Reluctance motor rotor structure and reluctance motor

Abstract

The utility model discloses a reluctance motor rotor structure and a reluctance motor, the reluctance motor rotor structure is provided with an outer layer magnetic steel groove and an inner layer magnetic steel groove which are arranged in a straight line, and the outer layer magnetic steel groove and the inner layer magnetic steel groove are arranged in parallel along the radial direction of a rotor body. Two parallel linear magnetic circuits are formed on the rotor structure; the outer-layer magnetic steel grooves are located in the sides, away from the shaft hole, of the inner-layer magnetic steel grooves. The problems that an existing reluctance motor is high in cost, and the performance cannot meet the performance requirement are solved.

Description

Technical Field

[0001] This utility model belongs to the field of reluctance motor technology, and more specifically, it relates to a reluctance motor rotor structure and a reluctance motor. Background Technology

[0002] Electricity, as an environmentally friendly, clean, and highly efficient energy source, is widely used in production and daily life. Using electricity to drive the upgrading of transportation vehicles, promoting the low-carbon development of the transportation industry, reducing transportation costs, saving energy, and protecting the environment is a major research topic worldwide. After decades of development, it has been applied in many fields, including electric city buses, electric transport vehicles for factories and mines, electric urban sanitation vehicles, and special vehicles for engineering, tunnel, and subway construction. The drive motors of electric vehicles typically use permanent magnet synchronous reluctance motors. In terms of magnet structure, rare earth magnets are used in large quantities, and currently, the price of rare earth magnets is high, keeping motor costs high.

[0003] However, the rotor magnets of reluctance motors are usually arranged in a V-shape, which results in a large number of magnets, high cost, and insufficient resistance to demagnetization. In addition, due to the unreasonable magnetic circuit distribution, the reluctance torque of existing reluctance motors is insufficient, and the high proportion of electromagnetic torque leads to a narrow efficiency range, high cost, and performance that cannot meet the requirements. Utility Model Content

[0004] To address the issues of high cost and insufficient performance of existing reluctance motors, the purpose of this invention is to provide a reluctance motor rotor structure. This rotor structure has an outer layer of magnetic steel slots and an inner layer of magnetic steel slots arranged in a double-line pattern. These slots are arranged parallel to each other radially along the rotor body, forming two parallel linear magnetic circuits on the rotor structure. The outer layer of magnetic steel slots is located on the side of the inner layer of magnetic steel slots furthest from the shaft hole.

[0005] Furthermore, the outer magnetic groove includes a first outer magnetic segment and a second outer magnetic segment inclinedly connected to both sides of the first outer magnetic segment; the inner magnetic groove includes a first inner magnetic segment and a second inner magnetic segment inclinedly connected to both sides of the first inner magnetic segment; wherein, the first outer magnetic segment and the first inner magnetic segment are arranged parallel to each other, and the side of the first outer magnetic segment away from the shaft hole protrudes to form a first protrusion; the side of the first inner magnetic segment away from the shaft hole protrudes to form a second protrusion.

[0006] Furthermore, the two second outer magnet segments extend outward in a manner away from the shaft hole; the second outer magnet segments have opposing first end faces and second end faces along their extension direction, the first end face being the end face of the second outer magnet segment closer to the first outer magnet segment; wherein, the first end face and the second end face are not parallel.

[0007] Furthermore, the outward expansion angle α1 formed by the two first end faces is less than the outward expansion angle α2 formed by the two second end faces.

[0008] Furthermore, the two second inner magnet segments extend outward toward the side away from the shaft hole; the second inner magnet segments have opposing third and fourth end faces along their extension direction, the third end face being the end face of the second inner magnet segment closest to the first inner magnet segment; wherein, the third end face is parallel to the fourth end face.

[0009] Furthermore, the expansion angle α3 formed by the two third end faces is equal to the expansion angle α2 formed by the two second end faces.

[0010] Furthermore, the distance d5 between the adjacent third end face and the second end face is 3.8mm ± 0.02mm.

[0011] Furthermore, the thickness d1 of the first outer magnetic steel segment is greater than the thickness d2 of the first inner magnetic steel segment.

[0012] Furthermore, the thickness d3 of the first protrusion is equal to the thickness d4 of the second protrusion.

[0013] Furthermore, the thickness d6 of the second inner magnetic steel segment is greater than the thickness d2 of the first inner magnetic steel segment.

[0014] Furthermore, this utility model provides a reluctance motor that uses any of the reluctance motor rotor structures described above.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] By modifying the rotor structure, changing the magnet slots from a "V-" shape to a double-I-shape, the rotor magnets can be adjusted from a "V-" shape to a "double-I-shape," thereby optimizing the magnetic circuit distribution and increasing the proportion of reluctance torque. This makes the reluctance torque proportion greater than the electromagnetic torque, and thus, while maintaining the original stator core and stator winding structure, significantly increases the speed of the reluctance motor, achieving an expanded high-efficiency area. Compared to the "V-" shaped double-layer magnet structure, the double-I-shape magnet arrangement reduces the amount of magnets used and improves demagnetization resistance, thereby improving the performance of the reluctance motor while reducing costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the rotor structure of a reluctance motor provided by this utility model;

[0018] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 yes Figure 2 Dimensioning diagram.

[0020] In the figure: 100, rotor body; 10, outer magnet slot; 11, first outer magnet segment; 12, second outer magnet segment; 13, first protrusion; 20, inner magnet slot; 21, first inner magnet segment; 22, second inner magnet segment; 23, second protrusion; 30, shaft hole; 31, motor shaft. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0022] See Figure 1 This is a structural schematic diagram of a reluctance motor rotor structure provided by this utility model. Combined with... Figures 1 to 3 The rotor structure of this reluctance motor has an outer layer of magnetic steel slots 10 and an inner layer of magnetic steel slots 20 arranged in a double-I-shape. The outer layer of magnetic steel slots 10 and the inner layer of magnetic steel slots 20 are arranged parallel to each other radially along the rotor body 100, forming two parallel I-shaped magnetic circuits on the rotor body 100. The outer layer of magnetic steel slots 10 are located on the side of the inner layer of magnetic steel slots 20 away from the shaft hole 30. The arrangement of the magnetic steel slots makes the reluctance torque ratio greater than the electromagnetic torque.

[0023] Understandably, by modifying the rotor structure, changing the magnet slots from a "V-" shape to a double-I-shape, the rotor magnets can be adjusted from a "V-" shape to a "double-I-shape," thereby optimizing the magnetic circuit distribution and increasing the proportion of reluctance torque. This makes the reluctance torque proportion greater than the electromagnetic torque, and thus, while maintaining the original stator core and stator winding structure, significantly increases the speed of the reluctance motor, achieving an expanded high-efficiency area. The high-efficiency area refers to the area covered by the motor's efficiency value within its high-efficiency operating region. A larger area indicates that the motor can maintain high efficiency over a wider load range, thereby improving overall energy efficiency and operating economy. Furthermore, compared to the "V-" shaped double-layer magnet structure, the double-I-shape magnet arrangement reduces the amount of magnets used and improves demagnetization resistance.

[0024] In one specific embodiment, based on the 122 motor, the original stator core and stator winding structure are maintained, only the rotor structure is changed, and the rotor magnets are adjusted from a "V-" shape to a "double I-shape" shape to obtain the 122CZ motor. The 122CZ-60H motor has a line back electromotive force of only 13.2V / 1000rpm, a no-load speed of 5450rpm under 72V without field weakening, and the speed can be increased to 7000rpm after field weakening; compared with the base speed of the 122-60H motor, the speed of the 122CZ motor can be increased by nearly 1000rpm. In addition, the 122CZ motor can reduce the amount of magnets used by 10% compared with the 122 motor, but has stronger resistance to demagnetization than the 122 motor.

[0025] Furthermore, the outer magnetic groove 10 includes a first outer magnetic segment 11 and a second outer magnetic segment 12 inclinedly connected to both sides of the first outer magnetic segment 11; the inner magnetic groove 20 includes a first inner magnetic segment 21 and a second inner magnetic segment 22 inclinedly connected to both sides of the first inner magnetic segment 21; wherein, the first outer magnetic segment 11 and the first inner magnetic segment 21 are arranged parallel to each other, and the side of the first outer magnetic segment 11 away from the shaft hole 30 protrudes to form a first protrusion 13; the side of the first inner magnetic segment 21 away from the shaft hole 30 protrudes to form a second protrusion 23.

[0026] It is understandable that by setting a protrusion on the side of the first outer magnet segment 11 away from the shaft hole 30 to form a first protrusion 13, and setting a protrusion on the side of the first inner magnet segment 21 away from the shaft hole 30 to form a second protrusion 23, the path distribution of magnetic flux can be changed through the first protrusion 13 and the second protrusion 23. The local high magnetic reluctance region formed by the protrusion will force the magnetic flux to bypass the protrusion, increasing the tortuosity of the q-axis (quasi-axis) magnetic circuit, thereby significantly increasing the difference in inductance between the quadrature and direct axes (Lq-LdLq-Ld) and increasing the proportion of magnetic reluctance torque. In addition, the protrusion structure can act as a limiting device for the magnet, preventing the magnet from displacing outward due to centrifugal force during high-speed rotation, further improving the anti-demagnetization capability.

[0027] Furthermore, the two second outer magnet segments 12 extend outward toward the side away from the shaft hole 30; the second outer magnet segment 12 has a first end face and a second end face opposite to each other along its extension direction, the first end face being the end face of the second outer magnet segment 12 close to the first outer magnet segment 11; wherein the first end face and the second end face are not parallel.

[0028] It is understandable that, compared to setting a rectangular magnet groove in the second outer magnet section 12, setting a trapezoidal groove with the first end face not parallel to the second end face can further optimize the magnetic circuit distribution, enhance the proportion of magnetic reluctance torque, and further improve the anti-demagnetization capability.

[0029] Furthermore, the outward expansion angle α1 formed by the two first end faces is less than the outward expansion angle α2 formed by the two second end faces. For example, the outward expansion angle α1 formed by the two first end faces is 33.2°±0.1°; the outward expansion angle α2 formed by the two second end faces is 45°±0.1°.

[0030] Furthermore, the two second inner magnet segments 22 extend outwards towards the side away from the shaft hole 30; the second inner magnet segment 22 has opposing third and fourth end faces along its extension direction, the third end face being the end face of the second inner magnet segment 22 closest to the first inner magnet segment 21; wherein, the third end face is parallel to the fourth end face. It is understood that by setting the third end face to be parallel to the fourth end face, a rectangular magnet groove can be formed in the second inner magnet segment 22. Compared to setting both the second outer magnet segment 12 and the second inner magnet segment 22 as trapezoidal grooves, this approach can optimize the magnetic circuit distribution and production costs.

[0031] Furthermore, the outward expansion angle α3 formed by the two third end faces is equal to the outward expansion angle α2 formed by the two second end faces. In terms of distance, the outward expansion angle α3 formed by the two third end faces is 45°±0.1°; the outward expansion angle α2 formed by the two second end faces is 45°±0.1°.

[0032] Furthermore, the distance d5 between the adjacent third end face and the second end face is 3.8mm ± 0.02mm.

[0033] Furthermore, the thickness d1 of the first outer magnet segment 11 is greater than the thickness d2 of the first inner magnet segment 21. For example, the thickness d1 of the first outer magnet segment 11 ranges from 2.70mm to 2.77mm, and the thickness d2 of the first inner magnet segment 21 ranges from 2.40mm to 2.47mm.

[0034] Furthermore, the thickness d3 of the first protrusion 13 is equal to the thickness d4 of the second protrusion 23. For example, the thickness d3 of the first protrusion 13 is 0.4 mm; the thickness d4 of the second protrusion 23 is 0.4 mm.

[0035] Furthermore, the thickness d6 of the second inner magnet segment 22 is greater than the thickness d2 of the first inner magnet segment 21. For example, the thickness d6 of the second inner magnet segment 22 is 2.6mm ± 0.02mm. The thickness d2 of the first inner magnet segment 21 ranges from 2.40mm to 2.47mm.

[0036] Furthermore, this application provides a reluctance motor that uses any of the reluctance motor rotor structures described above and achieves the same effect; to avoid repetition, it will not be described again here.

[0037] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A reluctance motor rotor structure, characterized by, The reluctance motor rotor structure is provided with double one-word arranged outer layer magnetic steel grooves (10) and inner layer magnetic steel grooves (20), the outer layer magnetic steel grooves (10) and the inner layer magnetic steel grooves (20) are arranged in parallel along the radial direction of the rotor body (100), forming two parallel one-word magnetic circuits on the rotor body (100); wherein the outer layer magnetic steel grooves (10) are located on the side of the inner layer magnetic steel grooves (20) away from the shaft hole (30).

2. A reluctance motor rotor structure according to claim 1, characterised in that, The outer layer magnetic steel grooves (10) include first outer layer magnetic steel segments (11) and second outer layer magnetic steel segments (12) obliquely connected on both sides of the first outer layer magnetic steel segments (11); the inner layer magnetic steel grooves (20) include first inner layer magnetic steel segments (21) and second inner layer magnetic steel segments (22) obliquely connected on both sides of the first inner layer magnetic steel segments (21); wherein the first outer layer magnetic steel segments (11) are arranged in parallel with the first inner layer magnetic steel segments (21), and a first protruding portion (13) is formed on the side of the first outer layer magnetic steel segments (11) away from the shaft hole (30); a second protruding portion (23) is formed on the side of the first inner layer magnetic steel segments (21) away from the shaft hole (30).

3. A reluctance motor rotor structure according to claim 2, characterised in that, The two second outer layer magnetic steel segments (12) extend outwardly toward the side away from the shaft hole (30); the second outer layer magnetic steel segments (12) have opposite first end faces and second end faces along their extension direction, and the first end face is the end face of the second outer layer magnetic steel segment (12) close to the first outer layer magnetic steel segment (11); wherein the first end face is not parallel to the second end face.

4. A reluctance motor rotor structure according to claim 3, characterised in that, The outward expansion angle α1 formed by the two first end faces is less than the outward expansion angle α2 formed by the two second end faces.

5. The magnetoresistive motor rotor structure of claim 3 wherein, The two second inner layer magnetic steel segments (22) extend outwardly toward the side away from the shaft hole (30); the second inner layer magnetic steel segments (22) have opposite third end faces and fourth end faces along their extension direction, and the third end face is the end face of the second inner layer magnetic steel segment (22) close to the first inner layer magnetic steel segment (21); wherein the third end face is parallel to the fourth end face.

6. A reluctance motor rotor structure according to claim 5, characterised in that, The outward expansion angle α3 formed by the two third end faces is equal to the outward expansion angle α2 formed by the two second end faces.

7. A reluctance motor rotor structure according to claim 5, characterised in that, The distance d5 between the adjacent third end face and the second end face is 3.8mm±0.02mm.

8. The magnetoresistive motor rotor structure of claim 2, wherein, The thickness d1 of the first outer layer magnetic steel segment (11) is greater than the thickness d2 of the first inner layer magnetic steel segment (21).

9. The magnetoresistive motor rotor structure of claim 2, wherein, The thickness d3 of the first protruding portion (13) is equal to the thickness d4 of the second protruding portion (23).

10. The magnetor impeller structure of claim 2 wherein, The thickness d6 of the second inner layer magnetic steel segment (22) is greater than the thickness d2 of the first inner layer magnetic steel segment (21).

11. A reluctance machine characterized by The reluctance motor rotor structure as claimed in any one of claims 1-10.

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