Motor rotor, self-starting synchronous reluctance motor and compressor

Abstract

A motor rotor, a self-starting synchronous reluctance motor and a compressor thereof are provided. The motor rotor includes a rotor core, which includes a first rotor punching plate (4), an end ring (3) and a second rotor punching plate (2). The first rotor punching plate (4) is provided with a filling groove, a rotor groove (6) and a shaft hole (7), and the filling groove includes a second filling groove (52) and a first filling groove (51). The second rotor punching plate (2) is provided between the end ring (3) and the first rotor punching plate (4), and the second rotor punching plate (2) has a communicating groove (21) provided in correspondence with the filling groove of the first rotor punching plate (4), and the total cross-sectional area of ​​the rotor grooves (6) in the first rotor punching plate (4) located between the inner hole edge and the outer circle of the second rotor punching plate (2) is smaller than the total cross-sectional area of ​​the rotor grooves (6) in the first rotor punching plate (4).

Description

Technical Field

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

[0002] This application claims the priority of a Chinese patent application filed with the China National Intellectual Property Administration on January 26, 2022, with an application number of 202210092227.8 and an application title of "Motor Rotor, Self-Starting Synchronous Reluctance Motor Thereof, and Compressor", the entire content of which is incorporated herein by reference.

Background Art

[0003] The self-starting synchronous reluctance motor is based on the synchronous reluctance motor and combines the advantages of an asynchronous motor. It can achieve self-starting by the asynchronous torque generated by the rotor bars and does not need to be driven by an inverter. Compared with an asynchronous motor, the motor can operate at a constant speed, has low rotor losses, and improved efficiency during synchronous operation. Compared with an asynchronous starting type permanent magnet synchronous motor, since this motor does not use permanent magnet materials, it has a low cost and there is no problem of demagnetization of permanent magnets. However, due to the multiple magnetic barrier layers of the self-starting synchronous reluctance motor, there is a problem that it is difficult for the motor to dissipate heat.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Therefore, the present invention provides a motor rotor, a self-starting synchronous reluctance motor thereof, and a compressor that can solve the defect that it is difficult for a motor to dissipate heat because the motor rotor of the self-starting synchronous reluctance motor in the prior art has multiple magnetic barrier layers.

Means for Solving the Problems

[0005] To solve the above problems, the present invention provides a motor rotor including a rotor core, the rotor core including a first rotor punched plate, an end ring, and a second rotor punched plate. The first rotor punched plate has filling grooves, rotor grooves, and shaft holes, the filling grooves include a second filling groove and a first filling groove, the first rotor punched plate has two outer filling layers provided near the outer circle of the rotor along the q axis, each outer filling layer includes a first filling groove, and between the two outer filling layers, multiple layers of magnetic barrier layers are provided at intervals along the q axis, each of the multiple layers of magnetic barrier layers is one Rotor grooves and the ends of the rotor grooves two The magnetic barrier layer of the same layer includes a second filling groove, and there is a divided rib between the second filling groove and the rotor groove, the second rotor punching plate is provided between the end ring and the first rotor punching plate, the second rotor punching plate has a communicating groove corresponding to the filling groove of the first rotor punching plate, and the rotor groove in the first rotor punching plate is located between the inner hole edge and the outer circle of the second rotor punching plate Part 1 The total cross-sectional area is smaller than the total cross-sectional area of ​​the rotor grooves in the first rotor punching plate.

[0006] In some embodiments, the rotor groove located in the inner bore of the second rotor punching plate in the first rotor punching plate Part 2 The total cross-sectional area accounts for at least 30% of the total cross-sectional area of ​​the rotor grooves, and / or the maximum width of the outer contour of the second rotor punching plate is less than or equal to the diameter of the outer circle of the first rotor punching plate, and / or the maximum width of the inner hole of the second rotor punching plate in the q-axis is greater than or equal to the maximum width in the d-axis.

[0007] In some embodiments, the lengths of at least two of the lines connecting the center of the rotor core and points at different locations on the inner hole edge of the second rotor punched plate are not equal.

[0008] In some embodiments, the ratio of the maximum width of the inner hole of the second rotor punching plate in the q-axis to the maximum width in the d-axis is 1 to 1.5.

[0009] In some embodiments, the second rotor punching plate Rotation axis The axial thickness is greater than or equal to the thickness of one sheet of the first rotor punched plate.

[0010] In some embodiments, the total cross-sectional area of ​​the connecting grooves in the second rotor punching plate is less than or equal to the total cross-sectional area of ​​the filling grooves provided in the first rotor punching plate.

[0011] In some embodiments, the positions of the communication grooves provided on the second rotor punching plate and the filling grooves provided on the first rotor punching plate are corresponding and the same, and at the same position, the cross-sectional area of ​​a single communication groove on the second rotor punching plate is less than or equal to the cross-sectional area of ​​a single filling groove on the first rotor punching plate.

[0012] In some embodiments, the width in the d-axis direction between the inner hole and the communication groove of the second rotor punching plate is Second filling groove It must be greater than the width of the dividing rib between the rotor groove and the rotor groove.

[0013] In some embodiments, the radial width between the inner hole edge and the outer circle of the second rotor punching plate is not equal depending on the position, and the radial width kd1 in the d-axis and the radial width kq1 in the q-axis of the second rotor punching plate satisfy 1.1 ≤ kd1 / kq1 ≤ 2.8.

[0014] In some embodiments, the rotor groove located in the inner bore of the second rotor punching plate in the first rotor punching plate Part 2 The total cross-sectional area accounts for at least 20% of the total flow area of ​​the motor.

[0015] In some embodiments, from the rotor shaft hole side to the rotor outer circle side, the rotor grooves located within the inner bore of the second rotor punched plate in each layer of the magnetic barrier layer are provided in the first rotor punched plate. Part 2 The cross-sectional area gradually decreases.

[0016] In some embodiments, the maximum width of the outer contour of the end ring is less than or equal to the maximum width of the outer contour of the second rotor punching plate, and the maximum distance from the center of the rotor core to the end face of the end ring is greater than or equal to the maximum distance from the center of the rotor core to the end face of the second rotor punching plate.

[0017] In some embodiments, the radial width between the inner bore edge and the outer circle of the end ring is k9 in the d-axis and k10 in the q-axis, satisfying 1.1 ≤ k9 / k10 ≤ 2.8.

[0018] In some embodiments, the side of the divided rib that is closer to the outer circle of the rotor is located Rotation axis There is a center point in the axial plane, the distance in the d-axis direction between two such center points corresponding to two segmented ribs in any two adjacent magnetic barrier layers is L, and the maximum distance in the q-axis direction of the magnetic conduction channel formed between the filling grooves in the two adjacent magnetic barrier layers is W, satisfying 0 ≤ L < 2W.

[0019] In some embodiments, in the first quadrant consisting of the d-axis and the q-axis, the distances from the center of the segmented rib to the d-axis and q-axis satisfy kq = -ν*kd + λ, where kq is the distance from the center of the segmented rib to the q-axis, kd is the distance from the center of the segmented rib to the d-axis, and satisfies 0.28 ≤ ν ≤ 0.46 and 28 ≤ λ ≤ 33.

[0020] In some embodiments, the width of the rotor groove in the q-axis decreases in at least three consecutive layers in the direction from the q-axis axial hole toward the outer circle of the rotor.

[0021] In some embodiments, the minimum width of the magnetic conduction channel between two adjacent filling grooves is W1, and d is the minimum width of the magnetic conduction channel formed between the rotor grooves corresponding to the two filling grooves, such that W1 ≥ d.

[0022] In some embodiments, the minimum distance h1 in the q-axis direction of the magnetic conduction channel between two adjacent magnetic barrier layers must satisfy h1 ≥ 1.5h2, where h2 is the minimum width in the q-axis direction of the magnetic barrier layer with the smaller width in the q-axis direction among the two adjacent magnetic barrier layers.

[0023] In some embodiments, a magnetic conduction channel is formed between two adjacent magnetic barrier layers, and in the direction from the shaft hole of the q-axis towards the outer circle of the rotor, the width of each magnetic conduction channel in the q-axis gradually decreases.

[0024] In some embodiments, in the direction from the shaft hole of the q-axis towards the outer circle of the rotor, the width of each magnetic conduction channel in the q-axis decreases continuously for at least three layers, and / or a magnetic conduction channel is formed between two adjacent magnetic barrier layers. For the magnetic conduction channel composed of an arc portion and a straight line portion, from the q-axis to both sides of the q-axis, the width of the magnetic conduction channel gradually increases.

[0025] In some embodiments, in each magnetic barrier layer, the ratio of the width of the rotor groove in the q-axis to the width of the end portion close to the filling groove of the rotor groove is τ1, and from the innermost magnetic barrier layer to the outermost magnetic barrier layer, τ1 gradually increases.

[0026] In some embodiments, in each magnetic barrier layer, the ratio of the maximum width of the filling groove in the q-axis direction to the width of the rotor groove in the q-axis is τ2, and τ2 > 1.4.

[0027] [[ID=​​​​In some embodiments, in the outermost magnetic barrier layer near the outer circle of the rotor along the q-axis, the width in the d-axis direction between the ends of the two second filling grooves located at both ends of the rotor groove that are closer to the rotor groove is k5, and in the innermost magnetic barrier layer near the rotor shaft hole, the width in the d-axis direction between the ends of the two second filling grooves located at both ends of the rotor groove that are closer to the rotor groove is k6, such that 0.5 ≤ k5 / k6 ≤ 1, or 0.5 ≤ k6 / k5 ≤ 1.

[0029] In some embodiments, the first filling groove is located in the q-axis direction on the outer circumference of the rotor and has a segmented structure consisting of multiple q-axis filling grooves, with a rib provided between two adjacent q-axis filling grooves.

[0030] In some embodiments, the number of ribs in the first filling groove is y, where y satisfies 1 ≤ y ≤ 4.

[0031] In some embodiments, the width of the rib in the d-axis direction between any two adjacent q-axis filling grooves is L3, where L3 > 0.1M1, L3 > 0.1M2, and L3 > 0.05(M1 + M2), where M1 and M2 are the maximum widths in the d-axis direction of the two adjacent q-axis filling grooves.

[0032] In some embodiments, the sum of the widths of the ribs in the d-axis direction between any two adjacent q-axis filling grooves is

number

[0033] In some embodiments, the difference in the cross-sectional area of ​​each q-axis filling groove is within ±30%.

[0034] In some embodiments, the angle α1 of the line connecting both ends of the first filling groove and the center of the rotor satisfies 20° ≤ α1 ≤ 60°.

[0035] In some embodiments, the deviation in parallelism between the longitudinal extension direction of the filling groove and the d-axis is 5% or less.

[0036] In some embodiments, the width of the first filling groove in the d-axis direction is smaller than the width in the d-axis direction between the ends of the two second filling grooves in the adjacent magnetic barrier layer that are closer to the rotor groove.

[0037] In some embodiments, the ratio of the distance k12 from the inner wall of the first filling groove to the center of the rotor to the rotor radius Rr in the q-axis direction satisfies 0.82 ≤ k12 / Rr ≤ 0.96, and / or the ratio of the distance in the q-axis from the side edge of the innermost two magnetic barrier layers near the shaft hole to the width in the q-axis of the rotation axis is greater than 1.2.

[0038] In some embodiments, the ratio of the diameter of the arc portion on the side of the innermost magnetic barrier layer near the axial hole to the width along the q-axis of the rotation axis is greater than 2.

[0039] In some embodiments, the maximum thickness in the q-axis direction of the first filling groove is k, the maximum thickness in the q-axis direction of the second filling groove in the adjacent magnetic barrier layer is k1, and the minimum thickness in the q-axis direction of the magnetic conduction channel connected thereto is k2. <k / k1≦2、0.8<k / k2≦1.6である。

[0040] In some embodiments, the maximum width in the q-axis direction of the end of the filling groove near the outer circle side of the rotor is less than or equal to the maximum width in the q-axis direction of the region of the filling groove near the q-axis of the rotor.

[0041] In some embodiments, the width deviation in the q-axis direction of the filling groove from the outer circle side of the rotor to the q-axis of the rotor is 5% or less.

[0042] In some embodiments, the filling grooves in the first rotor punching plate have at least five types of filling grooves with different cross-sectional areas, and / or the total cross-sectional area of ​​the first and second filling grooves accounts for 30% to 70% of the total cross-sectional area of ​​the first filling groove, the second filling groove, and the rotor grooves.

[0043] In some embodiments, the ratio τ of the maximum and minimum thickness in the q-axis direction of all filling grooves satisfies 1 ≤ τ ≤ 2.

[0044] In some embodiments, 1.3 ≤ τ ≤ 1.5.

[0045] In some embodiments, the width of each second filling groove in the d-axis direction gradually increases in the direction from the outer circle of the q-axis rotor toward the shaft hole.

[0046] In some embodiments, the maximum width of each second filling groove in the d-axis direction increases in a continuous manner of at least three layers, in the direction from the outer circle of the q-axis rotor toward the shaft hole.

[0047] In some embodiments, the maximum width of each second filling groove in the d-axis direction decreases continuously from the second magnetic barrier layer to the outermost magnetic barrier layer closer to the outer circle of the rotor, in the direction from the q-axis axial hole toward the outer circle of the rotor.

[0048] In some embodiments, a conductive nonmagnetic material is filled into the grooves of at least some of the first and second filling grooves, and the filling grooves are self-short-circuited via end rings at both ends of the second rotor punching plate to form a cage structure.

[0049] In some embodiments, the rotor groove consists of arc portions and / or straight portions, the radius of curvature of the arc portions of the rotor groove gradually increases from the rotor shaft hole side to the rotor outer circle side, and the radius of curvature of the outer arc of the rotor groove in the same layer is greater than the radius of curvature of the inner arc, the arc portions project outward toward the shaft hole, or both ends of the rotor groove extend in the d-axis direction to become straight portions, and both ends of part or all of the rotor groove are parallel to the d-axis, and the width of the rotor groove gradually increases from the center to both ends.

[0050] In some embodiments, the length of the curve between the ends of each layer of rotor grooves near the two second filling grooves gradually decreases from the rotor shaft hole toward the outer circle of the rotor, with the rate of decrease in the length of the curves of adjacent rotor grooves being 5% to 25%, and / or the maximum width of the shaft hole in the q-axis direction is less than or equal to the maximum width of the shaft hole in the d-axis direction.

[0051] The present invention further provides a self-starting synchronous reluctance motor, which includes a stator and the motor rotor.

[0052] In some embodiments, the side of the divided rib that is closer to the outer circle of the rotor is located Rotation axis The center point lies in the axial plane, the distance in the d-axis direction between two such center points corresponding to two segmented ribs in any two adjacent magnetic barrier layers is L, the width of the air gap formed between the inner wall of the stator's inner circle and the rotor's outer circle is σ, and 0 ≤ L < 8σ.

[0053] In some embodiments, the width of the segmented ribs of the outermost magnetic barrier layer near the rotor's outer circle along the q-axis is L1 in the d-axis direction, and the width of the segmented ribs of the innermost magnetic barrier layer near the shaft hole is L2 in the d-axis direction, L1 is greater than or equal to L2, and L1 ≥ 0.5 * σ, where σ is the width of the air gap between the inner wall of the stator's inner circle and the rotor's outer circle.

[0054] In some embodiments, the first filling groove is located in the q-axis direction on the outer circumference of the rotor and has a segmented structure consisting of multiple q-axis filling grooves, with a rib provided between two adjacent q-axis filling grooves. The difference in width between each rib is within ±20%, and the minimum width L3 of each rib must satisfy L3≧σ, where σ is the width of the air gap between the inner wall of the inner circle of the stator and the outer circle of the rotor.

[0055] In some embodiments, the distance between the innermost magnetic barrier layer packing groove near the shaft hole along the q-axis and the outer circle of the rotor is h3, and the distance between the outer packing layer near the outer circle side of the rotor and the outer circle of the rotor is h4, where h4 ≥ h3 and 0 ≤ h3 ≤ 2.5σ, and σ is the width of the air gap between the inner wall of the stator's inner circle and the rotor's outer circle.

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

[0057] In the motor rotor, self-starting synchronous reluctance motor, and compressor according to the present invention, the structural design of the second rotor punched plate ensures that at least some of the rotor grooves are in direct contact with the air, forming flow holes and increasing heat dissipation from the rotor. [Brief explanation of the drawing]

[0058] [Figure 1] This is a schematic diagram of the three-dimensional structure of a motor rotor according to an embodiment of the present invention. [Figure 2] This is a schematic diagram of the axial structure of the first rotor punched plate of a motor rotor according to an embodiment of the present invention. [Figure 3] This is a schematic diagram of the axial structure of the second rotor punched plate of a motor rotor according to an embodiment of the present invention. [Figure 4] This is a schematic diagram of the axial structure of an electronic rotor according to an embodiment of the present invention. [Figure 5] This is a schematic diagram of the axial structure of the first rotor punched plate of a motor rotor according to another embodiment of the present invention. [Figure 6] This is a schematic diagram of the axial structure of the second rotor punched plate of a motor rotor according to another embodiment of the present invention. [Figure 7] This is a schematic diagram of the axial structure of an electronic rotor according to another embodiment of the present invention. [Figure 8] This is a comparison diagram of the temperature rise, losses, and efficiency of a motor using the technical solution of the present invention and a conventional motor. [Modes for carrying out the invention]

[0059] As shown in Figures 1 to 8, according to embodiments of the present invention, the present invention provides a self-starting synchronous reluctance motor rotor, which, through a special design of the rotor core, can increase the area in direct contact with the air, form flow grooves, and increase heat dissipation of the rotor.

[0060] The following describes specific embodiments with reference to the rotor in the drawings. Figure 1 is a schematic diagram of a motor rotor, which includes a rotor core, and the rotor core includes a first rotor punched plate 4, a second rotor punched plate 2, and an end ring 3. In some embodiments of the present application, as shown in Figure 2, the first rotor punched plate 4 is provided with a filling groove, a rotor groove 6, and a shaft hole 7, and the filling groove includes a first filling groove 51 and a second filling groove 52. The first rotor punched plate 4 has two outer filling layers provided along the q axis near the outer circle of the rotor, each outer filling layer includes a first filling groove 51, and between the two outer filling layers, multiple layers of magnetic barrier layers are provided at intervals along the q axis, and each of the multiple layers of magnetic barrier layers is one Rotor groove 6 and the ends of rotor groove 6 two The second filling groove 52 is included, and in the same magnetic barrier layer, there is a divided rib 8 between the second filling groove 52 and the rotor groove 6. The maximum width of the outer contour of the second rotor punching plate 2 is less than or equal to the diameter of the outer circle of the first rotor punching plate 4, and the maximum width of the inner hole of the second rotor punching plate 2 in the q-axis is greater than or equal to the maximum width in the d-axis. Of the lines connecting the center of the rotor core and points at different positions on the inner hole edge of the second rotor punching plate 2, the lengths of at least two lines are not equal. The second rotor punching plate 2 is positioned between the end ring 3 and the first rotor punching plate 4, and the second rotor punching plate 2 is provided with a communication groove 21 corresponding to the filling groove of the first rotor punching plate 4, and the rotor groove 6 in the first rotor punching plate 4 is located between the inner hole edge and the outer circle of the second rotor punching plate 2. Part 1The total cross-sectional area is smaller than the total cross-sectional area of ​​the rotor grooves 6 in the first rotor punched plate 4. The second rotor punched plate 2, as part of the rotor, needs to have an outer contour smaller than or equal to the outer circle of the first rotor punched plate 4 in order to form an air gap of a certain width between it and the stator. In the q-axis direction of its inner contour, the q-axis width needs to be greater than or equal to the d-axis width in order for the rotor grooves 6 with a sufficient cross-sectional area to be in direct contact with the air and form a flow hole, thereby increasing heat dissipation of the rotor. The lengths of at least two of the lines connecting the center of the rotor core and points at different positions on the inner hole edge of the second rotor punched plate 2 are not equal. This restriction ensures that the center of the rotor and the inner hole of the second rotor punched plate 2 are not equal. Located on the q-axis at the edge By increasing the length of the lines connecting the points, ,times Trochanteric groove 6 The larger portion of This can be prevented from being blocked by the second rotor punching plate 2. The rotor groove 6 located between the inner hole edge and the outer circle of the second rotor punching plate 2 in the first rotor punching plate 4 Part 1 The total cross-sectional area is smaller than the total cross-sectional area of ​​the rotor grooves 6 in the first rotor punching plate 4. That is, the second rotor punching plate 2 cannot cover all of the rotor grooves 6. The structural design of the second rotor punching plate 2 ensures that at least some of the rotor grooves 6 are in direct contact with the air, forming flow holes and increasing heat dissipation from the rotor. Figure 8 shows a comparison of the temperature rise, losses, and efficiency of motors using the present invention and conventional technology. As is clear from Figure 8, according to the present invention, the temperature rise of the motor is lower, and furthermore, copper and aluminum consumption can be reduced, and the efficiency of the motor can be improved.

[0061] In some embodiments, the rotor groove 6 located within the inner bore of the second rotor punching plate 2 in the first rotor punching plate 4 Part 2 The total cross-sectional area accounts for at least 30% of the total cross-sectional area of ​​the rotor groove 6, and in some embodiments, this ratio is 45% to 65%. The rotor groove 6 located within the inner bore of the second rotor punching plate 2 Part 2 By limiting the total cross-sectional area, it is ensured that a sufficient area of ​​rotor grooves 6 is in direct contact with the air, further increasing heat dissipation from the rotor.

[0062] In some embodiments, the ratio of the maximum width of the inner hole of the second rotor punching plate 2 in the q-axis to the maximum width in the d-axis is 1 to 1.5, and furthermore, sufficient area of ​​rotor grooves 6 is ensured to be in direct contact with the air.

[0063] In some embodiments, the stacking direction of the second rotor punching plate 2 and the first rotor punching plate 4 is, Rotation axis The axial thickness is greater than or equal to the thickness of one of the first rotor punched plates 4 to ensure the mechanical strength of the rotor.

[0064] In some embodiments, the second rotor punching plate 2 is provided with a communication groove 21, and the total cross-sectional area of ​​the communication groove 21 in the second rotor punching plate 2 is less than or equal to the total cross-sectional area of ​​the filling groove provided in the first rotor punching plate 4. The communication groove 21 in the second rotor punching plate 2 is an entrance for filling the filling groove in the first rotor punching plate 4 with material. By providing the communication groove 21 in the second rotor punching plate 2, the filling material can enter the filling groove in the first rotor punching plate 4, and by ensuring that the total cross-sectional area of ​​the communication groove 21 in the second rotor punching plate 2 is less than or equal to the total cross-sectional area of ​​the filling groove provided in the first rotor punching plate 4, the load-bearing area of ​​the unfilled groove portion of the first rotor punching plate 4 can be reduced when filling with material, thereby ensuring its mechanical strength during material filling and reducing the amount of deformation.

[0065] In some embodiments, the positions of the communication grooves 21 provided in the second rotor punching plate 2 and the filling grooves punched in the first rotor punching plate 4 are correspondingly the same, and at the same position, the cross-sectional area of ​​a single communication groove 21 in the second rotor punching plate 2 is less than or equal to the cross-sectional area of ​​a single filling groove in the first rotor punching plate 4, thereby reducing local deformation of the first rotor punching plate 4 when filling with material.

[0066] In some embodiments, the width in the d-axis direction between the inner hole and the communication groove 21 of the second rotor punching plate 2 is Second filling groove 52 The width of the dividing rib 8 between the rotor groove 6 must be greater than the width of the dividing rib 8 between the rotor groove 6, thereby ensuring that nothing fills the rotor groove 6 during the manufacturing of the rotor.

[0067] In some embodiments, the radial width between the inner hole edge and the outer circle of the second rotor punching plate 2 (i.e., the distance between the line connecting the center of the rotor and the outer circle of the rotor and the two points where the inner hole edge and the outer circle of the second rotor punching plate 2 intersect) is not equal depending on the position, and the radial width kd1 of the second rotor punching plate 2 in the d-axis and the radial width kq1 of the second rotor punching plate 2 in the q-axis satisfy 1.1 ≤ kd1 / kq1 ≤ 2.8, and in some embodiments, 1.2 ≤ kd1 / kq1 ≤ 1.8, so in the first rotor punching plate 4 ,times Trochanteric groove 6 a sufficiently large portion Ensure that it is located within the internal hole of the second rotor punching plate 2.

[0068] In some embodiments, the rotor groove 6 located within the inner bore of the second rotor punching plate 2 in the first rotor punching plate 4 Part 2 The total cross-sectional area accounts for at least 20% of the total flow area of ​​the motor (including the flow area of ​​the stator and the flow area of ​​the rotor). In one embodiment, this ratio is 25% to 40%, ensuring that rotor grooves 6 of sufficient area are in direct contact with the air, forming flow holes and increasing heat dissipation of the rotor.

[0069] In some embodiments, in the direction from the rotor shaft hole 7 toward the outer circle of the rotor along the q-axis, the rotor groove 6 located in the inner hole of the second rotor punch plate 2 in each layer of the magnetic barrier layer of the first rotor punch plate 4 is Part 2 The cross-sectional area gradually decreases. The end ring 3 has a constant thickness in the q-axis direction in the outermost magnetic barrier layer near the outer circle of the rotor along the q-axis, ensuring a constant volume of the end ring 3 and improving the motor's starting capability.

[0070] In some embodiments, the maximum width of the outer contour of the end ring 3 is less than or equal to the maximum width of the outer contour of the second rotor punching plate 2, and the maximum distance from the center of the rotor core to the end face of the end ring 3 is greater than or equal to the maximum distance from the center of the rotor core to the end face of the second rotor punching plate 2. The maximum width of the outer contour of the end ring 3 being less than or equal to the maximum width of the outer contour of the second rotor punching plate 2 ensures that the portion of the first rotor punching plate 4 located on the outer circle side of the rotor and not covered by the second rotor punching plate 2 receives the force during material filling, thereby reducing local deformation. The maximum distance from the center of the first rotor punching plate 4 to the end face of the end ring 3 is greater than or equal to the maximum distance from the center of the first rotor punching plate 4 to the end face of the second rotor punching plate 2, thereby ensuring that the rotor has an end ring 3 of a constant volume, which helps to improve the starting ability of the motor.

[0071] In some embodiments, the radial width between the inner bore edge and the outer circle of the end ring 3 is k9 in the d-axis and k10 in the q-axis, with 1.1 ≤ k9 / k10 ≤ 2.8, and in some embodiments, 1.2 ≤ k9 / k10 ≤ 1.8. The width of the inner layer filling groove closer to the shaft bore 7 is large in the d-axis direction, and the radial width of the end ring 3 in the d-axis direction is large in order to self-short-circuit the filling groove. The radial width of the end ring 3 in the d-axis direction should not be too large in order to ensure an area of ​​direct contact with the air of the rotor groove 6.

[0072] In some embodiments, in each magnetic barrier layer composed of the second filling groove 52 and the rotor groove 6, a dividing rib 8 is provided between the second filling groove 52 and the rotor groove 6. There is a center point in the axial plane where the side of the dividing rib 8 closer to the outer circle of the rotor is located. The distance in the d-axis direction between the two center points corresponding to the two dividing ribs 8 in any two adjacent magnetic barrier layers is L, and the maximum distance in the q-axis direction of the magnetic conduction channel formed between the filling grooves in the two adjacent magnetic barrier layers is W. L must satisfy 0 ≦ L < 2W. In some embodiments, 0 ≦ L < W. In some embodiments, 0 ≦ L ≦ 0.8W. By limiting the minimum distance between the rotor filling grooves, while reducing the saturation rate of the magnetic conduction channel between the filling grooves, the relative position of the magnetic conduction channel and the teeth of the stator can also be shifted, which is helpful for reducing the harmonics of the motor, reducing torque ripple, reducing harmonic losses, and improving the efficiency and operating stability of the motor.

[0073] Note that the above center point is the Rotation axis geometric center point of the axial plane where the side of the dividing rib 8 closer to the outer circle of the rotor is located. As a specific embodiment, as shown in FIG. 2, the above plane is the Rotation axis parallelogram plane extending in the axial direction of the first rotor punching plate 4. The geometric center point of this parallelogram plane, that is, the intersection of its diagonals, is the Rotation axis midpoint of the side of the dividing rib 8 closer to the outer circle of the rotor when projected in the axial direction of the first rotor punching plate 4.

[0074] In some embodiments, the width of the air gap formed between the inner wall of the inner circle of the stator and the outer circle of the rotor is σ, and L must satisfy 0 < L < 8σ. In some embodiments, 0 ≦ L ≦ 6σ. The dividing rib 8 can increase the mechanical strength of the rotor, reduce the deformation of the rotor during manufacturing, and reduce the difficulty of the process. By limiting the relative distance of the dividing rib 8 between each filling groove of the rotor and the rotor groove 6, the pressure receiving area between two adjacent magnetic barrier layers can be increased to achieve the effect of supporting each other, reducing the deformation of the rotor during manufacturing, and reducing the difficulty of the process.

[0075] In some embodiments, the width of the segmented rib 8 of the outermost magnetic barrier layer near the outer circle of the rotor along the q-axis is L1 in the d-axis direction, and the width of the segmented rib 8 of the innermost magnetic barrier layer near the shaft hole 7 in the d-axis direction is L2, L1 is greater than or equal to L2, and L1 ≥ 0.5 * σ, where σ is the width of the air gap between the stator and the rotor. By limiting the minimum width of the segmented rib 8, the difficulty of machining can be reduced and the mechanical strength of the rotor can be increased, and L1 ≥ L2 can be reduced, reducing magnetic flux leakage from the inner magnetic barrier layer and improving the efficiency of the motor.

[0076] In some embodiments, the plane on which the side of the segmented rib 8 is located is the plane on which the q-axis is located of the rotor Rotation axis The segmented ribs 8 are parallel to or intersect the plane along the axial direction; that is, the shape of the segmented ribs 8 is not limited to a rectangle, trapezoid, or arc. By flexibly selecting the shape of the segmented ribs 8 according to the direction of the magnetic field lines, magnetic flux leakage from the motor can be reduced.

[0077] In some embodiments, in the first quadrant consisting of the d-axis and q-axis, the distances from the center of the segmented rib 8 to the d-axis and q-axis satisfy kq = -ν*kd + λ, where kq is the distance from the center of the segmented rib 8 to the q-axis, kd is the distance from the center of the segmented rib 8 to the d-axis, the coefficient ν (dimensionless) satisfies 0.28 ≤ ν ≤ 0.46, and the coefficient λ (dimensions matching kq and kd) satisfies 28 ≤ λ ≤ 33, thereby limiting the position and width of the segmented rib 8 and reducing the risk of rotor deformation.

[0078] In some embodiments, the width of the rotor groove 6 in the q-axis direction decreases in at least three consecutive layers in the direction from the q-axis axial hole 7 toward the outer circle of the rotor. The sum of the widths of all rotor grooves 6 and the first filling groove 51 in the q-axis direction.

number

number

[0079] In some embodiments, the minimum width W1 of the magnetic conduction channel between two adjacent filling grooves must satisfy W1 ≥ d, where d is the minimum width of the magnetic conduction channel formed between the rotor grooves 6 corresponding to the two filling grooves, and in some embodiments, W1 / d > 1.15. The purpose is to ensure sufficient width between the filling grooves and to avoid magnetic field saturation occurring and affecting the magnetic flux flow in the channel between the magnetic barrier layers.

[0080] In some embodiments, the minimum distance h1 in the q-axis direction of the magnetic conduction channel between two adjacent magnetic barrier layers must satisfy h1 ≥ 1.5h2, where h2 is the minimum width in the q-axis direction of the magnetic barrier layer with the smaller width in the q-axis direction among the two adjacent magnetic barrier layers. This setting reduces the difficulty of rotor manufacturing and ensures uniformity and desaturation of the rotor's magnetic flux density distribution.

[0081] In some embodiments, a magnetic conduction channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic conduction channel in the q-axis direction decreases gradually from the q-axis hole toward the outer circle of the rotor. In some embodiments, the width of each magnetic conduction channel in the q-axis direction decreases for at least three consecutive layers. The closer the magnetic conduction channel is to the sprocket hole 7, the greater its interaction with the stator and the greater its impact on motor performance. This setting allows for rational use of rotor space while ensuring sufficient width of the magnetic conduction channel closer to the sprocket hole 7, thus contributing to improved motor performance. A magnetic conduction channel is formed between two adjacent magnetic barrier layers, and the width of the magnetic conduction channel (defined as the shortest distance from each point on one side of the two sides of the magnetic conduction channel to the other side) gradually increases from the q-axis toward both sides of the q-axis, with respect to the magnetic conduction channel consisting of an arc portion and a straight portion. The width of the magnetic conduction channel defined here is the cross-sectional width through which the magnetic field lines pass in the rotor. This setting helps to reduce the saturation rate of the rotor's magnetic flux density, thereby reducing motor losses.

[0082] In some embodiments, in each layer of magnetic barrier layers, the ratio of the width of the rotor groove 6 in the q-axis to the width of the end of the rotor groove 6 near the filling groove is τ1, and τ1 gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer. This not only ensures the width of the magnetic conduction channels between the inner magnetic barrier layers but also ensures a constant proportion of the magnetic barrier layers, improving the motor performance. In each layer of magnetic barrier layers, the ratio of the maximum width of the filling groove in the q-axis direction to the width of the rotor groove 6 in the q-axis direction is τ2, where τ2 > 1.4. In some embodiments, 1.5 < τ2 < 3.0. By limiting this ratio, a constant width of the filling groove can be ensured and its arrangement area can be increased, and by limiting the range of this ratio, the width of the magnetic conduction channels between the filling grooves can also be ensured.

[0083] In some embodiments, in the outer magnetic barrier layer near the outer circle of the rotor along the q-axis, the width in the d-axis direction between the ends of the two second filling grooves 52 located at both ends of the rotor groove 6 and closer to the rotor groove 6 is k3, and in the inner magnetic barrier layer adjacent to it and closer to the shaft hole 7, the width in the d-axis direction between the ends of the two second filling grooves 52 located at both ends of the rotor groove 6 and closer to the rotor groove 6 is k4, such that 0.5 ≤ k3 / k4 ≤ 1, or 0.5 ≤ k4 / k3 ≤ 1. When rotor space is limited, this setting can increase the area of ​​the filling grooves and improve the motor's starting capability.

[0084] In some embodiments, in the outermost magnetic barrier layer near the rotor's outer circle along the q-axis, the width in the d-axis direction between the ends of the two second filling grooves 52 located at both ends of the rotor groove 6 is k5, and in the innermost magnetic barrier layer near the rotor's shaft hole 7, the width in the d-axis direction between the ends of the two second filling grooves 52 located at both ends of the rotor groove 6 is k6, such that 0.5 ≤ k5 / k6 ≤ 1, or 0.5 ≤ k6 / k5 ≤ 1. When rotor space is limited, this setting can increase the area of ​​the filling grooves and improve the motor's starting capability.

[0085] In some embodiments, the first filling groove 51 is located in the q-axis direction on the outer circumference of the rotor and has a divided structure consisting of multiple q-axis filling grooves 511, with ribs 9 provided between two adjacent q-axis filling grooves 511. The number of ribs 9 in the first filling groove 51 is y, where y satisfies 1 ≤ y ≤ 4. The outermost filling layer consisting of the first filling grooves 51, which is close to the outer circle of the rotor along the q-axis, is the most deformable part of the rotor, and by dividing the outermost first filling groove 51 into multiple q-axis filling grooves 511, deformation of the rotor in this area can be reduced.

[0086] In some embodiments, the width of the rib 9 in the d-axis direction between any two adjacent q-axis filling grooves 511 is L3, where L3 must satisfy L3 > 0.1M1, L3 > 0.1M2, L3 > 0.05(M1 + M2), and M1 and M2 are the maximum widths in the d-axis direction of the two adjacent q-axis filling grooves 511. By limiting the maximum width of the q-axis filling grooves 511 in the d-axis direction, the rotor Outermost filling layer and This reduces the channel saturation rate between the outer magnetic barrier layers, which helps reduce motor harmonics, torque ripple, harmonic losses, and improve motor efficiency and operational stability. At the same time, by limiting the width of the ribs 9 between each q-axis filling groove 511, the outermost layer of the rotor... filling This ensures sufficient load-bearing area for the layers, further enhances the mechanical strength of the rotor, reduces rotor deformation during manufacturing, and alleviates process difficulties.

[0087] In some embodiments, the sum of the widths of the ribs 9 in the d-axis direction between any two adjacent q-axis filling grooves 511 is

number

[0088] In some embodiments, the difference in width between each rib 9 is within ±20%, and the minimum width L3 of each rib 9 must satisfy L3≧σ, where σ is the width of the air gap between the inner wall of the stator's inner circle and the rotor's outer circle, the outermost layer filling This reduces local deformation of the rotor within the layer.

[0089] In some embodiments, the widths in the d-axis direction of different parts of the same rib 9 may be equal or unequal, i.e., the shape of the rib 9 is not limited to a rectangle, trapezoid, or arc. Within the same rib 9, the width in the d-axis direction can be set larger for parts with a high risk of local deformation and smaller for parts with a low risk of local deformation.

[0090] In some embodiments, the difference in cross-sectional area of ​​each q-axis filling groove 511 is within ±30%. In some embodiments, the difference in cross-sectional area of ​​each q-axis filling groove 511 is within ±15%. This setting ensures that there is no large difference in the pressure-receiving area at each point in the outermost filling layer, thereby avoiding local deformation.

[0091] In some embodiments, the angle α1 of the line connecting both ends of the first filling groove 51 and the center of the rotor must satisfy 20° ≤ α1 ≤ 60°. In some embodiments, α1 must satisfy 30° ≤ α1 ≤ 50°. In some embodiments, α1 must satisfy 30° ≤ α1 ≤ 35°. With this setting, the filling groove forms a magnetic barrier layer, which can function as a magnetic barrier layer to increase the reluctance torque of the motor, and can also function as a starter cage to improve the starting performance of the motor.

[0092] In some embodiments, the filling grooves include a first filling groove 51 and a second filling groove 52, and their extending direction is substantially parallel to the d-axis, with an angular deviation of 5% or less, thereby forming a smooth magnetic conduction channel between them and adjacent magnetic barrier layers.

[0093] In some embodiments, the width of the first filling groove 51 in the d-axis direction is smaller than the width in the d-axis direction between the ends of the two second filling grooves 52 in the adjacent magnetic barrier layer that are closer to the rotor groove 6. The purpose of this setting is to limit the width of the first filling groove 51 in the d-axis direction, thereby preventing the rotor from deforming toward the shaft hole 7 side or the outer circle side due to an excessive width.

[0094] In some embodiments, the ratio of the distance k12 from the inner 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. If k12 / Rr is too small, the outermost magnetic conduction channel becomes too narrow, increasing the losses of the motor and reducing the efficiency. If k12 / Rr is too large, the distance between the first filling groove 51 and the outer circle of the rotor becomes too small, increasing the processing difficulty. By having the ratio of the distance on the q-axis of the side close to the shaft hole 7 of the innermost two magnetic barrier layers close to the shaft hole 7 to the width on the q-axis of the rotating shaft be greater than 1.2, the width of the magnetic conduction channel between the innermost magnetic barrier layer and the rotating shaft can be ensured, the saturation rate of the magnetic flux density of the rotor can be reduced, and the mechanical strength of the part of the rotor close to the rotating shaft can be increased. By having the ratio of the diameter of the arc portion of the side close to the shaft hole 7 of the innermost magnetic barrier layer close to the shaft hole 7 to the width on the q-axis of the rotating shaft be greater than 2, the space of the rotor can be reasonably utilized to arrange the magnetic barrier layer.

[0095] In some embodiments, the maximum thickness of the first filling groove 51 in the q-axis direction is k, the maximum thickness of the second filling groove 52 in the q-axis direction in the adjacent magnetic barrier layer is k1, and the minimum thickness of the magnetic conduction channel connected thereto in the q-axis direction is k2, and 1 < k / k1 ≤ 2, 0.8 < k / k2 ≤ 1.6. This not only ensures the thickness of the first filling groove 51 in the q-axis direction to reduce the processing difficulty, but also ensures the width of the outermost magnetic conduction channel to improve the performance of the motor.

[0096] In some embodiments, the distance between the filling groove of the innermost magnetic barrier layer close to the shaft hole 7 and the outer circle of the rotor along the q-axis is h3, the distance between the outermost filling layer close to the outer circle side of the rotor and the outer circle of the rotor is h4, h4 ≥ h3, and 0 ≤ h3 ≤ 2.5σ, where σ is the width of the air gap between the inner wall of the inner circle of the stator and the outer circle of the rotor. Since 0 ≤ h3 ≤ 2.5σ, the filling groove is an open groove or a closed groove. If the filling groove is a closed groove, the magnetic flux leakage can be reduced by limiting the maximum interval between it and the outer circle of the rotor. Since h4 ≥ h3, the magnetic flux leakage of the inner magnetic barrier layer can be reduced, and the mechanical strength of the outer magnetic barrier layer can be ensured.

[0097] In some embodiments, the maximum width in the q-axis direction of the filling groove at the end near the outer circle of the rotor is less than or equal to the maximum width in the q-axis direction of the region of the filling groove near the rotor's q-axis. In some embodiments, the width of the filling groove in the q-axis direction is approximately the same from the outer circle of the rotor to the rotor's q-axis, with a width deviation of 5% or less, ensuring a width of the magnetic conduction channel close to the air gap between the rotor's magnetic barrier layers and reducing the rotor's saturation rate. Setting the width of the filling groove in the q-axis direction to be approximately the same ensures a width of the magnetic conduction channel close to the air gap and increases the area of ​​the filling groove, which helps improve starting.

[0098] In some embodiments, the motor rotor includes at least five types of filling grooves with different cross-sectional areas, and the total cross-sectional area of ​​the filling grooves (including the first filling groove 51 and the second filling groove 52) must account for 30% to 70% of the total flow area of ​​the rotor (the sum of the cross-sectional areas of the first filling groove 51, the second filling groove 52, and the rotor groove 6). In some embodiments, this ratio is 35% to 50%. Ensuring a certain proportion of the cross-sectional area of ​​the filling grooves allows the motor to have the ability to start under a certain load.

[0099] In some embodiments, the ratio τ of the maximum and minimum thickness of all filling grooves in the q-axis direction satisfies 1 ≤ τ ≤ 2. In some embodiments, it is 1.3 ≤ τ ≤ 1.5. Limiting this ratio prevents the filling groove thickness in the q-axis direction from being too thick, which would result in a narrower width of the magnetic conduction channel and further affect efficiency, while also preventing the filling groove thickness in the q-axis direction from being too thin, which would result in a narrower cross-sectional area of ​​the filling groove and further affect starting.

[0100] In some embodiments, the width of each second filling groove 52 in the d-axis direction increases substantially gradually in the direction from the outer circle of the q-axis rotor toward the shaft hole. In some embodiments, the maximum width of each second filling groove 52 in the d-axis direction increases continuously for at least three layers in the direction from the outer circle of the q-axis rotor toward the shaft hole. In some embodiments, the maximum width of each second filling groove 52 in the d-axis direction decreases continuously from the second magnetic barrier layer closer to the d-axis to the magnetic barrier layer closer to the outer circle side of the rotor in the direction from the shaft hole of the q-axis rotor toward the outer circle. By setting it in this way, it is possible to rationally utilize the rotor space, secure an appropriate cross-sectional area of ​​the aluminum casting, and improve the starting ability of the motor.

[0101] In some embodiments, the filling grooves include a first filling groove 51 and a second filling groove 52, and at least some of the filling grooves are filled with a conductive nonmagnetic material. The filling grooves are self-short-circuited via end rings 3 at both ends of the second rotor punching plate, forming a cage structure, the material of the end rings 3 being the same as the material filled in the filling grooves. The self-short-circuited cage structure provides asynchronous torque during the motor starting phase, enabling the motor to self-start, and the multiple magnetic barrier layers provide reluctance torque to the motor, enabling synchronous operation of the motor.

[0102] In some embodiments, the rotor groove 6 is composed of arc portions and / or straight portions, and the radius of curvature of the arc portions of the rotor groove 6 gradually increases from the rotor shaft hole 7 to the outer circle side of the rotor, and the radius of curvature of the outer arc of the rotor groove 6 in the same layer is larger than the radius of curvature of the inner arc, the arc portions protrude outward toward the shaft hole 7, or both ends of the rotor groove 6 extend in the d-axis direction to become straight portions, and both ends of part or all of the rotor groove 6 are parallel to the d-axis, and the width of the rotor groove 6 gradually increases from the center position (q-axis position) to both ends (d-axis direction). The shaft hole 7 is opened in the center of the rotor, and with this arrangement, the utilization rate of the rotor space is increased, the rotor groove 6 can be rationally arranged, the salient pole ratio of the rotor is increased, and the reluctance torque of the motor is improved.

[0103] In some embodiments, the length of the curve between the ends of the rotor grooves 6 in each layer near the two second filling grooves 52 gradually decreases from the rotor shaft hole 7 toward the outer circle of the rotor, with the rate of decrease in the length of the curve of adjacent rotor grooves 6 being 5% to 25%. The shaft hole 7 is located in the center of the rotor. ru. The purpose of this configuration is to improve motor performance by ensuring a certain proportion of the magnetic barrier layer while making rational use of the rotor space.

[0104] In some embodiments, the maximum width of the shaft hole 7 in the q-axis direction is less than or equal to the maximum width of the shaft hole 7 in the d-axis direction. A rotor groove 6 is provided in the q-axis direction, and this arrangement increases the utilization rate of the rotor space, allows for a rational arrangement of the rotor groove 6, increases the salient pole ratio of the rotor, and improves the reluctance torque of the motor.

[0105] In some embodiments, the cross-sectional shape of the shaft hole 7 consists of an arc portion and / or a straight portion, that is, the shape of the shaft hole 7 is not limited to circular, elliptical, substantially elliptical, or square, and the shape of the shaft hole 7 can be flexibly selected according to the arrangement of the rotor groove 6.

[0106] Balance blocks are attached to the end rings 3 at both ends of the rotor, and the balance blocks are positioned on the side with the larger radial width between the inner bore edge and the outer circle of the end ring 3.

[0107] The present invention provides a self-starting synchronous reluctance motor rotor that enables the motor to start automatically by asynchronous torque provided by the rotor bar (i.e., a member formed by filling grooves), solving the problem that synchronous reluctance motors need to be driven by an inverter, reducing motor losses, improving motor efficiency, and the motor rotor can reduce motor harmonics, reduce torque ripple, reduce harmonic losses, improve motor efficiency and operational stability, increase the airflow area of ​​the rotor, and accelerate heat dissipation of the rotor.

[0108] In this invention, the length, width, thickness, diameter, etc., of the rotor core structure may preferably be expressed in millimeters, but it should be understood that other appropriate units may be selected and used where reasonable.

[0109] According to embodiments of the present invention, a self-starting synchronous reluctance motor, in particular a self-starting synchronous reluctance two-pole motor, is provided, comprising the above-mentioned motor rotor, wherein the load inertia connected to the output end of the motor shaft is less than 60% of the system inertia of the motor's own rotating shaft.

[0110] According to embodiments of the present invention, a compressor including the above-described self-starting synchronous reluctance motor is further provided.

[0111] Those skilled in the art will readily understand that, insofar as there is no contradiction, the above advantageous forms can be freely combined or superimposed.

[0112] The above are merely some embodiments of the present invention and do not limit it. Any modifications, equivalent substitutions, or improvements made without departing from the spirit and principles of the present invention should be considered within the scope of protection of the present invention. The above are merely some embodiments of the present invention, and it should be noted that those skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. [Explanation of symbols]

[0113] 2. Second rotor punching plate 21, communication groove 3. End ring 4. First rotor punching plate 51. First filling groove 511, q-axis filling groove 52. Second filling groove 6. Rotor groove 7. Shaft hole 8. Divided ribs 9. Rib

Claims

1. A motor rotor including a rotor core, wherein the rotor core includes a first rotor punched plate (4), an end ring (3), and a second rotor punched plate (2). The first rotor punching plate (4) has a filling groove, a rotor groove (6), and a shaft hole (7), the filling groove includes a second filling groove (52) and a first filling groove (51), the first rotor punching plate (4) has two outer filling layers provided along the q axis near the outer circle of the rotor, each outer filling layer includes a first filling groove (51), and between the two outer filling layers, multiple magnetic barrier layers are provided at intervals along the q axis, each of the multiple magnetic barrier layers includes one rotor groove (6) and two second filling grooves (52) located at both ends of the rotor groove (6), and in the same magnetic barrier layer, there is a dividing rib (8) between the second filling groove (52) and the rotor groove (6). The second rotor punching plate (2) is provided between the end ring (3) and the first rotor punching plate (4), and the second rotor punching plate (2) is provided with a communication groove (21) corresponding to the filling groove of the first rotor punching plate (4), and the total cross-sectional area of ​​the first portion of the rotor groove (6) located between the inner hole edge and the outer circle of the second rotor punching plate (2) in the first rotor punching plate (4) is smaller than the total cross-sectional area of ​​the rotor groove (6) in the first rotor punching plate (4). A motor rotor characterized in that the maximum thickness in the q-axis direction of the first filling groove (51) is k, the maximum thickness in the q-axis direction of the second filling groove (52) in the magnetic barrier layer adjacent thereto is k1, and the minimum thickness in the q-axis direction of the magnetic conduction channel connected thereto is k2, with 1 < k / k1 ≤ 2 and 0.8 < k / k2 ≤ 1.

6.

2. The motor rotor according to claim 1, characterized in that, in the first rotor punching plate (4), the total cross-sectional area of ​​the second portion of the rotor groove (6) located within the inner bore of the second rotor punching plate (2) accounts for at least 30% of the total cross-sectional area of ​​the rotor groove (6), and / or, the maximum width of the outer contour of the second rotor punching plate (2) is less than or equal to the diameter of the outer circle of the first rotor punching plate (4), and / or, the maximum width of the inner bore of the second rotor punching plate (2) in the q-axis is greater than or equal to the maximum width in the d-axis.

3. The motor rotor according to claim 1, characterized in that at least two of the lines connecting the center of the rotor core and points at different positions on the inner hole edge of the second rotor punched plate (2) are not of equal length.

4. The motor rotor according to claim 1, characterized in that the ratio of the maximum width of the inner bore of the second rotor punching plate (2) in the q-axis direction to the maximum width in the d-axis direction is 1 to 1.5, and / or the thickness of the second rotor punching plate (2) in the direction of the rotation axis direction is greater than or equal to the thickness of one of the first rotor punching plates (4).

5. The motor rotor according to claim 1, characterized in that the total cross-sectional area of ​​the communication grooves (21) in the second rotor punching plate (2) is less than or equal to the total cross-sectional area of ​​the filling grooves provided in the first rotor punching plate (4), and / or, at the same location, the cross-sectional area of ​​a single communication groove (21) in the second rotor punching plate (2) is less than or equal to the cross-sectional area of ​​a single filling groove in the first rotor punching plate (4).

6. The width in the d-axis direction between the inner hole of the second rotor punching plate (2) and the communication groove (21) is greater than the width of the dividing rib (8) between the communication groove (21) and the rotor groove (6). The motor rotor according to claim 1, characterized in that and / or, the radial width between the inner hole edge and the outer circle of the second rotor punching plate (2) is not equal depending on the position, and the radial width kd1 of the second rotor punching plate (2) in the d axis and the radial width kq1 of the second rotor punching plate (2) in the q axis satisfy 1.1 ≤ kd1 / kq1 ≤ 2.

8.

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

4.

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

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

10. The motor rotor according to claim 1, characterized in that, in the direction from the outer circle of the q-axis rotor toward the shaft hole, the width of each second filling groove (52) in the d-axis direction gradually increases.

11. The motor rotor according to claim 1, characterized in that a conductive nonmagnetic material is filled in at least a portion of the first filling groove (51) and the second filling groove (52), and the filling grooves are self-short-circuited via end rings (3) at both ends of the second rotor punching plate to form a cage structure.

12. The motor rotor according to claim 1, characterized in that the minimum distance h1 in the q-axis direction of the magnetic conduction channel between two adjacent magnetic barrier layers satisfies h1 ≥ 1.5h2, where h2 is the minimum width in the q-axis direction of the magnetic barrier layer with the smaller width in the q-axis direction among the two adjacent magnetic barrier layers, and / or a magnetic conduction channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic conduction channel in the q-axis direction gradually decreases in the direction from the q-axis axial hole toward the outer circle of the rotor.

13. A self-starting synchronous reluctance motor, characterized in that it includes a stator and a motor rotor according to any one of claims 1 to 12.

14. A compressor, characterized in that it includes the self-starting synchronous reluctance motor described in claim 13.

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