Brushless linear motor

Abstract

A brushless linear motor includes: an opening at the top of a body frame and a mounting cavity at the bottom; a body cover fixed to the opening; characterized in that: the coil assembly includes a winding bracket, the upper part of the winding bracket has a winding groove, a coil is wound in the winding groove and arranged in the lower part of the mounting cavity; the bottom of the sliding assembly has a pair of magnets with opposite magnetic poles, located in the upper part of the mounting cavity, above the coil assembly; a fixed bracket is mounted on the bottom of the mounting cavity and is interlocked with the bottom of the winding bracket for fixation. It has a simple structure, low noise, long service life, convenient assembly, and low manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, and in particular to a brushless linear motor. Background Technology

[0002] With continuous economic development and social progress, a wealth of consumer goods has been provided, creating favorable conditions for improving people's living standards and pursuing personalized lifestyles. Small household hair-cutting appliances generally include a motor assembly, a circuit board assembly, and the main body. Currently, the motors used in hair-cutting appliances mainly employ rotor brush motors or ordinary brushless linear motors to drive the blades in rapid reciprocating motion, thereby achieving hair cutting. Due to the limitations of usage scenarios and product structure space, these motors need to meet characteristics such as small size, high power, low noise, good heat dissipation, and long service life. However, most existing rotor brush motors used in hair-cutting appliances and other power tools can only meet the characteristics of relatively small size and low noise, making it difficult to achieve high power and long service life while maintaining a small size. Therefore, how to improve the output stability and extend the lifespan of brushless linear motors while maintaining a small size remains an urgent problem to be solved. Therefore, after consideration, we have made further breakthrough designs on existing brushless linear motors.

[0003] A search revealed that patent number CN202311059905.1 discloses a brushless DC motor and a method for operating the brushless DC motor. This brushless DC motor includes a housing and four rotor magnets located inside the housing. The four rotor magnets are positioned inside the housing with alternating N and S poles, and stator magnets are located at the center of each of the four rotor magnets. This invention protects the brushless DC motor through a ring frame and cover plate, preventing external components from directly impacting the motor's interior. When external components impact the surface of the rotating rubber ring, the rotating rubber ring can deflect the impact force, reducing the impact force on the ring frame. Furthermore, the taut rubber ring and elastic sleeve can further absorb the impact force, preventing it from acting on the outer surface of the housing, thus improving the protection of the brushless DC motor. However, the structure is complex, and its stability decreases with reduced service life. Therefore, the market needs a motor with a simple structure, long service life, and resistance to damage. Summary of the Invention

[0004] This utility model addresses the problems of existing technologies by proposing a brushless linear motor with simple structure, low noise, long service life, easy assembly, and low manufacturing cost.

[0005] The technical solution of this utility model is: a brushless linear motor, comprising:

[0006] A frame with an opening at the top and a mounting cavity at the bottom;

[0007] A main cover is fixed at the opening;

[0008] Its features are:

[0009] A coil assembly includes a winding bracket, a winding groove on the upper part of the winding bracket, a coil wound in the winding groove, and arranged in the lower part of the mounting cavity.

[0010] A sliding component has a magnet at its bottom and is positioned in the upper part of the mounting cavity, above the coil component, through a guide hole and a positioning shaft.

[0011] A core fixing bracket is located at the bottom of the mounting cavity and is plugged into and fixed to the winding bracket.

[0012] Furthermore, the bottom of the main frame has a fixing groove, and the bottom of the corresponding fixing frame matches it to achieve plug-in fixing.

[0013] Furthermore, the core fixing frame has a column, and the corresponding winding bracket is a hollow sleeve that is inserted into the column of the core fixing frame.

[0014] Furthermore, the sliding component includes a magnet fixing bracket with a guide hole in the horizontal direction. The positioning shaft passes through the guide hole, and the top of the corresponding body frame has a mounting slot that matches the shaft end of the positioning shaft to achieve installation and fixation.

[0015] Furthermore, a return spring and a bearing are sequentially fitted around both ends of the positioning shaft to achieve an elastic reset function.

[0016] Furthermore, the sliding assembly has a magnet fixing bracket, the top of which is provided with a hollow seat, which is engaged with a cutter head fixing sleeve, and a cutter head shaft is provided inside the seat and the cutter head fixing sleeve.

[0017] Furthermore, the top of the main body cover is provided with a pair of fixing holes, and the top of the corresponding main body frame is provided with at least a pair of screw holes. The screw passes through the fixing holes and is screwed into the screw holes to fix the main body cover and the main body frame.

[0018] Furthermore, the magnet fixing frame has protruding positioning parts at both the front and rear ends, which match the inner wall of the main frame to achieve the positioning function.

[0019] Furthermore, the top of the main body cover is provided with at least one rectangular window to expose the base, cutter head fixing sleeve and cutter head shaft on the magnet fixing bracket.

[0020] Finally, the sliding components are preferably two sets distributed in the mounting cavity in front and behind each other through their respective positioning shafts, and magnets are embedded at the bottom of the magnet fixing brackets of the front and rear sliding components, with their magnetic poles being opposite.

[0021] Compared with existing technologies, the technical advantages of this product are:

[0022] 1. Solve the problems of poor stability, short lifespan, and low power of current rotor brush motors;

[0023] 2. Improve the problems of jamming and noisy noise caused by injection molding difficulties and easy deformation when using thin sheet connections for linear motors;

[0024] 3. The magnets of the front and rear sliding components are arranged with opposite magnetic poles, so that the front and rear sliding components slide in opposite directions, resulting in better balance and higher stability.

[0025] 4. The structure of this application has simple assembly requirements, large power transmission, stable output, and long service life. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of Embodiment 1 of the present invention.

[0027] Figure 2 This is a three-dimensional schematic diagram of the iron core fixing frame.

[0028] Figure 3 This is a cross-sectional view of Embodiment 1 of the present invention.

[0029] Figure 4 This is a cross-sectional view from another angle of Embodiment 1 of this utility model.

[0030] Figure 5 This is a schematic diagram of the exploded structure (single axis) of Embodiment 1 of this utility model.

[0031] Figure 6 This is a three-dimensional schematic diagram of Embodiment 2 of the present invention.

[0032] Figure 7 This is a schematic diagram of the exploded structure from another angle (dual axis) of Embodiment 2 of this utility model.

[0033] Figure 8 This is a three-dimensional schematic diagram of Embodiment 3 of the present invention.

[0034] Figure 9 This is a schematic diagram of the exploded structure from another angle (dual axis) of Embodiment 3 of this utility model.

[0035] In the diagram, 1. Main body frame, 2. Mounting cavity, 3. Main body cover, 4. Coil assembly, 5. Sliding assembly, 6. Copper coil, 7. Magnet, 8. Iron core fixing bracket, 9. Fixing groove, 10. Protruding positioning part, 11. Guide hole, 12. Positioning shaft, 13. Mounting slot hole, 14. Return spring, 15. Powder metallurgy bearing, 16. Seat, 17. Cutter head shaft, 18. Rectangular window, 19. Screw, 20. Screw hole, 21. Cutter head fixing sleeve, 22. Magnet fixing bracket, 23. U-shaped connecting seat, 24. Cutter head spring, 25. Cutter head spring fixing block, 26. Intermediate cutter head connector. Detailed Implementation

[0036] The embodiments of this utility model patent will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model patent, but should not be construed as limiting its scope. In the description of this utility model patent, unless otherwise stated, "multiple" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model patent 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, and therefore should not be construed as a limitation on this utility model patent. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this utility model patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model patent based on the specific circumstances.

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0039] Example 1

[0040] like Figures 1 to 5A brushless linear motor includes main components such as a body frame 1, a coil assembly 4, and a sliding assembly 5. The body frame 1 has an opening at the top and a mounting cavity 2 at the bottom, with a body cover 3 fixed to the opening. The coil assembly 4 includes a winding bracket with a winding groove at the top, in which a copper coil 6 is wound and arranged at the bottom of the mounting cavity 2. The sliding assembly 5 has a set of magnets 7 at the bottom, located in the upper part of the mounting cavity 2, above the coil assembly 4. A core fixing bracket 8 is located at the bottom of the mounting cavity 2 and is inserted and fixed to the bottom of the winding bracket.

[0041] The bottom of the main frame 1 is preferably an H-shaped fixing groove 9, and the bottom of the corresponding iron core fixing frame 8 matches it to achieve plug-in fixation. The cross-section of the iron core fixing frame 8 is "E" shaped and made of silicon steel, with a column in the middle. The corresponding winding bracket 5 is a hollow sleeve that is plugged into and fixed to the column of the iron core fixing frame 8. In this brushless linear motor, after the copper coil 6 in the coil assembly 4 is energized, it causes the silicon steel iron core fixing frame 8 and its coil 6 to form alternating magnetic poles. Under the interaction with the magnet 7, this drives the sliding assembly 5 to reciprocate relative to the coil assembly 4, thereby causing the sliding assembly 5 to generate high-frequency vibration output.

[0042] According to customer requirements, the sliding components 5 are preferably two sets arranged side by side in the mounting cavity 2, or a single set of sliding components 5 is distributed in the mounting cavity 2. In this embodiment, a single set of sliding components 5 is used. The sliding component 5 includes a magnet fixing frame 22, and the iron core fixing frame 22 is provided with a guide hole 11. The positioning shaft 12 passes through the guide hole 11 and is fixed. Correspondingly, the top of the corresponding body frame 1 is provided with a mounting slot 13 that matches the shaft end of the positioning shaft 12 to achieve installation and fixation. The two ends of the positioning shaft 12 are successively fitted with a return spring 14 and a powder metallurgy bearing 15 to realize the elastic return function of the left and right ends of the iron core fixing frame 8. The powder metallurgy bearing 15 provided on the positioning shaft 12 is used to reduce the wear of the positioning shaft 12 when sliding left and right. The return springs 14 symmetrically distributed on both sides are used to adjust the left and right swing distance and damping. The sliding component 5 has a magnet fixing frame 22. The top of the magnet fixing frame 22 is provided with a hollow seat 16. A cutter head fixing sleeve 21 is snapped on the seat 16. A cutter head shaft 17 is provided inside the seat 16 and the cutter head fixing sleeve 21. According to customer requirements, the cutter head shaft 17 is preferably two or three, which drive the blades to slide back and forth rapidly, thereby achieving fast shaving. The top of the body cover 3 has at least one rectangular window 18, the number of which matches the number of sliding components 5, exposing the cutter head fixing sleeve 21 and the cutter head shaft 17 of the iron core fixing frame 8. In this embodiment, a hollow base 16 is used, with a cutter head shaft 17 inserted in the middle. The front and rear ends of the iron core fixing frame 8 are provided with protruding positioning parts 10, which are clearance-fitted with the sides of the body frame 1, providing balance during sliding. The protruding positioning parts 10 are preferably partially spherical in shape. Figure 5 In this embodiment, a set of sliding components 5 are distributed in the rectangular window 18 in the mounting cavity 2 via the positioning shaft 12. A set of magnets 7 are embedded at the bottom of the magnet fixing frame 22 of the sliding components 5. In this way, under the action of the alternating magnetic field, the sliding components 5 can slide back and forth under the action of the magnetic field force.

[0043] Finally, the top of the main body cover 3 is provided with a pair of fixing holes 11, and the top of the corresponding main body frame 1 is provided with at least a pair of screw holes 20. The screw 19 passes through the fixing holes 11 and is screwed into the screw holes 20. Preferably, there are two pairs of fixing holes 11 and two pairs of screw holes 20 to fix the main body cover 3 and the main body frame 1.

[0044] Example 2

[0045] like Figures 6-7 In a preferred embodiment, the sliding components 5 are preferably two sets, and are distributed in the rectangular window 18 in the mounting cavity 2 through their respective positioning shafts 12. The rectangular window 18 is also divided into front and rear parts. The sliding components 5 are divided into a front sliding component and a rear sliding component. The bottom magnet fixing frame 22 of the front sliding component and the rear sliding component are each embedded with a set of magnets 7. The magnetic poles of the magnets 7 of the front sliding component and the rear sliding component are arranged in opposite directions. In this way, under the action of the same alternating magnetic field, the front sliding component and the rear sliding component slide in opposite directions, thereby achieving better balance and higher stability.

[0046] Everything else is the same as in Example 1.

[0047] Example 3

[0048] like Figures 8-9 Similar to Example 2, the main difference lies in the top blade connection structure of the sliding component 5. The top of the sliding component 5 has a U-shaped connecting seat 23, with a hole for inserting the positioning shaft 12 in the middle. A blade spring 24 is sleeved on the positioning shaft 12, and the blade spring fixing block 25 can slide up and down and be engaged with the U-shaped connecting seat 23. In addition, the middle blade connector 26 is engaged with the sliding component 5.

Claims

1. A brushless linear motor, comprising: A frame with an opening at the top and a mounting cavity at the bottom; A main cover is fixed at the opening; Its features are: A coil assembly includes a winding bracket, a winding groove on the upper part of the winding bracket, a coil wound in the winding groove, and arranged in the lower part of the mounting cavity. A sliding component has a magnet at its bottom and is positioned in the upper part of the mounting cavity, above the coil component, through a guide hole and a positioning shaft. A core fixing bracket is located at the bottom of the mounting cavity and is plugged into and fixed to the winding bracket.

2. A brushless linear motor according to claim 1, characterized in that The bottom of the main frame has a fixing groove, and the bottom of the corresponding fixing frame matches it to achieve plug-in fixing.

3. A brushless linear motor according to claim 1, characterized in that The core fixing frame has a column, and the corresponding winding bracket is a hollow sleeve that is inserted into the column of the core fixing frame.

4. A brushless linear motor according to claim 1, characterized in that The sliding component includes a magnet mounting bracket with a guide hole in the horizontal direction. The positioning shaft passes through the guide hole, and the top of the corresponding body frame has a mounting slot that matches the end of the positioning shaft to achieve installation and fixation.

5. A brushless linear motor according to claim 4, characterized in that The positioning shaft is fitted with a return spring and a bearing at each end to achieve the elastic reset function.

6. A brushless linear motor according to claim 1, characterized in that The sliding assembly has a magnet fixing frame, and a hollow seat is provided on the top of the magnet fixing frame. The hollow seat is engaged with the cutter head fixing sleeve, and a cutter head shaft is provided inside the seat and the cutter head fixing sleeve.

7. A brushless linear motor according to claim 1, characterized in that The top of the main body cover is provided with a pair of fixing holes, and the top of the corresponding main body frame is provided with at least a pair of screw holes. The screw passes through the fixing holes and is screwed into the screw holes to fix the main body cover and the main body frame.

8. A brushless linear motor according to claim 6, characterized in that The magnet holder has raised positioning parts at both the front and rear ends, which match the inner wall of the main body frame to achieve the positioning function.

9. A brushless linear motor according to claim 8, characterised in that The top of the main body cover has at least one rectangular window to expose the base, cutter head fixing sleeve and cutter head shaft on the magnet fixing bracket.

10. A brushless linear motor according to claim 9, characterized in that The sliding components are in two sets, distributed front and back in the mounting cavity through their respective positioning shafts, and magnets are embedded at the bottom of the magnet fixing brackets of the front and back sliding components, with their magnetic poles being opposite.

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