Motor rotor and self-starting synchronous reluctance motor and compressor

Abstract

This invention provides a motor rotor and its self-starting synchronous reluctance motor and compressor. The motor rotor includes a rotor core with filling slots and slit slots formed on the core. The filling slots include a second filling slot and a first filling slot. An outer magnetic barrier layer includes the first filling slot, and an inner magnetic barrier layer includes the slit slot and second filling slots located at both ends of the slit slot. Within the same inner magnetic barrier layer, a dividing rib is provided between the second filling slot and the slit slot. In the first quadrant formed by the d-axis and q-axis, the distance relationship between the center of the dividing rib and the d-axis satisfies Wq = -ν*Wd + λ, where Wq is the distance from the center of the dividing rib to the q-axis, Wd is the distance from the center of the dividing rib to the d-axis, 0.28 ≤ ν ≤ 0.46, and 28 ≤ λ ≤ 33. According to this invention, by limiting the position and width of the dividing rib, the area of ​​the second filling slot that bears pressure when filling material can be increased, thereby reducing rotor deformation during manufacturing and lowering the manufacturing difficulty.

Description

Technical Field

[0001] This invention belongs to the field of motor design technology, specifically relating to a motor rotor and its self-starting synchronous reluctance motor and compressor. Background Technology

[0002] Self-starting synchronous reluctance motors combine the advantages of asynchronous motors with those of synchronous reluctance motors. They achieve self-starting through asynchronous torque generated by the rotor bars, eliminating the need for a frequency converter. Compared to asynchronous motors, they offer constant speed operation, lower rotor losses, and improved efficiency during synchronous operation. Compared to asynchronous-starting permanent magnet synchronous motors, they do not use permanent magnets, resulting in lower costs and eliminating the demagnetization problem associated with permanent magnets. However, the multi-layered magnetic barrier structure of self-starting synchronous reluctance motors makes them susceptible to pressure deformation during rotor core manufacturing. Summary of the Invention

[0003] Therefore, the present invention provides a motor rotor and its self-starting synchronous reluctance motor and compressor, which can overcome the shortcomings of the self-starting synchronous reluctance motor in the related art, which has multiple magnetic barrier layers on the motor rotor, resulting in easy pressure deformation during the manufacturing process of the motor rotor core.

[0004] To address the aforementioned problems, this invention provides a motor rotor, comprising a rotor core. The rotor core has filling slots and slit slots. The filling slots include a second filling slot and a first filling slot. The rotor core is provided with multiple magnetic barrier layers spaced along its q-axis. These multiple magnetic barrier layers include two outer magnetic barrier layers and multiple inner magnetic barrier layers located between the two outer magnetic barrier layers. Each outer magnetic barrier layer includes a first filling slot, and each inner magnetic barrier layer includes a slit slot and second filling slots located at both ends of the slit slot. Within the same inner magnetic barrier layer, a dividing rib is provided between the second filling slot and the slit slot. In the first quadrant formed by the d-axis and q-axis, the distance relationship between the center of the dividing rib and the d-axis satisfies Wq=-ν*Wd+λ, where Wq is the distance from the center of the dividing rib to the q-axis, Wd is the distance from the center of the dividing rib to the d-axis, 0.28≤ν≤0.46, and 28≤λ≤33.

[0005] In some embodiments, the distance between the side edges of the dividing ribs in two adjacent magnetic barrier layers that are closer to the outer circle of the rotor along the d-axis is L, and the maximum distance between the magnetic conductive channels formed between the filling grooves in the two adjacent magnetic barrier layers along the q-axis is W, where 0 ≤ L < 2W.

[0006] In some implementations, 0 ≤ L < W.

[0007] In some implementations, 0 ≤ L ≤ 0.8 W.

[0008] In some implementations, the width of the air gap formed between the stator inner diameter and the rotor outer diameter is σ, where 0 ≤ L < 8σ.

[0009] In some implementations, 0 ≤ L ≤ 6σ.

[0010] In some embodiments, the width of the dividing ribs of the magnetic barrier layer composed of the outermost slit groove and the second filling groove near the outer circle of the rotor is L1 along the d-axis, and the width of the dividing ribs of the innermost magnetic barrier layer near the shaft hole is L2 along the d-axis, L1≥L2, and L1≥0.5*σ, where σ is the width of the air gap between the stator and the rotor; and / or, the magnetic barrier structure under one rotor pole is arranged symmetrically about the q-axis, and two or more layers are arranged radially.

[0011] In some embodiments, the minimum width d1 of the magnetic channel between two adjacent second filling slots is greater than the minimum width d2 of the magnetic channel formed between the slit slots corresponding to the two second filling slots, where d1 ≥ 1.15d2.

[0012] In some implementations, 1.2d2≤d1≤1.35d2.

[0013] In some implementations, the minimum distance d3 between two adjacent magnetic barrier layers along the q-axis is d3 ≥ 1.5d4, where d4 is the minimum width along the q-axis of the magnetic barrier layer with the smaller width in the q-axis direction among the two adjacent magnetic barrier layers.

[0014] In some implementations, a magnetic channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic channel gradually decreases in the q-axis direction away from the d-axis.

[0015] In some embodiments, the width of each magnetic channel decreases continuously in the q-axis direction at least three layers away from the d-axis; and / or, a magnetic channel is formed between two adjacent magnetic barrier layers, and for any magnetic channel, the width of the magnetic channel gradually increases from the q-axis to both sides of the q-axis.

[0016] In some embodiments, the width of the second filling groove at both ends of the outermost slit groove near the outer circle of the rotor along the d-axis is L3, and the width of the second filling groove at both ends of the adjacent slit groove near the shaft hole side along the d-axis is L4, 0.2≤L3 / L4≤0.9; and / or, the width of the second filling groove at both ends of the innermost slit groove near the shaft hole side along the d-axis is L5, 0.1≤L3 / L5≤0.7.

[0017] In some implementations, 0.45 ≤ L3 / L4 ≤ 0.65; and / or, 0.3 ≤ L3 / L5 ≤ 0.35.

[0018] In some embodiments, in the outermost magnetic barrier layer near the outer circumference of the rotor, the distance along the d-axis between the dividing rib between the slit slot and the filling slot and the dividing rib between the adjacent slit slot and the filling slot in the outermost magnetic barrier layer is L6, and the distance along the d-axis between the dividing rib between the slit slot and the filling slot in the outermost magnetic barrier layer and the dividing rib between the slit slot and the filling slot in the innermost magnetic barrier layer near the rotor shaft hole is L7. Then the ratio of L6 to L7 satisfies 0 ≤ L6 / L7 ≤ 0.6.

[0019] In some implementations, 0 ≤ L6 / L7 ≤ 0.4.

[0020] In some implementations, 0 ≤ L6 / L7 ≤ 0.2.

[0021] In some embodiments, in each magnetic barrier layer, the ratio of the width of the slit groove on the q-axis to the width of the slit groove near the end of the filling groove is τ1, and τ1 gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer; and / or, in each magnetic barrier layer, the ratio of the maximum width of the filling groove along the q-axis to the width of the slit groove on the q-axis is τ2, where τ2 > 1.4.

[0022] In some implementations, 1.5 < τ2 < 3.0.

[0023] In some embodiments, the slit groove is composed of arc segments and / or straight segments, and is spaced apart along the q-axis. From the rotor shaft hole side to the rotor outer circle side, the curvature of the arc segment of the slit groove gradually increases, and the curvature of the outer circle arc of the slit groove in the same layer is greater than that of the inner circle arc; or, the two ends of the slit groove extend generally along the d-axis direction, and the width of the slit groove gradually increases from the middle position of the slit groove to both ends.

[0024] In some implementations, the ends of some or all of the slit slots are parallel to the d-axis.

[0025] In some embodiments, some slit grooves are irregularly shaped grooves, and each irregularly shaped groove includes a first straight groove segment, an arc groove segment and a second straight groove segment connected in sequence, and the first straight groove segment and the second straight groove segment are both parallel to the d-axis, and the arc groove segment protrudes toward the side away from the shaft hole.

[0026] In some embodiments, when some or all of the slit grooves are arc-shaped grooves, the arc-shaped grooves are arranged to avoid the shaft hole and protrude toward the side away from the shaft hole; and / or, some of the slit grooves are straight grooves, the straight grooves are arranged parallel to the d-axis and are located between the first filling groove and the irregular groove.

[0027] In some embodiments, from the rotor shaft hole side to the rotor outer circle side, the curve length between the ends of each layer of slit grooves near the two second filling grooves gradually decreases, and the curve length of adjacent slit grooves decreases by 5% to 20%; and / or, the interval d5 between the filling groove and the rotor outer circle satisfies d5≥0.5σ, where σ is the width of the air gap between the stator inner diameter and the rotor outer diameter.

[0028] In some embodiments, the angular deviation of the extension direction of the filling groove from the d-axis does not exceed 5%; and / or, the width of the end of the filling groove near the outer circle of the rotor along the q-axis is not greater than the width of the end of the filling groove near the inner hole of the rotor along the q-axis.

[0029] In some implementations, the width deviation of the filling groove along the q-axis from the outer circle side of the rotor to the q-axis of the rotor is no more than 5%.

[0030] In some embodiments, the rotor core has at least five different types of filling slots with different filling areas; and / or, the total filling area of ​​the first filling slot and the second filling slot accounts for 30% to 70% of the total area of ​​the first filling slot, the second filling slot and the slit slot.

[0031] In some embodiments, the total filling area of ​​the first filling groove and the second filling groove accounts for 35% to 50% of the total area of ​​the first filling groove, the second filling groove and the slit groove.

[0032] In some implementations, the ratio τ between the maximum and minimum thicknesses of all filled grooves along the q-axis is 1 ≤ τ ≤ 2.

[0033] In some implementations, 1.3 ≤ τ ≤ 1.5.

[0034] In some implementations, the maximum thickness of each second filling groove along the q-axis gradually increases toward the d-axis.

[0035] In some implementations, the maximum width of each second filling groove increases continuously in at least three layers along the q-axis direction, toward the d-axis.

[0036] In some embodiments, the maximum width of each second filling groove decreases continuously along the q-axis direction from the second magnetic barrier layer near the d-axis to the magnetic barrier layer near the outer circle of the rotor, moving away from the d-axis.

[0037] In some embodiments, both the first and second filling slots are filled with conductive but non-magnetic materials, and the filling slots are self-short-circuited and connected by end rings at both ends of the rotor core to form a squirrel cage structure; and / or, the first filling slot is located on the q-axis direction of the outer periphery of the rotor and extends in a direction parallel to the d-axis, and the first filling slot includes n q-axis filling slots, where n≥1.

[0038] In some embodiments, there are ribs between two adjacent q-axis filling slots, the number of which m satisfies m≥3, and the ratio of m to the rotor radius Rr satisfies m / Rr≥0.07, and the ratio of the sum of the widths of the ribs along the d-axis direction ∑L8 to the rotor radius Rr satisfies ∑L8 / Rr≥0.045, where L8 is the width of the rib.

[0039] In some implementations, the width difference between the ribs is within ±20%, and the minimum width L9 of each rib should satisfy L9≥σ, where σ is the width of the air gap between the stator inner diameter and the rotor outer diameter.

[0040] In some embodiments, the angle between the two ends of the first filling groove and the line connecting the rotor center is α1, where 20°≤α1≤60°.

[0041] In some implementations, 30°≤α1≤50°.

[0042] In some implementations, 30°≤α1≤35°.

[0043] In some embodiments, the width of the first filling groove along the d-axis is smaller than the width along the d-axis between the ends of the two second filling grooves in the adjacent magnetic barrier layer that are closer to the slit groove.

[0044] In some embodiments, the ratio of the distance L10 from the first filling groove to the rotor center in the q-axis direction to the rotor radius Rr satisfies 0.82≤L10 / Rr≤0.96; and / or, the ratio of the distance on the q-axis between the sides of the two innermost magnetic barrier layers near the shaft hole to the width of the shaft in the q-axis is greater than 1.2; and / or, the ratio of the diameter of the arc segment of the side of the innermost magnetic barrier layer near the shaft hole to the width of the shaft in the q-axis is greater than 2; and / or, the maximum width of the shaft hole in the q-axis direction is not greater than the maximum width of the shaft hole in the d-axis direction.

[0045] The present invention also provides a self-starting synchronous reluctance motor, including the motor rotor described above.

[0046] The present invention also provides a compressor, comprising the above-described self-starting synchronous reluctance motor.

[0047] The present invention provides a motor rotor and its self-starting synchronous reluctance motor and compressor, which defines the position and width of the dividing ribs, thereby increasing the area of ​​the second filling groove that bears pressure when filling material, thus reducing the deformation of the rotor during the manufacturing process and reducing the difficulty of the process. Attached Figure Description

[0048] Figure 1 This is a schematic diagram (axial direction) of the rotor core of the motor rotor according to an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram (axial direction) of the rotor core of a motor rotor according to another embodiment of the present invention;

[0050] Figure 3 This paper compares the efficiency of a motor using the technical solution of the present invention with that of a motor in the prior art.

[0051] The reference numerals in the attached figures are as follows:

[0052] 1. Rotor core; 21. First filling groove; 22. Second filling groove; 3. Slit groove; 4. Shaft hole; 5. Dividing rib; 6. Rib. Detailed Implementation

[0053] See also Figures 1 to 3 As shown in the embodiment of the present invention, the present invention provides a self-starting synchronous reluctance motor rotor, which includes a rotor core 1 with rotor laminations stacked together. By designing the position and width of the dividing ribs 5 between the second filling groove 22 and the slit groove 3 in each magnetic barrier layer, the present invention can enhance the mechanical strength of the rotor, reduce the pressure deformation of the rotor during manufacturing, and simultaneously reduce magnetic leakage between the second filling groove 22 and the slit groove 3, thereby improving motor efficiency.

[0054] In this invention, the second filling groove 22 and the slit groove 3 or the first filling groove 21 on the rotor core 1 form a multi-layer magnetic barrier structure of the rotor. In each layer of the magnetic barrier structure composed of the second filling groove 22 and the slit groove 3, there is a dividing rib 5 between the second filling groove 22 and the slit groove 3. Within the first quadrant formed by the d and q axes, the distance relationship between the center of the dividing rib 5 and the rotor's d and q axes satisfies Wq=-ν*Wd+λ, where Wq is the distance from the center of the dividing rib 5 to the q axis, Wd is the distance from the center of the dividing rib 5 to the d axis, the coefficient ν satisfies 0.28≤ν≤0.46 (dimensionless), and the coefficient λ satisfies 28≤λ≤33 (dimensions consistent with Wq and Wd). The dividing rib 5 can enhance the mechanical strength of the rotor, reduce rotor deformation during manufacturing, and reduce process difficulty. Limiting the position and width of the dividing rib 5 can increase the area of ​​the second filling groove 22 that bears pressure when filling material, thereby reducing rotor deformation during manufacturing and lowering process difficulty. Figure 3 The diagram shows a comparison of motor efficiency between the technology of this invention and existing technologies. The technology of this invention can resist the pressure deformation caused during rotor manufacturing, enhance the mechanical strength of the rotor, and improve motor efficiency.

[0055] In some embodiments, the distance along the d-axis between the sides of the dividing ribs 5 near the outer circle of the rotor in two adjacent magnetic barrier layers is L, and the maximum distance along the q-axis between the magnetic channels formed between the filling slots in the two adjacent magnetic barrier layers is W. Then L should satisfy 0 ≤ L < 2W, more preferably 0 ≤ L < W, and most preferably 0 ≤ L ≤ 0.8W. Limiting the minimum distance between the rotor filling slots can, on the one hand, reduce the saturation of the magnetic channels between the filling slots, and on the other hand, stagger the relative positions of the magnetic channels and the stator teeth. This helps to reduce motor harmonics, reduce torque ripple, reduce harmonic losses, and improve motor efficiency and operational stability.

[0056] In some embodiments, the width of the air gap formed between the stator inner diameter and the rotor outer diameter is σ, then L should satisfy 0≤L<8σ, more preferably, 0≤L≤6σ. Limiting the relative distance of the dividing ribs 5 between each filling groove and the slit groove 3 of the rotor can increase the area of ​​pressure-bearing between two adjacent magnetic barrier layers, forming a mutual support effect, thereby reducing the deformation of the rotor during the manufacturing process and reducing the difficulty of the process.

[0057] In some embodiments, the width of the dividing rib 5 of the magnetic barrier layer, which is composed of the outermost slit groove 3 and the second filling groove 22 near the outer circumference of the rotor, along the d-axis is L1, and the width of the dividing rib 5 of the innermost magnetic barrier layer near the shaft hole side along the d-axis is L2. L1 is not less than L2, and L1 ≥ 0.5 * σ, where σ is the width of the air gap between the stator and the rotor. Limiting the minimum width of the dividing rib 5 can reduce the processing difficulty and improve the mechanical strength of the rotor; L1 ≥ L2 can reduce the leakage flux of the inner magnetic barrier layer and improve the motor efficiency.

[0058] In some embodiments, the plane on which the side of the dividing rib 5 is located is parallel to or intersects the plane on which the q axis is located, that is, the shape of the dividing rib 5 is not limited to a rectangle, a quadrilateral, or an arc.

[0059] In this invention, the magnetic barrier layer structure under a rotor pole is arranged symmetrically about the q-axis, and two or more layers are arranged radially.

[0060] In some embodiments, the minimum width d1 of the magnetic channel between two adjacent second filling slots 22 is greater than the minimum width d2 of the magnetic channel formed between the slit slots 3 corresponding to the two second filling slots 22. d1 and d2 satisfy d1≥1.15d2, and more preferably, 1.2d2≤d1≤1.35d2. The purpose is to ensure that there is sufficient width between the filling slots to avoid magnetic field saturation and affect the magnetic flux flow of the channels between the magnetic barrier layers.

[0061] In some implementations, the minimum distance d3 between two adjacent magnetic barrier layers along the q-axis should satisfy d3≥1.5d4, where d4 is the minimum width along the q-axis of the magnetic barrier layer with the smaller width among the two adjacent magnetic barrier layers. Limiting the minimum distance between adjacent magnetic barrier layers can reduce the machining difficulty of the rotor and ensure the uniformity and unsaturation of the rotor's magnetic flux density distribution.

[0062] In some embodiments, a magnetic channel is formed between two adjacent magnetic barrier layers. The width of each magnetic channel gradually decreases in the q-axis direction away from the d-axis; more preferably, the width of each magnetic channel decreases continuously for at least three layers in the q-axis direction away from the d-axis. For any given magnetic channel, its width gradually increases from the q-axis to both sides (the width of the magnetic channel is defined as the shortest distance from a point on one side of the magnetic channel to the other side). The magnetic channel closer to the shaft hole 4 has a greater interaction with the stator and a greater impact on motor performance. This design, while making reasonable use of rotor space, ensures the width of the magnetic channel near the shaft hole, which helps improve motor performance.

[0063] In some embodiments, the width of the second filling groove 22 at both ends of the outermost slit groove 3 near the outer circumference of the rotor along the d-axis is L3; the width of the second filling groove 22 at both ends of the adjacent slit groove 3 near the shaft hole side along the d-axis is L4. Then, L3 and L4 should satisfy 0.2 ≤ L3 / L4 ≤ 0.9, more preferably, 0.45 ≤ L3 / L4 ≤ 0.65. Given the limited rotor space, this arrangement can increase the area of ​​the filling groove and improve the motor's starting capability.

[0064] In some embodiments, the width of the second filling groove 22 at both ends of the outermost slit groove 3 near the outer circumference of the rotor along the d-axis is L3; the width of the second filling groove 22 at both ends of the innermost slit groove 3 near the shaft hole side along the d-axis is L5. Then, L3 and L5 should satisfy 0.1≤L3 / L5≤0.7, more preferably, 0.3≤L3 / L5≤0.35. Given the limited rotor space, this arrangement can increase the area of ​​the filling grooves and improve the motor's starting capability.

[0065] In some embodiments, in the outermost magnetic barrier layer near the outer circumference of the rotor, the distance along the d-axis between the dividing rib 5 between the slit slot 3 and the filling slot and the dividing rib 5 between the adjacent slit slot 3 and the filling slot in the outermost magnetic barrier layer is L6; the distance along the d-axis between the dividing rib 5 between the slit slot 3 and the filling slot in the outermost magnetic barrier layer and the dividing rib 5 between the slit slot 3 and the filling slot in the innermost magnetic barrier layer near the rotor shaft hole is L7. The ratio of L6 to L7 satisfies 0 ≤ L6 / L7 ≤ 0.6, more preferably 0 ≤ L6 / L7 ≤ 0.4, and most preferably 0 ≤ L6 / L7 ≤ 0.2. Limiting the minimum and maximum relative distances of the dividing ribs 5 between each filling slot and the slit slot 3 of the rotor can increase the area of ​​pressure-bearing between the magnetic barrier layers, forming a mutual support effect, thereby reducing rotor deformation during manufacturing and lowering the process difficulty.

[0066] In some embodiments, the ratio of the width of the slit groove 3 along the q-axis to the width of the slit groove 3 near the end of the filling groove in each magnetic barrier layer is τ1, and τ1 gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer. In each magnetic barrier layer, the ratio of the maximum width of the filling groove along the q-axis to the width of the slit groove 3 along the q-axis in each magnetic barrier layer is τ2, where τ2 > 1.4, preferably 1.5 < τ2 < 3.0. This ensures both the width of the magnetic conductive channel between the inner magnetic barrier layers and a certain proportion of magnetic barrier layers, thus improving motor performance.

[0067] In some embodiments, the slit slot 3 is composed of arc segments and / or straight segments, and is spaced apart along the q-axis. From the rotor shaft hole side to the rotor outer circle side, the curvature of the arc segments of the slit slot 3 gradually increases, and the curvature of the outer circle of the slit slot 3 in the same layer is greater than that of the inner circle; or the two ends of the slit slot 3 extend generally along the d-axis direction, and the width of the slit slot 3 gradually increases from the middle position (q-axis) to both ends (d-axis). A shaft hole 4 is opened in the middle of the rotor. This arrangement can increase the utilization rate of rotor space, and the slit slots 3 can be reasonably arranged to increase the rotor salient pole ratio and improve the motor reluctance torque.

[0068] In some embodiments, the two ends of some or all of the slit slots 3 are parallel to the d-axis. This arrangement can increase the utilization rate of the rotor space, rationally arrange the slit slots 3, and at the same time ensure the width of the magnetic channel, which helps to improve the motor performance.

[0069] In some embodiments, the slit groove 3 is one or more of a straight groove, an arc groove, or an irregularly shaped groove.

[0070] In some embodiments, some slit slots 3 are irregularly shaped slots, each including a first straight slot segment, an arc slot segment, and a second straight slot segment connected in sequence. Both the first and second straight slot segments are parallel to the d-axis, and the arc slot segment protrudes towards the side away from the shaft hole 4. When some or all of the slit slots 3 are arc slots, the arc slots are positioned to avoid the shaft hole 4, and protrude towards the side away from the shaft hole 4. Some slit slots 3 are straight slots, parallel to the d-axis, and located between the first filling slot 21 and the irregularly shaped slots. This arrangement allows for efficient use of rotor space while ensuring the width of the magnetic conduction channel near the shaft hole, thus improving motor performance.

[0071] In some embodiments, from the rotor shaft hole side to the rotor outer circle side, the curve length between the ends of each layer of slit groove 3 near the two second filling grooves 22 gradually decreases, and the curve length of adjacent slit grooves 3 decreases by 5% to 20%. A shaft hole 4 is provided in the middle of the rotor. The purpose of this arrangement is to ensure a certain proportion of magnetic barrier layer while making reasonable use of rotor space, thereby improving motor performance.

[0072] In some implementations, the gap d5 between the filling groove and the outer diameter of the rotor satisfies d5≥0.5σ, where σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor. This reduces motor leakage flux and improves motor efficiency while ensuring the mechanical strength of the rotor.

[0073] In some implementations, the extension direction of the filling groove is parallel to the d-axis, with an angular deviation of no more than 5%, ensuring that a smooth magnetic channel can be formed between adjacent filling grooves.

[0074] In some embodiments, the width of the end of the filling groove near the outer circle of the rotor along the q-axis is not greater than the width of the end of the filling groove near the inner hole of the rotor along the q-axis. More preferably, the width of the filling groove along the q-axis is approximately equal from the outer circle of the rotor to the q-axis of the rotor, with a width deviation of no more than 5%, to ensure the width of the magnetic channel near the air gap between the rotor magnetic barrier layers and reduce the rotor saturation.

[0075] In some embodiments, the rotor structure includes at least five filling slots of different areas; the total area of ​​the filling slots (first filling slot 21, second filling slot 22) should account for 30% to 70% of the total area of ​​the rotor slots (first filling slot 21, second filling slot 22, slit slot 3), more preferably, the proportion is 35% to 50%, so as to ensure a certain proportion of filling slot area so that the motor has a certain load-bearing starting capability.

[0076] In some implementations, the ratio τ between the maximum and minimum thicknesses of all filling slots along the q-axis satisfies 1 ≤ τ ≤ 2, and more preferably, this ratio should satisfy 1.3 ≤ τ ≤ 1.5. Limiting this ratio prevents the magnetic channel width from becoming too small due to excessive filling slot thickness along the q-axis, thus affecting efficiency, and also prevents the filling slot area from becoming too small due to excessive filling slot thickness along the q-axis, thus affecting startup.

[0077] In some embodiments, the maximum thickness of each second filling groove 22 along the q-axis gradually increases towards the d-axis; more preferably, the maximum width of each second filling groove 22 along the q-axis increases continuously in at least three layers towards the d-axis; most preferably, the maximum width of each second filling groove 22 along the q-axis continuously decreases towards the direction away from the d-axis, from the second magnetic barrier layer near the d-axis to the magnetic barrier layer near the outer circumference of the rotor. This arrangement ensures an appropriate amount of cast aluminum while making reasonable use of the rotor space, thereby improving the motor's starting capability.

[0078] In some embodiments, both the first filling slot 21 and the second filling slot 22 are filled with a conductive but non-magnetic material, preferably aluminum or an aluminum alloy. The filling slots are self-short-circuited by end rings at both ends of the rotor to form a squirrel cage structure. The end ring material is the same as the filling material in the filling slots. The self-short-circuited squirrel cage structure provides asynchronous torque during the motor starting phase to achieve self-starting of the motor; the multi-layer magnetic barrier structure provides reluctance torque to the motor to achieve synchronous operation of the motor.

[0079] In some embodiments, the first filling groove 21 is located on the q-axis direction of the outer periphery of the rotor and extends in a direction parallel to the d-axis. It can be arranged in blocks or as a whole. This arrangement can form a smooth magnetic conductive channel between it and the adjacent magnetic barrier layer.

[0080] In some embodiments, the first filling groove 21 includes multiple q-axis filling grooves, i.e., n≥1, where n is the number of q-axis filling grooves included in the first filling groove 21. The outermost magnetic barrier layer composed of the first filling grooves 21 near the outer circumference of the rotor is the part of the rotor most prone to deformation. Dividing the outermost first filling groove 21 into multiple q-axis filling grooves can reduce the deformation of the rotor at this location.

[0081] In some embodiments, when arranged in blocks, ribs 6 are present between adjacent q-axis filling slots, with the number m satisfying m≥3, and the ratio of m to the rotor radius Rr satisfying m / Rr≥0.07. Simultaneously, the ratio of the sum of the widths of the ribs 6 along the d-axis, ∑L8, to the rotor radius Rr satisfies ∑L8 / Rr≥0.045, where L8 is the width of the rib 6. The outermost magnetic barrier layer, composed of the first filling slots 21, near the outer circumference of the rotor, is the most easily deformed part of the rotor. Dividing the outermost first filling slot 21 into multiple q-axis filling slots can reduce rotor deformation at this location. Simultaneously limiting the total width of the ribs 6 between each q-axis filling slot ensures the force-bearing area of ​​the outermost magnetic barrier layer, further enhancing the rotor's mechanical strength, reducing rotor deformation during manufacturing, and lowering the manufacturing difficulty.

[0082] In some embodiments, the width difference between each rib 6 is within ±20%, and the minimum width L9 of each rib 6 should satisfy L9≥σ, where σ is the width of the air gap between the stator inner diameter and the rotor outer diameter, in order to reduce the local deformation of the rotor at the outermost magnetic barrier layer.

[0083] In some implementations, the width of the same rib 6 along the d-axis may be equal or unequal at different locations. The same rib 6 may have a larger width along the d-axis at locations with a high risk of local deformation, and a smaller width along the d-axis at locations with a low risk of local deformation.

[0084] In some embodiments, the angle α1 between the two ends of the first filling groove 21 and the line connecting it to the rotor center should satisfy 20°≤α1≤60°, more preferably, α1 should satisfy 30°≤α1≤50°, and most preferably, α1 should satisfy 30°≤α1≤35°. With this configuration, the first filling groove 21 forms a magnetic barrier layer and serves as a filling groove, acting both as a magnetic barrier layer to increase the motor's reluctance torque and as a starting squirrel cage to improve the motor's starting performance.

[0085] In some embodiments, the width of the independent filling groove along the d-axis is smaller than the width along the d-axis between the ends of the two second filling grooves 22 in the adjacent magnetic barrier layer near the slit groove 3. The width of the first filling groove 21 along the d-axis is limited to avoid deformation of the rotor toward the shaft hole side or the outer circle side due to excessive width.

[0086] In some embodiments, the ratio of the distance L10 from the first filling groove 21 to the rotor center in the q-axis direction to the rotor radius Rr satisfies 0.82 ≤ L10 / Rr ≤ 0.96. The ratio of the distance on the q-axis between the sides of the two innermost magnetic barrier layers near the shaft hole to the width of the shaft on the q-axis is greater than 1.2. The ratio of the diameter of the arc segment of the side of the innermost magnetic barrier layer near the shaft hole to the width of the shaft on the q-axis is greater than 2. If L10 / Rr is too small, the outermost magnetic channel will be too narrow, increasing motor losses and reducing efficiency; if L10 / Rr is too large, the distance between the first filling groove 21 and the outer circle of the rotor will be too small, increasing the difficulty of processing.

[0087] In some embodiments, the maximum width of the shaft hole 4 in the q-axis direction is not greater than the maximum width of the shaft hole 4 in the d-axis direction. A slit slot 3 is provided in the q-axis direction. This arrangement can increase the utilization rate of the rotor space, so as to reasonably arrange the slit slot 3, thereby increasing the rotor salient pole ratio and improving the motor reluctance torque.

[0088] In some embodiments, the shaft hole 4 is composed of arc segments and / or straight segments.

[0089] like Figure 2 As shown, with Figure 1 The rotor core 1 shown in the figure is different in that the first filling groove 21 of the rotor core 1 in the figure is a whole block arrangement structure, and its shaft hole is elliptical or a shape similar to an ellipse composed of multiple straight lines.

[0090] It should be noted that the length, width, thickness, diameter, etc. of the rotor core 1 and related structures in this invention can all be measured in mm.

[0091] According to an embodiment of the present invention, a self-starting synchronous reluctance motor is also provided, particularly a self-starting synchronous reluctance two-pole motor, including the above-described motor rotor, wherein the load inertia connected to the output end of the motor shaft is less than 60% of the inertia of the motor shaft system itself.

[0092] According to an embodiment of the present invention, a compressor is also provided, including the self-starting synchronous reluctance motor described above.

[0093] This invention provides a self-starting synchronous reluctance motor rotor. The motor achieves self-starting through the asynchronous torque provided by the rotor guide bars (i.e., the components formed after the filler slots are filled), solving the problem of synchronous reluctance motors requiring frequency converter drive. Simultaneously, it reduces motor losses and improves motor efficiency. This motor rotor can reduce motor harmonics, reduce torque ripple, decrease harmonic losses, and improve motor efficiency and operational stability. It can also enhance the rotor's mechanical strength, reduce rotor deformation during manufacturing, and lower the manufacturing difficulty.

[0094] According to an embodiment of the present invention, a self-starting synchronous reluctance motor is also provided, particularly a self-starting synchronous reluctance two-pole motor, including the above-described motor rotor, wherein the load inertia connected to the output end of the motor shaft is less than 60% of the inertia of the motor shaft system itself.

[0095] According to an embodiment of the present invention, a compressor is also provided, including the self-starting synchronous reluctance motor described above.

[0096] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0097] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A motor rotor, characterized in that, The rotor core (1) includes a rotor iron core (1) with a filling groove and a slit groove (3). The filling groove includes a second filling groove (22) and a first filling groove (21). The rotor iron core (1) is provided with multiple magnetic barrier layers spaced along its q-axis. The multiple magnetic barrier layers include two outer magnetic barrier layers and multiple inner magnetic barrier layers located between the two outer magnetic barrier layers. The outer magnetic barrier layer includes the first filling groove (21), and the inner magnetic barrier layer includes the slit groove (3) and the slit groove (3). The second filling groove (22) at both ends of the same inner magnetic barrier layer has a dividing rib (5) between the second filling groove (22) and the slit groove (3). In the first quadrant formed by the d-axis and the q-axis, the distance relationship between the center of the dividing rib (5) and the d-axis and the q-axis satisfies Wq=-ν*Wd+λ, where Wq is the distance from the center of the dividing rib (5) to the q-axis, Wd is the distance from the center of the dividing rib (5) to the d-axis, 0.28≤ν≤0.46, 28≤λ≤33.

2. The motor rotor according to claim 1, characterized in that, The distance between the side edges of the dividing ribs (5) in the adjacent magnetic barrier layers on the side closest to the outer circle of the rotor along the d-axis is L, and the maximum distance between the magnetic channels formed between the filling grooves in the adjacent magnetic barrier layers along the q-axis is W, 0≤L<2W.

3. The motor rotor according to claim 2, characterized in that, 0 ≤ L < W.

4. The motor rotor according to claim 3, characterized in that, 0≤L≤0.8W.

5. The motor rotor according to claim 2, characterized in that, The width of the air gap formed between the inner diameter of the stator and the outer diameter of the rotor is σ, where 0 ≤ L < 8σ.

6. The motor rotor according to claim 5, characterized in that, 0≤L≤6σ.

7. The motor rotor according to claim 1, characterized in that, The width of the dividing rib (5) of the magnetic barrier layer composed of the outermost slit groove (3) and the second filling groove (22) near the outer circle of the rotor is L1 along the d-axis, and the width of the dividing rib (5) of the innermost magnetic barrier layer near the shaft hole is L2 along the d-axis, L1≥L2, and L1≥0.5*σ, where σ is the width of the air gap between the stator and the rotor; and / or, the magnetic barrier structure under one rotor pole is arranged symmetrically about the q-axis and arranged in two or more layers in the radial direction.

8. The motor rotor according to claim 1, characterized in that, The minimum width d1 of the magnetic channel between two adjacent second filling grooves (22) is greater than the minimum width d2 of the magnetic channel formed between the slit grooves (3) corresponding to the two second filling grooves (22), and d1≥1.15d2.

9. The motor rotor according to claim 8, characterized in that, 1.2d2≤d1≤1.35d2.

10. The motor rotor according to claim 1, characterized in that, The minimum distance d3 between two adjacent magnetic barrier layers along the q-axis, where d3 ≥ 1.5d4, and d4 is the minimum width along the q-axis of the magnetic barrier layer with the smaller width in the q-axis direction among the two adjacent magnetic barrier layers.

11. The motor rotor according to claim 1, characterized in that, A magnetic channel is formed between two adjacent magnetic barrier layers. The width of each magnetic channel gradually decreases in the q-axis direction away from the d-axis.

12. The motor rotor according to claim 11, characterized in that, In the direction away from the d-axis, the width of each magnetic channel in the q-axis direction decreases continuously for at least three layers; and / or, a magnetic channel is formed between two adjacent magnetic barrier layers, and for any magnetic channel, the width of the magnetic channel gradually increases from the q-axis to both sides of the q-axis.

13. The motor rotor according to claim 1, characterized in that, The width of the second filling groove (22) at both ends of the outermost slit groove (3) near the outer circle of the rotor along the d-axis is L3, and the width of the second filling groove (22) at both ends of the adjacent slit groove (3) near the shaft hole side along the d-axis is L4, 0.2≤L3 / L4≤0.9; and / or, the width of the second filling groove (22) at both ends of the innermost slit groove (3) near the shaft hole side along the d-axis is L5, 0.1≤L3 / L5≤0.

7.

14. The motor rotor according to claim 13, characterized in that, 0.45≤L3 / L4≤0.65; and / or, 0.3≤L3 / L5≤0.

35.

15. The motor rotor according to claim 1, characterized in that, In the outermost magnetic barrier layer near the outer circle of the rotor, the distance along the d-axis between the dividing rib (5) between the slit groove (3) and the filling groove and the dividing rib (5) between the adjacent slit groove (3) and the filling groove of the outermost magnetic barrier layer is L6. The distance along the d-axis between the dividing rib (5) between the slit groove (3) and the filling groove of the outermost magnetic barrier layer and the dividing rib (5) between the slit groove (3) and the filling groove of the innermost magnetic barrier layer near the rotor shaft hole is L7. The ratio of L6 to L7 satisfies 0≤L6 / L7≤0.

6.

16. The motor rotor according to claim 15, characterized in that, 0≤L6 / L7≤0.

4.

17. The motor rotor according to claim 16, characterized in that, 0≤L6 / L7≤0.

2.

18. The motor rotor according to claim 1, characterized in that, In each magnetic barrier layer, the ratio of the width of the slit groove (3) on the q axis to the width of the slit groove (3) near the end of the filling groove is τ1, and τ1 gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer; and / or, in each magnetic barrier layer, the ratio of the maximum width of the filling groove along the q axis to the width of the slit groove (3) on the q axis is τ2, and τ2 > 1.

4.

19. The motor rotor according to claim 18, characterized in that, 1.5 < τ2 < 3.

0.

20. The motor rotor according to claim 1, characterized in that, The slit groove (3) is composed of arc segments and / or straight segments, and is spaced along the q axis. From the rotor shaft hole side to the rotor outer circle side, the arc of the arc segment of the slit groove (3) gradually increases, and the arc of the outer circle of the slit groove (3) in the same layer is greater than the arc of the inner circle; or, the two ends of the slit groove (3) extend roughly along the d axis direction, and the width of the slit groove (3) gradually increases from the middle position of the slit groove (3) to both ends.

21. The motor rotor according to claim 1, characterized in that, The two ends of some or all of the slit groove (3) are parallel to the d-axis.

22. The motor rotor according to claim 1, characterized in that, Some of the slit grooves (3) are irregular grooves, and each irregular groove includes a first straight groove section, an arc groove section and a second straight groove section connected in sequence. The first straight groove section and the second straight groove section are both parallel to the d-axis, and the arc groove section protrudes toward the side away from the shaft hole (4).

23. The motor rotor according to claim 1, characterized in that, When some or all of the slit grooves (3) are arc-shaped grooves, the arc-shaped grooves are provided to avoid the shaft hole (4), and the arc-shaped grooves protrude toward the side away from the shaft hole (4); and / or, some of the slit grooves (3) are straight grooves, the straight grooves are provided parallel to the d-axis, and the straight grooves are located between the first filling groove (21) and the irregular groove.

24. The motor rotor according to claim 1, characterized in that, From the rotor shaft hole side to the rotor outer circle side, the curve length between the ends of each layer of slit groove (3) near the two second filling grooves (22) gradually decreases, and the curve length of adjacent slit grooves (3) decreases by 5% to 20%; and / or, the interval d5 between the filling groove and the rotor outer circle satisfies d5≥0.5σ, where σ is the width of the air gap between the stator inner diameter and the rotor outer diameter.

25. The motor rotor according to claim 1, characterized in that, The angular deviation of the extension direction of the filling groove from the d-axis does not exceed 5%; and / or, the width of the end of the filling groove near the outer circle of the rotor along the q-axis is not greater than the width of the end of the filling groove near the inner hole of the rotor along the q-axis.

26. The motor rotor according to claim 25, characterized in that, From the outer circle of the rotor to the q-axis of the rotor, the width deviation of the filling groove along the q-axis direction shall not exceed 5%.

27. The motor rotor according to claim 1, characterized in that, The rotor core (1) has at least five different types of filling slots with different filling areas; and / or, the total filling area of ​​the first filling slot (21) and the second filling slot (22) accounts for 30% to 70% of the total area of ​​the first filling slot (21), the second filling slot (22) and the slit slot (3).

28. The motor rotor according to claim 27, characterized in that, The total filling area of ​​the first filling groove (21) and the second filling groove (22) accounts for 35% to 50% of the total area of ​​the first filling groove (21), the second filling groove (22) and the slit groove (3).

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

30. The motor rotor according to claim 29, characterized in that, 1.3≤τ≤1.

5.

31. The motor rotor according to claim 1, characterized in that, The maximum thickness of each second filling groove (22) gradually increases along the q-axis direction towards the d-axis.

32. The motor rotor according to claim 31, characterized in that, Towards the d-axis, the maximum width of each second filling groove (22) increases continuously in at least three layers along the q-axis direction.

33. The motor rotor according to claim 32, characterized in that, Moving away from the d-axis, from the second magnetic barrier layer near the d-axis to the magnetic barrier layer near the outer circle of the rotor, the maximum width of each second filling groove (22) decreases continuously along the q-axis direction.

34. The motor rotor according to claim 1, characterized in that, The first filling groove (21) and the second filling groove (22) are both filled with conductive and non-magnetic materials. The filling grooves are connected by self-short-circuit at both ends of the rotor core (1) to form a squirrel cage structure; and / or, the first filling groove (21) is located on the q-axis direction of the outer periphery of the rotor and extends in a direction parallel to the d-axis. The first filling groove (21) includes n q-axis filling grooves, n≥1.

35. The motor rotor according to claim 34, characterized in that, There are ribs (6) between two adjacent q-axis filling slots. The number of ribs m satisfies m≥3, and the ratio of m to the rotor radius Rr satisfies m / Rr≥0.

07. The ratio of the sum of the widths of the ribs (6) along the d-axis direction ∑L8 to the rotor radius Rr satisfies ∑L8 / Rr≥0.045, where L8 is the width of the ribs (6).

36. The motor rotor according to claim 34, characterized in that, The width difference between each rib (6) is within ±20%, and the minimum width L9 of each rib (6) should satisfy L9≥σ, where σ is the width of the air gap between the stator inner diameter and the rotor outer diameter.

37. The motor rotor according to claim 1, characterized in that, The angle between the two ends of the first filling groove (21) and the line connecting the rotor center is α1, where 20°≤α1≤60°.

38. The motor rotor according to claim 37, characterized in that, 30°≤α1≤50°。 39. The motor rotor according to claim 38, characterized in that, 30°≤α1≤35°。 40. The motor rotor according to claim 1, characterized in that, The width of the first filling groove (21) along the d-axis is less than the width along the d-axis between the ends of the two second filling grooves (22) in the adjacent magnetic barrier layer that are closer to the slit groove (3).

41. The motor rotor according to claim 1, characterized in that, The ratio of the distance L10 from the first filling groove (21) to the rotor center in the q-axis direction to the rotor radius Rr satisfies 0.82≤L10 / Rr≤0.96; and / or, the ratio of the distance between the sides of the innermost magnetic barrier layers near the shaft hole on the q-axis and the width of the shaft on the q-axis is greater than 1.2; and / or, the ratio of the diameter of the arc segment of the side of the innermost magnetic barrier layer near the shaft hole on the shaft hole to the width of the shaft on the q-axis is greater than 2; and / or, the maximum width of the shaft hole (4) in the q-axis direction is not greater than the maximum width of the shaft hole (4) in the d-axis direction.

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

43. A compressor, characterized in that, Including the self-starting synchronous reluctance motor as described in claim 42.

Images