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 relates to the technical field of motor design, and more particularly to motor rotors and their self-starting synchronous reluctance motors and compressors.

[0002] This application claims priority to a Chinese patent application filed with the China Patent Office on January 26, 2022, bearing application number 202210092227.8 and entitled "Motor Rotor, Self-Starting Synchronous Reluctance Motor and Compressor Thereof," the entire contents of which are incorporated herein by reference. [Background technology]

[0003] Self-starting synchronous reluctance motors are based on synchronous reluctance motors and combine the advantages of asynchronous motors, which can achieve self-starting by the asynchronous torque generated by the rotor bars, and do not need to be driven by an inverter. Compared with asynchronous motors, the motor can run at a constant speed, has lower rotor losses, and is more efficient during synchronous operation. Compared with asynchronous starting permanent magnet synchronous motors, the motor does not use permanent magnet materials, so it is less expensive and does not have the problem of demagnetization of the permanent magnets. However, due to the multiple magnetic barrier layers of the self-starting synchronous reluctance motor, the motor has the problem of difficulty in heat dissipation. Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, the present invention provides a motor rotor, a self-starting synchronous reluctance motor, and a compressor thereof, which can eliminate the defect that the motor rotor of the self-starting synchronous reluctance motor in the prior art has multiple magnetic barrier layers, making it difficult to dissipate heat from the motor. [Means for solving the problem]

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

[0006] In some embodiments, the total cross-sectional area of ​​the rotor grooves in the first rotor punching plate located within the inner hole of the second rotor punching plate 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, of the lines connecting the center of the rotor core and points at different positions on the edge of the inner hole of the second rotor punching plate, at least two of the lines have unequal lengths.

[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 between 1 and 1.5.

[0009] In some embodiments, the axial thickness of the second rotor blank is greater than or equal to the thickness of one of the first rotor blanks.

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

[0011] In some embodiments, the positions of the communicating grooves in the second rotor punching plate and the filling grooves in the first rotor punching plate correspond to the same positions, and at the same positions, the cross-sectional area of ​​a single communicating groove in the second rotor punching plate is less than or equal to the cross-sectional area of ​​a single filling groove in the first rotor punching plate.

[0012] In some embodiments, the width in the d-axis direction between the inner hole of the second rotor punching plate and the communicating groove must be greater than the width of the dividing rib between the communicating 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 of the second rotor punching plate on the d axis and the radial width kq1 of the second rotor punching plate on the q axis satisfy 1.1≦kd1 / kq1≦2.8.

[0014] In some embodiments, the total cross-sectional area of ​​the rotor grooves in the first rotor punch that are located within the bore of the second rotor punch comprises 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, in the first rotor punching plate, the cross-sectional area of ​​the rotor groove located within the inner hole of the second rotor punching plate in each layer of magnetic barrier layer gradually decreases.

[0016] In some embodiments, the maximum width of the outer contour of the end rings 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 rings 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 on the d-axis and k10 on the q-axis, where 1.1≦k9 / k10≦2.8.

[0018] In some embodiments, the center point is located on an axial plane where the side edge of the dividing rib closer to the outer circle of the rotor is located, the distance in the d-axis direction between two such center points corresponding to two dividing ribs in any two adjacent magnetic barrier layers is L, and the maximum distance in the q-axis direction of the magnetic conductive 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 distance from the center of the dividing rib to the d-axis and the q-axis satisfies kq=-ν*kd+λ, where kq is the distance from the center of the dividing rib to the q-axis and kd is the distance from the center of the dividing rib to the d-axis, and satisfies 0.28≦ν≦0.46 and 28≦λ≦33.

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

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

[0022] In some embodiments, the minimum distance h1 in the q-axis direction of the magnetic conductive 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 having the smaller width in the q-axis direction among the two adjacent magnetic barrier layers.

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

[0024] In some embodiments, in the direction from the axial hole of the q-axis toward the outer circle of the rotor, the width of each magnetic conductive channel on the q-axis decreases successively for at least three layers, and / or a magnetic conductive channel is formed between two adjacent magnetic barrier layers, and the width of the magnetic conductive channel gradually increases from the q-axis to both sides of the q-axis for a magnetic conductive channel consisting of an arc portion and a straight portion.

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

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

[0027] In some embodiments, in the outer magnetic barrier layer close to the outer circle of the rotor along the q axis, the width in the d-axis direction between the ends of two second filling grooves located at both ends of the rotor groove close to the rotor groove is k3, and in the inner magnetic barrier layer adjacent thereto and close to the shaft hole, the width in the d-axis direction between the ends of two second filling grooves located at both ends of the rotor groove close to the rotor groove is k4, where 0.5≦k3 / k4≦1, or 0.5≦k4 / k3≦1.

[0028] In some embodiments, in the outermost magnetic barrier layer closest to 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 closest to the rotor groove is k5, and in the innermost magnetic barrier layer close to the rotor shaft hole, the width in the d-axis direction between the ends of the two second filling grooves at both ends of the rotor groove closest to the rotor groove is k6, where 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 periphery of the rotor, has a divided structure consisting of multiple q-axis filling grooves, and a rib is provided between two adjacent q-axis filling grooves.

[0030] In some embodiments, the number of ribs in the first fill 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, or L3 > 0.05 (M1 + M2), and M1 and M2 are the maximum widths in the d-axis direction of any two adjacent q-axis filling grooves.

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

number

[0033] In some embodiments, the cross-sectional area of ​​each q-axis fill groove varies by no more than ±30%.

[0034] In some embodiments, the included angle α1 between the lines 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 in the d-axis direction of the first fill groove is smaller than the width in the d-axis direction between the ends of two second fill grooves in the magnetic barrier layer adjacent thereto 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 in the q-axis direction to the rotor radius Rr satisfies 0.82≦k12 / Rr≦0.96, and / or the ratio of the distance in the q-axis of the side closest to the axial hole of the innermost two magnetic barrier layers closest to the axial hole to the width of the rotation axis in the q-axis is greater than 1.2.

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

[0039] In some embodiments, the first filled trench has a maximum thickness in the q-axis direction of k, the second filled trench in the magnetic barrier layer adjacent thereto has a maximum thickness in the q-axis direction of k1, and the magnetic conductive channel connected thereto has a minimum thickness in the q-axis direction of 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 close to 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 close to the q-axis of the rotor.

[0041] In some embodiments, the deviation in width of the filling groove in the q-axis direction 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 filling grooves with different cross-sectional areas, and / or the total cross-sectional area of ​​the first filling groove and the second filling groove accounts for 30% to 70% of the total cross-sectional area of ​​the first filling groove, the second filling groove and the rotor groove.

[0043] In some embodiments, the ratio τ of the maximum value to the minimum value of the thickness in the q-axis direction of all the filled grooves satisfies 1≦τ≦2.

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

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

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

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

[0048] In some embodiments, a conductive non-magnetic material is filled into the grooves of at least a portion of the first and second filled grooves, and the filled grooves are self-shorted via end rings at both ends of the second rotor stamping plate to form a cage structure.

[0049] In some embodiments, the rotor groove is composed of an arc portion and / or a straight portion, and the radius of curvature of the arc portion of the rotor groove gradually increases from the axial hole side of the rotor to the outer circle side of the rotor, and the radius of curvature of the outer arc of the rotor groove of the same layer is larger than the radius of curvature of the inner arc, the arc portion protrudes in the outer circle direction toward the axial hole, or both ends of the rotor groove extend in the d-axis direction to become straight portions, and both ends of some or all of the rotor grooves are parallel to the d-axis, and the width of the rotor groove gradually increases from the central position of the rotor groove to both ends.

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

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

[0052] In some embodiments, the center point is located on an axial plane where the side edge of the dividing rib closer to the outer circle of the rotor is located, the distance in the d-axis direction between two such center points corresponding to two dividing ribs in any two adjacent magnetic barrier layers is L, and 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, which satisfies 0≦L<8σ.

[0053] In some embodiments, the width in the d-axis direction of the split rib of the outermost magnetic barrier layer close to the outer circle of the rotor along the q-axis is L1, and the width in the d-axis direction of the split rib of the innermost magnetic barrier layer close to the axial hole is L2, L1 is greater than or equal to L2 and L1≧0.5*σ, and 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.

[0054] In some embodiments, the first filling groove is located in the q-axis direction of the outer periphery of the rotor, has a divided structure consisting of multiple q-axis filling grooves, and a rib is 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 along the q axis between the filling groove of the innermost magnetic barrier layer close to the axial hole and the outer circle of the rotor is h3, the distance between the outer 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, and 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.

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

[0057] In the motor rotor, self-starting synchronous reluctance motor and compressor according to the present invention, the structural design of the second rotor punching plate can ensure that at least some of the rotor grooves are in direct contact with the air, forming circulation holes and increasing the heat dissipation of the rotor. [Brief description of the drawings]

[0058] [Figure 1] FIG. 2 is a schematic diagram of the three-dimensional structure of a motor rotor according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic axial structure diagram of a first rotor punching plate of a motor rotor according to an embodiment of the present invention; [Diagram 3] FIG. 4 is a schematic axial structure diagram of a second rotor punching plate of a motor rotor according to an embodiment of the present invention. [Figure 4] FIG. 2 is a schematic axial structure diagram of an electronic rotor according to an embodiment of the present invention; [Diagram 5] FIG. 4 is a schematic axial structure diagram of a first rotor punching plate of a motor rotor according to another embodiment of the present invention. [Figure 6] FIG. 4 is a schematic axial structure diagram of a second rotor punching plate of a motor rotor according to another embodiment of the present invention. [Figure 7] FIG. 4 is an axial structural schematic diagram of an electronic rotor according to another embodiment of the present invention; [Figure 8] FIG. 2 is a comparison diagram of temperature rise, loss and efficiency of a motor using the technical solution of the present invention and a motor in the prior art; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0059] As shown in FIGS. 1 to 8, according to an embodiment of the present invention, the present invention provides a self-starting synchronous reluctance motor rotor, which uses a special design of the rotor core to increase the area of ​​the rotor that directly contacts the air, form a flow groove, and increase the heat dissipation of the rotor.

[0060] Hereinafter, specific embodiments will be described by way of example with reference to the rotor in the drawings. FIG. 1 is a schematic diagram of a motor rotor, which includes a rotor core, which includes a first rotor punching plate 4, a second rotor punching plate 2, and an end ring 3. In some embodiments of the present application, as shown in FIG. 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 first filling groove 51 and a second filling groove 52. The first rotor punching plate 4 is provided with two outer filling layers along the q axis near the outer circle of the rotor, each outer layer 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, each of the multiple layers of magnetic barrier layers includes a rotor groove 6 and a second filling groove 52 located at both ends of the rotor groove 6, and in the same layer of magnetic barrier layer, there is a dividing 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 equal to or less than 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 equal to or greater than the maximum width in the d-axis. Of the lines connecting the center of the rotor core and different points on the edge of the inner hole of the second rotor punching plate 2, at least two lines have unequal lengths. The second rotor punching plate 2 is disposed between the end ring 3 and the first rotor punching plate 4, and the second rotor punching plate 2 is provided with a communicating groove 21 corresponding to 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 edge of the inner hole of the second rotor punching plate 2 and the outer circle is smaller than the total cross-sectional area of ​​the rotor grooves 6 in the first rotor punching plate 4. As part of the rotor, the second rotor punching plate 2 must have an outer contour smaller than the outer circle of the first rotor punching 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, in the direction of arrangement of the rotor groove 6 corresponding to the first rotor punching plate 4, the rotor groove 6 of sufficient cross-sectional area must come into direct contact with the air to form a flow hole, thereby increasing heat dissipation from the rotor. Therefore, the q-axis width must be greater than or equal to the d-axis width.Among the lines connecting the center of the rotor core and points at different positions on the edge of the inner hole of the second rotor punching plate 2, at least two of the lines are unequal in length. This restriction makes it possible to lengthen the length of the line connecting the center of the rotor and the points in the q-axis direction of the inner hole of the second rotor punching plate 2, so that more rotor grooves 6 are not blocked by the second rotor punching plate 2. The total cross-sectional area of ​​the rotor grooves 6 located between the edge of the inner hole of the second rotor punching plate 2 and the outer circle in the first rotor punching plate 4 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 the rotor grooves 6. The structural design of the second rotor punching plate 2 can ensure that at least some of the rotor grooves 6 are in direct contact with the air, forming a flow hole and increasing the heat dissipation of the rotor. Figure 8 shows a comparison diagram of the temperature rise, loss and efficiency of the motor of the technology of the present invention and the prior art. As is clear from FIG. 8, the technology of the present invention reduces the temperature rise of the motor, and further reduces the copper and aluminum consumption, thereby improving the efficiency of the motor.

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

[0063] In some embodiments, the thickness of the second rotor punching plate 2 in the stacking direction, i.e., the axial direction, of the first rotor punching plate 4 is greater than or equal to the thickness of one of the first rotor punching plates 4, thereby ensuring the mechanical strength of the rotor.

[0064] In some embodiments, the second rotor punching plate 2 is provided with a communicating groove 21, and the total cross-sectional area of ​​the communicating grooves 21 in the second rotor punching plate 2 is equal to or less than the total cross-sectional area of ​​the filling grooves provided in the first rotor punching plate 4. The communicating grooves 21 in the second rotor punching plate 2 are inlets for filling the filling grooves in the first rotor punching plate 4 with material. By providing the communicating grooves 21 in the second rotor punching plate 2, the filling material can enter the filling grooves in the first rotor punching plate 4, and by ensuring that the total cross-sectional area of ​​the communicating grooves 21 in the second rotor punching plate 2 is equal to or less than the total cross-sectional area of ​​the filling grooves provided in the first rotor punching plate 4, the force-receiving area of ​​the non-filling groove portion of the first rotor punching plate 4 can be reduced when filling the material, and the mechanical strength during the material filling can be ensured, thereby reducing the amount of deformation.

[0065] In some embodiments, the positions of the communicating grooves 21 provided in the second rotor punching plate 2 and the filling grooves provided in the first rotor punching plate 4 correspond to each other and are the same, and at the same position, the cross-sectional area of ​​a single communicating 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 the material.

[0066] In some embodiments, the width in the d-axis direction between the inner hole of the second rotor punching plate 2 and the communicating groove 21 must be greater than the width of the dividing rib 8 between the communicating groove 21 and the rotor groove 6, thereby ensuring that nothing is filled in the rotor groove 6 during 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 two points where the line connecting the center of the rotor and the outer circle of the rotor intersects with 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 on the d axis and the radial width kq1 of the second rotor punching plate 2 on the q axis satisfy 1.1≦kd1 / kq1≦2.8, and in some embodiments, 1.2≦kd1 / kq1≦1.8, thereby ensuring that sufficient rotor grooves 6 in the first rotor punching plate 4 are located within the inner hole of the second rotor punching plate 2.

[0068] In some embodiments, the total cross-sectional area of ​​the rotor grooves 6 in the first rotor punching plate 4 located in the inner hole of the second rotor punching plate 2 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, the ratio is 25%-40%, ensuring that a sufficient area of ​​the rotor grooves 6 directly contacts the air to form flow holes and increase the heat dissipation of the rotor.

[0069] In some embodiments, in the direction from the rotor shaft hole 7 to the rotor outer circle along the q axis, in the first rotor punching plate 4, the cross-sectional area of ​​the rotor groove 6 located in the inner hole of the second rotor punching plate 2 in each layer of magnetic barrier layer gradually decreases. The end rings 3 have a constant thickness in the q axis direction in the outermost magnetic barrier layer close to the rotor outer circle along the q axis, which can ensure a constant volume of the end rings 3 and improve the starting ability of the motor.

[0070] In some embodiments, the maximum width of the outer contour of the end ring 3 is equal to or less than 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 equal to or greater than the maximum distance from the center of the rotor core to the end face of the second rotor punching plate 2. By having the maximum width of the outer contour of the end ring 3 equal to or less than the maximum width of the outer contour of the second rotor punching plate 2, it is possible to ensure 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 filling of the material, thereby reducing local deformation, and by having the maximum distance from the center of the first rotor punching plate 4 to the end face of the end ring 3 equal to or greater than the maximum distance from the center of the first rotor punching plate 4 to the end face of the second rotor punching plate 2, it is possible to ensure that the rotor has an end ring 3 with a certain volume, which is helpful in improving the starting ability of the motor.

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

[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 closer to the outer circle of the rotor of the dividing rib 8 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] It should be noted that the above center point is the geometric center point of the axial plane where the side closer to the outer circle of the rotor of the dividing rib 8 is located. As a specific embodiment, as shown in FIG. 2, the above plane is a parallelogram plane extending in the axial direction of the first rotor punching plate 4, and the geometric center point of this parallelogram plane, that is, the intersection point of its diagonals, projects in the axial direction of the first rotor punching plate 4 to be the midpoint of the side closer to the outer circle of the rotor of the dividing rib 8.

[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 examples, 0 ≤ L ≤ 6σ. The split 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 split 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 split rib 8 in the d-axis direction of the outermost magnetic barrier layer close to the outer circle of the rotor along the q-axis is L1, and the width of the split rib 8 in the d-axis direction of the innermost magnetic barrier layer close to the shaft hole 7 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 split rib 8, the difficulty of processing can be reduced, the mechanical strength of the rotor can be increased, L1 ≥ L2, the magnetic flux leakage of the inner magnetic barrier layer can be reduced, and the efficiency of the motor can be improved.

[0076] In some embodiments, the plane where the side surface of the split rib 8 is located is parallel to or intersects with the plane where the q-axis is located and along the axial direction of the rotor, that is, the shape of the split rib 8 is not limited to a rectangle, a trapezoid, or an arc shape. The shape of the split rib 8 can be flexibly selected according to the direction of the magnetic force lines to reduce the magnetic flux leakage of the motor.

[0077] In some embodiments, in the first quadrant composed of the d-axis and the q-axis, the distances from the center of the split rib 8 to the d-axis and the q-axis satisfy kq = -ν * kd + λ, where kq is the distance from the center of the split rib 8 to the q-axis, kd is the distance from the center of the split rib 8 to the d-axis, the coefficient ν (dimensionless) satisfies 0.28 ≤ ν ≤ 0.46, and the coefficient λ (dimension consistent with kq and kd) satisfies 28 ≤ λ ≤ 33. By limiting the position and width of the split rib 8, the risk of deformation of the rotor can be reduced.

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

number

number

[0079] In some embodiments, the minimum width W1 of the magnetic conductive channel between two adjacent filling grooves must satisfy W1≧d, where d is the minimum width of the magnetic conductive channel formed between the rotor grooves 6 corresponding to the two filling grooves, and in some embodiments W1 / d>1.15, in order to ensure a sufficient width between the filling grooves 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 conductive 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 that has the smaller width in the q-axis direction among the two adjacent magnetic barrier layers. This setting can reduce the difficulty in processing the rotor and ensure the uniformity and unsaturation of the magnetic flux density distribution of the rotor.

[0081] In some embodiments, a magnetic conductive channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic conductive channel in the q-axis direction is gradually decreased in the direction from the q-axis hole toward the outer circle of the rotor, and in some embodiments, the width of each magnetic conductive channel in the q-axis direction is gradually decreased for at least three consecutive layers in the direction from the q-axis hole toward the outer circle of the rotor. The closer the magnetic conductive channel is to the axial hole 7, the greater the interaction with the stator and the greater the impact on the performance of the motor. This setting ensures the width of the magnetic conductive channel close to the axial hole 7 while making rational use of the rotor space, which is helpful in improving the performance of the motor. A magnetic conductive channel is formed between two adjacent magnetic barrier layers, and the width of the magnetic conductive channel (the width of the magnetic conductive channel is defined as the shortest distance from each point on one side of the two sides of the magnetic conductive channel to the other side) gradually increases from the q-axis to both sides of the q-axis for a magnetic conductive channel consisting of an arc portion and a straight portion. The width of the magnetic conductive channel defined here is the cross-sectional width through which the magnetic field lines in the rotor pass, and this setting helps to reduce the saturation rate of the magnetic flux density in the rotor and reduce motor losses.

[0082] In some embodiments, in each layer of 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 close to the filling groove is τ1, and τ1 gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer. Not only does it ensure the width of the magnetic conductive channel between the magnetic barrier layers of the inner layers, but it also ensures a constant ratio of the magnetic barrier layer, and improves the performance of the motor. In each layer of 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. In some embodiments, 1.5<τ2<3.0. By limiting the ratio, it is possible to ensure a constant width of the filling groove and increase its arrangement area, and by limiting the range of the ratio, it is also possible to ensure the width of the magnetic conductive channel between the filling grooves.

[0083] In some embodiments, in the outer magnetic barrier layer close to 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 close to the rotor groove 6 is k3, and in the inner magnetic barrier layer adjacent thereto and close 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 close to the rotor groove 6 is k4, where 0.5≦k3 / k4≦1 or 0.5≦k4 / k3≦1. When the space on the rotor is limited, this setting can increase the area of ​​the filling grooves and improve the starting ability of the motor.

[0084] In some embodiments, in the outermost magnetic barrier layer close to 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 close to the rotor groove 6 is k5, and in the innermost magnetic barrier layer close to the rotor 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 close to the rotor groove 6 is k6, where 0.5≦k5 / k6≦1 or 0.5≦k6 / k5≦1. When the rotor space is limited, this setting can increase the area of ​​the filling grooves and improve the starting ability of the motor.

[0085] In some embodiments, the first filling groove 51 is located in the q-axis direction of the outer periphery of the rotor, has a divided structure consisting of multiple q-axis filling grooves 511, and a rib 9 is 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 part of the rotor that is most susceptible to deformation, and by dividing the outermost first filling groove 51 into multiple q-axis filling grooves 511, the deformation of the rotor here can be reduced.

[0086] In some embodiments, the width of the rib 9 between any two adjacent q-axis filling grooves 511 in the d-axis direction is L3, and L3 must satisfy L3>0.1M1, L3>0.1M2, L3>0.05(M1+M2), where M1 and M2 are the maximum widths of any two adjacent q-axis filling grooves 511 in the d-axis direction. Limiting the maximum width of the q-axis filling groove 511 in the d-axis direction can reduce the saturation rate of the channel between the outer magnetic barrier layers of the rotor, which is helpful in reducing the harmonics of the motor, reducing the torque ripple, reducing the harmonic loss, and improving the efficiency and operation stability of the motor. At the same time, limiting the width of the rib 9 between each q-axis filling groove 511 can ensure the force-receiving area of ​​the outermost magnetic barrier layer of the rotor, which further enhances the mechanical strength of the rotor, reduces the deformation of the rotor during manufacturing, and reduces the process difficulty.

[0087] In some embodiments, the sum of the widths of the ribs 9 between any two adjacent q-axis filling grooves 511 in the d-axis direction 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 inner circle of the stator and the outer circle of the rotor, thereby reducing local deformation of the rotor at the outermost magnetic barrier layer.

[0089] In some embodiments, the widths in the d-axis direction of different portions of the same rib 9 may be equal or unequal, i.e., the shape of the rib 9 is not limited to a rectangle, a trapezoid, or an arc. In the same rib 9, the width in the d-axis direction of a portion having a high risk of local deformation may be set to be large, and the width in the d-axis direction of a portion having a low risk of local deformation may be set to be small.

[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 of ​​each point of the outermost filling layer, and avoids local deformation.

[0091] In some embodiments, the included angle α1 between the lines 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 and functions as a magnetic barrier layer to increase the reluctance torque of the motor, and also functions as a starting 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 extension direction is approximately parallel to the d-axis with an angular deviation of 5% or less, thereby forming a smooth magnetic conductive channel between adjacent magnetic barrier layers.

[0093] In some embodiments, the width in the d-axis direction of the first filling groove 51 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 in the d-axis direction of the first filling groove 51, thereby preventing the rotor from being deformed toward the shaft hole 7 or the outer circle side due to the width being too large.

[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 decreasing 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 difficulty of processing. 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 decreased, and the mechanical strength of the portion 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 magnetic barrier layer can be arranged by reasonably utilizing the space of the rotor.

[0095] In some embodiments, 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 adjacent magnetic barrier layer is k1, and the minimum thickness in the q-axis direction of the magnetic conduction channel connected thereto 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 and reduces the difficulty of processing, but also ensures the width of the outermost magnetic conduction channel and improves 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, and 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 of the filling groove in the q-axis direction at the end close to the rotor's outer circle side is equal to or less than the maximum width of the filling groove in the q-axis direction at the region close to the rotor's q-axis. In some embodiments, the width of the filling groove in the q-axis direction is substantially the same from the rotor's outer circle side to the rotor's q-axis, with a width deviation of 5% or less, ensuring the width of the magnetic conductive channel close to the air gap between the magnetic barrier layers of the rotor and reducing the saturation rate of the rotor. By setting the width of the filling groove in the q-axis direction to be substantially the same, the width of the magnetic conductive channel close to the air gap can be ensured and the area of ​​the filling groove can be increased, which is useful for improving 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) should 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, the percentage is 35% to 50%. A constant percentage of the cross-sectional area of ​​the filling grooves can be ensured to give the motor the ability to start under a constant load.

[0099] In some embodiments, the ratio τ of the maximum to minimum thicknesses of all the filling grooves in the q-axis direction satisfies 1≦τ≦2. In some embodiments, 1.3≦τ≦1.5. By limiting this ratio, the thickness of the filling grooves in the q-axis direction is not too thick, which would result in a too small width of the magnetic conductive channel and thus affect efficiency, while the thickness of the filling grooves in the q-axis direction is not too thin, which would result in a too small cross-sectional area of ​​the filling groove and thus affect starting.

[0100] In some embodiments, the width of each second filling groove 52 in the d-axis direction increases gradually from the outer circle of the rotor on the q-axis 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 rotor on the q-axis 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 close to the d-axis to the magnetic barrier layer close to the outer circle of the rotor in the direction from the shaft hole of the q-axis toward the outer circle of the rotor. By setting in this way, it is possible to ensure an appropriate cross-sectional area of ​​the aluminum casting while rationally utilizing the space of the rotor, 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, at least some of the filling grooves are filled with a conductive non-magnetic material, the filling grooves are self-shorted via the end rings 3 at both ends of the second rotor punching plate to form a squirrel cage structure, and the material of the end rings 3 is the same as the material filled in the filling grooves. The self-shorted squirrel cage structure provides asynchronous torque during the starting phase of the motor to realize self-starting of the motor, and the multiple magnetic barrier layers provide reluctance torque to the motor to realize synchronous operation of the motor.

[0102] In some embodiments, the rotor groove 6 is composed of an arc portion and / or a straight portion, and the radius of curvature of the arc portion of the rotor groove 6 gradually increases from the shaft hole 7 of the rotor to the outer circle side of the rotor, and the radius of curvature of the outer arc of the rotor groove 6 of the same layer is larger than the radius of curvature of the inner arc, the arc portion protrudes toward the shaft hole 7 in the outer circle direction, or both ends of the rotor groove 6 extend in the d-axis direction to form straight portions, and some or all of both ends 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) of the rotor groove 6 to both ends (d-axis direction). The shaft hole 7 is opened in the center of the rotor, and this arrangement can improve the utilization rate of the rotor space and rationally arrange the rotor groove 6, increasing the salient pole ratio of the rotor, thereby improving the reluctance torque of the motor.

[0103] In some embodiments, from the rotor axial hole 7 toward the outer circle of the rotor, the length of the curve between the ends of the rotor grooves 6 close to the two second filling grooves 52 of each layer gradually decreases, and the decrease rate of the length of the curve between adjacent rotor grooves 6 is 5% to 25%. The axial hole 7 is provided in the center of the rotor, and the purpose of this setting is to ensure a certain proportion of the magnetic barrier layer while rationally utilizing the rotor space, thereby improving the performance of the motor.

[0104] In some embodiments, the maximum width of the shaft hole 7 in the q-axis direction is equal to or less than the maximum width of the shaft hole 7 in the d-axis direction. The rotor grooves 6 are provided in the q-axis direction, and this arrangement can improve the utilization rate of the rotor space, rationally arrange the rotor grooves 6, increase the salient pole ratio of the rotor, and improve the reluctance torque of the motor.

[0105] In some embodiments, the cross-sectional shape of the shaft hole 7 is composed of arc portions and / or straight portions, i.e., the shape of the shaft hole 7 is not limited to circular, elliptical, approximately elliptical, or rectangular, 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 located on the side with the larger radial width between the inner hole edge and the outer circle of the end ring 3.

[0107] The present invention provides a self-starting synchronous reluctance motor rotor, which realizes the self-starting of the motor by the asynchronous torque provided by the rotor bar (i.e., the part formed by filling the filling groove), solves the problem that the synchronous reluctance motor needs to be driven by an inverter, reduces the motor loss, and improves the motor efficiency; the motor rotor can reduce the motor harmonics, reduce the torque ripple, reduce the harmonic loss, improve the motor efficiency and operation stability, increase the air flow area of ​​the rotor, and accelerate the heat dissipation of the rotor.

[0108] The length, width, thickness, diameter, etc. of the rotor core related structures in the present invention may preferably be in mm, although it will be understood that other suitable units may be selected and used where reasonable.

[0109] According to an embodiment of the present invention, there is further provided a self-starting synchronous reluctance motor, particularly a self-starting synchronous reluctance two-pole motor, which includes the above motor rotor, and the load inertia connected to the output end of the motor shaft is less than 60% of the system inertia of the rotating shaft of the motor itself.

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

[0111] A person skilled in the art can easily understand that the above advantageous aspects can be freely combined or superimposed, unless there is a contradiction.

[0112] The above are only some examples of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and principles of the present invention should be included within the scope of protection of the present invention. Please note that the above are only some embodiments of the present invention, and those skilled in the art can make some improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered as 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. Split rib 9. Ribs

Claims

1. A motor rotor including a rotor core, the rotor core including 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 an axial hole (7), and 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 arranged along the q axis near the outer circle of the rotor, each outer layer filling layer including a first filling groove (51). Between the two outer filling layers, multiple layers of magnetic barrier layers are arranged at intervals along the q axis, and each of the multiple layers of magnetic barrier layers includes a rotor groove (6) and a second filling groove (52) located at both ends of the rotor groove (6). In the same layer of magnetic barrier layer, there is a dividing rib (8) between the second filling groove (52) and the rotor groove (6). a rotor groove (6) in the first rotor punching plate (4) located between an end ring (3) and the first rotor punching plate (4), the second rotor punching plate (2) having a communicating groove (21) corresponding to the filling groove of the first rotor punching plate (4), and a total cross-sectional area of ​​the rotor groove (6) in the first rotor punching plate (4) located between an inner hole edge and an outer circle of the second rotor punching plate (2) is smaller than a total cross-sectional area of ​​the rotor groove (6) in the first rotor punching plate (4).

2. 2. The motor rotor according to claim 1, characterized in that the total cross-sectional area of ​​the rotor grooves (6) in the first rotor punching plate (4) located in the inner hole of the second rotor punching plate (2) accounts for at least 30% of the total cross-sectional area of ​​the rotor grooves (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 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.

3. 2. The motor rotor according to claim 1, wherein at least two of the lines connecting the center of the rotor core and different points on the edge of the inner hole of the second rotor punching plate (2) are unequal in length.

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

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

6. 2. The motor rotor according to claim 1, characterized in that the width in the d-axis direction between the inner hole of the second rotor punching plate (2) and the communicating groove (21) must be greater than the width of the dividing rib (8) between the communicating groove (21) and the rotor groove (6), and / or the radial width between the inner hole edge of the second rotor punching plate (2) and the outer circle is not equal in different positions, 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 the total cross-sectional area of ​​the rotor grooves (6) in the first rotor punching plate (4) located in the inner hole of the second rotor punching plate (2) accounts for at least 20% of the total flow area of ​​the motor, and / or the cross-sectional area of ​​the rotor grooves (6) located in the inner hole of the second rotor punching plate (2) in each layer of magnetic barrier layers in the first rotor punching plate (4) gradually decreases from the rotor axial hole (7) side to the rotor outer circle side.

8. 2. The motor rotor according to claim 1, characterized in that the maximum width of the outer contour of the end ring (3) is equal to or less than the maximum width of the outer contour of the second rotor punching plate (2), the maximum distance from the center of the rotor core to the end face of the end ring (3) is equal to or greater than the maximum distance from the center of the rotor core to the end face of the second rotor punching plate (2), and / or the radial width between the inner hole edge and the outer circle of the end ring (3) is k9 on the d-axis and k10 on the q-axis, satisfying 1.1≦k9 / k10≦2.

8.

9. 2. The motor rotor according to claim 1, characterized in that the dividing rib (8) has a center point on an axial plane on which the side edge closer to the outer circle of the rotor is located, the distance in the d-axis direction between two of said center points corresponding to 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 conductive channel formed between the filling grooves in the two adjacent magnetic barrier layers is W, satisfying 0≦L<2W.

10. 2. The motor rotor according to claim 1, characterized in that, in a first quadrant consisting of the d-axis and the q-axis, the distance from the center of the dividing rib (8) to the d-axis and the q-axis satisfies kq = -v * kd + λ, where kq is the distance from the center of the dividing rib (8) to the q-axis and kd is the distance from the center of the dividing rib (8) to the d-axis, and satisfies 0.28≦v≦0.46 and 28≦λ≦33.

11. 2. The motor rotor according to claim 1, characterized in that in a direction from the axial hole of the q-axis toward the outer circle of the rotor, the width of the rotor groove (6) in the q-axis becomes smaller in at least three consecutive layers, and / or the minimum width of the magnetic conductive channel between two adjacent filling grooves is W1, d is the minimum width of the magnetic conductive channel formed between the rotor grooves (6) corresponding to the two filling grooves, and W1 ≧ d is satisfied.

12. 2. The motor rotor of claim 1, wherein the minimum distance h1 in the q-axis direction of a magnetic conductive channel between two adjacent magnetic barrier layers must satisfy h1≧1.5h2, h2 being the minimum width in the q-axis direction of the magnetic barrier layer having the smaller width in the q-axis direction among the two adjacent magnetic barrier layers, and / or wherein a magnetic conductive channel is formed between two adjacent magnetic barrier layers, and the width in the q-axis direction of each magnetic conductive channel gradually decreases in the direction from the q-axis shaft hole toward the outer circle of the rotor.

13. 13. The motor rotor according to claim 12, characterized in that in a direction from the axial hole of the q-axis toward the outer circle of the rotor, the width of each magnetic conductive channel in the q-axis becomes smaller for at least three consecutive layers, and / or a magnetic conductive channel is formed between two adjacent magnetic barrier layers, and for a magnetic conductive channel consisting of an arc portion and a straight portion, the width of the magnetic conductive channel gradually increases from the q-axis to both sides of the q-axis.

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

4.

15. 2. The motor rotor according to claim 1, wherein in the outer magnetic barrier layer close to 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) close to the rotor groove (6) is k3, and in the inner magnetic barrier layer adjacent thereto and close 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) close to the rotor groove (6) is k4, wherein 0.5≦k3 / k4≦1, or 0.5≦k4 / k3≦1.

16. 2. The motor rotor of claim 1, wherein in the outermost magnetic barrier layer close to 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) close to the rotor groove (6) is k5, and in the innermost magnetic barrier layer close to the rotor shaft hole (7), the width in the d-axis direction between the ends of the two second filling grooves (52) at both ends of the rotor groove (6) close to the rotor groove (6) is k6, and 0.5≦k5 / k6≦1, or 0.5≦k6 / k5≦1.

17. The motor rotor according to claim 1, characterized in that the first filling groove (51) is located in the q-axis direction on the outer periphery of the rotor, has a divided structure consisting of a plurality of q-axis filling grooves (511), and a rib (9) is provided between two adjacent q-axis filling grooves (511).

18. 18. The motor rotor of claim 17, characterized in that the number of ribs (9) in the first filling groove (51) is y, where y satisfies 1≦y≦4, and / or the width in the d-axis direction of the ribs (9) between any two adjacent q-axis filling grooves (511) is L3, where 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 any two adjacent q-axis filling grooves (511).

19. The sum of the widths of the ribs (9) between any two adjacent q-axis filling grooves (511) in the d-axis direction is [0050] 20. The motor rotor of claim 18, wherein: ##EQU1## is the sum of the widths of each q-axis fill groove (511) in the d-axis direction.

20. 18. The motor rotor of claim 17, wherein the difference in cross-sectional area of ​​each q-axis filling groove (511) is within ±30%.

21. The motor rotor according to claim 1, characterized in that the included angle α1 between the lines connecting both ends of the first filling groove (51) and the center of the rotor satisfies 20°≦α1≦60°, and / or the deviation in parallelism between the longitudinal extension direction of the filling groove and the d-axis is 5% or less.

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

23. The motor rotor of claim 1, characterized in that 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, and / or the ratio of the distance in the q-axis of the side closest to the axial hole (7) of the innermost two magnetic barrier layers closest to the axial hole (7) to the width of the rotation shaft in the q-axis is greater than 1.

2.

24. 2. The motor rotor according to claim 1, wherein the ratio of the diameter of the arc portion of the side closest to the axial hole (7) of the innermost magnetic barrier layer closest to the axial hole (7) to the width on the q-axis of the rotation shaft is greater than 2.

25. 2. The motor rotor according to claim 1, characterized in that the first filling groove (51) has a maximum thickness in the q-axis direction k, the second filling groove (52) in the magnetic barrier layer adjacent thereto has a maximum thickness in the q-axis direction k1, and the magnetic conductive channel connected thereto has a minimum thickness in the q-axis direction k2, where 1<k / k1≦2 and 0.8<k / k2≦1.

6.

26. The motor rotor as described in claim 1, characterized in that the maximum width in the q-axis direction of the end of the filling groove close to 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 close to the q-axis of the rotor.

27. 27. The motor rotor of claim 26, wherein the deviation in width of the filling groove in the q-axis direction from the outer circle side of the rotor to the q-axis of the rotor is 5% or less.

28. 2. The motor rotor according to claim 1, characterized in that the filling grooves in the first rotor punching plate (4) have at least five kinds of filling grooves with different cross-sectional areas, and / or the total cross-sectional area of ​​the first filling groove (51) and the second filling groove (52) accounts for 30% to 70% of the total cross-sectional area of ​​the first filling groove (51), the second filling groove (52) and the rotor groove (6).

29. 2. The motor rotor according to claim 1, wherein a ratio τ between a maximum value and a minimum value of thickness in the q-axis direction of all the filling grooves satisfies 1≦τ≦2.

30. 30. The motor rotor of claim 29, wherein 1.3≦τ≦1.

5.

31. 2. The motor rotor according to claim 1, wherein the width of each of the second filling grooves in the d-axis direction gradually increases in a direction from the outer circle of the rotor on the q-axis toward the shaft hole.

32. The motor rotor according to claim 31, characterized in that in a direction from the outer circle of the rotor on the q-axis toward the shaft hole, the maximum width of each second filling groove (52) in the d-axis direction increases in at least three consecutive layers.

33. A motor rotor as described in claim 32, characterized in that in a direction from the q-axis axial hole toward the outer circle of the rotor, the maximum width of each second filling groove (52) in the d-axis direction becomes continuously smaller from the second magnetic barrier layer to the outermost magnetic barrier layer closest to the outer circle of the rotor.

34. 2. The motor rotor according to claim 1, wherein at least a part of the first filling groove (51) and the second filling groove (52) is filled with a conductive non-magnetic material, and the filling groove is self-shorted through the end rings (3) at both ends of the second rotor punching plate to form a cage structure.

35. The motor rotor according to claim 1, characterized in that the rotor groove (6) is composed of an arc portion and / or a straight portion, the radius of curvature of the arc portion of the rotor groove (6) gradually increases from the axial hole (7) side of the rotor to the outer circle side of the rotor, and the radius of curvature of the outer arc of the rotor groove (6) of the same layer is larger than the radius of curvature of the inner arc, the arc portion protrudes in the outer circle direction toward the axial hole (7), or both ends of the rotor groove (6) extend in the d-axis direction to become straight portions, some or all of both ends of the rotor groove (6) are parallel to the d-axis, and the width of the rotor groove (6) gradually increases from the central position of the rotor groove (6) to both ends.

36. The motor rotor of claim 1, characterized in that, from the rotor axial hole (7) toward the outer circle of the rotor, the length of the curve between the ends of the rotor grooves (6) close to the two second filling grooves (52) of each layer gradually decreases, and the decrease rate of the length of the curve of adjacent rotor grooves (6) is 5% to 25%, and / or the maximum width of the axial hole (7) in the q-axis direction is less than or equal to the maximum width of the axial hole (7) in the d-axis direction.

37. A self-starting synchronous reluctance motor comprising a stator and a motor rotor according to any one of claims 1 to 36.

38. The self-starting synchronous reluctance motor according to claim 37, characterized in that the dividing rib (8) has a center point on an axial plane on which the side edge closer to the outer circle of the rotor is located, the distance in the d-axis direction between two such center points corresponding to two dividing ribs (8) in any two adjacent magnetic barrier layers is L, and 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, satisfying 0≦L<8σ.

39. 38. The self-starting synchronous reluctance motor of claim 37, wherein the width in the d-axis direction of the divided rib (8) of the outermost magnetic barrier layer close to the outer circle of the rotor along the q-axis is L1, and the width in the d-axis direction of the divided rib (8) of the innermost magnetic barrier layer close to the axial hole (7) is L2, L1 is equal to or greater than L2, and L1≧0.5*σ, σ being the width of the air gap between the inner wall of the inner circle of the stator and the outer circle of the rotor.

40. The first filling groove (51) is located in the q-axis direction on the outer periphery of the rotor, has a divided structure consisting of a plurality of q-axis filling grooves (511), and a rib (9) is provided between two adjacent q-axis filling grooves (511); 38. The self-starting synchronous reluctance motor according to claim 37, characterized in that the difference in width between each rib (9) is within ±20%, and the minimum value L3 of the width of each rib (9) 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.

41. The self-starting synchronous reluctance motor according to claim 37, characterized in that along the q-axis, a distance between the filling groove of the innermost magnetic barrier layer close to the axial hole (7) and the outer circle of the rotor is h3, a distance between the outer 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, 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.

42. 38. A compressor comprising the self-starting synchronous reluctance motor of claim 37.

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