A stator core for a frameless torque motor and related automation equipment

Abstract

This utility model discloses a stator core for a frameless torque motor and an automated device thereof. The stator core includes a stator yoke and stator teeth. The stator yoke is annular, and the stator teeth include an annular ring and multiple tooth units extending radially outward from the annular ring. The stator teeth are fitted inside the stator yoke, and the stator yoke and stator teeth are coaxially arranged. The multiple tooth units are evenly distributed. The surfaces of the stator yoke and stator teeth are coated with a high-temperature resistant insulating film using polymer vacuum coating technology. Stator coils are arranged outside the tooth units. By using a high-temperature resistant insulating film to replace the insulating support in the stator core, the motor achieves significant improvements in cost, size, performance, and reliability.

Description

Technical Field

[0001] This utility model relates to the field of rotating motor technology, and in particular to a stator core of a frameless torque motor and an automation device thereof. Background Technology

[0002] A frameless torque motor refers to a motor that includes both the rotor and stator, but excludes the housing and shaft. Users can install the rotor and stator themselves according to the characteristics of their products. The absence of a housing and shaft in frameless torque motors provides more space for other equipment, and the hollow section facilitates wiring. They are widely used in aerospace, steering joints, medical robots, and other fields. The motor stator is one of the main components of the motor, primarily composed of a toothed core and a yoke core. The teeth of the toothed core form magnetic poles to guide magnetic flux, and the space between adjacent teeth houses the stator windings. The yoke core supports the teeth and conducts magnetic flux; its material and structure directly affect the motor's heat dissipation and mechanical strength. Furthermore, insulation is required between the stator and the winding coils.

[0003] Frameless torque motors have relatively high requirements for installation space. Existing frameless torque motors have insulating supports mounted on the winding coils of the toothed core stator. These supports are used for insulation between the winding coils and the stator core, resulting in high production costs, low space utilization, complex assembly, unstable fixing, and susceptibility to vibration. This leads to low motor efficiency, high failure rate, and unstable motor performance. Therefore, there is an urgent need for a stator core design with optimized structure and high stability to improve motor performance and reliability. Utility Model Content

[0004] In view of this, the present invention addresses the deficiencies of the existing technology, and its main purpose is to provide a stator core for a frameless torque motor and an automated device. The stator core is made by replacing the insulating support with a high-temperature resistant insulating film prepared in the stator yoke and stator teeth, which can significantly improve the motor in terms of cost, size, performance and reliability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A stator core for a frameless torque motor includes a stator yoke and a stator tooth section. The stator yoke is annular, and the stator tooth section includes an annular circular portion and a plurality of tooth units extending radially outward along the circular portion. The stator teeth are fitted inside the stator yoke and are coaxially arranged. The plurality of tooth units are evenly distributed. The surfaces of the stator yoke and the stator teeth are coated with a high-temperature resistant insulating film using polymer vacuum coating technology. A stator coil is disposed outside the tooth unit.

[0007] As a preferred embodiment, a first limiting portion is provided on the inner sidewall of the stator yoke, the first limiting portion extends along the axial direction of the stator yoke and passes through both ends of the stator yoke, and a second limiting portion corresponding to the first limiting portion is provided at the end of the tooth unit away from the annular portion.

[0008] As a preferred embodiment, the first limiting part is a limiting groove, and the second limiting part is a limiting protrusion; during assembly, the limiting protrusion is embedded in the limiting groove.

[0009] As a preferred embodiment, the toothed unit is square in shape, and the width of the groove of the limiting groove is the same as the width of the toothed unit.

[0010] As a preferred embodiment, the stator yoke and the stator teeth are formed by lamination and pressing of high-strength silicon steel sheets.

[0011] As a preferred embodiment, the outer surface of the stator yoke is provided with a plurality of mounting grooves, which extend along the axial direction of the stator yoke.

[0012] As a preferred embodiment, the high-temperature resistant insulating film is made of polyimide.

[0013] As a preferred embodiment, the thickness of the high-temperature resistant insulating film is 0.05mm-0.5mm.

[0014] This utility model also provides an automated device, including a frameless torque motor, wherein the frameless torque motor includes the stator core of the frameless torque motor described in any of the above claims.

[0015] Compared with the prior art, this utility model has obvious advantages and beneficial effects. As can be seen from the above technical solution, it mainly has the following beneficial effects:

[0016] 1. Significantly reduced production costs: Traditional insulating brackets typically require injection-molded parts or laminated insulating materials. Their customized production incurs costs for mold development and material procurement. The assembly of insulating brackets requires precise alignment by manual labor or automated equipment, making the process complex. This utility model eliminates the need for insulating brackets by preparing high-temperature resistant insulating films on the outer surfaces of the stator yoke and stator teeth. This results in lower development, procurement, and material costs, and eliminates the need for individual customization for different stator tooth shapes. It is particularly suitable for mass production scenarios, reducing assembly time and equipment investment, and lowering the total production cost.

[0017] 2. Optimize motor structure and improve space utilization: Traditional insulation brackets need to occupy a certain gap between the stator teeth and the coils, while the thickness of the high-temperature resistant insulation film can be precisely controlled and can completely fit the irregular surface of the stator teeth, thereby reducing the redundant space between the stator and the coils. This means that in a motor with the same outer diameter, more coil turns or a larger wire diameter can be accommodated, increasing the slot fill factor, thereby improving the motor power density and space utilization, or reducing the overall size of the motor under the same power, making it suitable for scenarios with strict space requirements.

[0018] 3. Improved Motor Performance and Enhanced Reliability: The insulation effect of the insulating bracket depends on the voltage resistance and integrity of the material itself. Minor cracks, burrs, or wear during assembly can lead to localized breakdown. High-quality high-temperature resistant insulating film forms a continuous, seamless insulating layer that evenly covers the edges and gaps of the stator teeth. It also boasts superior voltage resistance and aging resistance, making it particularly suitable for high-voltage, high-humidity operating conditions, resulting in more stable insulation performance. Furthermore, the thin, tightly bonded high-temperature resistant insulating film coating shortens the heat transfer path between the coil and the stator core, accelerating heat dissipation and preventing efficiency drops or shortened lifespan due to overheating. This enhances heat dissipation efficiency and improves motor reliability.

[0019] 4. Improved Motor Reliability and Lifespan: During motor operation, vibrations in the coils and stator teeth can cause friction and collisions between the insulation support and these components, potentially leading to support wear or coil insulation damage over time. High-temperature resistant insulation films, however, are flexibly bonded to the stator teeth and coils, buffering vibration and impact, reducing vibration and noise, lowering the risk of mechanical wear, and extending motor lifespan. High-temperature resistant insulation films can withstand higher temperatures and stronger chemical corrosion, while traditional insulation supports are prone to aging at high temperatures and embrittlement at low temperatures. Therefore, motors with high-temperature resistant insulation films are more suitable for extreme environments, adapting to harsher operating conditions and improving motor operational reliability.

[0020] 5. Enhanced design flexibility: The shape of traditional insulation brackets must strictly match the stator tooth structure, resulting in poor compatibility with irregular stator tooth designs; while high-temperature resistant insulation films can completely adhere to the surface of stator teeth of any shape without changing the manufacturing process, facilitating customized motor design.

[0021] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the assembly structure of the stator core according to an embodiment of the present invention.

[0023] Figure 2 This is an exploded structural diagram of the stator core according to an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100. Stator yoke; 110. First limiting part; 120. Mounting groove;

[0026] 200, Stator teeth; 210, Annular section; 220, Tooth unit; 221, Second limiting section;

[0027] 300. Stator coil. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0029] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0030] Please see Figures 1 to 2 This invention provides a frameless torque motor stator core, comprising a stator yoke 100 and stator teeth 200. The stator yoke 100 is annular, and the stator teeth 200 includes an annular ring 210 and multiple tooth units 220 extending radially outward from the ring 210. The tooth units 220 are evenly distributed, and the stator teeth 200 are fitted inside the stator yoke 100, with the stator yoke 100 and stator teeth 200 coaxially arranged. The multiple tooth units 220 are evenly distributed, and the surfaces of the stator yoke 100 and stator teeth 200 are coated with a high-temperature resistant insulating film (not shown) using polymer vacuum coating technology. A stator coil 300 is disposed outside the tooth units 220. The stator coil 300 can be pre-wound and then embedded into the tooth units 220, or it can be directly wound and formed on the tooth units 220. The high-temperature resistant insulating film layer effectively improves electrical insulation performance, enhances operational stability, and extends service life. The stator coil 300 is made of a highly conductive material to ensure efficient energy conversion and meet the requirements of high-precision control. Polymer vacuum coating technology is existing technology and will not be elaborated upon here.

[0031] In this embodiment, a first limiting part 110 is provided on the inner sidewall of the stator yoke 100. The first limiting part 110 extends along the axial direction of the stator yoke 100 and passes through both ends of the stator yoke 100. A second limiting part 221 corresponding to the first limiting part 110 is provided at the end of the tooth unit 220 away from the annular part 210. This ensures that the stator tooth 200 is stably fixed in the stator yoke 100 and prevents the stator tooth 200 from rotating.

[0032] Preferably, the first limiting part 110 is a limiting groove, and the second limiting part 221 is a limiting protrusion; during assembly, the limiting protrusion is embedded into the limiting groove by an interference fit. The tight fit between the limiting protrusion and the limiting groove ensures that the stator teeth 200 are stably fixed within the yoke, preventing displacement due to vibration or high temperature, and further improving the stability and safety of motor operation. In other embodiments, the first limiting part 110 is a limiting protrusion, and the second limiting part 221 is a limiting groove, which can also achieve the same technical effect.

[0033] Preferably, the toothed unit 220 is square-shaped, and the width of the groove of the limiting groove is the same as the width of the toothed unit 220. The groove depth of the limiting groove is precisely matched with the height of the limiting protrusion to ensure a firm assembly, improve assembly accuracy and magnetic flux, reduce assembly errors, optimize the overall structure of the motor, enhance vibration resistance, extend the service life of the equipment, and meet the requirements of high-load operation.

[0034] Preferably, the stator yoke 100 and stator tooth 200 are formed by stamping and pressing high-strength silicon steel sheets, which are then riveted or self-adhesive to form a single unit. High-magnetic-induction, low-iron-loss cold-rolled silicon steel sheets, such as 35W250 or 50W350, with a thickness of 0.2mm-0.3mm, are used. These sheets are processed into the designed number and shape of stator slots using precision stamping dies or laser cutting machines, and then stacked and formed.

[0035] Preferably, the outer surface of the stator yoke 100 is provided with a plurality of mounting grooves 120, which extend along the axial direction of the stator yoke 100. The mounting grooves 120 are used to fix the stator yoke 100 to external parts, preventing the stator yoke 100 from rotating when the motor is working, improving the overall structural rigidity and ease of installation, and ensuring stable operation of the motor under various working conditions.

[0036] Preferably, the high-temperature resistant insulating film is made of polyimide to adapt to high-load working environments and reduce the failure rate. Polyimide film (PI) is a material that can simultaneously meet the requirements of withstanding 1500V high voltage, 100℃ high temperature, and wear resistance at a thickness of 0.5mm. It has sufficient performance margin and is suitable for the high-voltage, temperature rise, and wear-resistant working environment of motor stators. Moreover, the vacuum coating process can stably prepare a uniform and dense film layer, ensuring long-term insulation reliability.

[0037] Preferably, the thickness of the high-temperature resistant insulating film is 0.05mm-0.5mm, more preferably 0.3mm, to avoid scratching the high-temperature resistant insulating film during the winding or embedding process, which could lead to leakage.

[0038] This utility model also provides an automated device, including a frameless torque motor, wherein the frameless torque motor includes the stator core of any of the frameless torque motors described above.

[0039] This invention replaces the insulating support with a high-temperature resistant insulating film prepared in the stator yoke and stator teeth, which significantly improves the motor in terms of cost, size, performance, reliability and flexibility. It is especially suitable for scenarios that require miniaturization, high power density and low cost. It is an important trend in the development of motor technology towards "high efficiency, compactness and economy" and has great market prospects.

[0040] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stator core of a frameless torque motor, comprising a stator yoke portion (100) and a stator tooth portion (200), characterized in that, The stator yoke (100) is annular, and the stator tooth (200) includes an annular portion (210) and a plurality of tooth units (220) extending radially outward along the annular portion (210). The stator tooth (200) is fitted inside the stator yoke (100), and the stator yoke (100) and the stator tooth (200) are coaxially arranged. The plurality of tooth units (220) are evenly distributed. The surfaces of the stator yoke (100) and the stator tooth (200) are prepared with a high-temperature resistant insulating film. A stator coil (300) is arranged outside the tooth unit (220).

2. The stator core of the frameless torque motor according to claim 1, characterized by The inner wall of the stator yoke (100) is provided with a first limiting part (110), which extends along the axial direction of the stator yoke (100) and passes through both ends of the stator yoke (100). The tooth unit (220) is provided with a second limiting part (221) corresponding to the first limiting part (110) at one end away from the annular part (210).

3. The stator core of a frameless torque motor according to claim 2, characterized in that, The first limiting part (110) is a limiting groove, and the second limiting part (221) is a limiting protrusion; during assembly, the limiting protrusion is embedded in the limiting groove.

4. The stator core of the frameless torque motor according to claim 3, characterized by The toothed unit (220) is square in shape, and the width of the groove of the limiting groove is the same as the width of the toothed unit (220).

5. The stator core of the frameless torque motor according to claim 1, characterized by The stator yoke (100) and the stator tooth (200) are formed by stamping and pressing high-strength silicon steel sheets.

6. The stator core of a frameless torque motor of claim 1, wherein The outer surface of the stator yoke (100) is provided with a plurality of mounting grooves (120), which extend along the axial direction of the stator yoke (100).

7. The stator core of a frameless torque motor of claim 1, wherein The high-temperature resistant insulating film is made of polyimide.

8. The stator core of a frameless torque motor of claim 1, wherein The thickness of the high-temperature resistant insulating film is 0.05mm to 0.5mm.

9. An automation device comprising a frameless torque motor, characterized in that The frameless torque motor includes the stator core of the frameless torque motor according to any one of claims 1 to 8.

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