Brushless direct current motor with tooth riveting structure

Abstract

The invention relates to the technical field of brushless direct current motors, in particular to a brushless direct current motor with a tooth riveting structure, which comprises a shell, a yoke main magnetic circuit module and an insulating framework, the yoke main magnetic circuit module is embedded in the shell, the yoke main magnetic circuit module comprises a main body, a plurality of connecting plates, a slot and a riveting part, the main body is fixedly connected with the inner wall of the shell, the overall appearance of the main body is in a circular ring shape, the connecting plates are uniformly distributed on the inner wall of the main body, and the riveting part is arranged in the slot. The interior of the main body is divided by a connecting plate to form slots; the riveting part is arranged on the outer wall of one end, far away from the main body, of the connecting plate; by improving the brushless direct current motor with the tooth riveting structure, the brushless direct current motor has the advantages that the structural design is reasonable, the concentric circle precision of the stator assembly is high, the energy density is high, the winding production efficiency is high, the cogging torque can be weakened, and the noise reduction and shockproof effects are achieved, so that the problems and defects in the prior art and equipment are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of brushless DC motors, and more specifically, to a brushless DC motor with a riveted tooth structure. Background Art

[0002] The working principle of the brushless DC motor is based on the law of electromagnetic induction. It uses an electronic controller (also called an electronic commutator) to control the direction of the current in the motor winding, thereby changing the direction of the motor's magnetic field to make the rotor rotate continuously. Compared with traditional brushed DC motors, brushless DC motors do not use physical brushes and commutators, but instead use electronic controllers to achieve commutation functions.

[0003] The brushless DC motors currently available on the market can be divided into two types according to their structure: straight-bar type and inner-winding type. Both structures have many defects:

[0004] The straight strip type currently has the following defects: 1) It is difficult to ensure the precision of the concentric circles after coiling and welding; 2) The equipment investment is large, especially the winding equipment; 3) The requirements for the core mold are extremely high, and the equipment needs frequent maintenance;

[0005] The inner winding type currently has the following defects: 1) low production efficiency; 2) high production cost; 3) low degree of automation.

[0006] In view of this, research and improvement are conducted on the existing problems, and a brushless DC motor with a riveted tooth structure is provided, aiming to solve the problem and improve the practical value through this technology. Summary of the invention

[0007] The object of the present invention is to provide a brushless DC motor with a riveted tooth structure to solve the problems and shortcomings raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides a brushless DC motor with a riveted tooth structure, which is achieved by the following specific technical means:

[0009] A brushless DC motor with a tooth riveting structure comprises: a housing, a yoke main magnetic circuit module, an insulating frame, a winding group, a pin, a PCB board, a combined module, a rotor assembly, and a rotor shaft; the yoke main magnetic circuit module is embedded and installed inside the housing, and the yoke main magnetic circuit module comprises a main body, a connecting plate, a slot and a riveting part, wherein the main body is fixedly connected to the inner wall of the housing, and the overall appearance of the main body is annular, a plurality of connecting plates are evenly distributed on the inner wall of the main body, and the interior of the main body is divided by the connecting plate to form a slot; the riveting part is arranged on the outer wall of the connecting plate away from one end of the main body; the insulating frame is plugged and installed in the slot, and the winding group is wound on the insulating frame; the PCB board is arranged at the bottom of the insulating frame, and the PCB board is connected to the PCB board through the pins at the bottom; the combined module comprises a fixed assembly and a combined module, wherein the combined module is embedded and installed on the inner side of the fixed assembly, and the combined module is fixed by riveting to the riveting part; the rotor assembly is embedded and installed inside the combined module, and the rotor shaft is fixedly arranged at the middle position of the rotor assembly.

[0010] As a further optimization of the present technical solution, the present invention provides a brushless DC motor with a tooth riveted structure, wherein the combined module includes a closed magnetic circuit connection module and an open magnetic circuit connection module, and the closed magnetic circuit connection module and the open magnetic circuit connection module are stacked in multiple layers, and the two are staggered, and the closed magnetic circuit connection module is located on the upper and lower sides of the open magnetic circuit connection module.

[0011] As a further optimization of the technical solution, in a brushless DC motor with a riveted tooth structure according to the present invention, the outer walls of the closed magnetic circuit connection module and the open magnetic circuit connection module are both provided with dovetail tenons for accommodating the riveted parts, and cut-surface oblique grooves are provided at the edges on both sides of the dovetail tenon opening.

[0012] As a further optimization of the technical solution, the fixing assembly of the brushless DC motor with a tooth riveted structure of the present invention is provided with a plurality of evenly distributed notches around the periphery, and the riveted portion penetrates through the notches and is fixedly engaged with the dovetail tenon.

[0013] As a further optimization of the technical solution, the present invention provides a brushless DC motor with a tooth riveted structure, wherein the rotor assembly includes a fixed block, an outer rotor core module, a magnetic tile, an inner rotor core module and a shock-absorbing module, wherein the fixed block is installed at the center position of the combined module, and the outer rotor core module is embedded and installed on the inner side of the fixed block; the magnetic tile is plug-in installed around the outer rotor core module, and the inner rotor core module is plug-in installed at the center position of the outer rotor core module, and a shock-absorbing module is arranged between the inner rotor core module and the outer rotor core module.

[0014] As a further optimization of the technical solution, a brushless DC motor with a tooth riveted structure of the present invention has a plurality of evenly distributed installation grooves for installing magnetic tiles on the four edges of the outer rotor core module, and the end of the installation groove away from the center of the outer rotor core module penetrates the outer wall of the outer rotor core module, the width of the through opening is smaller than the width of the magnetic tile, and two opposite half-open magnetic circuit grooves are opened on two opposite side walls near the opening end of the installation groove.

[0015] As a further optimization of the technical solution, in the brushless DC motor with a riveted tooth structure of the present invention, the outer edge of the outer rotor core module is composed of a plurality of non-concentric eccentric circles in a top view.

[0016] As a further optimization of the technical solution, a brushless DC motor with a riveted tooth structure of the present invention has a circular hole for installing the inner rotor core module in the middle position of the outer rotor core module, and twelve evenly distributed semicircular grooves in a top view are provided on the inner wall of the circular hole.

[0017] As a further optimization of the technical solution, in a brushless DC motor with a riveted tooth structure of the present invention, a semicircular protrusion corresponding to the groove on the inner wall of the outer rotor core module is provided on the outer wall of the inner rotor core module.

[0018] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0019] 1. The combined module of the present invention is embedded and installed on the inner side of the fixed component, and the combined module is fixed to the riveting part by riveting, and the outer walls of the closed magnetic circuit connection module and the open magnetic circuit connection module are provided with dovetail tenons for accommodating the riveting part, and a plurality of evenly distributed notches are provided around the fixed component, and the riveting part penetrates the notches and is fixed by clamping with the dovetail tenons, and the closed magnetic circuit connection module and the open magnetic circuit connection module are combined by the fixed component to form a whole, which is pressure-resistant and does not deform, thereby ensuring that the overall concentric circles after riveting are within the control requirements, and the structure after riveting is firm and mechanical strength is high, and the stator magnetic field efficiency is high and the slot filling rate is high, thereby reducing the empty space inside the motor, optimizing the motor howling, and enhancing the electric field strength.

[0020] 2. In the present invention, the edges on both sides of the dovetail tenon opening are provided with cut surface oblique grooves. The outer edge of the outer rotor core module is composed of multiple non-concentric eccentric circles in a top view. Two opposite half-open magnetic circuit grooves are provided on two opposite side walls near the opening end of the mounting groove. The purpose of the auxiliary cut surface oblique grooves is to reduce the main harmonic components. The eccentric circles on the outer rotor core module help to weaken the toothing torque, and the half-open magnetic circuit grooves have noise reduction and anti-vibration functions, so that the stator and rotor punching sheets help to weaken the toothing torque and have noise reduction and shockproof effects.

[0021] 3. A circular hole for installing the inner rotor core module is provided in the middle position of the outer rotor core module of the present invention, and twelve evenly distributed semicircular grooves in a top view are provided on the inner wall of the circular hole. A semicircular protrusion in a top view corresponding to the grooves on the inner wall of the outer rotor core module is provided on the outer wall of the inner rotor core module. A shock absorbing module is provided between the inner rotor core module and the outer rotor core module. The inner rotor core module and the outer rotor core module are connected by the shock absorbing module, so that the rotor can achieve a shock absorbing effect, thereby optimizing and improving vibration, while improving the stability of the whole machine and improving product quality.

[0022] 4. The present invention improves the brushless DC motor with a riveted tooth structure, and has the advantages of reasonable structural design, high precision of the concentric circles of the stator assembly, high energy density, high winding production efficiency, and helps to weaken the tooth slot torque and reduce noise and shockproof effects, thereby effectively solving the problems and shortcomings in the existing technology and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the internal explosion structure of the present invention;

[0027] Figure 4 It is a schematic diagram of the exploded structure of the main magnetic circuit module of the yoke of the present invention;

[0028] Figure 5 It is a schematic diagram of the top view of the main magnetic circuit module of the yoke of the present invention;

[0029] Figure 6 It is a schematic diagram of the explosion structure of the combined module of the present invention;

[0030] Figure 7 It is a schematic diagram of the explosion structure of the fixing block of the present invention;

[0031] Figure 8 It is a schematic diagram of the structure of the outer rotor core module of the present invention.

[0032] In the figure: housing 1, yoke main magnetic circuit module 2, main body 2.1, connecting plate 2.2, slot 2.3, riveting part 2.4, insulating skeleton 3, winding group 4, pin 5, PCB board 6, combined module 7, fixing component 7.1, combined module 7.2, closed magnetic circuit connection module 7.21, open magnetic circuit connection module 7.22, dovetail tenon 7.23, rotor assembly 8, fixing block 9, outer rotor core module 10, mounting slot 101, semi-open magnetic circuit slot 102, magnetic tile 11, inner rotor core module 12, damping module 13, rotor shaft 14. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] See also Figures 1 to 8 The present invention provides a specific technical implementation scheme of a brushless DC motor with a riveted tooth structure:

[0035] A brushless DC motor with a tooth riveting structure comprises: a housing 1, a yoke main magnetic circuit module 2, an insulating skeleton 3, a winding group 4, a pin 5, a PCB board 6, a combination module 7, a rotor assembly 8, and a rotor shaft 14; the yoke main magnetic circuit module 2 is embedded and installed in the interior of the housing 1, and the yoke main magnetic circuit module 2 comprises a main body 2.1, a connecting plate 2.2, a slot 2.3 and a riveting part 2.4, wherein the main body 2.1 is fixedly connected to the inner wall of the housing 1, and the overall appearance of the main body 2.1 is annular, a plurality of connecting plates 2.2 are evenly distributed on the inner wall of the main body 2.1, and the interior of the main body 2.1 is divided by the connecting plate 2.2 to form the slot 2.3; the riveting part 2.4 is arranged on the outer wall of the connecting plate 2.2 away from the main body 2.1, and the slot fill rate of this structure is equivalent to the slot fill rate of the straight bar structure, and a higher slot fill rate means that the coil is filled more fully in the core slot, thereby improving the power density of the motor, which means that under the same volume or mass, the motor with a high slot fill rate can output greater power.

[0036] The insulating frame 3 is plugged into the slot 2.3, and a winding group 4 is wound around the insulating frame 3. The winding speed is fast and is not affected by the bridge wire. It only depends on the maximum tension of the enameled wire itself, and multiple winding equipment can easily operate simultaneously.

[0037] The PCB board 6 is arranged at the bottom of the insulating frame 3, and the PCB board 6 is connected to the PCB board 6 through the pins 5 at the bottom, so that the height of the pins 5 exposed from the PCB board 6 is consistent, which can easily realize automatic soldering and improve production efficiency.

[0038] The combined module 7 includes a fixed component 7.1 and a combined module 7.2, wherein the combined module 7.2 is embedded and installed on the inner side of the fixed component 7.1, and the combined module 7.2 is fixed to the riveted portion 2.4 by riveting. A plurality of evenly distributed notches are provided around the fixed component 7.1, and the riveted portion 2.4 penetrates through the notches and is clamped and fixed to the dovetail tenon 7.23. After riveting, the structure is firm and has high mechanical strength. The riveted structure is not limited by the winding process, and the notch can be designed to be minimized according to the design requirements of the punching sheet, thereby improving the efficiency of the stator magnetic field. In addition, the high slot fill rate reduces the empty space inside the motor, making the motor more compact and reducing noise and vibration.

[0039] A rotor assembly 8 is embedded and installed inside the combined module 7 . 2 , and a rotor shaft 14 is fixedly arranged in the middle position of the rotor assembly 8 .

[0040] The combined module 7.2 includes a closed magnetic circuit connection module 7.21 and an open magnetic circuit connection module 7.22, and the closed magnetic circuit connection module 7.21 and the open magnetic circuit connection module 7.22 are stacked in multiple layers and staggered. The closed magnetic circuit connection module 7.21 is located on the upper and lower sides of the open magnetic circuit connection module 7.22. The combined module 7.2 is fixed to form a whole, which is resistant to pressure without deformation, thereby ensuring that the overall concentric circles after riveting are within the control requirements. Due to the reduction of empty spaces inside the motor, the howling problem of the motor will also be optimized. The high slot fill rate means that the electric field is more concentrated, which helps to improve the performance of the motor.

[0041] The outer walls of the closed-circuit magnetic circuit connection module 7.21 and the open-circuit magnetic circuit connection module 7.22 are both provided with dovetail tenon openings 7.23 for accommodating the riveting portion 2.4, and the edges on both sides of the opening of the dovetail tenon opening 7.23 are provided with cut-face oblique grooves. The purpose of the cut-face oblique grooves is to reduce the main harmonic components. At the same time, the cut-face oblique grooves themselves will generate harmonics. When the harmonics generated by the cut-face oblique grooves change in the same phase as the harmonics generated by the original stator, the positioning torque will increase; otherwise, the positioning torque will be reduced. The harmonics generated by the added auxiliary cut-face grooves will offset the P-th harmonic of the original harmful harmonic components.

[0042] The rotor assembly 8 includes a fixed block 9, an outer rotor core module 10, a magnetic tile 11, an inner rotor core module 12 and a shock absorbing module 13, wherein the fixed block 9 is installed at the center position of the combined module 7, and the outer rotor core module 10 is embedded and installed on the inner side of the fixed block 9; the magnetic tile 11 is plugged and installed around the outer rotor core module 10, and the inner rotor core module 12 is plugged and installed at the center position of the outer rotor core module 10, and a shock absorbing module 13 is arranged between the inner rotor core module 12 and the outer rotor core module 10. The inner and outer rotor cores are connected by the polymer shock absorbing module 13, so that the rotor can achieve a shock absorbing effect, thereby optimizing and improving vibration. In addition, the polymer shock absorbing module has the following two advantages: one is to convert and reduce the vibration amplitude and frequency: in the process of converting electrical energy into mechanical energy, the hard contact between metal and metal is converted into flexible contact through the polymer shock absorbing module as a bridge (the metal is transferred to the polymer shock absorbing module and then to the metal); the second is to improve product quality: the polymer shock absorbing module can improve the stability of the whole machine.

[0043] A plurality of evenly distributed installation grooves 101 for installing magnetic tiles 11 are provided on the four edges of the outer rotor core module 10, and one end of the installation groove 101 away from the center of the outer rotor core module 10 passes through the outer wall of the outer rotor core module 10, the width of the through opening is smaller than the width of the magnetic tile 11, and two opposite half-open magnetic circuit grooves 102 are provided on the two opposite side walls near the opening end of the installation groove 101, and the half-open magnetic circuit grooves 102 have the functions of reducing noise and preventing vibration.

[0044] Furthermore, the outer edge of the outer rotor core module 10 is composed of a plurality of non-concentric eccentric circles in a top view, and the eccentric circles are helpful to weaken the cogging torque.

[0045] A circular hole for installing the inner rotor core module 12 is provided in the middle position of the outer rotor core module 10, and twelve evenly distributed semicircular grooves in a top view are provided on the inner wall of the circular hole. A semicircular protrusion in a top view corresponding to the grooves on the inner wall of the outer rotor core module 10 is provided on the outer wall of the inner rotor core module 12. The outer rotor core module 10 and the inner rotor core module 12 have twelve semicircles, and the angle of one circle is 360°, that is, 360° / 12=30°. The smaller this angle is, the better the dynamic balance of the entire rotor core is, and the more stable the high-speed operation process is. It has the advantages of improving the quality of the rotor and its constituent products, reducing noise, reducing vibration, extending the service life of the supporting components (bearings), reducing product consumption, and improving the efficiency of the entire rotor assembly, that is, improving the efficiency of the motor.

[0046] In summary, the brushless DC motor with a tooth riveted structure is embedded and installed on the inner side of the fixed component through a combined module, and the combined module is fixed to the riveted part by riveting, and the outer walls of the closed magnetic circuit connection module and the open magnetic circuit connection module are provided with dovetail tenons for accommodating the riveted part, and a plurality of evenly distributed notches are provided around the fixed component, and the riveted part passes through the notches and is fixed by clamping with the dovetail tenons, and the closed magnetic circuit connection module and the open magnetic circuit connection module are combined by the fixed component to form a whole, which is resistant to pressure without deformation, thereby Ensure that the overall concentric circles after riveting are within the control requirements, and the structure after riveting is firm, the mechanical strength is high, and the stator magnetic field efficiency is high, the slot fill rate is high, the motor internal empty space is reduced, the motor whistling is optimized, and the electric field strength is enhanced; the cut surface oblique grooves are opened on the edges of the two sides of the dovetail tenon opening, and the outer edge of the outer rotor core module is composed of multiple non-concentric eccentric circles in the top view, and two opposite half-open magnetic circuit grooves are set on the two opposite side walls near the opening end of the installation slot. The purpose of the auxiliary cut surface oblique groove is to reduce the main harmonic distribution The eccentric circle on the outer rotor core module helps to weaken the cogging torque, and the semi-open magnetic circuit slot has the function of reducing noise and preventing vibration, so that the stator and rotor punching sheets help to weaken the cogging torque and have the effect of reducing noise and preventing vibration; a circular hole for installing the inner rotor core module is opened through the middle position of the outer rotor core module, and twelve evenly distributed semicircular grooves in top view are opened on the inner wall of the circular hole, and a semicircular protrusion in top view corresponding to the grooves on the inner wall of the outer rotor core module is arranged on the outer wall of the inner rotor core module. A shock absorbing module is arranged between the sub-core modules, and the inner rotor core module and the outer rotor core module are connected through the shock absorbing module, so that the rotor can play a shock absorbing effect, thereby optimizing and improving vibration, while improving the stability of the whole machine and improving product quality; through the improvement of the brushless DC motor with a riveted tooth structure, it has the advantages of reasonable structural design, high concentric circle precision of the stator assembly, high energy density, and high winding production efficiency, which helps to weaken the tooth slot torque and reduce noise and shockproof effects, thereby effectively solving the problems and shortcomings in the existing technology and equipment.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A brushless DC motor with a tooth riveting structure, comprising: A housing (1), a yoke main magnetic circuit module (2), an insulating frame (3), a winding group (4), a pin (5), a PCB board (6), a combined module (7), a rotor assembly (8), and a rotor shaft (14); characterized in that the yoke main magnetic circuit module (2) is embedded and installed inside the housing (1), and the yoke main magnetic circuit module (2) comprises a main body (2.1), a connecting plate (2.2), a slot (2.3) and a riveting part (2.4), wherein the main body (2.1) is fixedly connected to the inner wall of the housing (1), and the overall appearance of the main body (2.1) is annular, a plurality of connecting plates (2.2) are evenly distributed on the inner wall of the main body (2.1), and the interior of the main body (2.1) is divided by the connecting plate (2.2) to form a slot (2.3); the riveting part (2.4) 4) is arranged on the outer wall of the connecting plate (2.2) at one end away from the main body (2.1); the insulating frame (3) is plugged and installed in the slot (2.3), and a winding group (4) is wound and arranged on the insulating frame (3); the PCB board (6) is arranged at the bottom of the insulating frame (3), and the PCB board (6) is connected to the PCB board (6) through the plug pins (5) at the bottom; the combined module (7) comprises a fixed component (7.1) and a combined module (7.2), wherein the combined module (7.2) is embedded and installed on the inner side of the fixed component (7.1), and the combined module (7.2) is fixed to the riveting part (2.4) by riveting; a rotor component (8) is embedded and installed inside the combined module (7.2), and a rotor shaft (14) is fixedly arranged at the middle position of the rotor component (8).

2. The brushless DC motor with a teeth riveting structure according to claim 1, characterized in that: The combined module (7.2) comprises a closed magnetic circuit connection module (7.21) and an open magnetic circuit connection module (7.22), wherein the closed magnetic circuit connection module (7.21) and the open magnetic circuit connection module (7.22) are stacked in multiple layers and are staggered, and the closed magnetic circuit connection module (7.21) is located on the upper and lower sides of the open magnetic circuit connection module (7.22).

3. A brushless DC motor with a teeth riveting structure according to claim 2, characterized in that: The outer walls of the closed magnetic circuit connection module (7.21) and the open magnetic circuit connection module (7.22) are both provided with dovetail tenon openings (7.23) for accommodating the riveting portion (2.4), and the edges on both sides of the opening of the dovetail tenon opening (7.23) are provided with cut surface oblique grooves.

4. A brushless DC motor with a teeth riveting structure according to claim 3, characterized in that: The fixing assembly (7.1) is provided with a plurality of evenly distributed notches around its periphery, and the riveting portion (2.4) penetrates through the notches and is clamped and fixed with the dovetail tenon (7.23).

5. The brushless DC motor with a teeth riveting structure according to claim 1, characterized in that: The rotor assembly (8) comprises a fixed block (9), an outer rotor core module (10), a magnetic tile (11), an inner rotor core module (12) and a damping module (13), wherein the fixed block (9) is installed at the center of the combined module (7), and the outer rotor core module (10) is embedded and installed on the inner side of the fixed block (9); the magnetic tile (11) is plugged and installed around the outer rotor core module (10), and the inner rotor core module (12) is plugged and installed at the center of the outer rotor core module (10), and the damping module (13) is arranged between the inner rotor core module (12) and the outer rotor core module (10).

6. The brushless DC motor with a teeth riveting structure according to claim 5, characterized in that: A plurality of evenly distributed installation grooves (101) for installing magnetic tiles (11) are provided at the edges of the outer rotor core module (10), and one end of the installation groove (101) away from the center of the outer rotor core module (10) penetrates the outer wall of the outer rotor core module (10), the width of the penetration opening is smaller than the width of the magnetic tile (11), and two opposite half-open magnetic circuit grooves (102) are provided on two opposite side walls close to the opening end of the installation groove (101).

7. The brushless DC motor with a teeth riveting structure according to claim 6, characterized in that: The outer edge of the outer rotor core module (10) is composed of a plurality of non-concentric eccentric circles in a top view.

8. The brushless DC motor with a teeth riveting structure according to claim 6, characterized in that: A circular hole for mounting the inner rotor core module (12) is provided in the middle of the outer rotor core module (10), and twelve evenly distributed grooves having a semicircular shape when viewed from above are provided on the inner wall of the circular hole.

9. The brushless DC motor with a teeth riveting structure according to claim 8, characterized in that: The outer wall of the inner rotor core module (12) is provided with a protrusion having a semicircular top view corresponding to the groove on the inner wall of the outer rotor core module (10).

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