A stator coil assembly with improved stability

Abstract

The utility model discloses a kind of stator coil assembly of stable installation, it is related to stator coil assembly field, the utility model includes stator core, stator core is equipped with core slot, and stator winding is equipped in core slot, the outer wall of stator core is equipped with heat-conducting paste, and the side of heat-conducting paste away from stator core is equipped with heat-conducting silica gel pad, the outer wall of stator core is also equipped with locating strip.The metal-based heat-conducting paste (0.05-0.1mm) of the utility model fills micro gap, heat-conducting silica gel pad (0.8-1.2mm) compensates macroscopic error, the contact thermal resistance is reduced to 0.08-0.1 ℃ / W by the cooperation of both, significantly reduce stator operating temperature, avoid insulation aging caused by local overheating, and heat dissipation structure and installation structure have no interference, realize efficient heat dissipation in compact space, adapt to the heat dissipation demand of small and medium-sized motor (3-10kW).

Description

Technical Field

[0001] This utility model relates to the field of stator coil assembly, specifically a stator coil assembly that is stably installed. Background Technology

[0002] The stator coil assembly is the core functional component of the motor stator. It is the "stationary core unit that realizes electromagnetic energy conversion" in the motor, and it directly determines the motor's power, efficiency, reliability, and installation stability. Its core function is to generate a stable magnetic field after current is applied, which interacts with the rotor to realize the conversion of electrical energy into mechanical energy. At the same time, through structural design, it ensures installation fixation, insulation protection, and heat dissipation efficiency.

[0003] The existing stable stator winding assembly has a problem because the stator core is installed on the inner wall of the motor housing. The heat generated by the copper loss (winding) and iron loss (core) during stator operation is difficult to dissipate quickly. This is because a high heat resistance path with "air as the main component" is formed between the stator and the housing, resulting in insufficient heat dissipation. This can easily lead to local overheating. If the temperature continues to rise, the insulation layer of the winding enameled wire will soften due to high temperature, eventually causing a chain reaction of problems from material aging to motor failure. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a stator coil assembly that can be installed stably, so as to solve the technical problem of insufficient heat dissipation of the stator coil assembly.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a stator coil assembly with stable installation, including a stator core, a core slot on the stator core, and a stator winding installed in the core slot, a thermal grease on the outer wall of the stator core, and a thermally conductive silicone pad on the side of the thermal grease away from the stator core, and a positioning strip installed on the outer wall of the stator core, with a screw hole inside the positioning strip.

[0006] By adopting the above technical solution, the stator core serves as the magnetic core carrier, made of stacked silicon steel sheets, providing a closed magnetic circuit to reduce iron loss. The core slots provide the installation space for the stator windings, with slot dimensions adapted to the winding specifications to ensure slot fill factor (50%-55% for round wire / 70%-75% for flat wire). At the same time, the core slots provide an assembly reference for the slot liner, ensuring the stability of the insulation structure. The screw holes provide an interface for bolt fastening, allowing the stator to be double-fixed by positioning strips and bolt locking, further enhancing installation stability.

[0007] Furthermore, the stator core and the positioning strip are integrally formed.

[0008] By adopting the above technical solutions, the structural strength is guaranteed through process constraints, avoiding problems such as vibration loosening and increased thermal resistance caused by split connections.

[0009] Further, the stator core and the positioning strip are made of silicon steel sheet material.

[0010] By adopting the above technical solution, the stator core made of silicon steel sheet material can ensure magnetic permeability and reduce core loss.

[0011] Further, the positioning strip is configured in a "convex" shape structure.

[0012] By adopting the above technical solution, automatic centering during assembly is facilitated, while the contact area with the groove of the motor housing is increased, so as to improve positioning accuracy and vibration resistance.

[0013] Further, there are 12 positioning strips, and a plurality of the positioning strips are distributed on the outer wall of the stator core in an annular array.

[0014] By adopting the above technical solution, the uniformly distributed positioning strips ensure force balance and improve the stability of the stator assembly.

[0015] Further, the thermal conductive grease is a metal-based thermal conductive grease, and the thickness of the thermal conductive grease is 0.05-0.1mm.

[0016] By adopting the above technical solution, the metal-based thermal conductive grease (thermal conductivity ≥5W / (m·K)) ensures thermal conduction efficiency, and the thickness of 0.05-0.1mm precisely fills microscopic gaps to avoid the increase of thermal resistance caused by residual air.

[0017] Further, the thickness of the thermal conductive silica gel pad is 0.8-1.2mm, and the thermal conductive silica gel pad (4) is selected as a silica gel pad with a hardness of 25 Shore A.

[0018] By adopting the above technical solution, the thermal conductive silica gel pad with a hardness of 25 Shore A can balance vibration buffering and thermal conduction efficiency, avoiding piercing due to excessive hardness or insufficient rebound due to excessive softness.

[0019] Further, a slot liner made of mica-based composite insulating material is arranged in the core slot, and the stator winding is in close contact with the slot liner.

[0020] By adopting the above technical solution, the mica-based material has a temperature resistance of ≥155°C and high insulation strength, and the slot liner is in close contact with the stator winding, which prevents short circuit between the stator winding and the stator core and improves the operation reliability of the motor.

[0021] In summary, the present utility model mainly has the following beneficial effects:

[0022] 1. This utility model uses metal-based thermal paste (0.05-0.1mm) to fill microscopic gaps and thermally conductive silicone pads (0.8-1.2mm) to compensate for macroscopic errors. The two work together to reduce the contact thermal resistance to 0.08-0.1℃ / W, significantly reducing the stator operating temperature, avoiding insulation aging caused by local overheating, and the heat dissipation structure does not interfere with the installation structure. It achieves efficient heat dissipation in a compact space and is suitable for the heat dissipation needs of small and medium-sized motors (3-10kW).

[0023] 2. This utility model achieves circumferential positioning by precisely matching 12 evenly distributed convex positioning strips with the grooves of the motor housing; the positioning strips and the stator core are integrally formed to avoid the risk of loosening of separate connections, and the screw holes are adapted to bolts to enable the installation and fixing of the stator core. This method forms a dual guarantee of "positioning and locking", which improves the stability of the stator coil assembly after installation and ensures that the motor does not shift during operation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the stator core structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the stator winding structure of this utility model;

[0027] Figure 4 This is a schematic diagram of the overall orthographic structure of this utility model;

[0028] Figure 5 This is a schematic diagram of the positioning strip structure of this utility model;

[0029] Figure 6 For the present utility model Figure 4 A magnified structural diagram of point A in the middle.

[0030] In the diagram: 1. Stator core; 2. Stator winding; 3. Thermal paste; 4. Thermal silicone pad; 5. Positioning strip; 6. Screw hole; 7. Core slot. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0032] The embodiments of this utility model will be described below based on its overall structure.

[0033] Example 1:

[0034] A stator wire assembly with stable installation, such as Figures 1-6 shown in the figure, comprises a stator core 1, wherein a core slot 7 is formed in the stator core 1, a stator winding 2 is arranged in the core slot 7, the outer wall of the stator core 1 is provided with a thermal grease 3, the side of the thermal grease 3 away from the stator core 1 is provided with a thermal conductive silica gel pad 4, and the outer wall of the stator core 1 is further provided with a positioning strip 5. The stator core 1 is a magnetically conductive core carrier, which is formed by stacking silicon steel sheets, and provides a closed magnetic circuit to reduce core loss. The core slot 7 is an installation space for the stator winding 2, and the slot size is adapted to the winding specification to ensure the slot fill factor (50%-55% for round wires / 70%-75% for flat wires). Meanwhile, the core slot 7 provides an assembly reference for the slot liner to ensure the stability of the insulating structure. The thickness of the thermal conductive silica gel pad 4 is 0.8-1.2mm, and the thermal conductive silica gel pad 4 is a silica gel pad with a hardness of 25 Shore A. The hardness of 25 Shore A enables the thermal conductive silica gel pad 4 to balance vibration buffering and thermal conductivity efficiency, avoiding penetration due to excessive hardness or insufficient rebound due to excessive softness.

[0035] referring to Figures 1-6 , a screw hole 6 is formed inside the positioning strip 5, and the screw hole 6 provides an interface for bolt tightening, so that the stator can be doubly fixed through the positioning of the positioning strip 5 and bolt locking, further enhancing the installation stability. The stator core 1 and the positioning strip 5 are integrally formed, and the structural strength is guaranteed through process limitation, so as to avoid problems such as vibration loosening and increased thermal resistance caused by split connection. The stator core 1 and the positioning strip 5 are made of silicon steel sheet materials. The stator core 1 made of silicon steel sheet materials can ensure magnetic conductivity and reduce core loss. The inner wall of the motor housing is provided with grooves adapted to the positioning strips 5, the number of the grooves is the same as the number of the positioning strips 5, and the grooves are further provided with bolt holes, so that bolts can be conveniently screwed into the screw holes 6 and the bolt holes to lock and fix the positioning strips 5. The positioning strip 5 is arranged in a "convex" shape, which facilitates automatic centering during assembly, and simultaneously increases the contact area with the groove of the motor housing, so as to improve the positioning accuracy and vibration resistance. Twelve positioning strips 5 are provided, and a plurality of positioning strips 5 are distributed on the outer wall of the stator core 1 in an annular array. The uniformly distributed positioning strips 5 ensure stress balance and improve the stability of the stator assembly.

[0036] Second embodiment:

[0037] On the basis of the first embodiment described above, in order to improve the service performance of the thermal grease 3, the following thermal grease 3 will be selected.

[0038] Specifically, the thermal grease 3 is a metal-based thermal grease, the thickness of the thermal grease 3 is 0.05-0.1mm, the metal-based thermal grease (thermal conductivity ≥5W / (m·K)) ensures thermal conduction efficiency, and the thickness of 0.05-0.1mm precisely fills microscopic gaps to avoid the increase of thermal resistance caused by residual air.

[0039] Third embodiment:

[0040] Based on the above embodiment 1, in order to prevent the stator core 1 from short-circuiting with the stator winding 2, the following structure will be set.

[0041] Specifically, the core slot 7 is equipped with a slot liner made of mica-based composite insulating material. The stator winding 2 is tightly fitted with the slot liner. The mica-based material has a temperature resistance of ≥155℃ and high insulation strength. The tight fit between the slot liner and the stator winding 2 prevents short circuit between the stator winding 2 and the stator core 1, thereby improving the reliability of motor operation.

[0042] The working principle of this utility model is as follows: First, in the assembly stage: the stator winding 2 is embedded into the iron core slot 7 with mica-based groove liner, and thermal conductive paste 3 is applied to the outer wall of the stator iron core 1 and thermal conductive silicone pad 4 is attached; the convex positioning strip 5 is aligned with the groove of the motor housing, and bolts are screwed in, and the bolts are screwed into the bolt hole 6 and the bolt hole, thereby completing the fixation of the stator iron core 1 and ensuring that the stator iron core 1 is coaxial with the rotor; the mica-based composite insulating groove liner in the iron core slot 7 is tightly attached to the slot wall and the stator winding 2, forming an electrical isolation barrier to prevent the stator winding 2 from directly contacting the stator iron core 1; at the same time, the temperature resistance and insulation strength of the groove liner are adapted to the motor operating conditions, avoiding insulation aging or damage caused by high temperature and vibration, eliminating short circuit faults, and ensuring long-term reliable operation of the motor;

[0043] The stator core 1 and the positioning strips 5 are integrally formed to ensure structural strength. During assembly, 12 convex positioning strips 5 are embedded in the corresponding grooves of the motor housing to achieve circumferential limiting and automatic centering. Bolts are screwed into the screw holes 6 on the positioning strips to rigidly fix the stator to the housing. The end cover is pressed to achieve axial positioning, forming a double fixation of "circumferential and axial", which avoids displacement and vibration during motor operation.

[0044] When the stator is running, the copper losses generated by the windings and the iron losses generated by the stator core 1 are converted into heat. The thermal paste 3 on the outer wall of the stator core 1 fills the micro gaps and quickly conducts the heat of the core to the thermally conductive silicone pad 4. The thermally conductive silicone pad 4 has a certain elasticity and fits tightly against the motor housing. At the same time, it compensates for assembly errors and further conducts the heat to the housing. Finally, it is dissipated into the environment through the housing heat dissipation structure (such as fins), realizing an efficient heat dissipation path of "stator core 1 → thermal paste 3 → thermally conductive silicone pad 4 → housing → external environment".

[0045] When a three-phase or single-phase current is applied to the stator winding 2, a rotating magnetic field is generated in the magnetic circuit of the stator core 1. This magnetic field interacts with the magnetic field of the rotor (rotating part of the motor) to generate electromagnetic torque, which drives the rotor to rotate and realizes the conversion of electrical energy into mechanical energy (motor scenario). In the generator scenario, the rotor cuts the stator magnetic field to generate induced current and realizes the conversion of mechanical energy into electrical energy.

[0046] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A stator coil assembly with stable installation, comprising a stator core (1), characterized in that: A stator core slot (7) is formed in the stator core (1), a stator winding (2) is mounted in the stator core slot (7), the outer wall of the stator core (1) is provided with a thermal conductive paste (3), the side of the thermal conductive paste (3) away from the stator core (1) is provided with a thermal conductive silicone pad (4), the outer wall of the stator core (1) is further mounted with a positioning strip (5), and a screw hole (6) is formed inside the positioning strip (5).

2. The stator coil assembly with stable installation according to claim 1, characterized in that: The stator core (1) and the positioning strip (5) are integrally formed.

3. The stator coil assembly with stable installation according to claim 1, characterized in that: The stator core (1) and the positioning strip (5) are made of silicon steel sheet material.

4. The stator coil assembly with stable installation according to claim 1, characterized in that: The positioning strip (5) is arranged in a "convex" shaped structure.

5. A stator coil assembly with stable installation according to claim 1, characterized in that: Twelve positioning strips (5) are provided, and the plurality of positioning strips (5) are distributed on the outer wall of the stator core (1) in an annular array.

6. A stator coil assembly with stable installation according to claim 1, characterized in that: The thermal conductive paste (3) is a metal-based thermal conductive paste, and the thickness of the thermal conductive paste (3) is 0.05-0.1mm.

7. A stator coil assembly with stable installation according to claim 1, characterized in that: The thickness of the thermal conductive silicone pad (4) is 0.8-1.2mm, and the thermal conductive silicone pad (4) is a silicone pad with a hardness of 25 Shore A.

8. A stator coil assembly with stable installation according to claim 1, characterized in that: A slot liner made of a mica-based composite insulating material is arranged in the stator core slot (7), and the stator winding (2) is in close contact with the slot liner.

Images