Rotor for an asynchronous start reluctance motor, asynchronous start reluctance motor

Abstract

The application provides an asynchronous starting reluctance motor rotor and an asynchronous starting reluctance motor, wherein the asynchronous starting reluctance motor rotor comprises a core body, an outer peripheral edge region of the core body is provided with a squirrel cage structure, a shaft hole is arranged on a middle region of the core body, a plurality of air magnetic separation grooves are symmetrically arranged about the center of the shaft hole and are spaced along the q-axis of the rotor, and a plurality of support holes penetrating through both ends of the core body are further arranged on the middle region of the core body, and a support magnetic separation strip is inserted into each of the support holes. According to the application, a plurality of support magnetic separation strips are arranged on the middle region of the core body, so that the anti-deformation ability of the corresponding part is improved, the core body can withstand the radial impact force generated in the operation process of the rotor, the quality of the rotor is improved, and the motor failure rate caused by the deformation of the core is reduced.

Description

Technical Field

[0001] This invention belongs to the field of motor design technology, specifically relating to an asynchronous starting reluctance motor rotor and an asynchronous starting reluctance motor. Background Technology

[0002] Currently, asynchronous starting reluctance motors are implemented using a squirrel cage with air-insulated magnetic slots. Since this type of motor is basically a two-pole motor with the rotor magnetic poles symmetrically distributed at 180°, the magnetic slots are mostly semi-circular arcs bent outwards due to space constraints, and their initial positions are also distributed at 180°. This distribution shape of the air-insulated magnetic slots causes the rotor to have good mechanical strength only in the direction of the iron core magnetic circuit (that is, the guiding direction of the magnetic flux path, which can also be understood as the d-axis of the rotor). However, in the direction of the magnetic slot distribution (which can also be understood as the q-axis of the rotor), since it is impossible to guarantee the absolute symmetry of the magnetic circuit inside the motor iron core and the pump body resistance torque fluctuation, the rotor will be subjected to a large radial impact force. The corresponding position of the air-insulated magnetic slot is air, and the overall mechanical strength of the rotor in this direction is deteriorated, causing the defect rate to soar and serious production failures. During motor operation, the iron core deformation leads to a high motor failure rate. Summary of the Invention

[0003] Therefore, the present invention provides an asynchronous starting reluctance motor rotor and an asynchronous starting reluctance motor, which can solve the technical problems in the prior art where the mechanical strength of the asynchronous starting reluctance motor rotor in the q-axis direction is poor, the rotor will be subjected to large radial impact force during motor operation, resulting in large deformation of the rotor on the q-axis, and the core deformation during motor operation leads to a high failure rate of the motor.

[0004] To address the aforementioned problems, the present invention provides an asynchronous starting reluctance motor rotor, comprising an iron core body, wherein a squirrel cage structure is provided on the outer peripheral region of the iron core body, and a shaft hole and a plurality of air magnetic isolation slots are provided symmetrically about the shaft hole and spaced apart along the q-axis of the rotor in the middle region of the iron core body, and a plurality of support holes penetrating both ends of the iron core body are also provided in the middle region of the iron core body, wherein a support magnetic isolation strip is inserted into each of the support holes.

[0005] In some embodiments, the air magnetic isolation groove includes a first groove segment and a second groove segment arranged sequentially at intervals along the d-axis direction of the rotor, and the supporting magnetic isolation strip is located between the first groove segment and the second groove segment.

[0006] In some embodiments, the first slot segment and the second slot segment are symmetrical about the q-axis.

[0007] In some embodiments, the supporting magnetic shielding strip is symmetrical about the q-axis.

[0008] In some embodiments, the outer diameter of the core body is D, the cross-section of the supporting magnetic shielding strip is rectangular, the height of the supporting magnetic shielding strip in the q-axis direction is H, the length in the d-axis direction is L, and 2≥D / H≥20 and 0.5≥H / L≥2.

[0009] In some embodiments, the supporting magnetic strip is made of aluminum.

[0010] In some embodiments, the cage structure includes end rings located at both ends of the iron core body and a guide bar connecting the two end rings. One end of the magnetically insulating support bar is connected to one of the two end rings via a radial connection, and the other end of the magnetically insulating support bar is air-isolated from the other of the two end rings.

[0011] In some embodiments, the supporting magnetic shielding strip is integrally cast with the mouse cage structure.

[0012] In some embodiments, the axial thickness of the radial connection portion is L1, and the height of the end ring corresponding to the radial connection portion protruding from the radial connection portion along the axial direction of the core body is L2, where 2mm≤L1≤10mm and L2≥2mm.

[0013] The present invention also provides an asynchronous starting reluctance motor, including the aforementioned asynchronous starting reluctance motor rotor.

[0014] The present invention provides an asynchronous starting reluctance motor rotor and an asynchronous starting reluctance motor. By setting multiple supporting magnetic isolation strips in the middle area of ​​the iron core body, the deformation resistance of the corresponding part can be improved, and the iron core body can withstand the radial impact force generated during the rotor operation, thereby improving the quality of the rotor and reducing the motor failure rate caused by iron core deformation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the axial projection of the rotor of the asynchronous starting reluctance motor according to an embodiment of the present invention;

[0016] Figure 2 for Figure 1 A three-dimensional structural diagram of the mouse cage structure and the supporting magnetic strips from one perspective.

[0017] Figure 3 for Figure 1 A three-dimensional schematic diagram of the mouse cage structure and the supporting magnetic strip from another perspective;

[0018] Figure 4 This is a schematic diagram of the longitudinal section of the rotor of the asynchronous starting reluctance motor according to an embodiment of the present invention.

[0019] The reference numerals in the attached figures are as follows:

[0020] 1. Iron core body; 2. Supporting magnetic shielding strip; 21. Radial connection part; 3. Air magnetic shielding groove; 31. First groove segment; 32. Second groove segment; 4. Shaft hole; 51. End ring; 52. Guide bar. Detailed Implementation

[0021] See also Figures 1 to 4 As shown, according to an embodiment of the present invention, an asynchronous starting reluctance motor rotor is provided, including a core body 1. A squirrel cage structure (not indicated in the figure) is provided on the outer periphery of the core body 1. The middle region of the core body 1 has a shaft hole 4 and a plurality of air-insulating slots 3 arranged symmetrically about the shaft hole 4 and spaced along the q-axis of the rotor. The middle region of the core body 1 also has a plurality of support holes penetrating both ends of the core body 1, and a support magnetic strip 2 is inserted into each support hole. It is understood that the aforementioned outer periphery surrounds the aforementioned middle region. In this technical solution, by providing multiple support magnetic strips 2 on the middle region of the core body 1, the corresponding deformation resistance can be improved, enabling the core body 1 to withstand the radial impact force generated during rotor operation, thereby improving the rotor's quality and reducing the motor failure rate due to core deformation. It is understood that this also ensures the production quality of the motor during the manufacturing process.

[0022] It should be noted that the area between two adjacent air magnetic isolation slots 3 forms a magnetic flux path. The aforementioned supporting magnetic isolation strip 2 can be placed in this area, which can improve the deformation resistance of the iron core body 1. However, placing the supporting magnetic isolation strip 2 in this area will have a certain obstruction effect on the magnetic circuit, which will reduce the performance of the motor to some extent. As a preferred embodiment, the air magnetic isolation slot 3 includes a first slot segment 31 and a second slot segment 32 arranged sequentially along the d-axis direction of the rotor. The supporting magnetic isolation strip 2 is located between the first slot segment 31 and the second slot segment 32, that is, the supporting magnetic isolation strip 2 is not placed in the magnetic flux path area. Therefore, it is possible to reduce the deformation resistance of the rotor as much as possible while improving the deformation resistance of the rotor. To minimize the adverse effects on the magnetic circuit, it is important to note that by providing a supporting magnetic shielding strip 2 between the first slot segment 31 and the second slot segment 32, the width of the magnetic shielding bridge formed between the two slot segments and the supporting magnetic shielding strip 2 can be designed to be as small as possible. This minimizes the serial connection between two adjacent magnetic flux paths. In a preferred embodiment, the width of the aforementioned magnetic shielding bridge can be 0, meaning that the supporting hole is connected to both the first slot segment 31 and the second slot segment 32. In other words, the supporting magnetic shielding strip 2 is inserted into the air magnetic shielding slot 3. This technical solution can eliminate the serial connection of magnetic circuits between two adjacent magnetic flux paths to the greatest extent possible, and the supporting hole allows for convenient and reliable positioning of the supporting magnetic shielding strip 2. Preferably, the first slot segment 31 and the second slot segment 32 are symmetrical about the q-axis. Based on this, the supporting magnetic shielding strip 2 is also symmetrical about the q-axis, ensuring the symmetry of the magnetic circuit. It should be noted that the two sides of the supporting magnetic shielding strip 2 are the first slot section 31 and the second slot section 32, respectively, which reduces the induced voltage of the supporting magnetic shielding strip 2 and ensures that the rotor aluminum bar loss will not increase significantly, thereby affecting the motor efficiency.

[0023] In some embodiments, the outer diameter of the core body 1 is D, the cross-section of the supporting magnetic shielding strip 2 is rectangular, the profile of the supporting hole matches the cross-sectional shape of the supporting magnetic shielding strip 2, the height of the supporting magnetic shielding strip 2 in the d-axis direction is H, and the length in the q-axis direction is L, where 2≥D / H≥20 and 0.5≥H / L≥2, so that the size of the supporting magnetic shielding strip 2 is adapted to the size of the core body 1, ensuring that it has a strong supporting effect. In some cases, the shape of the cross-section of the supporting magnetic shielding strip 2 can be other feasible shapes, but using a rectangular shape makes the corresponding supporting hole and the manufacturing of the supporting magnetic shielding strip 2 simpler and more convenient. The aforementioned rectangle can be rounded at its four corners during specific manufacturing.

[0024] Understandably, the material of the supporting magnetic shielding strip 2 is a magnetic shielding material, such as aluminum or copper. Since the material of the squirrel cage structure is mostly aluminum, in order to facilitate the processing of the rotor, the material of the supporting magnetic shielding strip 2 is the same as that of the squirrel cage structure, that is, aluminum. In this way, the supporting magnetic shielding strip 2 and the squirrel cage structure can be cast as one piece.

[0025] See details Figures 3 to 4 As shown, the squirrel cage structure includes end rings 51 located at both ends of the iron core body 1 and a guide bar 52 connecting the two end rings 51. One end of the supporting magnetic shielding bar 2 is connected to one of the two end rings 51 through a radial connecting part 21, and the other end of the supporting magnetic shielding bar 2 is air-isolated from the other end ring 51. That is, one end of the supporting magnetic shielding bar 2 is connected to the end ring 51, while the other end is not connected to the end ring 51. This design allows the squirrel cage structure and the supporting magnetic shielding bar 2 to be processed in one step during the rotor aluminum casting process, while also blocking the forming circuit of the supporting magnetic shielding bar 2, thus ensuring the motor's energy efficiency.

[0026] In some embodiments, the axial thickness of the radial connection portion 21 is L1, and the end ring 51 corresponding to the radial connection portion 21 protrudes from the radial connection portion 21 along the axial direction of the iron core body 1 by a height of L2, where 2mm≤L1≤10mm and L2≥2mm. This design helps to ensure that the magnetic shielding strip 2 and the squirrel cage are fully cast during the production process, reducing voids, and at the same time reducing the influence of the eddy current of the squirrel cage end ring on the magnetic shielding strip 2.

[0027] According to an embodiment of the present invention, an asynchronous starting reluctance motor is also provided, including the asynchronous starting reluctance motor rotor described above.

[0028] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0029] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An asynchronous starting reluctance motor rotor, comprising an iron core body (1), wherein a squirrel cage structure is provided on the outer peripheral region of the iron core body (1), and the middle region of the iron core body (1) has a shaft hole (4) and a plurality of air-insulating slots (3) arranged symmetrically about the shaft hole (4) and spaced apart along the q-axis of the rotor, characterized in that, The iron core body (1) also has a plurality of support holes in the middle region that pass through both ends of the iron core body (1), and a support magnetic shielding strip (2) is inserted into each of the support holes; the cage structure includes end rings (51) located at both ends of the iron core body (1) and a guide strip (52) connecting the two end rings (51). One end of the support magnetic shielding strip (2) is connected to one of the two end rings (51) through a radial connecting part (21), and the other end of the support magnetic shielding strip (2) forms an air gap with the other of the two end rings (51); the end ring (51) corresponding to the radial connecting part (21) protrudes from the radial connecting part (21) along the axial direction of the iron core body (1); the radial connecting part (21) is located on the radial inner ring surface of the end ring (51), and each support magnetic shielding strip (2) is located on the radial inner side of the radial inner ring surface of each end ring (51).

2. The asynchronous starting reluctance motor rotor according to claim 1, characterized in that, The air magnetic isolation groove (3) includes a first groove segment (31) and a second groove segment (32) arranged sequentially at intervals along the d-axis direction of the rotor, and the supporting magnetic isolation strip (2) is located between the first groove segment (31) and the second groove segment (32).

3. The asynchronous starting reluctance motor rotor according to claim 2, characterized in that, The first groove segment (31) and the second groove segment (32) are symmetrical about the q-axis.

4. The asynchronous starting reluctance motor rotor according to claim 3, characterized in that, The supporting magnetic strip (2) is symmetrical about the q-axis.

5. The rotor of the asynchronous starting reluctance motor according to any one of claims 1 to 4, characterized in that, The material of the supporting magnetic strip (2) is aluminum.

6. The asynchronous starting reluctance motor rotor according to claim 5, characterized in that, The supporting magnetic shielding strip (2) is integrally cast with the rat cage structure.

7. The asynchronous starting reluctance motor rotor according to claim 1, characterized in that, The axial thickness of the radial connecting part (21) is L1, and the height of the end ring (51) corresponding to the radial connecting part (21) protruding from the radial connecting part (21) along the axial direction of the iron core body (1) is L2, 2mm≤L1≤10mm, L2≥2mm.

8. An asynchronous starting reluctance motor, characterized in that, The rotor of the asynchronous starting reluctance motor includes any one of claims 1 to 7.

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