Brush motor with magnetic declination permanent magnet

Abstract

The utility model discloses a brush motor with a magnetic declination permanent magnet, which comprises a shell, a front end cover, a rear end cover, a stator assembly, a rotor assembly and a carbon brush disc, one end of the shell is fixed with the front end cover, the other end of the shell is fixed with the rear end cover, the stator assembly is positioned in the shell and is fixed with the shell, and the rotor assembly penetrates through the stator assembly. The rotor assembly is in running fit with the front end cover and the rear end cover, the carbon brush disc is matched with the rotor assembly, the stator assembly comprises a plurality of stator sections, the stator sections are arranged in the axial direction of the shell, each stator section comprises a plurality of supporting springs and a plurality of permanent magnets arranged in the circumferential direction of the shell at intervals, and the supporting springs are arranged in the shell. The supporting springs are located in gaps between every two adjacent permanent magnets, the supporting springs are connected with the permanent magnets, and the magnetic poles of every two adjacent permanent magnets arranged in the axial direction of the shell in every two adjacent stator sections are arranged in a staggered mode. According to the utility model, the cogging torque can be effectively reduced, and the rotating speed and torque stability of the motor in the use process can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of brushed motors, in particular to a brushed motor with a permanent magnet having a magnetic deflection angle. Background Art

[0002] With the global pursuit of energy conservation and emission reduction goals, scientific and technological progress and economic development, new energy vehicles and new infrastructure have become important engines of global economic growth. These fields have huge demands for permanent magnet motors. Due to their high efficiency and low energy consumption, permanent magnet motors will be more widely used in industrial production, transportation, household appliances and other fields. Although permanent magnet motors have many advantages, such as simple structure, high reliability, high average efficiency, low temperature rise, small size and light weight, high power factor, high starting torque, high efficiency and energy saving, they also have corresponding disadvantages. Among them, cogging torque is a unique problem of permanent magnet motors. Cogging torque has the following hazards to permanent magnet motors:

[0003] (1) The motor's speed and torque output will become unstable.

[0004] (2) It will increase the energy loss of the motor and lead to a decrease in efficiency.

[0005] (3) The instability of the cogging torque will lead to increased wear between motor components, which may shorten the life of the motor, require more frequent maintenance and higher maintenance costs.

[0006] (4) In some applications, motors need to be precisely controlled according to specific working requirements. The instability of the cogging torque makes it difficult to achieve precise control of the motor, reducing its usability in these applications. Utility Model Content

[0007] The utility model provides a brushed motor with magnetic deflection permanent magnets, which can effectively reduce the cogging torque and improve the stability of the motor's speed and torque during use.

[0008] The technical solutions to the above technical problems are as follows:

[0009] A brushed motor with permanent magnets having magnetic deflection angles comprises a housing, a front end cover, a rear end cover, a stator assembly, a rotor assembly, and a carbon brush disk. One end of the housing is fixed to the front end cover, and the other end of the housing is fixed to the rear end cover. The stator assembly is located within the housing and fixed to the housing. The rotor assembly passes through the stator assembly and is rotationally engaged with the front end cover and the rear end cover, respectively. The carbon brush disk engages with the rotor assembly. The stator assembly comprises a plurality of stator segments, which are arranged axially along the housing. Each stator segment comprises a plurality of support springs and a plurality of permanent magnets arranged at intervals along the circumference of the housing. The support springs are located in the intervals between two adjacent permanent magnets and are connected to the permanent magnets. The magnetic poles of two adjacent permanent magnets arranged axially along the housing in two adjacent stator segments are staggered.

[0010] Furthermore, the end of the permanent magnet is provided with a 90° chamfer.

[0011] Furthermore, the circumferential staggered angle of the magnetic poles of two adjacent permanent magnets arranged along the axial direction of the housing in two adjacent stator segments is 15°.

[0012] Furthermore, the support spring includes a first elastic support body and a second elastic support body. The first elastic support body has a U-shaped groove, and the cross-section of the second elastic support body is L-shaped. After one end of the second elastic support body is fixed to the first elastic support body, a clearance groove is formed between the second elastic support body and the first elastic support body, and the notch of the clearance groove is in the opposite direction to the notch of the first elastic support body.

[0013] Furthermore, a protrusion for cooperating with the inner wall surface of the shell is provided on the surface of the second elastic support body.

[0014] By changing the size, shape, and distribution of the permanent magnets, this utility model effectively reduces cogging torque, thereby improving motor performance and reducing torque fluctuations, vibration, and noise. This results in smoother motor operation, making it suitable for industries such as medical rehabilitation, where smooth operation is crucial. With the aging population in our country, this brushed motor with deflected permanent magnets has extremely high market value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of a brushed motor with magnetic deflection permanent magnets in a first direction.

[0016] Figure 2 It is a three-dimensional diagram of a brushed motor with magnetic deflection permanent magnets in the second direction.

[0017] Figure 3 This is a cross-sectional diagram of a brushed motor with permanent magnets with magnetic deflection.

[0018] Figure 4 A perspective view of the stator assembly.

[0019] Figure 5 This is a diagram of the magnetic pole staggered arrangement of two adjacent permanent magnets arranged along the axial direction of the shell in two adjacent stator segments.

[0020] Figure 6 This is a structural diagram of the support spring.

[0021] Housing 1, front end cover 2, first threaded hole 2a, rear end cover 3, second threaded hole 3a, stator assembly 4, permanent magnet 4a, first elastic support body 4b, second elastic support body 4c, give way groove 4d, protrusion 4e, rotor assembly 5, carbon brush plate 6, bearing 7, screw 8. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementations.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0024] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0026] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0027] like Figures 1 to 6 As shown, the present invention discloses a brushed motor with permanent magnets having magnetic deflection, comprising a housing 1, a front cover 2, a rear cover 3, a stator assembly 4, a rotor assembly 5, a carbon brush disc 6, and a support spring. One end of the housing 1 is fixed to the front cover 2. The housing 1 is provided with an anti-rust layer, which improves its corrosion resistance and makes it suitable for a wide range of harsh applications. The other end of the housing 1 is fixed to the rear cover 3. The stator assembly is located within and fixed to the housing 1. The rotor assembly 5 passes through the stator assembly 4.

[0028] The rotor assembly 5 rotates in conjunction with the front cover 2 and rear cover 3, respectively. In this embodiment, bearings 7 are mounted on both the front cover 2 and rear cover 3. These bearings are 608Z bearings with high load-bearing capacity, capable of supporting the load transfer, thereby maintaining a low coefficient of friction during high-speed operation of the motor, resulting in high rotational accuracy and stability. A screw 8 passes through the rear cover 3, carbon brush disk 6, and support spring, and is then threadedly connected to the front cover 2, thereby securing the rear cover 3, front cover 2, and housing 1 together.

[0029] A first threaded hole 2a is provided on the front end cover 2 for positioning and installing the reduction gearbox, such as changing the driving direction and torque. A second threaded hole 3a is provided on the rear end cover 3 for installing a speed measuring device such as an encoder, thereby expanding the functional items of the motor and increasing high-precision monitoring and application of the motor.

[0030] The carbon brush disc 6 is mated with the rotor assembly 5 and secured to the screw 8. In this embodiment, an integrated carbon brush disc 6 with built-in inductance and capacitance is used. These inductance and capacitance absorb high-frequency energy, preventing it from being output, eliminating electromagnetic interference signals, and preventing high-frequency interference generated by commutator sparks from causing electromagnetic interference to other components of the device during motor operation. This improves the stability and safety of the motor's operation.

[0031] The stator assembly 4 includes a plurality of stator segments, which are arranged axially along the housing 1. Each stator segment includes a plurality of support springs and a plurality of permanent magnets 4a arranged at intervals along the circumference of the housing 1. The support spring is located in the interval between two adjacent permanent magnets 4a and is connected to the permanent magnet 4a. In this embodiment, there are two stator segments, each of which has two permanent magnets 4a and two support springs. The two permanent magnets 4a and the two support springs are alternately arranged along the circumference of the housing 1.

[0032] Each permanent magnet 4a has a 90° chamfer β at its end. The chamfer β can reduce the rate of change of the magnetic field edge, reduce motor vibration, and improve the stability of the motor during operation.

[0033] In this embodiment, the magnetic poles of two adjacent permanent magnets 4a arranged axially along the shell 1 in two adjacent stator segments are staggered. Preferably, the magnetic poles of two adjacent permanent magnets 4a arranged axially along the shell 1 in two adjacent stator segments are staggered by an angle α of 15° in the circumferential direction. This allows the permanent magnets 4a in the stator to adopt a block-wise magnetic pole shifting method. This can optimize the cogging torque, thereby reducing the torque pulsation of the motor, reducing speed fluctuation, and reducing vibration and noise.

[0034] The support spring includes a first elastic support body 4b and a second elastic support body 4c. The first elastic support body 4b has a U-shaped groove, and the second elastic support body 4c has an L-shaped cross-section. After one end of the second elastic support body 4c is fixed to the first elastic support body 4b, a clearance groove 4d is formed between the second elastic support body 4c and the first elastic support body 4b. The screw 8 passes through the clearance groove 4d, and the notch of the clearance groove 4d is opposite to the notch of the first elastic support body 4b. This structure of the support spring makes it easier to press between the two permanent magnets 4a during installation, reducing friction loss with the permanent magnets 4a and the inner wall of the housing 1 during installation, thereby extending the service life.

[0035] The surface of the second elastic support body 4c is provided with a protrusion 4e for cooperating with the inner wall surface of the shell 1. The protrusion 4e increases the friction force of the support spring, effectively reduces the displacement of the permanent magnet 4a, effectively supports the positioning of the permanent magnet 4a, and improves the stability and service life of the motor.

[0036] The installation steps of this utility model are as follows:

[0037] S1, a glue coating machine is installed in the housing 1 and glue is coated on the mounting surface of the permanent magnet 4a with Loctite glue.

[0038] S2, the permanent magnet 4a and the support spring are positioned and pressed into the inner surface of the shell 1, so that the outer ring of the permanent magnet 4a fits with the glue-coated inner surface of the shell 1, and the support spring supports the stator permanent magnet 4a at the specified position to fix the permanent magnet 4a.

[0039] S3, placing the assembled housing 1 and stator assembly 4 into the exhaust system, and using compressed air to blow and extract the interior of the housing 1 through the exhaust system to accelerate the solidification of the glue and remove impurities inside.

[0040] S4, the housing 1 is placed in a magnetizing system to magnetize the permanent magnet 4a.

[0041] S5 , press the carbon brush disc 6 and the bearing 7 into the front cover 2 and the rear cover 3 respectively, and connect the cable to the carbon brush disc 6 .

[0042] S6. After the rotor assembly 5 is installed, the screw 8 is used to pass through the rear end cover 3, the carbon brush plate 6, and the support spring in sequence, so that the screw 8 is threadedly connected with the front end cover 2, so that the rear end cover 3, the front end cover 2 and the outer shell 1 are fastened together.

Claims

1. A brushed motor with a permanent magnet having a magnetic deflection angle, comprising a housing (1), a front end cover (2), a rear end cover (3), a stator assembly (4), a rotor assembly (5), and a carbon brush disk (6), wherein one end of the housing (1) is fixed to the front end cover (2), and the other end of the housing (1) is fixed to the rear end cover (3), the stator assembly is located in the housing (1) and is fixed to the housing (1), the rotor assembly (5) passes through the stator assembly (4), and the rotor assembly (5) is respectively rotatably matched with the front end cover (2) and the rear end cover (3), and the carbon brush disk (6) is matched with the rotor assembly (5), characterized in that The stator assembly (4) comprises a plurality of stator segments, which are arranged axially along the housing (1); each stator segment comprises a plurality of support springs and a plurality of permanent magnets (4a) arranged at intervals along the circumference of the housing (1); the support springs are located in the intervals between two adjacent permanent magnets (4a); the support springs are connected to the permanent magnets (4a); and the magnetic poles of two adjacent permanent magnets (4a) arranged axially along the housing (1) in two adjacent stator segments are staggered.

2. A brushed motor with permanent magnets with magnetic deflection according to claim 1, characterized in that: The end of the permanent magnet (4a) is provided with a 90° chamfer (β).

3. A brushed motor with permanent magnets with magnetic deflection according to claim 1, characterized in that: The circumferential staggered angle of the magnetic poles of two adjacent permanent magnets (4a) arranged axially along the housing (1) in two adjacent stator segments is 15 degrees.

4. A brushed motor with permanent magnets with magnetic deflection according to claim 1, characterized in that: The support spring comprises a first elastic support body (4b) and a second elastic support body (4c); the first elastic support body (4b) has a U-shaped groove; the cross section of the second elastic support body (4c) is L-shaped; after one end of the second elastic support body (4c) is fixed to the first elastic support body (4b), a clearance groove (4d) is formed between the second elastic support body (4c) and the first elastic support body (4b); the notch of the clearance groove (4d) is in the opposite direction to the notch of the first elastic support body (4b).

5. A brushed motor with permanent magnets with magnetic deflection according to claim 4, characterized in that: The surface of the second elastic support body (4c) is provided with a protrusion (4e) for cooperating with the inner wall surface of the shell (1).

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