A high-torque brushless motor

Abstract

The present invention discloses a high-torque brushless motor, comprising a stator, wherein the stator comprises a stator core, the stator core comprises a plurality of stator punchings, a locking screw, a first end cover, and a second end cover. The stator punchings are each provided with a groove, and the locking screw locks the stator punchings to form the stator core. After the plurality of stator punchings are locked by the locking screw, the grooves cooperate to form a matching groove that cooperates with the locking screw. The first end cover is provided with a through hole for the locking screw to pass through, and the second end cover is provided with a screw hole that cooperates with the locking screw. The first end cover and the second end cover cooperate with the locking screw to lock the stator core. The present invention improves the existing problem of unreasonable fixing structure of the motor stator core. The present invention has the advantages of cost saving, high assembly efficiency, high reliability, good stability, and strong applicability.

Description

Technical Field

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

[0002] A motor, generally referred to as an electric motor, is a common power device widely used in existing technologies. Electric motors are generally categorized as brushed motors and brushless motors. Brushless motors offer more stable performance and are easier to maintain than brushed motors, making them widely used.

[0003] A brushless motor consists of a stator and a rotor. The rotor rotates relative to the stator to output power. The stator comprises a stator core and windings wound around the stator core. The stator core is composed of stator laminations, which are stacked to form the stator core. To ensure structural stability, bolts are typically used to secure the stator laminations. This fixing scheme forces the bolts to penetrate the stator laminations, which can affect the performance of the stator core and, in turn, the motor. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a high-torque brushless motor to solve the technical problems of the prior art such as the unreasonable fixing structure of the motor stator core.

[0005] The present invention is achieved through the following technical solution: The present invention discloses a high-torque brushless motor, including a stator, wherein the stator includes a stator core, and the stator core includes:

[0006] A plurality of stator punching sheets, each of which is provided with a groove;

[0007] A locking screw, wherein the locking screw locks the stator punching to form the stator core;

[0008] After a plurality of stator punching sheets are locked by the locking screws, the grooves cooperate to form matching grooves that cooperate with the locking screws;

[0009] The stator further comprises:

[0010] a first end cover, wherein the first end cover is provided with a through hole for the locking screw to pass through;

[0011] a second end cover, wherein the second end cover is provided with a screw hole that cooperates with the locking screw;

[0012] The first end cover and the second end cover cooperate with the locking screws to lock the stator core.

[0013] Preferably, the stator punching sheet further includes:

[0014] first convex part;

[0015] a second convex portion, wherein the first convex portion and the second convex portion both protrude in the radial direction of the stator punching sheet, and the first convex portion and the second convex portion cooperate to form the groove, and the first convex portion and the second convex portion are both an integral structure with the stator punching sheet;

[0016] a third convex portion, the third convex portion protruding in a radial direction of the stator punching sheet, and the third convex portion and the stator punching sheet forming an integral structure;

[0017] The stator core further includes heat dissipation ribs, which are formed by laminating the third protrusions.

[0018] Preferably, the first end cover and the second end cover each include a cavity for accommodating the stator core, and a portion of the stator core extends into the cavity.

[0019] Preferably, the first end cover is provided with heat dissipation holes, the heat dissipation holes are evenly distributed on the first end cover, and the heat dissipation holes are communicated with the cavity.

[0020] Preferably, both the first end cover and the second end cover are provided with a positioning groove, and the positioning groove includes a first groove body and a second groove body;

[0021] A portion of the first protrusion and a portion of the second protrusion are located in the first slot;

[0022] A portion of the heat dissipation ribs is located in the second tank.

[0023] Preferably, the locking screw comprises:

[0024] a nail head, wherein an elastic gasket is provided between the nail head and the first end cover;

[0025] The nail rod, the elastic gasket is sleeved on the nail rod, the nail head and the nail rod are an integrated structure, the nail rod includes a smooth rod portion and a screw rod portion, the smooth rod portion and the screw rod portion are coaxially arranged, and the length of the screw rod portion is not less than half of the length of the nail rod.

[0026] Preferably, the depth of the groove is not less than the depth of the nail rod, and the width of the groove is greater than the diameter of the nail rod.

[0027] Preferably, the first end cover is provided with a clearance groove for accommodating the nail head, and the first end cover and the second end cover are both provided with a clearance notch for increasing the contact area between the stator core and the outside world, and the clearance notch passes through the first end cover and the second end cover respectively along the radial direction of the cavity.

[0028] Preferably, the grooves are evenly distributed on the circumference of the stator punching sheet, the number of the grooves is not less than four, and the number of the grooves on the same stator punching sheet is an even number.

[0029] Preferably, both the first end cover and the second end cover are provided with ribs, the cross-section of the ribs is semicircular, the through hole is provided on the ribs on the first end cover, and the screw hole is provided on the ribs on the second end cover.

[0030] The present invention discloses a high-torque brushless motor. Compared with the prior art:

[0031] The present invention does not require drilling holes on the stator punching sheets, and the stator punching sheets can be fixed using the first end cover and the second end cover. This solution will not affect the performance of the stator core, and thus will not affect the performance of the motor. The present invention makes the stator structure reasonable and optimizes the performance of the high-torque brushless motor.

[0032] The groove in the present invention is formed by the cooperation of the first convex portion and the second convex portion, and the first convex portion and the second convex portion protrude from the stator punching sheet. This solution does not require drilling on the stator punching sheet, thereby not affecting the performance of the stator punching sheet and reducing the processing cost of the stator punching sheet.

[0033] The present invention has the advantages of cost saving, high assembly efficiency, high reliability, good stability and strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0035] Figure 2 Schematic diagram of the three-dimensional structure of the stator punching sheet;

[0036] Figure 3 It is the front view of the present invention;

[0037] Figure 4 is a cross-sectional view of the present invention;

[0038] 1. Stator core; 2. Stator punching sheet; 21. First protrusion; 22. Second protrusion; 23. Third protrusion; 24. Heat dissipation rib; 3. Locking screw; 31. Nail head; 32. Nail rod; 321. Polished rod portion; 322. Screw portion; 4. Groove; 5. Matching groove; 6. First end cover; 61. Heat dissipation hole; 7. Second end cover; 8. Cavity; 9. First trough body; 10. Second trough body; 11. Clearance notch; 12. Protruding rib. DETAILED DESCRIPTION

[0039] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0040] Example 1

[0041] Example 1 discloses a high torque brushless motor, referring to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , including a stator, the stator including a stator core 1, the stator core 1 including:

[0042] A plurality of stator punching sheets 2, each of which is provided with a groove 4;

[0043] The locking screw 3 is used to lock the stator punching sheet 2 to form the stator core 1;

[0044] After a number of stator punching sheets 2 are locked by locking screws 3, the grooves 4 cooperate to form matching grooves 5 that cooperate with the locking screws 3;

[0045] All the stator punching sheets 2 are stacked to form the stator core 1. After the stator punching sheets 2 are stacked, the grooves 4 on the stator punching sheets 2 cooperate to form a matching groove 5, which means that the grooves 4 on two adjacent stator punching sheets 2 correspond to each other to form a matching groove 5 that passes through the stator core 1. The matching groove 5 cooperates with the locking screw 3.

[0046] The stator also includes:

[0047] A first end cover 6, wherein the first end cover 6 is provided with a through hole for the locking screw 3 to pass through;

[0048] A second end cover 7 is provided with a screw hole that cooperates with the locking screw 3;

[0049] The first end cover 6 and the second end cover 7 cooperate with the locking screws 3 to lock the stator core 1 .

[0050] In the prior art, the stator punching sheets 2 that form the stator core 1 all need to be punched. After the stator punching sheets 2 are stacked, bolt holes for passing bolts are formed. All stator punching sheets 2 are locked by bolts to form the stator core 1. The bolts in this solution need to be inserted into the stator punching sheets 2. On the one hand, holes need to be punched in the stator punching sheets 2, which makes the stator punching sheets 2 difficult to process. On the other hand, since holes need to be punched in the stator punching sheets 2, the relative positions of the two adjacent stator punching sheets 2 are required to be high to avoid the holes being staggered and the bolts being unable to be assembled. This solution makes the processing of the stator punching sheets 2 difficult and the processing cost high. In addition, since the bolts and the stator punching sheets 2 are made of different materials, the bolts passing through the stator punching sheets 2 have a certain impact on the performance of the stator punching sheets 2, and thus affects the performance of the stator core 1.

[0051] In this embodiment, a groove 4 is provided on the stator punching sheet 2. The groove 4 is open, and the mating groove 5 formed by the groove 4 is also open. This solution allows the stator punching sheet 2 to be mated with the locking screw 3 without the need for drilling holes. On the one hand, it is easy to assemble the stator punching sheet 2, easy to manufacture the stator punching sheet 2, and the stator punching sheet 2 has a low processing cost; on the other hand, the locking screw 3 is easy to mate with the assembly groove, which improves the assembly efficiency of the stator core 1. The locking screw 3 does not need to be completely located in the stator core 1 to achieve the locking of the stator punching sheet 2, reducing the impact of the locking screw 3 on the performance of the stator core 1, thereby optimizing the performance of the high-torque brushless motor. Specifically, under high load conditions, the stator and the motor will not be offset from the center, thereby having high reliability and high stability.

[0052] The arrangement of the first end cover 6 and the second end cover 7 in this embodiment further simplifies the structure of the stator punching sheet 2, that is, it is not necessary to arrange threads in the groove 4 to assemble it with the locking screw 3; the arrangement of the first end cover 6 and the second end cover 7 can simplify the structure of the high-torque brushless motor, that is, the first end cover 6 and the second end cover 7 can be used as the shell of the high-torque brushless motor, thereby reducing the processing cost of the high-torque brushless motor. Since the stator core 1 has a large contact area with the air, the heat dissipation efficiency of the high-torque brushless motor is improved, thereby extending the service life of the high-torque brushless motor.

[0053] As the preferred solution, refer to Figure 1 and Figure 2 , the stator sheet 2 also includes:

[0054] first convex portion 21;

[0055] The second convex portion 22, the first convex portion 21 and the second convex portion 22 all protrude in the radial direction of the stator punching 2, and the first convex portion 21 and the second convex portion 22 cooperate to form the groove 4, and the first convex portion 21 and the second convex portion 22 are both an integral structure with the stator punching 2;

[0056] A third convex portion 23 protrudes in the radial direction of the stator punching sheet 2, and the third convex portion 23 and the stator punching sheet 2 are an integrated structure;

[0057] The stator core 1 further includes heat dissipation ribs 24 , which are formed by laminating the third protrusions 23 .

[0058] The groove 4 is formed by the cooperation of the first protrusion 21 and the second protrusion 22, which simplifies the structure of the stator punching 2; the arrangement of the first protrusion 21 and the second protrusion 22 is conducive to increasing the contact area between the stator punching 2 and the air, which is beneficial to the heat dissipation of the stator, and the third protrusion 23 forms a heat dissipation rib 24, which mainly plays the function of dissipating heat from the stator core 1; on the other hand, the heat dissipation rib 24 cooperates with the first end cover 6 and the second end cover 7 to also play the function of positioning the stator punching 2, that is, the stator core 1 is not easy to rotate relative to the first end cover 6 and the second end cover 7, thereby improving the stability performance of the high-torque brushless motor during operation.

[0059] The stator laminations 2 have grooves 4, which facilitate assembly of the stator laminations 2 and improve stator assembly efficiency. In addition, the locking screws 3 cooperate with the grooves 4, so the number of stator laminations 2 that can be stacked is unlimited. The number of stator laminations 2 can be easily adjusted to adjust the power of the high-torque brushless motor. This structure is suitable for high-power brushless motors.

[0060] As the preferred solution, refer to Figure 3 and Figure 4 The first end cover 6 and the second end cover 7 both include a cavity 8 for accommodating the stator core 1, and a portion of the stator core 1 extends into the cavity 8. This arrangement can optimize the heat dissipation performance of the stator core 1 while firmly positioning the stator core 1, thereby improving the stability of the high-torque brushless motor.

[0061] The high-torque brushless motor also boasts stable overall performance. The stator, including a first end cap 6 and a second end cap 7, functions as a housing. Under high load conditions, the stator and housing are prevented from centered. Furthermore, the first and second end caps 6 and 7 function as housings, simplifying the structure of the high-torque brushless motor and reducing its manufacturing cost.

[0062] As the preferred solution, refer to Figure 1 and Figure 3 The first end cover 6 is provided with heat dissipation holes 61 , which are evenly distributed on the first end cover 6 and are communicated with the cavity 8 .

[0063] The shape and number of the heat dissipation holes 61 are not limited. The heat dissipation holes 61 mainly serve to dissipate heat. In addition, the setting of the heat dissipation holes 61 also serves to reduce the manufacturing cost of the first end cover 6, thereby reducing the manufacturing cost of the high-torque brushless motor.

[0064] As the preferred solution, refer to Figure 1 , the first end cover 6 and the second end cover 7 are both provided with a positioning groove, and the positioning groove includes a first groove body 9 and a second groove body 10;

[0065] A portion of the first protrusion 21 and a portion of the second protrusion 22 are located in the first groove 9;

[0066] A portion of the heat dissipation ribs 24 is located inside the second tank body 10 .

[0067] The first slot body 9 and the second slot body 10 are mainly used to position the stator core 1 and prevent the stator core 1 from rotating relative to the first end cover 6 and the second end cover 7, so as to optimize the performance of the high-torque brushless motor and improve its reliability and stability.

[0068] As the preferred solution, refer to Figure 1 , locking screw 3 includes:

[0069] The nail head 31 and an elastic gasket are provided between the nail head 31 and the first end cover 6; the elastic gasket is provided to prevent loosening.

[0070] The nail rod 32 and the elastic gasket are sleeved on the nail rod 32. The nail head 31 and the nail rod 32 are an integrated structure. The nail rod 32 includes a smooth rod portion 321 and a screw portion 322. The smooth rod portion 321 and the screw portion 322 are coaxially arranged, and the length of the screw portion 322 is not less than half the length of the nail rod 32.

[0071] The screw portion 322 has a longer length, so that the locking screw 3 can adapt to stator cores 1 of different lengths. After the length of the stator core 1 is adjusted, the locking screw 3 can still lock the stator punching 2, thereby optimizing the performance of the locking screw 3.

[0072] As the above preferred solution, the depth of the groove 4 is not less than the depth of the nail rod 32 , and the width of the groove 4 is greater than the diameter of the nail rod 32 .

[0073] Taking into account the assembly requirements, the width of the groove 4 should be greater than the diameter of the nail rod 32. The nail rod 32 can be completely located in the groove 4, or only a portion of the nail rod 32 can be located in the groove 4.

[0074] As the preferred solution, refer to Figure 1 The first end cap 6 is provided with a clearance groove for accommodating the nail head 31. A clearance notch 11 is provided on both the first end cap 6 and the second end cap 7 to increase the contact area between the stator core 1 and the outside world. The clearance notch 11 extends radially through the first end cap 6 and the second end cap 7, respectively, in the cavity 8. The clearance notch 11 is provided primarily for heat dissipation.

[0075] As the preferred solution, refer to Figure 2 The grooves 4 are evenly distributed on the circumference of the stator punching sheet 2. The number of the grooves 4 is four, and the number of the grooves 4 on the same stator punching sheet 2 is an even number.

[0076] The number of grooves 4 and locking screws 3 corresponds one to one, and the number of grooves 4 is an even number. This solution allows the stator core 1 to be subjected to uniform force. That is, when the locking screws 3 lock the stator punching 2, the stator core 1 is subjected to the locking force of the locking screws 3 evenly, and the stator core 1 is not easily damaged.

[0077] The larger the diameter of the stator core 1 is, the more grooves 4 should be provided to improve the stability of the stator core 1 .

[0078] As the preferred solution, refer to Figure 1 The first end cover 6 and the second end cover 7 are both provided with ribs 12, the cross-sectional shape of the ribs 12 is semicircular, the through hole is provided on the ribs 12 on the first end cover 6, and the screw hole is provided on the ribs 12 on the second end cover 7.

[0079] The rib 12 is mainly provided to assemble the locking screw 3. The rib 12 allows the diameters of the first end cover 6 and the second end cover 7 to be matched with the locking screw 3 without being set too large, thereby reducing the manufacturing cost of the first end cover 6 and the second end cover 7.

[0080] This embodiment has the advantages of cost saving, high assembly efficiency, high reliability, good stability and strong applicability.

Claims

1. A high torque brushless motor, comprising a stator, characterized in that: The stator comprises a stator core (1), and the stator core (1) comprises: A plurality of stator punching sheets (2), each of the stator punching sheets (2) being provided with a groove (4); A locking screw (3), wherein the locking screw (3) locks the stator punching sheet (2) to form the stator core (1); After a plurality of the stator punching sheets (2) are locked by the locking screws (3), the grooves (4) cooperate to form matching grooves (5) that cooperate with the locking screws (3); The stator further comprises: a first end cover (6), wherein the first end cover (6) is provided with a through hole for the locking screw (3) to pass through; A second end cover (7), wherein the second end cover (7) is provided with a screw hole that cooperates with the locking screw (3); The first end cover (6) and the second end cover (7) cooperate with the locking screw (3) to lock the stator core (1); The stator punching sheet (2) further comprises: first convex part (21); a second convex portion (22), wherein the first convex portion (21) and the second convex portion (22) both protrude radially of the stator punching sheet (2), and the first convex portion (21) and the second convex portion (22) cooperate to form the groove (4), and the first convex portion (21) and the second convex portion (22) are both integrally formed with the stator punching sheet (2); a third convex portion (23), the third convex portion (23) protruding in the radial direction of the stator punching sheet (2), and the third convex portion (23) and the stator punching sheet (2) are an integrated structure; The stator core (1) further includes heat dissipation ribs (24), and the heat dissipation ribs (24) are formed by laminating the third convex portions (23); The first end cover (6) and the second end cover (7) both comprise a cavity (8) for accommodating the stator core (1), and a portion of the stator core (1) extends into the cavity (8); The first end cover (6) and the second end cover (7) are both provided with positioning grooves, and the positioning grooves include a first groove body (9) and a second groove body (10); A portion of the first protrusion (21) and a portion of the second protrusion (22) are located in the first groove (9); A portion of the heat dissipation ribs (24) is located in the second tank body (10); The locking screw (3) comprises: a nail head (31), wherein an elastic gasket is provided between the nail head (31) and the first end cover (6); A nail rod (32), wherein the elastic gasket is sleeved on the nail rod (32), the nail head (31) and the nail rod (32) are an integrated structure, the nail rod (32) comprises a smooth rod portion (321) and a screw rod portion (322), the smooth rod portion (321) and the screw rod portion (322) are coaxially arranged, and the length of the screw rod portion (322) is not less than half the length of the nail rod (32); The first end cover (6) is provided with a clearance groove for accommodating the nail head (31), and the first end cover (6) and the second end cover (7) are both provided with a clearance notch (11) for increasing the contact area between the stator core (1) and the outside world, and the clearance notch (11) respectively penetrates the first end cover (6) and the second end cover (7) along the radial direction of the cavity (8); Both the first end cover (6) and the second end cover (7) are provided with convex ribs, the cross-sectional shape of the convex ribs is semicircular, the through hole is provided on the convex rib on the first end cover (6), and the screw hole is provided on the convex rib on the second end cover (7).

2. A high torque brushless motor according to claim 1, characterized in that: The first end cover (6) is provided with heat dissipation holes (61), the heat dissipation holes (61) are evenly distributed on the first end cover (6), and the heat dissipation holes (61) are communicated with the cavity (8).

3. A high torque brushless motor according to claim 1, characterized in that: The depth of the groove (4) is not less than the depth of the nail rod (32), and the width of the groove (4) is greater than the diameter of the nail rod (32).

4. A high torque brushless motor as claimed in claim 3, characterized in that: The grooves (4) are evenly distributed on the circumference of the stator punching sheet (2), the number of the grooves (4) is not less than four, and the number of the grooves (4) located on the same stator punching sheet (2) is an even number.

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