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 slit groove, a second filling groove and a first filling groove are arranged on a first rotor lamination, 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 first filling groove comprises a plurality of q-axis filling grooves, a separation rib is arranged between two adjacent q-axis filling grooves, the width of the separation rib in the d-axis direction is L1, L1>0.1M1, L1>0.1M2, L1>0.05(M1+M2), wherein M1 and M2 are the maximum widths of the two adjacent q-axis filling grooves in the d-axis direction, respectively. According to the application, the motor harmonics can be reduced, the torque ripple can be reduced, the harmonic loss can be reduced, and the motor efficiency and operation stability can be improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of motor design, and particularly relates to a motor rotor and a self-starting synchronous reluctance motor and a compressor thereof. 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 bars, 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 has improved efficiency during synchronous operation. Compared with the asynchronous-starting permanent-magnet synchronous motor, the motor does not use permanent-magnet materials, has low cost, and does not have the problem of permanent-magnet demagnetization. However, due to the multi-layer magnetic barrier layer structure of the self-starting synchronous reluctance motor, the motor has the problem of large harmonics. SUMMARY

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

[0004] To solve the above problems, the present application provides a motor rotor, which comprises a rotor core, the rotor core comprising a first rotor lamination, the first rotor lamination being provided with a filling slot and a slit slot, the filling slot comprising a second filling slot and a first filling slot, the first rotor lamination being provided with a plurality of magnetic barrier layers along a q-axis thereof at intervals, the plurality of magnetic barrier layers comprising 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 comprising the first filling slot, the inner magnetic barrier layer comprising the slit slot and the second filling slot at both ends of the slit slot, the first filling slot comprising a plurality of q-axis filling slots, each two adjacent q-axis filling slots being provided with a partition rib, the width of each partition rib in a d-axis direction being L1, L1>0.1M1, L1>0.1M2, L1>0.05(M1+M2), wherein M1 and M2 are the maximum widths of the two adjacent q-axis filling slots in the d-axis direction, respectively.

[0005] In some embodiments, the sum of the widths of all the partition ribs in the d-axis direction is ∑L1, and ∑L1>∑0.1(M1+M2).

[0006] In some embodiments, the width difference of each partition rib is within ±20%; and / or, L1≥σ, σ being the width of the air gap formed between the rotor core and the corresponding stator core after the rotor core and the stator core are assembled.

[0007] In some embodiments, the number of partition ribs in the same first filling slot is y, 1≤y≤4, and y / Rr≥0.04, wherein Rr is the rotor radius.

[0008] In some embodiments, ∑L1 / Rr≥ 0.045.

[0009] In some embodiments, the filling area difference of each q-axis filling slot is within ±30%; and / or, each q-axis filling slot extends along a direction parallel to the d-axis.

[0010] In some embodiments, the filling area difference of each q-axis filling slot is within ±15%.

[0011] In some embodiments, the included angle between the two ends of the first filling slot and the center of the rotor is α1, 20°≤ α1≤ 60°; and / or, the number of q-axis filling slots in the first filling slot is n, 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%.

[0012] In some embodiments, the interval between the filling slot of the innermost magnetic barrier layer close to the shaft hole side and the outer circle of the rotor is h1, the interval between the outermost magnetic barrier layer close to the outer circle of the rotor and the outer circle of the rotor is h2, then h2≥ h1, and 0≤ h1≤ 2.5σ, σ is the width of the air gap formed between the first rotor lamination and the stator core after the rotor core and the corresponding stator core are assembled.

[0013] In some embodiments, there are at least five filling slots with different filling areas among the filling slots on the first rotor lamination; 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.

[0014] In some embodiments, the maximum width of the end of the filling slot close to the outer circle side of the first rotor lamination in the q-axis direction is not greater than the maximum width of the end close to the shaft hole in the q-axis direction.

[0015] In some embodiments, the deviation between the maximum width of the end of the filling slot close to the outer circle side of the first rotor lamination in the q-axis direction and the maximum width of the end close to the shaft hole in the q-axis direction is not greater than 5%.

[0016] In some embodiments, the ratio between the maximum width and the minimum width of the filling slot in the q-axis direction is τ, 1≤ τ≤ 2.

[0017] In some embodiments, 1.3≤ τ≤ 1.5.

[0018] In some embodiments, the maximum width of the second filling slot in the d-axis direction gradually increases in each inner magnetic barrier layer towards the direction close to the d-axis.

[0019] In some embodiments, the maximum width of each second filling slot along the d-axis direction continuously increases towards the direction close to the d-axis; and / or, 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 circle of the rotor.

[0020] In some embodiments, the slit slot is composed of an arc segment and / or a straight segment, and the curvature of the arc segment of the slit slot gradually increases from the shaft hole side to the outer circle side of the first rotor punching sheet, the curvature of the outer circle arc of the slit slot in the same layer is greater than the curvature of the inner circle arc, and the arc segment protrudes away from the shaft hole side; or, the two ends of the slit slot extend into straight segments along the d-axis direction, and the two ends of part or all of the slit slots are parallel to the d-axis, and the width of the slit slot gradually increases from the middle position of the slit slot to the two ends.

[0021] In some embodiments, the curve length between the ends of each layer of slit slots close to the two second filling slots gradually decreases from the shaft hole side to the outer circle side of the first rotor punching sheet, and the curve length of adjacent slit slots decreases by 5% to 25%.

[0022] In some embodiments, the width of the slit slot on the q-axis continuously decreases in the direction away from the d-axis for at least 3 layers; 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 slit slots and first filling slots on the q-axis is (d1+∑d2), the width from the hole wall of the shaft hole to the outer circle of the first rotor punching sheet is d3, and (d1+∑d2) / d3=0.2 to 0.5.

[0023] In some embodiments, the minimum width of the magnetic flux channel between the two adjacent filling slots in the adjacent two layers of magnetic barrier layers is W, and W≥d, where d is the minimum width of the magnetic flux channel between the slit slots in the adjacent two layers of magnetic barrier layers.

[0024] In some embodiments, W / d>1.15.

[0025] In some embodiments, the minimum distance of the magnetic flux channel between the two adjacent slit slots in the adjacent two layers of magnetic barrier layers along the q-axis direction is h3, and h3≥1.5h4, where h4 is the minimum width of the magnetic barrier layer with smaller width along the q-axis direction among the slit slots in the adjacent two layers of magnetic barrier layers.

[0026] In some embodiments, there is a spacing rib between the second filling slot and the slit slot in each inner magnetic barrier layer, and the spacing rib has a minimum width k11 in the d-axis direction, and k11≥0.5*σ, where σ is the width of the air gap formed between the rotor core and the stator core.

[0027] In some embodiments, the plane in which the side edges of the ribs close to the outer circumference of the rotor are located has a center point, the distance between the two center points corresponding to the rib of the outermost magnetic barrier layer close to the outer circumference of the rotor and the rib of the magnetic barrier layer adjacent thereto along the d-axis direction is k7; the distance between the two center points corresponding to the rib of the outermost magnetic barrier layer close to the outer circumference of the rotor and the rib of the innermost magnetic barrier layer close to the shaft hole of the rotor along the d-axis direction is k8, and 0≤k7 / k8≤0.6.

[0028] In some embodiments, the d-axis and the q-axis divide the center of the shaft hole of the first rotor lamination into four quadrants, in the first quadrant, the minimum distance from the geometric center of the division rib to the d-axis is kd, and the minimum distance to the q-axis is kq, kq=-v*kd+λ, where 0.28≤v≤0.46, 28≤λ≤33.

[0029] In some embodiments, the width of the first filling slot along the d-axis direction is smaller than the width along the d-axis direction between the ends of the two second filling slots in the magnetic barrier layer adjacent thereto close to the slit slot.

[0030] 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 in the q-axis direction to the rotor radius Rr satisfies 0.82≤K12 / Rr≤0.96.

[0031] In some embodiments, the distance between the side edges close to the shaft hole of the two innermost magnetic barrier layers close to the shaft hole in the q-axis direction is greater than 1.2 times the width of the shaft in the q-axis direction; and / or, the diameter of the arc segment of the side edge close to the shaft hole of the innermost magnetic barrier layer close to the shaft hole is greater than 2 times the width of the shaft in the q-axis direction.

[0032] 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 thereto along the q-axis direction is k1, and the minimum thickness of the magnetic flux channel connected thereto along the q-axis direction is k2, then 1

[0033] In some embodiments, the magnetic flux channel is formed between the two adjacent magnetic barrier layers, and the width of each magnetic flux channel in the q-axis direction gradually decreases in the direction away from the d-axis.

[0034] In some embodiments, the width of each magnetic flux channel in the q-axis direction decreases continuously for at least three layers in the direction away from the d-axis; and / or, the magnetic flux channel is formed between the two adjacent magnetic barrier layers, and the width of the magnetic flux channel gradually increases from the q-axis to both sides of the q-axis for the magnetic flux channel composed of an arc segment and a straight line segment.

[0035] In some embodiments, in each layer of the magnetic barrier layer, the ratio of the width of the slit groove in the q-axis direction 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 the magnetic barrier layer to the outermost layer of the magnetic barrier layer.

[0036] In some embodiments, in each layer of the magnetic barrier layer, the ratio of the maximum width of the filling groove in the q-axis direction to the width of the slit groove in the q-axis direction is τ2, and τ2>1.4.

[0037] In some embodiments, in the outer layer of the magnetic barrier layer near the outer side of the rotor, the width between the ends of the two second filling grooves near the slit groove in the d-axis direction is k3; and in the inner layer of the magnetic barrier layer adjacent to the second layer and near the shaft hole side, the width between the ends of the two second filling grooves near the slit groove in the d-axis direction is k4, and 0.5≤k3 / k4≤1 or 0.5≤k4 / k3≤1.

[0038] In some embodiments, the width between the ends of the two second filling grooves near the slit groove in the d-axis direction is k5 for the outermost layer of the magnetic barrier layer near the outer side of the rotor; and the width between the ends of the two second filling grooves near the slit groove in the d-axis direction is k6 for the innermost layer of the magnetic barrier layer near the shaft hole side of the rotor, and 0.5≤k5 / k6≤1 or 0.5≤k6 / k5≤1.

[0039] In some embodiments, the maximum width of the shaft hole on the first rotor lamination in the q-axis direction is not greater than the maximum width in the d-axis direction; and / or, the shaft hole is composed of an arc segment and / or a straight line segment.

[0040] In some embodiments, the rotor core further comprises a second rotor lamination, the second rotor lamination is arranged between the end ring and the first rotor lamination, and a communication groove is arranged on the second rotor lamination corresponding to the filling groove.

[0041] In some embodiments, the maximum width of the outer contour of the second rotor lamination is not greater than the outer diameter of the first rotor lamination, the maximum width of the inner hole of the second rotor lamination in the q-axis direction is not less than the maximum width in the d-axis direction; and / or, the axial thickness of the second rotor lamination is not less than the thickness of the single first rotor lamination.

[0042] In some embodiments, the ratio of the maximum width of the inner hole of the second rotor lamination in the q-axis direction to the maximum width in the d-axis direction is 1-1.5.

[0043] In some embodiments, the radial width between the inner hole of the second rotor lamination and the outer circle thereof is the smallest in the q-axis direction, and the radial width kd1 of the second rotor lamination in the d-axis direction and the radial width kq1 thereof in the q-axis direction satisfy 1.1≤kd1 / kq1≤2.8.

[0044] In some embodiments, 1.2≤kd1 / kq1≤1.8.

[0045] In some embodiments, the total area of the communication slots on the second rotor sheet is less than or equal to the total area of the filling slots on the first rotor sheet.

[0046] In some embodiments, the communication slots on the second rotor sheet are arranged at the same positions as the filling slots on the first rotor sheet, and the area of a single communication slot on the second rotor sheet at the same position is not greater than the area of a single filling slot on the first rotor sheet at the same position.

[0047] In some embodiments, the width of the second rotor sheet between the inner hole and the communication slot in the d-axis direction is greater than the width of the spacer between the communication slot and the corresponding slot in the d-axis direction.

[0048] In some embodiments, the total area of the slot on the first rotor sheet on the inner circumferential side of the inner hole of the second rotor sheet accounts for at least 20% of the total area of the motor flow-through hole; and / or, the total area of the slot on the first rotor sheet inside the inner hole of the second rotor sheet accounts for at least 30% of the total area of the slot.

[0049] In some embodiments, the total area of the slot on the first rotor sheet on the inner circumferential side of the inner hole of the second rotor sheet accounts for 25% to 40% of the total area of the motor flow-through hole; and / or, the total area of the slot on the first rotor sheet inside the inner hole of the second rotor sheet accounts for 45% to 65% of the total area of the slot.

[0050] In some embodiments, from the rotor shaft hole side to the rotor outer circle side, the area of the slot in each layer of the magnetic barrier layer on the first rotor sheet on the inner circumferential side of the inner hole of the second rotor sheet gradually decreases.

[0051] 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 sheet, 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 sheet; 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.

[0052] In some embodiments, 1.2≤k9 / k10≤1.8.

[0053] In some embodiments, at least part of the filling slots are filled with electrically conductive and magnetically non-conductive material, and a short circuit is achieved through the end rings at both ends of the first rotor sheet to form a squirrel cage.

[0054] The application also provides a self-starting synchronous reluctance motor comprising the above motor rotor.

[0055] The application further provides a compressor comprising the self-starting synchronous reluctance motor.

[0056] The motor rotor, the self-starting synchronous reluctance motor and the compressor provided by the application can reduce the deformation of the rotor at the outermost first filling slot, limit the maximum width of the q-axis filling slot along the d-axis direction, reduce the saturation degree of the channel between the outer magnetic barrier layers of the rotor, help to reduce the motor harmonics, reduce the torque ripple, reduce the harmonic loss, improve the motor efficiency and the stability of operation. BRIEF DESCRIPTION OF DRAWINGS

[0057] Figure 1 FIG. 1 is a structural schematic diagram (axial view) of a first rotor lamination of a motor rotor according to an embodiment of the application;

[0058] Figure 2 FIG. 2 is a structural schematic diagram (axial view) of a second rotor lamination of a motor rotor according to an embodiment of the application;

[0059] Figure 3 FIG. 3 is a structural schematic diagram (axial view) of an electronic rotor according to an embodiment of the application;

[0060] Figure 4 FIG. 4 is a structural schematic diagram (axial view) of a first rotor lamination of a motor rotor according to another embodiment of the application;

[0061] Figure 5 FIG. 5 is a comparison of current waveforms of a motor according to the technical solution of the application and a motor in the prior art;

[0062] Figure 6 FIG. 6 is a comparison of harmonics of a motor according to the technical solution of the application and a motor in the prior art;

[0063] Figure 7 FIG. 7 is a comparison of harmonic loss of a motor according to the technical solution of the application and a motor in the prior art;

[0064] Figure 8 FIG. 8 is a comparison of efficiency of a motor according to the technical solution of the application and a motor in the prior art;

[0065] Figure 9 FIG. 9 is a three-dimensional structural schematic diagram of a motor rotor according to an embodiment of the application.

[0066] The reference signs are as follows:

[0067] 1, first rotor lamination; 2, slit slot; 3, filling slot; 31, first filling slot; 311, q-axis filling slot; 32, second filling slot; 4, shaft hole; 5, division rib; 10, second rotor lamination; 11, communication slot; 12, end ring. DETAILED DESCRIPTION

[0068] For a better understanding of the present application, reference will be made to the following Figures 1 to 9 As shown in the drawings, according to the embodiments of the present application, a motor rotor is provided, comprising a rotor core, the rotor core comprising a first rotor lamination, the first rotor lamination being provided with a filling slot and a slit slot 2, the filling slot comprising a second filling slot 32 and a first filling slot 31, the first rotor lamination being provided with a plurality of layers of magnetic barrier layers spaced along the q-axis thereof, the plurality of layers of magnetic barrier layers comprising two outer magnetic barrier layers and a plurality of inner magnetic barrier layers between the two outer magnetic barrier layers, the outer magnetic barrier layers comprising the first filling slot 31, the inner magnetic barrier layers comprising the slit slot 2 and the second filling slot 32 at both ends of the slit slot 2, the first filling slot 31 comprising a plurality of q-axis filling slots 311, each two adjacent q-axis filling slots 311 being provided with a partition rib 5, so as to form a segmented structure of the first filling slot 31, the width of the partition rib 5 in the d-axis direction being L1, L1>0.1M1, L1>0.1M2, L1>0.05(M1+M2), wherein M1 and M2 are the maximum widths of the adjacent two q-axis filling slots 311 in the d-axis direction. In this technical solution, the outermost magnetic barrier layer composed of the first filling slot 31 near the outer circular side of the rotor is the most easily deformed part of the rotor, and the segmentation of the outermost first filling slot into a plurality of q-axis filling slots 311 can reduce the deformation of the rotor at this position, limiting the maximum width of the q-axis filling slot 311 in the d-axis direction can reduce the saturation degree of the channel between the outer magnetic barrier layers of the rotor, which helps to reduce the motor harmonics, reduce the torque ripple, reduce the harmonic loss, improve the efficiency and stability of the motor, and the like. Figures 5 to 8 As shown in the drawings, the present application is compared with the prior art, and Figure 5 As can be seen, compared with the prior art, the current waveform under the present application is closer to a sine wave; and Figure 6 As can be seen, the current harmonic content under the present application is greatly reduced; and Figure 7 As can be seen, under the present application, the harmonic loss of the motor is reduced; and Figure 8 As can be seen, under the present application, the efficiency of the motor is improved at different torque points. In addition, limiting the width of the partition rib between each q-axis filling slot 311 can ensure the stress area of the outermost magnetic barrier layer of the rotor, further enhancing the mechanical strength of the rotor, reducing the deformation of the rotor during the manufacturing process, and reducing the process difficulty.

[0069] In some embodiments, the sum of the widths of each partition rib 5 in the d-axis direction is ∑L1, ∑L1>∑0.1(M1+M2), which can further ensure the mechanical strength of the rotor.

[0070] In some embodiments, the width difference of each partition rib 5 is within ±20%; and / or, L1≥σ, σ being the width of the air gap formed between the rotor core and the corresponding stator core after assembly, so as to reduce the local deformation of the outermost magnetic barrier layer of the rotor.

[0071] In some embodiments, the number of division ribs 5 in the same first filling slot 31 is y, 1≤y≤4, and y / Rr≥0.04, where Rr is the rotor radius, i.e. the larger the rotor radius, the more the number of division ribs, to reduce the deformation of the rotor. In some embodiments, ∑L1 / Rr≥0.045, limiting the minimum value of the ratio of the total width of the division ribs 5 and the rotor radius, which can reduce the local deformation of the rotor.

[0072] In some embodiments, the widths of different parts of the same division rib 5 along the d-axis direction are equal or unequal, i.e. the shape of the division rib 5 is not limited to be rectangular or trapezoidal or arc-shaped. The same division rib 5 can be provided with a larger width along the d-axis direction at a part where the risk of local deformation is large, and a smaller width along the d-axis direction at a part where the risk of local deformation is small.

[0073] In some embodiments, the filling area difference of each q-axis filling slot 311 is within ±30%, preferably, the filling area difference of each q-axis filling slot 311 is within ±15%, which is set to ensure that the areas of the outermost magnetic barrier layer subjected to pressure are not greatly different, avoiding local deformation.

[0074] Each q-axis filling slot 311 extends in a direction parallel to the d-axis to form a smooth magnetic flux channel between adjacent magnetic barrier layers.

[0075] In some embodiments, the included angle between the two ends of the first filling slot 31 and the center line of the rotor is α1, 20°≤α1≤60°, preferably, 30°≤α1≤50°, most preferably, 30°≤α1≤35°, which is set to form a magnetic barrier layer and a filling slot, which can be used as a magnetic barrier layer to increase the reluctance torque of the motor, and also as a starting squirrel cage to improve the starting performance of the motor.

[0076] The number of q-axis filling slots 311 in the first filling slot 31 is n, n>1, which does not limit the number of blocks of the first filling slot 31, and can be flexibly selected according to the strength of the rotor and the size of the rotor leakage, if the rotor leakage is required to be small, the value of n is small; if the strength of the rotor is required to be large, the value of n is large.

[0077] The parallel angle deviation between the length extension direction of the filling slot and the d-axis is not more than 5%, i.e. the extension direction of the filling slot is approximately parallel to the d-axis, so that the d-axis magnetic force line of the rotor flows smoothly, and the q-axis magnetic force line is reduced as much as possible, the saliency of the motor is increased, and the output and efficiency of the motor are improved.

[0078] In some embodiments, the gap between the filling slot of the innermost magnetic barrier layer near the shaft hole side and the rotor outer circle is h1, the gap between the outermost magnetic barrier layer near the rotor outer circle side and the rotor outer circle is h2, then h2≥h1, and 0≤h1≤2.5σ, where σ is the width of the air gap between the rotor core and the corresponding stator core after the rotor core and the stator core are assembled. 0≤h1≤2.5σ, that is, the filling slot is an open slot or a closed slot, and when the filling slot is a closed slot, the maximum gap between the filling slot and the rotor outer circle is limited, which can reduce the magnetic leakage; h2≥h1 can reduce the magnetic leakage of the inner magnetic barrier layer while ensuring the mechanical strength of the outer magnetic barrier layer.

[0079] In some embodiments, there are at least five filling slots with different filling areas on the first rotor lamination 1; and / or, the total filling area of the first filling slot 31 and the second filling slot 32 accounts for 30% to 70% of the total area of the first filling slot 31, the second filling slot 32 and the slot 2, 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.

[0080] In some embodiments, the maximum width of the end of the filling slot near the outer circle side of the first rotor lamination in the q-axis direction is not greater than the maximum width of the end near the shaft hole 4 in the q-axis direction. More preferably, the deviation between the maximum width of the end of the filling slot near the outer circle side of the first rotor lamination in the q-axis direction and the maximum width of the end near the shaft hole 4 in the q-axis direction is not greater than 5%. Ensuring the width of the magnetic flux path between the rotor magnetic barrier layers near the air gap reduces the rotor saturation. Setting the width of the filling slot in the q-axis direction to be approximately equal (i.e., the deviation is not greater than 5%) can increase the area of the filling slot while ensuring the width of the magnetic flux path near the air gap, which helps to improve the starting.

[0081] In some embodiments, the ratio between the maximum width and the minimum width of the filling slot in the q-axis direction is τ, 1≤τ≤2, and more preferably, 1.3≤τ≤1.5. Limiting this ratio, on the one hand, the magnetic flux path width will not be too small due to the too large thickness of the filling slot in the q-axis direction, which will affect the efficiency, and on the other hand, the area of the filling slot will not be too small due to the too small thickness of the filling slot in the q-axis direction, which will affect the starting.

[0082] In some embodiments, the maximum width of the second filling slot 32 in each inner magnetic barrier layer along the d-axis direction gradually increases towards the direction close to the d-axis, preferably, the maximum width of the second filling slot 32 along the d-axis direction at least continuously increases by 3 layers towards the direction close to the d-axis, more preferably, the maximum width of the second filling slot 32 along the d-axis direction continuously decreases from the second layer of the inner magnetic barrier layer close to the d-axis to the magnetic barrier layer close to the outer circle of the rotor. In this way, the cast aluminum amount of the appropriate area can be ensured to improve the starting ability of the motor while reasonably utilizing the rotor space.

[0083] In some embodiments, the slit groove 2 is composed of an arc segment and / or a straight segment, the curvature of the arc segment of the slit groove 2 gradually increases from the shaft hole side to the outer circle side of the first rotor lamination, the curvature of the outer circle arc of the slit groove in the same layer is greater than the curvature of the inner circle arc, and the arc segment protrudes away from the shaft hole side; or, the two ends of the slit groove 2 extend into straight segments along the d-axis direction, part or all of the two ends of the slit groove 2 are parallel to the d-axis, and the width of the slit groove 2 gradually increases from the middle position of the slit groove 2 to the two ends. In this way, the utilization rate of the rotor space can be increased, the slit groove can be reasonably arranged to increase the rotor salient pole ratio and improve the magnetic reluctance torque of the motor.

[0084] In some embodiments, the curve length between the ends of each layer of the slit groove 2 close to the two second filling slots 32 gradually decreases from the shaft hole side to the outer circle side of the first rotor lamination, and the curve length decreasing ratio of adjacent slit grooves 2 is 5% to 25%. The purpose of this arrangement is to ensure a certain proportion of magnetic barrier layer ratio while reasonably utilizing the rotor space to improve the performance of the motor.

[0085] In some embodiments, the width of the slit groove 2 on the q-axis direction at least continuously decreases by 3 layers away from the d-axis direction; the width of the slit groove 2 on the q-axis direction is d2, the width of the first filling slot 31 on the q-axis direction is d1, the sum of the widths of all slit grooves 2 and first filling slots 31 on the q-axis direction is (d1+∑d2), the width from the hole wall of the shaft hole 4 to the outer circle of the first rotor lamination is d3, and (d1+∑d2) / d3=0.2 to 0.5, more preferably, (d1+∑d2) / d3=0.3 to 0.4. Selecting a reasonable magnetic barrier ratio can ensure sufficient magnetic barrier width and reasonable magnetic flux channel, increase the salient pole ratio of the motor, and prevent the magnetic circuit from being oversaturated.

[0086] In some embodiments, the minimum width of the magnetic flux channel between the adjacent two filling slots in the adjacent two layers of magnetic barrier layers is W, W≥d, d is the minimum width of the magnetic flux channel between the slit grooves in the adjacent two layers of magnetic barrier layers, and preferably, W / d>1.15. Ensuring sufficient width between the filling slots can prevent magnetic field saturation and affect the magnetic flux flow between the magnetic barrier layers.

[0087] In some embodiments, the minimum distance along the q-axis between two adjacent slit slots 2 in two adjacent magnetic barrier layers is h3, where h3 ≥ 1.5h4, where h4 is the smaller width of the slit slots 2 in the two adjacent magnetic barrier layers along the q-axis than the minimum width of the magnetic barrier layer along the q-axis. This configuration can reduce rotor manufacturing difficulty and ensure uniformity and unsaturation of the rotor's magnetic flux density distribution.

[0088] In some embodiments, a spacing rib is provided between the second filling slot 32 and the slit slot 2 in each inner magnetic barrier layer. The spacing rib has a minimum width k11 along the d-axis, where k11 ≥ 0.5*σ, where σ is the width of the air gap between the rotor core and the stator core. This arrangement ensures the mechanical strength of the rotor structure.

[0089] In some embodiments, the axial plane of the side of the spacing rib near the rotor outer circumference has a center point. The distance along the d-axis between the spacing rib of the outermost magnetic barrier layer near the rotor outer circumference and the spacing rib of the adjacent magnetic barrier layer is k7. The distance along the d-axis between the spacing rib of the outermost magnetic barrier layer near the rotor outer circumference and the spacing rib of the innermost magnetic barrier layer near the rotor shaft hole is k8. Then, 0≤k7 / k8≤0.6, preferably, 0≤k7 / k8≤0.4, and more preferably, 0≤k7 / k8≤0.2. This configuration allows the outer filling slots to support the inner slit slots, reducing deformation of the rotor during manufacturing.

[0090] It should be noted that the aforementioned center point is the geometric center point of the axial plane where the side of the spacing rib close to the outer circle of the rotor is located. As a specific implementation method, Figure 1 As shown, the aforementioned plane is a rectangular plane extending along the axial direction of the first rotor punching 1. The geometric center point of this rectangular plane, that is, the intersection of its diagonals, is the midpoint of the side length of the spacer rib close to the outer circle of the rotor after being projected in the axial direction of the first rotor punching 1.

[0091] In some embodiments, the d-axis and the q-axis divide the first rotor punching 1 into four quadrants from the center of the shaft hole 4. In the first quadrant (for example Figure 1 The minimum distance from the geometric center of the spacing 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 (dimensionless), 28≤λ≤33 (dimension consistent with kq and kd), is used to limit the position and width of the spacing rib and further reduce the risk of rotor deformation.

[0092] In some embodiments, the width of the first filling slot 31 along the d-axis direction is smaller than the width along the d-axis direction between the ends of the two second filling slots 32 in the magnetic barrier layer adjacent to the first filling slot 31 on the side close to the slot slot 2. The purpose of such arrangement is to limit the width of the first filling slot along the d-axis direction to avoid deformation of the rotor towards the shaft hole side or the outer circle side due to excessive width.

[0093] In some embodiments, the ratio of the distance k12 of the inner side wall of the first filling slot 31 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 and the rotor outer circle is too small, and the processing difficulty increases.

[0094] In some embodiments, the ratio of the distance of the side edge of the two innermost magnetic barrier layers on the shaft hole side in the q-axis direction to the width of the shaft in the q-axis direction is greater than 1.2. On the one hand, it 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 on the other hand, it can enhance the mechanical strength of the rotor near the shaft. And / or, the ratio of the diameter of the arc segment of the side edge of the innermost magnetic barrier layer on the shaft hole side to the width of the shaft in the q-axis direction is greater than 2, so as to reasonably utilize the rotor space for the arrangement of the magnetic barrier layer.

[0095] In some embodiments, the maximum thickness of the first filling slot 31 along the q-axis direction is k, the maximum thickness of the second filling slot 32 in the magnetic barrier layer adjacent to the first filling slot 31 along the q-axis direction is k1, and the minimum thickness of the magnetic flux channel connected to the first filling slot along the q-axis direction is k2. Then 1

[0096] In some embodiments, the magnetic flux channels are formed between two adjacent magnetic barrier layers, and the width of each magnetic flux channel in the q-axis direction gradually decreases in the direction away from the d-axis. More preferably, the width of each magnetic flux channel in the q-axis direction at least three consecutive decreases in the direction away from the d-axis. The closer to the shaft hole, the greater the effect of the magnetic flux channel on the stator, and the greater the impact on the motor performance. This setting is based on the reasonable utilization of the rotor space to ensure the width of the magnetic flux channel close to the shaft hole, which helps to improve the motor performance.

[0097] The magnetic flux channel is formed between two adjacent magnetic barrier layers. For the magnetic flux channel composed of arc segments and straight line segments, the width of the magnetic flux channel (the shortest distance from a point on one side of the magnetic flux channel to the other side) gradually increases from the q-axis to both sides of the q-axis. The width of the magnetic flux channel defined here is the cross-sectional width through which the magnetic force line passes on the rotor. This arrangement helps to reduce the rotor magnetic flux saturation and reduce motor loss.

[0098] In some embodiments, in each layer of the magnetic barrier layer, the ratio of the width of the slit groove 2 on the q-axis to the width of the slit groove 2 near the end of the filling groove is τ1, which gradually increases from the innermost layer of the magnetic barrier layer to the outermost layer of the magnetic barrier layer. This ensures the width of the magnetic flux channel between the inner magnetic barrier layers and a certain proportion of the magnetic barrier layer ratio, improving the performance of the motor.

[0099] In each layer of the 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 2 on the q-axis is τ2, τ2>1.4, and preferably 1.5<τ2<3.0. Limiting the minimum value of this ratio ensures that the filling groove has a certain width to increase its area; limiting the range of this ratio can also ensure the width of the magnetic flux channel between the filling grooves.

[0100] In some embodiments, in the outer magnetic barrier layer near the outer circular side of the rotor, the width between the ends of the two second filling grooves 32 near the slit groove 2 along the d-axis direction is k3; in the inner magnetic barrier layer adjacent to the shaft hole side, the width between the ends of the two second filling grooves 32 near the slit groove 2 along the d-axis direction is k4, 0.5≤k3 / k4≤1 or 0.5≤k4 / k3≤1. Limited by the space of the rotor, this arrangement can increase the area of the filling groove and improve the starting ability of the motor.

[0101] In some embodiments, the width between the ends of the two second filling grooves 32 near the slit groove 2 along the d-axis direction is k5 for the outermost slit groove 2 near the outer circular side of the rotor; the width between the ends of the two second filling grooves 32 near the slit groove 2 along the d-axis direction is k6 for the innermost slit groove 2 near the shaft hole side of the rotor, then 0.5≤k5 / k6≤1 or 0.5≤k6 / k5≤1. Limited by the space of the rotor, this arrangement can increase the area of the filling groove and improve the starting ability of the motor.

[0102] In some embodiments, the maximum width of the shaft hole 4 on the first rotor lamination in the q-axis direction is not greater than the maximum width in the d-axis direction. This arrangement can increase the utilization rate of the rotor space to reasonably arrange the slit groove and increase the rotor salient pole ratio to improve the motor reluctance torque.

[0103] The shaft hole 4 is composed of arc segments and / or straight line segments, i.e. the shape of the shaft hole is not limited to be circular or elliptical or oval or quadrilateral, and the shape of the shaft hole can be flexibly set according to the arrangement of the slot.

[0104] In some embodiments, the rotor core further comprises a second rotor lamination 10, which is arranged between the end ring 12 and the first rotor lamination 1, and a communication slot 11 is arranged on the second rotor lamination 10 corresponding to the filling slot, which has the same function as the filling slot.

[0105] In some embodiments, the maximum width of the outer contour of the second rotor lamination 10 is not greater than the outer diameter of the first rotor lamination 1, and the maximum width of the inner hole of the second rotor lamination 10 on the q-axis is not less than the maximum width on the d-axis, preferably, the ratio of the maximum width of the inner hole of the second rotor lamination 10 on the q-axis to the maximum width on the d-axis is 1-1.5. The outer contour of the second rotor lamination 10 as a part of the rotor needs to be not greater than the outer circle of the first rotor lamination 1 to form a certain width air gap with the stator; the q-axis direction of the inner contour of the second rotor lamination 10 corresponds to the slot of the first rotor lamination, and the q-axis width needs to be not less than the d-axis width to make enough area of the slot directly contact with air to form a flow-through hole and increase the heat dissipation of the rotor.

[0106] The axial thickness of the second rotor lamination 10 is not less than the thickness of the single-piece first rotor lamination 1 to ensure the mechanical strength of the rotor.

[0107] In some embodiments, the radial width between the inner hole and the outer circle of the second rotor lamination 10 is the smallest on the q-axis, and the radial width kd1 of the second rotor lamination 10 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 enough slots 2 on the first rotor lamination 1 are located within the inner hole of the second rotor lamination 10.

[0108] In some embodiments, the total area of the communication slots 11 on the second rotor lamination 10 is less than or equal to the total area of the filling slots on the first rotor lamination 1. The communication slots 11 on the second rotor lamination 10 are the inlets when filling the material into the filling slots on the first rotor lamination 1. The communication slots are arranged on the second rotor lamination to enable the filling material to enter the filling slots on the first rotor lamination 1. Ensuring that the total area of the communication slots 11 of the second rotor lamination 10 is not greater than the total area of the filling slots arranged on the first rotor lamination 1 can reduce the stress area of the non-filling slot part of the first rotor lamination during the filling of the material, ensure the mechanical strength of the first rotor lamination during the filling of the material, and reduce the deformation amount.

[0109] The communication groove 11 on the second rotor lamination 10 is located at the same position as the filling groove on the first rotor lamination 1, and the area of the single communication groove 11 on the second rotor lamination 10 is not greater than the area of the single filling groove on the first rotor lamination 1 at the same position, so as to reduce the local deformation of the first rotor lamination when the filling material is filled.

[0110] In some embodiments, the width of the inner hole of the second rotor lamination 10 and the communication groove 11 along the d-axis direction is greater than the width of the spacer between the communication groove 11 and the corresponding slit groove 2 along the d-axis direction, so as to ensure that the slit groove 2 is not filled during the manufacturing process of the rotor.

[0111] In some embodiments, the total area of the slit groove 2 on the first rotor lamination 1 located on the inner hole of the second rotor lamination 10 accounts for at least 20% of the total area of the motor flow-through hole, preferably 25%-40%, and / or the total area of the slit groove 2 on the first rotor lamination 1 located in the inner hole of the second rotor lamination 10 accounts for at least 30% of the total area of the slit groove 2, preferably 45%-65%, so as to ensure that a sufficient area of the slit groove directly contacts air to form a flow-through hole and increase the heat dissipation of the rotor. It should be noted that the total area of the motor flow-through hole includes the total area of the flow-through hole of the stator core of the motor and the total area of the slit groove 2 that is not blocked by the second rotor lamination 10 (i.e., the total area of the slit groove 2 in the inner hole of the second rotor lamination 10).

[0112] In some embodiments, from the rotor shaft hole side to the rotor outer circle side, the area of the slit groove 2 in the second rotor lamination 10 gradually decreases in each layer of the magnetic barrier layer on the first rotor lamination 1. At this time, the corresponding end ring 12 has a certain thickness along the q-axis direction at the magnetic barrier layer close to the rotor outer circle side, which can ensure that the end ring 12 has a certain volume to improve the starting ability of the motor.

[0113] In some embodiments, the maximum width of the outer contour of the end ring 12 is not greater than the maximum width of the outer contour of the second rotor lamination 10, and the maximum distance from the rotor core center to the end surface of the end ring 12 is not less than the maximum distance from the rotor core center to the end surface of the second rotor lamination 10. The maximum width of the outer contour of the end ring 12 is not greater than the maximum width of the outer contour of the second rotor lamination 10, so as to ensure that the part of the first rotor lamination located on the outer circle side of the rotor and not covered by the second rotor lamination 10 is subjected to stress when the filling material is filled, and the local deformation is reduced. The maximum distance from the rotor core center to the end surface of the end ring 12 is not less than the maximum distance from the rotor core center to the end surface of the second rotor lamination 10, so as to ensure that the rotor has a certain volume of end ring, which helps to improve the starting ability of the motor.

[0114] The radial width between the inner hole of the end ring 12 and the outer circle is k9 in the d-axis direction and k10 in the q-axis direction, and 1.1≤k9 / k10≤2.8, preferably, 1.2≤k9 / k10≤1.8. The width of the inner layer filling groove near the shaft hole side is larger in the d-axis direction, so that the radial width of the end ring in the d-axis direction is larger to make the filling groove short-circuit by itself. In order to ensure the area of the slit groove directly contacting the air, the radial width of the end ring in the d-axis direction cannot be too large. The balance block is installed on the end ring 12, and the balance block is located on the side with larger radial width between the inner hole of the end ring 12 and the outer circle.

[0115] At least part of the filling groove is filled with conductive and non-magnetic material, and the short circuit is realized through the end ring 12 at both ends of the second rotor sheet 10 to form a squirrel cage, and the material of the end ring 12 is the same as the filling material in the filling groove. The squirrel cage structure short-circuits itself to provide asynchronous torque during the starting stage of the motor to realize the self-starting of the motor, saves the controller loss, and improves the efficiency of the motor. The multi-layer magnetic barrier layer structure provides a magnetic resistance torque to realize the synchronous operation of the motor.

[0116] The plane where the side surface of the partition rib 5 is located is parallel or intersects with the plane where the q-axis is located, that is, the shape of the partition rib is not limited to be rectangular or trapezoidal or arc-shaped, and specifically, for example, Figure 4 The plane where the side surface of the partition rib 5 is located is parallel or intersects with the plane where the q-axis is located, that is, the shape of the partition rib is not limited to be rectangular or trapezoidal or arc-shaped, and specifically, for example, Figure 1 The parallel case is shown in the figure.

[0117] The present application provides a motor rotor, by limiting the maximum width of the q-axis filling groove 311 in the d-axis direction, the saturation of the channel between the outer magnetic barrier layer of the rotor can be reduced, which helps to reduce the motor harmonics, reduce the torque ripple, reduce the harmonic loss, and improve the efficiency and stability of the motor. At the same time, the outermost magnetic barrier layer near the outer circle of the rotor is the part that is most prone to deformation, and the q-axis filling groove 311 here has a segmented structure, which can reduce the deformation of the rotor. Limiting the width of the partition rib 5 between each q-axis filling groove 311 can ensure the stress area of the outermost magnetic barrier layer of the rotor, further enhance the mechanical strength of the rotor, reduce the deformation of the rotor during manufacturing, and reduce the process difficulty.

[0118] It can be understood that the length, width, thickness, diameter, etc. of the rotor core related structure in the present application can be preferably measured in mm, and other appropriate units of measurement can also be selected under reasonable circumstances.

[0119] The application provides a self-starting synchronous reluctance motor rotor, asynchronous torque provided by rotor bars (i.e. components formed after filled slots are filled) is used to realize self-starting of the motor, the problem that the synchronous reluctance motor needs a frequency converter to drive is solved, meanwhile, the loss of the motor is reduced and the efficiency of the motor is improved; the motor rotor can reduce the harmonics of the motor, reduce torque ripple, reduce harmonic loss, improve the efficiency and operation stability of the motor; the mechanical strength of the rotor can be enhanced, the deformation of the rotor in the manufacturing process is reduced, and the process difficulty is reduced.

[0120] 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 motor rotor described above, 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.

[0121] According to the embodiments of the application, a compressor is also provided, which comprises the self-starting synchronous reluctance motor described above.

[0122] Those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0123] The above is only the preferred embodiment of the application, and is not used to limit the application, and any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the application. The above is only the preferred embodiment of the application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the application, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection scope of the application.

Claims

1. An electric machine rotor, characterized in that, The rotor core comprises a first rotor lamination (1) having a filling slot and a slit slot (2) formed therein, the filling slot comprises a second filling slot (32) and a first filling slot (31), the first rotor lamination (1) is provided with a plurality of layers of magnetic barrier layers spaced along the q-axis thereof, the plurality of layers of magnetic barrier layers comprise 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 the first filling slot (31), the inner magnetic barrier layer comprises the slit slot (2) and the second filling slot (32) at both ends of the slit slot (2), the first filling slot (31) comprises a plurality of q-axis filling slots (311), two adjacent q-axis filling slots (311) have a partition rib (5) therebetween, the width of the partition rib (5) in the d-axis direction is L1, L1>0.1M1, L1>0.1M2, L1>0.05(M1+M2), wherein M1 and M2 are the maximum widths of the two adjacent q-axis filling slots (311) in the d-axis direction, respectively; from the shaft hole side to the outer circular side of the first rotor lamination, the curve length between the end portions of each layer of slit slots (2) close to the two second filling slots (32) gradually decreases, the curve length decreasing ratio of adjacent slit slots (2) is 5%-25%; and / or, in the direction away from the d-axis, the width of the slit slot (2) on the q-axis decreases by at least 3 layers continuously; the width of the slit slot (2) on the q-axis is d2, the width of the first filling slot (31) on the q-axis is d1, the sum of the widths of all slit slots (2) and first filling slots (31) on the q-axis is (d1+∑d2), the width of the hole wall of the shaft hole (4) to the outer circle of the first rotor lamination is d3, (d1+∑d2) / d3=0.2-0.5; L1≥σ, σ is the width of the air gap formed between the rotor core and the stator core after the rotor core is assembled with the corresponding stator core.

2. The electric machine rotor of claim 1, wherein, The sum of the widths of all partition ribs (5) in the d-axis direction is ∑L1, ∑L1>∑0.1(M1+M2).

3. The motor rotor of claim 1, wherein The width difference of each partition rib (5) is within ±20%.

4. The motor rotor of claim 1, wherein, The number of partition ribs (5) in the same first filling slot (31) is y, 1≤y≤4, and y / Rr≥0.04, wherein Rr is the rotor radius.

5. The motor rotor of claim 1, wherein, ∑L1 / Rr≥0.

045.

6. The motor rotor of claim 1, wherein, The filling area difference of each q-axis filling slot (311) is within ±30%; and / or, each q-axis filling slot (311) extends in the direction parallel to the d-axis.

7. The electric machine rotor of claim 6, wherein, The filling area difference of each q-axis filling slot (311) is within ±15%.

8. The motor rotor of claim 1, wherein, The included angle between the two ends of the first filling slot (31) and the center line of the rotor is α1, 20°≤α1≤60°; and / or, the number of q-axis filling slots (311) in the first filling slot (31) is n, 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%.

9. The electric machine rotor of claim 1, wherein, The interval between the filling slot of the innermost magnetic barrier layer close to the shaft hole side and the outer circle of the rotor is h1, the interval between the outermost magnetic barrier layer close to the outer circle of the rotor and the outer circle of the rotor is h2, h2≥h1, and 0≤h1≤2.5σ, σ is the width of the air gap between the rotor core and the corresponding stator core after the rotor core and the stator core are assembled; and / or, the first rotor lamination (1) has at least five filling slots with different filling areas; and / or, the total filling area of the first filling slot (31) and the second filling slot (32) accounts for 30%-70% of the total area of the first filling slot (31), the second filling slot (32) and the slit slot (2).

10. The motor rotor of claim 1, wherein, The maximum width of the end of the filling slot close to the outer circle side of the first rotor lamination in the q-axis direction is not greater than the maximum width of the end close to the shaft hole (4) in the q-axis direction.

11. The electric machine rotor of claim 10, wherein, The deviation between the maximum width of the end of the filling slot close to the outer circle side of the first rotor lamination in the q-axis direction and the maximum width of the end close to the shaft hole (4) in the q-axis direction is not greater than 5%.

12. The electric machine rotor of claim 10, wherein, The ratio between the maximum width and the minimum width of the filling slot in the q-axis direction is τ, 1≤τ≤2.

13. The electric machine rotor of claim 12, wherein, 1.3≤τ≤1.

5.

14. The electric machine rotor of claim 1, wherein, The maximum width of each second filling slot (32) in the d-axis direction gradually increases in the direction close to the d-axis.

15. The electric machine rotor of claim 14, wherein, The maximum width of each second filling slot (32) in the d-axis direction continuously increases for at least 3 layers in the direction close to the d-axis; and / or, in the direction away from the d-axis, the maximum width of each second filling slot (32) in the d-axis direction continuously decreases from the second layer of the inner magnetic barrier layer close to the d-axis to the magnetic barrier layer close to the outer circle side of the rotor.

16. The electric machine rotor of claim 1, wherein, The slit slot (2) is composed of an arc segment and / or a straight line segment, and the curvature of the arc segment of the slit slot (2) gradually increases from the shaft hole side to the outer circle side of the first rotor lamination, and the outer circle arc of the same layer slit slot has a larger curvature than the inner circle arc, and the arc segment protrudes away from the shaft hole side; or, the two ends of the slit slot (2) extend into straight line segments along the d-axis direction, and part or all of the two ends of the slit slot (2) are parallel to the d-axis, and the width of the slit slot (2) gradually increases from the middle position of the slit slot (2) to the two ends.

17. The electric machine rotor of claim 1, wherein, The minimum width of the magnetic flux channel between the two adjacent filling slots in the adjacent two layers of magnetic barrier layers is W, W≥d, d is the minimum width of the magnetic flux channel between the slit slots in the adjacent two layers of magnetic barrier layers.

18. The electric machine rotor of claim 17, wherein, W / d>1.

15.

19. The electric machine rotor of claim 1, wherein, The minimum distance of the magnetic flux channel between the two adjacent slit slots (2) in the adjacent two layers of magnetic barrier layers in the q-axis direction is h3, h3≥1.5h4, h4 is the minimum width of the magnetic barrier layer with smaller width in the q-axis direction of the slit slots (2) in the adjacent two layers of magnetic barrier layers in the q-axis direction.

20. The electric machine rotor of claim 1, wherein, There is a spacing rib between the second filling slot (32) and the slit slot (2) in each inner magnetic barrier layer, and the spacing rib has a minimum width k11 in the d-axis direction, k11≥0.5*σ, σ is the width of the air gap between the rotor core and the stator core.

21. The electric machine rotor of claim 20, wherein, The axial plane where the side of the partition rib close to the outer circle of the rotor is located has a center point, the distance between the center points corresponding to the partition rib of the outermost magnetic barrier layer close to the outer circle of the rotor and the partition rib of the magnetic barrier layer adjacent to the outermost magnetic barrier layer along the d-axis direction is k7, and the distance between the center points corresponding to the partition rib of the outermost magnetic barrier layer close to the outer circle of the rotor and the partition rib of the innermost magnetic barrier layer close to the shaft hole of the rotor along the d-axis direction is k8, and 0≤k7 / k8≤0.

6.

22. The electric machine rotor of claim 1, wherein, The d-axis and the q-axis divide the first rotor lamination (1) into four quadrants with the center of the shaft hole (4) as the center, in the first quadrant, the minimum distance from the geometric center of the partition rib to the d-axis is kd, and the minimum distance from the geometric center of the partition rib to the q-axis is kq, and kq=-ν*kd+λ, wherein 0.28≤ν≤0.46, and 28≤λ≤33; and / or, the width of the first filling groove (31) along the d-axis direction is less than the width between the ends of the two second filling grooves (32) in the magnetic barrier layer adjacent to the first filling groove (31) along the d-axis direction.

23. The electric machine rotor of claim 1, wherein, The ratio of the distance K12 from the inner side wall of the first filling groove (31) 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 close to the shaft hole of the two innermost magnetic barrier layers close to the shaft hole in the q-axis direction to the width of the shaft in the q-axis direction is greater than 1.2; and / or, the ratio of the diameter of the arc segment of the side close to the shaft hole of the innermost magnetic barrier layer close to the shaft hole to the width of the shaft in the q-axis direction is greater than 2.

24. The electric machine rotor of claim 1, wherein, The maximum thickness of the first filling groove (31) along the q-axis direction is k, the maximum thickness of the second filling groove (32) in the magnetic barrier layer adjacent to the first filling groove (31) along the q-axis direction is k1, and the minimum thickness of the magnetic flux channel along the q-axis direction is k2, and 1 25. The electric machine rotor of claim 1, wherein, The magnetic flux channels are formed between adjacent two layers of magnetic barrier layers, and the width of each magnetic flux channel in the q-axis direction gradually decreases in the direction away from the d-axis.

26. The electric machine rotor of claim 25, wherein, The width of each magnetic flux channel in the q-axis direction gradually decreases at least three times in the direction away from the d-axis; and / or, the magnetic flux channels are formed between adjacent two layers of magnetic barrier layers, and 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.

27. The electric motor rotor of claim 1, wherein, In each layer of the magnetic barrier layer, the ratio of the width of the slot groove (2) in the q-axis direction to the width of the slot groove (2) 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; and / or, in each layer of the magnetic barrier layer, the ratio of the maximum width of the filling groove along the q-axis direction to the width of the slot groove (2) in the q-axis direction is τ2, and τ2>1.

4.

28. The electric motor rotor of claim 1, wherein, The width between the ends of the two second filling slots (32) on the outer layer of the magnetic barrier layer near the outer side of the rotor and on the side near the slot (2) in the d-axis direction is k3; the width between the ends of the two second filling slots (32) on the inner layer of the magnetic barrier layer near the shaft hole side and on the side near the slot (2) in the d-axis direction is k4, and 0.5≤k3 / k4≤1 or 0.5≤k4 / k3≤1.

29. The electric motor rotor of claim 1, wherein, The width between the ends of the two second filling slots (32) on the outermost layer of the slot (2) near the outer side of the rotor and on the side near the slot (2) in the d-axis direction is k5; the width between the ends of the two second filling slots (32) on the innermost layer of the slot (2) near the shaft hole side of the rotor and on the side near the slot (2) in the d-axis direction is k6, and 0.5≤k5 / k6≤1 or 0.5≤k6 / k5≤1.

30. The electric motor rotor of claim 1, wherein, The maximum width of the shaft hole (4) on the first rotor punching sheet in the q-axis direction is not greater than the maximum width in the d-axis direction; and / or, the shaft hole (4) is composed of an arc segment and / or a straight line segment.

31. The motor rotor of claim 1, wherein, The rotor core further comprises a second rotor punching sheet (10) arranged between the end ring (12) and the first rotor punching sheet (1), and a communication slot (11) is arranged on the second rotor punching sheet (10) corresponding to the filling slot.

32. The electric motor rotor of claim 31, wherein, The maximum width of the outer contour of the second rotor punching sheet (10) is not greater than the outer diameter of the first rotor punching sheet (1), the maximum width of the inner hole of the second rotor punching sheet (10) in the q-axis direction is not less than the maximum width in the d-axis direction; and / or, the axial thickness of the second rotor punching sheet (10) is not less than the thickness of the single first rotor punching sheet (1).

33. The electric machine rotor of claim 32, wherein, The ratio of the maximum width of the inner hole of the second rotor punching sheet (10) in the q-axis direction to the maximum width in the d-axis direction is 1-1.

5.

34. The electric motor rotor of claim 31, wherein, The radial width between the inner hole of the second rotor punching sheet (10) and its outer circle is the smallest in the q-axis direction, and the radial width kd1 of the second rotor punching sheet (10) in the d-axis direction and the radial width kq1 thereof in the q-axis direction satisfy 1.1≤kd1 / kq1≤2.8; or, the total area of the communication slots (11) on the second rotor punching sheet (10) is less than or equal to the total area of the filling slots on the first rotor punching sheet (1).

35. The electric machine rotor of claim 34, wherein, 1.2≤kd1 / kq1≤1.8; or, the communication slots (11) arranged on the second rotor punching sheet (10) are arranged at the same positions as the filling slots on the first rotor punching sheet (1), and the area of a single communication slot (11) on the second rotor punching sheet (10) is not greater than the area of a single filling slot at the same position on the first rotor punching sheet (1).

36. The motor rotor of claim 31, wherein, The width of the inner hole of the second rotor lamination (10) and the communication groove (11) in the d-axis direction is greater than the width of the interval rib between the communication groove (11) and the corresponding slot (2) in the d-axis direction; or the total area of the slot (2) on the first rotor lamination (1) located on the inner hole of the second rotor lamination (10) accounts for at least 20% of the total area of the motor flow-through hole; and / or the total area of the slot (2) on the first rotor lamination (1) located in the inner hole of the second rotor lamination (10) accounts for at least 30% of the total area of the slot (2).

37. The electric machine rotor of claim 36, wherein, The total area of the slot (2) on the first rotor lamination (1) located on the inner hole of the second rotor lamination (10) accounts for 25% to 40% of the total area of the motor flow-through hole; and / or the total area of the slot (2) on the first rotor lamination (1) located in the inner hole of the second rotor lamination (10) accounts for 45% to 65% of the total area of the slot (2).

38. The electric motor rotor of claim 31, wherein, From the rotor shaft hole side to the rotor outer circle side, the area of the slot (2) in each layer of the magnetic barrier layer on the first rotor lamination (1) located on the inner hole of the second rotor lamination (10) gradually decreases.

39. The electric motor rotor of claim 31, wherein, The maximum width of the outer contour of the end ring (12) is not greater than the maximum width of the outer contour of the second rotor lamination (10), the maximum distance from the rotor core center to the end surface of the end ring (12) is not less than the maximum distance from the rotor core center to the end surface of the second rotor lamination (10); and / or the radial width between the inner hole and the outer circle of the end ring (12) is k9 in the d-axis direction and k10 in the q-axis direction, then 1.1≤k9 / k10≤2.

8.

40. The electric motor rotor of claim 39, wherein, 1.2≤k9 / k10≤1.

8.

41. The motor rotor of claim 1, wherein, At least part of the filling groove is filled with conductive and non-magnetic material, and the short circuit is realized through the end ring (12) at both ends of the second rotor lamination (10) to form a squirrel cage.

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

43. A compressor characterized by, The self-starting synchronous reluctance motor of claim 42. The self-starting synchronous reluctance motor of claim 42.

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