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 is characterized in that a filling groove and a slit groove are formed in a first rotor lamination, a plurality of magnetic barrier layers are arranged on the first rotor lamination along a q-axis of the first rotor lamination, the plurality of magnetic barrier layers comprise two outer magnetic barrier layers and a plurality of inner magnetic barrier layers arranged between the two outer magnetic barrier layers, the outer magnetic barrier layers comprise the first filling groove, the inner magnetic barrier layers comprise the slit groove and a second filling groove arranged at two ends of the slit groove, a second rotor lamination is arranged between an end ring and the first rotor lamination, a communication groove is arranged on the second rotor lamination corresponding to the filling groove, and a total area of the slit groove located between a hole in the second rotor lamination and an outer circle of the first rotor lamination is smaller than a total area of the slit groove on the first rotor lamination. According to the application, the structural design of the second rotor lamination can ensure that at least part of the slit groove directly contacts air to form a flow-through hole and increase rotor heat dissipation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of motor design, and particularly relates to a motor rotor, a self-starting synchronous reluctance motor and a compressor. BACKGROUND

[0002] The self-starting synchronous reluctance motor combines the advantages of the asynchronous motor on the basis of the synchronous reluctance motor, and realizes self-starting through the asynchronous torque generated by the rotor bar, without the need to use a frequency converter for driving. Compared with the asynchronous motor, the motor can realize constant-speed operation, has low rotor loss and improved efficiency during synchronous operation; compared with the asynchronous-start permanent magnet synchronous motor, the motor does not use permanent magnet material, has low cost and does not have the problem of permanent magnet demagnetization. However, due to the multiple magnetic barrier layers of the self-starting synchronous reluctance motor, the motor has the problem of poor heat dissipation. SUMMARY

[0003] Therefore, the present application provides a motor rotor, a self-starting synchronous reluctance motor and a compressor, which can overcome the problem of poor heat dissipation of the motor rotor of the self-starting synchronous reluctance motor in the related art.

[0004] In order to solve the above problems, the present application provides a motor rotor, characterized in that it comprises a rotor core, the rotor core comprises a first rotor lamination, the first rotor lamination is provided with a filling slot and a slit slot, the filling slot comprises a second filling slot and a first filling slot, the first rotor lamination is provided with multiple magnetic barrier layers which are spaced along the q-axis thereof, the multiple magnetic barrier layers comprise two outer magnetic barrier layers and multiple inner magnetic barrier layers which are located between the two outer magnetic barrier layers, the outer magnetic barrier layer comprises the first filling slot, the inner magnetic barrier layer comprises the slit slot and the second filling slot located at both ends of the slit slot, the second rotor lamination is arranged between the end ring and the first rotor lamination, the second rotor lamination is provided with a communication slot corresponding to the filling slot, and the total area of the slit slot of the first rotor lamination between the inner hole of the second rotor lamination and the outer circle is smaller than the total area of the slit slot of the first rotor lamination.

[0005] In some embodiments, the total area of the slit slot of the first rotor lamination within the inner hole of the second rotor lamination accounts for at least 30% of the total area of the rotor slit slot; and / or, the maximum width of the outer contour of the second rotor lamination is not greater than the diameter of the outer circle of the first rotor lamination; and / or, 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.

[0006] In some embodiments, among the lines connecting the points at different positions of the center of the rotor core and the inner hole of the second rotor lamination, the lengths of at least two lines are not equal.

[0007] In some embodiments, the ratio of the maximum width of the second rotor lamination inner hole on the q-axis to the maximum width on the d-axis is 1-1.5.

[0008] In some embodiments, the axial thickness of the second rotor lamination is not less than the thickness of the single-piece first rotor lamination.

[0009] In some embodiments, the total area of the communication grooves on the second rotor lamination is not greater than the total area of the filling grooves provided on the first rotor lamination.

[0010] In some embodiments, the communication grooves provided on the second rotor lamination are located at the same positions as the filling grooves provided on the first rotor lamination, and the area of a single communication groove on the second rotor lamination at the same position as a single filling groove on the first rotor lamination is not greater than the area of the single filling groove on the first rotor lamination.

[0011] In some embodiments, the width of the partition rib between the second rotor lamination inner hole and the communication groove in the d-axis direction is greater than the width of the partition rib between the communication groove and the slot groove.

[0012] In some embodiments, the radial width between the second rotor lamination inner hole and the outer circle is not equal at different positions, and the radial width kd1 of the second rotor lamination on the d-axis and the radial width kq1 of the second rotor lamination on the q-axis satisfy 1.1≤kd1 / kq1≤2.8.

[0013] In some embodiments, the total area of the slot grooves on the first rotor lamination that are located within the second rotor lamination inner hole accounts for at least 20% of the total area of the motor flow-through hole.

[0014] In some embodiments, from the rotor shaft hole side to the rotor outer circle side, the area of the slot grooves in each layer of magnetic barrier layers on the first rotor lamination that are located within the second rotor lamination inner hole gradually decreases.

[0015] In some embodiments, the maximum width of the outer contour of the end ring is not greater than the maximum width of the outer contour of the second rotor lamination, and the maximum distance from the center of the rotor core to the end face of the end ring is not less than the maximum distance from the center of the rotor core to the end face of the second rotor lamination.

[0016] In some embodiments, the radial width between the end ring inner hole and the outer circle is k9 on the d-axis and k10 on the q-axis, and 1.1≤k9 / k10≤2.8.

[0017] In some embodiments, the side of the partition rib near the rotor outer circle lies on an axial plane that has a center point, the distance between two center points corresponding to two partition ribs in any two adjacent layers of magnetic barrier layers along the d-axis direction is L, the maximum distance of the magnetic flux channel formed between the filling grooves in the two adjacent layers of magnetic barrier layers along the q-axis direction is W, and 0≤L<2W.

[0018] In some embodiments, the width of the air gap formed between the inner diameter of the stator and the outer diameter of the rotor is σ, and 0≤L<8σ.

[0019] In some embodiments, the width of the split ribs of the outermost layer of magnetic barrier layers near the outer circumferential side of the rotor along the d-axis direction is L1, the width of the split ribs of the innermost layer of magnetic barrier layers near the shaft hole side along the d-axis direction 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.

[0020] In some embodiments, in the first quadrant composed of the d-axis and the q-axis, the distance of the center of the split ribs relative to the d-axis and the q-axis satisfies kq=-ν*kd+λ, where kq is the distance of the center of the split ribs to the q-axis, kd is the distance of the center of the split ribs to the d-axis, 0.28≤ν≤0.46, and 28≤λ≤33.

[0021] In some embodiments, the width of the slit groove on the q-axis at least gradually decreases in three layers in the direction away from the d-axis.

[0022] In some embodiments, the minimum width W1 of the magnetic flux conducting channel between two adjacent filling grooves is W1≥d, where d is the minimum width of the magnetic flux conducting channel formed between the slit grooves corresponding to the two filling grooves.

[0023] In some embodiments, the minimum distance h1 of the magnetic flux conducting channel between two adjacent layers of magnetic barrier layers along the q-axis direction satisfies h1≥1.5h2, where h2 is the minimum width of the magnetic barrier layer with smaller width along the q-axis direction among the two adjacent layers of magnetic barrier layers.

[0024] In some embodiments, the magnetic flux conducting channels are formed between two adjacent layers of magnetic barrier layers, and the width of each magnetic flux conducting channel on the q-axis gradually decreases in the direction away from the d-axis.

[0025] In some embodiments, the width of each magnetic flux conducting channel on the q-axis at least gradually decreases in three layers in the direction away from the d-axis, and / or, for the magnetic flux conducting channel composed of an arc segment and a straight line segment, the width of the magnetic flux conducting channel gradually increases from the q-axis to both sides of the q-axis.

[0026] In some embodiments, in each layer of magnetic barrier layers, 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 is τ1, and τ1 gradually increases from the innermost layer of magnetic barrier layers to the outermost layer of magnetic barrier layers.

[0027] In some embodiments, in each layer of magnetic barrier layers, 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 is τ2, and τ2>1.4.

[0028] In some embodiments, in the outer layer of the magnetic barrier layer near the outer circumferential side of the rotor, the width between the ends of the two second filling slots near the slotted slot on the d-axis direction is k3; in the inner layer of the magnetic barrier layer near the shaft hole side adjacent to the above, the width between the ends of the two second filling slots near the slotted slot on the d-axis direction is k4, and 0.5≤k3 / k4≤1 or 0.5≤k4 / k3≤1.

[0029] In some embodiments, in the outermost layer of the magnetic barrier layer near the outer circumferential side of the rotor, the width between the ends of the two second filling slots near the slotted slot on the d-axis direction is k5; in the innermost layer of the magnetic barrier layer near the shaft hole side of the rotor, the width between the ends of the two second filling slots near the slotted slot on the d-axis direction is k6, and 0.5≤k5 / k6≤1 or 0.5≤k6 / k5≤1.

[0030] In some embodiments, the first filling slot is located on the q-axis direction of the outer periphery of the rotor, has a segmented structure, and is composed of a plurality of q-axis filling slots. There is a rib between any two adjacent q-axis filling slots.

[0031] In some embodiments, the number of ribs of the first filling slot is y, and y satisfies 1≤y≤4.

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

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

[0034] In some embodiments, the width difference between each rib is within ±20%, and the minimum value L3 of the width of each rib satisfies L3≥σ, and 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 area difference of each q-axis filling slot is within ±30%.

[0036] In some embodiments, the included angle α1 between the two ends of the first filling slot and the center line of the rotor is 20°≤α1≤60°.

[0037] In some embodiments, the parallel angle deviation between the length extension direction of the filling slot and the d-axis is not more than 5%.

[0038] In some embodiments, the first filling slot has a width along the d-axis that is smaller than a width along the d-axis between the ends of the two second filling slots in the magnetic barrier layer adjacent to the first filling slot on the side closer to the slot.

[0039] In some embodiments, a ratio of a distance k12 from the center of the rotor to the inner side wall of the first filling slot in the q-axis direction to the rotor radius Rr satisfies 0.82≤k12 / Rr≤0.96; and / or, a ratio of a distance on the q-axis of the side on the side closer to the shaft hole of the two innermost magnetic barrier layers on the side closer to the shaft hole to the width on the q-axis of the shaft satisfies greater than 1.2.

[0040] In some embodiments, a ratio of a diameter of the arc segment of the side on the side closer to the shaft hole of the innermost magnetic barrier layer on the side closer to the shaft hole to the width on the q-axis of the shaft satisfies greater than 2.

[0041] In some embodiments, the first filling slot has a maximum thickness along the q-axis direction of k, the second filling slot in the magnetic barrier layer adjacent to the first filling slot has a maximum thickness along the q-axis direction of k1, and the minimum thickness along the q-axis direction of the magnetic flux channel connected to the second filling slot is k2, then 1

[0042] In some embodiments, the maximum width along the q-axis direction of the end of the filling slot on the side closer to the rotor outer circle is not greater than the maximum width along the q-axis direction of the area of the filling slot at the rotor q-axis.

[0043] In some embodiments, the width deviation along the q-axis direction of the filling slot from the rotor outer circle to the rotor q-axis is not greater than 5%.

[0044] In some embodiments, the first rotor lamination has at least five kinds of 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 slot.

[0045] In some embodiments, a ratio τ of the maximum value and the minimum value of the thickness along the q-axis direction of all the filling slots satisfies 1≤τ≤2.

[0046] In some embodiments, 1.3≤τ≤1.5.

[0047] In some embodiments, the width along the d-axis direction of each second filling slot gradually increases in the direction closer to the d-axis.

[0048] In some embodiments, the maximum width of each second filling slot along the d-axis direction continuously increases by at least three layers towards the direction close to the d-axis.

[0049] In some embodiments, the maximum width of each second filling slot along the d-axis direction continuously decreases from the second layer of the magnetic barrier layer close to the d-axis to the magnetic barrier layer close to the outer side of the rotor towards the direction away from the d-axis.

[0050] In some embodiments, the slot of at least part of the first filling slot and the second filling slot is filled with electrically conductive and magnetically non-conductive material, the filling slots are self-short-circuit connected through the end ring at both ends of the second rotor punching sheet to form a squirrel cage structure.

[0051] In some embodiments, the slot is composed of an arc segment and / or a straight line segment, the arc segment of the slot gradually increases in curvature from the rotor shaft hole side to the outer side of the rotor, and the curvature of the outer circular arc of the slot in the same layer is greater than that of the inner circular arc, and the arc segment protrudes away from the shaft hole side; or, the two ends of the slot extend into a straight line segment along the d-axis direction, and the two ends of part or all of the slot are parallel to the d-axis, and the width of the slot gradually increases from the middle position of the slot to the two ends.

[0052] In some embodiments, the curve length between the end portions of each layer of the slot close to the two second filling slots gradually decreases from the rotor shaft hole side to the outer side of the rotor, and the curve length of the adjacent slot 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.

[0053] The application also provides a self-starting synchronous reluctance motor comprising the motor rotor.

[0054] The application also 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 ensure that at least part of the slot can directly contact air to form a flow-through hole and increase the heat dissipation of the rotor. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 FIG. 1 is a schematic diagram of the three-dimensional structure of the motor rotor of an embodiment of the application;

[0057] Figure 2 FIG. 2 is a schematic diagram of the structure of the first rotor punching sheet of the motor rotor of an embodiment of the application (axial direction);

[0058] Figure 3 FIG. 3 is a schematic diagram of the structure of the second rotor punching sheet of the motor rotor of an embodiment of the application (axial direction);

[0059] Figure 4Structure schematic view (axial direction) of electronic rotor of embodiment of the present application;

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

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

[0062] Figure 7 Structure schematic view (axial direction) of electronic rotor of another embodiment of the present application;

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

[0064] The signs represent:

[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 8 As shown, according to the embodiment of the present application, the present application provides a self-starting synchronous reluctance motor rotor, which can increase the area of rotor directly contacting air, form flow-through holes and increase rotor heat dissipation through special design of rotor core.

[0067] The specific implementation will be described below in combination with the rotor as an embodiment, Figure 1 Structure schematic view of motor rotor, which comprises rotor core, rotor core comprises first rotor lamination 4, second rotor lamination 2, end ring 3. Figure 2As shown in the first embodiment, the first rotor lamination 4 is provided with filling grooves, slot grooves 6, and shaft holes 7. The filling grooves include first filling grooves 51 and second filling grooves 52. 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. 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. Among the lines connecting the points of different positions of the rotor core center and the inner hole of the second rotor lamination 2, the lengths of at least two lines are not equal. The total area of the slot grooves 6 between the inner hole and the outer circle of the second rotor lamination 2 on the first rotor lamination 4 is less than the total area of the slot grooves 6 on the first rotor lamination 4. The second rotor lamination 2 is part of the rotor, and the outer contour thereof needs to be not greater than the outer circle of the first rotor lamination 4 to form an air gap with the stator with a certain width. The q-axis width of the inner contour of the second rotor lamination 2 corresponding to the slot grooves 6 of the first rotor lamination 4 needs to be not less than the d-axis width, so that enough area of the slot grooves 6 directly contacts air to form a flow-through hole and increase the heat dissipation of the rotor. Among the lines connecting the points of different positions of the rotor core center and the inner hole of the second rotor lamination 2, the lengths of at least two lines are not equal, which can limit the length of the line connecting the points of the rotor center and the inner hole of the second rotor lamination 2 on the q-axis direction to be longer, so that more slot grooves 6 are not shielded by the second rotor lamination 2. The total area of the slot grooves 6 between the inner hole and the outer circle of the second rotor lamination 2 on the first rotor lamination 4 is less than the total area of the slot grooves 6 on the first rotor lamination 4, that is, the second rotor lamination 2 cannot cover all the slot grooves 6. The structural design of the second rotor lamination can ensure that at least part of the slot grooves can directly contact air to form a flow-through hole and increase the heat dissipation of the rotor. Figure 8 As shown in the comparison of the temperature rise, loss, and efficiency of the motor of the present application and the prior art, it can be seen from the figure that the temperature rise of the motor is low, which can further reduce the copper loss and aluminum loss and improve the efficiency of the motor.

[0068] In some embodiments, the total area of the slot grooves 6 inside the inner hole of the second rotor lamination 2 on the first rotor lamination 4 accounts for at least 30% of the total area of the rotor slot grooves 6, and more preferably, the ratio is 45% to 65%. The total area of the slot grooves 6 inside the inner hole of the second rotor lamination 2 is limited to ensure that enough area of the slot grooves 6 directly contacts air to further improve the heat dissipation of the rotor.

[0069] In some embodiments, 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, to further ensure that enough area of the slot grooves 6 directly contacts air.

[0070] In some embodiments, the thickness of the second rotor lamination 2 in the stacking direction of the first rotor lamination 4 is not less than the thickness of a single first rotor lamination 4, to ensure the mechanical strength of the rotor.

[0071] In some embodiments, the second rotor lamination 2 is provided with a communication slot 21, and the total area of the communication slot 21 on the second rotor lamination 2 is not greater than the total area of the filling slot on the first rotor lamination 4. The communication slot 21 on the second rotor lamination 2 is an inlet for filling the filling slot on the first rotor lamination 4 with the filling material. The second rotor lamination 2 is provided with the communication slot 21 to enable the filling material to enter the filling slot on the first rotor lamination 4. The total area of the communication slot 21 on the second rotor lamination 2 is not greater than the total area of the filling slot on the first rotor lamination 4, which can reduce the stress area of the non-filling slot part of the first rotor lamination 4 during the filling of the filling material, ensure the mechanical strength of the first rotor lamination 4 during the filling of the filling material, and reduce the deformation amount.

[0072] In some embodiments, the communication slot 21 on the second rotor lamination 2 is provided at the same position as the filling slot on the first rotor lamination 4. The area of a single communication slot 21 on the second rotor lamination 2 is not greater than the area of a single filling slot on the first rotor lamination 4 at the same position, which can reduce the local deformation of the first rotor lamination 4 during the filling of the filling material.

[0073] In some embodiments, the width of the second rotor lamination 2 between the hole and the communication slot 21 along the d-axis direction is greater than the width of the partition rib 8 between the communication slot 21 and the slot 6, which can ensure that the slot 6 is not filled during the manufacturing process of the rotor.

[0074] In some embodiments, the radial width (i.e., the distance between the two points where the line connecting the center of the rotor and the outer circle of the rotor intersects with the hole and the outer circle of the second rotor lamination 2) between the hole and the outer circle of the second rotor lamination 2 is not equal at different positions, and the radial width kd1 of the second rotor lamination 2 along the d-axis and the radial width kq1 of the second rotor lamination 2 along the q-axis satisfy 1.1≤kd1 / kq1≤2.8, more preferably 1.2≤kd1 / kq1≤1.8, which can ensure that a sufficient number of slots 6 on the first rotor lamination 4 are located within the hole of the second rotor lamination 2.

[0075] In some embodiments, the total area of the slots 6 on the first rotor lamination 4 that are located within the hole of the second rotor lamination 2 accounts for at least 20% of the total area of the flow-through holes (stator flow-through holes and rotor flow-through holes) of the motor, more preferably, the ratio is 25% to 40%, which can ensure that a sufficient area of the slots 6 directly contacts air to form flow-through holes and increase the heat dissipation of the rotor.

[0076] In some embodiments, the area of the slots 6 on each layer of the magnetic barrier layer of the first rotor lamination 4 that are located within the hole of the second rotor lamination 2 gradually decreases from the side of the rotor shaft hole 7 to the side of the outer circle of the rotor. The end ring 3 has a certain thickness along the q-axis direction at the magnetic barrier layer close to the outer circle of the rotor, which can ensure that the end ring 3 has a certain volume to improve the starting ability of the motor.

[0077] In some embodiments, the maximum width of the outer profile of the end ring 3 is not greater than the maximum width of the outer profile 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 profile of the end ring 3 is not greater than the maximum width of the outer profile of the second rotor lamination 2 to ensure that the part of the first rotor lamination 4 located on the side of the rotor outer circle and not covered by the second rotor lamination 2 is less deformed when the filling material is stressed; the maximum distance from the center of the first rotor lamination 4 to the end face of the end ring 3 is not less than the maximum distance from the center of the first rotor lamination 4 to the end face of the second rotor lamination 2 to ensure that the rotor has a certain volume of the end ring 3, which helps to improve the starting ability of the motor.

[0078] 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, more preferably 1.2≤k9 / k10≤1.8. The width of the inner layer filling slot near the shaft hole 7 side is larger in the d-axis direction, in order to make the filling slot 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 slot 6 directly contacting the air, the radial width of the end ring 3 in the d-axis direction cannot be too large.

[0079] In some embodiments, in each layer of the magnetic barrier layer composed of the second filling slot 52 and the slit slot 6, there is a partition rib 8 between the second filling slot 52 and the slit slot 6. There is a center point on the axial plane where the side of the partition rib 8 near the rotor outer circle is located, the distance between the two center points corresponding to the two partition ribs 8 in any two adjacent layers of the magnetic barrier layer along the d-axis direction is L, and the maximum distance of the magnetic flux channel formed between the filling slots in the two adjacent layers of the magnetic barrier layer along the q-axis direction is W, then 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 slots can reduce the saturation degree of the magnetic flux channel between the filling slots, and can also stagger the relative position of the magnetic flux channel and the stator tooth, which helps to reduce the harmonics of the motor, reduce the torque ripple, reduce the harmonic loss, and improve the efficiency and stability of the motor.

[0080] It should be noted that the aforementioned center point is the geometric center point of the axial plane where the side of the partition rib 8 near the rotor outer circle is located, as a specific implementation, as shown in Figure 2 the aforementioned plane is a parallelogram plane extending along the axial direction of the first rotor lamination 4, and the geometric center point of the parallelogram plane, i.e. the intersection point of its diagonal, is the midpoint of the length of the side of the partition rib 8 near the rotor outer circle after projection in the axial direction of the first rotor lamination 4.

[0081] In some embodiments, the width of the air gap formed between the inner diameter of the stator and the outer diameter of the rotor is σ, and L should satisfy 0 < L < 8σ, more preferably, 0 ≤ L ≤ 6σ. The division ribs 8 can enhance the mechanical strength of the rotor, reduce the deformation of the rotor during the manufacturing process, and reduce the process difficulty. By limiting the relative distance of the division ribs 8 between the filling slots and the slit slots 6 of the rotor, the area of the two adjacent magnetic barrier layers that can withstand pressure can be increased, and the effect of mutual support can be formed, so that the deformation of the rotor during the manufacturing process is reduced, and the process difficulty is reduced.

[0082] In some embodiments, the width of the division rib 8 along the d-axis direction of the outermost magnetic barrier layer near the outer circular side of the rotor is L1, the width of the division rib 8 along the d-axis direction of the innermost magnetic barrier layer near the shaft hole 7 side is L2, L1 is not less than L2, and L1 ≥ 0.5*σ, σ is the width of the air gap between the stator and the rotor. Limiting the minimum width of the division rib 8 can reduce the processing difficulty and improve the mechanical strength of the rotor; L1 ≥ L2 can reduce the magnetic leakage of the inner magnetic barrier layer and improve the efficiency of the motor.

[0083] In some embodiments, the plane in which the side surface of the division rib 8 is located is parallel or intersects with the plane in which the q-axis is located, that is, the shape of the division rib 8 is not limited to be rectangular or trapezoidal or arc-shaped. The shape of the division rib 8 can be flexibly selected according to the direction of the magnetic leakage flux to reduce the magnetic leakage of the motor.

[0084] In some embodiments, in the first quadrant composed of the d-axis and the q-axis, the distance of the center of the division rib 8 relative to the d-axis and the q-axis satisfies kq = -ν*kd + λ, kq is the distance of the center of the division rib 8 to the q-axis, kd is the distance of the center of the division rib 8 to the d-axis, the coefficient ν satisfies 0.28 ≤ ν ≤ 0.46 (dimensionless), and the coefficient λ satisfies 28 ≤ λ ≤ 33 (consistent with the dimension of kq and kd), so as to limit the position and width of the division rib 8 and reduce the risk of deformation of the rotor.

[0085] In some embodiments, the width of the slit slot 6 on the q-axis direction away from the d-axis direction is at least 3 layers of continuous decrease; the ratio of the sum of the widths of all slit slots 6 and the first filling slot 51 along the q-axis direction (d1 + ∑d2) to the width d3 of the shaft hole 7 to the outer circumference of the rotor is 0.2-0.5, that is, (d1 + ∑d2) / d3 = 0.2-0.5, more preferably, the ratio is 0.3-0.4, wherein d1 is the width of the first filling slot 51 on the q-axis, and d2 is the width of the slit slot 6 on the q-axis. The purpose is to select a reasonable magnetic barrier ratio, which can ensure sufficient magnetic barrier width and reasonable magnetic flux channel, increase the saliency ratio of the motor, and prevent the magnetic circuit from being oversaturated.

[0086] In some embodiments, the minimum width W1 of the magnetic flux channel between two adjacent filling slots should satisfy W1≥d, where d is the minimum width of the magnetic flux channel formed between 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 between the magnetic barrier layers.

[0087] In some embodiments, the minimum distance h1 of the magnetic flux channel between two adjacent magnetic barrier layers in the q-axis direction should satisfy h1≥1.5h2, where h2 is the minimum width of the magnetic barrier layer with smaller width in the q-axis direction among the two adjacent magnetic barrier layers. This setting can reduce the difficulty of rotor processing and ensure the uniformity and unsaturation of the rotor magnetic density distribution.

[0088] In some embodiments, the magnetic flux channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic flux channel in the q-axis direction gradually decreases away from the d-axis; more preferably, the width of each magnetic flux channel in the q-axis direction decreases by at least 3 layers away from the d-axis. The closer the magnetic flux channel to the shaft hole 7, the greater the effect on the stator and the greater the impact on the motor performance. This setting ensures the width of the magnetic flux channel near the shaft hole 7 on the basis of reasonable utilization of the rotor space, which helps to improve the motor performance. For the magnetic flux channel composed of an arc segment and a straight line segment, the width of the magnetic flux channel gradually increases from the q-axis to both sides of the q-axis (the width of the magnetic flux channel is defined as the shortest distance from each point on one side of the magnetic flux channel to the other side). The width of the magnetic flux channel defined here is the cross-sectional width of the magnetic flux line passing through the rotor. This setting helps to reduce the saturation of the rotor magnetic density and reduce motor loss.

[0089] In some embodiments, in each magnetic barrier layer, the ratio of the width of the slot groove 6 in the q-axis direction to the width of the slot groove 6 near the end of the filling slot is τ1, which gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer. This ensures the width of the magnetic flux channel between the inner magnetic barrier layers and ensures a certain proportion of magnetic barrier layer occupancy to improve motor performance. In each magnetic barrier layer, the ratio of the maximum width of the filling slot in the q-axis direction to the width of the slot groove 6 in the q-axis direction is τ2, and τ2>1.4, preferably 1.5<τ2<3.0. Limiting this ratio ensures that the filling slot has a certain width to increase its arrangement area; limiting the range of this ratio can also ensure the width of the magnetic flux channel between the filling slots.

[0090] 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 7, 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.

[0091] 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 7, 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] In some embodiments, the widths of different parts of the same rib 9 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 part where the risk of local deformation is high, and a smaller width in the direction of the d-axis at a part where the risk of local deformation is low.

[0097] 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, so as to avoid local deformation.

[0098] 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.

[0099] In some embodiments, the filling slots, including the first filling slot 51 and the second filling slot 52, have an extension direction approximately parallel to the d-axis, and the angle deviation is not more than 5%. In this way, a smooth magnetic flux channel is formed between the adjacent magnetic barrier layers.

[0100] 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 of the side close to the slit slot 6 of the two second filling slots 52 in the adjacent magnetic barrier layer. In this way, the width of the first filling slot 51 in the direction of the d-axis is limited, so as to avoid deformation of the rotor towards the shaft hole 7 side or the outer circle side due to the excessively large width.

[0101] In some embodiments, the ratio of the distance k12 from the inner side wall of the first filling slot 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 flux channel is too narrow, the motor loss increases, and the efficiency decreases. If k12 / Rr is too large, the distance between the first filling slot 51 and the rotor outer circle is too small, and the processing difficulty increases. The ratio of the distance of the side of the two innermost magnetic barrier layers near the shaft hole 7 in the q-axis direction to the width of the shaft in the q-axis direction is greater than 1.2, which can ensure the width of the magnetic flux channel between the innermost magnetic barrier layer and the shaft, reduce the rotor magnetic density saturation, and enhance the mechanical strength of the rotor near the shaft.

[0102] In some embodiments, the maximum thickness of the first filling slot 51 in the q-axis direction is k, the maximum thickness of the second filling slot 52 in the q-axis direction in the magnetic barrier layer adjacent to the first filling slot 51 is k1, and the minimum thickness of the magnetic flux channel in the q-axis direction connected to the second filling slot 52 is k2. Then, 1

[0103] In some embodiments, the distance between the filling slot of the innermost magnetic barrier layer near the shaft hole 7 and the rotor outer circle is h3, and the distance between the outermost magnetic barrier layer near the rotor outer circle and the rotor outer circle is h4. Then, 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, i.e., the filling slot is an open slot or a closed slot. When the filling slot is a closed slot, the maximum distance between the filling slot and the rotor outer circle is limited, which can reduce the magnetic leakage. h4≥h3 can reduce the magnetic leakage of the inner magnetic barrier layer, while ensuring the mechanical strength of the outer magnetic barrier layer.

[0104] In some embodiments, the maximum width of the end of the filling slot near the rotor outer circle in the q-axis direction is not greater than the maximum width of the filling slot near the rotor q-axis in the q-axis direction. More preferably, the width of the filling slot in the q-axis direction is approximately equal from the rotor outer circle to the rotor q-axis, and the width deviation is not greater than 5%, which ensures the width of the magnetic flux channel between the rotor magnetic barrier layers near the air gap and reduces the rotor saturation. Setting the width of the filling slot in the q-axis direction to be approximately equal can increase the area of the filling slot while ensuring the width of the magnetic flux channel near the air gap, which helps to improve the starting.

[0105] In some embodiments, the motor rotor contains at least 5 or more filling slots with different areas; the total area of the filling slots (first filling slot 51, 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, slit slot 6), and more preferably, the ratio is 35% to 50%. Ensuring a certain proportion of filling slot area allows the motor to have a certain load starting ability.

[0106] In some embodiments, the ratio τ of the maximum and minimum values of the thickness of all filling slots in the q-axis direction satisfies 1≤τ≤2; more preferably 1.3≤τ≤1.5. Limiting this ratio, on the one hand, will not cause the magnetic flux channel width to be too small due to the filling slot thickness in the q-axis direction, thereby affecting the efficiency, on the other hand, will not cause the filling slot area to be too small due to the filling slot thickness in the q-axis direction, thereby affecting the starting.

[0107] In some embodiments, the width of each second filling slot 52 in the d-axis direction gradually increases in the direction close to the d-axis; more preferably, the maximum width of each second filling slot 52 in the d-axis direction increases by at least 3 layers continuously in the direction close to the d-axis; most preferably, the maximum width of each second filling slot 52 in the d-axis direction continuously decreases from the second layer of the magnetic barrier layer close to the d-axis to the magnetic barrier layer close to the outer side of the rotor. In this way, the space of the rotor can be reasonably utilized, the amount of cast aluminum with appropriate area can be ensured, and the starting ability of the motor can be improved.

[0108] In some embodiments, the filling slots include at least part of the filling slots of the first filling slot 51 and the second filling slot 52 filled with electrically conductive and magnetically non-conductive material, the filling slots are self-short-circuit connected through the end ring 3 at both ends of the second rotor lamination, forming a squirrel cage structure, and the material of the end ring 3 is the same as the filling material in the filling slot. The self-short-circuit squirrel cage structure provides asynchronous torque during the starting stage of the motor to achieve self-starting of the motor; the multi-layer magnetic barrier layer provides reluctance torque for the motor to achieve synchronous operation of the motor.

[0109] In some embodiments, the slit slot 6 is composed of an arc segment and / or a straight line segment, and the curvature of the arc segment of the slit slot 6 gradually increases from the rotor shaft hole 7 side to the rotor outer side, and the outer circular arc curvature of the same layer slit slot 6 is greater than the inner circular arc curvature, and the arc segment protrudes away from the shaft hole 7 side; or the ends of the slit slot 6 extend into straight line segments in the d-axis direction, and part or all of the ends of the slit slot 6 are parallel to the d-axis, and the width of the slit slot 6 gradually increases from the middle position (q-axis) of the slit slot 6 to both ends (d-axis). The rotor has a shaft hole 7 in the middle, and such a setting can increase the utilization rate of the rotor space, reasonably arrange the slit slot 6, increase the rotor salient pole ratio, and improve the reluctance torque of the motor.

[0110] In some embodiments, the curve length between the ends of each layer of slot 6 close to the two second filling slots 52 gradually decreases from the rotor shaft hole 7 side to the rotor outer circle side, and the curve length of adjacent slot 6 decreases by 5% to 25%.

[0111] 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. The slot 6 is arranged in the q-axis direction, which can increase the utilization rate of the rotor space, so as to reasonably arrange the slot 6 and increase the rotor salient pole ratio to improve the motor reluctance torque.

[0112] In some embodiments, the shaft hole 7 is composed of an arc segment and / or a straight line segment, that is, the shape of the shaft hole 7 is not limited to be circular or elliptical or oval or quadrilateral, and the shape of the shaft hole 7 can be flexibly selected according to the arrangement of the slot 6.

[0113] The balance block is installed on the end ring 3 at both ends of the rotor, and the balance block is placed on the side with a larger radial width between the inner hole and the outer circle of the end ring 3.

[0114] The application provides a self-starting synchronous reluctance motor rotor, which realizes self-starting of the motor through asynchronous torque provided by rotor bars (i.e. components formed after filling slots are filled), solves the problem that the synchronous reluctance motor needs a frequency converter for driving, 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 loss, improve the efficiency and operation stability of the motor; the area of the rotor directly contacting air can be increased to form a flow-through hole and increase heat dissipation of the rotor.

[0115] It can be understood that the length, width, thickness, diameter, etc. of the rotor core related structure in the application can be preferably measured in mm, and other appropriate measurement units can also be selected under reasonable conditions.

[0116] According to the embodiments of the application, a self-starting synchronous reluctance motor, in particular a self-starting synchronous reluctance two-pole motor, is also provided, which comprises the above motor rotor, and 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.

[0117] According to the embodiments of the application, a compressor comprising the above self-starting synchronous reluctance motor is also provided.

[0118] Those skilled in the art can understand that the above advantageous modes can be freely combined and superimposed without conflict.

[0119] The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

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), a filling slot and a slit slot (6) are provided on the first rotor punching sheet (4), the filling slot comprises a second filling slot (52) and a first filling slot (51), and the first rotor punching sheet (4) is provided with a plurality of magnetic barrier layers spaced along its q axis, the plurality of magnetic barrier layers comprises 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 comprises a first filling slot (51), 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 total area of ​​the slit groove (6) on the first rotor punching sheet (4) located between the inner hole and the outer circle of the second rotor punching sheet (2) is smaller than the total area of ​​the slit groove (6) on the first rotor punching sheet (4); the slit groove (6) on the first rotor punching sheet (4) located within the inner hole of the second rotor punching sheet (2) is smaller than the total area of ​​the slit groove (6) on the first rotor punching sheet (4). ) accounts for at least 30% of the total area of ​​the rotor slit slots (6); the total area of ​​the connecting grooves (21) on the second rotor punching (2) is not greater than the total area of ​​the filling grooves provided on the first rotor punching (4); and / or the connecting grooves (21) provided on the second rotor punching (2) and the filling grooves provided on the first rotor punching (4) are at the same position, and for filling grooves at the same position, the area of ​​a single connecting 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); the inner hole of the second rotor punching (2) and the connecting groove (21) are not greater than the inner hole of the second rotor punching (2) and the connecting groove (21) are not greater than the inner hole of the second rotor punching (2) and the connecting groove (21). The width along the d-axis direction between the connecting groove (21) and the slit slot (6) should be greater than the width of the dividing rib (8) between the connecting groove (21) and the slit slot (6); in the outermost 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 grooves (52) located at both ends of the slit slot (6) close to the slit slot (6) is k5; in the innermost magnetic barrier layer close to the rotor shaft hole (7), the width along the d-axis direction between the ends of the two second filling grooves (52) at both ends of the slit slot (6) close to the slit slot (6) 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 sheet (2) is not greater than the diameter of the outer circle of the first rotor punching sheet (4); and / or 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.

3. The motor rotor according to claim 1, characterized in that: Among the lines connecting the center of the rotor core and points at different positions of the inner hole of the second rotor punching sheet (2), at least two lines have unequal lengths.

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 1-1.5; 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).

5. The motor rotor according to claim 1, characterized in that: The radial width between the inner hole and the outer circle of the second rotor punching (2) 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 of the second rotor punching (2) on the q-axis satisfy 1.1≤kd1 / kq1≤2.

8.

6. 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 within 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, from the side of the rotor shaft hole (7) to the outer circle side of the rotor, the area of ​​the slit grooves (6) in each magnetic barrier layer on the first rotor punching (4) located within the inner hole of the second rotor punching (2) gradually decreases.

7. 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 on the d-axis and k10 on the q-axis, and 1.1≤k9 / k10≤2.

8.

8. 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, and 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; and or, 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.

9. The motor rotor according to claim 1, characterized in that: The width of the dividing rib (8) of the outermost magnetic barrier layer close to the outer circle of the rotor along the d-axis direction is L1, and the width of the dividing rib (8) of the innermost magnetic barrier layer close to the shaft hole (7) along the d-axis direction is L2, L1 is not less than L2, and L1 ≥ 0.5*σ, σ is the width of the air gap between the stator and the rotor; and / or, in the first quadrant formed by the d-axis and the q-axis, the distance between the center of the dividing rib (8) and the d-axis and the q-axis satisfies kq=-ν*kd+λ, 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.

10. The motor rotor according to claim 1, characterized in that: In the direction away from the d-axis, the width of the slit slot (6) on the q-axis decreases continuously in at least three layers; and / or, the minimum width W1 of the magnetic channel between two adjacent filling slots, W1 ≥ d, d being the minimum width of the magnetic channel formed between the slit slots (6) corresponding to the two filling slots.

11. 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 of the magnetic barrier layer with the smaller width along the q-axis among the two adjacent magnetic barrier layers; and / 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.

12. The motor rotor according to claim 11, 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 line segments, the width of the magnetic channel gradually increases from the q-axis to both sides of the q-axis.

13. 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 direction to the width of the slit groove (6) on the q-axis is τ2, and τ2>1.

4.

14. The motor rotor according to claim 1, characterized in that In the outer magnetic barrier layer close to the outer circumference 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 (7), 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, then 0.5≤k3 / k4≤1 or 0.5≤k4 / k3≤1.

15. The motor rotor according to claim 1, characterized in that: The first filling slot (51) is located in the q-axis direction of the rotor periphery, has a segmented structure, and is composed of a plurality of q-axis filling slots (511), with ribs (9) present between two adjacent q-axis filling slots (511).

16. The motor rotor according to claim 15, characterized in that: The number of ribs (9) of the first filling groove (51) is y, and y satisfies 1≤y≤4; and / or 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 any two adjacent q-axis filling grooves (511) along the d-axis direction.

17. The motor rotor according to claim 16, 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, then ∑L3>0.1∑(M1+M2), ∑(M1+M2) is the sum of the widths of each q-axis filling groove (511) along the d-axis direction.

18. The motor rotor according to claim 15, 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; and / or, the area difference of each q-axis filling slot (511) is within ±30%.

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

20. The motor rotor according to claim 1, characterized in that The width of the first filling groove (51) along the d-axis direction is smaller than the width along the d-axis direction between the ends of two second filling grooves (52) in the adjacent magnetic barrier layer close to the slit groove (6).

21. The motor rotor according to claim 1, characterized in that The ratio of the distance k12 from the inner side wall of the first filling groove (51) to the center of the rotor in the q-axis direction to the rotor radius Rr satisfies 0.82≤k12 / Rr≤0.96; and / or the ratio of the distance between the side edges of the two innermost magnetic barrier layers close to the shaft hole (7) on the q-axis and the width of the rotating shaft on the q-axis is greater than 1.

2.

22. The motor rotor according to claim 1, characterized in that The ratio of the diameter of the arc segment of the side of the innermost magnetic barrier layer close to the shaft hole (7) to the width of the rotating shaft on the q axis is greater than 2.

23. The motor rotor according to claim 1, characterized in that The maximum thickness of the first filling slot (51) along the q-axis direction is k, the maximum thickness of the second filling slot (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, 0.8<k / k2≤1.6; and / or, the spacing between the filling slot of the innermost magnetic barrier layer close to the shaft hole (7) and the outer circle of the rotor is h3, and the spacing between the outermost magnetic barrier layer close to the outer circle of the rotor and the outer circle of the rotor is h4, then 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.

24. The motor rotor according to claim 1, characterized in that The maximum width of the end portion of the filling groove close to the outer circumference of the rotor along the q-axis direction is not greater than the maximum width of the region of the filling groove close to the q-axis of the rotor along the q-axis direction.

25. The motor rotor according to claim 24, characterized in that: From the outer circle side of the rotor to the q-axis of the rotor, the width deviation of the filling groove along the q-axis direction is no more than 5%.

26. The electric 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).

27. The motor rotor according to claim 1, characterized in that The ratio τ of the maximum and minimum thicknesses of all filled grooves along the q-axis direction satisfies 1≤τ≤2.

28. The motor rotor according to claim 27, characterized in that 1.3≤τ≤1.

5.

29. The motor rotor according to claim 1, characterized in that As the width of each second filling groove (52) along the d-axis gradually increases in the direction approaching the d-axis.

30. The motor rotor according to claim 29, characterized in that Towards the direction approaching the d-axis, the maximum width of each second filling groove (52) along the d-axis direction increases continuously in at least three layers.

31. The motor rotor according to claim 30, characterized in that In a direction away from the d-axis, from the second 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 continuously decreases.

32. The motor rotor according to claim 1, characterized in that At least a portion of the first filling slot (51) and the second filling slot (52) is filled with conductive but non-magnetic material, and the filling slots are self-short-circuited via the end rings (3) at both ends of the second rotor punching sheet to form a squirrel cage structure.

33. The motor rotor according to claim 1, characterized in that The slit slot (6) is composed of arc segments and / or straight segments. From the side of the rotor shaft hole (7) to the outer circle side of the rotor, the curvature of the arc segment of the slit slot (6) gradually increases, and the curvature of the outer circle of the slit slot (6) on 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 (7); or, the two ends of the slit slot (6) extend into straight segments along the d-axis direction, and the two ends of part or all of the slit slot (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.

34. The motor rotor according to claim 1, characterized in that From the rotor shaft hole (7) side to the rotor outer circle side, 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 of adjacent slit slots (6) decreases at a ratio of 5% to 25%; and / or, 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.

35. A self-starting synchronous reluctance motor, characterized in that: A motor rotor comprising the motor rotor according to any one of claims 1 to 34.

36. A compressor, characterized in that Including the self-starting synchronous reluctance motor as described in claim 35.

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