Brushless motor stator virtual slot structure

Abstract

The utility model relates to the technical field of brushless motors, in particular to a brushless motor stator virtual slot structure, which comprises a stator iron core, one side of the stator iron core is fixedly connected with an insertion rod, the other side of the stator iron core is provided with an insertion slot, the surface of the stator iron core is provided with a profiling slot, and the surface of the stator iron core is provided with an insertion groove. One side of the stator core is fixedly connected with a first connecting plate, the other side of the stator core is fixedly connected with a second connecting plate, the surface of the first connecting plate is provided with an insertion hole, and the surface of the second connecting plate is provided with a first sliding groove and a second sliding groove. According to the utility model, the two groups of profiling grooves are additionally arranged on the tooth part of the stator iron core, the two groups of profiling grooves are semicircular and symmetrically distributed, and can be used as stator notches to counteract the shifting of the tooth grooves, so that the problem of hand feeling vibration caused by the torque of the tooth grooves is solved, and compared with the prior art, the structure is simple, the manufacturing efficiency is high, the consistency is good, and the production cost is low. And the cogging torque can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless motors, in particular to a virtual slot structure of a brushless motor stator. Background Technique

[0002] With the development of the motor-assisted steering system and the improvement of driving comfort, customers have increasingly strict requirements for the cogging torque of the motor.

[0003] A large cogging torque will not only lead to a poor driving feel, but also generate noise, affecting comfort. However, due to the manufacturing process of existing brushless motors, there is often a slot opening in the stator core, which easily causes cogging torque during the operation of the motor, affecting driving comfort. Content of the Utility Model

[0004] The purpose of the utility model is to provide a virtual slot structure of a brushless motor stator to solve the problem that due to the manufacturing process of the brushless motor, there is often a slot opening in the stator core, which easily causes cogging torque during the operation of the motor, affecting driving comfort as mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a virtual slot structure of a brushless motor stator, including a stator core, one side of the stator core is fixedly connected with an insertion rod, the other side of the stator core is provided with an insertion slot, the surface of the stator core is provided with a profiling slot, one side of the stator core is fixedly connected with a first connecting plate, the other side of the stator core is fixedly connected with a second connecting plate, the surface of the first connecting plate is provided with an insertion hole, the surface of the second connecting plate is provided with a first sliding slot and a second sliding slot, a limiting rod is installed on the surface of the insertion hole, and a sliding block is fixedly connected to the surface of the limiting rod.

[0006] Preferably, the cross-section of the stator core is in a "T" shape, the insertion rod is inserted and connected to the surface of the insertion slot, and there are two groups of profiling slots.

[0007] Preferably, the surface of the profiling slot is in a semi-circular arc shape, the two groups of profiling slots are arranged on both sides of the stator core, and the size of the first connecting plate is the same as that of the second connecting plate.

[0008] Preferably, the cross-sections of the first connecting plate and the second connecting plate are in an "L" shape, the first connecting plate is snap-connected to the surface of the second connecting plate, and there are two groups of insertion holes.

[0009] Preferably, one group of the insertion holes is opened on the surface of the first connecting plate, and the other group of the insertion holes is opened on the surface of the second connecting plate. The length of the first slide groove is the same as the length of the second slide groove. Two groups of the second slide grooves are provided, and the two groups of the second slide grooves are opened on both sides of the second connecting plate.

[0010] Preferably, the cross-section of the limit rod is "L"-shaped, one end of the limit rod is slidably connected to the surface of the first slide groove, the other end of the limit rod is plugged into the surface of the plug-in hole, and the limit rod passes through the plug-in hole to be connected to the surfaces of the first connecting plate and the second connecting plate.

[0011] Preferably, two groups of sliding blocks are provided, the two groups of sliding blocks are fixedly connected to the two sides of the limiting rod, and the sliding blocks are slidably connected to the surface of the second sliding groove.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. By adding two groups of profiling grooves on the teeth of the stator core, the two groups of profiling grooves are semicircular and symmetrically distributed, and can act as stator notches, which can offset the movement of the tooth slots, thereby solving the problem of hand vibration caused by the tooth slot torque. Compared with the prior art, the structure is simple, the manufacturing efficiency is high and the consistency is good, and the tooth slot torque can be effectively reduced.

[0014] 2. By fixing the first connecting plate and the second connecting plate on both sides of the stator core respectively, when installing two sets of stator cores, the first connecting plate can be abutted against the second connecting plate, thereby achieving the surface maintaining the same horizontal plane when installing the two sets of stator cores, so as to avoid affecting the installation of the next set of stator cores, making the installation process more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view stereoscopic schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a top-down perspective schematic diagram of the structure of the utility model;

[0017] Figure 3 It is a structural stereoscopic schematic diagram of the first connecting plate of the utility model;

[0018] Figure 4 For this utility model Figure 3 A three-dimensional schematic diagram of the structure of the middle plug-in rod;

[0019] Figure 5 For this utility model Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0020] In the figure: 1, stator core; 2, insertion rod; 3, insertion slot; 4, profiling slot; 5, first connecting plate; 6, second connecting plate; 7, insertion hole; 8, first sliding groove; 9, second sliding groove; 10, limiting rod; 11, sliding block. Detailed implementation mode

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1-5 , an embodiment provided by the present invention:

[0023] A brushless motor stator virtual slot structure includes a stator core 1. One side of the stator core 1 is fixedly connected with an insertion rod 2, and the other side of the stator core 1 is provided with an insertion slot 3. The surface of the stator core 1 is provided with a profiling slot 4. One side of the stator core 1 is fixedly connected with a first connecting plate 5, and the other side of the stator core 1 is fixedly connected with a second connecting plate 6. The surface of the first connecting plate 5 is provided with an insertion hole 7. The surface of the second connecting plate 6 is provided with a first sliding groove 8 and a second sliding groove 9. The surface of the insertion hole 7 is provided with a limiting rod 10, and the surface of the limiting rod 10 is fixedly connected with a sliding block 11. When a group of stator cores 1 are inserted into another group of stator cores 1 from top to bottom through the connection of the insertion rod 2 and the insertion slot 3, the first connecting plate 5 abuts against the second connecting plate 6, and the two insertion holes 7 are automatically aligned.

[0024] Furthermore, the cross-section of the stator core 1 is in a "T" shape. The insertion rod 2 is inserted and connected to the surface of the insertion slot 3. There are two groups of profiling slots 4. Through the connection of the insertion rod 2 and the insertion slot 3, the splicing effect of the two groups of stator cores 1 can be achieved, and then all the stator cores 1 can be spliced into a ring shape. The profiling slot 4 is the stator virtual slot to be opened.

[0025] Furthermore, the surface of the profiling slot 4 is in a semi-circular arc shape. The two groups of profiling slots 4 are opened on both sides of the stator core 1. The size of the first connecting plate 5 is the same as that of the second connecting plate 6. The two groups of profiling slots 4 are opened on the inner circle of the stator core 1 and are symmetrically distributed.

[0026] Furthermore, the cross-sections of the first connecting plate 5 and the second connecting plate 6 are in an "L" shape. The first connecting plate 5 is snap-connected to the surface of the second connecting plate 6. There are two groups of insertion holes 7. Through the connection of the first connecting plate 5 and the second connecting plate 6, the limiting rod 10 can be installed in the two insertion holes 7.

[0027] Further, a set of insertion holes 7 are formed on the surface of the first connecting plate 5, and another set of insertion holes 7 are formed on the surface of the second connecting plate 6. The length of the first sliding groove 8 is the same as that of the second sliding groove 9. There are two sets of the second sliding grooves 9, which are formed on both sides of the second connecting plate 6. Through the first sliding groove 8, the limiting rod 10 can move on its surface. Under the action of the second sliding groove 9, the installation of the sliding block 11 can be realized, and through the second sliding groove 9, the outside of the second connecting plate 6 communicates with the surface of the first sliding groove 8.

[0028] Further, the cross-section of the limiting rod 10 is in an "L" shape. One end of the limiting rod 10 is slidably connected to the surface of the first sliding groove 8, and the other end of the limiting rod 10 is inserted and connected to the surface of the insertion hole 7. The limiting rod 10 passes through and connects the surfaces of the first connecting plate 5 and the second connecting plate 6 through the insertion hole 7. Under the connection of the limiting rod 10 and the two sets of insertion holes 7, the limiting of the first connecting plate 5 and the second connecting plate 6 can be realized, and further the longitudinal limiting of the two connected stator cores 1 can be realized.

[0029] Further, there are two sets of sliding blocks 11, and the two sets of sliding blocks 11 are fixedly connected to both sides of the limiting rod 10. The sliding blocks 11 are slidably connected to the surface of the second sliding groove 9. Under the connection of the sliding blocks 11 and the second sliding groove 9, the limiting of the limiting rod 10 can be realized, so that the movement of the limiting rod 10 can drive the movement of the sliding blocks 11, and the sliding blocks 11 are made of rubber material and can be removed from the surface of the second sliding groove 9.

[0030] Working principle: The principle of cogging torque generation is the torque generated by the interaction between the permanent magnet and the stator core 1 when the winding of the permanent magnet motor is not energized. When the motor rotor rotates, within a small range corresponding to the stator slot openings on both sides of the permanent magnet, the magnetic conductance changes greatly, causing the magnetic field energy storage to change, and thus generating cogging torque. The principle of reducing cogging torque by opening the profiling groove 4 lies in equivalently increasing the fundamental wave period of cogging torque. The cogging torque generated by the profiling groove 4 compensates for the cogging torque of the original slot opening, thereby reducing the total dimension torque amplitude.

[0031] During the installation process, first insert a set of stator cores 1 into the insertion grooves 3 formed on the other set of stator cores 1 through the insertion rods 2, so that the surfaces of the first connecting plate 5 and the second connecting plate 6 are engaged, and align the hole positions of the two sets of insertion holes 7. The two sets of stator cores 1 are on the same horizontal plane. At this time, push the limiting rod 10 so that one end slides on the surface of the first sliding groove 8, and the other end sequentially passes through the two sets of insertion holes 7 to drive the sliding blocks 11 to slide on the surface of the second sliding groove 9, so as to realize the limiting of the two sets of stator cores 1. Further, after all the stator cores 1 are connected, a ring can be formed. After installation, push the limiting rod 10 again and pull it upward to disconnect the sliding blocks 11 from the second sliding groove 9 to avoid being affected by the limiting rod 10 during normal operation.

[0032] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be construed as limiting the claimed rights involved.

Claims

1. A brushless motor stator virtual slot structure, comprising a stator core (1), characterized in that: One side of the stator core (1) is fixedly connected with an insertion rod (2), the other side of the stator core (1) is provided with an insertion groove (3), the surface of the stator core (1) is provided with a contoured groove (4), one side of the stator core (1) is fixedly connected with a first connecting plate (5), the other side of the stator core (1) is fixedly connected with a second connecting plate (6), the surface of the first connecting plate (5) is provided with an insertion hole (7), the surface of the second connecting plate (6) is provided with a first sliding groove (8) and a second sliding groove (9), the surface of the insertion hole (7) is provided with a limiting rod (10), and the surface of the limiting rod (10) is fixedly connected with a sliding block (11).

2. The brushless motor stator virtual slot structure according to claim 1, characterized in that: The cross section of the stator core (1) is T-shaped, the insertion rod (2) is inserted and connected to the surface of the insertion slot (3), and two groups of the contoured slots (4) are provided.

3. The brushless motor stator virtual slot structure according to claim 2, characterized in that: The surface of the profiling groove (4) is in a semicircular arc shape, two groups of the profiling grooves (4) are arranged on both sides of the stator core (1), and the size of the first connecting plate (5) is the same as the size of the second connecting plate (6).

4. The brushless motor stator virtual slot structure according to claim 3, characterized in that: The cross-sections of the first connecting plate (5) and the second connecting plate (6) are L-shaped; the first connecting plate (5) is snap-connected to the surface of the second connecting plate (6); and two groups of the inserting holes (7) are provided.

5. The brushless motor stator virtual slot structure according to claim 4, characterized in that: One group of the plug-in holes (7) is opened on the surface of the first connecting plate (5), and another group of the plug-in holes (7) is opened on the surface of the second connecting plate (6). The length of the first slide groove (8) is the same as the length of the second slide groove (9). Two groups of the second slide grooves (9) are provided, and the two groups of the second slide grooves (9) are opened on both sides of the second connecting plate (6).

6. The brushless motor stator virtual slot structure according to claim 1, characterized in that: The cross section of the limiting rod (10) is "L"-shaped, one end of the limiting rod (10) is slidably connected to the surface of the first sliding groove (8), the other end of the limiting rod (10) is plugged into the surface of the plug-in hole (7), and the limiting rod (10) passes through the plug-in hole (7) and is connected to the surfaces of the first connecting plate (5) and the second connecting plate (6).

7. The brushless motor stator virtual slot structure according to claim 1, characterized in that: The sliding blocks (11) are provided in two groups, and the two groups of sliding blocks (11) are fixedly connected to the two sides of the limiting rod (10), and the sliding blocks (11) are slidably connected to the surface of the second sliding groove (9).

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