Brushless linear motor

Abstract

According to the brushless linear motor, an opening is formed in the top of a body frame, and a mounting cavity is formed in the bottom of the body frame; the body cover is fixed at the opening; the motor is characterized in that the coil assembly comprises a winding support, a winding groove is formed in the upper portion of the winding support, a coil is wound in the winding groove, and the winding groove is arranged on the lower portion of the installation cavity; the bottom of the sliding assembly is provided with a pair of magnets with opposite magnetic poles, and the magnets are arranged in the upper part of the mounting cavity and above the coil assembly; and the fixing frame is arranged at the bottom of the mounting cavity and is mutually inserted and fixed with the bottom of the winding bracket, so that the structure is simple, the noise is low, the service life is long, the assembly is convenient, and the manufacturing cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of brushless motors, and in particular to a brushless linear motor. Background Art

[0002] Hairdressing tools for small household appliances generally include motor components, circuit board components and the main body of the machine. The motors currently used in hairdressing tools mainly use rotor brush motors or ordinary brushless linear motors to drive the blades to move back and forth quickly, thereby achieving hair cutting. Due to the limitations of usage scenarios and product structure space, this type of motor needs to meet the characteristics of small size, high power, low noise, good heat dissipation, and long service life. However, most of the existing rotor brush motors used for power tools such as hairdressing tools can only meet the characteristics of relatively small size and low noise. It is difficult to achieve high power and long life on the basis of small size. Therefore, how to improve the output stable power and extend the life of the brushless linear motor on the basis of small size is still a difficult problem that needs to be solved urgently. Therefore, after consideration, we have made further breakthrough designs for the existing brushless linear motors.

[0003] Upon investigation, patent number CN202311059905.1 discloses a brushless DC motor and a method for operating a brushless DC motor. The brushless DC motor includes a housing and four rotor magnets on the inside of the housing. The four rotor magnets are placed on the inside of the housing in an alternating pattern of N poles and S poles. A stator magnetic steel sheet is provided at the center of the four rotor magnets. The present invention protects the brushless DC motor by a ring frame and a cover plate to prevent external components from directly impacting the inside of the brushless DC motor. When external components impact the surface of the rotating rubber swivel, the rotating rubber swivel can rotate and offset the impact force of the component, reducing the impact force of the component on the ring frame. The stretched rubber swivel and the elastic sleeve can further absorb the impact force of the component, preventing the impact force of the component from acting on the outer side of the housing, thereby improving the protection capability of the brushless DC motor. However, the structure is complex, and as the service life decreases, the stability and stability will also decrease. Therefore, the market needs a motor with a simple structure, long service life, and not easy to damage. Summary of the Invention

[0004] The present invention mainly aims at solving the problems in the prior art and proposes a brushless linear motor with a simple structure, low noise, long service life, easy assembly and low manufacturing cost.

[0005] The technical solution of the present invention is: a brushless linear motor, comprising:

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

[0007] a body cover fixed at the opening;

[0008] Its characteristics are:

[0009] A coil assembly includes a winding bracket, the upper portion of which is provided with a winding groove, the winding groove being wound with a coil, and the coil assembly is arranged in the lower portion of the mounting cavity;

[0010] A sliding assembly, having a magnet at the bottom, and arranged in the upper portion of the mounting cavity above the coil assembly via a guide hole and a positioning shaft matching structure;

[0011] An iron core fixing frame is arranged at the bottom of the installation cavity and is plugged and fixed to the winding bracket.

[0012] Furthermore, the bottom of the main body frame is provided with a fixing groove, and the bottom of the corresponding fixing frame matches it to achieve plug-in fixation.

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

[0014] Furthermore, the sliding assembly includes a magnet fixing frame, which is laterally provided with a guide hole, through which the positioning shaft passes, and a corresponding mounting slot is provided on the top of the main frame to match the shaft end of the positioning shaft to achieve installation and fixation.

[0015] Furthermore, the two ends of the positioning shaft are respectively covered with return springs and bearings to achieve elastic return function.

[0016] Furthermore, the sliding assembly has a magnet fixing frame, a hollow seat body is provided on the top of the magnet fixing frame, the hollow seat body is clamped with the cutter head fixing sleeve, and a cutter head shaft is provided in the seat body and the cutter head fixing sleeve.

[0017] Furthermore, a pair of fixing holes is provided on the top of the main body cover, and correspondingly, at least a pair of screw holes is provided on the top of the main body frame. The screws pass through the fixing holes and are screwed into the screw holes to fix the main body cover and the main body frame.

[0018] Furthermore, the front and rear ends of the magnet fixing frame are provided with raised positioning parts, which match the inner wall of the main body frame to achieve the positioning function.

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

[0020] Finally, the sliding components are preferably in two groups and are distributed front and back in the fixed installation cavity through their respective positioning axes, and magnets are embedded at the bottom of the magnet fixing frames of the front and rear sliding components, and their magnetic poles are opposite.

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

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

[0023] 2. The application improves the problem of jamming and sound disorder caused by the difficulty in injection molding and easy deformation when the linear motor is connected with a sheet.

[0024] 3. The magnet of the front and back sliding assembly is arranged oppositely, and the front and back sliding assemblies slide oppositely respectively, so that the balance is better and the stability is higher.

[0025] 4. The application has simple structure assembly requirement, large transmission power, stable output and long service life. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Fig. 1 is a perspective view of embodiment 1 of the application,

[0027] Figure 2 Fig. 2 is a perspective view of an iron core fixing frame,

[0028] Figure 3 Fig. 3 is a sectional view of embodiment 1 of the application,

[0029] Figure 4 Fig. 4 is another angle sectional view of embodiment 1 of the application,

[0030] Figure 5 Fig. 5 is an exploded structural view of embodiment 1 of the application (single shaft),

[0031] Figure 6 Fig. 6 is a perspective view of embodiment 2 of the application,

[0032] Figure 7 Fig. 7 is another angle exploded structural view of embodiment 2 of the application (double shaft),

[0033] Figure 8 Fig. 8 is a perspective view of embodiment 3 of the application,

[0034] Figure 9 Fig. 9 is another angle exploded structural view of embodiment 3 of the application (double shaft),

[0035] In the figure, 1 is a body frame, 2 is a mounting cavity, 3 is a body cover, 4 is a coil assembly, 5 is a sliding assembly, 6 is a copper coil, 7 is a magnet, 8 is an iron core fixing frame, 9 is a fixing groove, 10 is a protruding positioning part, 11 is a guide hole, 12 is a positioning shaft, 13 is a mounting groove hole, 14 is a reset spring, 15 is a powder metallurgy bearing, 16 is a seat body, 17 is a cutter head shaft, 18 is a rectangular window, 19 is a screw, 20 is a screw hole, 21 is a cutter head fixing sleeve, 22 is a magnet fixing frame, 23 is a U-shaped connecting seat, 24 is a cutter head spring, 25 is a cutter head spring fixing block, and 26 is a middle cutter head connecting piece. DETAILED DESCRIPTION

[0036] The following is a further detailed description of the implementation methods of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention 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 invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0037] In the description of this patent, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this patent based on the specific circumstances.

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

[0039] Example 1

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

[0041] The bottom of the main body frame 1 preferably has an H-shaped fixing groove 9, which matches the bottom of the corresponding core fixing frame 8 to achieve plug-in fixation. The core fixing frame 8 has an "E"-shaped cross-section and is made of silicon steel, with a central column. The corresponding winding bracket 5 is a hollow sleeve that is plugged and fixed to the column of the core fixing frame 8. In this brushless linear motor, when energized, the copper coil 6 in the coil assembly 4 causes the silicon steel core fixing frame 8 and its coil 6 to form alternating magnetic poles. Through interaction with the magnet 7, this promotes the sliding assembly 5 to slide back and forth relative to the coil assembly 4, thereby generating a high-frequency vibration output from the sliding assembly 5.

[0042] Depending on customer needs, the sliding assembly 5 can be arranged in two parallel groups within the mounting cavity 2, or a single group can be located within the mounting cavity 2. In this embodiment, a single sliding assembly 5 is used. The sliding assembly 5 includes a magnet mount 22, which is provided with a guide hole 11 extending through the core mount 22, through which the positioning shaft 12 is secured. Correspondingly, the top of the main body 1 is provided with a mounting slot 13 that mates with the end of the positioning shaft 12 for secure installation. Return springs 14 and powder metallurgy bearings 15 are positioned on either end of the positioning shaft 12, respectively, to elastically return the core mount 8 to its left and right ends. The powder metallurgy bearings 15 on the positioning shaft 12 reduce wear on the positioning shaft 12 during left-right sliding. The symmetrically distributed return springs 14 adjust the left-right swing distance and provide shock absorption. The sliding assembly 5 includes a magnet mount 22, topped with a hollow base 16. A cutter head retaining sleeve 21 is secured to the base 16, and a cutter head shaft 17 is positioned within the base 16 and the base 16. According to customer needs, there are preferably two or three cutter head shafts 17, and the cutter head shafts 17 drive the blades to slide back and forth quickly to achieve fast shaving. At least one rectangular window 18 is provided on the top of the main body cover 3. The number of rectangular windows 18 matches the number of sliding components 5, so that the cutter head fixing sleeve 21 and the cutter head shaft 17 of the core fixing frame 8 are exposed. This embodiment uses a hollow seat body 16 with a cutter head shaft 17 inserted in the middle. The front and rear ends of the core fixing frame 8 are provided with raised positioning parts 10, which are clearance-matched with the two sides of the main body frame 1 to play a balancing role when sliding. The raised positioning part 10 is preferably in a partial spherical shape. As Figure 5 In this embodiment, the sliding assembly 5 adopts a group and is distributed in the rectangular window 18 in the fixed installation cavity 2 through the positioning shaft 12. A group of magnets 7 are embedded at the bottom of the magnet fixing frame 22 of the sliding assembly 5. In this way, under the action of the alternating magnetic field, the sliding assembly 5 can slide back and forth under the force of the magnetic field.

[0043] Finally, a pair of fixing holes 11 are provided on the top of the main body cover 3, and correspondingly, at least a pair of screw holes 20 are provided on the top of the main body frame 1. The screws 19 pass through the fixing holes 11 and are 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 divided into two groups, and are distributed front and back in the rectangular window 18 in the fixed installation cavity 2 through their respective positioning shafts 12. The rectangular window 18 is also divided into two, front and back. The sliding component 5 is 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 embedded with a group of magnets 7, and 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 respectively, thereby having better balance and higher stability.

[0046] Other details are the same as those in Example 1.

[0047] Example 3

[0048] like Figures 8-9 , similar to embodiment example 2, it is mainly reflected in the different cutter head connection structure at the top of the sliding component 5. There is a U-shaped connecting seat 23 at the top of the sliding component 5. The middle of the U-shaped connecting seat 23 is a socket for inserting the positioning shaft 12. The positioning shaft 12 is covered with a cutter head spring 24, and then the cutter head spring fixing block 25 can be slid up and down and clamped on the U-shaped connecting seat 23. There is also an intermediate cutter head connector 26 clamped on the sliding component 5.

Claims

1. A brushless linear motor comprising: A main frame having an opening at the top and a mounting cavity at the bottom; a body cover fixed at the opening; Its characteristics are: A coil assembly includes a winding bracket, the upper portion of which is provided with a winding groove, the winding groove being wound with a coil, and the coil assembly is arranged in the lower portion of the mounting cavity; A sliding assembly, having a magnet at the bottom, and arranged in the upper portion of the mounting cavity above the coil assembly via a guide hole and a positioning shaft matching structure; An iron core fixing frame is arranged at the bottom of the installation cavity and is plugged and fixed to the winding bracket.

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

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

4. A brushless linear motor according to claim 1, characterized in that The sliding assembly includes a magnet fixing frame, which is laterally provided with a guide hole, through which the positioning shaft passes. The top of the corresponding main frame is provided with a mounting slot hole that matches the shaft end of the positioning shaft to achieve installation and fixation.

5. A brushless linear motor according to claim 4, characterized in that The two ends of the positioning shaft are covered with return springs and bearings in sequence to achieve elastic return function.

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

7. The brushless linear motor according to claim 1, characterized in that The top of the body cover is provided with a pair of fixing holes, and the top of the corresponding body frame is provided with at least a pair of screw holes. The screws pass through the fixing holes and are screwed into the screw holes to achieve the fixation of the body cover and the body frame.

8. The brushless linear motor according to claim 6, characterized in that The front and rear ends of the magnet fixing frame are provided with raised positioning parts, which match the inner wall of the body frame to achieve the positioning function.

9. The brushless linear motor according to claim 8, characterized in that The top of the main body cover is provided with at least one rectangular window for exposing the seat body, the cutter head fixing sleeve and the cutter head shaft on the magnet fixing frame.

10. The brushless linear motor according to claim 9, characterized in that The sliding components are preferably in two groups and are distributed front and back in the fixed installation cavity through their respective positioning shafts, and magnets are embedded at the bottom of the magnet fixing frames of the front and rear sliding components, and their magnetic poles are opposite.

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