Motor rotor and self-starting synchronous reluctance motor and compressor

Abstract

This invention provides a motor rotor and its self-starting synchronous reluctance motor and compressor. The motor rotor has a first rotor lamination with a slit slot, a second filling slot, and a first filling slot. An outer magnetic barrier layer includes the first filling slot, and an inner magnetic barrier layer includes the slit slot and second filling slots at both ends of the slit slot. Within the same inner magnetic barrier layer, a dividing rib exists between the second filling slot and the slit slot. A second rotor lamination is disposed between an end ring and the first rotor lamination. A connecting slot is provided on the second rotor lamination corresponding to the filling slot. The radial width between the inner hole and the outer circle of the second rotor lamination is unequal at different positions, and the radial width of the rotor baffle on the d-axis is greater than its radial width on the q-axis. According to this invention, the radial width of the second rotor lamination on the q-axis is smaller than its radial width on the d-axis, allowing a sufficient area of ​​the slit slot to directly contact the air, forming a flow hole and increasing rotor heat dissipation.

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 heat dissipation difficulties. Summary of the Invention

[0003] Therefore, the present invention provides a motor rotor and a self-starting synchronous reluctance motor and compressor thereof, 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 difficulty in heat dissipation of the motor.

[0004] To address the aforementioned problems, this invention provides a motor rotor, comprising a rotor core, the rotor core including a first rotor lamination and a second rotor lamination. The first rotor lamination has a filling groove and a slit groove, the filling groove including a second filling groove and a first filling groove. The first rotor lamination is provided with multiple layers of magnetic barrier layers spaced along its q-axis, the multiple layers of magnetic barrier layers including 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 a first filling groove, the inner magnetic barrier layers include a slit groove and 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 second rotor lamination is disposed between the end ring and the first rotor lamination, and a connecting groove is provided on the second rotor lamination corresponding to the filling groove. The radial width between the inner hole and the outer circle of the second rotor lamination is not equal at different positions, and the radial width of the rotor baffle on the d-axis is greater than its radial width on the q-axis.

[0005] In some embodiments, the radial width kd1 of the second rotor lamination on the d-axis and its radial width kq1 on the q-axis satisfy 1.1≤kd1 / kq1≤2.8.

[0006] In some implementations, 1.2 ≤ kd1 / kq1 ≤ 1.8.

[0007] 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 holes.

[0008] 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.

[0009] 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; and / or, the axial thickness of the second rotor lamination is not less than the thickness of a single first rotor lamination.

[0010] In some embodiments, the maximum width of the inner hole of the second rotor lamination on the q-axis is not less than the maximum width on the d-axis, and 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.

[0011] In some embodiments, the total area of ​​the connecting slots on the second rotor lamination is not greater than the total area of ​​the filling slots provided on the first rotor lamination.

[0012] In some embodiments, the connecting slots on the second rotor lamination are 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.

[0013] In some embodiments, the width along the d-axis between the inner hole of the second rotor lamination and the connecting slot should be greater than the width of the dividing rib between the connecting slot and the slit slot.

[0014] In some embodiments, 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 rotor slits.

[0015] In some embodiments, 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 rotor slits.

[0016] In some embodiments, from the rotor shaft hole side to the rotor outer circle side, the area of ​​the slit grooves in each magnetic barrier layer on the first rotor lamination located within the inner hole of the second rotor lamination gradually decreases.

[0017] 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 / or 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.

[0018] In some embodiments, the radial width between the inner hole and the outer circle of the end ring is k9 on the d-axis and k10 on the q-axis, where 1.1 ≤ k9 / k10 ≤ 2.8.

[0019] In some implementations, 1.2 ≤ k9 / k10 ≤ 1.8.

[0020] In some embodiments, there is a center point on the plane of the side of the dividing rib near the outer circle of the rotor. 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 of the magnetic conductive channel formed between the filling grooves in the two adjacent magnetic barrier layers along the q-axis is W, where 0≤L<2W.

[0021] 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 two dividing ribs in any two adjacent magnetic barrier layers along the d-axis is L. The width of the air gap formed between the inner diameter of the stator and the outer diameter of the rotor is σ, where 0≤L<8σ.

[0022] In some embodiments, the width of the dividing rib of the outermost magnetic barrier layer near the outer circle of the rotor along the d-axis is L1, and the width of the dividing rib of the innermost magnetic barrier layer near the shaft hole along the d-axis is L2. L1 is not less than L2, and L1≥0.5*σ, where σ is the width of the air gap between the stator and the rotor.

[0023] In some implementations, within the first quadrant formed by the d and q axes, the distance between the center of the dividing rib and the d and q axes satisfies kq = -ν * kd + λ, where kq is the distance from the center of the dividing rib to the q axis, kd is the distance from the center of the dividing rib to the d axis, and 0.28 ≤ ν ≤ 0.46, 28 ≤ λ ≤ 33.

[0024] In some embodiments, the width of the slit groove on the q-axis decreases continuously in at least three layers in the direction away from the d-axis; and / or, the ratio of the sum of the widths of all slit grooves and the first filling groove on the q-axis (d1+∑d2) to the width d3 from the shaft hole to the outer circumference of the rotor is 0.2 to 0.5, where d1 is the width of the first filling groove on the q-axis and d2 is the width of the slit groove on the q-axis.

[0025] In some embodiments, the minimum width W1 of the magnetic channel between two adjacent filling slots is W1 ≥ d, where d is the minimum width of the magnetic channel formed between the slit slots corresponding to the two filling slots.

[0026] In some implementations, the minimum distance h1 of the magnetic channel between two adjacent magnetic barrier layers along the q-axis should satisfy h1≥1.5h2, where h2 is the minimum width along the q-axis of the magnetic barrier layer with the smaller width along the q-axis among the two adjacent magnetic barrier layers.

[0027] 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.

[0028] 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. 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.

[0029] 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.

[0030] 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.

[0031] 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, then 0.5≤k3 / k4≤1 or 0.5≤k4 / k3≤1.

[0032] In some embodiments, in the outermost 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 k5; in the innermost magnetic barrier layer near the rotor 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 k6, then 0.5≤k5 / k6≤1 or 0.5≤k6 / k5≤1.

[0033] In some embodiments, the first filling groove is located in the q-axis direction on the outer periphery of the rotor, has a segmented structure, and is composed of multiple q-axis filling grooves, with ribs between adjacent q-axis filling grooves.

[0034] In some embodiments, the first filling groove has a number of ribs of y, where 1 ≤ y ≤ 4.

[0035] In some embodiments, the width of the rib between any two adjacent q-axis filling grooves along the d-axis direction is L3, L3 > 0.1M1, L3 > 0.1M2, L3 > 0.05(M1+M2), where M1 and M2 are the maximum widths of the two adjacent q-axis filling grooves along the d-axis direction, respectively.

[0036] In some implementations, the sum of the widths of the ribs along the d-axis between any two adjacent q-axis filling grooves is ∑L3, where ∑L3 > 0.1∑(M1+M2), and ∑(M1+M2) is the sum of the widths of each q-axis filling groove along the d-axis.

[0037] In some implementations, the width difference between the ribs is within ±20%; and / or, the minimum width L3 of each rib should satisfy L3≥σ, where σ is the width of the air gap between the stator inner diameter and the rotor outer diameter.

[0038] In some implementations, the area difference of each q-axis filling groove is within ±30%.

[0039] In some embodiments, the angle between the two ends of the first filling groove and the line connecting the rotor center is α1, where 20°≤α1≤60°.

[0040] In some implementations, the length extension direction of the filling groove deviates from the parallel angle of the d-axis by no more than 5%.

[0041] 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 that are closer to the slit groove.

[0042] In some implementations, the ratio of the distance k12 from the first filling groove to the rotor center in the q-axis direction to the rotor radius Rr satisfies 0.82≤k12 / Rr≤0.96.

[0043] 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.

[0044] 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, 0.8 < k / k2 ≤ 1.6.

[0045] In some embodiments, the interval between the filling groove of the innermost magnetic barrier layer near the shaft hole side and the outer circle of the rotor is h3, and the interval between the outermost magnetic barrier layer near the outer circle of the rotor and the outer circle of the rotor is h4. Then h4≥h3, and 0≤h3≤2.5σ, where σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor.

[0046] 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.

[0047] In some embodiments, the width deviation of the filling groove along the q-axis direction from the outer circle side of the rotor to the q-axis of the rotor is no more than 5%.

[0048] In some embodiments, the first rotor lamination has at least five different types of filling grooves with different filling areas; 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.

[0049] In some implementations, the ratio τ of the maximum and minimum thicknesses of all filling grooves along the q-axis satisfies 1 ≤ τ ≤ 2.

[0050] In some embodiments, the width of each second filling groove gradually increases along the d-axis direction towards the d-axis.

[0051] 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.

[0052] In some embodiments, at least a portion of the first and second filling slots are filled with a conductive but non-magnetic material. The filling slots are self-short-circuited by end rings at both ends of the second rotor lamination to form a squirrel cage structure. The end ring material is the same as the filling material in the filling slots.

[0053] In some embodiments, the slit groove is composed of arc segments and / or straight segments. From the rotor shaft hole side to the rotor outer circle side, 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.

[0054] In some embodiments, from the rotor shaft hole side to the rotor outer circle side, 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%; and / or, the maximum width of the shaft hole in the q-axis direction is not greater than the maximum width of the shaft hole in the d-axis direction.

[0055] The present invention also provides a self-starting synchronous reluctance motor, including the motor rotor described above.

[0056] The present invention also provides a compressor, including the above-described self-starting synchronous reluctance motor.

[0057] The present invention provides a motor rotor and its self-starting synchronous reluctance motor and compressor. The q-axis direction of the second rotor lamination corresponds to the slit slot of the first rotor lamination. The radial width of the second rotor lamination on the q-axis is smaller than its radial width on the d-axis, which allows a sufficient area of ​​slit slots to directly contact the air, forming flow holes and increasing rotor heat dissipation. Attached Figure Description

[0058] Figure 1 This is a three-dimensional structural diagram of the motor rotor according to an embodiment of the present invention.

[0059] Figure 2 This is a schematic diagram (axial direction) of the first rotor lamination of the motor rotor according to an embodiment of the present invention;

[0060] Figure 3 This is a schematic diagram (axial direction) of the second rotor lamination of the motor rotor according to an embodiment of the present invention;

[0061] Figure 4 This is a schematic diagram (axial direction) of the electronic rotor according to an embodiment of the present invention;

[0062] 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;

[0063] Figure 6 This is a schematic diagram (axial direction) of the second rotor lamination of a motor rotor according to another embodiment of the present invention;

[0064] Figure 7 This is a schematic diagram (axial direction) of an electronic rotor according to another embodiment of the present invention;

[0065] Figure 8 This paper compares the temperature rise, losses, and efficiency of the motor using the technical solution of this invention with those of motors in the prior art.

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

[0067] 2. Second rotor lamination; 21. Connecting slot; 3. End ring; 4. First rotor lamination; 51. First filling slot; 511. q-shaft filling slot; 52. Second filling slot; 6. Slit slot; 7. Shaft hole; 8. Dividing rib; 9. Rib. Detailed Implementation

[0068] See also Figures 1 to 8 As shown in the embodiment of the present invention, the present invention provides a self-starting synchronous reluctance motor rotor. Through a special design of the rotor core, the rotor can increase the area of ​​the rotor in direct contact with the air, forming flow holes and increasing rotor heat dissipation.

[0069] The specific implementation method will be described below with reference to the rotor in the accompanying drawings. Figure 1 This is a schematic diagram of a motor rotor, which includes a first rotor lamination 4, a second rotor lamination 2, and an end ring 3. Figure 2 The diagram shows a first rotor lamination 4 according to a first embodiment. The first rotor lamination 4 has a filling groove, a slit groove 6, and a shaft hole 7. The filling groove 5 includes a first filling groove 51 and a second filling groove 52. The radial width between the inner hole and the outer circle of the second rotor lamination 2 at different positions, i.e., the distance between the two points where the line connecting the rotor center and the outer circle intersects the inner hole and the outer circle of the second rotor lamination 2, is not equal. Furthermore, the radial width of the second rotor lamination 2 on the d-axis is greater than its radial width on the q-axis. The q-axis direction of the second rotor lamination 2 corresponds to the slit groove 6 of the first rotor lamination 4. The radial width of the second rotor lamination 2 on the q-axis is less than its radial width on the d-axis, so that a sufficiently large area of ​​the slit groove 6 directly contacts the air, forming a flow hole and increasing rotor heat dissipation. Figure 8 The figure shows a comparison of motor temperature rise, losses, and efficiency between the technology of the present invention and the prior art. As can be seen from the figure, the motor temperature rise is low under the technology of the present invention, which can further reduce copper and aluminum losses and improve motor efficiency.

[0070] In some embodiments, the radial width kd1 of the second rotor lamination 2 on the d-axis and the radial width kq1 of the second rotor lamination 2 on the q-axis satisfy 1.1≤kd1 / kq1≤2.8, more preferably 1.2≤kd1 / kq1≤1.8. Limiting the ratio of the radial width of the second rotor lamination 2 on the d-axis to the radial width on the q-axis ensures that, on the one hand, kd1 is not too small, which would affect the radial thickness of the end ring 3 and thus the motor's starting capability; on the other hand, kd1 is not too large, which would affect the area of ​​the slit slot 6 directly in contact with the air and thus the rotor's heat dissipation.

[0071] In some embodiments, the total area of ​​the slots 6 on the first rotor lamination 4 located within the inner hole of the second rotor lamination 2 accounts for at least 20% of the total area of ​​the motor flow holes (stator flow holes and rotor flow holes), more preferably, this ratio is 25% to 40%. Limiting the total area of ​​the slots 6 located within the inner hole of the second rotor lamination 2 ensures that a sufficient area of ​​the slots 6 is in direct contact with the air, further improving rotor heat dissipation.

[0072] In some embodiments, the maximum width of the outer contour of the second rotor lamination 2 is not greater than the diameter of the outer circle of the first rotor lamination 4. As part of the rotor, the outer contour of the second rotor lamination 2 must not be greater than the outer circle of the first rotor lamination 4 so as to form an air gap with a certain width between it and the stator.

[0073] In some embodiments, the maximum width of the inner hole of the second rotor lamination 2 on the q-axis is not less than the maximum width on the d-axis, and the ratio of the maximum width of the inner hole of the second rotor lamination 2 on the q-axis to the maximum width on the d-axis is 1 to 1.5. The maximum width of the inner hole of the second rotor lamination 2 on the q-axis is not less than the maximum width on the d-axis to ensure that a sufficient area of ​​the slit groove 6 directly contacts the air, forming a flow hole and increasing rotor heat dissipation; limiting the ratio of the maximum width of the inner hole of the second rotor lamination 2 on the q-axis to the maximum width on the d-axis further ensures that a sufficient area of ​​the slit groove 6 directly contacts the air.

[0074] In some embodiments, the thickness of the second rotor lamination 2 along the stacking direction of the first rotor lamination 4 is not less than the thickness of a single first rotor lamination 4, so as to ensure the mechanical strength of the rotor.

[0075] In some embodiments, the total area of ​​the connecting grooves 21 on the second rotor lamination 2 is not greater than the total area of ​​the filling grooves provided on the first rotor lamination 4. The connecting grooves 21 on the second rotor lamination 2 are the inlets for filling material into the filling grooves on the first rotor lamination 4. The connecting grooves 21 on the second rotor lamination 2 allow the filling material to enter the filling grooves on the first rotor lamination 4. Ensuring that the total area of ​​the connecting grooves 21 on the second rotor lamination 2 is not greater than the total area of ​​the filling grooves provided on the first rotor lamination 4 reduces the stress area of ​​the non-filling groove portion of the first rotor lamination 4 during material filling, ensuring its mechanical strength during the material filling process and reducing deformation.

[0076] In some embodiments, the connecting groove 21 provided on the second rotor lamination 2 is in the same position as the filling groove provided on the first rotor lamination 4. For filling grooves in the same position, the area of ​​a single connecting groove 21 on the second rotor lamination 2 is not greater than the area of ​​a single filling groove on the first rotor lamination 4, so as to reduce the local deformation of the first rotor lamination 4 when filling material.

[0077] In some embodiments, the width along the d-axis between the inner hole of the second rotor lamination 2 and the connecting groove 21 should be greater than the width of the dividing rib 8 between the connecting groove 21 and the slit groove 6, so as to ensure that the slit groove 6 is not filled during the manufacturing process of the rotor.

[0078] In some embodiments, the total area of ​​the slits 6 on the first rotor lamination 4 located within the inner hole of the second rotor lamination 2 accounts for at least 30% of the total area of ​​the rotor slits 6, more preferably 45% to 65%, to ensure that a sufficient area of ​​slits 6 is in direct contact with air, forming flow holes and increasing rotor heat dissipation.

[0079] In some embodiments, from the rotor shaft hole side to the rotor outer circle side, the area of ​​the slots 6 in each magnetic barrier layer on the first rotor lamination 4 located within the inner hole of the second rotor lamination 2 gradually decreases. At this time, the end ring 3 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 3 has a certain volume to improve the motor starting capability.

[0080] In some embodiments, the maximum width of the outer contour of the end ring 3 is not greater than the maximum width of the outer contour of the second rotor lamination 2, and the maximum distance from the center of the rotor core to the end face of the end ring 3 is not less than the maximum distance from the center of the rotor core to the end face of the second rotor lamination 2. The maximum width of the outer contour of the end ring 3 is not greater than the maximum width of the outer contour of the second rotor lamination 2 to ensure that the portion of the first rotor lamination 4 located on the outer circle side of the rotor that is not covered by the second rotor lamination 2 is subjected to stress during material filling, thus reducing local deformation. The maximum distance from the center of the rotor core to the end face of the end ring 3 is not less than the maximum distance from the center of the rotor core to the end face of the second rotor lamination 2, ensuring that the rotor has an end ring 3 with a certain volume, which helps to improve the motor's starting capability.

[0081] In some embodiments, the radial width between the inner hole and the outer circle of the end ring 3 is k9 on the d-axis and k10 on the q-axis, then 1.1≤k9 / k10≤2.8, and more preferably 1.2≤k9 / k10≤1.8. The inner filling groove near the shaft hole side has a larger width along the d-axis direction. In order to make the filling groove self-short-circuit, the radial width of the end ring 3 in the d-axis direction is larger; in order to ensure the area of ​​the slit groove 6 in direct contact with air, the radial width of the end ring 3 in the d-axis direction cannot be too large.

[0082] In some embodiments, in each magnetic barrier layer structure consisting of a second filling groove 52 and a slit groove 6, there is a dividing rib 8 between the second filling groove 52 and the slit groove 6. The plane containing the side edge of the dividing rib 8 closest to the outer circle of the rotor has a center point. The distance between the two center points corresponding to two dividing ribs 8 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. L should satisfy 0 ≤ L < 2W, more preferably 0 ≤ L < W, and most preferably 0 ≤ L ≤ 0.8W. 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.

[0083] 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 8 closest to the outer circle of the rotor. As a specific implementation method, such as... Figure 2As shown, the aforementioned plane is a parallelogram plane extending along the axial direction of the first rotor lamination 4. The geometric center point of this parallelogram plane, which is also the intersection of its diagonals, is the midpoint of the side length of the dividing rib 8 on the side closest to the outer circle of the rotor after being projected onto the axial direction of the first rotor lamination 4.

[0084] In some embodiments, the plane containing the side edge of the dividing rib 8 closest to the outer circle of the rotor has a center point. The distance between the two center points corresponding to two dividing ribs 8 in any two adjacent magnetic barrier layers along the d-axis is L. The width of the air gap formed between the inner diameter of the stator and the outer diameter of the rotor is σ. Then L should satisfy 0 < L < 8σ, more preferably 0 ≤ L ≤ 6σ. The dividing rib 8 can enhance the mechanical strength of the rotor, reduce rotor deformation during manufacturing, and reduce process difficulty. Limiting the relative distance of the dividing ribs 8 between each filling groove and slit groove 6 of the rotor can increase the area of ​​pressure-bearing between two adjacent magnetic barrier layers, forming a mutual support effect, thereby reducing rotor deformation during manufacturing and reducing process difficulty.

[0085] In some embodiments, the width of the dividing rib 8 of the outermost magnetic barrier layer near the outer circumference of the rotor along the d-axis is L1, and the width of the dividing rib 8 of the innermost magnetic barrier layer near the shaft hole side along the d-axis is L2. L1 is not less than L2, and L1 ≥ 0.5 * σ, where σ is the width of the air gap between the stator and the rotor. Limiting the minimum width of the dividing rib 8 can reduce the processing difficulty and improve the mechanical strength of the rotor; L1 ≥ L2 can reduce the leakage flux of the inner magnetic barrier layer and improve the motor efficiency.

[0086] In some implementations, the plane on which the side of the dividing rib 8 is located is parallel to or intersects the plane on which the q axis is located. That is, the shape of the dividing rib 8 is not limited to a rectangle, trapezoid, or arc. The structure of the dividing rib 8 can be flexibly selected according to the direction of the leakage magnetic field lines to reduce leakage magnetic flux.

[0087] In some implementations, within the first quadrant formed by the d and q axes, the distance between the center of the dividing rib 8 and the d and q axes satisfies kq = -ν * kd + λ, where kq is the distance from the center of the dividing rib 8 to the q axis, kd is the distance from the center of the dividing rib 8 to the d axis, the coefficient ν satisfies 0.28 ≤ ν ≤ 0.46 (dimensionless), and the coefficient λ satisfies 28 ≤ λ ≤ 33 (dimensions consistent with kq and kd), thereby limiting the position and width of the dividing rib 8 and reducing the risk of rotor deformation.

[0088] In some embodiments, the width of the slit slot 6 on the q-axis decreases continuously in at least three layers away from the d-axis; the ratio of the sum of the widths of all slit slots 6 and the first filling slot 51 on the q-axis (d1 + ∑d2) to the width d3 from the shaft hole 7 to the outer circumference of the rotor is 0.2 to 0.5, i.e., (d1 + ∑d2) / d3 = 0.2 to 0.5, more preferably, this ratio is 0.3 to 0.4, where d1 is the width of the first filling slot 51 on the q-axis and d2 is the width of the slit slot on the q-axis. The aim is to select a reasonable magnetic barrier ratio, ensuring both sufficient magnetic barrier width and a reasonable magnetic flux channel, increasing the motor saliency ratio while preventing magnetic circuit oversaturation.

[0089] In some embodiments, the minimum width W1 of the magnetic channel between two adjacent filling slots should satisfy W1≥d, where d is the minimum width of the magnetic channel formed between the slit slots 6 corresponding to the two filling slots; 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 and affect the magnetic flux flow of the channel between the magnetic barrier layers.

[0090] In some implementations, the minimum distance h1 of the magnetic channel between two adjacent magnetic barrier layers along the q-axis should satisfy h1≥1.5h2, where h2 is the minimum width along the q-axis of the magnetic barrier layer with the smaller width among the two adjacent magnetic barrier layers. This setting can reduce the difficulty of rotor processing and ensure the uniformity and unsaturation of rotor magnetic flux density distribution.

[0091] In some implementations, a magnetic channel is formed between 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 7 has a greater interaction with the stator and a greater impact on motor performance. This arrangement, while making reasonable use of rotor space, ensures the width of the magnetic channel near the shaft hole, which helps improve motor performance. A magnetic channel is formed between 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 (the width of the magnetic channel is defined as the shortest distance from each point on one side of the magnetic channel to the other side). 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 arrangement helps reduce rotor magnetic flux saturation and motor losses.

[0092] In some embodiments, the ratio of the width of the slit groove 6 along the q-axis to the width of the slit groove 6 near the end of the filling groove in each magnetic barrier layer is τ1, which gradually increases from the innermost to the outermost magnetic barrier layer. This ensures both the width of the magnetic conductive channel between the inner magnetic barrier layers and a certain proportion of magnetic barrier layers, thus improving motor performance. 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 6 along the q-axis in each magnetic barrier layer is τ2, where τ2 > 1.4, 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 also ensures the width of the magnetic conductive channel between the filling grooves.

[0093] In some embodiments, 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 52 located at both ends of the slit groove 6 near the slit groove 6 is k3; in the adjacent inner magnetic barrier layer near the shaft hole, the width along the d-axis between the ends of the two second filling grooves 52 located at both ends of the slit groove 6 near the slit groove 6 is k4, then 0.5≤k3 / k4≤1 or 0.5≤k4 / k3≤1. Given the limited rotor space, this arrangement can increase the area of ​​the filling grooves and improve the motor's starting capability.

[0094] In some embodiments, in the outermost 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 52 located at both ends of the slit groove 6 near the slit groove 6 is k5; in the innermost magnetic barrier layer near the rotor shaft hole, the width along the d-axis between the ends of the two second filling grooves 52 located at both ends of the slit groove 6 near the slit groove 6 is k6, then 0.5≤k5 / k6≤1 or 0.5≤k6 / k5≤1. Given the limited rotor space, this arrangement can increase the area of ​​the filling grooves and improve the motor's starting capability.

[0095] In some embodiments, the first filling groove 51 is located in the q-axis direction on the outer periphery of the rotor and has a segmented structure, consisting of multiple q-axis filling grooves 511, with ribs 9 between adjacent q-axis filling grooves 511. The number of ribs 9 in the first filling groove 51 is y, where y satisfies 1≤y≤4. The outermost magnetic barrier layer composed of the first filling grooves 51 near the outer circumference of the rotor is the part of the rotor most prone to deformation. Dividing the outermost first filling groove 51 into multiple q-axis filling grooves 511 can reduce rotor deformation at this location.

[0096] In some embodiments, the width of the rib 9 between any two adjacent q-axis filling slots 511 along the d-axis direction is L3. L3 should satisfy L3 > 0.1M1, L3 > 0.1M2, and L3 > 0.05(M1 + M2), where M1 and M2 are the maximum widths of the two adjacent q-axis filling slots 511 along the d-axis direction. Limiting the maximum width of the q-axis filling slots 511 along the d-axis direction can reduce the saturation of the channels between the outer magnetic barrier layers of the rotor, which helps to reduce motor harmonics, reduce torque pulsation, reduce harmonic losses, and improve motor efficiency and operational stability. Simultaneously, limiting the width of the rib 9 between each q-axis filling slot 511 can ensure the force-bearing area of ​​the outermost magnetic barrier layer of the rotor, further enhancing the mechanical strength of the rotor, reducing rotor deformation during manufacturing, and reducing process difficulty.

[0097] In some embodiments, the sum of the widths of the ribs 9 along the d-axis between any two adjacent q-axis filling slots 511 is ∑L3 (the values ​​of each L3 may be equal or unequal), then ∑L3 > 0.1∑(M1+M2), where ∑(M1+M2) is the sum of the widths of each q-axis filling slot 511 along the d-axis. This arrangement can ensure the mechanical strength of the rotor in some embodiments.

[0098] In some implementations, the width difference between each rib 9 is within ±20%, and the minimum width L3 of each rib 9 should satisfy L3≥σ, where σ is the width of the air gap between the stator inner diameter and the rotor outer diameter, in order to reduce the local deformation of the rotor at the outermost magnetic barrier layer.

[0099] In some implementations, the width of the same rib 9 along the d-axis may be equal or unequal at different locations, meaning the shape of the rib 9 is not limited to rectangular, trapezoidal, or arc-shaped. The same rib 9 can have a larger width along the d-axis in areas with a high risk of local deformation, and a smaller width along the d-axis in areas with a low risk of local deformation.

[0100] In some embodiments, the area difference of each q-axis filling groove 511 is within ±30%, and more preferably, the area difference of each q-axis filling groove 511 is within ±15%. This arrangement ensures that the area of ​​pressure borne by each part of the outermost magnetic barrier layer is not significantly different, thus avoiding local deformation.

[0101] In some embodiments, the angle α1 between the two ends of the first filling groove 51 and the line connecting it to the rotor center should satisfy 20°≤α1≤60°, more preferably, α1 should satisfy 30°≤α1≤50°, and most preferably, α1 should satisfy 30°≤α1≤35°. This configuration forms a magnetic barrier layer and serves as the filling groove, which can both increase the reluctance torque of the motor and act as a starting squirrel cage to improve the motor's starting performance.

[0102] In some embodiments, the filling grooves, including a first filling groove 51 and a second filling groove 52, extend in a direction approximately parallel to the d-axis with an angular deviation of no more than 5%. They extend in a direction parallel to the d-axis to form a smooth magnetic channel with the adjacent magnetic barrier layer.

[0103] In some embodiments, the width of the first filling groove 51 along the d-axis is smaller than the width along the d-axis between the ends of the two second filling grooves 52 in the adjacent magnetic barrier layer near the slit groove 6. The purpose of this arrangement is to limit the width of the first filling groove 51 along the d-axis to avoid deformation of the rotor toward the shaft hole side or the outer circle side due to excessive width.

[0104] In some embodiments, the ratio of the distance k12 from the first filling groove 51 to the rotor center in the q-axis direction to the rotor radius Rr satisfies 0.82 ≤ k12 / Rr ≤ 0.96. If k12 / Rr is too small, the outermost magnetic channel will be too narrow, increasing motor losses and reducing efficiency; if k12 / Rr is too large, the distance between the first filling groove 51 and the outer circle of the rotor will be too small, increasing 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. This ensures the width of the magnetic channel between the innermost magnetic barrier layer and the shaft, reducing rotor magnetic saturation, and also enhances the mechanical strength of the rotor near the shaft. 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.

[0105] In some embodiments, the maximum thickness of the first filling groove 51 along the q-axis is k, the maximum thickness of the second filling groove 52 in the adjacent magnetic barrier layer along the q-axis is k1, and the minimum thickness of the adjacent magnetic conductive channel along the q-axis is k2. Therefore, 1 < k / k1 ≤ 2, and 0.8 < k / k2 ≤ 1.6. This ensures both the thickness of the first filling groove 51 along the q-axis to reduce processing difficulty and the width of the outermost magnetic conductive channel to improve motor performance.

[0106] In some embodiments, the distance between the innermost magnetic barrier layer's filling groove near the shaft hole and the rotor's outer circle is h3, and the distance between the outermost magnetic barrier layer near the rotor's outer circle and the rotor's outer circle is h4. Therefore, h4 ≥ h3, and 0 ≤ h3 ≤ 2.5σ, where σ is the width of the air gap between the stator's inner diameter and the rotor's outer diameter. 0 ≤ h3 ≤ 2.5σ indicates that the filling groove is either an open or closed groove. When the filling groove is a closed groove, limiting its maximum distance from the rotor's outer circle can reduce magnetic leakage. h4 ≥ h3 can reduce magnetic leakage in the inner magnetic barrier layer while ensuring the mechanical strength at the outer magnetic barrier layer.

[0107] In some embodiments, the maximum width along the q-axis of the end of the filling groove 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 q-axis of the rotor. More preferably, the width of the filling groove along the q-axis is approximately equal from the outer circle of the rotor to the q-axis, with a width deviation of no more than 5%. This ensures the width of the magnetic channel near the air gap between the rotor magnetic barrier layers and reduces rotor saturation. Setting the width of the filling groove along the q-axis to be approximately equal can increase the area of ​​the filling groove while ensuring the width of the magnetic channel near the air gap, which helps to improve start-up.

[0108] In some embodiments, the motor rotor includes at least five different types of filling slots; the total area of ​​the first filling slot 51 and the second filling slot 52 should account for 30% to 70% of the total area of ​​the rotor slots, more preferably 35% to 50%. Ensuring a certain proportion of filling slot area enables the motor to have a certain load-bearing starting capability.

[0109] In some implementations, the ratio τ of the maximum and minimum thicknesses of all filler grooves along the q-axis satisfies 1 ≤ τ ≤ 2; more preferably 1.3 ≤ τ ≤ 1.5. Limiting this ratio prevents the magnetic channel width from becoming too small due to excessive filler groove thickness along the q-axis, thus affecting efficiency, and also prevents the filler groove area from becoming too small due to insufficient filler groove thickness along the q-axis, thus affecting startup.

[0110] In some embodiments, the width of each second filling groove 52 gradually increases along the d-axis direction towards the d-axis; more preferably, the maximum width of each second filling groove 52 increases continuously in at least three layers along the d-axis direction towards the d-axis; most preferably, the maximum width of each second filling groove 52 continuously decreases along the d-axis direction from the second magnetic barrier layer near the d-axis to the magnetic barrier layer near the outer circumference of the rotor, 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.

[0111] In some embodiments, the filling slots, including at least a portion of the first filling slot 51 and the second filling slot 52, are filled with a conductive but non-magnetic material. The filling slots are self-short-circuited by end rings 3 at both ends of the second rotor lamination 2, forming a squirrel cage structure. The end rings 3 are made of the same material as the filling material in the filling slots. The self-short-circuited squirrel cage structure provides asynchronous torque during the motor starting phase to achieve self-starting of the motor; the multi-layer magnetic barrier structure provides reluctance torque to the motor to achieve synchronous operation.

[0112] In some embodiments, the slit slot 6 is composed of arc segments and / or straight segments. From the rotor shaft hole side to the rotor outer circle side, the curvature of the arc segments of the slit slot 6 gradually increases, and the curvature of the outer circle of the slit slot 6 in the same layer is greater than that of the inner circle. The arc segments protrude away from the shaft hole side. Alternatively, both ends of the slit slot 6 extend into straight segments along the d-axis direction, and some or all of the ends of the slit slot 6 are parallel to the d-axis. The width of the slit slot 6 gradually increases from the middle position (q-axis) to both ends (d-axis). A shaft hole 7 is opened in the middle of the rotor. This arrangement can increase the utilization rate of rotor space and rationally arrange the slit slots 6 to increase the rotor salient pole ratio and improve the motor reluctance torque.

[0113] In some embodiments, from the rotor shaft hole side to the rotor outer circle side, the curve length between the ends of each layer of slit slots 6 near the two second filling grooves 52 gradually decreases, and the decrease ratio of the curve length of adjacent slit slots 6 is 5% to 25%. A shaft hole 7 is provided in the middle of the rotor. The purpose of this arrangement is to ensure a certain proportion of magnetic barrier layer while making reasonable use of rotor space, thereby improving motor performance.

[0114] In some embodiments, the maximum width of the shaft hole 7 in the q-axis direction is not greater than the maximum width of the shaft hole 7 in the d-axis direction. A slit slot 6 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 6, thereby increasing the rotor salient pole ratio and improving the motor reluctance torque.

[0115] In some embodiments, the shaft hole 7 is composed of arc segments and / or straight segments, that is, the shape of the shaft hole 7 is not limited to a circle, an ellipse, a near-ellipse, or a quadrilateral, and the shape of the shaft hole 7 can be flexibly selected according to the arrangement of the slit groove 6.

[0116] Balance blocks are installed on the end rings 3 at both ends of the rotor. The balance blocks are placed on the side with the larger radial width between the inner hole and the outer circle of the end ring 3.

[0117] 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 increase the area of ​​the rotor directly in contact with air, forming flow holes to enhance rotor heat dissipation.

[0118] 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.

[0119] 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.

[0120] According to an embodiment of the present invention, a compressor is also provided, including the self-starting synchronous reluctance motor described above.

[0121] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0122] 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 (4) and a second rotor lamination (2). The first rotor lamination (4) has a filling groove and a slit groove (6). The filling groove includes a second filling groove (52) and a first filling groove (51). The first rotor lamination (4) 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 (51). The inner magnetic barrier layer includes a slit groove (6) and a second filling groove (52) located at both ends of the slit groove (6). Within the same inner magnetic barrier layer, there is a dividing rib between the second filling groove (52) and the slit groove (6). 8) The second rotor lamination (2) is set between the end ring (3) and the first rotor lamination (4). A connecting groove (21) is provided on the second rotor lamination (2) corresponding to the filling groove. The radial width between the inner hole and the outer circle of the second rotor lamination (2) is not equal at different positions, and the radial width of the second rotor lamination (2) on the d axis is greater than its radial width on the q axis. There is a center point in the plane of the side of the dividing rib (8) near the outer circle of the rotor. The distance between the two center points corresponding to the two dividing ribs (8) in any two adjacent magnetic barrier layers along the d axis is L. The maximum distance of the magnetic channel formed between the filling grooves in the two adjacent magnetic barrier layers along the q axis is W, 0≤L<2W.

2. The motor rotor according to claim 1, characterized in that, The radial width kd1 of the second rotor lamination (2) on the d axis and its radial width kq1 on the q axis satisfy 1.1≤kd1 / kq1≤2.

8.

3. The motor rotor according to claim 2, characterized in that, 1.2≤kd1 / kq1≤1.

8.

4. The motor rotor according to claim 1, characterized in that, The total area of ​​the slit groove (6) located on the inner circumferential side of the inner hole of the second rotor lamination (2) on the first rotor lamination (4) accounts for at least 20% of the total area of ​​the motor flow hole, which includes the rotor flow hole and the stator flow hole.

5. The motor rotor according to claim 4, characterized in that, The total area of ​​the slit groove (6) located on the inner circumference of the inner hole of the second rotor lamination (2) on the first rotor lamination (4) accounts for 25% to 40% of the total area of ​​the motor flow hole.

6. The motor rotor according to claim 1, characterized in that, The maximum width of the outer contour of the second rotor lamination (2) is not greater than the outer diameter of the first rotor lamination (4); and / or, the axial thickness of the second rotor lamination (2) is not less than the thickness of a single first rotor lamination (4).

7. The motor rotor according to claim 1, characterized in that, The maximum width of the inner hole of the second rotor lamination (2) on the q axis is not less than the maximum width on the d axis, and the ratio of the maximum width of the inner hole of the second rotor lamination (2) on the q axis to the maximum width on the d axis is 1~1.5; and / or, the total area of ​​the connecting groove (21) on the second rotor lamination (2) is not greater than the total area of ​​the filling groove provided on the first rotor lamination (4).

8. The motor rotor according to claim 1, characterized in that, The connecting groove (21) provided on the second rotor lamination (2) is in the same position as the filling groove provided on the first rotor lamination (4). The area of ​​a single connecting groove (21) on the second rotor lamination (2) is not greater than the area of ​​a single filling groove on the first rotor lamination (4); and / or, the width of the inner hole of the second rotor lamination (2) and the connecting groove (21) along the d-axis direction should be greater than the width of the dividing rib (8) between the second filling groove (52) and the slit groove (6) corresponding to the position of the connecting groove (21).

9. The motor rotor according to claim 1, characterized in that, The total area of ​​the slit groove (6) on the first rotor lamination (4) located within the inner hole of the second rotor lamination (2) accounts for at least 30% of the total area of ​​the rotor slit groove (6).

10. The motor rotor according to claim 9, characterized in that, The total area of ​​the slit groove (6) on the first rotor lamination (4) located inside the inner hole of the second rotor lamination (2) accounts for 45% to 65% of the total area of ​​the rotor slit groove (6).

11. The motor rotor according to claim 1, characterized in that, From the rotor shaft hole side to the rotor outer circle side, on the q axis, the area of ​​the slit groove (6) in each layer of magnetic barrier layer on the first rotor lamination (4) located within the inner hole of the second rotor lamination (2) gradually decreases.

12. The motor rotor according to claim 1, characterized in that, The maximum width of the outer contour of the end ring (3) is not greater than the maximum width of the outer contour of the second rotor lamination (2), and / or the maximum distance from the center of the rotor core to the end face of the end ring (3) is not less than the maximum distance from the center of the rotor core to the end face of the second rotor lamination (2).

13. The motor rotor according to claim 1, characterized in that, The radial width between the inner hole and the outer circle of the end ring (3) is k9 on the d axis and k10 on the q axis, 1.1≤k9 / k10≤2.

8.

14. The motor rotor according to claim 13, characterized in that, 1.2≤k9 / k10≤1.

8.

15. The motor rotor according to claim 1, characterized in that, There is a center point on the plane of the side edge of the dividing rib (8) near the outer circle of the rotor. The distance between the two center points of the two dividing ribs (8) in any two adjacent magnetic barrier layers along the d-axis is L. The width of the air gap formed between the inner diameter of the stator and the outer diameter of the rotor is σ, 0≤L<8σ; or, the width of the dividing rib (8) of the outermost magnetic barrier layer near the outer circle of the rotor along the d-axis is L1, and the width of the dividing rib (8) of the innermost magnetic barrier layer near the rotor shaft hole along the d-axis is L2. L1 is not less than L2, and L1≥0.5*σ, where σ is the width of the air gap between the stator and the rotor.

16. The motor rotor according to claim 1, characterized in that, Within the first quadrant formed by the d and q axes, the distance between the center of the dividing rib (8) and the d and q axes satisfies kq=-ν*kd+λ, where kq is the distance from the center of the dividing rib (8) to the q axis, kd is the distance from the center of the dividing rib (8) to the d axis, 0.28≤ν≤0.46, 28≤λ≤33.

17. The motor rotor according to claim 1, characterized in that, In the direction away from the d-axis, the width of the slit groove (6) on the q-axis decreases continuously in at least 3 layers; and / or, the sum of the widths of all slit grooves (6) and the first filling groove (51) on the q-axis (d1+∑d2) is 0.2~0.5 to the width d3 of the shaft hole (7) of the first rotor lamination (4) to the outer circumference of the rotor, where d1 is the width of the first filling groove (51) on the q-axis and d2 is the width of the slit groove (6) on the q-axis.

18. The motor rotor according to claim 1, characterized in that, The minimum width W1 of the magnetic channel between two adjacent filling slots, W1≥d, where d is the minimum width of the magnetic channel formed between the slit slots (6) corresponding to the two filling slots.

19. The motor rotor according to claim 1, characterized in that, The minimum distance h1 of the magnetic channel between two adjacent magnetic barrier layers along the q-axis should satisfy h1≥1.5h2, where h2 is the minimum width along the q-axis of the magnetic barrier layer with the smaller width along the q-axis among the two adjacent magnetic barrier layers; or, a magnetic channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic channel along the q-axis gradually decreases in the direction away from the d-axis.

20. The motor rotor according to claim 19, 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.

21. The motor rotor according to claim 1, characterized in that, In each magnetic barrier layer, the ratio of the width of the slit groove (6) on the q axis to the width of the slit groove (6) near the end of the filling groove is τ1, and τ1 gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer; and / or, 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 (6) on the q axis is τ2, and τ2 > 1.

4.

22. The motor rotor according to claim 1, characterized in that, In each inner magnetic barrier layer, in the outermost 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 (52) located at both ends of the slit groove (6) on the side near the slit groove (6) is k5; in the innermost magnetic barrier layer near the rotor shaft hole, the width along the d-axis between the ends of the two second filling grooves (52) located at both ends of the slit groove (6) on the side near the slit groove (6) is k6. Then 0.5≤k5 / k6≤1 or 0.5≤k6 / k5≤1.

23. The motor rotor according to claim 1, characterized in that, The first filling groove (51) is located on the q-axis direction of the outer periphery of the rotor. It has a segmented structure and is composed of multiple q-axis filling grooves (511). There are ribs (9) between two adjacent q-axis filling grooves (511).

24. The motor rotor according to claim 23, characterized in that, The first filling groove (51) has a number of ribs (9) of y, 1≤y≤4; and / or, the width of the ribs (9) between any two adjacent q-axis filling grooves (511) along the d-axis direction is L3, L3>0.1M1, L3>0.1M2, L3>0.05(M1+M2), where M1 and M2 are the maximum widths of any two adjacent q-axis filling grooves (511) along the d-axis direction.

25. The motor rotor according to claim 23, characterized in that, The sum of the widths of the ribs (9) between any two adjacent q-axis filling grooves (511) along the d-axis direction is ∑L3, ∑L3>0.1∑(M1+M2), where ∑(M1+M2) is the sum of the widths of each q-axis filling groove (511) along the d-axis direction.

26. The motor rotor according to claim 23, characterized in that, The width difference between each rib (9) is within ±20%; and / or, the minimum width L3 of each rib (9) should satisfy L3≥σ, where σ is the width of the air gap between the stator inner diameter and the rotor outer diameter.

27. The motor rotor according to claim 23, characterized in that, The area difference of each q-axis filling groove (511) is within ±30%.

28. The motor rotor according to claim 1, characterized in that, The angle between the two ends of the first filling groove (51) and the line connecting the rotor center is α1, 20°≤α1≤60°.

29. The motor rotor according to claim 1, characterized in that, The width of the first filling groove (51) along the d-axis direction is less than the width along the d-axis direction between the ends of the two second filling grooves (52) in the adjacent magnetic barrier layer that are close to the slit groove (6); and / or, the ratio of the distance k12 from the first filling groove (51) to the rotor center in the q-axis direction to the rotor radius Rr satisfies 0.82≤k12 / Rr≤0.

96.

30. The motor rotor according to claim 1, characterized in that, The ratio of the distance between the innermost magnetic barrier layers near the rotor 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 innermost magnetic barrier layer near the rotor shaft hole on the q-axis and the width of the shaft on the q-axis is greater than 2.

31. The motor rotor according to claim 1, characterized in that, The maximum thickness of the first filling groove (51) along the q-axis is k, the maximum thickness of the second filling groove (52) 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, 0.8 < k / k2 ≤ 1.6; or, the interval between the filling groove of the innermost magnetic barrier layer near the rotor shaft hole and the outer circle of the rotor is h3, and the interval between the outer magnetic barrier layer and the outer circle of the rotor is h4. Then h4 ≥ h3, and 0 ≤ h3 ≤ 2.5σ, where σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor.

32. The motor rotor according to claim 1, characterized in that, The maximum width of the ends of the first filling groove (51) and the second filling groove (52) near the outer circle of the rotor along the q-axis direction 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 direction.

33. The motor rotor according to claim 1, characterized in that, The first rotor lamination (4) has at least five different filling grooves with different filling areas, including a first filling groove (51) and a second filling groove (52); and / or, the total filling area of ​​the first filling groove (51) and the second filling groove (52) accounts for 30% to 70% of the total area of ​​the first filling groove (51), the second filling groove (52) and the slit groove (6).

34. The motor rotor according to claim 1, characterized in that, The ratio τ of the maximum and minimum thicknesses of all filling grooves along the q-axis satisfies 1≤τ≤2; or, towards the d-axis, the width of each second filling groove (52) gradually increases along the d-axis.

35. The motor rotor according to claim 34, characterized in that, In the direction closer to the d-axis, the maximum width of each second filling groove (52) 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 (52) along the d-axis direction decreases continuously.

36. The motor rotor according to claim 1, characterized in that, At least part of the first filling groove (51) and the second filling groove (52) are filled with a conductive but non-magnetic material. The filling grooves are self-short-circuited by the end rings (3) at both ends of the second rotor lamination (2) to form a squirrel cage structure. The material of the end rings (3) is the same as the filling material in the filling groove.

37. The motor rotor according to claim 1, characterized in that, The slit groove (6) is composed of arc segments and / or straight segments. From the rotor shaft hole side to the rotor outer circle side, the arc of the arc segment of the slit groove (6) gradually increases, and the arc of the outer circle of the slit groove (6) in the same layer is greater than the arc of the inner circle. The arc segment protrudes away from the rotor shaft hole side; or, the two ends of the slit groove (6) extend into straight segments along the d-axis direction. The two ends of part or all of the slit groove (6) are parallel to the d-axis. The width of the slit groove (6) gradually increases from the middle position of the slit groove (6) to both ends.

38. The motor rotor according to claim 1, characterized in that, From the rotor shaft hole side to the rotor outer circle side, the curve length between the ends of each layer of slit groove (6) near the two second filling grooves (52) gradually decreases, and the curve length of adjacent slit grooves (6) decreases by 5% to 25%; and / or, the maximum width of the shaft hole (7) of the first rotor lamination (4) in the q-axis direction is not greater than the maximum width of the shaft hole (7) of the first rotor lamination (4) in the d-axis direction.

39. A self-starting synchronous reluctance motor, characterized in that, The motor rotor includes any one of claims 1 to 38.

40. A compressor, characterized in that, Including the self-starting synchronous reluctance motor as described in claim 39.

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