Rotor connection structure and brushless motor

Abstract

The utility model relates to the technical field of motors, and discloses a rotor connection structure, which includes a first shell, a spring sheet, and a first bearing. The first shell is internally formed with a mounting cavity for accommodating a rotor assembly; the spring sheet includes an annular body and a plurality of convex parts, the annular body is installed at the bottom of the first shell, and the plurality of convex parts are spaced inside the annular body, and together form a limited position area at the center of the annular body; the first bearing is used to be sleeved on the rotor assembly, the first bearing is installed in the limited position area, and the plurality of convex parts abut against the outer periphery of the first bearing, so that the first bearing does not contact the first shell. The rotor connection structure of the utility model avoids the problem that the provision of spring sheets and gaskets will generate a large resistance to the rotation of the rotor, which may easily lead to a reduction in the motor speed, and also increase the kinetic energy loss, which is not conducive to energy saving and environmental protection.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor connection structure and a brushless motor. Background Art

[0002] A brushless motor is a brushless permanent magnet DC motor that achieves motor commutation through electronic control without the need for mechanical brushes and commutators. Compared with brushed motors, brushless motors have higher efficiency, longer life, less noise and higher operating speeds. The working principle of a brushless DC motor is based on the principles of electromagnetic induction and Lorentz force. When current passes through the stator coil, a rotating magnetic field is generated. The permanent magnets in the rotor are subjected to the Lorentz force in this rotating magnetic field, causing the rotor to rotate with the stator magnetic field. The controller achieves motor commutation by controlling the current and magnetic field. Brushless motors have advantages in many applications, such as high efficiency, low noise, high speed and high torque. They are widely used in electric vehicles, home appliances, industrial equipment, aerospace and other fields.

[0003] When the brushless motor is working, it is often accompanied by some vibration. The vibration will increase the mechanical wear of the brushless motor, which may shorten the life of the motor and reduce the performance of the brushless motor. If the vibration is too large, it may cause damage to the components of the electronic commutator, thereby increasing the failure rate of the brushless motor. In the related art, a spring is usually set between the motor stator and the rear housing, and the rotor passes through the motor stator, the spring and the rear housing in sequence, so that the vibration of the motor is reduced. However, the spring is not wear-resistant, so it is often necessary to set a gasket between the stator and the spring and between the spring and the rear housing to prevent the spring from wearing.

[0004] However, the provision of the spring pieces and gaskets will produce greater resistance to the rotation of the rotor, which may easily lead to a reduction in the motor speed and also increase the kinetic energy loss, which is not conducive to energy conservation and environmental protection. Utility Model Content

[0005] In order to solve the deficiencies of the prior art, the utility model provides a rotor connection structure and a brushless motor, which avoids the problem that the provision of spring sheets and gaskets will generate greater resistance to the rotation of the rotor, easily leading to a reduction in the motor speed, while also increasing kinetic energy loss, which is not conducive to energy conservation and environmental protection.

[0006] The technical effects to be achieved by the utility model are achieved through the following aspects:

[0007] In a first aspect, the utility model provides a rotor connection structure, comprising:

[0008] A first housing is formed with a mounting cavity for accommodating a rotor assembly;

[0009] The spring piece comprises an annular body and a plurality of convex parts, wherein the annular body is mounted on the bottom of the first shell, and the plurality of convex parts are arranged inside the annular body at intervals to form a limited position area at the center of the annular body;

[0010] The first bearing is used to be sleeved on the rotor assembly. The first bearing is installed in the limiting area, and a plurality of the protrusions abut against the outer periphery of the first bearing so that the first bearing does not contact the first housing.

[0011] In some implementations, the plurality of protrusions include a connecting end and a free end, the connecting end is connected to the annular body, and the free end abuts against the first bearing.

[0012] In some implementations, the convex portion forms an angle with the plane where the annular body is located.

[0013] In this implementation, the convex portion forms an angle with the plane where the annular body is located, which generates a directional elastic force on the first bearing, so that the shock absorbing effect of the spring sheet is more excellent.

[0014] In some implementations, a boss is laterally extended from the outer peripheral side of the first bearing away from the annular body, and the free end abuts against the boss.

[0015] In this implementation, the first bearing is extended with a boss so that the free end of the spring piece protrusion is more stable when it abuts against the first bearing, preventing the first bearing from moving under the elastic force of the free end. While ensuring the shock absorption effect, the overall structure of the rotor connection structure is more stable.

[0016] In some implementations, a plurality of the protrusions are evenly spaced apart and disposed inside the annular body, and the plurality of the protrusions together form a limited position area at the center of the annular body.

[0017] In this implementation, the convex portions are evenly spaced inside the annular body, so that the elastic force generated by the spring sheet is more uniform, and the shock absorbing effect brought by the spring sheet is further improved, thereby producing a better shock absorbing effect on the motor.

[0018] In some implementations, the first shell is provided with an installation window, the installation window is connected to the installation cavity, the first bearing is installed in the installation window, and the convex portion of the spring sheet protrudes toward the installation window.

[0019] In this implementation, since the first shell is provided with an installation window, the protrusion of the spring piece can protrude into the installation window. While ensuring that the spring piece achieves a shock-absorbing effect, the protrusion of the spring piece protrudes toward the installation window, so that the space occupied by the spring piece is smaller, and the space occupied by the overall structure of the motor is further smaller, and the structure is more compact, so that it can adapt to the installation of some equipment that can only accommodate small motors.

[0020] In some implementations, a bottom cover is further included, the bottom cover is connected to a side of the spring sheet away from the first shell, the bottom cover is provided with a mounting through hole, and the first bearing is passed through the mounting through hole.

[0021] In the second aspect, the utility model provides a brushless motor, including a second shell, a stator assembly, a rotor assembly, a second bearing and a rotor connection structure, the interior of the second shell and the first shell jointly form an installation cavity for accommodating the stator assembly and the rotor assembly, the rotor assembly is inserted into the stator assembly, and the second bearing is sleeved on one end of the rotor assembly away from the first bearing.

[0022] In some implementations, a top cover is further included, wherein the top cover is connected to a side of the second shell away from the first shell, the top cover is provided with a device through hole, and the second bearing is fixed in the device through hole.

[0023] In this implementation, the top cover serves to limit the second bearing, so that the second bearing does not slide when the rotor assembly rotates. Moreover, the top cover also protects the second shell, thereby preventing the second shell from being scratched against external equipment and causing wear on the second shell.

[0024] In some implementations, a gasket is further included, wherein the gasket is connected to the boss of the first bearing so that the rotor assembly does not wear against the boss.

[0025] In summary, the utility model has at least the following benefits:

[0026] The rotor connection structure provided by the utility model has a first bearing installed in the limiting area of ​​the spring sheet, and the rotor assembly is inserted into the first bearing. The rotor assembly does not directly contact the spring sheet. The spring sheet has a shock-absorbing effect and does not generate friction with the rotor assembly, so that the rotor assembly is subject to less resistance during rotation, thereby avoiding the problem that the provision of the spring sheet and the gasket will generate greater resistance to the rotation of the rotor assembly, which may easily lead to a reduction in the motor speed and increase the kinetic energy loss, which is not conducive to energy saving and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the rotor connection structure of some embodiments;

[0028] Figure 2 for Figure 1 The schematic diagram of the structure of the shrapnel shown;

[0029] Figure 3 for Figure 2 Another perspective structural diagram of the shrapnel shown;

[0030] Figure 4 for Figure 1 A schematic cross-sectional view of the spring piece and the first bearing shown;

[0031] Figure 5 for Figure 1 Another perspective structural schematic diagram of the rotor connection structure shown;

[0032] Figure 6 Schematic diagram of the structure of a brushless motor in some embodiments.

[0033] Markings in the figure:

[0034] 10. Rotor connection structure;

[0035] 100, first housing; 101, mounting cavity; 102, mounting window;

[0036] 200, spring piece; 210, annular body; 220, convex portion; 221, connecting end; 222, free end; 2221, bending angle; 223, included angle; 230, limiting area;

[0037] 300, first bearing; 310, boss;

[0038] 400, bottom cover; 401, mounting through hole;

[0039] 20. Brushless motor;

[0040] 500, second housing;

[0041] 600, stator assembly;

[0042] 700, rotor assembly;

[0043] 800, second bearing;

[0044] 900, top cover; 901, device through hole;

[0045] 1000. Gasket. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. The described implementation is a part of the implementation of the utility model, not all of the implementations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0048] Embodiment 1:

[0049] Please see attached Figures 1 to 4 The rotor connection structure 10 of the utility model includes a first housing 100 , a spring sheet 200 and a first bearing 300 .

[0050] Please combine Figure 1 and Figure 2 , Figure 1 The structure relationship among the first housing, the spring sheet and the first bearing in the embodiment of the utility model is shown in FIG. Figure 2 The specific structure of the spring in the embodiment of the utility model is illustrated. Specifically, a mounting cavity 101 for accommodating the rotor assembly 700 is formed inside the first housing 100, and the spring 200 includes an annular body 210 and a plurality of protrusions 220. The annular body 210 is mounted at the bottom of the first housing 100, and the plurality of protrusions 220 are arranged inside the annular body 210 at intervals, and together form a limited position area 230 at the center of the annular body 210; the first bearing 300 is used to be sleeved on the rotor assembly 700, and the first bearing 300 is installed in the limited position area 230, and the plurality of protrusions 220 abut against the outer periphery of the first bearing 300, so that the first bearing 300 does not contact the first housing 100.

[0051] In this embodiment, the rotor assembly 700 is installed in the installation cavity 101 of the first shell 100, and the spring piece 200 is installed at the bottom of the first shell 100, so that a shock-absorbing effect is generated when the motor rotates. At the same time, the noise generated by the motor is reduced due to the reduced vibration. Several protrusions 220 of the spring piece 200 form a limited area 230 at the center of the annular body 210 of the spring piece 200 for the first bearing 300 to pass through. Several protrusions 220 achieve better shock-absorbing effect. The rotor assembly 700 is sequentially penetrated in the first shell 100 and the first bearing 300. Since the rotor assembly 700 does not contact the spring piece 200 and the first shell 100, when the motor rotates, the spring piece 200 has a shock-absorbing effect while the rotor assembly 700 does not generate friction with the spring piece 200, thereby reducing the resistance of the rotor assembly 700. Furthermore, the first bearing 300 does not come into contact with the first housing 100, so that when the motor rotates, the first housing 100 is not affected by the vibration of the rotor assembly 700, and the motor rotates with less noise. Preferably, the spring 200 is in the shape of a petal with a hollow center, and the first bearing 300 is installed in the hollow part.

[0052] In the above-mentioned rotor connection structure 10, since the first bearing 300 is installed in the limiting area 230 of the spring sheet 200, the rotor assembly 700 is inserted into the first bearing 300, and the rotor assembly 700 is not in direct contact with the spring sheet 200. While the spring sheet 200 has a shock-absorbing effect, it does not generate friction with the rotor assembly 700, so that the rotor assembly 700 is subject to less resistance during rotation, thereby avoiding the problem that the spring sheet 200 and the gasket 1000 will generate greater resistance to the rotation of the rotor assembly 700, which may easily lead to a reduction in the motor speed, while also increasing the kinetic energy loss, which is not conducive to energy saving and environmental protection.

[0053] In some preferred embodiments, the plurality of protrusions 220 include a connecting end 221 and a free end 222, wherein the connecting end 221 is connected to the annular body 210, and the free end 222 abuts against the first bearing 300. When the motor is rotating, the vibration generated by the rotation of the rotor assembly 700 is dispersed by the free ends 222 of the plurality of protrusions 220, so that the vibration of the motor is reduced, thereby achieving a better shock absorption effect.

[0054] In some preferred embodiments, see Figure 3 , Figure 3The schematic diagram shows the structural relationship between the spring piece and the annular body in another perspective in an embodiment of the utility model. Specifically, the convex portion 220 forms an angle 223 with the plane where the annular body 210 is located. A directional elastic force is generated on the first bearing 300, so that the shock absorption effect of the spring piece 200 is more superior. It can be understood that the size of the angle 223 can be adjusted according to design requirements. In the embodiment of the utility model, after the convex portion 220 forms the angle 223 with the annular body 210, its free end 222 is tilted relative to the plane where the annular body 210 is located, so that the first bearing 300 can be lifted, effectively increasing the upward elastic force perpendicular to the annular body 210, which can generate sufficient supporting force for the rotor and is more conducive to shock absorption. In addition, in some other embodiments, the angles 223 between each convex portion 220 and the annular body 210 can be equal or unequal. When the angles 223 are unequal, multiple different levels of shock absorption effects can be formed.

[0055] In some preferred embodiments, see Figure 4 , Figure 4 The specific structure of the first bearing in the embodiment of the utility model is illustrated. Specifically, a boss 310 is extended laterally from the outer peripheral side of the first bearing 300 away from the annular body 210, and the free end 222 abuts against the boss 310. This makes it more stable when the free end 222 of the convex part 220 of the spring sheet 200 abuts against the first bearing 300, preventing the first bearing 300 from moving under the elastic force of the free end 222. While ensuring the shock absorption effect, the overall structure of the rotor connection structure 10 is more stable.

[0056] Furthermore, the free end 222 of the convex portion 220 extends with a bending angle 2221, and a portion of the bending angle 2221 abuts against the boss 310 of the first bearing 300. This prevents the boss 310 from being worn when the free end 222 abuts against the boss 310.

[0057] In some more preferred embodiments, a plurality of protrusions 220 are evenly spaced inside the annular body 210, and the plurality of protrusions 220 together form a limited area 230 at the center of the annular body 210. This makes the elastic force generated by the spring sheet 200 more uniform, further making the shock absorption effect brought by the spring sheet 200 better, thereby producing a better shock absorption effect on the motor.

[0058] Embodiment 2:

[0059] The difference between this embodiment and embodiment 1 is that this embodiment further optimizes the structure of the rotor connection structure 10 of the utility model. Figure 5 .

[0060] The first housing 100 is provided with an installation window 102 , the installation window 102 is connected to the installation cavity 101 , the first bearing 300 is installed in the installation window 102 , and the convex portion 220 of the spring sheet 200 protrudes toward the installation window 102 .

[0061] In this embodiment, since the first shell 100 is provided with an installation window 102, the protrusion 220 of the spring clip 200 can protrude into the installation window 102. While ensuring that the spring clip 200 achieves a shock-absorbing effect, since the protrusion 220 of the spring clip 200 protrudes toward the installation window 102, the space occupied by the spring clip 200 is smaller, and the space occupied by the overall structure of the motor is further smaller, and the structure is more compact, so that it can adapt to the installation of some equipment that can only accommodate small motors.

[0062] In some preferred embodiments, a bottom cover 400 is further included. The bottom cover 400 is connected to the side of the spring sheet 200 away from the first housing 100. The bottom cover 400 is provided with a mounting through hole 401, and the first bearing 300 is passed through the mounting through hole 401. The bottom cover 400 protects the spring sheet 200 and the first bearing 300, preventing the spring sheet 200 and the first bearing 300 from rubbing against external equipment, thereby causing wear. Moreover, the bottom cover 400 is provided with a mounting through hole 401 for the first bearing 300 to pass through, so that the first bearing 300 is flush with the bottom cover 400, and the bottom cover 400 and the spring sheet 200 are more closely fitted, further improving the compactness of the rotor connection structure 10.

[0063] Embodiment 3:

[0064] This embodiment provides a brushless motor 20 based on the above embodiment. Figure 6 .

[0065] A brushless motor 20 includes a second shell 500, a stator assembly 600, a rotor assembly 700, a second bearing 800 and a rotor connection structure 10. The interiors of the second shell 500 and the first shell 100 together form an installation cavity 101 for accommodating the stator assembly 600 and the rotor assembly 700. The rotor assembly 700 is inserted into the stator assembly 600, and the second bearing 800 is sleeved on one end of the rotor assembly 700 away from the first bearing 300.

[0066] The brushless motor 20 uses semiconductor switching devices to achieve electronic commutation, that is, electronic switching devices are used to replace traditional contact commutators and brushes. It has the advantages of high reliability, no commutation sparks, low mechanical noise, etc., and is widely used in high-end recorders, video recorders, electronic instruments, automated office equipment and industrial equipment.

[0067] In this embodiment, the stator assembly 600 is sleeved on the rotor assembly 700, and is installed together in the installation cavity 101 formed by the first housing 100 and the second housing 500. The first bearing 300 and the second bearing 800 are respectively sleeved on both ends of the rotor assembly 700. The first housing 100 and the second housing 500 protect the stator assembly 600 to prevent the stator assembly 600 from rubbing against external equipment when the motor is working, thereby causing the stator assembly 600 to wear and cause the motor to malfunction. The first bearing 300 and the second bearing 800 reduce the friction during the rotation of the rotor assembly 700, so that the rotor assembly 700 rotates more smoothly, thereby reducing energy consumption.

[0068] In some preferred embodiments, a top cover 900 is further included, and the top cover 900 is connected to a side of the second housing 500 away from the first housing 100. The top cover 900 is provided with a device through hole 901, and the second bearing 800 is fixed in the device through hole 901. The top cover 900 limits the second bearing 800, so that the second bearing 800 does not slide when the rotor assembly 700 rotates. Moreover, the top cover 900 also protects the second housing 500, and avoids the problem of the second housing being worn due to the second housing being scratched by external equipment.

[0069] In some more preferred embodiments, a gasket 1000 is further included, and the gasket 1000 is connected to the boss 310 of the first bearing 300, so that the rotor assembly 700 does not wear against the boss 310. The service life of the rotor assembly 700 and the first bearing 300 is improved, and the service life of the brushless motor 20 is further improved.

[0070] In the brushless motor 20 of the present invention, since the first bearing 300 is installed in the limiting area 230 of the spring sheet 200, the rotor assembly 700 is inserted into the first bearing 300, and the rotor assembly 700 is not in direct contact with the spring sheet 200. While the spring sheet 200 has a shock-absorbing effect, it does not generate friction with the rotor assembly 700, so that the rotor assembly 700 is subject to less resistance during rotation, thereby avoiding the problem that the provision of the spring sheet 200 and the gasket 1000 will generate greater resistance to the rotation of the rotor assembly 700, which may easily lead to a reduction in the motor speed, while also increasing the kinetic energy loss, which is not conducive to energy saving and environmental protection.

[0071] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0073] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0074] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0075] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A rotor connection structure, characterized in that: include: A first housing (100) having an installation cavity (101) formed therein for accommodating a rotor assembly (700); A spring piece (200) comprising an annular body (210) and a plurality of protrusions (220), wherein the annular body (210) is mounted on the bottom of the first shell (100), and the plurality of protrusions (220) are arranged at intervals inside the annular body (210) to form a limited position area (230) at the center of the annular body (210); and The first bearing (300) is used for being sleeved on the rotor assembly (700), the first bearing (300) being installed in the limiting area (230), and the plurality of protrusions (220) being in contact with the outer periphery of the first bearing (300) so that the first bearing (300) does not contact the first housing (100).

2. The rotor connection structure according to claim 1, characterized in that: The plurality of protrusions (220) comprise a connecting end (221) and a free end (222), wherein the connecting end (221) is connected to the annular body (210), and the free end (222) abuts against the first bearing (300).

3. The rotor connection structure according to claim 1, characterized in that: The convex portion (220) and the plane where the annular body (210) is located form an angle (223).

4. The rotor connection structure according to claim 2, characterized in that: A boss (310) is laterally extended from the outer peripheral side of the first bearing (300) away from the annular body (210), and the free end (222) abuts against the boss (310).

5. The rotor connection structure according to claim 1, characterized in that: The plurality of convex portions (220) are evenly spaced and arranged inside the annular body (210), and the plurality of convex portions (220) together form a limited position area (230) at the center of the annular body (210).

6. The rotor connection structure according to claim 1, characterized in that: The first housing (100) is provided with an installation window (102), the installation window (102) is connected to the installation cavity (101), the first bearing (300) is installed in the installation window (102), and the convex portion (220) of the spring sheet (200) protrudes toward the installation window (102).

7. The rotor connection structure according to claim 1, characterized in that: It also comprises a bottom cover (400), the bottom cover (400) being connected to a side of the spring sheet (200) away from the first housing (100), the bottom cover (400) being provided with a mounting through hole (401), and the first bearing (300) being passed through the mounting through hole (401).

8. A brushless motor, characterized in that: The invention comprises a second housing (500), a stator assembly (600), a rotor assembly (700), a second bearing (800), and a rotor connection structure (10) according to any one of claims 1 to 7, wherein the second housing (500) and the first housing (100) together form an installation cavity (101) for accommodating the stator assembly (600) and the rotor assembly (700), the rotor assembly (700) is inserted into the stator assembly (600), and the second bearing (800) is sleeved on an end of the rotor assembly (700) away from the first bearing (300).

9. The brushless motor according to claim 8, characterized in that: It also includes a top cover (900), the top cover (900) being connected to a side of the second shell (500) away from the first shell (100), the top cover (900) being provided with a device through hole (901), and the second bearing (800) being fixed in the device through hole (901).

10. The brushless motor according to claim 9, characterized in that: It also includes a gasket (1000), the gasket (1000) being connected to the boss (310) of the first bearing (300) so that the rotor assembly (700) does not wear against the boss (310).

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