Motor rotor and self-starting synchronous reluctance motor and compressor

Abstract

The application provides a motor rotor and a self-starting synchronous reluctance motor and a compressor, wherein the motor rotor comprises a first rotor lamination and a second rotor lamination, the first rotor lamination is provided with a slit groove, a second filling groove and a first filling groove, an outer magnetic barrier layer comprises the first filling groove, an inner magnetic barrier layer comprises the slit groove and the second filling groove at both ends of the slit groove, the second filling groove and the slit groove are provided with a split rib in the same layer of the inner magnetic barrier layer, the second rotor lamination is arranged between an end ring and the first rotor lamination, the second rotor lamination is provided with a communication groove corresponding to the filling groove, and 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. According to the application, by limiting the size relationship of the inner hole of the second rotor lamination on the q-axis and the d-axis, enough area of the slit groove can directly contact air to form a flow-through hole and increase rotor heat dissipation.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor design, and in particular relates to a motor rotor and a self-starting synchronous reluctance motor and a compressor thereof. Background Art

[0002] Self-starting synchronous reluctance motors (SRMs) combine the advantages of asynchronous motors with those of synchronous reluctance motors. They achieve self-starting through the asynchronous torque generated by the rotor bars, eliminating the need for a frequency converter. Compared to asynchronous motors, they offer constant speed operation, low rotor losses, and improved efficiency during synchronous operation. Compared to asynchronous-start permanent magnet synchronous motors, they eliminate the use of permanent magnets, resulting in lower costs and no permanent magnet demagnetization. However, the multi-layered magnetic barrier structure of SRMs can hinder heat dissipation. Summary of the Invention

[0003] Therefore, the present invention provides a motor rotor and a self-starting synchronous reluctance motor and a compressor thereof, which can overcome the disadvantage that the motor rotor of the self-starting synchronous reluctance motor in the related art has a multi-layer magnetic barrier layer structure, which makes it difficult to dissipate heat from the motor.

[0004] In order to solve the above problems, the present invention provides a motor rotor, including a rotor core, the rotor core including a first rotor punching and a second rotor punching, the first rotor punching is provided with a filling groove and a slit slot, the filling groove includes a second filling groove and a first filling groove, the first rotor punching 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 between the two outer magnetic barrier layers, the outer magnetic barrier layer includes a first filling groove, the inner magnetic barrier layer includes a slit slot and a second filling groove at both ends of the slit slot, in the same layer of inner magnetic barrier layer, there is a dividing rib between the second filling groove and the slit slot, the second rotor punching is arranged between the end ring and the first rotor punching, and a connecting groove is provided on the second rotor punching corresponding to the filling groove, and the maximum width of the inner hole of the second rotor punching on the q-axis is not less than the maximum width on the d-axis.

[0005] In some embodiments, the maximum width of the outer contour of the second rotor punching is not greater than the outer diameter of the first rotor punching; and / or the axial thickness of the second rotor punching is not less than the thickness of the single-piece first rotor punching.

[0006] In some embodiments, the width between the inner hole of the second rotor punching and the communicating groove along the d-axis direction is greater than the width of the dividing rib between the communicating groove and the corresponding slit groove along the d-axis direction.

[0007] In some embodiments, the total area of ​​the slits on the first rotor punching located on the inner peripheral side of the inner hole of the second rotor punching accounts for at least 20% of the total area of ​​the motor circulation holes; and / or, the total area of ​​the slits on the first rotor punching located within the inner hole of the second rotor punching accounts for at least 30% of the total area of ​​the slits.

[0008] In some embodiments, the total area of ​​the slit grooves on the first rotor punching located on the inner peripheral side of the inner hole of the second rotor punching accounts for 25% to 40% of the total area of ​​the motor circulation holes; and / or, the total area of ​​the slit grooves on the first rotor punching located within the inner hole of the second rotor punching accounts for 45% to 65% of the total area of ​​the slit grooves.

[0009] In some embodiments, a ratio of a maximum width of the inner hole of the second rotor punch along the q-axis to a maximum width along the d-axis is 1 to 1.5.

[0010] In some embodiments, the total area of ​​the communicating slots on the second rotor punching is less than or equal to the total area of ​​the filling slots on the first rotor punching.

[0011] In some embodiments, the connecting grooves provided on the second rotor punching are at the same position as the filling grooves provided on the first rotor punching, and the area of ​​a single connecting groove on the second rotor punching is no greater than the area of ​​a single filling groove on the first rotor punching at the same position.

[0012] In some embodiments, the radial width between the inner hole and the outer circle of the second rotor punching is unequal at different positions, and the radial width kd1 of the second rotor punching on the d-axis and the radial width kq1 on the q-axis satisfy 1.1≤kd1 / kq1≤2.8.

[0013] In some embodiments, 1.2≤kd1 / kq1≤1.8.

[0014] In some embodiments, the area of ​​the slits in each magnetic barrier layer on the first rotor punching sheet located within the inner hole of the second rotor punching sheet gradually decreases from the rotor shaft hole side to the rotor outer circle side.

[0015] In some embodiments, the maximum width of the outer contour of the end ring is no greater than the maximum width of the outer contour of the second rotor punching, and the maximum distance from the center of the rotor core to the end face of the end ring is no less than the maximum distance from the center of the rotor core to the end face of the second rotor punching; 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.

[0016] In some embodiments, 1.2≤k9 / k10≤1.8.

[0017] In some embodiments, there is a center point in the axial plane where the side of the dividing rib close to the outer circle of the rotor is located, and the distance between the two center points corresponding to the two dividing ribs in any two adjacent magnetic barrier layers along the d-axis direction is L. The maximum distance along the q-axis direction of the magnetic conductive channel formed between the filling slots in the two adjacent magnetic barrier layers is W, and 0≤L<2W.

[0018] In some embodiments, 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, and 0≤L<8σ.

[0019] In some embodiments, the width of the dividing rib in the inner magnetic barrier layer adjacent to the first filling slot in the d-axis direction is L1, the first rotor punching sheet has an axial hole, the width of the dividing rib in the inner magnetic barrier layer adjacent to the axial hole in the d-axis direction is L2, L1 is not less than L2, and L1 ≥ 0.5*σ.

[0020] In some embodiments, the d-axis and the q-axis divide the first rotor punching into four quadrants from the center of its axial hole. In the first quadrant, the minimum distance from the geometric center of the dividing rib to the d-axis is kd, and the minimum distance to the q-axis is kq, kq = -ν*kd+λ, where 0.28≤ν≤0.46, 28≤λ≤33.

[0021] In some embodiments, the width of the slit slot on the q axis decreases continuously in at least three layers in the direction away from the d axis; the width of the slit slot on the q axis is d2, the width of the first filling slot on the q axis is d1, the sum of the widths of all the slit slots and the first filling slot on the q axis is (d1+∑d2), the width from the wall of the shaft hole to the outer circle of the first rotor punching is d3, (d1+∑d2) / d3=0.2~0.5.

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

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

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

[0025] In some embodiments, a magnetic channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic channel on the q-axis gradually decreases in a direction away from the d-axis.

[0026] In some embodiments, the width of each magnetic flux conducting channel on the q-axis decreases at least three times in the direction away from the d-axis; and / or, the width of the magnetic flux conducting channel gradually increases from the q-axis to both sides of the q-axis for the magnetic flux conducting channel composed of an arc segment and a straight line segment.

[0027] In some embodiments, the ratio of the width of the slit groove on the q-axis to the width of the end of the slit groove close to 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.

[0028] In some embodiments, the ratio of the maximum width of the filling groove along the q-axis to the width of the slit groove on the q-axis in each magnetic barrier layer is τ2, and τ2>1.4.

[0029] In some embodiments, the width between the ends of the two second filling grooves close to the slit groove on the d-axis in the outer magnetic barrier layer close to the outer side of the rotor is k3; and the width between the ends of the two second filling grooves close to the slit groove on the d-axis in the inner magnetic barrier layer adjacent to the rotor shaft hole side is k4, 0.5≤k3 / k4≤1 or 0.5≤k4 / k3≤1.

[0030] In some embodiments, the width between the ends of the two second filling grooves close to the slit groove on the d-axis in the outermost slit groove close to the outer side of the rotor is k5; and the width between the ends of the two second filling grooves close to the slit groove on the d-axis in the innermost slit groove close to the rotor shaft hole side is k6, then 0.5≤k5 / k6≤1 or 0.5≤k6 / k5≤1.

[0031] In some embodiments, the first filling groove is located on the q-axis direction of the rotor outer periphery, composed of a plurality of q-axis filling grooves, and a rib exists between any two adjacent q-axis filling grooves, the number of ribs of the first filling groove is y, 1≤y≤4.

[0032] In some embodiments, the width of the rib between any two adjacent q-axis filling grooves along the d-axis is L3, L3>0.1M1, L3>0.1M2, L3>0.05(M1+M2), M1 and M2 are the maximum width of the rib along the d-axis of the two adjacent q-axis filling grooves.

[0033] In some embodiments, the sum of the width of the rib between any two adjacent q-axis filling grooves along the d-axis is ∑L3, ∑L3>0.1∑(M1+M2).

[0034] In some embodiments, the width difference between each slot is within ±20%, and the minimum value of each slot width L3 satisfies L3≥σ, where σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor.

[0035] In some embodiments, the filling area difference of each q-axis filling slot is within ±30%.

[0036] In some embodiments, the angle between the two ends of the first filling slot and the center line of the rotor is α1, and 20°≤α1≤60°; and / or, the number of the first filling slots is n, and n≥1; and / or, the parallel angle deviation between the length extension direction of the filling slot and the d-axis is not more than 5%.

[0037] In some embodiments, the width of the first filling slot along the d-axis direction is smaller than the width between the two end portions of the two second filling slots adjacent to the first filling slot along the d-axis direction.

[0038] In some embodiments, the ratio of the distance k12 from the inner side wall of the first filling slot to the center of the rotor along the q-axis direction to the rotor radius Rr satisfies 0.82≤k12 / Rr≤0.96.

[0039] In some embodiments, the ratio of the distance of the side edge of the two innermost magnetic barrier layers near the shaft hole side along the q-axis to the width of the shaft along the q-axis is greater than 1.2; and / or, the ratio of the diameter of the arc segment of the side edge of the innermost magnetic barrier layer near the shaft hole side to the width of the shaft along the q-axis is greater than 2.

[0040] In some embodiments, the maximum thickness of the first filling slot along the q-axis direction is k, the maximum thickness of the second filling slot in the magnetic barrier layer adjacent to the first filling slot along the q-axis direction is k1, and the minimum thickness of the magnetic flux conducting channel connected to the first filling slot along the q-axis direction is k2, then 1

[0041] In some embodiments, the minimum distance between the first filling slot and the outer circle of the first rotor punching sheet is h4, the minimum distance between the second filling slot of the innermost magnetic barrier layer near the shaft hole side and the outer circle of the first rotor punching sheet is h3, 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.

[0042] In some embodiments, the maximum width of the end portion of the filling slot near the outer circle side of the first rotor punching sheet along the q-axis direction is not greater than the maximum width of the end portion near the shaft hole along the q-axis direction.

[0043] In some embodiments, the deviation between the maximum width of the end portion of the filling slot near the outer circle side of the first rotor punching sheet along the q-axis direction and the maximum width of the end portion near the shaft hole along the q-axis direction is not more than 5%.

[0044] In some embodiments, the filling slots on the first rotor punching sheet include at least five filling slots with different filling areas; and / or the total filling area of ​​the first filling slot and the second filling slot accounts for 30% to 70% of the total area of ​​the first filling slot, the second filling slot and the slit slot.

[0045] In some embodiments, a ratio between a maximum width and a minimum width of the filled trench in the q-axis direction is τ, and 1≤τ≤2.

[0046] In some embodiments, as the direction approaches the d-axis, the maximum width of the second filling grooves in each inner magnetic barrier layer along the d-axis gradually increases.

[0047] In some embodiments, the maximum width of each second filling slot along the d-axis direction increases continuously for at least three layers toward the direction approaching the d-axis; and / or, the maximum width of each second filling slot along the d-axis direction decreases continuously from the second inner magnetic barrier layer close to the d-axis to the magnetic barrier layer close to the outer circle of the rotor toward the direction away from the d-axis.

[0048] In some embodiments, at least a portion of the slots are filled with a conductive but non-magnetic material, and short-circuited via end rings at both ends of the second rotor sheet to form a squirrel cage.

[0049] In some embodiments, the slit groove is composed of arc segments and / or straight line segments. From the shaft hole side to the outer circle side of the first rotor punching sheet, the curvature of the arc segment of the slit groove gradually increases, and the curvature of the outer circle of the slit groove in the same layer is greater than the curvature of the inner circle, and the arc segment protrudes toward the side away from the shaft hole; or, the two ends of the slit groove extend into straight line segments along the d-axis direction, and the two ends of some or all of the slit grooves 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.

[0050] In some embodiments, from the shaft hole side to the outer circle side of the first rotor punching sheet, the curve length between the ends of each layer of slit slots close to the two second filling slots gradually decreases, and the curve length decrease ratio of adjacent slit slots is 5% to 25%.

[0051] In some embodiments, the maximum width of the axial hole on the first rotor punching sheet in the q-axis direction is not greater than its maximum width in the d-axis direction; and / or the axial hole is composed of arc segments and / or straight line segments.

[0052] In some embodiments, a balancing block is installed on the end ring, and the balancing block is located on the side with a larger radial width between the inner hole and the outer circle of the end ring.

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

[0054] The application further provides a compressor comprising the self-starting synchronous reluctance motor.

[0055] The motor rotor, the self-starting synchronous reluctance motor and the compressor provided by the application can make enough area of the slit groove directly contact air to form a flow-through hole and increase heat dissipation of the rotor by limiting the size relationship of the inner hole of the second rotor lamination on the q-axis and the d-axis. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 A schematic view of a three-dimensional structure of the motor rotor of the embodiment of the application

[0057] Figure 2 A schematic view of a structure of the first rotor lamination of the motor rotor of the embodiment of the application (axial direction);

[0058] Figure 3 A schematic view of a structure of the second rotor lamination of the motor rotor of the embodiment of the application (axial direction);

[0059] Figure 4 A schematic view of a structure of the motor rotor of the embodiment of the application (axial direction);

[0060] Figure 5 A schematic view of a structure of the first rotor lamination of the motor rotor of another embodiment of the application (axial direction);

[0061] Figure 6 A schematic view of a structure of the second rotor lamination of the motor rotor of another embodiment of the application (axial direction);

[0062] Figure 7 A schematic view of a structure of the motor rotor of another embodiment of the application (axial direction);

[0063] Figure 8 Comparison of temperature rise, loss and efficiency of the motor adopting the technical solution of the application and the motor in the prior art.

[0064] The signs are represented as:

[0065] 2, second rotor lamination; 21, communication groove; 3, end ring; 4, first rotor lamination; 51, first filling groove; 511, q-axis filling groove; 52, second filling groove; 6, slit groove; 7, shaft hole; 8, division rib; 9, rib. DETAILED DESCRIPTION

[0066] For reference Figures 1 to 8As shown, according to an embodiment of the present invention, a motor rotor is provided, including a rotor core, the rotor core including a first rotor punching 4 and a second rotor punching 2, the first rotor punching 4 is provided with a filling groove and a slit slot 6, the filling groove includes a second filling groove 52 and a first filling groove 51, the first rotor punching 4 is provided with a plurality of magnetic barrier layers spaced along its q-axis, the multi-layer magnetic barrier layers include two outer magnetic barrier layers and a plurality of inner magnetic barrier layers 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 slot 6 and a second filling groove 52 at both ends of the slit slot 6, in the same layer of inner magnetic barrier layer, a dividing rib 8 is provided between the second filling groove 52 and the slit slot 6, the second rotor punching 2 is arranged between the end ring 3 and the first rotor punching 4, a connecting groove 21 is provided on the second rotor punching 2 corresponding to the filling groove, and the maximum width of the inner hole of the second rotor punching 2 on the q-axis is not less than the maximum width on the d-axis. In this technical solution, by limiting the size relationship of the inner hole of the second rotor punching 2 on the q-axis and the d-axis, a sufficient area of ​​the slit slot 6 can be directly exposed to the air, forming a flow hole and increasing the heat dissipation of the rotor. Preferably, the maximum width of the outer contour of the second rotor punching 2 is not greater than the outer diameter of the first rotor punching 4, so that a certain width of air gap is formed between it and the motor stator, which is conducive to heat dissipation. Figure 8 It can be seen that by adopting the technical solution of the present invention, the temperature rise of the motor is low, and the copper loss and aluminum loss can be further reduced, thereby improving the efficiency of the motor.

[0067] The axial thickness of the second rotor punching 2 is not less than the thickness of the single-piece first rotor punching 4 to ensure the mechanical strength of the rotor.

[0068] In some embodiments, the width along the d-axis direction between the inner hole of the second rotor punching 2 and the connecting groove 21 is greater than the width along the d-axis direction of the dividing rib 8 between the connecting groove 21 and the corresponding slit slot 6, so as to ensure that the slit slot 6 is not filled during the rotor manufacturing process.

[0069] In some embodiments, the total area of ​​the slit slots 6 on the first rotor punching 4 located on the inner peripheral side of the inner hole of the second rotor punching 2 accounts for at least 20% of the total area of ​​the motor circulation hole, and more preferably, 25% to 40%. The total area of ​​the slit slots 6 located within the inner hole of the second rotor punching 2 is limited to ensure that a sufficient area of ​​the slit slots 6 is in direct contact with the air, thereby further improving the heat dissipation of the rotor.

[0070] The total area of ​​the slit slots 6 on the first rotor punching 4 located within the inner hole of the second rotor punching 2 accounts for at least 30% of the total area of ​​the slit slots 6, preferably 45% to 65%, to ensure that a sufficient area of ​​the slit slots 6 is in direct contact with the air, forming flow holes and increasing the heat dissipation of the rotor.

[0071] In some embodiments, the ratio of the maximum width of the inner hole of the second rotor punch 2 along the q-axis to the maximum width along the d-axis is 1 to 1.5, so as to further ensure that the slit slot 6 has a sufficient area to directly contact the air.

[0072] In some embodiments, the total area of ​​the connecting grooves 21 on the second rotor punching 2 is less than or equal to the total area of ​​the filling grooves on the first rotor punching 4. The connecting grooves 21 on the second rotor punching 2 serve as the entrance for filling material into the filling grooves on the first rotor punching 4. The connecting grooves 21 are provided on the second rotor punching 2 to allow the filling material to enter the filling grooves on the first rotor punching. Ensuring that the total area of ​​the connecting grooves 21 on the second rotor punching 2 is no greater than the total area of ​​the filling grooves provided on the first rotor punching 4 can reduce the force-bearing area of ​​the non-filling groove portion of the first rotor punching during filling, thereby ensuring its mechanical strength during the filling process and reducing deformation.

[0073] In some embodiments, the connecting groove 21 provided on the second rotor punching 2 is located at the same position as the filling groove provided on the first rotor punching 4, and the area of ​​a single connecting groove 21 on the second rotor punching 2 is not larger than the area of ​​a single filling groove on the first rotor punching 4 at the same position, so as to reduce local deformation of the first rotor punching when filling the material.

[0074] In some embodiments, the radial width between the inner hole of the second rotor punching 2 and its outer circle (i.e., the distance between the two points where the line connecting the rotor center and the rotor outer circle intersects the inner hole and the outer circle of the second rotor punching) is not equal at different positions, and the radial width kd1 of the second rotor punching 2 on the d-axis and the radial width kq1 on the q-axis satisfy 1.1≤kd1 / kq1≤2.8, preferably, 1.2≤kd1 / kq1≤1.8, to ensure that a sufficient number of slit slots 6 on the first rotor punching are located within the inner hole of the second rotor punching.

[0075] In some embodiments, the area of ​​the slits 6 in each magnetic barrier layer on the first rotor sheet 4, located within the inner hole of the second rotor sheet 2, gradually decreases from the rotor shaft hole side to the rotor outer circumference side. In this case, the end ring has a certain thickness along the q-axis near the magnetic barrier layer on the rotor outer circumference side, which can ensure that the end ring has a certain volume, thereby improving the motor's starting ability.

[0076] 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 punching 2, 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 punching 2, and 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 punching 2, so as to ensure that the part of the first rotor punching located on the outer circle side of the rotor that is not covered by the second rotor punching 2 is subjected to force during filling material, thereby reducing local deformation; 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 punching 2, thereby ensuring that the rotor has an end ring of a certain volume, which helps to improve the starting ability of the motor.

[0077] The radial width between the inner hole and the outer circle of the end ring 3 is k9 in the d-axis direction and k10 in the q-axis direction, then 1.1≤k9 / k10≤2.8, preferably, 1.2≤k9 / k10≤1.8, the inner filling groove close to the shaft hole side has a larger width along the d-axis direction, in order to make the filling groove short-circuit itself, the radial width of the end ring in the d-axis direction is larger; in order to ensure the area of ​​the slit groove 6 directly contacting the air, the radial width of the end ring in the d-axis direction cannot be too large.

[0078] In some embodiments, the axial plane containing the side of the dividing rib 8 near the rotor outer circumference has a center point. 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 along the q-axis of the magnetic channels formed between the filling slots 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 rotor filling slots can, on the one hand, reduce the saturation of the magnetic channels between the filling slots, and on the other hand, stagger the relative positions of the magnetic channels and stator teeth. This helps reduce motor harmonics, torque ripple, harmonic losses, and improve motor efficiency and operational stability.

[0079] It should be noted that the aforementioned center point is the geometric center point of the axial plane where the side of the dividing rib 8 close to the outer circle of the rotor is located. As a specific implementation method, Figure 2 As shown, the aforementioned plane is a parallelogram plane extending along the axial direction of the first rotor punching 4. The geometric center point of this parallelogram plane, that is, the intersection of its diagonals, is projected in the axial direction of the first rotor punching 4, and is the midpoint of the side length of the dividing rib 8 close to the outer circle of the rotor.

[0080] In some embodiments, 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, and more preferably, 0 ≤ L ≤ 6σ. The dividing ribs 8 can enhance the mechanical strength of the rotor, reduce rotor deformation during manufacturing, and reduce process complexity. Limiting the relative distance between the dividing ribs 8 between each rotor filling slot and the slit slot 6 increases the pressure-bearing area between adjacent magnetic barrier layers, creating a mutual support effect, reducing rotor deformation during manufacturing, and reducing process complexity.

[0081] In some embodiments, the width of the dividing rib 8 in the inner magnetic barrier layer adjacent to the first filling slot 51 along the d-axis is L1. The first rotor punching has an axial hole 7. The width of the dividing rib 8 in the inner magnetic barrier layer adjacent to the axial hole 7 along the d-axis is L2. L1 is not less than L2, and L1 ≥ 0.5*σ. Limiting the minimum width of the dividing rib 8 can reduce machining difficulty and improve the mechanical strength of the rotor. When L1 ≥ L2, magnetic flux leakage from the inner magnetic barrier layer can be reduced, thereby improving motor efficiency.

[0082] In some embodiments, the plane where the side surface of the dividing rib 8 lies is parallel to or intersects with the plane where the q-axis lies, that is, the shape of the dividing rib 8 is not limited to being rectangular, trapezoidal, or arc-shaped.

[0083] In some embodiments, the d-axis and the q-axis divide the first rotor punching 4 into four quadrants from the center of the shaft hole 7. In the first quadrant (for example Figure 1 The minimum distance from the geometric center of the dividing rib 8 to the d-axis is kd, and the minimum distance to the q-axis is kq, kq = -ν*kd+λ, where 0.28≤ν≤0.46 (dimensionless), 28≤λ≤33 (dimension consistent with kq and kd), is used to limit the position and width of the dividing rib 8 and reduce the risk of rotor deformation.

[0084] In some embodiments, the width of the slit slot 6 on the q-axis decreases continuously in at least three layers in a direction away from the d-axis; the width of the slit slot 6 on the q-axis is d2, the width of the first filling slot 51 on the q-axis is d1, the sum of the widths of all the slit slots 6 and the first filling slot 51 on the q-axis is (d1+∑d2), the width from the hole wall of the shaft hole 7 to the outer circle of the first rotor punching is d3, (d1+∑d2) / d3=0.2-0.5, preferably, (d1+∑d2) / d3=0.3-0.4. A reasonable magnetic barrier ratio is selected to ensure both sufficient magnetic barrier width and a reasonable magnetic flux channel, thereby increasing the motor salient pole ratio while preventing magnetic circuit oversaturation.

[0085] 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, where d is the minimum width of the magnetic channel between the slit slots 6 in the two adjacent magnetic barrier layers. Preferably, W1 / d > 1.15. Sufficient width is ensured between the filling slots to avoid magnetic field saturation, which could affect the magnetic flux flow in the channel between the magnetic barrier layers.

[0086] In some embodiments, the minimum distance along the q-axis between two adjacent slit slots 6 in two adjacent magnetic barrier layers is h1, where h1 ≥ 1.5h2, where h2 is the minimum width of the magnetic barrier layer along the q-axis. This arrangement can reduce the difficulty of rotor manufacturing and ensure uniformity and unsaturation of the rotor's magnetic flux density distribution.

[0087] In some embodiments, 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. 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. This arrangement ensures the width of the magnetic channel close to the shaft hole on the basis of reasonable utilization of the rotor space, which helps to improve the performance of the motor. 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 (the width of the magnetic channel is defined as: the shortest distance from each point on one of the two sides of the magnetic channel to the other side). The width of the magnetic channel defined here is the width of the cross section through which the magnetic lines of force on the rotor pass. This arrangement helps to reduce the magnetic flux saturation of the rotor and reduce motor losses.

[0088] In some embodiments, in each magnetic barrier layer, the ratio of the width of the slit slot 6 along the q-axis to the width of the slit slot 6 near the end of the filling slot is τ1, and τ1 gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer. This ensures the width of the magnetic channel between the inner magnetic barrier layers while maintaining a certain proportion of the magnetic barrier layers, improving motor performance. In each magnetic barrier layer, the ratio of the maximum width of the filling slot along the q-axis to the width of the slit slot 6 along the q-axis is τ2, where τ2>1.4, preferably 1.5<τ2<3.0. Limiting the minimum value of this ratio ensures that the filling slot has a certain width to increase its layout area; limiting the range of this ratio can also ensure the width of the magnetic channel between the filling slots.

[0089] 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 slots 52 at either end of the slot 6, near the slot 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 slots 52 at either end of the slot 6, near the slot 6, is k4. Therefore, 0.5 ≤ k3 / k4 ≤ 1 or 0.5 ≤ k4 / k3 ≤ 1. Given limited rotor space, this arrangement can increase the area of ​​the filling slots and improve the motor's starting capability.

[0090] In some embodiments, in the outermost magnetic barrier layer near the rotor's outer circumference, the width along the d-axis between the ends of the two second filling slots 52 at either end of the slot 6, near the slot 6, is k5. In the innermost magnetic barrier layer near the rotor's shaft hole, the width along the d-axis between the ends of the two second filling slots 52 at either end of the slot 6, near the slot 6, is k6. Therefore, 0.5 ≤ k5 / k6 ≤ 1 or 0.5 ≤ k6 / k5 ≤ 1. Given limited rotor space, this arrangement can increase the area of ​​the filling slots and improve the motor's starting capability.

[0091] In some embodiments, the first filling slots 51 are located along the q-axis of the rotor's outer circumference and have a segmented structure, consisting of multiple q-axis filling slots 511. Ribs 9 are located between adjacent q-axis filling slots 511. The number of ribs 9 in each first filling slot 51 is y, where y satisfies 1≤y≤4. The outermost magnetic barrier layer, formed by the first filling slots 51 and located near the rotor's outer circumference, is the most susceptible to rotor deformation. Segmenting the outermost first filling slots 51 into multiple q-axis filling slots 511 can reduce rotor deformation in this area.

[0092] In some embodiments, the width of the rib 9 along the d-axis between any two adjacent q-axis filling slots 511 is L3. L3 satisfies the conditions L3 > 0.1M1, L3 > 0.1M2, and L3 > 0.05(M1 + M2), where M1 and M2 represent the maximum widths of any two adjacent q-axis filling slots 511 along the d-axis. Limiting the maximum width of the q-axis filling slots 511 along the d-axis can reduce the saturation of the channels between the rotor's outer magnetic barriers, helping to reduce motor harmonics, torque ripple, and harmonic losses, thereby improving motor efficiency and operational stability. Furthermore, limiting the width of the rib 9 between each q-axis filling slot 511 ensures the force-bearing area of ​​the rotor's outermost magnetic barrier, further enhancing the rotor's mechanical strength, reducing rotor deformation during manufacturing, and reducing manufacturing complexity.

[0093] In some embodiments, the sum of the widths of the ribs 9 between any two adjacent q-axis filling slots 511 in the direction of the d-axis is ∑L3 (each L3 is equal or not equal), and ∑L3 > 0.1∑(M1+M2), ∑(M1+M2) is the sum of the widths of each q-axis filling slot 511 in the direction of the d-axis. In this way, the mechanical strength of the rotor can be ensured in some embodiments.

[0094] In some embodiments, the width difference between each rib 9 is within ±20%, and the minimum value of the width of each rib 9 should satisfy L3≥σ, σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor, so as to reduce the local deformation of the rotor at the outermost magnetic barrier layer.

[0095] In some embodiments, the widths of different parts of the same rib in the direction of the d-axis are equal or not equal, i.e., the shape of the rib 9 is not limited to rectangular or trapezoidal or arc-shaped. The same rib 9 can be provided with a larger width in the direction of the d-axis at a position where the risk of local deformation is high, and a smaller width in the direction of the d-axis at a position where the risk of local deformation is low.

[0096] In some embodiments, the area difference of each q-axis filling slot 511 is within ±30%, and more preferably, the area difference of each q-axis filling slot 511 is within ±15%. In this way, the areas of the outermost magnetic barrier layer subjected to pressure are ensured to be not greatly different, thereby avoiding local deformation.

[0097] In some embodiments, the included angle α1 between the two ends of the first filling slot 51 and the center of the rotor should satisfy 20°≤α1≤60°, more preferably, α1 should satisfy 30°≤α1≤50°, and most preferably, α1 should satisfy 30°≤α1≤35°. In this way, the magnetic barrier layer formed as a filling slot can not only act as a magnetic barrier layer to increase the reluctance torque of the motor, but also act as a starting squirrel cage to improve the starting performance of the motor.

[0098] In some embodiments, the filling slots, including the first filling slot 51 and the second filling slot 52, extend approximately parallel to the d-axis with an angle deviation of not more than 5%, so as to form a smooth magnetic flux channel between adjacent magnetic barrier layers.

[0099] In some embodiments, the width of the first filling slot 51 in the direction of the d-axis is smaller than the width in the direction of the d-axis between the end portions of the two second filling slots 52 adjacent to the magnetic barrier layer and close to the slit slot 6. The purpose of this arrangement is to limit the width of the first filling slot 51 in the direction of the d-axis, so as to avoid deformation of the rotor towards the shaft hole side or the outer circle side due to excessive width.

[0100] In some embodiments, the ratio of the distance k12 from the first filling slot 51 to the rotor center along the q-axis to the rotor radius Rr satisfies 0.82 ≤ k12 / Rr ≤ 0.96. If k12 / Rr is too small, the outermost magnetic channel is too narrow, increasing motor losses and reducing efficiency. If k12 / Rr is too large, the distance between the first filling slot 51 and the rotor outer circumference is too small, increasing machining difficulty. The ratio of the distance between the sides of the two innermost magnetic barrier layers near the shaft hole on the q-axis to the width of the shaft along the q-axis is greater than 1.2. This ensures the width of the magnetic channel between the innermost magnetic barrier layers and the shaft, reducing rotor magnetic flux saturation, and 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 on the q-axis to the width of the shaft along the q-axis is greater than 2, effectively utilizing rotor space for the arrangement of the magnetic barrier layers.

[0101] In some embodiments, the maximum thickness of the first filling slot 51 along the q-axis is k, the maximum thickness of the second filling slot 52 in the adjacent magnetic barrier layer along the q-axis is k1, and the minimum thickness of the magnetic conductive channel connected thereto along the q-axis is k2. Thus, 1 < k / k1 ≤ 2, and 0.8 < k / k2 ≤ 1.6. This ensures both the thickness of the first filling slot 51 along the q-axis to reduce machining difficulty and the width of the outermost magnetic conductive channel to improve motor performance.

[0102] In some embodiments, the minimum spacing between the first filling slot 51 and the outer circumference of the first rotor sheet is h4, and the minimum spacing between the second filling slot 52 of the innermost magnetic barrier layer near the shaft hole and the outer circumference of the first rotor sheet is h3. h4 ≥ h3 and 0 ≤ h3 ≤ 2.5σ, where σ is the width of the air gap between the stator inner diameter and the rotor outer diameter. 0 ≤ h3 ≤ 2.5σ indicates that the filling slot is either an open slot or a closed slot. When the filling slot is a closed slot, the maximum spacing between it and the rotor outer circumference is limited to reduce magnetic flux leakage. h4 ≥ h3 can reduce magnetic flux leakage in the inner magnetic barrier layer while ensuring mechanical strength in the outer magnetic barrier layer.

[0103] In some embodiments, the maximum width of the filling slot along the q-axis at the end near the rotor's outer circumference is no greater than the maximum width of the filling slot along the q-axis at the end near the shaft hole. More preferably, the width of the filling slot along the q-axis is approximately equal from the rotor's outer circumference to the rotor's q-axis, with a width deviation of no more than 5%. This ensures a wide magnetic channel between the rotor's magnetic barriers near the air gap and reduces rotor saturation. Setting the filling slot widths along the q-axis to be approximately equal can increase the area of ​​the filling slot while ensuring a wide magnetic channel near the air gap, thereby improving starting.

[0104] In some embodiments, the rotor structure includes at least five filling slots of different areas. The total area of ​​the filling slots (first filling slot 51 and second filling slot 52) ​​should account for 30% to 70% of the total area of ​​the rotor slots (first filling slot 51, second filling slot 52, and slit slot 6), and more preferably, 35% to 50%. Ensuring a certain proportion of filling slot area ensures that the motor has a certain load starting capability.

[0105] In some embodiments, the ratio τ of the maximum to minimum thickness of all filling slots along the q-axis satisfies 1≤τ≤2; more preferably, 1.3≤τ≤1.5. Limiting this ratio prevents excessive thickness of the filling slots along the q-axis from reducing the width of the magnetic channel and thus affecting efficiency, while also preventing excessive thickness of the filling slots along the q-axis from reducing the area of ​​the filling slots and thus affecting starting.

[0106] In some embodiments, the width of each second filling slot 52 along the d-axis gradually increases as it approaches the d-axis. More preferably, the maximum width of each second filling slot 52 along the d-axis increases continuously for at least three layers as it approaches the d-axis. Most preferably, the maximum width of each second filling slot 52 along the d-axis continuously decreases as it moves away from the d-axis, from the second magnetic barrier layer near the d-axis to the magnetic barrier layer near the rotor's outer circumference. This arrangement ensures an appropriate amount of cast aluminum while utilizing rotor space, improving the motor's starting capability.

[0107] In some embodiments, at least a portion of the slots are filled with a conductive, non-magnetic material, and short-circuited by end rings 3 at both ends of the second rotor lamination 2 to form a cage. The end rings are made of the same material as the slots. The self-shorting cage structure provides asynchronous torque during motor startup, enabling self-starting of the motor. The multi-layered magnetic barrier structure provides reluctance torque to achieve synchronous operation.

[0108] In some embodiments, the slit slots 6 are composed of arc segments and / or straight segments. The arc segments of the slit slots 6 gradually increase in radius from the rotor shaft hole to the rotor outer circle. The outer arc of the slit slots 6 on the same layer is greater than the inner arc, and the arc segments protrude away from the shaft hole. Alternatively, the ends of the slit slots 6 extend into straight segments along the d-axis, with some or all of the ends of the slit slots 6 parallel to the d-axis. The width of the slit slots 6 gradually increases from the center of the slit slot 6 (q-axis) to the ends (d-axis). The axial hole 7 is opened in the middle of the rotor. This arrangement can improve the utilization of the rotor space and rationally arrange the slit slots 6 to increase the rotor salient pole ratio and enhance the motor's reluctance torque.

[0109] In some embodiments, the length of the curve between the ends of each layer of slit slots 6 near the two second filling slots 52 gradually decreases from the rotor shaft hole side to the rotor outer circle side, and the curve length of adjacent slit slots 6 decreases by 5% to 25%. This setting is intended to ensure a certain proportion of magnetic barrier layer while rationally utilizing rotor space, thereby improving motor performance.

[0110] In some embodiments, the maximum width of the shaft hole 7 in the q-axis direction is no greater than the maximum width of the shaft hole 7 in the d-axis direction. Slit slots 6 are provided in the q-axis direction. This arrangement can increase the utilization of the rotor space, allowing for the proper arrangement of the slit slots 6 to increase the rotor salient pole ratio and enhance the motor's reluctance torque.

[0111] In some embodiments, the axial hole 7 is composed of arc segments and / or straight line segments, that is, the shape of the axial hole 7 is not limited to a circle, an ellipse, an ellipse-like shape or a quadrilateral, and the shape of the axial hole 7 can be flexibly selected according to the arrangement of the slit groove 6.

[0112] It is understandable that the length, width, thickness, diameter, etc. of the rotor core-related structures in the present invention can preferably be measured in mm, and other appropriate measurement units can also be selected under reasonable circumstances.

[0113] The present invention provides a self-starting synchronous reluctance motor rotor, which realizes the self-starting of the motor through the asynchronous torque provided by the rotor bars (that is, the components formed after the filling slots are filled), solves the problem that the synchronous reluctance motor needs to be driven by a frequency converter, and at the same time reduces the loss of the motor and improves the efficiency of the motor; the motor rotor can reduce the harmonics of the motor, reduce torque pulsation, reduce harmonic losses, improve the efficiency and operating stability of the motor; and can increase the area of ​​the rotor directly contacting the air, form flow holes, and increase the heat dissipation of the rotor.

[0114] According to an embodiment of the present invention, a self-starting synchronous reluctance motor is also provided, in particular a self-starting synchronous reluctance two-pole motor, comprising the above-mentioned 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's own shaft system.

[0115] According to an embodiment of the present invention, a compressor is further provided, comprising the self-starting synchronous reluctance motor described above.

[0116] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0117] 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 shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A motor rotor, characterized in that: The invention comprises a rotor core, wherein the rotor core comprises a first rotor punching sheet (4) and a second rotor punching sheet (2), wherein a filling slot and a slit slot (6) are provided on the first rotor punching sheet (4), wherein the filling slot comprises a second filling slot (52) and a first filling slot (51), and wherein the first rotor punching sheet (4) is provided with a multi-layer magnetic barrier layer spaced along its q axis, wherein the multi-layer magnetic barrier layer comprises two outer magnetic barrier layers and a multi-layer inner magnetic barrier layer located between the two outer magnetic barrier layers, wherein the outer magnetic barrier layer comprises a first filling slot (51), and the inner magnetic barrier layer comprises a slit slot (6) and a second filling slot (52) located at both ends of the slit slot (6). In the same inner magnetic barrier layer, a dividing rib (8) is provided between the second filling groove (52) and the slit groove (6); the second rotor punching sheet (2) is provided between the end ring (3) and the first rotor punching sheet (4); a connecting groove (21) is provided on the second rotor punching sheet (2) corresponding to the filling groove; the maximum width of the inner hole of the second rotor punching sheet (2) on the q axis is not less than the maximum width on the d axis; the width between the inner hole of the second rotor punching sheet (2) and the connecting groove (21) along the d axis is greater than the width of the dividing rib (8) between the connecting groove (21) and the corresponding slit groove (6) along the d axis; The total area of ​​the slit slots (6) on the first rotor punching (4) located on the inner peripheral side of the inner hole of the second rotor punching (2) accounts for at least 20% of the total area of ​​the motor flow hole; and / or, the total area of ​​the slit slots (6) on the first rotor punching (4) located within the inner hole of the second rotor punching (2) accounts for at least 30% of the total area of ​​the slit slots (6); in the direction away from the d axis, the width of the slit slots (6) on the q axis continuously decreases in at least three layers; the width of the slit slots (6) on the q axis is d2, the width of the first filling slot (51) on the q axis is d1, and all the slit slots (6) and the first filling slot (51) are ) on the q-axis is (d1+∑d2), the width from the hole wall of the shaft hole (7) to the outer circle of the first rotor punching is d3, (d1+∑d2) / d3=0.2~0.5; the width along the d-axis direction between the ends of the two second filling grooves (52) at both ends of the outermost slit slot (6) close to the outer circle side of the rotor close to the slit slot (6) is k5; the width along the d-axis direction between the ends of the two second filling grooves (52) at both ends of the innermost slit slot (6) close to the rotor shaft hole side is k6, then 0.5≤k5 / k6≤1 or 0.5≤k6 / k5≤1.

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

3. The motor rotor according to claim 1, characterized in that: The total area of ​​the slit grooves (6) on the first rotor punching (4) located on the inner peripheral side of the inner hole of the second rotor punching (2) accounts for 25% to 40% of the total area of ​​the motor flow hole; and / or the total area of ​​the slit grooves (6) on the first rotor punching (4) located within the inner hole of the second rotor punching (2) accounts for 45% to 65% of the total area of ​​the slit grooves (6).

4. The motor rotor according to claim 1, characterized in that: The ratio of the maximum width of the inner hole of the second rotor punching (2) on the q-axis to the maximum width on the d-axis is 1 to 1.5; and / or the total area of ​​the connecting grooves (21) on the second rotor punching (2) is less than or equal to the total area of ​​the filling grooves on the first rotor punching (4).

5. The motor rotor according to claim 1, characterized in that: The communicating groove (21) provided on the second rotor punching (2) is located at the same position as the filling groove provided on the first rotor punching (4), and the area of ​​a single communicating groove (21) on the second rotor punching (2) is not greater than the area of ​​a single filling groove on the first rotor punching (4) at the same position; or, the radial width between the inner hole of the second rotor punching (2) and its outer circle is unequal at different positions, and the radial width kd1 of the second rotor punching (2) on the d-axis and the radial width kq1 on the q-axis satisfy 1.1≤kd1 / kq1≤2.

8.

6. The motor rotor according to claim 5, characterized in that: 1.2≤kd1 / kq1≤1.

8.

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

8. 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 punching (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 punching (2); and / or the radial width between the inner hole and the outer circle of the end ring (3) is k9 in the d-axis direction and k10 in the q-axis direction, then 1.1≤k9 / k10≤2.

8.

9. The motor rotor according to claim 8, characterized in that: 1.2≤k9 / k10≤1.

8.

10. The motor rotor according to claim 1, characterized in that: There is a center point in the axial plane where the side of the dividing rib (8) close to the outer circle of the rotor is located. 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 direction is L, and the maximum distance of the magnetic conductive channel formed between the filling slots in the two adjacent magnetic barrier layers along the q-axis direction is W, 0≤L<2W.

11. The motor rotor according to claim 10, characterized in that: 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.

12. The motor rotor according to claim 1, characterized in that: The width of the dividing rib (8) in the inner magnetic barrier layer adjacent to the first filling slot (51) in the d-axis direction is L1, the first rotor punching sheet has an axial hole (7), the width of the dividing rib (8) in the inner magnetic barrier layer adjacent to the axial hole (7) in the d-axis direction is L2, L1 is not less than L2, and L1 ≥ 0.5*σ.

13. The motor rotor according to claim 1, characterized in that: The d-axis and the q-axis divide the first rotor punching sheet (4) into four quadrants from the center of its shaft hole (7). In the first quadrant, the minimum distance from the geometric center of the dividing rib (8) to the d-axis is kd, and the minimum distance to the q-axis is kq, kq=-ν*kd+λ, where 0.28≤ν≤0.46, 28≤λ≤33.

14. 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, W1≥d, and d is the minimum width of the magnetic channel between the slit slots in the two adjacent magnetic barrier layers.

15. The motor rotor according to claim 14, characterized in that: W1 / d>1.

15.

16. The motor rotor according to claim 1, characterized in that The minimum distance of the magnetic channel between two adjacent slit slots (6) in two adjacent magnetic barrier layers along the q-axis direction is h1, h1≥1.5h2, h2 is the minimum width of the magnetic barrier layer along the q-axis direction that is smaller than the width of the slit slots (6) in the two adjacent magnetic barrier layers; or, a magnetic channel is formed between the 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.

17. The motor rotor according to claim 16, 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, and for a magnetic channel composed of arc segments and straight line segments, the width of the magnetic channel gradually increases from the q-axis to both sides of the q-axis.

18. 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) close to the end of the filling groove is τ1, and τ1 gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer.

19. 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 (6) on the q-axis is τ2, and τ2>1.

4.

20. The motor rotor according to claim 1, characterized in that In the outer magnetic barrier layer close to the outer circle side of the rotor, the width along the d-axis direction between the ends of the two second filling slots (52) located at both ends of the slit slot (6) close to the side of the slit slot (6) is k3; in the inner magnetic barrier layer adjacent to the shaft hole side, the width along the d-axis direction between the ends of the two second filling slots (52) located at both ends of the slit slot (6) close to the side of the slit slot (6) is k4, 0.5≤k3 / k4≤1 or 0.5≤k4 / k3≤1.

21. The motor rotor according to claim 1, characterized in that The first filling slot (51) is located in the q-axis direction of the outer circumference of the rotor and is composed of a plurality of q-axis filling slots (511). A rib (9) is present between two adjacent q-axis filling slots (511). The number of ribs (9) in the first filling slot (51) is y, and 1≤y≤4.

22. The motor rotor according to claim 21, characterized in that The width of the rib (9) along the d-axis direction between any two adjacent q-axis filling grooves (511) is L3, L3>0.1M1, L3>0.1M2, L3>0.05(M1+M2), and M1 and M2 are the maximum widths of the any two adjacent q-axis filling grooves (511) along the d-axis direction.

23. The motor rotor according to claim 22, characterized in that: The sum of the widths of the ribs (9) along the d-axis direction between any two adjacent q-axis filling grooves (511) is ∑L3, ∑L3>0.1∑(M1+M2).

24. The motor rotor according to claim 21, characterized in that The width difference between each rib (9) is within ±20%, and the minimum value L3 of the width of each rib (9) should satisfy L3 ≥ σ, where σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor; or, the filling area difference of each q-axis filling slot (511) is within ±30%.

25. The motor rotor according to claim 1, characterized in that The angle between the two ends of the first filling slot (51) and the line connecting the rotor center is α1, 20°≤α1≤60°; and / or the number of the first filling slots (51) is n, n≥1; and / or the angular deviation between the length extension direction of the filling slot and the parallelism of the d-axis does not exceed 5%.

26. The motor rotor according to claim 1, characterized in that The width of the first filling slot (51) along the d-axis direction is smaller than the width along the d-axis direction between the ends of two second filling slots (52) in the magnetic barrier layer adjacent to the first filling slot (51) on the side close to the slit slot (6); or, the ratio of the distance k12 from the inner side wall of the first filling slot (51) to the center of the rotor in the q-axis direction to the rotor radius Rr satisfies 0.82≤k12 / Rr≤0.

96.

27. The motor rotor according to claim 1, characterized in that The ratio of the distance between the side edges of the two innermost magnetic barrier layers close to the shaft hole on the q-axis and the width of the rotating shaft on the q-axis is greater than 1.2; and / or the ratio of the diameter of the arc segment of the side edge of the innermost magnetic barrier layer close to the shaft hole on the axial hole and the width of the rotating shaft on the q-axis is greater than 2.

28. The motor rotor according to claim 1, characterized in that The maximum thickness of the first filling groove (51) along the q-axis direction is k, the maximum thickness of the second filling groove (52) in the magnetic barrier layer adjacent to it along the q-axis direction is k1, and the minimum thickness of the magnetic conductive channel connected to it along the q-axis direction is k2, then 1<k / k1≤2, and / or, 0.8<k / k2≤1.

6.

29. The motor rotor according to claim 1, characterized in that The minimum spacing between the first filling slot (51) and the outer circle of the first rotor punching sheet is h4, and the minimum spacing between the second filling slot (52) of the innermost magnetic barrier layer close to the shaft hole side and the outer circle of the first rotor punching sheet is h3, h4≥h3 and 0≤h3≤2.5σ, σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor; or, the maximum width of the end of the filling slot close to the outer circle side of the first rotor punching sheet in the q-axis direction is not greater than the maximum width of the end of the filling slot close to the shaft hole (7) in the q-axis direction.

30. The motor rotor according to claim 29, characterized in that The deviation between the maximum width of the end portion of the filling groove close to the outer circumference side of the first rotor punching sheet in the q-axis direction and the maximum width of the end portion of the filling groove close to the shaft hole (7) in the q-axis direction is no more than 5%.

31. The motor rotor according to claim 1, characterized in that The filling slots on the first rotor punching sheet (4) include at least five filling slots with different filling areas; and / or the total filling area of ​​the first filling slot (51) and the second filling slot (52) accounts for 30% to 70% of the total area of ​​the first filling slot (51), the second filling slot (52) and the slit slot (6).

32. The motor rotor according to claim 1, characterized in that The ratio between the maximum width and the minimum width of the filling groove in the q-axis direction is τ, 1≤τ≤2; or, in the direction close to the d-axis, the maximum width of the second filling groove (52) in each inner magnetic barrier layer along the d-axis direction gradually increases.

33. The motor rotor according to claim 32, characterized in that In the direction approaching the d-axis, the maximum width of each second filling slot (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 second inner magnetic barrier layer close to the d-axis to the magnetic barrier layer close to the outer circumference of the rotor, the maximum width of each second filling slot (52) along the d-axis direction decreases continuously.

34. The motor rotor according to claim 1, characterized in that At least part of the filling slot is filled with a conductive but non-magnetic material, and a short circuit is achieved through the end rings (3) at both ends of the second rotor punching sheet (2) to form a squirrel cage.

35. The motor rotor according to claim 1, characterized in that The slit slot (6) is composed of arc segments and / or straight segments, and the curvature of the arc segments of the slit slot (6) gradually increases from the shaft hole side to the outer circle side of the first rotor punching sheet, and the curvature of the outer circle of the slit slots in the same layer is greater than the curvature of the inner circle, and the arc segments protrude toward the side away from the shaft hole; or, the two ends of the slit slot (6) extend into straight segments along the d-axis direction, and the two ends of some or all of the slit slots (6) are parallel to the d-axis, and the width of the slit slot (6) gradually increases from the middle position of the slit slot (6) to the two ends.

36. The motor rotor according to claim 1, characterized in that From the shaft hole side to the outer circle side of the first rotor punching sheet, the curve length between the ends of each layer of slit slots (6) close to the two second filling slots (52) gradually decreases, and the curve length decrease ratio of adjacent slit slots (6) is 5% to 25%.

37. The motor rotor according to claim 1, characterized in that The maximum width of the axial hole (7) on the first rotor punching sheet in the q-axis direction is not greater than its maximum width in the d-axis direction; and / or the axial hole (7) is composed of arc segments and / or straight line segments; or a balancing block is installed on the end ring (3), and the balancing block is located on the side with a larger radial width between the inner hole and the outer circle of the end ring (3).

38. A self-starting synchronous reluctance motor, characterized in that: A motor rotor comprising the motor rotor according to any one of claims 1 to 37.

39. A compressor, characterized in that: Including the self-starting synchronous reluctance motor as described in claim 38.

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