A handrail motor stator assembly

Abstract

This utility model discloses a stator assembly for an armrest motor, including a housing, a pair of permanent magnets symmetrically arranged inside the housing, and a magnetic protective ring fixed to the outside of the housing. Two supporting bosses are fixed to the inner end of each permanent magnet on the inner side of the housing, with the inner end of the permanent magnet abutting against the supporting bosses. The outer part of the permanent magnet is fixed to the inner wall of the housing by an adhesive layer. This utility model, through innovative magnetic protective ring design, optimized fixing method, and material selection, effectively solves the problems of magnetic leakage and complex assembly in traditional armrest motor stator assemblies, significantly improving the performance and reliability of the product.

Description

Technical Field

[0001] This utility model relates to a handrail motor stator assembly. Background Technology

[0002] An armrest motor is an electric motor used to drive the movement of armrests. It is commonly found in the armrest adjustment systems of electric seats, wheelchairs, lifting devices, or vehicles (such as cars, high-speed trains, and airplanes).

[0003] The stator assembly of a handrail motor typically includes a housing and a pair of permanent magnets symmetrically fixed inside the housing. The permanent magnets are fixed together by spring steel sheets. This structure has the following drawbacks: 1. Since the permanent magnets are in direct contact with the housing, magnetic leakage will occur; 2. The permanent magnets are fixed together by spring steel sheets, which makes the assembly more complicated and the cost higher. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a handrail motor stator assembly, which effectively solves the problems mentioned in the background art.

[0005] The technical solution adopted in this utility model is:

[0006] A handrail motor stator assembly includes a housing, a pair of permanent magnets symmetrically arranged inside the housing, and a magnetic guard ring fixed to the outside of the housing. Two support bosses are fixed to the inner end of each permanent magnet on the inner side of the housing. The inner end of the permanent magnet abuts against the support bosses, and the outer part is fixed to the inner wall of the housing by an adhesive layer. The magnetic guard ring is positioned to match the permanent magnets, and both ends of the magnetic guard ring extend beyond the two ends of the permanent magnets.

[0007] Preferably, the magnetic ring is fixed to the housing by a snap-fit ​​structure.

[0008] Preferably, the snap-fit ​​structure includes a snap-fit ​​opening on the outside of the housing and a snap-fit ​​head fixed on the inside of the magnetic ring. The snap-fit ​​opening and the snap-fit ​​head are matched, and the magnetic ring has an axially extending slit on the opposite side of the snap-fit ​​structure that penetrates the magnetic ring.

[0009] Preferably, the protective magnetic ring is made of a soft magnetic material with high magnetic permeability and low electrical conductivity.

[0010] Preferably, the thickness of the magnetic protective ring is 0.5-2 mm.

[0011] Preferably, the material of the protective magnet ring is an iron-silicon-aluminum alloy or an amorphous alloy.

[0012] The innovative points of this utility model are as follows:

[0013] 1. Magnetizing ring design:

[0014] A protective magnetic ring matching the position of the permanent magnet was added to the outside of the casing, with both ends of the protective magnetic ring extending beyond the two ends of the permanent magnet.

[0015] The protective magnetic ring is made of soft magnetic material with high magnetic permeability and low electrical conductivity (such as iron-silicon-aluminum alloy or amorphous alloy), with a thickness of 0.5-2mm;

[0016] 2. Fixing the support boss to the adhesive layer:

[0017] Two support protrusions are provided at the inner end of each permanent magnet on the inner side of the casing. The inner end of the permanent magnet abuts against the support protrusions, and the outer part is fixed to the inner wall of the casing by an adhesive layer.

[0018] This dual-fixation method (mechanical support + adhesive bonding) replaces the traditional spring steel sheet fixing structure;

[0019] 3. Snap-fit ​​structure:

[0020] The magnetic ring is fixed to the housing through a snap-fit ​​structure, which includes a snap-fit ​​opening on the outside of the housing and a snap-fit ​​head on the inside of the magnetic ring. The snap-fit ​​structure not only serves to connect and fix the ring, but also has a positioning function, thereby improving the fixing strength of the magnetic ring.

[0021] The magnetic ring has a through-slit along the axial direction on the opposite side of the snap-fit ​​structure to facilitate installation and disassembly.

[0022] The beneficial effects of this utility model are:

[0023] 1. Reduce magnetic leakage problems:

[0024] The protective magnet ring is made of a high magnetic permeability material, which can effectively guide the magnetic field and reduce magnetic leakage caused by direct contact between the permanent magnet and the housing, thereby improving motor efficiency;

[0025] 2. Simplify assembly and reduce costs:

[0026] The dual fixing method of supporting boss and adhesive layer simplifies the complex assembly process of traditional spring steel sheet structure and reduces production costs;

[0027] The snap-fit ​​design makes the installation of the magnetic ring more convenient and further improves assembly efficiency;

[0028] 3. Improve structural stability and safety:

[0029] The two ends of the protective magnetic ring extend beyond the two ends of the permanent magnet, which enhances the magnetic field shielding effect and improves the overall stability of the structure.

[0030] The combination of adhesive layer fixation and mechanical support for the supporting boss ensures the stability of the permanent magnet during operation and reduces the risk of loosening;

[0031] 4. Material optimization:

[0032] The protective magnet is made of iron-silicon-aluminum alloy or amorphous alloy, which has both high magnetic permeability and low electrical conductivity. This optimizes the magnetic field distribution, reduces eddy current losses, and improves motor performance.

[0033] This invention effectively solves the problems of magnetic leakage and complex assembly of traditional handrail motor stator components through innovative magnetic ring design, optimized fixing method and material selection, significantly improving the performance and reliability of the product. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of this utility model;

[0035] Figure 2 This is a schematic diagram of the casing structure;

[0036] Figure 3 This is a schematic diagram of the structure of the magnetron. Detailed Implementation

[0037] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, 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 pertains.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] Furthermore, 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," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] 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, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of 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.

[0042] 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.

[0043] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0044] like Figure 1-3 As shown, a handrail motor stator assembly includes a housing 1, a pair of permanent magnets 2 symmetrically arranged inside the housing 1, and a magnetic guard ring 3 fixed to the outside of the housing 1. Two support bosses 4 are fixed to the inner end of each permanent magnet 2 on the inner side of the housing 1. The support bosses 4 are integrally formed with the housing 1. The inner end of the permanent magnet 2 abuts against the support bosses 4, and the outer part is fixed to the inner wall of the housing 1 by an adhesive layer. The magnetic guard ring 3 is matched with the position of the permanent magnet 2, and both ends of the magnetic guard ring 3 extend beyond the two ends of the permanent magnet 2.

[0045] The magnetic protective ring 3 is fixed to the housing 1 by a snap-fit ​​structure.

[0046] The snap-fit ​​structure includes a snap-fit ​​opening 5 on the outside of the housing 1 and a snap-fit ​​head 6 fixed inside the magnetic ring 3. The snap-fit ​​opening 5 and the snap-fit ​​head 6 are matched. The magnetic ring 3 has a slit 7 that penetrates the magnetic ring 3 along the axial direction on the opposite side of the snap-fit ​​structure.

[0047] The magnetic protective ring 3 is made of a soft magnetic material with high magnetic permeability and low electrical conductivity.

[0048] The thickness of the magnetic protective ring is 0.5-2mm.

[0049] The material of the magnetic protective ring 3 is an iron-silicon-aluminum alloy or an amorphous alloy.

[0050] This utility model mainly focuses on three major goals: reducing magnetic leakage, simplifying assembly, and enhancing structural stability. Its core lies in the innovative design of the magnetic protective ring and the method of fixing the permanent magnet. The following is a detailed analysis of its working principle:

[0051] I. Core Component Functions and Working Principles:

[0052] 1. Magnetizing ring:

[0053] Material properties: Soft magnetic materials with high magnetic permeability (such as iron-silicon-aluminum alloys / amorphous alloys) and low electrical conductivity are used;

[0054] High magnetic permeability → guides the magnetic field to form a closed loop through the protective magnetic ring, reducing the leakage of magnetic lines of force from the casing;

[0055] Low electrical conductivity → reduces eddy current losses generated in alternating magnetic fields, avoiding heat generation and energy loss;

[0056] Structural design:

[0057] The protective ring wraps around the outside of the casing, extending beyond the boundary of the permanent magnet at both ends → expanding the magnetic field shielding range and preventing magnetic leakage at the ends of the permanent magnet;

[0058] Thickness 0.5-2mm → Balances magnetic shielding effect and space occupation; too thin and magnetic saturation is easy, too thick and volume and cost are increased.

[0059] Working principle:

[0060] The magnetic protective ring, as an external magnetic channel, confines the magnetic field that might otherwise leak inside the motor, thereby improving the utilization rate of the magnetic field.

[0061] 2. Permanent magnet fixing structure:

[0062] Double fixation with support boss and adhesive layer:

[0063] Support boss: Located inside the housing and at the inner end of the permanent magnet, it provides mechanical restraint and resists radial electromagnetic force;

[0064] Adhesive layer: The outer side of the permanent magnet is bonded to the inner wall of the casing with adhesive → filling the gap, eliminating the risk of vibration and loosening, and at the same time assisting in magnetic isolation;

[0065] Replacement for spring steel sheets: Traditional spring steel sheets require precision assembly and additional parts. This solution simplifies the process by using a support boss with an integrally molded housing and automated glue application.

[0066] 3. Snap-fit ​​type magnet ring installation:

[0067] Bayonet (casing) + Card head (magnetic ring): Enables rapid positioning and fixation;

[0068] Axial slot (opened on opposite sides):

[0069] During assembly, the gap allows the magnetic ring to deform elastically, making it easier for the chuck to slide into the bayonet.

[0070] During disassembly, widen the gap and then release the clip from the bayonet; no destructive operation is required.

[0071] II. Overall Workflow and Advantages:

[0072] 1. Reduce magnetic leakage (improve efficiency):

[0073] The magnet ring confines the magnetic field of the permanent magnet inside the motor → increases the effective air gap magnetic flux density → improves torque output and motor efficiency;

[0074] The adhesive layer fills the gap between the permanent magnet and the housing → reducing the air magnetic resistance path and further suppressing magnetic leakage;

[0075] 2. Simplify assembly (reduce costs):

[0076] Permanent magnet installation:

[0077] Steps: Place the permanent magnet → press the inner end against the support boss → apply glue to the outer side to fix it;

[0078] Magnet ring installation: The snap-fit ​​structure enables "one-click locking" without the need for additional fasteners;

[0079] 3. Enhanced stability and security:

[0080] The magnetic ring wraps around the casing → improves structural rigidity and suppresses casing vibration;

[0081] Double-fixed permanent magnets → Prevent permanent magnet displacement or detachment during high-speed operation;

[0082] The protective magnet extends to cover the boundary of the permanent magnet → preventing the leakage of the end magnetic field from interfering with surrounding electronic equipment.

[0083] 4. Optimize electromagnetic performance:

[0084] Low eddy current loss: The low conductivity material of the protective magnet reduces eddy current generation → reduces temperature rise and extends lifespan;

[0085] Uniform magnetic field distribution: The protective magnetic ring guides the magnetic field to pass evenly through the air gap → reducing torque pulsation and making the operation smoother;

[0086] Performance comparison with traditional structures:

[0087] index Traditional structure (elastic steel sheet) This utility model Improvement effect Leakage rate High (casing in direct contact with permanent magnet) Low (magnetic coil shielding) Efficiency improved by 5-10% Assembly steps Complex (elastic steel plate positioning + fastening) Simple (protrusion positioning + glue application + clips) Working hours reduced by 30% Eddy current loss High (the casing is a good conductor) Low (low conductivity of the magnetron) Temperature rise decreased by 15-20℃ Permanent magnet fixed Point contact (easily loosens) Surface contact (adhesive layer) + mechanical limit Improved vibration resistance

[0088] Finally, it should be noted that the above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A handrail motor stator assembly, characterized by, Includes a housing (1), a pair of permanent magnets (2) symmetrically arranged inside the housing (1), and a protective magnetic ring (3) fixed on the outside of the housing (1). The inner side of the housing (1) has two supporting bosses (4) fixed at the inner end of each permanent magnet (2). The inner end of the permanent magnet (2) abuts against the supporting bosses (4), and the outer part is fixed to the inner wall of the housing (1) by an adhesive layer.

2. A handrail motor stator assembly according to claim 1, wherein, The magnetic ring (3) is fixed to the housing (1) by a snap-fit ​​structure.

3. A handrail motor stator assembly according to claim 2, wherein, The snap-fit ​​structure includes a snap-fit ​​opening (5) on the outside of the housing (1) and a snap-fit ​​head (6) fixed inside the magnetic ring (3). The snap-fit ​​opening (5) and the snap-fit ​​head (6) are matched. The magnetic ring (3) has a slit (7) that penetrates the magnetic ring (3) along the axial direction on the opposite side of the snap-fit ​​structure.

4. A handrail motor stator assembly according to claim 3, wherein, The magnetic ring (3) is made of a soft magnetic material with high permeability and low electrical conductivity.

5. A handrail motor stator assembly according to claim 4, wherein, The thickness of the magnetic protective ring is 0.5-2mm.

6. A handrail motor stator assembly according to claim 5, wherein, The material of the magnetic protective ring (3) is an iron-silicon-aluminum alloy or an amorphous alloy.

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