prevent the wire from jumping; the multiple wound stator segments are preliminarily surrounded into a circle, the tail ends of the enameled wires of each segment are sequentially pressed into the guide slope 13 of the side wall wire clamping slot 5, after encountering the baffle 15, the baffle 15 is pushed to both sides by applying pressure to the baffle 15, the baffle 15 is pushed by the baffle rod 14 to compress the spring 17, so that a gap appears between the two baffles 15, the enameled wire tail passes through the gap, and then the spring 17 resets to push the baffle 15 to reset and lock; the wire heads at the adjacent positions of the stator segments after grouping are welded, the wire harness part that may be hindered after welding is installed is accurately pressed into the corresponding slot of the avoiding slot group 4 according to its position, then the flange on the bus bar is aligned with the bus bar positioning slot 6, and is pressed down and fixed; the wire harness is reset by light pushing, and finally the electrical connection between the enameled wire and the bus bar is performed, that is, a complete stator is obtained, the protrusion 8 is in contact with one end of the stator core, so that a gap appears between the non-outgoing end 3 and the stator core, and the final installation height of the skeleton is determined, the gap forces heat to be unable to dissipate from a large-area low-efficiency interface, but must be conducted through a designed efficient path, that is, the heat-conducting boss 9, to realize the optimized management of heat flow, the heat-conducting boss 9 concentrates the local contact pressure, ensures that the point can penetrate the possible assembly gap, and forms a tight, efficient heat-conducting interface with the surface of the stator core with the largest physical contact area, the flexible heat-conducting layer 19 greatly reduces the interface contact thermal resistance, when the motor operates, a large amount of heat is generated due to copper loss and iron loss of the winding, the heat-conducting insulation layer 21 can efficiently capture and absorb the heat due to the indirect contact between the winding and the skeleton 1 and the fact that the heat-conducting coefficient of the heat-conducting insulation layer 21 is much higher than that of ordinary plastic, while absorbing heat, the layer can also rapidly diffuse the heat from the point or linear heat source of the winding to the entire plane direction, avoid local overheating, and form a uniform heat source surface, finally, the absorbed and homogenized heat is efficiently transmitted to the adjacent electromagnetic shielding layer 20 through molecular thermal vibration, the electromagnetic shielding layer 20 presents a very high inductance to high-frequency current, although its main function is electromagnetic shielding, the nanocrystalline / amorphous alloy of the metal material itself is also a good heat conductor, therefore, it will not become a “bottleneck” of heat, but can almost without loss conduct the heat from the heat-conducting insulation layer 21 to the flexible heat-conducting layer 16, and act as a “bridge” in the heat transfer process, the heat reaching the layer is rapidly transmitted to the heat-conducting boss 9 on the lower surface thereof through the high heat conductivity of the layer, and finally the heat is completely “dumped” to the stator core through the tight contact between the heat-conducting boss 9 and the stator core, and is dissipated to the outside environment from the stator core and the motor shell, to complete the entire heat dissipation cycle.

[0025] In the description of the specification, reference to "one embodiment", "an example", "a specific example" or the like means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "an example", "a specific example" or the like in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0026] The preferred embodiments of the application disclosed above are only to help explain the application. The preferred embodiments do not describe all the details of the application and limit the application to the specific embodiments described. Obviously, many modifications and variations can be made in light of the contents of the specification. The specification selects and specifically describes these embodiments in order to better explain the principles and practical application of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their full scope and equivalents.

Claims

1. An insulation structure for the winding and core of a motor stator, comprising a skeleton (1), the skeleton (1) comprising a lead-out end (2) and a non-lead-out end (3), the lead-out end (2) and the non-lead-out end (3) being used in pairs and being respectively installed at the two ends of the same section of the stator core along the axial direction thereof; characterized in that One end of the lead-out end (2) and the non-lead-out end (3) is provided with an avoiding clamping groove group (4), the side wall of the lead-out end (2) is provided with a side wall clamping groove (5), and the side wall clamping groove (5) is provided with an anti-rebound mechanism; the avoiding clamping groove group (4) is used to press the enameled wire, the side wall clamping groove (5) is used to limit the position of the enameled wire tail, and the anti-rebound mechanism is used to prevent the enameled wire tail from falling off from the side wall clamping groove (5); One end of the lead-out end (2) and the non-lead-out end (3) is provided with a busbar positioning groove (6), and both sides of the lead-out end (2) and the non-lead-out end (3) are provided with a winding groove (7); the busbar positioning groove (6) is used to cooperate with the flange on the busbar, so as to fix the relative position between the busbar and the skeleton (1), and the winding groove (7) is used to automatically guide the winding.

2. An insulation structure for a stator of an electric machine according to claim 1, characterized in that, The anti-rebound mechanism comprises a group of guide plates (12), one surface of the guide plate (12) is provided with a guide inclined surface (13), one surface of the guide plate (12) is provided with a guide inclined surface (13), the inside of the guide plate (12) is provided with a plurality of mounting grooves (16), the mounting grooves (16) are fixedly provided with springs (17), one end of the spring (17) is fixedly connected with a push plate (18), one surface of the push plate (18) is fixedly provided with a blocking rod (14), one end of the blocking rod (14) is fixedly provided with a blocking plate (15), and the blocking plate (15) cooperates with the spring (17) to block the enameled wire tail and prevent it from falling off.

3. An insulation structure for a stator of an electric machine according to claim 1, characterized in that, The bottom end of the non-lead-out end (3) is provided with a plurality of heat dissipation cavities (10), and the heat dissipation cavities (10) are fixedly provided with a heat dissipation enhancement mechanism (11); the heat dissipation enhancement mechanism (11) comprises a flexible heat conduction layer (19), an electromagnetic shielding layer (20) and a heat conduction insulation layer (21); the flexible heat conduction layer (19) and the heat conduction insulation layer (21) are respectively fixedly arranged on both sides of the electromagnetic shielding layer (20); the flexible heat conduction layer (19) is used to fill the micro-uneven surface to greatly reduce the contact thermal resistance; the electromagnetic shielding layer (20) is used to inhibit the high-frequency common-mode current to eliminate the shaft current; and the heat conduction insulation layer (21) is used to realize efficient heat conduction and electrical isolation.

4. An insulation structure for a stator of an electric machine according to claim 1, characterized in that, The slot opening of the winding groove (7) is provided with inwardly curved arc-shaped flanges on both sides to form a closed guiding channel.

5. An insulation structure for electric machines according to claim 1, characterized in that, The material of the lead-out end (2) and the non-lead-out end (3) is PA66+30% glass fiber.

6. An insulation structure for a stator of an electric machine according to claim 2, characterized in that, The blocking plate (15) and the blocking rod (14) are in sliding cooperation with the guide plate (12).

7. An insulation structure for electric machines according to claim 2, characterized in that, The two guide inclined surfaces (13) arranged on the two guide plates (12) constitute a reduced entry slot.

8. An insulation structure for a stator of an electric machine according to claim 3, characterized in that, The bottom end of the non-outlet end (3) is fixed with a plurality of protrusions (8), and one end of the flexible heat-conducting layer (19) is fixed with a heat-conducting boss (9). The protrusions (8) are in contact with the end face of the stator core to define the final assembly position and gap between the skeleton (1) and the core, and to provide the skeleton (1) with the main structural support.

9. An insulation structure for a stator of an electric machine according to claim 8, characterized in that The heat-conducting boss (9) is composed of a heat-conducting material with a higher thermal expansion coefficient than the skeleton (1), and the height of the heat-conducting boss (9) is greater than the height of the protrusions (8), so that the heat-conducting boss (9) can generate an additional expansion pressure when the working temperature rises, and adaptively enhance the contact pressure with the end face of the stator core.

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