Motor structure with built-in brake
By integrating the brake stator and rotor into the housing, combined with large-diameter bearing support and labyrinth seal, the problems of increased axial size, poor heat dissipation and poor sealing in traditional motor structures are solved, achieving a compact and efficient motor design suitable for confined spaces and high-precision drive scenarios.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-03-27
AI Technical Summary
Traditional motor structures with built-in brakes suffer from problems such as increased axial dimensions, poor heat dissipation, poor sealing, and low protection levels, making it difficult to meet the needs of confined spaces and high-precision drive scenarios.
The motor structure with a built-in brake fixes the brake stator to the partition plate of the housing, and integrates the brake rotor into the annular groove of the rotor assembly. It uses large-diameter bearings to achieve coaxial support, and combines labyrinth sealing and adhesive coating processes to achieve efficient heat dissipation and a high level of protection.
It achieves a high degree of motor integration, shortens the axial length, improves braking response speed and reliability, adapts to dusty and oily environments, and achieves IP67 protection level.
Smart Images
Figure CN224054036U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to motor technical field especially relates to a built-in brake motor structure. BACKGROUND
[0002] In recent years, with the continuous improvement of the demand for miniaturization and integration of driving systems in the fields of industrial automation, robot technology and precision medical equipment, the built-in brake motor structure has attracted widespread attention due to its compactness and functional integration. Traditional built-in brake motors usually adopt a split design, with the brake installed independently on the motor shaft end or externally, resulting in an increase in overall axial size and making it difficult to meet the application requirements of narrow spaces. In addition, the cooperation structure of the brake stator and rotor in the prior art is usually installed externally, which causes a conflict between the electromagnetic attraction surface and the heat dissipation path of the motor body, and long-term operation is prone to cause high temperature rise, affecting the brake response speed and reliability.
[0003] In terms of structural sealing, the conventional design often introduces multiple joints due to the separate installation of the brake assembly and the control circuit board, resulting in a decrease in the protection level. Especially in dusty, oily or humid environments, the weak link of the seal at the wire harness through the shell is prone to cause circuit short circuit or component corrosion. In addition, the connection structure of the motor rotor and the brake rotor often relies on a solid shaft body, which not only increases the moment of inertia, but also limits the further optimization of the axial space, making it difficult to achieve lightweight design.
[0004] Therefore, there is an urgent need for a highly integrated, reliable and efficient heat dissipation built-in brake motor structure to meet the stringent requirements of compactness, stability and environmental adaptability in high-precision driving scenarios. UTILITY MODEL CONTENTS
[0005] To solve the above technical problems, the purpose of the utility model is to provide a built-in brake motor structure, which is compact and has good braking effect.
[0006] To achieve the above utility model purposes, the utility model adopts the following technical solutions:
[0007] The utility model provides a kind of built-in brake motor structure, including shell, stator assembly and rotor assembly, the stator assembly is fixed in the inner wall of shell, the rotor assembly is located inside stator assembly, one end of the shell is fixed with baffle, brake stator is fixed on the baffle, the rotor assembly includes hollow shaft body, ring groove body and annular magnet, the annular magnet is fixed on the outer wall of ring groove body, the ring groove body is set on hollow shaft body, the ring groove body is rotatably connected with baffle by large diameter bearing, brake rotor is fixed in the ring groove body, and when motor is powered, brake stator and brake rotor are left gap;When the motor is powered off, brake stator and brake rotor attract each other;Buckle cover is further fixed on the baffle, control circuit board is fixed in the accommodating space formed by the baffle and buckle cover, and the wire harness of stator assembly is connected with control circuit board after penetrating the baffle;The other end of the shell is equipped with cover plate, and the hollow shaft body is rotatably connected with cover plate by bearing.
[0008] As a preferred scheme, the outer wall of the ring groove body is in a stepped shape, the annular magnet is fixed on the outer wall of the ring groove body, and a flat surface is formed with the outer wall of the ring groove body.
[0009] As a preferred scheme, the ring groove body and the hollow shaft body are integrally formed, and both the ring groove body and the hollow shaft body are made of stainless steel.
[0010] As a preferred scheme, a counterbore is formed in the middle of the baffle towards the torque sensor, and the inner wall of the ring groove body is rotatably connected with the sidewall of the counterbore by a large diameter bearing.
[0011] As a preferred scheme, a snap spring A is arranged on the sidewall of the counterbore to limit the inner ring of the large diameter bearing.
[0012] As a preferred scheme, a magnetic encoder sensing circuit assembly is further fixed in the counterbore, and a magnetic ring A is further fixed on the opening end of the ring groove body close to the hollow shaft body, and the magnetic ring A is arranged on one side of the magnetic encoder sensing circuit assembly.
[0013] As a preferred scheme, convex rings and convex plates are arranged on the two end surfaces of the baffle close to the outer edge, respectively, and the convex rings and the convex plates abut against the inner wall of the buckle cover and the shell, respectively.
[0014] Compared with the prior art, the utility model has the following beneficial effects:
[0015] The utility model discloses a motor is fixed with brake stator directly on the bulkhead of casing, brake rotor is integrated in the ring groove body of rotor assembly, utilize large diameter bearing to realize the coaxial support of ring groove body and bulkhead, save the axial occupation space of traditional external brake, brake stator and rotor keep the clearance when the motor is energized, close quickly through magnetic attraction when power off, realize zero drag loss and millisecond level brake response, the utility model discloses through axial height integration design, make the overall length greatly shorten, especially suitable for robot joint and other space limited scene. BRIEF DESCRIPTION OF DRAWINGS
[0016] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application and are incorporated herein by reference. The illustrations are shown schematically and are not limiting of the application.
[0017] Fig. 1 It is the cutting structure schematic drawing of the utility model;
[0018] Fig. 2 And Fig. 3 It is the explosion structure schematic drawing of two different angles of the utility model.
[0019] The signs are: 111, buckle cover;112, inner protection pipe;12, control circuit board;13, bulkhead;130, counterbore;131, magnetic encoder induction circuit assembly;132, convex ring;133, convex plate;14, clamp spring A;15, large diameter bearing;20, casing;21, stator assembly;22, rotor assembly;220, magnetic ring A;221, hollow shaft body;222, ring groove body;23, annular magnet;24, bearing;30, brake stator;31, brake rotor. DETAILED DESCRIPTION
[0020] It should be noted that the following detailed description is illustrative only, and is intended to provide further description in connection with the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.
[0022] Further, in the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.
[0023] Further, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more, unless otherwise explicitly limited.
[0024] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0025] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0026] The utility model will be further described below in combination with the drawings and examples:
[0027] As Figs. 1 to 3As shown, a built-in brake motor structure, comprising a shell 20, a stator assembly 21 fixed on the inner wall of the shell 20, and a rotor assembly 22 located inside the stator assembly 21, one end of the shell 20 is fixed with a partition plate 13, the partition plate 13 is fixed with a brake stator 30, the rotor assembly 22 comprises a hollow shaft body 221, a ring groove body 222 and a ring magnet 23, the ring magnet 23 is fixed on the outer wall of the ring groove body 222, the ring groove body 222 is sleeved on the hollow shaft body 221, the ring groove body 222 is rotatably connected with the partition plate 13 through a large diameter bearing 15, the brake rotor 31 is fixed in the ring groove body 222, and when the motor is powered on, there is a gap between the brake stator 30 and the brake rotor 31; when the motor is powered off, the brake stator 30 and the brake rotor 31 are attracted to each other; the partition plate 13 is also fixed with a buckle cover 111, the control circuit board 12 is fixed in the accommodating space formed by the partition plate 13 and the buckle cover 111, and the wire harness of the stator assembly 21 is connected with the control circuit board 12 after penetrating through the partition plate 13; the other end of the shell is provided with a cover plate, and the hollow shaft body 221 is rotatably connected with the cover plate through a bearing.
[0028] The ring groove body 222 and the hollow shaft body 221 are integrally formed, and the ring groove body 222 and the hollow shaft body 221 are both made of stainless steel; under the premise of ensuring strength, the weight is reduced by more than 40% compared with the traditional solid shaft, the moment of inertia of the rotor assembly is reduced, the magnetic isolation effect can be achieved, and the interference of the motor magnetism on the brake magnetism is prevented; the outer wall of the ring groove body 222 is in a stepped shape, the ring magnet 23 is fixed on the outer wall of the ring groove body 222, and the outer wall of the ring groove body 222 is in a flat surface, so that the air gap magnetic field distortion is avoided, and the motor torque density is further improved.
[0029] The middle part of the partition plate 13 forms a counterbore 130 facing the torque sensor 6, and the inner wall of the ring groove body 222 is rotatably connected with the side wall of the counterbore 130 through a large diameter bearing 15. The side wall of the counterbore 130 is also provided with a circlip A14 for limiting the inner ring of the large diameter bearing 15. The large diameter bearing can meet the installation space requirement of the brake, and can better support the rotor assembly, significantly improve the radial bearing capacity of the rotor, and suppress the deflection vibration during high speed operation.
[0030] The counterbore 130 is also fixed with a magnetic encoder sensing circuit assembly 131, and the opening end of the ring groove body 222 is also fixed with a magnetic ring A220 close to the hollow shaft body 221, and the magnetic ring A220 is arranged on one side of the magnetic encoder sensing circuit assembly 131.
[0031] The two end faces of the partition plate 13 close to the outer edges are respectively provided with a convex ring 132 and a convex plate 133, the convex ring 132 and the convex plate 133 are respectively abutted with the inner wall of the cover 111 and the shell 20, and the partition plate 13, the cover 111 and the shell 20 are sealed by gluing. The partition plate 13, the convex ring 132 and the convex plate 133 form a labyrinth sealing interface with the shell 20 and the cover 111, and the gluing process is combined, so that the IP67 protection level is achieved, and the high-humidity and dusty industrial environment is adapted.
[0032] The motor integrates the brake stator and the brake rotor in the axial space formed by the shell and the partition plate, and the installation area of the traditional split brake is compressed to the inside of the motor body. Through the support of the ring groove body and the large-diameter bearing, coaxial rigid connection of the brake rotor and the motor rotor assembly is realized. This design integrates the brake function and the driving function in the same axial space, and the axial length is greatly shortened compared with the traditional external brake motor, and is especially suitable for space-limited scenes such as robot joints and medical equipment.
[0033] The partition plate not only serves as a structural support member, but also isolates the motor body (high-temperature area) and the sealed cavity of the control circuit board. The wire harness of the stator assembly is directly connected to the control circuit board through the through hole of the partition plate, so that the length of the power cable is shortened, and electromagnetic interference is reduced. Meanwhile, the heat generated during the operation of the motor is dissipated outward through the axial hollow structure of the shell outer wall and the hollow shaft body, and the sealed cavity of the control circuit board is sealed by the convex ring and the convex plate of the cover and the partition plate, so that the intrusion of external dust and oil is prevented, and IP67 level protection is realized.
[0034] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0035] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application without departing from the principles and purposes of the present application. Any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments still belongs to the scope of the technical scheme of the present application.
Claims
1. A built-in brake motor structure, comprising a shell (20), a stator assembly (21) and a rotor assembly (22), the stator assembly (21) is fixed on the inner wall of the shell (20), and the rotor assembly (22) is located inside the stator assembly (21), characterized in that: one end of the shell (20) is fixed with a partition plate (13), the partition plate (13) is fixed with a brake stator (30), the rotor assembly (22) comprises a hollow shaft body (221), a ring groove body (222) and a ring magnet (23), the ring magnet (23) is fixed on the outer wall of the ring groove body (222), the ring groove body (222) is sleeved on the hollow shaft body (221), the ring groove body (222) is rotatably connected with the partition plate (13) through a large diameter bearing (15), the brake rotor (31) is fixed in the ring groove body (222), and when the motor is powered on, a gap is left between the brake stator (30) and the brake rotor (31); when the motor is powered off, the brake stator (30) and the brake rotor (31) are attracted to each other; the partition plate (13) is further fixed with a buckle cover (111), a control circuit board (12) is fixed in the accommodating space formed by the partition plate (13) and the buckle cover (111), and the wire harness of the stator assembly (21) is connected with the control circuit board (12) after penetrating through the partition plate (13); the other end of the shell is provided with a cover plate, and the hollow shaft body (221) is rotatably connected with the cover plate through a bearing.
2. The electric motor structure with a built-in brake according to claim 1, characterized by, The outer wall of the ring groove body (222) is in a stepped shape, the ring magnet (23) is fixed on the outer wall of the ring groove body (222), and the outer wall of the ring groove body (222) is formed as a flat surface.
3. The electric motor structure with a built-in brake according to claim 1, characterized by, The ring groove body (222) and the hollow shaft body (221) are integrally formed, and both the ring groove body (222) and the hollow shaft body (221) are made of stainless steel.
4. The electric motor structure with a built-in brake according to claim 1, characterized by, The middle part of the partition plate (13) is formed with a counterbore (130) facing the torque sensor (6), and the inner wall of the ring groove body (222) is rotatably connected with the side wall of the counterbore (130) through the large diameter bearing (15).
5. The electric motor structure with a built-in brake according to claim 4, characterized by, The side wall of the counterbore (130) is further provided with a circlip A (14) for limiting the inner ring of the large diameter bearing (15).
6. The electric motor structure with a built-in brake according to claim 4, wherein A magnetic encoder sensing circuit assembly (131) is further fixed in the counterbore (130), a magnetic ring A (220) is further fixed at the opening end of the ring groove body (222) close to the hollow shaft body (221), and the magnetic ring A (220) is arranged on one side of the magnetic encoder sensing circuit assembly (131).
7. The electric motor structure with a built-in brake according to claim 1, wherein The two end faces of the partition plate (13) close to the outer edge are respectively provided with a convex ring (132) and a convex plate (133), the convex ring (132) and the convex plate (133) respectively abut against the inner wall of the buckle cover (111) and the shell (20), and the partition plate (13), the buckle cover (111) and the shell (20) are sealed by gluing.