An end cover structure, a permanent magnet servo motor and an industrial device

Abstract

The utility model provides a kind of end cover structure, permanent magnet servo motor and industrial equipment, belong to servo motor technical field.The end cover structure of the utility model includes end cover body, the center of end cover body is equipped with first shaft hole;First annular flange is formed with the first end surface of end cover body around first shaft hole, the inner wall surface of first annular flange forms the first bearing chamber for accommodating first bearing;First flow channel is from the outer wall surface of first annular flange to the inner wall surface of first annular flange;The stator of servo motor is formed with accommodating cavity corresponding between the shell of servo motor and first annular flange, accommodating cavity is communicated with first bearing chamber by first flow channel.The utility model provides the scheme, its structure design is reasonable, can avoid servo motor when high temperature operation, between stator and shell, between the outside surface of first bearing and first bearing chamber loosening skidding, so that servo motor has the ability of high power density.

Description

Technical Field

[0001] This utility model belongs to the field of servo motor technology, specifically relating to an end cap structure, a permanent magnet servo motor, and industrial equipment. Background Technology

[0002] Servo motors are widely used in the field of industrial robots, serving as their power source. With the development of robot technology, the power density requirements for servo motors are becoming increasingly stringent, inevitably leading to their operation in high-temperature environments.

[0003] To facilitate heat dissipation, servo motors typically utilize aluminum alloy housings and front covers with high thermal conductivity as their support structure. Since the coefficient of thermal expansion of aluminum alloy is much greater than that of steel, the expansion rate of the housing after heating is significantly greater than that of the steel stator core and front bearing under high-temperature conditions. This means the deformation of the housing is significantly greater than that of the stator core and front bearing, and the deformation of the aluminum alloy bearing housing is significantly greater than that of the steel bearing outer ring. This results in a smaller interference fit between the stator core and housing, and between the bearing outer ring and bearing housing, compared to the cold state, leading to a transition fit or even a clearance fit. This, in turn, causes slippage in the stator core and bearing outer ring, severely impacting the servo motor.

[0004] To prevent stator core slippage, some servo motors use epoxy resin potting, which "glues" the stator core to the inside of the housing. This method provides good fixation. To prevent bearing outer ring slippage, a steel ring is typically placed in the front bearing housing. Molten aluminum is used during the casting of the front cover to bond and fix the steel ring to it, thus preventing slippage due to the difference in expansion coefficients between the bearing outer ring and the bearing housing. However, since the expansion coefficients of the steel ring and the front cover are always different, there is still a risk of detachment at higher temperatures. Furthermore, because the internal cavity of a servo motor is well-sealed, the internal air pressure increases with temperature. Since the oil seal on the front cover relies on friction to restrict movement, under sufficiently high pressure, the oil seal may experience unpredictable axial displacement, leading to seal failure. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the aforementioned technologies by proposing an end cap structure, a permanent magnet servo motor, and industrial equipment, aiming to solve the problem of slippage between the stator and the housing, and between the first bearing and the first bearing chamber, when existing servo motors operate at high temperatures.

[0006] This utility model provides an end cap structure, including: The end cap body has a first shaft hole in the center for the servo motor shaft to pass through; The end cover body has a first end face, a first annular flange surrounding the first shaft hole is formed on the first end face, and the inner wall surface of the first annular flange forms a first bearing chamber for accommodating a first bearing; The first annular flange is provided with a first flow passage, which penetrates from the outer wall surface of the first annular flange to the inner wall surface of the first annular flange; The first end face is configured to face the servo motor, so that a receiving cavity corresponding to the stator of the servo motor is formed between the housing of the servo motor and the first annular flange, and the receiving cavity communicates with the first bearing chamber through the first flow passage.

[0007] Further, the first flow passage penetrates from the outer wall surface of the first annular flange to the inner wall surface of the first annular flange along the radial direction of the first annular flange.

[0008] Further, the number of the first flow passages is multiple, and the plurality of first flow passages are uniformly distributed along the circumferential direction of the first annular flange.

[0009] Further, the end cover body further has a second end face disposed opposite to the first end face, a second annular flange surrounding the first shaft hole is formed on the second end face, and the inner wall surface of the second annular flange forms an oil seal chamber for accommodating an oil seal; The end cover structure further includes a second flow passage, which extends from the first end face to the inner wall surface of the second annular flange, so that the receiving cavity communicates with the oil seal chamber through the second flow passage.

[0010] Further, the second flow passage includes a first communication hole and a second communication hole, the first communication hole extends from the first end face along the axial direction of the rotating shaft, and the second communication hole extends from the inner wall surface of the second annular flange along the radial direction of the first annular flange and communicates with the first communication hole.

[0011] Further, the first flow passage further includes an arc-shaped transition hole, which communicates between the first communication hole and the second communication hole.

[0012] Further, the aperture of the first communication hole and the second communication hole is d, the curvature radius of the arc-shaped transition hole is R, and d and R satisfy the relationship: R≧1.5d.

[0013] Further, a chamfer / groove is provided at the opening of the first flow passage located on the inner wall surface of the first bearing chamber; and / or A chamfer / groove is provided at the opening of the second flow passage located on the inner wall surface of the oil seal chamber.

[0014] Further, the number of the second flow passages is configured as follows: When the axial thickness L of the oil seal satisfies L≦10mm, 3-4 second flow passages are provided; When the axial thickness L of the oil seal satisfies 10mm<L≦10mm, 5-6 second flow passages are provided; When the axial thickness L of the oil seal is greater than 20 mm, 7-8 second flow channels are provided.

[0015] Furthermore, a first positioning structure is provided on the first end face of the end cover body, and a second positioning structure matching the first positioning structure is provided on the housing. The first positioning structure and the second positioning structure are engaged with each other to position the end cover structure on the housing.

[0016] Accordingly, this utility model also provides a permanent magnet servo motor, comprising: chassis; The stator, rotor, and shaft are located inside the housing. The stator surrounds the rotor, and the shaft is fixed inside the rotor. According to the embodiment of the first aspect, the end cover structure is provided with a first end face fastened to one end of the housing, and the first annular flange of the end cover structure protrudes toward the rotor, forming a receiving cavity corresponding to the stator between the first annular flange and the housing. The first bearing is located in the first bearing chamber of the end cover structure; The permanent magnet servo motor also includes potting compound, which fills the first flow channel of the receiving cavity and end cap structure, and the outer side of the first bearing is fixed by the potting compound.

[0017] Furthermore, the permanent magnet servo motor also includes an oil seal, which is located in the oil seal chamber of the end cover structure; The potting compound also fills the second flow channel of the end cap structure, and the outer surface of the oil seal is fixed by the potting compound.

[0018] Furthermore, potting compounds include epoxy resin adhesives; The viscosity of epoxy resin adhesive below 25℃ is less than or equal to 1000 mPa·s; The shear strength of the cured epoxy resin is greater than or equal to 10 MPa, and the compressive strength is greater than or equal to 50 MPa.

[0019] Furthermore, the permanent magnet servo motor also includes a rear end cover, a second bearing, and an encoder; The rear end cover is fastened to the other end of the housing, and a second shaft hole for the rotating shaft to pass through is opened in the center of the rear end cover; A second bearing chamber for accommodating the second bearing is formed on the end face of the rear cover facing the servo motor, and the second bearing is located in the second bearing chamber; The encoder is connected to the rotating shaft and located outside the housing. An encoder cover is fitted over the encoder.

[0020] Accordingly, the present invention also provides an industrial device, including a permanent magnet servo motor provided according to an embodiment of the second aspect.

[0021] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: (1) The end cap structure provided by this utility model opens a first flow channel on the first annular flange so that when the stator of the servo motor is potted, the potting glue can fix the first bearing and the first bearing chamber at the same time, thereby preventing the stator and the housing, and the outer side of the first bearing and the first bearing chamber from loosening and slipping when the servo motor is running at high temperature, so that the servo motor has the ability of high power density.

[0022] (2) The end cap structure provided by this utility model also includes a second flow channel extending from the first end face to the inner wall surface of the second annular flange. The second flow channel can form a channel for the potting adhesive to flow into and solidify in the gap between the outer side of the oil seal and the inner wall surface of the second annular flange during stator potting, thereby realizing the potting between the oil seal and the oil seal chamber and avoiding loosening and slippage between the outer side of the oil seal and the oil seal chamber. Attached Figure Description

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a cross-sectional structural diagram of an end cap structure and a permanent magnet servo motor according to the present invention. Figure 2 This is a schematic diagram of an end cap structure according to the present invention; Figure 3 This is a cross-sectional structural diagram of an end cap structure according to the present invention; Figure 4 This utility model Figure 1 Enlarged view of part A; Figure 5 This is a schematic diagram of the stator potting of a permanent magnet servo motor according to the present invention.

[0025] In the diagram: 100 End cap body, 110 First shaft hole, 120 First annular flange, 121 First flow channel, 130 Second annular flange, 141 First connecting hole, 142 Second connecting hole, 143 Arc-shaped transition hole, 200 Rotary shaft, 300 First bearing, 400 Housing, 410 Potting compound, 420 Potting fixture, 430 Nozzle, 500 Stator, 600 Oil seal, 700 Rotor, 800 Rear end cover, 810 Second bearing, 900 Encoder, 910 Encoder cover. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0027] Throughout the specification and claims, the following terms will have at least the meaning explicitly associated herein, unless the context otherwise requires. The meanings defined below are not intended to limit the terms, but are merely illustrative examples.

[0028] In the description of this utility model, the phrase "in one embodiment" does not necessarily refer to the same embodiment, although it may refer to the same embodiment. Similarly, the phrase "in some embodiments," as used herein, does not necessarily refer to the same embodiment when used multiple times, although it may refer to the same embodiment. As used herein, the term "or" is an inclusive "or" operator and is equivalent to the term "and / or," unless the context clearly specifies otherwise. The term "based on" is not exclusive and allows for reliance on additional factors not described, unless the context clearly specifies otherwise. The word "exemplary" herein means "serving as an example, instance, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as superior to or better than other embodiments. The scope of this utility model is limited only by the scope of the appended claims, and any examples set forth in this specification are not intended to be limiting, but merely to illustrate some of the many possible embodiments of the claimed utility model. The various embodiments provided by this utility model should not be construed as limiting the scope of protection of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] like Figures 1 to 3 As shown, this embodiment of the present invention provides an end cap structure, including an end cap body 100. The end cap body 100 has a first shaft hole 110 at its center for a servo motor shaft 200 to pass through. The end cap body 100 has a first end face, on which a first annular flange 120 is formed surrounding the first shaft hole 110. The inner wall of the first annular flange 120 forms a first bearing chamber for accommodating a first bearing 300. The first annular flange 120 is provided with a first flow channel 121, which extends from the outer wall of the first annular flange 120 to its inner wall, thereby forming a channel for potting compound 410 to flow into the gap between the outer surface of the first bearing 300 and the inner wall of the first annular flange 120. The first end face faces the servo motor, forming a receiving cavity between the servo motor housing 400 and the first annular flange 120, corresponding to the stator 500 of the servo motor, for accommodating the potting compound 410 required for potting the stator 500. The receiving cavity communicates with the first bearing chamber through the first flow channel 121, allowing the potting compound 410 to enter the first bearing chamber through the first flow channel 121. Thus, during stator 500 potting, the potting compound 410 can flow into the first bearing chamber through the first flow channel 121 and solidify on the outer surface of the first bearing 300, thereby fixing the first bearing 300 inside the first bearing chamber.

[0034] The end cap structure provided by this utility model has a first flow channel 121 on the first annular flange 120 so that when the stator 500 of the servo motor is potted, the potting glue 410 can simultaneously fix the first bearing 300 and the first bearing chamber, thereby preventing the stator 500 and the housing 400 from loosening and slipping, and the outer side of the first bearing 300 and the first bearing chamber from slipping when the servo motor is running at high temperature, so that the servo motor has the ability of high power density.

[0035] The inner wall surface of the first annular flange 120 can form part of the first bearing chamber or a complete first bearing chamber in the axial direction.

[0036] Preferably, in combination with the above schemes, such as Figures 1 to 3 As shown in one embodiment of the present invention, the first flow channel 121 extends radially from the outer wall surface of the first annular flange 120 to the inner wall surface of the first annular flange 120. This arrangement minimizes the path of the first flow channel 121, facilitating the entry of the potting compound 410 into the first bearing chamber. In other embodiments, the first flow channel 121 can be arranged in other directions, as long as the outer wall surface of the first annular flange 120 is connected to the inner wall surface of the first annular flange 120.

[0037] Preferably, in combination with the above schemes, such as Figures 2 to 3 As shown, in one embodiment of this utility model, there are multiple first flow channels 121. The multiple first flow channels 121 are evenly distributed along the circumferential direction of the first annular flange 120, so that when the potting compound 410 enters the first bearing chamber through the first flow channel 121, it can be evenly distributed in the gap between the outer surface of the first bearing 300 and the inner wall surface of the first annular flange 120, thereby ensuring the potting effect.

[0038] Preferably, in combination with the above schemes, such as Figures 1 to 3 As shown in the figure, in one embodiment of the present invention, the end cap body 100 also has a second end face, which is disposed opposite to the first end face. A second annular flange 130 surrounding the first shaft hole 110 is formed on the second end face, and the inner wall surface of the second annular flange 130 forms an oil seal chamber for accommodating the oil seal 600. The end cap structure also includes a second flow channel, which extends from the first end face to the inner wall surface of the second annular flange 130. Thus, the second flow channel can form a channel for the potting compound 410 to flow into and solidify in the gap between the outer surface of the oil seal 600 and the inner wall surface of the second annular flange 130 during the potting of the stator 500, thereby realizing the potting between the oil seal 600 and the oil seal chamber and preventing the outer surface of the oil seal 600 from loosening and slipping between the oil seal chamber and the oil seal chamber. The receiving cavity is connected to the oil seal chamber through the second flow channel, so that the potting compound 410 can enter the oil seal chamber through the second flow channel.

[0039] Specifically, when the aluminum alloy housing 400 and end cover body 100 expand due to heat, the outer surface of the first bearing 300 and the outer surface of the oil seal 600 are bonded together by the potting compound 410, preventing slippage and displacement. Therefore, the end cover structure provided by this embodiment of the present invention reduces the steel ring structure compared to the prior art, thereby reducing processing difficulty and production cost.

[0040] The inner wall surface of the second annular flange 130 can form part of the oil seal chamber or a complete oil seal chamber in the axial direction.

[0041] Preferably, in combination with the above schemes, such as Figures 1 to 3 As shown in the figure, in one embodiment of the present invention, the second flow channel includes a first connecting hole 141 and a second connecting hole 142. The first connecting hole 141 extends from the first end face along the axial direction of the rotating shaft 200, and the second connecting hole 142 extends from the inner wall surface of the second annular flange 130 along the radial direction of the first annular flange 120 and communicates with the first connecting hole 141. The first connecting hole 141 and the second connecting hole 142 form a right-angle turn. When potting the stator 500 of the servo motor, the potting compound 410 in the receiving cavity can enter the oil seal chamber sequentially through the first connecting hole 141 and the second connecting hole 142.

[0042] Preferably, in combination with the above schemes, such as Figure 1 and Figure 4 As shown in the figure, in one embodiment of the present invention, the first flow channel 121 further includes an arc-shaped transition hole 143, which connects the first connecting hole 141 and the second connecting hole 142, and is used to guide the potting compound 410 from the first connecting hole 141 to the second connecting hole 142. Preferably, the arc-shaped transition hole 143 adopts a larger arc angle as much as possible, which can help reduce the flow resistance of the potting compound 410, avoid the potting compound 410 from stagnating, and ensure dense filling.

[0043] Preferably, in combination with the above schemes, such as Figure 4 As shown in the figure, as an embodiment of the present invention, the diameter of the first connecting hole 141 and the second connecting hole 142 is d, and the radius of curvature of the arc-shaped transition hole 143 is R. When d and R satisfy the relationship R≧1.5d, it can ensure that the potting compound 410 flows smoothly in the second channel, avoid the generation of eddies or bubbles, and ensure dense filling.

[0044] Preferably, in combination with the above solutions, as an embodiment of the present utility model, the opening of the first flow passage 121 located on the inner wall surface of the first bearing chamber is provided with a chamfer or a groove, which can facilitate the initial diffusion of the potting adhesive 410 in the first flow passage 121 and ensure the uniform distribution of the potting adhesive 410. Alternatively, the opening of the second flow passage located on the inner wall surface of the oil seal chamber is provided with a chamfer or a groove, which can facilitate the initial diffusion of the potting adhesive 410 in the second flow passage and ensure the uniform distribution of the potting adhesive 410. In addition, the contact area between the potting adhesive 410 and the first bearing 300 or the oil seal 600 can also be increased, so as to improve the bonding reliability.

[0045] It can be understood that both the opening of the first flow passage 121 located on the inner wall surface of the first bearing chamber and the opening of the second flow passage located on the inner wall surface of the oil seal chamber may be provided with a chamfer or a groove at the same time.

[0046] Preferably, in combination with the above solutions, the number of the second flow passages is configured based on ensuring that the potting adhesive 410 can fully penetrate and cure, and form a complete and uniform cured sealing layer. The number of the second flow passages is generally positively correlated with the thickness of the oil seal chamber, which can realize effective fixation of the oil seal 600.

[0047] Preferably, when the axial thickness L of the oil seal 600 is ≤ 10mm, 3-4 second flow passages are provided; when the axial thickness L of the oil seal 600 satisfies 10mm < L ≤ 20mm, 5-6 second flow passages are provided; when the axial thickness L of the oil seal 600 is > 20mm, 7-8 second flow passages are provided.

[0048] Similarly, the number configuration of the first flow passages 121 follows the same rule: when the axial thickness L of the first bearing 300 is ≤ 10mm, 3-4 first flow passages are provided; when the axial thickness L of the first bearing 300 satisfies 10mm < L ≤ 20mm, 5-6 first flow passages are provided; when the axial thickness L of the first bearing 300 is > 20mm, 7-8 first flow passages are provided.

[0049] Preferably, in combination with the above solutions, as an embodiment of the present utility model, a first positioning structure is disposed on the first end face of the end cover body 100, and a second positioning structure matching the first positioning structure is disposed on the housing 400. The first positioning structure and the second positioning structure are mutually clamped to position the end cover structure on the housing 400.

[0050] Specifically, in some possible embodiments, the positioning structure includes a positioning boss protruding from the first end face / a positioning groove recessed in the first end face, and the housing 400 is provided with a positioning groove / a positioning boss matching the positioning boss / the positioning groove. The positioning boss is clamped in the positioning groove, so as to realize rapid concentric positioning between the end cover structure and the housing 400.

[0051] Accordingly, in conjunction with the above schemes, such as Figure 1 As shown, this utility model also provides a permanent magnet servo motor, including a housing 400, a stator 500, a rotor 700, a shaft 200, an end cover structure according to the embodiment of the first aspect, and a first bearing 300. The stator 500 and the rotor 700 are located inside the housing 400, with the stator 500 surrounding the rotor 700, and the shaft 200 fixed inside the rotor 700. The first end face of the end cover structure is fastened to one end of the housing 400, and the first annular flange 120 of the end cover structure protrudes towards the rotor 700, forming a receiving cavity corresponding to the stator 500 between the first annular flange 120 and the housing 400 for accommodating potting compound 410 required for potting the stator 500. The first bearing 300 is located in the first bearing chamber of the end cover structure. The permanent magnet servo motor also includes potting compound 410, which fills the first flow channel 121 of the receiving cavity and end cap structure. The outer side of the first bearing 300 is fixed by the potting compound 410, thereby achieving potting between the stator 500 and the housing, and between the first bearing 300 and the first bearing chamber. This prevents the outer side of the stator 500 from slipping and detaching from the housing and between the outer side of the first bearing 300 and the first bearing chamber when the servo motor is running at high temperatures, thus enabling the servo motor to have high power density capabilities.

[0052] Preferably, in combination with the above schemes, such as Figure 1 As shown in the figure, as an embodiment of the present invention, the permanent magnet servo motor also includes an oil seal 600, which is located in the oil seal chamber of the end cap structure. The potting compound 410 also fills the second flow channel of the end cap structure, and the outer surface of the oil seal 600 is fixed by the potting compound 410, thereby realizing the potting between the oil seal 600 and the oil seal chamber, and preventing the outer surface of the oil seal 600 from slipping off from the oil seal chamber when the servo motor is running at high temperature.

[0053] Preferably, in conjunction with the above scheme, as an embodiment of this utility model, the potting compound 410 includes epoxy resin. The viscosity of the epoxy resin below 25°C is less than or equal to 1000 mPa·s. Using a low-viscosity epoxy resin facilitates the filling of small pores, allowing the epoxy resin to fully fill the first flow channel 121 and the second flow channel. The shear strength of the cured epoxy resin is greater than or equal to 10 MPa, and the compressive strength is greater than or equal to 50 MPa, which can meet the shear strength and compressive strength requirements of the permanent magnet servo motor during operation.

[0054] In some possible embodiments, the method for potting the permanent magnet servo motor provided by this utility model includes the following steps: S1: Pre-assembly: Install the oil seal 600, the first bearing 300, the stator 500 and the end cover structure into the housing 400 in sequence, and insert the potting fixture 420 into the inner cavity of the stator 500 to form a receiving cavity.

[0055] S2: One-time potting: Using a nozzle 430, potting compound 410 is injected from the potting port formed on the housing 400 to fill the gap between the stator 500 and the housing 400, and fills the gap between the first bearing 300 and the first bearing chamber through the first flow channel 121, and fills the gap between the oil seal 600 and the oil seal chamber through the second flow channel.

[0056] S3: Curing: Keep it still to allow the potting compound 410 on the outer surfaces of the stator 500, oil seal 600 and the first bearing 300 to fully cure.

[0057] S4: Post-processing: Remove potting fixture 420 and complete the assembly of the permanent magnet servo motor.

[0058] When potting permanent magnet servo motors, either fast-drying or slow-drying epoxy resin adhesives can be selected based on installation requirements. Fast-drying epoxy resin adhesives have a curing time of 10-30 minutes, suitable for assembly line operations; slow-drying epoxy resin adhesives have a curing time of 1-2 hours, facilitating adjustments to the end cap structure during potting. The potted permanent magnet servo motor achieves a sealing rating of IP67 or higher.

[0059] Preferably, in combination with the above schemes, such as Figure 1 As shown, in one embodiment of this utility model, the permanent magnet servo motor further includes a rear end cover 800, a second bearing 810, and an encoder 900. The rear end cover 800 is fastened to the other end of the housing 400 to close the housing 400. A second shaft hole 820 for the rotating shaft 200 to pass through is opened in the center of the rear end cover 800. A second bearing chamber for accommodating the second bearing 810 is formed on the end face of the rear end cover 800 facing the servo motor. The second bearing 810 is located in the second bearing chamber. The rotating shaft 200 is sequentially passed through the oil seal 600, the first bearing 300, the rotor 700, the second bearing 810, and the encoder 900. The encoder 900 is connected to the rotating shaft 200 and is located outside the housing 400. When a drive current is applied to the stator 500, it can drive the rotor 700, the rotating shaft 200, and the code disk of the encoder 900 to rotate. The encoder 900 is covered with an encoder cover 910, which is connected to the rear cover 800. This allows the housing 400, end cover structure, oil seal 600, rear cover 800 and encoder cover 910 to form a sealed structure, thereby preventing external liquids and dust from entering the permanent magnet servo motor.

[0060] Accordingly, in conjunction with the above solutions, this utility model also provides an industrial device, including a permanent magnet servo motor according to the embodiment of the second aspect. When the permanent magnet servo motor operates at high temperatures, it can prevent slippage and detachment between the servo motor stator 500 and the housing 400, and between the outer surface of the bearing and the bearing chamber.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An end cap structure, characterized in that, include: The end cap body (100) has a first shaft hole (110) at its center for the servo motor shaft (200) to pass through. The end cap body (100) has a first end face, on which a first annular flange (120) is formed around the first shaft hole (110), and the inner wall surface of the first annular flange (120) forms a first bearing chamber for accommodating the first bearing (300). The first annular flange (120) is provided with a first flow channel (121), which extends from the outer wall surface of the first annular flange (120) to the inner wall surface of the first annular flange (120). The first end face is used to face the servo motor, such that a receiving cavity corresponding to the stator (500) of the servo motor is formed between the housing (400) of the servo motor and the first annular flange (120), and the receiving cavity is connected to the first bearing chamber through the first flow channel (121).

2. The end cap structure according to claim 1, characterized in that, The first flow channel (121) extends from the outer wall surface of the first annular flange (120) to the inner wall surface of the first annular flange (120) along the radial direction of the first annular flange (120).

3. The end cap structure according to claim 1, characterized in that, The number of the first flow channels (121) is multiple, and the multiple first flow channels (121) are evenly distributed along the circumferential direction of the first annular flange (120).

4. The end cap structure according to any one of claims 1-3, characterized in that, The end cap body (100) also has a second end face, which is disposed opposite to the first end face. A second annular flange (130) surrounding the first shaft hole (110) is formed on the second end face. The inner wall surface of the second annular flange (130) forms an oil seal chamber for accommodating the oil seal (600). The end cap structure further includes a second flow channel, which extends from the first end face to the inner wall of the second annular flange (130), so that the receiving cavity communicates with the oil seal chamber through the second flow channel.

5. The end cap structure according to claim 4, characterized in that, The second flow channel includes a first connecting hole (141) and a second connecting hole (142). The first connecting hole (141) extends from the first end face along the axial direction of the rotating shaft (200), and the second connecting hole (142) extends from the inner wall surface of the second annular flange (130) along the radial direction of the first annular flange (120) and communicates with the first connecting hole (141).

6. The end cap structure according to claim 5, characterized in that, The first flow channel (121) further includes an arc-shaped transition hole (143), which is connected between the first connecting hole (141) and the second connecting hole (142).

7. The end cap structure according to claim 6, characterized in that, The diameters of the first connecting hole (141) and the second connecting hole (142) are d, and the radius of curvature of the arc-shaped transition hole (143) is R. The relationship between d and R is: R≧1.5d.

8. The end cap structure according to claim 4, characterized in that, The first flow channel (121) has a chamfer / groove at the opening on the inner wall of the first bearing chamber; and / or The second flow channel has a chamfer / groove at the opening on the inner wall of the oil seal chamber.

9. The end cap structure according to claim 4, characterized in that, The number of the second flow channels is configured as follows: When the axial thickness L of the oil seal (600) satisfies L≦10mm, 3-4 of the second flow channels are provided; When the axial thickness L of the oil seal (600) satisfies 10mm<L≦20mm, 5-6 of the second flow channels are provided; When the axial thickness L of the oil seal (600) satisfies L>20mm, 7-8 of the second flow channels are provided.

10. The end cap structure according to claim 1, characterized in that, A first positioning structure is disposed on the first end face of the end cover body (100), and a second positioning structure matched with the first positioning structure is disposed on the housing (400). The first positioning structure and the second positioning structure are mutually clamped to position the end cover structure on the housing (400).

11. A permanent magnet servo motor, characterized in that, comprising: a housing (400); a stator (500), a rotor (700) and a rotating shaft (200), wherein the stator (500) and the rotor (700) are located inside the housing (400), the stator (500) is arranged to surround the rotor (700), and the rotating shaft (200) is fixed inside the rotor (700); The end cover structure according to any one of claims 1 to 10, wherein the first end face of the end cover structure is fastened to one end of the housing (400), the first annular flange (120) of the end cover structure protrudes toward the direction of the rotor (700), and a receiving cavity corresponding to the stator (500) is formed between the first annular flange (120) and the housing (400); a first bearing (300), wherein the first bearing (300) is located in the first bearing chamber of the end cover structure; The permanent magnet servo motor further comprises potting adhesive, the potting adhesive fills the receiving cavity and the first flow channel (121) of the end cover structure, and the outer side face of the first bearing (300) is fixed by the potting adhesive.

12. The permanent magnet servo motor according to claim 11, characterized in that, The permanent magnet servo motor further comprises an oil seal (600), and the oil seal (600) is located in the oil seal chamber of the end cover structure; The potting adhesive also fills the second flow channel of the end cover structure, and the outer side face of the oil seal (600) is fixed by the potting adhesive.

13. The permanent magnet servo motor according to claim 11, characterized in that, The potting adhesive comprises epoxy resin adhesive; The viscosity of the epoxy resin adhesive at a temperature of 25°C or lower is less than or equal to 1000 mPa·s; The cured epoxy resin adhesive has a shear strength of greater than or equal to 10 MPa and a compressive strength of greater than or equal to 50 MPa.

14. The permanent magnet servo motor according to claim 11, characterized in that, Further comprising a rear end cover (800), a second bearing (810) and an encoder (900); The rear end cover (800) is fastened to the other end of the housing (400), and the center of the rear end cover (800) is provided with a second shaft hole (820) through which the rotating shaft (200) passes; A second bearing chamber for accommodating the second bearing (810) is formed on the end face of the rear end cover (800) facing the servo motor, and the second bearing (810) is located in the second bearing chamber; The encoder (900) is connected to the rotating shaft (200) and located outside the housing (400), and an encoder cover (910) is sleeved on the exterior of the encoder (900).

15. An industrial device, characterized in that, Comprising the permanent magnet servo motor according to any one of claims 11 to 14.

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