Stator assembly of a servo motor

Abstract

The utility model belongs to stator subassembly technical field especially a kind of stator subassembly of servo motor, including stator core, the outer surface of stator core is provided with insulation device, the insulation device includes insulation frame, and the stator core is insulated by insulation frame. The stator subassembly of servo motor, by setting insulation device, so that stator subassembly structure is stable and insulation reliable, reduce the risk of failure, insulation frame and support ring are all used H-grade temperature-resistant insulation material, cooperate the insulation film between layers of coil winding, the insulation characteristics of heat conduction sheet, form multiple insulation protection, can effectively prevent the internal short circuit of stator subassembly, simultaneously, the fixation of locating pin to support ring, the transition fit of heat dissipation sleeve and core, the hot-jacket connection of heat conduction ring and heat dissipation sleeve, ensure that stator subassembly is not loose, displacement when motor high-speed operation, structural stability improves, reduce the noise and failure probability caused by structural vibration.

Description

Technical Field

[0001] This utility model relates to the field of stator assembly technology, and in particular to a stator assembly for a servo motor. Background Technology

[0002] The stator assembly, or stator for short, is the stationary part of an electric motor (electric motor or generator). It works in conjunction with the rotating rotor assembly to convert electrical energy into mechanical energy through electromagnetic induction.

[0003] Chinese Patent CN219067933U discloses a stator assembly for a servo motor, relating to the field of stator assemblies. It includes a stator base with an inner mounting groove for a stator coil. A positioning mechanism is fixedly mounted on the surface of the stator base. The positioning mechanism includes a positioning seat, a movable groove, a rotating roller groove, an inlet / outlet notch, and a limiting through hole. A limiting mechanism is provided within the positioning seat, comprising a movable shaft, a limiting rotating roller, a limiting protrusion, a receiving groove, a limiting screw, and a limiting screw hole. After unscrewing the limiting screw, the movable shaft can rotate within the movable groove. This allows the limiting rotating roller to rotate 180°, aligning the limiting protrusion with the receiving groove. Once aligned, the limiting protrusion detaches from the motor housing and falls into the receiving groove. When all the limiting protrusions have detached from the motor housing, the stator base becomes loose, facilitating stator removal by the user.

[0004] However, the poor heat dissipation of the stator assembly in the above technical solution will cause the stator assembly to generate a lot of heat during operation, which will easily lead to high internal temperature of the motor. If heat dissipation cannot be carried out in time, it will not only easily cause heat to accumulate inside the motor, but also reduce the service life of the servo motor under long-term operation. Summary of the Invention

[0005] Based on the technical problems of poor heat dissipation of existing stator components, which easily leads to heat accumulation inside the motor and reduces the service life of the servo motor under long-term operation, this utility model proposes a stator component for a servo motor.

[0006] The present invention provides a stator assembly for a servo motor, comprising a stator core, wherein an insulating device is provided on the outer surface of the stator core, the insulating device comprising an insulating frame, the insulating frame insulating the stator core; The outer surface of the insulating frame is provided with a heat dissipation device, which includes a heat dissipation sleeve that absorbs heat from the stator core.

[0007] Preferably, the stator core includes a plurality of iron chips stacked sequentially and a heat dissipation layer, wherein the heat dissipation layer fixes and bonds adjacent iron chips together, and the heat dissipation layer is made of epoxy resin adhesive.

[0008] Through the above technical solution, the stator core uses cold-rolled non-oriented silicon steel sheets. Adjacent silicon steel sheets are bonded together through a heat dissipation layer, reducing the air gap inside the core and lowering magnetic resistance and iron loss. This reduces iron loss heating during motor operation while ensuring efficient magnetic energy conversion. The epoxy resin adhesive uses a two-component modified epoxy resin adhesive, and the thickness of the heat dissipation layer is controlled at 0.05-0.1mm. It is uniformly coated between adjacent iron sheets, which not only achieves firm fixation of the iron sheets but also quickly conducts the heat generated by the iron sheets to the outer surface of the core, breaking the thermal barrier problem of traditional lamination.

[0009] Preferably, the insulating frame is sleeved on the outer surface of the stator core, the outer surface of the insulating frame is wound with coil windings, the outer surface of the insulating frame is provided with a support ring, and the inner wall of the support ring and the inner wall of the insulating frame are slidably inserted with positioning pins.

[0010] Through the above technical solution, the insulation frame is made of modified polyimide composite material (with added glass fiber reinforcement), with a temperature resistance rating of H. The insulation frame is a ring structure that fits the stator core, and the inner wall is provided with a 0.2mm thick wear-resistant coating (polytetrafluoroethylene) to avoid long-term friction with the stator core that could lead to insulation damage. The inner wall of the support ring is provided with 2-6 symmetrical positioning holes, and the surface of the positioning pin is passivated. After being inserted into the positioning holes of the support ring and the insulation frame, it can prevent the axial movement of the support ring and ensure the stability of the coil winding position.

[0011] Preferably, the heat dissipation device further includes a heat dissipation groove, which is formed on the outer surface of the stator core. The outer surface of the stator core is slidably inserted into the inner wall of the heat dissipation sleeve, and the outer surface of the protrusion of the heat dissipation sleeve contacts the inner wall of the heat dissipation groove.

[0012] Through the above technical solution, heat dissipation grooves are opened on the outer surface of the stator core. They are axial semi-circular grooves, numbering 6-12. The protrusions of the heat dissipation sleeve contact the heat dissipation grooves, ensuring close contact between the heat dissipation sleeve and the core. At the same time, the heat dissipation grooves increase the contact area between the core and the heat dissipation sleeve, accelerating heat transfer. The main body is made of high thermal conductivity flexible silicone rubber composite material (the base material is methyl vinyl silicone rubber, filled with 60% alumina + 10% boron nitride thermally conductive filler). The heat dissipation sleeve has an annular cylindrical structure with a 0.3mm thick thermally conductive silicone grease coating on the inner wall, eliminating the contact gap with the outer surface of the stator core. It can adapt to the installation error of the motor housing through elastic deformation. During assembly, an "elastic wrapping" installation is adopted, which can achieve a tight fit without additional fasteners.

[0013] Preferably, a heat-conducting ring is fixedly installed on the outer surface of the heat sink, and a heat sink fin is fixedly installed on the outer surface of the heat-conducting ring.

[0014] Through the above technical solution, the heat-conducting ring is made of T2 copper, and the inner diameter of the ring is interference-fitted with the outer diameter of the heat sink. During assembly, a heating sleeve heat fitting process is used to ensure a gapless fit. The heat sink has a comb-like structure to increase the heat dissipation area.

[0015] Preferably, a heat-conducting sheet is fixedly installed on the outer surface of the support ring, and the outer surface of the heat-conducting sheet is in contact with the outer surface of the coil winding.

[0016] The above technical solution uses a flexible thermally conductive silicone sheet. One side of the sheet is fixed to the outer surface of the support ring with high-temperature resistant double-sided adhesive, while the other side is tightly attached to the outer surface of the coil winding. This allows the heat loss from the coil winding to be directly conducted to the support ring, and then transferred to the heat sink through the support ring, forming a heat dissipation path of "coil-thermal conductive sheet-support ring-heat sink".

[0017] The beneficial effects of this utility model are as follows: 1. By setting up insulation devices, the stator assembly structure is made stable and the insulation is reliable, reducing the risk of failure. The insulation frame and support ring are made of H-class heat-resistant insulation material. Combined with the insulation characteristics of the interlayer insulation film of the coil winding and the heat-conducting sheet, multiple insulation protections are formed, which can effectively prevent internal short circuits of the stator assembly. At the same time, the positioning pins fix the support ring, the transition fit between the heat sink and the iron core, and the thermal fit between the heat-conducting ring and the heat sink ensure that the stator assembly does not loosen or shift when the motor is running at high speed. The structural stability is improved, and the noise and failure probability caused by structural vibration are reduced.

[0018] By setting up a heat dissipation device, the stator assembly is provided with heat dissipation. Through the radial heat dissipation path of heat dissipation layer (between iron cores), heat dissipation groove (outside iron core), heat dissipation sleeve, heat conduction ring, and heat dissipation fin (external), as well as the axial heat dissipation path of heat conduction fin (coil), support ring, and heat dissipation sleeve, the heat of the stator assembly is conducted and dissipated in all directions. Compared with the traditional stator that only relies on the iron core for natural heat dissipation, the heat dissipation efficiency is improved, which can reduce the internal temperature of the motor. This solves the technical problem that the heat dissipation effect of the existing stator assembly is poor, which easily leads to heat accumulation inside the motor and reduces the service life of the servo motor under long-term operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a stator assembly of a servo motor according to the present invention. Figure 2 This is a perspective view of the coil winding structure of the stator assembly of a servo motor according to the present invention. Figure 3This is a perspective view of the stator core structure of a servo motor stator assembly according to the present invention. Figure 4 This is a perspective view of the iron chip structure of the stator assembly of a servo motor according to the present invention. Figure 5 This is a perspective view of the heat sink structure of the stator assembly of a servo motor according to the present invention. Figure 6 This is a perspective view of the positioning pin structure of the stator assembly of a servo motor according to the present invention.

[0020] In the diagram: 1. Stator core; 11. Iron core; 12. Heat dissipation layer; 2. Insulation frame; 21. Coil winding; 22. Support ring; 23. Positioning pin; 3. Heat dissipation sleeve; 31. Heat dissipation groove; 32. Heat conduction ring; 33. Heat dissipation fin; 34. Heat conduction fin. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figures 1-6 A stator assembly for a servo motor includes a stator core 1, and an insulating device is provided on the outer surface of the stator core 1. The insulating device includes an insulating frame 2, which insulates the stator core 1.

[0023] Specifically, the stator core 1 includes multiple iron chips 11 stacked in sequence and a heat dissipation layer 12. The heat dissipation layer 12 fixes and bonds adjacent iron chips 11 together. The material of the heat dissipation layer 12 is epoxy resin adhesive.

[0024] The stator core 1 is made of cold-rolled non-oriented silicon steel sheets, model 35W250, laminated together. The silicon steel sheet thickness is 0.35mm, iron loss ≤2.5W / kg (at 50Hz frequency), permeability ≥1.5T (rated magnetic flux density), single-sheet groove accuracy ±0.02mm, and lamination coefficient ≥0.95 (core density after lamination ≥7.6g / cm³). Reducing the internal air gap of stator core 1 lowers magnetic reluctance and iron loss, thus reducing iron loss heating during motor operation while ensuring efficient magnetic energy conversion. The outer diameter accuracy of the iron sheet 11 is controlled at IT6 level to ensure proper bonding with the insulation frame. The bonding of the 2 components is achieved by using a two-component modified epoxy resin adhesive (main component E-51 epoxy resin + curing agent polyamide 650, ratio 10:3). After curing, the thermal conductivity is 1.0 W / (m・K), the shear bond strength is ≥18 MPa (at 25℃), the temperature resistance range is -40℃ to 200℃, and the thickness of the heat dissipation layer 12 is controlled at 0.05-0.1 mm. It is uniformly coated between adjacent iron chips 11, which not only achieves a firm fixation of the iron chips 11, but also quickly conducts the heat generated by the iron chips 11 to the outer surface of the stator core 1, breaking the traditional thermal barrier problem of lamination.

[0025] Specifically, the insulating frame 2 is sleeved on the outer surface of the stator core 1, the outer surface of the insulating frame 2 is wound with coil winding 21, the outer surface of the insulating frame 2 is provided with a support ring 22, and the inner wall of the support ring 22 and the inner wall of the insulating frame 2 are slidably inserted with a positioning pin 23.

[0026] Through the above technical solution, the insulation frame 2 is made of modified polyimide composite material (with added glass fiber reinforcement), achieving a temperature resistance rating of H (long-term resistance to 180℃, short-term resistance to 220℃). The insulation frame 2 is a ring structure that fits snugly against the stator core 1, with a 0.2mm thick wear-resistant coating (polytetrafluoroethylene) on the inner wall to prevent insulation damage caused by long-term friction with the stator core 1. The gap between the inner wall diameter and the outer diameter of the stator core 1 is controlled at 0.03-0.05mm to ensure a tight fit. The material is glass fiber reinforced epoxy resin (glass... The fiber content is 30%, the bending strength is ≥130MPa, the impact strength is ≥15kJ / m², the temperature resistance is H grade, the inner wall is provided with 2-6 symmetrical positioning holes, the coaxiality with the positioning holes of the insulation frame 2 is ≤0.02mm, the material is 304 stainless steel, the diameter is φ5mm, the length is 2mm longer than the thickness of the support ring 22, the surface of the positioning pin 23 is passivated, after being inserted into the positioning holes of the support ring 22 and the insulation frame 2, the fit gap is ≤0.02mm, which can prevent the axial movement of the support ring 22 and ensure the stability of the coil winding 21.

[0027] By setting up insulation devices, the stator assembly structure is made stable and the insulation is reliable, reducing the risk of failure. Both the insulation frame 2 and the support ring 22 are made of H-class heat-resistant insulation material. Together with the interlayer insulation film of the coil winding 21 and the insulation characteristics of the heat-conducting sheet 34, multiple insulation protections are formed, which can effectively prevent internal short circuits in the stator assembly. At the same time, the positioning pin 23 fixes the support ring 22, the heat sink 3 transitions with the iron core, and the heat-conducting ring 32 is thermally connected to the heat sink 3, ensuring that the stator assembly does not loosen or shift when the motor is running at high speed. This improves the structural stability and reduces the probability of noise and failure caused by structural vibration.

[0028] The outer surface of the insulating frame 2 is provided with a heat dissipation device, which includes a heat dissipation sleeve 3, which absorbs the heat on the stator core 1.

[0029] Specifically, the heat dissipation device also includes a heat dissipation groove 31, which is formed on the outer surface of the stator core 1. The outer surface of the stator core 1 is slidably inserted into the inner wall of the heat dissipation sleeve 3, and the outer surface of the protrusion of the heat dissipation sleeve 3 is in contact with the inner wall of the heat dissipation groove 31. Heat dissipation grooves 31 are formed on the outer surface of the stator core 1. They are axial semi-circular grooves, numbering 6-12, with a groove width of 6mm and a groove depth of 4mm. The heat dissipation grooves 31 and the protrusions on the inner wall of the heat dissipation sleeve 3 are in clearance fit (clearance 0.01-0.03mm), with a protrusion height of 3.8mm. This ensures tight contact between the heat dissipation sleeve 3 and the core. At the same time, the heat dissipation grooves 31 increase the contact area between the core and the heat dissipation sleeve 3, accelerating heat transfer. The main body is made of a high thermal conductivity flexible silicone rubber composite material (the base material is methyl vinyl silicone rubber, filled with 60% alumina + 10% boron nitride thermally conductive filler), with a temperature resistance range of -60℃ to 220℃ (super H-grade temperature resistance) and a volume resistivity ≥10¹. 4 Ω・cm (with insulation), the heat dissipation sleeve 3 is an annular cylindrical structure with a 0.3mm thick thermally conductive silicone grease coating on the inner wall to eliminate the contact gap with the outer surface of the stator core 1, and can adapt to the installation error of the motor housing through elastic deformation. During assembly, "elastic wrapping" installation (cold pressure assembly, assembly force 50-80N) is adopted, and it can fit tightly without additional fasteners.

[0030] Specifically, a heat-conducting ring 32 is fixedly installed on the outer surface of the heat sink 3, and a heat sink 33 is fixedly installed on the outer surface of the heat-conducting ring 32.

[0031] The heat-conducting ring 32 is made of T2 copper, with a thickness of 4mm and a width of 12mm. The inner diameter of the ring is an interference fit with the outer diameter of the heat sink 3. During assembly, a heating sleeve (120℃) heat-fitting process is used to ensure a gapless fit. The heat sink 33 has a comb-like structure with a thickness of 1mm, a spacing of 4mm, and a height of 25mm. Each heat sink 33 has 24 pieces, which can quickly dissipate the heat of the heat-conducting ring 32 into the air.

[0032] Specifically, a heat-conducting plate 34 is fixedly installed on the outer surface of the support ring 22, and the outer surface of the heat-conducting plate 34 is in contact with the outer surface of the coil winding 21.

[0033] The support ring 22 is made of flexible thermally conductive silicone sheet (the substrate is silicone + alumina filler), with a thickness of 0.8mm, a thermal conductivity of 2.8W / (m・K), a temperature range of -60℃ to 200℃, and a breakdown voltage of ≥15kV / mm. One side of the thermally conductive sheet 34 is fixed to the outer surface of the support ring 22 with high-temperature resistant double-sided adhesive (temperature resistance 180℃), and the other side is tightly attached to the outer surface of the coil winding 21 (fitting degree ≥95%). It can directly conduct the copper loss heat of the coil winding 21 to the support ring 22, and then transfer it to the heat sink 3 through the support ring 22, forming a heat dissipation path of "coil-thermally conductive sheet 34-support ring 22-heat sink 3".

[0034] By setting up a heat dissipation device, the stator assembly is provided with heat dissipation. Through the radial heat dissipation path of heat dissipation layer 12 (between iron cores 11), heat dissipation groove 31 (outside iron core), heat dissipation sleeve 3, heat conduction ring 32, and heat dissipation fin 33 (external), and the axial heat dissipation path of heat conduction fin 34 (coil), support ring 22, and heat dissipation sleeve 3, the heat of the stator assembly is conducted and dissipated in all directions. Compared with the traditional stator assembly that only relies on the iron core for natural heat dissipation, the heat dissipation efficiency is improved, the internal temperature of the motor can be reduced, and the technical problem of poor heat dissipation effect of existing stator assemblies, which easily leads to heat accumulation inside the motor and reduces the service life of the servo motor under long-term operation is solved.

[0035] Working principle: By coating the iron chips 11 with a heat dissipation layer 12, the iron chips 11 are bonded together to form a stator core 1. After the insulating frame 2 is sleeved on the outside of the stator core 1, the coil winding 21 is wound. Then, the heat dissipation sleeve 3 is sleeved on the outside of the stator core 1, so that the protrusions of the heat dissipation sleeve 3 contact the heat dissipation groove 31. The support ring 22 is fixed to the insulating frame 2 by the positioning pin 23.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A stator assembly for a servo motor, characterized in that: Includes a stator core (1), the outer surface of which is provided with an insulating device, the insulating device including an insulating frame (2), the insulating frame (2) insulating the stator core (1); The outer surface of the insulating frame (2) is provided with a heat dissipation device, which includes a heat dissipation sleeve (3) to absorb heat from the stator core (1).

2. The stator assembly of the servo motor according to claim 1, characterized in that: The stator core (1) includes multiple iron chips (11) stacked in sequence and a heat dissipation layer (12). The heat dissipation layer (12) fixes and bonds adjacent iron chips (11). The material of the heat dissipation layer (12) is epoxy resin adhesive.

3. The stator assembly of the servo motor according to claim 1, characterized in that: The insulating frame (2) is sleeved on the outer surface of the stator core (1). The outer surface of the insulating frame (2) is wound with a coil winding (21). The outer surface of the insulating frame (2) is provided with a support ring (22). The inner wall of the support ring (22) and the inner wall of the insulating frame (2) are slidably inserted with a positioning pin (23).

4. The stator assembly of the servo motor according to claim 3, characterized in that: The heat dissipation device also includes a heat dissipation groove (31), which is formed on the outer surface of the stator core (1). The outer surface of the stator core (1) is slidably inserted into the inner wall of the heat dissipation sleeve (3), and the outer surface of the protrusion of the heat dissipation sleeve (3) is in contact with the inner wall of the heat dissipation groove (31).

5. The stator assembly of the servo motor according to claim 4, characterized in that: A heat-conducting ring (32) is fixedly installed on the outer surface of the heat-conducting sleeve (3), and a heat sink (33) is fixedly installed on the outer surface of the heat-conducting ring (32).

6. The stator assembly of the servo motor according to claim 5, characterized in that: A heat-conducting plate (34) is fixedly installed on the outer surface of the support ring (22), and the outer surface of the heat-conducting plate (34) is in contact with the outer surface of the coil winding (21).

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