Motor rotor and self-starting synchronous reluctance motor and compressor

Abstract

The application provides a motor rotor, a self-starting synchronous reluctance motor, a compressor and a motor rotor. The motor rotor has a slit slot, a second filling slot and a first filling slot on a first rotor lamination. An outer magnetic barrier layer includes the first filling slot, and an inner magnetic barrier layer includes the slit slot and the second filling slot at both ends of the slit slot. Between the second filling slot and the slit slot in the same layer of the inner magnetic barrier layer, there is a separation rib. A side of the separation rib close to an outer circle of the rotor has a center point in an axial plane. The distance between two center points corresponding to two separation ribs in any two adjacent layers of magnetic barrier layers along a d-axis direction is L. The maximum distance between the filling slots in the two adjacent layers of magnetic barrier layers along a q-axis direction is W, and 0<=L<2W. According to the application, the saturation degree of the magnetic conduction channel between the filling slots can be reduced, the motor harmonics can be reduced, the torque ripple can be reduced, the harmonic loss can be reduced, the motor efficiency and the operation stability can be improved.

Description

Technical Field

[0001] This invention belongs to the field of motor design technology, specifically relating to a motor rotor and its self-starting synchronous reluctance motor and compressor. Background Technology

[0002] Self-starting synchronous reluctance motors combine the advantages of asynchronous motors with those of synchronous reluctance motors. They achieve self-starting through asynchronous torque generated by the rotor bars, eliminating the need for a frequency converter. Compared to asynchronous motors, they offer constant speed operation, lower rotor losses, and improved efficiency during synchronous operation. Compared to asynchronous-starting permanent magnet synchronous motors, they do not use permanent magnets, resulting in lower costs and eliminating the demagnetization problem associated with permanent magnets. However, the multi-layered magnetic barrier structure of self-starting synchronous reluctance motors leads to a higher level of harmonic distortion. Summary of the Invention

[0003] Therefore, the present invention provides a motor rotor and its self-starting synchronous reluctance motor and compressor, which can overcome the shortcomings of the self-starting synchronous reluctance motor in the related art, which has a multi-layer magnetic barrier structure on the motor rotor, resulting in large harmonics in the motor.

[0004] To address the aforementioned problems, this invention provides a motor rotor, comprising a first rotor lamination. The first rotor lamination has a filling groove and a slit groove. The filling groove includes a second filling groove and a first filling groove. The first rotor lamination is provided with multiple magnetic barrier layers spaced along its q-axis. The multiple magnetic barrier layers include two outer magnetic barrier layers and multiple inner magnetic barrier layers located between the two outer magnetic barrier layers. The outer magnetic barrier layers include the first filling groove, and the inner magnetic barrier layers include the slit groove and the second filling grooves located at both ends of the slit groove. Within the same inner magnetic barrier layer, there is a dividing rib between the second filling groove and the slit groove. The plane containing the axial side of the dividing rib near the outer circle of the rotor has a center point. The distance between the two center points corresponding to the two dividing ribs in any two adjacent magnetic barrier layers along the d-axis is L. The maximum distance along the q-axis of the magnetic conductive channel formed between the filling grooves in the two adjacent magnetic barrier layers is W, where 0 ≤ L < 2W.

[0005] In some implementations, 0 ≤ L < W.

[0006] In some implementations, 0 ≤ L ≤ 0.8 W.

[0007] In some implementations, when the rotor core is assembled with the corresponding stator core, the width of the air gap formed between the rotor core and the stator core is σ, where 0 ≤ L < 8σ.

[0008] In some implementations, 0 ≤ L ≤ 6σ.

[0009] In some embodiments, the width of the dividing rib in the inner magnetic barrier layer adjacent to the first filling groove in the d-axis direction is L1, the first rotor lamination has a shaft hole, and the width of the dividing rib in the inner magnetic barrier layer adjacent to the shaft hole in the d-axis direction is L2, where L1 is not less than L2 and L1≥0.5*σ.

[0010] In some embodiments, there is a center point in the plane of the axial direction of the side edge of the dividing rib near the outer circle of the rotor. The distance between the two center points corresponding to the dividing rib of the outermost magnetic barrier layer near the outer circle of the rotor and the dividing rib of the adjacent magnetic barrier layer along the d-axis is k7; the distance between the two center points corresponding to the dividing rib of the outermost magnetic barrier layer near the outer circle of the rotor and the dividing rib of the innermost magnetic barrier layer near the rotor shaft hole along the d-axis is k8. Then 0≤k7 / k8≤0.6.

[0011] In some embodiments, the filling groove is located on the outer periphery of the rotor, the spacing between the filling groove of the innermost magnetic barrier layer near the shaft hole side and the outer circle of the rotor is L3, and the spacing between the filling groove of the outermost magnetic barrier layer near the outer circle of the rotor and the outer circle of the rotor is L4, where L4≥L3 and 0≤L3≤2.5σ.

[0012] In some embodiments, the maximum width of the end of the filling groove near the outer circle of the rotor along the q-axis is not greater than the maximum width of the region of the filling groove near the q-axis of the rotor along the q-axis.

[0013] In some implementations, the width deviation of the filling groove along the q-axis from the outer circle side of the rotor to the q-axis of the rotor is no more than 5%.

[0014] In some implementations, the ratio between the maximum and minimum width of the filling groove in the q-axis direction is τ, where 1 ≤ τ ≤ 2.

[0015] In some embodiments, the maximum width of the second filling groove in each inner magnetic barrier layer gradually increases along the d-axis direction towards the d-axis.

[0016] In some embodiments, the maximum width of each second filling groove along the d-axis direction increases continuously for at least three layers towards the direction closer to the d-axis; and / or, the maximum width of each second filling groove along the d-axis direction decreases continuously from the inner magnetic barrier layer of the second layer closer to the d-axis to the magnetic barrier layer closer to the outer circle of the rotor towards the direction farther from the d-axis.

[0017] In some embodiments, the slit groove is composed of arc segments and / or straight segments. From the shaft hole side to the outer circle side of the rotor, the curvature of the arc segments of the slit groove gradually increases, and the curvature of the outer circle arc of the slit groove in the same layer is greater than that of the inner circle arc. The arc segments protrude away from the shaft hole side. Alternatively, the two ends of the slit groove extend into straight segments along the d-axis direction. The two ends of part or all of the slit groove are parallel to the d-axis, and the width of the slit groove gradually increases from the middle position of the slit groove to both ends.

[0018] In some embodiments, the width of the slit groove in the q-axis direction decreases continuously in at least three layers away from the d-axis; the width of the slit groove in the q-axis is m2, the width of the first filling groove in the q-axis is m1, the sum of the widths of all the slit grooves and the first filling groove in the q-axis is (m1+∑m2), the width from the hole wall of the shaft hole to the outer circle of the first rotor lamination is m3, and (m1+∑m2) / m3=0.2~0.5.

[0019] In some embodiments, from the shaft hole side to the outer circle side of the rotor, the curve length between the ends of each layer of slit grooves near the two second filling grooves gradually decreases, and the curve length of adjacent slit grooves decreases by 5% to 25%.

[0020] In some embodiments, the dividing rib has a minimum width L2 in the d-axis direction, where L2 ≥ 0.5 * σ, and σ is the width of the air gap formed between the rotor core and the stator core.

[0021] In some embodiments, the first rotor lamination has at least five different filling areas among the filling grooves; and / or, the total filling area of ​​the first filling groove and the second filling groove accounts for 30% to 70% of the total area of ​​the first filling groove, the second filling groove and the slit groove.

[0022] In some embodiments, the minimum width of the magnetic channel between two adjacent filling slots in two adjacent magnetic barrier layers is W1, where W1 ≥ d, and d is the minimum width of the magnetic channel between the slit slots in the two adjacent magnetic barrier layers.

[0023] In some implementations, W1 / d > 1.15.

[0024] In some embodiments, the minimum distance along the q-axis between two adjacent slit slots in two adjacent magnetic barrier layers is h1, h1≥1.5h2, where h2 is the minimum width along the q-axis of the magnetic barrier layer with the smaller width of the slit slot in the two adjacent magnetic barrier layers.

[0025] In some embodiments, the width of the first filling groove along the d-axis is smaller than the width along the d-axis between the ends of the two second filling grooves in the adjacent magnetic barrier layer near the slit groove side.

[0026] In some embodiments, the ratio of the distance L5 from the inner wall of the first filling groove to the rotor center in the q-axis direction to the rotor radius Rr satisfies 0.82≤L5 / Rr≤0.96.

[0027] In some embodiments, the ratio of the distance between the sides of the innermost magnetic barrier layers near the shaft hole on the q-axis and the width of the shaft on the q-axis is greater than 1.2; and / or, the ratio of the diameter of the arc segment of the side of the innermost magnetic barrier layer near the shaft hole on the q-axis to the width of the shaft on the q-axis is greater than 2.

[0028] In some embodiments, the maximum thickness of the first filling groove along the q-axis is k, the maximum thickness of the second filling groove in the adjacent magnetic barrier layer along the q-axis is k1, and the minimum thickness of the magnetically conductive channel connected to it along the q-axis is k2, then 1 < k / k1 ≤ 2, and / or 0.8 < k / k2 ≤ 1.6.

[0029] In some implementations, magnetic channels are formed between two adjacent magnetic barrier layers, and the width of each magnetic channel on the q-axis gradually decreases in the direction away from the d-axis.

[0030] In some embodiments, the width of each magnetic channel on the q-axis decreases continuously for at least three layers in the direction away from the d-axis; and / or, a magnetic channel is formed between two adjacent magnetic barrier layers, and for a magnetic channel composed of arc segments and straight segments, the width of the magnetic channel gradually increases from the q-axis to both sides of the q-axis.

[0031] In some implementations, the ratio of the width of the slit groove on the q-axis to the width of the slit groove near the end of the filling groove in each magnetic barrier layer is τ1, and τ1 gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer.

[0032] In some implementations, the ratio of the maximum width of the filling groove along the q-axis to the width of the slit groove along the q-axis in each magnetic barrier layer is τ2, where τ2 > 1.4.

[0033] In some embodiments, in the outer magnetic barrier layer near the outer circle of the rotor, the width along the d-axis between the ends of the two second filling grooves located at both ends of the slit groove on the side near the slit groove is k3; in the inner magnetic barrier layer adjacent to it near the shaft hole, the width along the d-axis between the ends of the two second filling grooves located at both ends of the slit groove on the side near the slit groove is k4, 0.5≤k3 / k4≤1 or 0.5≤k4 / k3≤1.

[0034] In some embodiments, the width along the d-axis between the ends of the two second filling grooves near the outermost slit groove on the rotor outer circle side is k5; the width along the d-axis between the ends of the two second filling grooves near the slit groove on the rotor shaft hole side is k6, then 0.5≤k5 / k6≤1 or 0.5≤k6 / k5≤1.

[0035] In some embodiments, the angle between the two ends of the first filling groove and the line connecting the rotor center is α1, 20°≤α1≤60°; and / or, the number of the first filling grooves is n, n≥1; and / or, the deviation of the parallel angle between the length extension direction of the filling groove and the d-axis does not exceed 5%.

[0036] In some embodiments, the maximum width of the shaft hole on the first rotor lamination in the q-axis direction is not greater than its maximum width in the d-axis direction; and / or, the shaft hole is composed of arc segments and / or straight segments.

[0037] In some embodiments, the rotor core further includes a second rotor lamination disposed between the end ring and the first rotor lamination, and the second rotor lamination has a connecting groove corresponding to the filling groove.

[0038] In some embodiments, the maximum width of the outer contour of the second rotor lamination is not greater than the outer diameter of the first rotor lamination, the maximum width of the inner hole of the second rotor lamination on the q-axis is not less than its maximum width on the d-axis; and / or, the axial thickness of the second rotor lamination is not less than the thickness of a single first rotor lamination.

[0039] In some embodiments, the ratio of the maximum width of the inner hole of the second rotor lamination on the q-axis to the maximum width on the d-axis is 1 to 1.5.

[0040] In some embodiments, the radial width between the inner hole and the outer circle of the second rotor lamination is minimized on the q axis, and the radial width kd2 of the second rotor lamination on the d axis and its radial width kq2 on the q axis satisfy 1.1≤kd2 / kq2≤2.8.

[0041] In some implementations, 1.2 ≤ kd2 / kq2 ≤ 1.8.

[0042] In some embodiments, the total area of ​​the connecting slots on the second rotor lamination is less than or equal to the total area of ​​the filling slots on the first rotor lamination.

[0043] In some embodiments, the connecting slots on the second rotor lamination are located in the same position as the filling slots on the first rotor lamination, and the area of ​​a single connecting slot on the second rotor lamination is not greater than the area of ​​a single filling slot on the first rotor lamination at the same position.

[0044] In some embodiments, the width of the inner hole of the second rotor lamination and the connecting slot along the d-axis is greater than the width of the dividing rib between the connecting slot and the corresponding slit slot along the d-axis.

[0045] In some embodiments, the total area of ​​the slits on the first rotor lamination located on the inner circumferential side of the inner hole of the second rotor lamination accounts for at least 20% of the total area of ​​the motor flow hole; and / or, the total area of ​​the slits on the first rotor lamination located within the inner hole of the second rotor lamination accounts for at least 30% of the total area of ​​the slits.

[0046] In some embodiments, the total area of ​​the slits on the first rotor lamination located on the inner circumferential side of the inner hole of the second rotor lamination accounts for 25% to 40% of the total area of ​​the motor flow hole; and / or, the total area of ​​the slits on the first rotor lamination located within the inner hole of the second rotor lamination accounts for 45% to 65% of the total area of ​​the slits.

[0047] In some embodiments, from the rotor shaft hole side to the rotor outer circle side, the area of ​​the slit groove in each magnetic barrier layer on the first rotor lamination located on the inner circumferential side of the inner hole of the second rotor lamination gradually decreases.

[0048] In some embodiments, the maximum width of the outer contour of the end ring is not greater than the maximum width of the outer contour of the second rotor lamination, and the maximum distance from the center of the rotor core to the end face of the end ring is not less than the maximum distance from the center of the rotor core to the end face of the second rotor lamination; and / or, the radial width between the inner hole and the outer circle of the end ring is k9 in the d-axis direction and k10 in the q-axis direction, then 1.1≤k9 / k10≤2.8.

[0049] In some implementations, 1.2 ≤ k9 / k10 ≤ 1.8.

[0050] In some embodiments, a counterweight is mounted on the end ring, with the counterweight positioned on the side with the larger radial width between the inner hole and the outer circle of the end ring.

[0051] In some embodiments, at least part of the filling groove is filled with a conductive but non-magnetic material, and a short circuit is achieved through the end rings at both ends of the second rotor lamination to form a squirrel cage.

[0052] In some implementations, the d-axis and q-axis divide the first rotor lamination into four quadrants from the center of its shaft hole. In the first quadrant, the minimum distance from the geometric center of the dividing rib to the d-axis is kd1, and the minimum distance to the q-axis is kq1, where kq1 = -ν*kd1 + λ, and 0.28 ≤ ν ≤ 0.46, 28 ≤ λ ≤ 33.

[0053] The present invention also provides a self-starting synchronous reluctance motor, including the motor rotor described above.

[0054] The present invention also provides a compressor, including the above-described self-starting synchronous reluctance motor.

[0055] The present invention provides a motor rotor and its self-starting synchronous reluctance motor and compressor, which limits the minimum distance between the rotor filling slots. On the one hand, it can reduce the saturation of the magnetic channel between the filling slots, and on the other hand, it can stagger the relative position of the magnetic channel and the stator teeth. This helps to reduce motor harmonics, reduce torque pulsation, reduce harmonic losses, and improve motor efficiency and operational stability. Attached Figure Description

[0056] Figure 1 This is a schematic diagram (axial direction) of the first rotor lamination of the motor rotor according to an embodiment of the present invention;

[0057] Figure 2 This is a schematic diagram (axial direction) of the second rotor lamination of the motor rotor according to an embodiment of the present invention;

[0058] Figure 3 This is a schematic diagram (axial direction) of the electronic rotor according to an embodiment of the present invention;

[0059] Figure 4 This is a schematic diagram (axial direction) of the first rotor lamination of a motor rotor according to another embodiment of the present invention;

[0060] Figure 5 This is a schematic diagram (axial direction) of the first rotor lamination of a motor rotor according to another embodiment of the present invention;

[0061] Figure 6 A comparison of the current waveforms of a motor employing the technical solution of this invention with those of motors in the prior art is provided.

[0062] Figure 7 A comparison of torque pulsation between the motor employing the technical solution of the present invention and motors in the prior art;

[0063] Figure 8 A comparison of harmonic losses between a motor employing the technical solution of this invention and a motor in the prior art;

[0064] Figure 9 This invention provides a comparison of the efficiency of a motor employing the technical solution of this invention with that of a motor in the prior art.

[0065] Figure 10 This is a three-dimensional structural diagram of the motor rotor according to an embodiment of the present invention.

[0066] The reference numerals in the attached figures are as follows:

[0067] 1. First rotor lamination; 2. Slit groove; 31. First filling groove; 32. Second filling groove; 4. Shaft hole; 5. Dividing rib; 10. Second rotor lamination; 11. Connecting groove; 12. End ring. Detailed Implementation

[0068] See also Figures 1 to 10 As shown, according to an embodiment of the present invention, a motor rotor is provided, including a rotor core. The rotor core includes a first rotor lamination 1. The first rotor lamination 1 has a filling groove and a slit groove 2. The filling groove includes a second filling groove 32 and a first filling groove 31. The first rotor lamination 1 is provided with multiple layers of magnetic barrier layers spaced along its q-axis. The multiple layers of magnetic barrier layers include two outer magnetic barrier layers and multiple inner magnetic barrier layers located between the two outer magnetic barrier layers. The outer magnetic barrier layers include the first filling groove 31, and the inner magnetic barrier layers include the slit groove 2 and two filling grooves located between the two outer magnetic barrier layers. The second filling groove 32 at the end, within the same inner magnetic barrier layer, has a dividing rib 5 between the second filling groove 32 and the slit groove 2. The plane containing the axial side edge of the dividing rib 5 near the outer circle of the rotor has a center point. The distance between the two center points corresponding to the two dividing ribs 5 in any two adjacent magnetic barrier layers along the d-axis is L. The maximum distance along the q-axis of the magnetic conductive channel formed between the filling grooves in the two adjacent magnetic barrier layers is W. Therefore, L should satisfy 0 ≤ L < 2W, more preferably 0 ≤ L < W, and optimally 0 ≤ L ≤ 0.8W. In this technical solution, limiting the minimum distance between the rotor filling grooves can, on the one hand, reduce the saturation of the magnetic conductive channel between the filling grooves, and on the other hand, stagger the relative positions of the magnetic conductive channel and the stator teeth. This helps to reduce motor harmonics, reduce torque pulsation, reduce harmonic losses, and improve motor efficiency and operational stability. Figures 6-9 The diagram shows a comparison of the effects of the present invention and existing technologies. Figure 6 It can be seen that, compared with existing technologies, the current waveform of this invention is closer to a sine wave; from Figure 7 It can be concluded that the motor torque ripple is significantly reduced by adopting the technical solution of this invention; Figure 8 It can be seen that the current harmonic content is significantly reduced under the technology of this invention; Figure 9 It can be seen that, under the technology of this invention, the motor efficiency is improved at different torque points.

[0069] It should be noted that the aforementioned center point is the geometric center point of the plane along the axial direction of the side edge of the dividing rib 5 closest to the outer circle of the rotor. As a specific implementation method, such as... Figure 1 As shown, the aforementioned plane is a rectangular plane extending along the axial direction of the first rotor lamination 1. The geometric center point of this rectangular plane, which is also the intersection of its diagonals, is the midpoint of the side length of the dividing rib 5 on the side closest to the outer circle of the rotor after being projected onto the axial direction of the first rotor lamination 1.

[0070] In some embodiments, after the rotor core is assembled with the corresponding stator core, the width of the air gap formed between the rotor core and the stator core is σ, where 0 ≤ L < 8σ, and more preferably, 0 ≤ L ≤ 6σ. The dividing ribs 5 can enhance the mechanical strength of the rotor, reduce the deformation of the rotor during manufacturing, reduce the difficulty of the process, limit the relative distance between the dividing ribs between each filling slot and slit slot of the rotor, increase the area of ​​pressure-bearing between two adjacent magnetic barrier layers, form a mutual support effect, reduce the deformation of the rotor during manufacturing, and reduce the difficulty of the process.

[0071] In some embodiments, the width of the dividing rib 5 in the inner magnetic barrier layer adjacent to the first filling groove 31 in the d-axis direction is L1, the first rotor lamination has a shaft hole 4, and the width of the dividing rib 5 in the inner magnetic barrier layer adjacent to the shaft hole 4 in the d-axis direction is L2. L1 is not less than L2 and L1≥0.5*σ, which limits the minimum width of the dividing rib 5, which can reduce the processing difficulty and improve the mechanical strength of the rotor; L1≥L2 can reduce the leakage magnetic flux of the inner magnetic barrier layer and improve the motor efficiency.

[0072] In some embodiments, the dividing rib 5 corresponds to the side of the adjacent second filling groove 32 and / or slit groove 2 that is parallel to or intersects the q axis. That is, the shape of the dividing rib 5 is not limited to a rectangle, trapezoid, or arc. The shape of the dividing rib can be flexibly designed according to the direction of the leakage magnetic field lines to reduce motor leakage magnetic field.

[0073] In some embodiments, the plane containing the side edge of the dividing rib 5 near the outer circle of the rotor has a center point. The distance between the two center points corresponding to the dividing rib 5 of the outermost magnetic barrier layer near the outer circle of the rotor and the dividing rib 5 of the adjacent magnetic barrier layer along the d-axis is k7; the distance between the two center points corresponding to the dividing rib 5 of the outermost magnetic barrier layer near the outer circle of the rotor and the dividing rib 5 of the innermost magnetic barrier layer near the rotor shaft hole along the d-axis is k8. Then 0≤k7 / k8≤0.6, more preferably, 0≤k7 / k8≤0.4, and most preferably, 0≤k7 / k8≤0.2. With this setting, the filling groove in the outer layer can provide support for the slit groove 2 in the inner layer, reducing the deformation of the rotor during the manufacturing process.

[0074] The d-axis and q-axis divide the first rotor lamination 1 into four quadrants from the center of its shaft hole 4. In the first quadrant (for example...), Figure 1 The first rotor lamination in the upper left corner region), the minimum distance from the geometric center of the dividing rib 5 to the d-axis is kd1, and the minimum distance to the q-axis is kq1, kq1=-ν*kd1+λ, where 0.28≤ν≤0.46 (dimensionless), 28≤λ≤33 (dimensions consistent with kq1 and kd1), in order to limit the position and width of the dividing rib, further reducing the risk of rotor deformation.

[0075] In some embodiments, the filling groove is located on the outer periphery of the rotor. The distance between the filling groove of the innermost magnetic barrier layer near the shaft hole and the outer circle of the rotor is L3, and the distance between the filling groove of the outermost magnetic barrier layer near the outer circle of the rotor and the outer circle of the rotor is L4. L4≥L3 and 0≤L3≤2.5σ, that is, the filling groove is an open groove or a closed groove. When the filling groove is a closed groove, limiting the maximum distance between it and the outer circle of the rotor can reduce magnetic leakage. L4≥L3 can reduce the magnetic leakage of the inner magnetic barrier layer while ensuring the mechanical strength at the outer magnetic barrier layer.

[0076] In some embodiments, the maximum width of the filling groove along the q-axis at the end near the outer circle of the rotor is not greater than the maximum width along the q-axis of the region of the filling groove near the rotor q-axis. More preferably, the width of the filling groove along the q-axis is approximately equal from the outer circle of the rotor to the rotor q-axis, with a width deviation of no more than 5%. Ensuring the width of the magnetic channel near the air gap between the rotor magnetic barrier layers reduces rotor saturation. Setting the width of the filling groove along the q-axis to be approximately equal (i.e., no more than 5%) can increase the area of ​​the filling groove while ensuring the width of the magnetic channel near the air gap, which helps improve start-up.

[0077] The ratio of the maximum width to the minimum width of the filling groove in the q-axis direction is τ, where 1 ≤ τ ≤ 2, and more preferably, 1.3 ≤ τ ≤ 1.5. Limiting this ratio ensures that, on the one hand, the width of the magnetic channel is not too small due to excessive thickness of the filling groove in the q-axis direction, thus affecting efficiency; on the other hand, the area of ​​the filling groove is not too small due to excessive thickness in the q-axis direction, thus affecting startup.

[0078] In some embodiments, the maximum width of the second filling groove 32 in each inner magnetic barrier layer gradually increases along the d-axis direction towards the d-axis. More preferably, the maximum width of each second filling groove 32 increases continuously along the d-axis direction for at least three layers towards the d-axis. Most preferably, the maximum width of each second filling groove 32 continuously decreases along the d-axis direction from the second inner magnetic barrier layer near the d-axis to the magnetic barrier layer near the outer circumference of the rotor towards the direction away from the d-axis. This arrangement ensures an appropriate amount of cast aluminum while making reasonable use of the rotor space, thereby improving the motor's starting capability.

[0079] In some embodiments, the slit slot 2 is composed of arc segments and / or straight segments. From the shaft hole side to the outer circle side of the rotor, the curvature of the arc segments of the slit slot 2 gradually increases, and the curvature of the outer circle of the slit slot in the same layer is greater than that of the inner circle. The arc segments protrude away from the shaft hole side. Alternatively, the two ends of the slit slot 2 extend into straight segments along the d-axis direction, and some or all of the two ends of the slit slot 2 are parallel to the d-axis. The width of the slit slot 2 gradually increases from the middle position (q-axis) to both ends (d-axis). The rotor has a shaft hole 4 in the middle. This arrangement can increase the utilization rate of rotor space, rationally arrange the slit slots, increase the rotor salient pole ratio, and improve the motor reluctance torque.

[0080] Moving away from the d-axis, the width of the slit slot 2 decreases continuously in at least three layers along the q-axis; the width of the slit slot 2 on the q-axis is m2, the width of the first filling groove 31 on the q-axis is m1, and the sum of the widths of all slit slots 2 and the first filling groove 31 on the q-axis is (m1 + ∑m2). The width from the wall of the shaft hole 4 to the outer circle of the first rotor lamination is m3, and (m1 + ∑m2) / m3 = 0.2 to 0.5, preferably (m1 + ∑m2) / m3 = 0.3 to 0.4. A reasonable magnetic barrier ratio is selected to ensure both sufficient magnetic barrier width and a reasonable magnetic flux path, increasing the motor's salient pole ratio while preventing magnetic circuit oversaturation.

[0081] In some embodiments, from the shaft hole side to the outer circle side of the rotor, the curve length between the ends of each layer of slit groove 2 near the two second filling grooves 32 gradually decreases, and the curve length of adjacent slit grooves 2 decreases by 5% to 25%. The purpose of this setting is to ensure a certain proportion of magnetic barrier layer while making reasonable use of rotor space, thereby improving motor performance.

[0082] In some embodiments, the dividing rib 5 has a minimum width L2 in the d-axis direction, where L2 ≥ 0.5 * σ, and σ is the width of the air gap formed between the rotor core and the stator core, which can ensure the mechanical strength of the rotor part structure.

[0083] In some embodiments, the first rotor lamination 1 has at least five different filling areas in the filling grooves (i.e., the first filling groove 31 and the second filling groove 32); and / or, the total filling area of ​​the first filling groove 31 and the second filling groove 32 accounts for 30% to 70% of the total area of ​​the first filling groove 31, the second filling groove 32 and the slit groove 2, preferably 35% to 50%, to ensure a certain proportion of filling groove area so that the motor has a certain load-bearing starting capability.

[0084] The minimum width of the magnetic channel between two adjacent filling slots in two adjacent magnetic barrier layers is W1, where W1 ≥ d, and d is the minimum width of the magnetic channel between the slit slots in the two adjacent magnetic barrier layers. More preferably, W1 / d > 1.15. The purpose is to ensure that there is sufficient width between the filling slots to avoid magnetic field saturation, which would affect the magnetic flux flow between the magnetic barrier layers.

[0085] The minimum distance along the q-axis between two adjacent slots 2 in two adjacent magnetic barrier layers is h1, where h1 ≥ 1.5h2, and h2 is the minimum width along the q-axis of the smaller magnetic barrier layer among the two adjacent magnetic barrier layers. This design reduces the difficulty of rotor manufacturing and ensures the uniformity and unsaturation of the rotor's magnetic flux density distribution.

[0086] In some embodiments, the width of the first filling groove 31 along the d-axis is smaller than the width along the d-axis between the ends of the two second filling grooves 32 in the adjacent magnetic barrier layer near the slit groove 2. The purpose of this arrangement is to limit the width of the first filling groove 31 along the d-axis to avoid deformation of the rotor toward the shaft hole side or the outer circle side due to excessive width.

[0087] In some embodiments, the ratio of the distance L5 from the inner wall of the first filling groove 31 to the rotor center in the q-axis direction to the rotor radius Rr satisfies 0.82≤L5 / Rr≤0.96. If L5 / Rr is too small, the outermost magnetic channel is too narrow, motor losses increase, and efficiency decreases; if L5 / Rr is too large, the distance between the first filling groove 31 and the outer circle of the rotor is too small, increasing the processing difficulty. The ratio of the distance between the sides of the two innermost magnetic barrier layers near the shaft hole on the q-axis and the width of the shaft on the q-axis is greater than 1.2. On the one hand, this can ensure the width of the magnetic channel between the innermost magnetic barrier layer and the shaft, reducing the rotor magnetic flux saturation; on the other hand, it can enhance the mechanical strength of the rotor near the shaft. And / or, the ratio of the diameter of the arc segment of the side of the innermost magnetic barrier layer near the shaft hole to the width of the shaft on the q-axis is greater than 2, so as to make reasonable use of the rotor space for the arrangement of the magnetic barrier layers.

[0088] In some embodiments, the maximum thickness of the first filling groove 31 along the q-axis is k, the maximum thickness of the second filling groove 32 in the adjacent magnetic barrier layer along the q-axis is k1, and the minimum thickness of the magnetic conductive channel connected to it along the q-axis is k2. Then 1 < k / k1 ≤ 2, and / or 0.8 < k / k2 ≤ 1.6, which ensures both the thickness of the first filling groove 31 along the q-axis to reduce processing difficulty and the width of the outermost magnetic conductive channel to improve motor performance.

[0089] A magnetic channel is formed between two adjacent magnetic barrier layers. The width of each magnetic channel on the q-axis gradually decreases in the direction away from the d-axis. More preferably, the width of each magnetic channel on the q-axis decreases continuously for at least three layers in the direction away from the d-axis. The magnetic channel closer to the shaft hole 4 has a greater interaction with the stator and a greater impact on motor performance. This design, while making reasonable use of rotor space, ensures the width of the magnetic channel near the shaft hole, which helps improve motor performance.

[0090] A magnetic channel is formed between two adjacent magnetic barrier layers. For a magnetic channel composed of arc segments and straight segments, the width of the magnetic channel (defined as the shortest distance from each point on one side of the magnetic channel to the other side) gradually increases from the q-axis to both sides of the q-axis. The width of the magnetic channel defined here is the cross-sectional width through which the magnetic lines of force pass on the rotor. This design helps to reduce the rotor's magnetic flux density saturation and reduce motor losses.

[0091] In some implementations, the ratio of the width of the slit groove 2 on the q-axis to the width of the slit groove 2 near the end of the filling groove in each magnetic barrier layer is τ1. τ1 gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer, which ensures both the width of the magnetic conduction channel between the inner magnetic barrier layers and a certain proportion of the magnetic barrier layer, thereby improving motor performance.

[0092] In some embodiments, the ratio of the maximum width of the filling groove along the q-axis to the width of the slit groove 2 along the q-axis in each magnetic barrier layer is τ2, where τ2 > 1.4, and preferably, 1.5 < τ2 < 3.0. Limiting this ratio ensures that the filling groove has a certain width to increase its arrangement area; limiting the range of this ratio can also ensure the width of the magnetic conductive channel between the filling grooves.

[0093] In the outer magnetic barrier layer near the outer circumference of the rotor, the width along the d-axis between the ends of the two second filling grooves 32 located at both ends of the slit groove 2 is k3; in the inner magnetic barrier layer adjacent to it near the shaft hole, the width along the d-axis between the ends of the two second filling grooves 32 located at both ends of the slit groove 2 is k4, 0.5≤k3 / k4≤1 or 0.5≤k4 / k3≤1. Given the limited rotor space, this arrangement increases the area of ​​the filling grooves and improves the motor's starting capability. The width along the d-axis between the ends of the two second filling grooves 31 located at both ends of the outermost slit groove 2 near the outer circumference of the rotor is k5; the width along the d-axis between the ends of the two second filling grooves 32 located at both ends of the innermost slit groove 2 near the rotor shaft hole is k6, then 0.5≤k5 / k6≤1 or 0.5≤k6 / k5≤1. Given the limited rotor space, this design can increase the area of ​​the filling slots and improve the motor's starting capability.

[0094] In some embodiments, the angle between the two ends of the first filling groove 31 and the line connecting the rotor center is α1, 20°≤α1≤60°, preferably 30°≤α1≤50°, and more preferably 30°≤α1≤35°. This setting forms a magnetic barrier layer and serves as a filling groove, which can both increase the magnetic reluctance torque of the motor and act as a starting squirrel cage to improve the starting performance of the motor.

[0095] The number of first filling slots 31 is n, n≥1. There is no restriction on whether the first filling slots 31 are arranged as a whole or in blocks, or on the number of blocks. They can be flexibly selected according to the rotor strength requirements and the rotor leakage flux. If a small rotor leakage flux is required, the value of n is small; if a large rotor strength is required, the value of n is large. And / or, the deviation of the parallel angle between the length extension direction of the filling slot and the d-axis does not exceed 5%, so as to ensure smooth flow of the rotor d-axis magnetic lines of force and minimize the q-axis magnetic lines of force, increase the motor saliency difference, and improve the motor output and efficiency.

[0096] In some embodiments, the maximum width of the shaft hole 4 on the first rotor lamination in the q-axis direction is not greater than its maximum width in the d-axis direction, and a slit slot 2 is provided in the q-axis direction. This arrangement can increase the utilization rate of the rotor space, so as to reasonably arrange the slit slot 2, increase the rotor salient pole ratio, and improve the motor reluctance torque.

[0097] The shaft hole 4 is composed of arc segments and / or straight segments. The shape of the shaft hole is not limited to a circle, ellipse, quasi-ellipse, or quadrilateral. The shape of the shaft hole can be flexibly set to match the arrangement of the slit groove.

[0098] In some embodiments, the rotor core further includes a second rotor lamination 10, which is disposed between the end ring 12 and the first rotor lamination 1. The second rotor lamination 10 has a connecting groove 11 corresponding to the filling groove (which has the same function as the filling groove).

[0099] In some embodiments, the maximum width of the outer contour of the second rotor lamination 10 is not greater than the outer diameter of the first rotor lamination 1, and the maximum width of the inner hole of the second rotor lamination 10 on the q-axis is not less than the maximum width on the d-axis. Preferably, the ratio of the maximum width of the inner hole of the second rotor lamination 10 on the q-axis to the maximum width on the d-axis is 1 to 1.5. As part of the rotor, the outer contour of the second rotor lamination 10 must not be greater than the outer diameter of the first rotor lamination 1 to form an air gap with a certain width between it and the stator. The slit groove of its inner contour on the q-axis direction corresponds to the slit groove of the first rotor lamination, and its q-axis width must not be less than the d-axis width so that a sufficient area of ​​slit groove can directly contact the air, forming a flow hole and increasing rotor heat dissipation.

[0100] The axial thickness of the second rotor lamination 10 is not less than the thickness of a single first rotor lamination 1, so as to ensure the mechanical strength of the rotor.

[0101] In some embodiments, the radial width between the inner hole and the outer circle of the second rotor lamination 10 is minimized on the q-axis, and the radial width kd2 of the second rotor lamination 10 on the d-axis and its radial width kq2 on the q-axis satisfy 1.1≤kd2 / kq2≤2.8, preferably 1.2≤kd2 / kq2≤1.8, to ensure that a sufficient number of slits 2 on the first rotor lamination 1 are located within the inner hole of the second rotor lamination 10.

[0102] In some embodiments, the total area of ​​the connecting grooves 11 on the second rotor lamination 10 is less than or equal to the total area of ​​the filling grooves on the first rotor lamination 1. The connecting grooves 11 on the second rotor lamination 10 are the inlets for filling material into the filling grooves on the first rotor lamination 1. The connecting grooves on the second rotor lamination 10 allow the filling material to enter the filling grooves on the first rotor lamination 1. Ensuring that the total area of ​​the connecting grooves 11 on the second rotor lamination 10 is not greater than the total area of ​​the filling grooves on the first rotor lamination 1 reduces the stress area of ​​the non-filling groove portion of the first rotor lamination during material filling, ensuring its mechanical strength during the material filling process and reducing deformation.

[0103] The connecting groove 11 provided on the second rotor lamination 10 is in the same position as the filling groove provided on the first rotor lamination 1. The area of ​​a single connecting groove 11 on the second rotor lamination 10 is not greater than the area of ​​a single filling groove on the first rotor lamination 1 at the same position, so as to reduce the local deformation of the first rotor lamination when filling material.

[0104] In some embodiments, the width of the inner hole of the second rotor lamination 10 and the connecting groove 11 along the d-axis is greater than the width of the dividing rib 5 between the connecting groove 11 and the corresponding slit groove 2 along the d-axis, so as to ensure that the slit groove 2 is not filled during the manufacturing process of the rotor.

[0105] In some embodiments, the total area of ​​the slits 2 on the first rotor lamination 1 located on the inner circumferential side of the inner hole of the second rotor lamination 10 accounts for at least 20% of the total area of ​​the motor flow holes, preferably 25% to 40%; and / or, the total area of ​​the slits 2 on the first rotor lamination 1 located within the inner hole of the second rotor lamination 10 accounts for at least 30% of the total area of ​​the slits 2, preferably 45% to 65%, to ensure that a sufficient area of ​​slits is in direct contact with air, forming flow holes and increasing rotor heat dissipation. It should be noted that the total area of ​​the motor flow holes includes the total area of ​​the flow holes of the motor stator core and the total area of ​​the slits 2 not blocked by the second rotor lamination 10 (that is, the total area of ​​the slits 2 within the inner hole of the second rotor lamination 10).

[0106] In some embodiments, from the rotor shaft hole side to the rotor outer circle side, the area of ​​the slit groove 2 in each magnetic barrier layer on the first rotor lamination 1 located on the inner circumferential side of the inner hole of the second rotor lamination 10 gradually decreases. At this time, the corresponding end ring 12 has a certain thickness along the q-axis at the magnetic barrier layer near the rotor outer circle side, which can ensure that the end ring 12 has a certain volume to improve the motor starting capability.

[0107] In some embodiments, the maximum width of the outer contour of the end ring 12 is not greater than the maximum width of the outer contour of the second rotor lamination 10, and the maximum distance from the center of the rotor core to the end face of the end ring 12 is not less than the maximum distance from the center of the rotor core to the end face of the second rotor lamination 10. The maximum width of the outer contour of the end ring 12 is not greater than the maximum width of the outer contour of the second rotor lamination 10, so as to ensure that the portion of the first rotor lamination located on the outer circle side of the rotor that is not covered by the second rotor lamination 10 is subjected to force when filling material, thereby reducing local deformation. The maximum distance from the center of the rotor core to the end face of the end ring 12 is not less than the maximum distance from the center of the rotor core to the end face of the second rotor lamination 10, ensuring that the rotor has an end ring of a certain volume, which helps to improve the motor starting capability.

[0108] The radial width between the inner hole and the outer circle of the end ring 12 is k9 in the d-axis direction and k10 in the q-axis direction. Therefore, 1.1 ≤ k9 / k10 ≤ 2.8, preferably 1.2 ≤ k9 / k10 ≤ 1.8. The inner filling groove near the shaft hole has a larger width along the d-axis direction. To allow the filling groove to self-short-circuit, the radial width of the end ring in the d-axis direction is larger. To ensure the area of ​​the slit groove directly in contact with air, the radial width of the end ring in the d-axis direction cannot be too large. A balance block is installed on the end ring 12, positioned on the side with the larger radial width between the inner hole and the outer circle of the end ring 12.

[0109] At least part of the filling slot is filled with a conductive but non-magnetic material, and short-circuited through the end rings 12 at both ends of the second rotor lamination 1 to form a squirrel cage. The material of the end rings 12 is the same as the filling material in the filling slot. The self-short-circuited squirrel cage structure provides asynchronous torque during the motor starting phase to achieve self-starting of the motor, eliminating controller losses and improving motor efficiency. The multi-layer magnetic barrier structure provides reluctance torque to the motor to achieve synchronous operation.

[0110] It should be noted that the distances between the side of the dividing rib 5 near the outer circle of the rotor and the q-axis in two adjacent magnetic barrier layers are not equal. Specifically, the distance between the side of the dividing rib 5 in the outer magnetic barrier layer (near the outer circle of the rotor) and the q-axis is greater or less than the distance between the side of the dividing rib 5 in the inner magnetic barrier layer (near the rotor shaft hole) and the q-axis. Figure 4 In this context, h3 ≠ h4, specifically h3 > h4, while... Figure 1In the case of h3 < h4.

[0111] The plane containing the side of the dividing rib 5 is parallel to or intersects the plane containing the q-axis. That is, the shape of the dividing rib is not limited to rectangle, trapezoid, or arc. Specifically, for example... Figure 5 This shows the case where the plane containing the side of part of the dividing rib 5 intersects the plane containing the q-axis, while Figure 1 The middle section shows the parallel case.

[0112] The motor rotor structure provided by this invention, by limiting the minimum distance between the rotor filling slots, can reduce the saturation of the magnetic channels between the filling slots and stagger the relative positions of the magnetic channels and stator teeth. This helps to reduce motor harmonics, reduce torque pulsation, reduce harmonic losses, and improve motor efficiency and operational stability. At the same time, by limiting the relative distance between the dividing ribs between each filling slot and the slit slot, the rotor can increase the pressure-bearing area between two adjacent magnetic barrier layers, forming a mutual support effect. This reduces rotor deformation during manufacturing and lowers the process difficulty.

[0113] It is understood that the length, width, thickness, diameter, etc. of the rotor core related structures in this invention can preferably be measured in mm, and other suitable units of measurement can also be selected under reasonable circumstances.

[0114] This invention provides a self-starting synchronous reluctance motor rotor. The motor achieves self-starting through the asynchronous torque provided by the rotor guide bars (i.e., the components formed after the filler slots are filled), solving the problem of synchronous reluctance motors requiring frequency converter drive. Simultaneously, it reduces motor losses and improves motor efficiency. This motor rotor can reduce motor harmonics, reduce torque ripple, decrease harmonic losses, and improve motor efficiency and operational stability. It can also enhance the rotor's mechanical strength, reduce rotor deformation during manufacturing, and lower the manufacturing difficulty.

[0115] According to an embodiment of the present invention, a self-starting synchronous reluctance motor is also provided, particularly a self-starting synchronous reluctance two-pole motor, including the above-described motor rotor, wherein the load inertia connected to the output end of the motor shaft is less than 60% of the inertia of the motor shaft system itself.

[0116] According to an embodiment of the present invention, a compressor is also provided, including the self-starting synchronous reluctance motor described above.

[0117] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0118] 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. A motor rotor, characterized in that, The rotor core includes a first rotor lamination (1). The first rotor lamination (1) has a filling groove and a slit groove (2). The filling groove includes a second filling groove (32) and a first filling groove (31). The first rotor lamination (1) has multiple magnetic barrier layers spaced along its q-axis. The multiple magnetic barrier layers include two outer magnetic barrier layers and multiple inner magnetic barrier layers located between the two outer magnetic barrier layers. The outer magnetic barrier layer includes a first filling groove (31). The inner magnetic barrier layer includes a slit groove (2) and a second filling groove (32) located at both ends of the slit groove (2). Within the same inner magnetic barrier layer, there is a dividing rib (5) between the second filling groove (32) and the slit groove (2). The plane of the axial direction of the side edge of the dividing rib (5) near the outer circle of the rotor has a center point. The distance between the two center points corresponding to the two dividing ribs (5) in any two adjacent magnetic barrier layers along the d-axis is L. The maximum distance of the magnetic conductive channel formed between the filling grooves in the two adjacent magnetic barrier layers along the q-axis is W. 0≤L<2W, when the rotor core is assembled with the corresponding stator core, the width of the air gap formed between the rotor core and the stator core is σ, 0≤L<8σ.

2. The motor rotor according to claim 1, characterized in that, 0 ≤ L < W.

3. The motor rotor according to claim 2, characterized in that, 0≤L≤0.8W.

4. The motor rotor according to claim 1, characterized in that, 0≤L≤6σ.

5. The motor rotor according to claim 1, characterized in that, The width of the dividing rib (5) in the inner magnetic barrier layer adjacent to the first filling groove (31) in the d-axis direction is L1. The first rotor lamination (1) has a shaft hole (4). The width of the dividing rib (5) in the inner magnetic barrier layer adjacent to the shaft hole (4) in the d-axis direction is L2. L1 is not less than L2 and L1≥0.5*σ.

6. The motor rotor according to claim 1, characterized in that, There is a center point on the plane of the side of the dividing rib (5) near the outer circle of the rotor. The distance between the two center points of the dividing rib (5) of the outermost magnetic barrier layer near the outer circle of the rotor and the dividing rib (5) of the adjacent magnetic barrier layer along the d-axis is k7; the distance between the two center points of the dividing rib (5) of the outermost magnetic barrier layer near the outer circle of the rotor and the dividing rib (5) of the innermost magnetic barrier layer near the rotor shaft hole along the d-axis is k8. Then 0≤k7 / k8≤0.

6.

7. The motor rotor according to claim 1, characterized in that, The filling groove is located on the outer periphery of the rotor. The spacing between the filling groove of the innermost magnetic barrier layer near the shaft hole and the outer circle of the rotor is L3, and the spacing between the filling groove of the outermost magnetic barrier layer near the outer circle of the rotor and the outer circle of the rotor is L4, where L4≥L3 and 0≤L3≤2.5σ; and / or, the maximum width of the end of the filling groove near the outer circle of the rotor along the q-axis is not greater than the maximum width of the area of ​​the filling groove near the q-axis of the rotor along the q-axis.

8. The motor rotor according to claim 7, characterized in that, From the outer circle of the rotor to the q-axis of the rotor, the width deviation of the filling groove along the q-axis direction is no greater than 5%; and / or, the ratio between the maximum width and the minimum width of the filling groove in the q-axis direction is τ, 1≤τ≤2.

9. The motor rotor according to claim 1, characterized in that, The maximum width of the second filling groove (32) in each inner magnetic barrier layer gradually increases along the d-axis direction towards the d-axis.

10. The motor rotor according to claim 9, characterized in that, In the direction closer to the d-axis, the maximum width of each second filling groove (32) along the d-axis direction increases continuously for at least three layers; and / or, in the direction away from the d-axis, from the inner magnetic barrier layer of the second layer closer to the d-axis to the magnetic barrier layer closer to the outer circle of the rotor, the maximum width of each second filling groove (32) along the d-axis direction decreases continuously.

11. The motor rotor according to claim 1, characterized in that, The slit groove (2) is composed of arc segments and / or straight segments. From the shaft hole side to the outer circle side of the rotor, the arc of the arc segment of the slit groove (2) gradually increases, and the arc of the outer circle of the slit groove in the same layer is greater than the arc of the inner circle. The arc segment protrudes away from the shaft hole side; or, the two ends of the slit groove (2) extend into straight segments along the d-axis direction. The two ends of part or all of the slit groove (2) are parallel to the d-axis. The width of the slit groove (2) gradually increases from the middle position of the slit groove (2) to both ends.

12. The motor rotor according to claim 11, characterized in that, Moving away from the d-axis, the width of the slit groove (2) in the q-axis direction decreases continuously by at least 3 layers; the width of the slit groove (2) in the q-axis is m2, the width of the first filling groove (31) in the q-axis is m1, the sum of the widths of all the slit grooves (2) and the first filling groove (31) in the q-axis is (m1+∑m2), the width from the hole wall of the shaft hole (4) to the outer circle of the first rotor lamination is m3, and (m1+∑m2) / m3=0.2~0.

5.

13. The motor rotor according to claim 1, characterized in that, From the shaft hole side to the outer circle side of the rotor, the curve length between the ends of each layer of slit groove (2) near the two second filling grooves (32) gradually decreases, and the curve length of adjacent slit grooves (2) decreases by 5%~25%; and / or, the dividing rib (5) has a minimum width L2 in the d-axis direction, L2≥0.5*σ, where σ is the width of the air gap formed between the rotor core and the stator core.

14. The motor rotor according to claim 1, characterized in that, The first rotor lamination (1) has at least five different filling grooves with different filling areas; and / or, the total filling area of ​​the first filling groove (31) and the second filling groove (32) accounts for 30% to 70% of the total area of ​​the first filling groove (31), the second filling groove (32) and the slit groove (2).

15. The motor rotor according to claim 1, characterized in that, The minimum width of the magnetic channel between two adjacent filling slots in two adjacent magnetic barrier layers is W1, where W1 ≥ d, and d is the minimum width of the magnetic channel between the slit slots in the two adjacent magnetic barrier layers.

16. The motor rotor according to claim 15, characterized in that, W1 / d > 1.

15.

17. The motor rotor according to claim 1, characterized in that, The minimum distance along the q-axis between two adjacent slit slots (2) in two adjacent magnetic barrier layers is h1, h1≥1.5h2, where h2 is the minimum width along the q-axis of the slit slot (2) in the two adjacent magnetic barrier layers that is smaller than the minimum width along the q-axis of the magnetic barrier layer; and / or, the width along the d-axis of the first filling slot (31) is less than the width along the d-axis between the ends of the two second filling slots (32) in the adjacent magnetic barrier layer that are closer to the slit slot (2).

18. The motor rotor according to claim 1, characterized in that, The ratio of the distance L5 from the inner wall of the first filling groove (31) to the rotor center in the q-axis direction to the rotor radius Rr satisfies 0.82≤L5 / Rr≤0.96; and / or, the ratio of the distance on the q-axis between the side of the innermost magnetic barrier layer near the shaft hole and the width of the shaft on the q-axis is greater than 1.2; and / or, the ratio of the diameter of the arc segment of the side of the innermost magnetic barrier layer near the shaft hole and the width of the shaft on the q-axis is greater than 2.

19. The motor rotor according to claim 1, characterized in that, The maximum thickness of the first filling groove (31) along the q-axis is k, the maximum thickness of the second filling groove (32) in the adjacent magnetic barrier layer along the q-axis is k1, and the minimum thickness of the magnetic channel connected to it along the q-axis is k2. Then 1 < k / k1 ≤ 2, and / or 0.8 < k / k2 ≤ 1.

6.

20. The motor rotor according to claim 1, characterized in that, A magnetic channel is formed between two adjacent magnetic barrier layers. The width of each magnetic channel on the q axis gradually decreases in the direction away from the d-axis.

21. The motor rotor according to claim 20, characterized in that, In the direction away from the d-axis, the width of each magnetic channel on the q-axis decreases continuously for at least three layers; and / or, a magnetic channel is formed between two adjacent magnetic barrier layers. For a magnetic channel composed of arc segments and straight segments, the width of the magnetic channel gradually increases from the q-axis to both sides of the q-axis.

22. The motor rotor according to claim 1, characterized in that, In each magnetic barrier layer, the ratio of the width of the slit groove (2) on the q axis to the width of the slit groove (2) near the end of the filling groove is τ1. τ1 gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer.

23. The motor rotor according to claim 1, characterized in that, In each magnetic barrier layer, the ratio of the maximum width of the filling groove along the q-axis to the width of the slit groove (2) along the q-axis is τ2, where τ2 > 1.

4.

24. The motor rotor according to claim 1, characterized in that, In the outer magnetic barrier layer near the outer circle of the rotor, the width along the d-axis between the ends of the two second filling grooves (32) located at both ends of the slit groove (2) on the side near the slit groove (2) is k3; in the inner magnetic barrier layer adjacent to it near the shaft hole, the width along the d-axis between the ends of the two second filling grooves (32) located at both ends of the slit groove (2) on the side near the slit groove (2) is k4, 0.5≤k3 / k4≤1 or 0.5≤k4 / k3≤1.

25. The motor rotor according to claim 1, characterized in that, The width along the d-axis between the ends of the two second filling grooves (31) near the outermost slit groove (2) on the side near the outer circle of the rotor is k5; the width along the d-axis between the ends of the two second filling grooves (32) near the slit groove (2) on the side near the innermost slit groove (2) on the side near the rotor shaft hole is k6. Then 0.5≤k5 / k6≤1 or 0.5≤k6 / k5≤1.

26. The motor rotor according to claim 1, characterized in that, The angle between the two ends of the first filling groove (31) and the line connecting the rotor center is α1, 20°≤α1≤60°; and / or, the number of the first filling grooves (31) is n, n≥1; and / or, the deviation of the parallel angle between the length extension direction of the filling groove and the d-axis does not exceed 5%.

27. The motor rotor according to claim 1, characterized in that, The maximum width of the shaft hole (4) on the first rotor lamination in the q-axis direction is not greater than its maximum width in the d-axis direction; and / or, the shaft hole (4) is composed of arc segments and / or straight segments.

28. The motor rotor according to claim 1, characterized in that, The rotor core also includes a second rotor lamination (10), which is disposed between the end ring (12) and the first rotor lamination (1). A connecting groove (11) is provided on the second rotor lamination (10) corresponding to the filling groove.

29. The motor rotor according to claim 28, characterized in that, The maximum width of the outer contour of the second rotor lamination (10) is not greater than the outer diameter of the first rotor lamination (1), the maximum width of the inner hole of the second rotor lamination (10) on the q axis is not less than its maximum width on the d axis; and / or, the axial thickness of the second rotor lamination (10) is not less than the thickness of a single first rotor lamination (1).

30. The motor rotor according to claim 29, characterized in that, The ratio of the maximum width of the inner hole of the second rotor lamination (10) on the q axis to the maximum width on the d axis is 1 to 1.5; and / or, the radial width between the inner hole of the second rotor lamination (10) and its outer circle is the minimum on the q axis, and the radial width kd2 of the second rotor lamination (10) on the d axis and its radial width kq2 on the q axis satisfy 1.1≤kd2 / kq2≤2.

8.

31. The motor rotor according to claim 30, characterized in that, 1.2≤kd2 / kq2≤1.

8.

32. The motor rotor according to claim 28, characterized in that, The total area of ​​the connecting slots (11) on the second rotor lamination (10) is less than or equal to the total area of ​​the filling slots on the first rotor lamination (1).

33. The motor rotor according to claim 32, characterized in that, The connecting groove (11) provided on the second rotor lamination (10) is in the same position as the filling groove provided on the first rotor lamination (1). The area of ​​a single connecting groove (11) on the second rotor lamination (10) is not greater than the area of ​​a single filling groove on the first rotor lamination (1) at the same position.

34. The motor rotor according to claim 28, characterized in that, The width of the inner hole of the second rotor lamination (10) and the connecting groove (11) along the d-axis direction is greater than the width of the dividing rib (5) between the connecting groove (11) and the corresponding slit groove (2) along the d-axis direction.

35. The motor rotor according to claim 28, characterized in that, The total area of ​​the slit groove (2) on the first rotor lamination (1) located on the inner circumferential side of the inner hole of the second rotor lamination (10) accounts for at least 20% of the total area of ​​the motor flow hole; and / or, the total area of ​​the slit groove (2) on the first rotor lamination (1) located within the inner hole of the second rotor lamination (10) accounts for at least 30% of the total area of ​​the slit groove (2).

36. The motor rotor according to claim 35, characterized in that, The total area of ​​the slit groove (2) on the first rotor lamination (1) located on the inner circumferential side of the inner hole of the second rotor lamination (10) accounts for 25% to 40% of the total area of ​​the motor flow hole; and / or, the total area of ​​the slit groove (2) on the first rotor lamination (1) located within the inner hole of the second rotor lamination (10) accounts for 45% to 65% of the total area of ​​the slit groove (2).

37. The motor rotor according to claim 28, characterized in that, From the rotor shaft hole side to the rotor outer circle side, the area of ​​the slit groove (2) in each magnetic barrier layer on the first rotor lamination (1) located on the inner circumference side of the inner hole of the second rotor lamination (10) gradually decreases.

38. The motor rotor according to claim 28, characterized in that, The maximum width of the outer contour of the end ring (12) is not greater than the maximum width of the outer contour of the second rotor lamination (10), and the maximum distance from the center of the rotor core to the end face of the end ring (12) is not less than the maximum distance from the center of the rotor core to the end face of the second rotor lamination (10); and / or, the radial width between the inner hole and the outer circle of the end ring (12) is k9 in the d-axis direction and k10 in the q-axis direction, then 1.1≤k9 / k10≤2.

8.

39. The motor rotor according to claim 38, characterized in that, 1.2≤k9 / k10≤1.

8.

40. The motor rotor according to claim 28, characterized in that, A balance block is installed on the end ring (12), and the balance block is located on the side with the larger radial width between the inner hole and the outer circle of the end ring (12).

41. The motor rotor according to claim 1, characterized in that, At least part of the filling groove is filled with conductive but non-magnetic material, and short-circuit is achieved through the end rings (12) at both ends of the second rotor lamination (10) to form a squirrel cage; and / or, the d-axis and q-axis divide the first rotor lamination (1) into four quadrants from the center of its shaft hole (4). In the first quadrant, the minimum distance from the geometric center of the dividing rib (5) to the d-axis is kd1, and the minimum distance to the q-axis is kq1, kq1=-ν*kd1+λ, where 0.28≤ν≤0.46, 28≤λ≤33.

42. A self-starting synchronous reluctance motor, characterized in that, The motor rotor includes any one of claims 1 to 41.

43. A compressor, characterized in that, Including the self-starting synchronous reluctance motor as described in claim 42.

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