A magnetic pull stabilized motor structure

Abstract

The utility model discloses a kind of motor structures with stable magnetic pull. It includes: cabinet;Stator assembly, the stator assembly is fixed in the inside of cabinet, the stator assembly includes stator core, and copper wire winding is provided on the stator core;Rotor assembly, the rotor assembly is placed in the inside of the stator core and both rotationally connected, the rotor assembly includes rotor core, the length of the rotor core is greater than the length of stator core, the end face of the both ends of the rotor core all exceeds the end face of the both ends of stator core and the exceeding length of both ends is equal, magnetic block is provided on the rotor core, the end face of the both ends of the magnetic block also all exceeds the end face of the both ends of stator core and the exceeding length of both ends is equal. The beneficial effects of the utility model are: eliminate the magnetic pull problem from single side, ensure that rotor assembly will not be affected by the magnetic pull of a direction and produce oscillation.

Description

Technical Field

[0001] This utility model relates to the field of motor-related technology, and in particular to a motor structure with stable magnetic pull. Background Technology

[0002] Currently, in commercially available motors, the stator core height is the same as the rotor core height. Furthermore, theoretically, after the rotor is installed in the stator, the two end faces of the rotor core should be flush with the two end faces of the stator core (e.g., ...). Figure 1 (As shown).

[0003] However, in actual products, due to limitations in the tolerances of the rotor core itself, the stator core itself, and tooling errors during insertion, it is difficult to achieve perfect alignment between the rotor core and the stator core, resulting in axial misalignment (e.g., Figure 2 and Figure 3 (As shown). When the stator coil interacts with the rotor magnetic blocks after being energized, the uneven distribution of the magnetic field causes a shift due to the interaction of the magnetic fields. This results in a unilateral magnetic pull force opposite to the direction of the magnetic block misalignment, causing the entire rotor assembly to oscillate axially. This has a particularly significant impact on the 5th and 7th order of the motor, which in turn leads to NVH problems and motor lifespan issues.

[0004] In summary, there is a need for a magnetically stable motor structure that can eliminate the problem of unilateral magnetic pull. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of the prior art and provide a motor structure with stable magnetic pull that can eliminate the problem of unilateral magnetic pull.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A magnetically stabilized motor structure includes: chassis; A stator assembly, which is fixed inside the housing, includes a stator core on which copper wire windings are provided; A rotor assembly is placed inside the stator core and the two are rotatably connected. The rotor assembly includes a rotor core, the length of which is greater than the length of the stator core. The end faces of both ends of the rotor core extend beyond the end faces of both ends of the stator core, and the extension lengths at both ends are equal. A magnetic block is provided on the rotor core, and the end faces of both ends of the magnetic block also extend beyond the end faces of both ends of the stator core, and the extension lengths at both ends are equal.

[0007] This invention increases the length of the rotor core to ensure that both ends of the magnetic block extend beyond the ends of the stator core. This results in both ends of the rotor assembly being subjected to magnetic pull from the magnetic block in opposite directions, thus eliminating the problem of magnetic pull from one side and ensuring that the rotor assembly will not oscillate due to magnetic pull in one direction.

[0008] Preferably, the rotor core is composed of a first rotor core segment and a second rotor core segment fixedly connected to each other. A first magnetic block holder is fixed on the first rotor core segment, and a second magnetic block holder is fixed on the second rotor core segment. The magnetic block includes a first magnetic block fixed on the first magnetic block holder and a second magnetic block fixed on the second magnetic block holder. The end face of the first rotor core segment away from the second rotor core segment extends 0.5 mm beyond the end face of one end of the stator core. Similarly, the end face of the second rotor core segment away from the first rotor core segment also extends 0.5 mm beyond the end face of the other end of the stator core. The end face of the first magnetic block away from the second rotor core segment extends by a length a beyond the end face a of one end of the stator core. Similarly, the end face of the second magnetic block away from the first rotor core segment also extends by a length a beyond the end face a of the other end of the stator core. The rotor core is designed to be 1mm higher than the stator core, ensuring that both ends of the magnetic block extend beyond the length 'a' of both ends of the stator core. This ensures that both ends of the rotor assembly are subjected to magnetic pull from the magnetic block in opposite directions, thus eliminating the problem of magnetic pull from one side and preventing the rotor assembly from oscillating due to magnetic pull in one direction.

[0009] Preferably, the length of 'a' is greater than 1 mm and less than or equal to 5 mm.

[0010] Preferably, both the first and second magnetic block holders are fixed with magnetic block limiting bosses, which are positioned between the first and second magnetic block holders. This design of the magnetic block limiting bosses allows the magnetic blocks to stably extend beyond both ends of the stator core, improving structural stability.

[0011] Preferably, the first magnetic block holder is provided with a first magnetic block mounting slot, the first magnetic block is installed in the first magnetic block mounting slot, and there is a step difference b between the root of the first magnetic block mounting slot and the first magnetic block. The second magnetic block holder is provided with a second magnetic block mounting slot, the second magnetic block is installed in the second magnetic block mounting slot, and there is also a step difference b between the root of the second magnetic block and the second magnetic block. The step difference b design avoids interference and damage during the assembly of the first and second rotor core sections due to tolerance issues affecting the magnetic block.

[0012] Preferably, the step difference b is greater than 1 mm.

[0013] The beneficial effects of this utility model are: it eliminates the problem of magnetic pull from one side, ensuring that the rotor assembly will not be affected by magnetic pull in one direction and thus will not oscillate; it improves structural stability; and it avoids the situation where interference occurs when the first rotor core section and the second rotor core section are assembled due to the tolerance of the magnetic block, resulting in damage. Attached Figure Description

[0014] Figure 1 It is a theoretical assembly drawing of the rotor assembly and the stator assembly; Figure 2 This is the actual assembly drawing of the rotor assembly and stator assembly; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the structure of this utility model; Figure 5 This is an assembly drawing of the rotor assembly and stator assembly in this utility model. Figure 6 yes Figure 5 Enlarged view of point B in the middle; Figure 7 This is a front view of the rotor assembly in this utility model; Figure 8 This is an internal structural diagram of the rotor assembly in this utility model; Figure 9 yes Figure 7 A three-dimensional view of the first rotor core section.

[0015] In the diagram: 1. Housing, 2. Stator core, 3. Copper wire winding, 4. Rotor core, 5. Magnetic block, 6. First rotor core section, 7. Second rotor core section, 8. First magnetic block holder, 9. Second magnetic block holder, 10. First magnetic block, 11. Second magnetic block, 12. Magnetic block limiting boss, 13. First magnetic block mounting slot, 14. Second magnetic block mounting slot, 15. Shaft. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] like Figures 4-9 In the embodiments described above, a magnetically stabilized motor structure includes: Casing 1; The stator assembly is fixed inside the housing 1. The stator assembly includes a stator core 2, on which a copper wire winding 3 is provided. The rotor assembly is located inside the stator core 2 and the two are rotatably connected. The rotor assembly includes a rotor core 4, the length of which is greater than the length of the stator core 2. The end faces of both ends of the rotor core 4 extend beyond the end faces of both ends of the stator core 2 and the extension lengths at both ends are equal. A magnetic block 5 is provided on the rotor core 4, and the end faces of both ends of the magnetic block 5 also extend beyond the end faces of both ends of the stator core 2 and the extension lengths at both ends are equal.

[0018] A rotating shaft 15 is installed on the inner side of the housing 1. The rotating shaft 15 is rotatably connected to the housing 1, and the rotor assembly is fixed on the rotating shaft 15.

[0019] like Figures 7-9 As shown, the rotor core 4 is composed of a first rotor core segment 6 and a second rotor core segment 7 fixedly connected to each other. A first magnetic block holder 8 is fixed on the first rotor core segment 6, and a second magnetic block holder 9 is fixed on the second rotor core segment 7. The magnetic block 5 includes a first magnetic block 10 fixed on the first magnetic block holder 8 and a second magnetic block 11 fixed on the second magnetic block holder 9. The end face of the first rotor core segment 6 away from the second rotor core segment 7 extends 0.5 mm beyond the end face of one end of the stator core 2. The end face of the second rotor core segment 7 away from the first rotor core segment 6 also extends 0.5 mm beyond the end face of the other end of the stator core 2. The end face of the first magnetic block 10 away from the second rotor core segment 7 extends beyond the end face a length of one end of the stator core 2. The end face of the second magnetic block 11 away from the first rotor core segment 6 also extends beyond the end face a length of the other end of the stator core 2.

[0020] The length of a is greater than 1 mm and less than or equal to 5 mm.

[0021] Both the first magnetic block holder 8 and the second magnetic block holder 9 are fixed with magnetic block limiting bosses 12, which are positioned between the first magnetic block holder 8 and the second magnetic block holder 9.

[0022] The first magnetic block holder 8 is provided with a first magnetic block mounting groove 13, the first magnetic block 10 is installed in the first magnetic block mounting groove 13 and there is a step difference b between the root of the first magnetic block mounting groove 13 and the first magnetic block 10. The second magnetic block holder 9 is provided with a second magnetic block mounting groove 14, the second magnetic block 11 is installed in the second magnetic block mounting groove 14 and there is also a step difference b between the root of the second magnetic block mounting groove 14 and the second magnetic block 11.

[0023] The step difference b is greater than 1 mm.

[0024] This invention designs the rotor core to be 1mm higher than the stator core, ensuring that both ends of the magnetic block extend beyond the two ends of the stator core by a length (1mm < a ≤ 5mm). This results in both ends of the rotor assembly being subjected to magnetic pull from the magnetic block in opposite directions, thus eliminating the problem of magnetic pull from one side and ensuring that the rotor assembly will not oscillate due to magnetic pull in one direction.

[0025] The magnetic block limiting bosses 12 on the first magnetic block holder 8 and the second magnetic block holder 9 can keep the first magnetic block 10 and the second magnetic block 11 stably beyond the two end faces of the stator core.

[0026] By designing a step difference b (b > 1 mm), the interference and damage that would occur when the first rotor core section and the second rotor core section are assembled due to the influence of tolerance on the magnetic block are avoided.

Claims

1. A magnetically pulled, stable motor structure, characterized in that, include: Casing (1); The stator assembly is fixed inside the housing (1) and includes a stator core (2) on which a copper wire winding (3) is provided. The rotor assembly is located inside the stator core (2) and the two are rotatably connected. The rotor assembly includes a rotor core (4). The length of the rotor core (4) is greater than the length of the stator core (2). The end faces of both ends of the rotor core (4) extend beyond the end faces of both ends of the stator core (2) and the extension lengths at both ends are equal. A magnetic block (5) is provided on the rotor core (4). The end faces of both ends of the magnetic block (5) also extend beyond the end faces of both ends of the stator core (2) and the extension lengths at both ends are equal.

2. The magnetically pulled, stable motor structure according to claim 1, characterized in that, The rotor core (4) is composed of a first rotor core segment (6) and a second rotor core segment (7) fixedly connected to each other. A first magnetic block holder (8) is fixed on the first rotor core segment (6), and a second magnetic block holder (9) is fixed on the second rotor core segment (7). The magnetic block (5) includes a first magnetic block (10) fixed on the first magnetic block holder (8) and a second magnetic block (11) fixed on the second magnetic block holder (9). The end face of the first rotor core segment (6) away from the second rotor core segment (7) exceeds... The end face of the stator core (2) extends 0.5 mm beyond one end of the stator core (2). The end face of the second rotor core segment (7) away from the first rotor core segment (6) also extends 0.5 mm beyond the end face of the other end of the stator core (2). The end face of the first magnetic block (10) away from the second rotor core segment (7) extends a length beyond the end face of one end of the stator core (2). The end face of the second magnetic block (11) away from the first rotor core segment (6) also extends a length beyond the end face of the other end of the stator core (2).

3. The magnetically pulled, stable motor structure according to claim 2, characterized in that, The length of 'a' is greater than 1 mm and less than or equal to 5 mm.

4. The magnetically pulled, stable motor structure according to claim 2, characterized in that, The first magnetic block holder (8) and the second magnetic block holder (9) are each fixed with a magnetic block limiting boss (12), and the magnetic block limiting boss (12) is placed between the first magnetic block holder (8) and the second magnetic block holder (9).

5. A magnetically pulled, stable motor structure according to any one of claims 2-4, characterized in that, The first magnetic block holder (8) is provided with a first magnetic block mounting groove (13), the first magnetic block (10) is installed in the first magnetic block mounting groove (13) and there is a step difference b between the root of the first magnetic block mounting groove (13) and the first magnetic block (10). The second magnetic block holder (9) is provided with a second magnetic block mounting groove (14), the second magnetic block (11) is installed in the second magnetic block mounting groove (14) and there is also a step difference b between the root of the second magnetic block mounting groove (14) and the second magnetic block (11).

6. The magnetically pulled, stable motor structure according to claim 5, characterized in that, The step difference b is greater than 1 mm.

Images