Self-starting synchronous reluctance motor rotor, motor, and compressor

Abstract

This invention provides a self-starting synchronous reluctance motor rotor, a motor, and a compressor. The self-starting synchronous reluctance motor rotor includes a rotor core and end rings. The rotor core includes a first rotor lamination and a second rotor lamination. The first rotor lamination has a first filling groove, a second filling groove, and a slit groove. The first filling groove and the slit groove are arranged in the same layer. The second filling groove is located on the outermost layer in the q-axis direction of the rotor and is not in the same layer as the slit groove. The second rotor lamination can completely or partially cover the second filling groove on the first rotor lamination. According to this invention, harmonics generated by eddy currents in the second filling groove can be reduced, the harmonic content of the motor can be reduced, the torque ripple rate and vibration noise of the motor can be improved, and the reliability of motor operation can be enhanced. By effectively reducing magnetic field harmonics, torque ripple and vibration noise problems caused by harmonics can be avoided.

Description

Technical Field

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

[0002] Self-starting synchronous reluctance motors combine the advantages of asynchronous motors with those of synchronous reluctance motors. They can achieve self-starting without a controller by relying on the asynchronous torque generated by the rotor bars, and can also operate efficiently at synchronous speeds. Compared to asynchronous motors, self-starting synchronous reluctance motors operate at synchronous speeds, resulting in lower rotor losses and significantly improved motor efficiency. Compared to self-starting permanent magnet synchronous motors, self-starting synchronous reluctance motors do not use rare-earth permanent magnet materials, leading to lower manufacturing costs and no risk of demagnetization. However, the rotor of a self-starting synchronous reluctance motor is often designed with a multi-layered magnetic barrier structure, resulting in a complex rotor magnetic circuit and high harmonic content during operation, which is detrimental to stable motor performance.

[0003] Because existing self-starting synchronous reluctance motors have technical problems such as complex rotor magnetic circuit structure, high harmonic content during motor operation, and performance issues that are not conducive to stable motor operation, this invention studies and designs a self-starting synchronous reluctance motor rotor, motor, and compressor. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the existing self-starting synchronous reluctance motor, which has a complex rotor magnetic circuit structure, high harmonic content during motor operation, and is not conducive to stable motor operation. Thus, the present invention provides a self-starting synchronous reluctance motor rotor, motor and compressor.

[0005] To address the aforementioned problems, this invention provides a self-starting synchronous reluctance motor rotor, comprising a rotor core and end rings. The rotor core includes a first rotor lamination and a second rotor lamination. The first rotor lamination is provided with a first filling groove, a second filling groove, and a slit groove. The first filling groove and the slit groove are arranged in the same layer. The second filling groove is located on the outermost layer in the q-axis direction of the rotor and is not in the same layer as the slit groove. The second rotor lamination can completely or partially cover the second filling groove on the first rotor lamination.

[0006] In some embodiments, a third filling groove is provided on the second rotor lamination, the third filling groove being disposed opposite to the first filling groove. The second rotor lamination may or may not have a fourth filling groove. When a fourth filling groove is provided, the fourth filling groove is opposite to the second filling groove and the number of the fourth filling groove is less than the number of the second filling groove, so as to partially cover the second filling groove. When a fourth filling groove is not provided, the second rotor lamination can completely cover the position of the second filling groove.

[0007] In some embodiments, the second filling groove is composed of a single integral groove or multiple segmented grooves. When the second filling groove is composed of a single integral groove, no fourth filling groove is provided on the second rotor lamination at the position opposite to the second filling groove. When the second filling groove is composed of multiple segmented grooves, the multiple segmented grooves are connected to form a whole, and no fourth filling groove is provided on the second rotor lamination at the position opposite to the second filling groove, or at least one fourth filling groove is provided, wherein at least one of the fourth filling grooves is partially opposite or completely opposite to the second filling groove, so as to partially or completely block the second filling groove.

[0008] In some embodiments, a first shaft hole is provided at the center of the first rotor lamination, and a second shaft hole is provided at the center of the second rotor lamination, with the second shaft hole being disposed opposite to the first shaft hole.

[0009] In some embodiments, the first rotor lamination and the second rotor lamination are stacked, the second rotor lamination is located at both ends of the rotor core, and the axial stack height of the second rotor lamination at each end is not less than the thickness of a single first rotor lamination.

[0010] In some embodiments, the length, width, or area of ​​some or all of the filling slots on the second rotor lamination is not greater than the filling slots at the same position on the first rotor lamination. The filling slots on the second rotor lamination include a third filling slot and the fourth filling slot, and the filling slots on the first rotor lamination include a first filling slot and a second filling slot.

[0011] In some embodiments, the maximum width of the outer contour of the second rotor lamination is not greater than the diameter of the outer circle of the first rotor lamination, and the second shaft hole of the second rotor lamination is elliptical in shape, with the major axis of the ellipse located on the q-axis and the minor axis located on the d-axis, and the ratio of the length of the major axis to the minor axis, k1 / k2, is in the range of 1.1-1.5.

[0012] In some embodiments, the width kd of the second rotor lamination on the d-axis is greater than its width kq on the q-axis, and 1.1 ≤ kd / kq ≤ 2.8.

[0013] In some embodiments, along the d-axis direction, the width distance from the inner edge of the second shaft hole of the second rotor lamination to the third filling groove is more than 1 times the width distance of the first dividing rib at the position of the first rotor lamination opposite to the inner edge, and the first dividing rib is located between the slit groove and the first filling groove.

[0014] In some embodiments, the area of ​​a plurality of slits in the region of the first rotor lamination opposite to the second shaft hole of the second rotor lamination gradually decreases in the direction outward along the d-axis.

[0015] In some embodiments, the total area of ​​the plurality of slits in the region of the first rotor lamination opposite to the second shaft hole of the second rotor lamination accounts for at least 40% of the total area of ​​the motor flow holes; the total area of ​​the motor flow holes includes the sum of the areas of the stator flow holes and the rotor flow holes.

[0016] In some embodiments, the maximum width of the outer contour of the end ring is not greater than the maximum width of the outer contour of the second rotor lamination, and the maximum distance from the center of the rotor core to the end face of the end ring along the axial direction is not less than the maximum distance from the center of the rotor core to the end face of the second rotor lamination; and / or,

[0017] The end ring has an unequal width structure, with its width md along the d-axis being greater than its width mq along the q-axis, and 1.1≤md / mq≤2.8.

[0018] In some embodiments, when the second rotor lamination is not provided with a fourth filling groove, the first filling groove and the slit groove on the first rotor lamination together form a multi-layer magnetic barrier layer structure of the rotor.

[0019] When the second rotor lamination is provided with a fourth filling groove, the first filling groove, the slit groove and the second filling groove on the first rotor lamination together form a multi-layer magnetic barrier layer structure of the rotor.

[0020] In some embodiments, in each layer of the magnetic barrier layer structure composed of a first filling groove and a slit groove, there is a first dividing rib between the first filling groove and the slit groove. The width L of the first dividing rib along the d-axis in the same layer, the width M of the end of the first filling groove that is arranged in the same layer as the first dividing rib and is connected to the first dividing rib, and L and M satisfy 0.2M < L < 0.35M. At the same time, the width K of the end of the slit groove that is arranged in the same layer as the first dividing rib and is close to the first dividing rib, and K and M satisfy K ≤ M.

[0021] In some embodiments, the second filling groove is composed of multiple non-connected grooves, and there is a second dividing rib between two adjacent grooves. The second dividing rib is a structure of equal width or unequal width. The structure of equal width is a rectangle or a parallelogram, etc., and the structure of unequal width is a trapezoid.

[0022] In some embodiments, the width h1 of the rib with the smallest width among the ribs between the first filling groove and the second filling groove and the outer circle of the rotor, the first dividing rib and the second dividing rib, satisfies h1≥0.5*σ, where σ is the air gap width between the inner diameter of the motor stator and the outer diameter of the rotor.

[0023] In some embodiments, the ratio of the length d1 of the first filling groove at both ends of the outermost slit groove along the d-axis to the length d2 of the first filling groove at both ends of the adjacent slit groove along the d-axis satisfies 0.2≤d1 / d2≤0.9.

[0024] In some embodiments, the ratio of the length d1 of the first filling groove at both ends of the outermost slit groove along the d-axis to the length d3 of the first filling groove at both ends of the innermost slit groove along the d-axis satisfies 0.1≤d1 / d3≤0.7.

[0025] In some embodiments, the long sides of some or all of the two ends of the slit groove are parallel to the d-axis; the slit groove includes at least one of a straight groove and an arc groove; when a portion of the slit groove is a combination of a straight groove and an arc groove, the slit groove is composed of a straight segment, an arc segment, and a straight segment, and the straight segment is parallel to the d-axis, and the arc segment protrudes in a direction away from the shaft hole; when a portion of the slit groove is an arc groove, the arc segment protrudes in a direction away from the shaft hole; when a portion of the slit groove is a straight groove, the long side of the straight groove is parallel to the d-axis and is located at the position closest to the second filling groove.

[0026] In some embodiments, the slit groove is composed of arc segments and / or straight segments. From the rotor shaft hole side to the rotor outer circle side, the curvature of the arc segments of the slit groove gradually increases, and the curvature of the outer circle of the slit groove in the same layer is greater than or equal to the curvature of the inner circle.

[0027] In some embodiments, the width of the slits at the middle position of at least three layers of slits gradually decreases from the radially inner side to the radially outer side.

[0028] In some embodiments, the sum of the widths of all the slits and the second filling groove is

[0029] ∑m2+m1, the radial width from the outer circle of the first shaft hole to the outer circumference of the rotor is m3, and (∑m2+m1) / m3 is 0.2~0.5.

[0030] In some embodiments, in the two innermost slit slots on the first rotor lamination located on both sides of the first shaft hole, the distance between the arcs of the two slots near the first shaft hole along the q-axis is S3, the diameter of the first shaft hole is d, and S3 / d is 1.2 to 1.3. At the same time, the inner arc diameter of the innermost slit slot is 1.5 to 3 times the diameter d of the first shaft hole.

[0031] In some embodiments, the distance between two adjacent first filling slots on the first rotor lamination is S1, satisfying S1≥S2, where S2 is the distance along the q-axis at any position of the two slit slots opposite the two adjacent first filling slots.

[0032] In some embodiments, the total area of ​​all the first filling slots and the second filling slots accounts for 30% to 70% of the total area of ​​all rotor slots, and the rotor slots include the first filling slots, the second filling slots and the slit slots.

[0033] In some embodiments, the included angle α1 between the two ends of the second filling groove and the center of the rotor satisfies 20°≤α1≤60°;

[0034] The deviation of the inclination angle between the extension direction of the first filling groove and the d-axis does not exceed 5°, and the deviation of the inclination angle between the extension direction of the second filling groove and the d-axis does not exceed 5°.

[0035] The distance between the midpoint of the first filling groove of at least three layers and the midpoint of the first filling groove of the adjacent outer layer gradually increases in the outward direction;

[0036] The width of the first filling groove in the same layer deviates from the inside to the outside along the d-axis direction by no more than 5%;

[0037] The width of the first filling groove in at least three layers of the first filling groove continuously decreases from the inside to the outside along the q-axis;

[0038] Along the q-axis, from the inside out, there are at least three layers of the first filling groove. The ratio between the width of each layer and the width of the slit groove at the middle position is greater than 1.4.

[0039] Along the q-axis, from the inside out, the area of ​​at least three layers of first filling grooves gradually decreases, and the rate of decrease gradually increases. Here, the rate of decrease is defined as the ratio of the areas of two adjacent layers of first filling grooves.

[0040] The first rotor lamination contains at least five different types of filling grooves.

[0041] In some embodiments, the first filling slot is filled with a conductive but non-magnetic material, and all filling slots are self-short-circuited and connected 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 first filling slot.

[0042] Some or all of the second filling slots are filled with air, which is blocked by the second rotor laminations to prevent the filling of conductive but non-magnetic materials.

[0043] In some embodiments, there is a magnetic channel between two adjacent magnetic barrier layer structures, the width of the end of all magnetic channels is greater than the width of the center of the magnetic channel, and no filling groove is provided in the middle area of ​​any magnetic channel.

[0044] Along the q-axis, the width of at least three layers of magnetic channels gradually decreases from the inside out.

[0045] The width of any magnetic channel gradually increases from the middle to both sides. Here, the width of the magnetic channel is defined as the shortest distance from any point on one arc to another arc.

[0046] The present invention also provides an electric motor comprising the rotor of a self-starting synchronous reluctance motor as described in any of the preceding claims.

[0047] The present invention also provides a compressor that includes the aforementioned motor.

[0048] The self-starting synchronous reluctance motor rotor, motor, and compressor provided by this invention have the following beneficial effects:

[0049] 1. This invention addresses the issue of motor harmonics by configuring the second rotor lamination to completely or partially cover the second filling groove on the first rotor lamination. When the second filling groove is filled with a conductive but non-magnetic material, the eddy currents generated within it increase the motor's harmonic content. This invention, through the design of the shape and position of the slits and filling grooves on the first and second rotor laminations, restricts the filling of the conductive but non-magnetic material within the second filling groove by the second rotor lamination. This reduces harmonics generated by eddy currents within the second filling groove, lowers the motor's harmonic content, improves the motor's torque ripple rate and vibration noise, and enhances the motor's operational reliability. Furthermore, by effectively reducing magnetic field harmonics, it avoids torque ripple and vibration noise problems caused by harmonics.

[0050] 2. This invention also addresses the issue of magnetic circuit saturation by rationally arranging the size and position of the slits or filling slots corresponding to each layer of magnetic barriers in the multi-layer magnetic barrier structure on the first rotor lamination. This reduces motor harmonic content and improves motor operational reliability. The asynchronous torque provided by the rotor bars enables self-starting of the motor, solving the problem of synchronous reluctance motors requiring frequency converter drive, while simultaneously reducing motor losses and improving motor efficiency.

[0051] 3. The present invention also limits the size of the dividing ribs, which on the one hand will not weaken the strength of the rotor structure due to the dividing ribs being too small, and on the other hand will not increase the leakage flux of the motor and reduce the efficiency due to the dividing ribs being too large. Through the structural design of the second rotor lamination and the size design of the dividing ribs between the rotor filling groove and the slit groove, the mechanical strength of the rotor can also be enhanced. Attached Figure Description

[0052] Figure 1This is a structural diagram of the first rotor lamination of the self-starting synchronous reluctance motor rotor according to the first embodiment of the present invention;

[0053] Figure 2(a) is a structural diagram of the second rotor lamination of the first embodiment of the present invention (the outer layer is completely blocked);

[0054] Figure 2(b) is a structural diagram of the second rotor lamination of the first embodiment of the present invention (outer layer blocking 1);

[0055] Figure 2(c) is a structural diagram of the second rotor lamination of the first embodiment of the present invention (outer layer blocking 2);

[0056] Figure 3 This is an axial view of the rotor core according to the first embodiment of the present invention (the outer layer is completely blocked).

[0057] Figure 4 This is a structural diagram of the rotor end ring according to the first embodiment of the present invention;

[0058] Figure 5 This is an axial view of the rotor structure according to the first embodiment of the present invention;

[0059] Figure 6 This is a perspective view of the rotor structure according to the first embodiment of the present invention;

[0060] Figure 7 This is a structural diagram of the first rotor lamination of the self-starting synchronous reluctance motor rotor according to the second embodiment of the present invention;

[0061] Figure 8 This is a comparison curve of the rotor structure of the present invention and the current waveform of the prior art.

[0062] The reference numerals in the attached figures are as follows:

[0063] 1. Rotor core; 2. Second rotor lamination; 20. Second shaft hole; 21. Third filling groove; 22. Fourth filling groove; 3. End ring; 4. First rotor lamination; 5. Filling groove; 51. First filling groove; 52. Second filling groove; 6. Slit groove; 7. First shaft hole; 8. First dividing rib; 82. Second dividing rib. Detailed Implementation

[0064] like Figure 1-8As shown, the present invention provides a self-starting synchronous reluctance motor rotor, which includes a rotor core 1 and an end ring 3. The rotor core 1 includes a first rotor lamination 4 and a second rotor lamination 2 (preferably, the rotor core 1 is formed by stacking the first rotor lamination 4 and the second rotor lamination 2). The first rotor lamination 4 is provided with a first filling groove 51, a second filling groove 52 and a slit groove 6. The first filling groove 51 and the slit groove 6 are arranged in the same layer. The second filling groove 52 is located on the outermost layer in the q-axis direction of the rotor and is not in the same layer as the slit groove 6. The second rotor lamination 2 can completely or partially cover the second filling groove 52 on the first rotor lamination 4.

[0065] This invention addresses this issue by configuring the second rotor lamination to completely or partially cover the second filling groove on the first rotor lamination. When the second filling groove is filled with a conductive but non-magnetic material, the resulting eddy currents increase the harmonic content of the motor. This invention, through the design of the shape and position of the slits and filling grooves on the first and second rotor laminations, restricts the filling of the conductive but non-magnetic material in the second filling groove by the second rotor lamination. This reduces the harmonics generated by the eddy currents in the second filling groove, lowers the motor's harmonic content, improves the motor's torque ripple rate and vibration noise, and enhances the reliability of motor operation. Furthermore, by effectively reducing magnetic field harmonics, it avoids the torque ripple and vibration noise problems caused by harmonics.

[0066] This invention provides a rotor structure for a self-starting synchronous reluctance motor. This rotor structure, by limiting the second filling slot with the second rotor lamination and limiting the size of the dividing ribs between the rotor filling slot and the slit slot, can weaken the magnetic field harmonics of the motor and improve the stable operation performance of the motor.

[0067] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. Figure 6 This is a schematic diagram of the rotor structure according to the first embodiment of the present invention. The rotor structure includes a rotor core 1 and an end ring 3, wherein the rotor core 1 is formed by stacking a first rotor lamination 4 and a second rotor lamination 2. Figure 1 The first rotor lamination structure diagram is shown in the first embodiment of the present invention. The first rotor lamination 4 is provided with a filling groove 5, a slit groove 6, and a first shaft hole 7. The filling groove 5 includes a second filling groove 52 located on the outermost layer in the q-axis direction of the rotor and not arranged on the same layer as the slit groove, and a first filling groove 51 located on the inner layer of the rotor and arranged on the same layer as the slit groove.

[0068] This invention provides a rotor structure for a self-starting synchronous reluctance motor, the main inventive points of which are as follows:

[0069] The rotor structure includes two parts: the rotor core and the end ring. The rotor core is formed by stacking the first rotor lamination and the second rotor lamination. The first rotor lamination is provided with a filling groove and a slit groove. The filling groove is located on the outer periphery of the rotor. The first filling groove and the slit groove or the second filling groove form a multi-layer magnetic barrier layer structure of the rotor.

[0070] The second rotor lamination is placed at both ends of the iron core on which the first rotor lamination is stacked. The second rotor lamination has the same first filling groove as the first rotor lamination. The second rotor lamination does not have a slit groove. The second rotor lamination has no or only a partial second filling groove.

[0071] In each magnetic barrier layer structure, there are dividing ribs between the slit slots and the filling slots. The width of each dividing rib along the d-axis is L. The width of the filling slot near the rib in the same layer as the dividing rib is M. The width of the slit slot near the rib in the same layer is K. The conditions are met: 0.2M < L < 0.35M, and K ≤ M.

[0072] When the second filler slot is filled with a conductive but non-magnetic material, the eddy currents generated within it will increase the harmonic content of the motor. The second rotor lamination restricts the filling of the conductive but non-magnetic material in the second filler slot, which can reduce the harmonics generated by the eddy currents in the second filler slot, reduce the harmonic content of the motor, and improve the reliability of motor operation.

[0073] In the multi-layer magnetic barrier structure on the first rotor lamination, the size and position of the slit slots or filling slots corresponding to each layer of magnetic barriers are reasonably arranged to avoid magnetic circuit saturation, reduce motor harmonic content, and improve the reliability of motor operation.

[0074] In addition, limiting the size of the dividing ribs ensures that the rotor structure strength is not weakened due to the dividing ribs being too small, and that the motor leakage flux is not increased and efficiency is reduced due to the dividing ribs being too large.

[0075] In some embodiments, a third filling groove 21 is provided on the second rotor lamination 2, the third filling groove 21 being opposite to the first filling groove 51. A fourth filling groove 22 may or may not be provided on the second rotor lamination 2. When the fourth filling groove 22 is provided, it is opposite to the second filling groove 52, and the number of fourth filling grooves 22 is less than the number of second filling grooves 52, thus partially covering the second filling groove 52. When the fourth filling groove 22 is not provided, the second rotor lamination 2 completely covers the position of the second filling groove 52. This invention, by creating a third filling groove on the second rotor lamination opposite to the first filling groove, addresses the issue that the first filling groove and the slit groove form a multi-magnetic field structure, affecting the starting performance of the motor. The guide bar filled in the second filling groove serves a starting function, the same as the first filling groove. Therefore, this invention uses either a partially created fourth filling groove or no fourth filling groove on the second rotor lamination to block the second filling groove, thereby reducing or preventing its conduction.

[0076] Furthermore, the second rotor lamination 2 is provided with a third filling groove 21 that is identical to the first filling groove 51 on the first rotor lamination 4, but the second rotor lamination 2 has no or only a partial fourth filling groove 22, and the second rotor lamination 2 covers part or all of the filling grooves. The purpose of this arrangement of the second rotor lamination is to prevent the filling grooves from being filled with conductive but non-magnetic materials through a blocking effect, thereby avoiding the generation of eddy currents and harmonic magnetic fields in this area and reducing the harmonic content of the motor.

[0077] In some embodiments, the second filling groove 52 is composed of a single integral groove or multiple segmented grooves. When the second filling groove 52 is composed of a single integral groove, a fourth filling groove 22 is not provided on the second rotor lamination 2 at a position opposite to the second filling groove 52. When the second filling groove 52 is composed of multiple segmented grooves, the multiple segmented grooves are connected to form a single unit, and a fourth filling groove is not provided on the second rotor lamination 2 at a position opposite to the second filling groove 52, or at least one fourth filling groove is provided, wherein at least one of the fourth filling grooves 22 is partially opposite or completely opposite to the second filling groove 52, so as to partially or completely block the second filling groove 52. This is a preferred structural form of the second filling groove of the present invention. The second filling groove can be an integral groove structure (second embodiment, such as...). Figure 7 It can also be a segmented slot structure (first embodiment, such as...). Figure 1 The fourth filling groove 22 may be absent (as shown in Figure 2(a)), thus completely blocking the second filling groove. The fourth filling groove 22 may be a multi-segment structure (as shown in Figure 2(b)), thus partially blocking the second filling groove. The fourth filling groove 22 may also be a single-segment structure (as shown in Figure 2(c)), thus partially blocking the second filling groove.

[0078] Figure 7 The figure shows a rotor lamination structure according to the second embodiment of the present invention. As shown, a second filling groove 52 is arranged between the outermost slit slot of the rotor and the outer circle of the rotor. The second filling groove can adopt a connected structure, that is, the dividing rib in the middle of the segmented second filling groove in the first embodiment is removed, and the second filling groove is connected into one piece. Through the blocking effect of the second rotor lamination, the second filling groove is not filled with conductive and non-magnetic material. In the second embodiment, setting the second filling groove into a connected structure can increase the magnetic reluctance difference between the d and q axes, make full use of the magnetic reluctance torque, and at the same time, under the action of the second rotor lamination, it can also reduce the harmonics of the motor magnetic field.

[0079] The second filling slot 52 of the present invention is not limited to being composed of multiple segmented slots or multiple slots connected into a whole. When the second filling slot 52 is composed of multiple segmented slots, there is no fourth filling slot 22 or only a portion of it at the same position on the second rotor lamination 2. When the second filling slots 52 are connected into a whole, there is no fourth filling slot 22 at the same position on the second rotor lamination 2, or there is a fourth filling slot, but the number of the fourth filling slots is smaller than that of the second filling slots. Through the blocking effect of the second rotor lamination, the area of ​​the second filling slot on the first rotor lamination cannot be completely filled, thereby reducing the harmonic content of the motor.

[0080] In some embodiments, a first shaft hole 7 is provided at the center of the first rotor lamination 4, and a second shaft hole 20 is provided at the center of the second rotor lamination 2, with the second shaft hole 20 opposite to the first shaft hole 7. This is a further preferred structural form of the first and second rotor laminations of the present invention. The first shaft hole of the first rotor lamination is preferably circular, and the second shaft hole of the second rotor lamination is preferably elliptical. The second shaft hole is preferably larger in area than the first shaft hole, allowing the rotating shaft to pass through.

[0081] In some embodiments, the first rotor lamination 4 and the second rotor lamination 2 are stacked, with the second rotor lamination 2 located at both axial ends of the rotor core 1, and the axial stack height of the second rotor lamination 2 at each end is not less than the thickness of a single first rotor lamination 4. This is a preferred structural form of the first and second rotor laminations of the present invention. Further, the second rotor laminations are placed at both ends of the rotor core, and the axial stack height of the second rotor laminations at each end is not less than the thickness of a single first rotor lamination. The function of the second rotor laminations is only to block the filling effect of the second filling groove on the rotor core, and their height should not be too large.

[0082] In some embodiments, the length, width, or area of ​​some or all of the filling slots on the second rotor lamination is not greater than the filling slots at the same position on the first rotor lamination. The filling slots on the second rotor lamination include a third filling slot and the fourth filling slot, and the filling slots on the first rotor lamination include a first filling slot and a second filling slot. The area of ​​the filling slots on the second rotor lamination of the present invention should not be too large; otherwise, the filling material may easily penetrate into the slit slots during rotor manufacturing, resulting in material waste.

[0083] In some embodiments, the maximum width of the outer contour of the second rotor lamination 2 is not greater than the diameter of the outer circle of the first rotor lamination 4. The second shaft hole 20 of the second rotor lamination 2 is elliptical in shape, with the major axis of the ellipse located on the q-axis and the minor axis located on the d-axis. The ratio of the lengths of the major and minor axes, k1 / k2, ranges from 1.1 to 1.5. The purpose is that, as part of the rotor core, the outer contour of the second rotor lamination must not be greater than the outer circle of the rotor core to form an air gap of a certain width with the stator; the q-axis width of its inner contour, corresponding to the slots in the rotor core, must not be less than the d-axis width, so that a sufficient area of ​​slots can directly contact the air, forming flow holes and increasing rotor heat dissipation.

[0084] In some embodiments, the width kd of the second rotor lamination 2 on the d-axis is greater than its width kq on the q-axis, and 1.1 ≤ kd / kq ≤ 2.8, more preferably 1.2 ≤ kd / kq ≤ 1.8. This arrangement ensures that the second rotor lamination only blocks a portion of the filling groove and the slit groove, leaving most of the slit groove exposed for use as a flow hole.

[0085] In some embodiments, along the d-axis, the width distance from the inner edge of the second shaft hole 20 of the second rotor lamination 2 to the third filling groove 21 is more than twice the width distance of the first dividing rib 8 at the position of the first rotor lamination opposite to the inner edge. The first dividing rib 8 is located between the slit groove and the first filling groove 51. The function of the first dividing rib here is to separate the distance between the first filling groove and the slit groove. Ensuring the width of the first dividing rib is necessary to better guarantee the filling effect of the filling material during the manufacturing process.

[0086] In some embodiments, the area of ​​the plurality of slits 6 in the region of the first rotor lamination 4 opposite to the second shaft hole 20 of the second rotor lamination 2 gradually decreases along the d-axis outward; and the total area of ​​the plurality of slits 6 in the region of the first rotor lamination 4 opposite to the second shaft hole 20 of the second rotor lamination 2 accounts for at least 40% of the total area of ​​the motor flow holes; the total area of ​​the motor flow holes includes the sum of the areas of the stator flow holes and the rotor flow holes. The slits on the rotor not only act as magnetic barriers but also as flow holes. By ensuring the area ratio of the slits within the inner hole of the second rotor lamination, the flow holes on the rotor can be fully utilized, which is beneficial for the heat dissipation of the motor.

[0087] In some embodiments, the maximum width of the outer contour of the end ring 3 is not greater than the maximum width of the outer contour of the second rotor lamination 2, and the maximum distance from the center of the rotor core 1 to the end face of the end ring 3 along the axial direction is not less than the maximum distance from the center of the rotor core 1 to the end face of the second rotor lamination 2. The maximum width of the outer contour of the end ring is not greater than the maximum width of the outer contour of the second rotor lamination, so as to ensure that the part of the rotor core located on the outer circle side of the rotor that is not covered by the second rotor lamination is subjected to force when filling material, thereby reducing local deformation. The maximum distance from the center of the rotor core to the end face of the end ring is not less than the maximum distance from the center of the rotor core to the end face of the second rotor lamination, ensuring that the rotor has an end ring of a certain volume, which helps to improve the starting capability of the motor.

[0088] The end ring 3 has an unequal width structure, with its width md along the d-axis being greater than its width mq along the q-axis, and 1.1 ≤ md / mq ≤ 2.8, more preferably 1.2 ≤ md / mq ≤ 1.8. This ensures that the width ratio of the end ring in different directions is within this range, which not only guarantees the material usage of the end ring and improves the starting capability of the motor, but also allows most of the slit slot area to be used as a flow hole, improving the motor's heat dissipation capability.

[0089] In some embodiments, when the second rotor lamination 2 is not provided with a fourth filling groove 22, the first filling groove 51 on the first rotor lamination 4 and the slit groove 6 together form a multi-layer magnetic barrier layer structure of the rotor.

[0090] When the second rotor lamination 2 is provided with the fourth filling groove 22, the first filling groove 51, the slit groove 6 and the second filling groove 52 on the first rotor lamination 4 together form the multi-layer magnetic barrier layer structure of the rotor.

[0091] The multi-layered magnetic barrier structure creates a magnetic reluctance difference between the d and q axes of the rotor, thereby generating magnetic reluctance torque.

[0092] In some embodiments, in each layer of the magnetic barrier layer structure composed of a first filling groove and a slit groove, a first dividing rib 8 exists between the first filling groove and the slit groove. The width L of the first dividing rib along the d-axis in the same layer, and the width M of the end of the first filling groove 51 arranged in the same layer as the first dividing rib at the end that connects with the first dividing rib 8, satisfy 0.2M < L < 0.35M between L and M. At the same time, the width K of the end of the slit groove 6 arranged in the same layer as the first dividing rib near the first dividing rib 8, satisfy K ≤ M between K and M. The presence of the first dividing rib of the present invention can enhance the mechanical strength of the rotor, enhance the safety and reliability of the motor, and at the same time limit the size range of the rib to prevent excessive magnetic leakage.

[0093] In some embodiments, the second filling groove 52 is composed of multiple non-connected grooves, and a second dividing rib 82 is provided between adjacent grooves. The second dividing rib 82 has an equal width structure or an unequal width structure. The equal width structure is a rectangle or parallelogram, etc., and the unequal width structure is a trapezoid. Preferably, a rectangular dividing rib in the equal width structure is selected. This arrangement can enhance the structural strength while minimizing magnetic leakage.

[0094] In some embodiments, the width h1 of the ribs between all the first filling grooves 51 and the second filling grooves 52 and the outer circle of the rotor, and the rib with the smallest width among the first dividing rib 8 and the second dividing rib 82, satisfies h1≥0.5*σ, where σ is the air gap width between the inner diameter of the motor stator and the outer diameter of the rotor. The dividing ribs in these areas on the rotor are mainly for enhancing the structural strength of the rotor and should not be set too small, otherwise there is a risk of rotor deformation during motor operation.

[0095] In some embodiments, the ratio of the length d1 of the first filling groove 51 located at both ends of the outermost slit groove 6 along the d-axis direction to the length d2 of the first filling groove 51 located at both ends of the adjacent slit groove 6 along the d-axis direction satisfies 0.2≤d1 / d2≤0.9, and more preferably 0.45≤d1 / d2≤0.65.

[0096] In some embodiments, the ratio of the length d1 of the first filling groove 51 located at both ends of the outermost slit groove 6 along the d-axis to the length d3 of the first filling groove 51 located at both ends of the innermost slit groove 6 along the d-axis satisfies 0.1≤d1 / d3≤0.7, more preferably 0.3≤d1 / d3≤0.5. Setting the length of the first filling groove along the d-axis within this range ensures that the area of ​​the first filling groove is neither too large nor too small. An excessively large area would lead to an increase in filling material, wasting filling material, while an excessively small area would affect the starting performance of the motor.

[0097] In some embodiments, the long sides of some or all of the two ends of the slit slot 6 are parallel to the d-axis; this arrangement can make full use of the space inside the rotor and allow for more slit slots to be arranged on the rotor.

[0098] The slit groove 6 includes at least one of a straight groove and an arc groove; when a portion of the slit groove is a combination of a straight groove and an arc groove, the slit groove is composed of a straight segment, an arc segment, and a straight segment, with the straight segment parallel to the d-axis and the arc segment protruding away from the shaft hole; when a portion of the slit groove is an arc groove, the arc segment protrudes away from the shaft hole; when a portion of the slit groove is a straight groove, the long side of the straight groove is set parallel to the d-axis and located at the position closest to the second filling groove (i.e., located between the second filling groove and the irregular groove); this setting can also ensure the space utilization rate on the rotor, and at the same time facilitate the smooth flow of the magnetic circuit structure on the rotor, thereby better utilizing the reluctance torque.

[0099] In some embodiments, the slit slot 6 is composed of arc segments and / or straight segments. From the rotor shaft hole side to the rotor outer circle side, the curvature of the arc segments of the slit slot 6 gradually increases, and the outer circle curvature of the same layer of slit slot 6 is greater than or equal to the inner circle curvature. With a shaft hole in the middle of the rotor, this slit slot arrangement increases the utilization rate of rotor space, improves the salient pole ratio of the rotor structure, and thus enhances the reluctance torque of the motor.

[0100] In some embodiments, the width of the slits in at least three layers of the slit slots 6 gradually decreases from the radially inner side to the radially outer side at their middle positions. This arrangement is for the purpose of rationally arranging the positions of the slits.

[0101] In some embodiments, the sum of the widths of all slit slots and the second filling slot 52 is ∑m2+m1, the radial width from the outer circle of the first shaft hole to the outer circumference of the rotor is m3, and ∑m2+m1 / m3 is 0.2 to 0.5, more preferably 0.3 to 0.4. The aim is to select a reasonable magnetic barrier ratio that ensures both sufficient magnetic barrier width and a reasonable magnetic flux channel, increasing the motor's saliency ratio while preventing magnetic circuit oversaturation and further reducing magnetic field harmonics.

[0102] In some embodiments, in the two innermost slit slots 6 located on both sides of the first shaft hole 7 on the first rotor lamination 4, the distance between the arcs of the two slots near the first shaft hole 7 along the q-axis is S3, the diameter of the first shaft hole 7 is d, and S3 / d is 1.2 to 1.3. Simultaneously, the inner arc diameter of the innermost slit slot is 1.5 to 3 times the diameter d of the first shaft hole 7. This arrangement ensures that there is a sufficient area for the magnetic conductive channel between the innermost slit slot and the shaft hole, thus preventing magnetic saturation in the magnetic conductive channel and ensuring that the rotor structural strength remains within a safe range.

[0103] In some embodiments, the distance between two adjacent first filling slots 51 on the first rotor lamination 4 is S1, satisfying S1≥S2, where S2 is the distance along the q-axis at any position of the two slit slots 6 opposite to the two adjacent first filling slots. This setting is also to ensure the unobstructed flow of the rotor magnetic channel and avoid saturation.

[0104] In some embodiments, the total area of ​​all the first and second filling slots accounts for 30% to 70% of the total area of ​​all rotor slots, wherein the rotor slots include the first filling slots, the second filling slots, and the slit slots, more preferably 35% to 50%. The purpose is to ensure a certain proportion of filling slot area so that the motor has a certain load-bearing starting capability.

[0105] In some embodiments, the angle α1 between the two ends of the second filling groove 52 and the line connecting the rotor center satisfies 20°≤α1≤60°; the second filling groove can act as a magnetic barrier layer, increasing the magnetic reluctance difference between the d and q axes of the motor, thereby increasing the magnetic reluctance torque of the motor.

[0106] The deviation of the inclination angle between the extension direction of the first filling groove and the d-axis does not exceed 5°, and the deviation of the inclination angle between the extension direction of the second filling groove 52 and the d-axis does not exceed 5°.

[0107] The distance between the midpoint of the first filling groove 51 of at least three layers and the midpoint of the first filling groove 51 of the adjacent outer layer gradually increases in the outward direction;

[0108] The width of the first filling groove 51 in the same layer deviates from the inside to the outside along the d-axis direction by no more than 5%;

[0109] The width of the first filling groove in at least three layers of the first filling groove 51 decreases continuously from the inside to the outside along the q-axis;

[0110] This design not only makes full use of the rotor space, resulting in a more uniform magnetic flux distribution on the rotor, but also reduces the amount of filler material used without affecting the starting capability, thereby reducing manufacturing costs.

[0111] Along the q-axis, the ratio between the width of at least three layers of the first filling groove from the inside out and the width of the slit groove at the middle position in the same layer is greater than 1.4, preferably between 1.5 and 3.0; along the q-axis, the area of ​​at least three layers of the first filling groove from the inside out gradually decreases, and the rate of decrease gradually increases, where the rate of decrease is defined as the ratio of the areas of two adjacent layers of the first filling groove.

[0112] This design takes into account the characteristics of the rotor magnetic circuit structure. The space in the middle area of ​​the slit slot is relatively small, so the width of the middle area of ​​the slit slot can be appropriately reduced. However, the space in the location of the first filling slot is relatively large, so the width of the first filling slot can be designed to be relatively large.

[0113] The first rotor lamination contains at least five different types of filling grooves.

[0114] In some embodiments, the first filling groove 51 is filled with a conductive but non-magnetic material, preferably aluminum or aluminum alloy. All filling grooves are self-short-circuited and connected 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 first filling groove 51.

[0115] Aluminum has good electrical conductivity and is relatively inexpensive, making it suitable for use in industrial motors. The self-short-circuiting squirrel cage structure provides asynchronous torque during the motor starting phase to enable self-starting of the motor.

[0116] Some or all of the second filling slots 52 are filled with air, which is blocked by the second rotor lamination 2 to prevent the filling of conductive but non-magnetic materials.

[0117] In some embodiments, magnetic channels exist between adjacent magnetic barrier layer structures, and the width at the end of all magnetic channels is greater than the width at the center of the magnetic channels, and no filling groove is provided in the middle area of ​​any magnetic channel; this is to ensure the unobstructed flow of the magnetic channels.

[0118] Along the q-axis, the width of at least three layers of magnetic channels gradually decreases from the inside out.

[0119] The width of any magnetic channel gradually increases from the middle to both sides. Here, the width of the magnetic channel is defined as the shortest distance from any point on one arc to another arc.

[0120] This design is also intended to ensure the smooth flow of the magnetic flux channel, thereby making full use of the reluctance torque.

[0121] The present invention also provides an electric motor comprising the rotor of a self-starting synchronous reluctance motor as described in any of the preceding claims.

[0122] This invention provides a rotor structure for a self-starting synchronous reluctance motor. The motor achieves self-starting through the asynchronous torque provided by the rotor bars, solving the problem that synchronous reluctance motors require frequency converter drive, while reducing motor losses and improving motor efficiency.

[0123] This invention provides a rotor structure for a self-starting synchronous reluctance motor, which can effectively reduce magnetic field harmonics during motor operation and improve the motor's torque ripple rate and vibration noise.

[0124] The combination of filling slots and slit slots enables the synchronous reluctance motor to start automatically, eliminating controller losses and improving motor efficiency.

[0125] By designing the shape and position of the slots and filling grooves on the first and second rotor laminations, magnetic field harmonics are effectively reduced, thereby avoiding torque pulsation and vibration noise problems caused by harmonics.

[0126] The mechanical strength of the rotor can be enhanced by the structural design of the second rotor lamination and the size design of the dividing ribs between the rotor filling groove and the slit groove.

[0127] The present invention also provides a compressor that includes the aforementioned motor.

[0128] The above description is merely a preferred embodiment of the present invention and is 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 description is only a preferred embodiment 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 self-starting synchronous reluctance motor rotor, characterized in that: The rotor core (1) includes a rotor core (1) and an end ring (3). The rotor core (1) includes a first rotor lamination (4) and a second rotor lamination (2). The first rotor lamination (4) is provided with a first filling groove (51), a second filling groove (52) and a slit groove (6). The first filling groove (51) and the slit groove (6) are arranged in the same layer. The second filling groove (52) is located on the outermost layer in the q-axis direction of the rotor and is not in the same layer as the slit groove (6). The second rotor lamination (2) can completely or partially cover the second filling groove (52) on the first rotor lamination (4). The second rotor lamination (2) is provided with a third filling groove (21), which is opposite to the first filling groove (51). The second rotor lamination (2) is provided with a fourth filling groove (22) or not provided with a fourth filling groove (22). When the fourth filling groove (22) is provided, the fourth filling groove (22) is opposite to the second filling groove (52) and the number of the fourth filling groove (22) is less than the number of the second filling groove (52) so as to partially cover the second filling groove (52). When the fourth filling groove (22) is not provided, the second rotor lamination (2) can completely cover the position of the second filling groove (52).

2. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The second filling groove (52) is composed of a single groove or multiple segmented grooves. When the second filling groove (52) is composed of a single groove, the second rotor lamination (2) is not provided with a fourth filling groove (22) at the position opposite to the second filling groove (52). When the second filling groove (52) is composed of multiple segmented grooves, the multiple segmented grooves are connected to form a whole, and the second rotor lamination (2) is not provided with a fourth filling groove or is provided with at least one fourth filling groove at the position opposite to the second filling groove (52). At least one of the fourth filling grooves (22) is partially opposite to or completely opposite to the second filling groove (52) so as to partially or completely block the second filling groove (52).

3. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The first rotor lamination (4) has a first shaft hole (7) at its center position, and the second rotor lamination (2) has a second shaft hole (20) at its center position. The second shaft hole (20) is positioned opposite to the first shaft hole (7).

4. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The first rotor lamination (4) and the second rotor lamination (2) are stacked together. The second rotor lamination (2) is located at both ends of the rotor core (1) in the axial direction, and the axial stack height of the second rotor lamination (2) at each end is not less than the thickness of a single first rotor lamination (4).

5. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The length, width, or area of ​​some or all of the filling slots on the second rotor lamination is not greater than the filling slots at the same position on the first rotor lamination. The filling slots on the second rotor lamination include the third filling slot and the fourth filling slot. The filling slots on the first rotor lamination include the first filling slot and the second filling slot.

6. The self-starting synchronous reluctance motor rotor according to claim 3, characterized in that: The maximum width of the outer contour of the second rotor lamination (2) is not greater than the diameter of the outer circle of the first rotor lamination (4). The second shaft hole (20) of the second rotor lamination (2) is elliptical in shape. The major axis of the ellipse is located on the q axis, the minor axis is located on the d axis, and the ratio of the length of the major axis to the length of the minor axis, k1 / k2, is in the range of 1.1-1.

5.

7. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The width kd of the second rotor lamination (2) on the d-axis is greater than its width kq on the q-axis, and 1.1≤kd / kq≤2.

8.

8. The self-starting synchronous reluctance motor rotor according to claim 3, characterized in that: Along the d-axis direction, the width distance from the inner edge of the second shaft hole (20) of the second rotor lamination (2) to the third filling groove (21) is more than 1 times the width distance of the first dividing rib (8) at the position of the first rotor lamination opposite to the inner edge. The first dividing rib (8) is located between the slit groove (6) and the first filling groove (51).

9. The self-starting synchronous reluctance motor rotor according to claim 3, characterized in that: The area of ​​the plurality of slits (6) in the region of the first rotor lamination (4) opposite to the second shaft hole (20) of the second rotor lamination (2) gradually decreases in the direction outward along the d-axis.

10. The self-starting synchronous reluctance motor rotor according to claim 3, characterized in that: The total area of ​​the plurality of slits (6) in the region of the first rotor lamination (4) opposite to the second shaft hole (20) of the second rotor lamination (2) accounts for at least 40% of the total area of ​​the motor flow holes; the total area of ​​the motor flow holes includes the sum of the area of ​​the stator flow holes and the area of ​​the rotor flow holes.

11. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The maximum width of the outer contour of the end ring (3) is not greater than the maximum width of the outer contour of the second rotor lamination (2), and the maximum distance from the center of the rotor core (1) to the end face of the end ring (3) along the axial direction is not less than the maximum distance from the center of the rotor core (1) to the end face of the second rotor lamination (2); and / or, The end ring (3) is a structure with unequal width, with its width md along the d-axis being greater than its width mq along the q-axis, and 1.1≤md / mq≤2.

8.

12. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: When the second rotor lamination (2) is not provided with the fourth filling groove (22), the first filling groove (51) on the first rotor lamination (4) and the slit groove (6) together form the multi-layer magnetic barrier layer structure of the rotor. When the second rotor lamination (2) is provided with a fourth filling groove (22), the first filling groove (51), the slit groove (6) and the second filling groove (52) on the first rotor lamination (4) together form a multi-layer magnetic barrier structure of the rotor.

13. The self-starting synchronous reluctance motor rotor according to claim 12, characterized in that: In each layer of the magnetic barrier layer structure composed of a first filling groove and a slit groove, there is a first dividing rib (8) between the first filling groove and the slit groove. The width L of the first dividing rib along the d-axis in the same layer, the width M of the end of the first filling groove (51) arranged in the same layer as the first dividing rib and connected to the first dividing rib (8), and L and M satisfy 0.2M < L < 0.35M. At the same time, the width K of the end of the slit groove (6) arranged in the same layer as the first dividing rib and close to the first dividing rib (8), and K and M satisfy K ≤ M.

14. The self-starting synchronous reluctance motor rotor according to claim 13, characterized in that: The second filling groove (52) is composed of multiple non-connected grooves, and there is a second dividing rib (82) between two adjacent grooves. The second dividing rib (82) is a structure of equal width or unequal width. The structure of equal width is a rectangle or a parallelogram, etc., and the structure of unequal width is a trapezoid.

15. The self-starting synchronous reluctance motor rotor according to claim 14, characterized in that: The width h1 of the ribs between the first filling groove (51) and the second filling groove (52) and the rotor outer circle, the rib with the smallest width among the first dividing rib (8) and the second dividing rib (82) satisfies h1≥0.5*σ, where σ is the air gap width between the inner diameter of the motor stator and the outer diameter of the rotor.

16. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The ratio of the length d1 of the first filling groove (51) located at both ends of the outermost slit groove (6) along the d-axis direction to the length d2 of the first filling groove (51) at both ends of the adjacent slit groove (6) along the d-axis direction satisfies 0.2≤d1 / d2≤0.

9.

17. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The ratio of the length d1 of the first filling groove (51) located at both ends of the outermost slit groove (6) along the d-axis direction to the length d3 of the first filling groove (51) located at both ends of the innermost slit groove (6) along the d-axis direction satisfies 0.1≤d1 / d3≤0.

7.

18. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The long sides of both ends of some or all of the slit groove (6) are parallel to the d-axis; the slit groove (6) includes at least one of a straight groove and an arc groove; when the slit groove is a combination of a straight groove and an arc groove, the slit groove is composed of a straight segment, an arc segment and a straight segment, and the straight segment is parallel to the d-axis, and the arc segment protrudes in a direction away from the shaft hole; when the slit groove is an arc groove, the arc segment protrudes in a direction away from the shaft hole; when the slit groove is a straight groove, the long side of the straight groove is set parallel to the d-axis and is located at the position closest to the second filling groove.

19. The self-starting synchronous reluctance motor rotor according to claim 18, characterized in that: The slit groove (6) is composed of arc segments and / or straight segments. From the rotor shaft hole side to the rotor outer circle side, the arc of the arc segment of the slit groove (6) gradually increases, and the outer arc arc of the slit groove (6) in the same layer is greater than or equal to the inner arc arc.

20. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The width of the slit groove at the middle position of at least 3 layers of the slit groove (6) gradually decreases from the radial inner side to the radial outer side.

21. The self-starting synchronous reluctance motor rotor according to claim 3, characterized in that: The sum of the widths of all the slits and the second filling groove (52) is ∑m2+m1, the radial width from the outer circle of the first shaft hole to the outer circumference of the rotor is m3, and (∑m2+m1) / m3 is 0.2~0.

5.

22. The self-starting synchronous reluctance motor rotor according to claim 3, characterized in that: In the two innermost slit grooves (6) on the first rotor lamination (4) located on both sides of the first shaft hole (7), the distance between the arcs of the two grooves near the first shaft hole (7) along the q-axis is S3, the diameter of the first shaft hole (7) is d, and S3 / d is 1.2~1.

3. At the same time, the inner arc diameter of the innermost slit groove is 1.5-3 times the diameter d of the first shaft hole (7).

23. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The distance between two adjacent first filling slots (51) on the first rotor lamination (4) is S1, which satisfies S1≥S2, where S2 is the distance along the q-axis at any position of the two slit slots (6) opposite to the two adjacent first filling slots.

24. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The total area of ​​all the first filling slots and the second filling slots accounts for 30% to 70% of the total area of ​​all rotor slots, and the rotor slots include the first filling slots, the second filling slots and the slit slots.

25. The rotor of the self-starting synchronous reluctance motor according to any one of claims 1-24, characterized in that: The angle α1 between the two ends of the second filling groove (52) and the center of the rotor satisfies 20°≤α1≤60°; The deviation of the inclination angle between the extension direction of the first filling groove and the d-axis does not exceed 5°, and the deviation of the inclination angle between the extension direction of the second filling groove (52) and the d-axis does not exceed 5°. The distance between the midpoint of the first filling groove (51) of at least three layers and the midpoint of the first filling groove (51) of the adjacent outer layer gradually increases in the outward direction; The width of the first filling groove (51) in the same layer deviates by no more than 5% from the inside to the outside along the d-axis direction; The width of the first filling groove in at least three layers of the first filling groove (51) decreases continuously from the inside to the outside along the direction of the q axis; Along the q-axis, from the inside out, there are at least three layers of the first filling groove. The ratio between the width of each layer and the width of the slit groove at the middle position is greater than 1.

4. Along the q-axis, from the inside out, the area of ​​at least three layers of first filling grooves gradually decreases, and the rate of decrease gradually increases. Here, the rate of decrease is defined as the ratio of the areas of two adjacent layers of first filling grooves. The first rotor lamination contains at least five different types of filling grooves.

26. The rotor of the self-starting synchronous reluctance motor according to any one of claims 1-24, characterized in that: The first filling groove (51) is filled with a conductive but non-magnetic material. All filling grooves are connected by self-short-circuiting through the 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 first filling groove (51). Some or all of the second filling slots (52) are filled with air, which is blocked by the second rotor lamination (2) to prevent the filling of conductive but non-magnetic material.

27. The self-starting synchronous reluctance motor rotor according to claim 12, characterized in that: There are magnetic channels between two adjacent magnetic barrier layer structures. The width of the end of all magnetic channels is greater than the width of the center of the magnetic channels, and no filling groove is provided in the middle area of ​​any magnetic channel. Along the q-axis, the width of at least three layers of magnetic channels gradually decreases from the inside out. The width of any magnetic channel gradually increases from the middle to both sides. Here, the width of the magnetic channel is defined as the shortest distance from any point on one arc to another arc.

28. An electric motor, characterized in that, The rotor of the self-starting synchronous reluctance motor included in any one of claims 1-27.

29. A compressor, characterized in that, Includes the motor as described in claim 28.

Images