Motor rotor and self-starting synchronous reluctance motor

Abstract

The present application provides a motor rotor and a self-starting synchronous reluctance motor. The motor rotor comprises a rotor core (1), a filling slot and a slit slot (2), wherein the filling slot and the slit slot (2) are both provided on the rotor core (1), the filling slot comprises a non-independent filling slot (3), one non-independent filling slot (3) is provided corresponding to one slit slot (2), and the non-independent filling slot (3) is provided on a side of the corresponding slit slot (2) away from or close to the central axis of the rotor core (1), and is connected to the corresponding slit slot (2). According to the motor rotor of the present application, the area of ​​the filling slot can be increased, the resistance of the filling slot can be reduced, the pull-in torque of the motor can be increased, and the ability of the motor to pull in synchronization can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a motor rotor and a self-starting synchronous reluctance motor. Background Art

[0002] Based on the synchronous reluctance motor, the self-starting synchronous reluctance motor combines the advantages of the asynchronous motor, and realizes self-starting through the asynchronous torque generated by the rotor bars, and no longer needs to be driven by a frequency converter. Compared with the asynchronous motor, the motor can achieve constant speed operation, low rotor loss, and improved efficiency during synchronous operation; compared with the asynchronous starting permanent magnet synchronous motor, the motor does not use permanent magnet materials, has low cost, and does not have the problem of permanent magnet demagnetization.

[0003] However, the self-starting synchronous reluctance motor in the related art has a small rotor slot filling area, a small pull-in torque, and a poor pull-in synchronization capability while ensuring the starting capability. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present application is to provide a motor rotor and a self-starting synchronous reluctance motor, which can increase the area of ​​the filling slot, reduce the resistance of the filling slot, increase the motor's pull-in torque, and improve the motor's ability to pull in synchronization.

[0005] In order to solve the above problems, the present application provides a motor rotor, including a rotor core, a filling slot and a slit slot, the filling slot and the slit slot are both opened on the rotor core, the filling slot includes a non-independent filling slot, one non-independent filling slot corresponds to one slit slot, the non-independent filling slot is arranged on the side of the corresponding slit slot away from or close to the central axis of the rotor core, and is connected to the corresponding slit slot.

[0006] Preferably, the interconnected non-independent filling slots and slit slots form a magnetic barrier layer, there are at least two slit slots and at least two non-independent filling slots, and at least two slit slots and at least two non-independent filling slots are arranged along the q-axis direction of the motor rotor to form a multi-layer magnetic barrier layer.

[0007] Preferably, in a cross section perpendicular to the central axis of the rotor core, the total area of ​​the slit slots is 40% to 80% of the total area of ​​the slit slots and the filling slots.

[0008] Preferably, the total area of ​​the slit grooves is 50% to 70% of the total area of ​​the slit grooves and the filling grooves.

[0009] Preferably, the total area of ​​the slit grooves is 55% to 65% of the total area of ​​the slit grooves and the filling grooves.

[0010] Preferably, the non-independent filling slots and the slit slots both extend from both sides of the q-axis along the d-axis direction toward the outer circle of the rotor core, and there is no obstruction between the non-independent filling slots and the slit slots.

[0011] Preferably, the interconnected non-independent filling grooves and slit grooves form a magnetic barrier layer, and the magnetic barrier layer is provided with dividing ribs, which divide the magnetic barrier layer into at least two sections along the d-axis direction.

[0012] Preferably, the magnetic barrier layer is at least two layers. On the cross section perpendicular to the central axis of the rotor core, the width of the dividing ribs of the outermost magnetic barrier layer close to the outer circle of the rotor is L1, and the width of the dividing ribs of the innermost magnetic barrier layer close to the shaft hole is L2, L1≥L2, and L1≥0.5*δ, where δ is the air gap width between the stator and the rotor.

[0013] Preferably, the interval between the innermost magnetic barrier layer close to the shaft hole and the outer circle of the rotor is L3, and the interval between the outermost magnetic barrier layer close to the outer circle of the rotor and the outer circle of the rotor is L4, L4≥L3, 0≤L4≤2.5*δ, δ is the air gap width between the stator and the rotor.

[0014] Preferably, the interconnected non-independent filling grooves and slit grooves form a magnetic barrier layer, and the magnetic barrier layer includes arc segments and / or straight line segments.

[0015] Preferably, when the magnetic barrier layer includes arc segments, the curvature of the arc segments gradually increases along the direction from the rotor shaft hole to the outer circle of the rotor, and the curvature of the outer circle of the magnetic barrier layer of the same layer is greater than the curvature of the inner circle.

[0016] Preferably, when the magnetic barrier layer comprises arc segments, the widths of the arc segments gradually increase from the q-axis in an outward direction along the d-axis.

[0017] Preferably, when the magnetic barrier layer further includes straight line segments, the straight line segments are located on both sides of the arc segment.

[0018] Preferably, when the magnetic barrier layer includes arc segments, the width of the magnetic conductive channel between adjacent arc segments increases gradually from the q-axis in an outward direction along the d-axis.

[0019] Preferably, the ratio of the sum of the widths of the magnetic barrier layers Σm1 to the width m2 from the shaft hole to the outer circle of the rotor core is in the range of 0.4 to 0.6.

[0020] Preferably, the minimum width of the magnetic channel between two adjacent magnetic barrier layers along the q-axis direction is h1, and the minimum width of the magnetic barrier layer with a smaller width among the two adjacent magnetic barrier layers along the q-axis direction is h2, and h1≥0.7h2.

[0021] Preferably, the filling groove further includes an independent filling groove, and along the q-axis direction, the independent filling groove is located outside the non-independent filling groove, and the independent filling groove independently forms a magnetic barrier layer.

[0022] Preferably, in a cross section perpendicular to the central axis of the rotor core, an angle α1 formed by a line connecting two ends of the independent filling slot and the central axis of the rotor core satisfies 20°≤α1≤60°.

[0023] Preferably, 30°≤α1≤50°.

[0024] Preferably, the rotor core comprises an axial hole, and a maximum width of the axial hole in the q-axis direction is less than or equal to a maximum width of the axial hole in the d-axis direction.

[0025] Preferably, the axial hole consists of arc segments and / or straight line segments.

[0026] Preferably, at least a portion of the filling slot is filled with an electrically conductive but non-magnetic material.

[0027] According to another aspect of the present application, a self-starting synchronous reluctance motor is provided, comprising a motor rotor, which is the motor rotor described above.

[0028] The motor rotor provided by the present application includes a rotor core, a filling slot and a slit slot, both of which are provided on the rotor core, and the filling slot includes a non-independent filling slot, one non-independent filling slot is provided corresponding to one slit slot, and the non-independent filling slot is provided on the side of the corresponding slit slot away from or close to the central axis of the rotor core, and is connected with the corresponding slit slot. The non-independent filling slot of the motor rotor is connected with the slit slot to form a magnetic barrier layer, and the non-independent filling slot is located on the side of the slit slot away from or close to the central axis of the rotor core, which can greatly increase the length of the non-independent filling slot along the d-axis direction, increase the area of ​​the filling slot, and reduce the resistance of the filling slot. The smaller filling slot resistance helps to increase the pull-in torque of the motor and improve the ability of the motor to pull in synchronization; in addition, the slit slot and the non-independent filling slot are connected along the q-axis direction to form the magnetic barrier layer of the rotor, which can increase the width of the rotor magnetic barrier layer along the q-axis direction, increase the motor salient pole difference, and improve the motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of a motor rotor according to an embodiment of the present application;

[0030] Figure 2 This is a comparison chart of the efficiency of a motor according to an embodiment of the present application and a motor in related technology;

[0031] Figure 3 A comparison diagram of current, loss, and temperature rise of a motor according to an embodiment of the present application and a motor of the related art at a rated point;

[0032] Figure 4 A comparison diagram of the speeds of a motor according to an embodiment of the present application and a motor in related technology during the starting process.

[0033] The reference numerals are:

[0034] 1. Rotor core; 2. Slit slot; 3. Non-independent filling slot; 4. Independent filling slot; 5. Splitting rib; 6. Shaft hole; 7. Magnetic channel. DETAILED DESCRIPTION

[0035] See also Figures 1 to 4 As shown, according to an embodiment of the present application, the motor rotor includes a rotor core 1, a filling slot and a slit slot 2, the filling slot and the slit slot 2 are both opened on the rotor core 1, the filling slot includes a non-independent filling slot 3, one non-independent filling slot 3 is arranged corresponding to one slit slot 2, the non-independent filling slot 3 is arranged on the side of the corresponding slit slot 2 away from or close to the central axis of the rotor core 1, and is connected to the corresponding slit slot 2.

[0036] The non-independent filling slot 3 of the motor rotor is connected with the slit slot 2 to form a magnetic barrier layer, and the non-independent filling slot 3 is located on the side of the slit slot 2 away from or close to the central axis of the rotor core 1, which can greatly increase the length of the non-independent filling slot 3 along the d-axis direction, increase the area of ​​the filling slot, and reduce the resistance of the filling slot. The smaller filling slot resistance helps to increase the motor's pull-in torque and improve the motor's ability to pull in synchronization; in addition, the slit slot 2 and the non-independent filling slot 3 are connected along the q-axis direction to form the rotor's magnetic barrier layer, which can increase the width of the rotor's magnetic barrier layer along the q-axis direction, increase the motor's salient pole difference, and improve the motor's efficiency.

[0037] In one embodiment, the interconnected non-independent filling slots 3 and the slit slots 2 form a magnetic barrier layer, there are at least two slit slots 2, there are at least two non-independent filling slots 3, and at least two slit slots 2 and at least two non-independent filling slots 3 are arranged along the q-axis direction of the motor rotor to form a multi-layer magnetic barrier layer. In this embodiment, since the non-independent filling slots 3 and the slit slots 2 together form a magnetic barrier layer along the q-axis direction, it is possible to increase the length of the non-independent filling slots 3 along the d-axis direction while increasing the width of the magnetic barrier layer along the q-axis direction. The multi-layer magnetic barrier layer can further increase the width of the rotor magnetic barrier layer along the q-axis direction, increase the motor salient pole difference, and improve the motor efficiency.

[0038] In addition, since the setting position of the non-independent filling slot 3 is optimized, it is not set on both sides of the slit slot 2 along the d-axis direction, but is set on the outside or inside of the slit slot 2 along the q-axis direction. Therefore, the slit slot 2 can extend outward along the d-axis direction to a position close to the outer circle of the rotor, so that the slit slot 2 can be evenly distributed along the d-axis direction, thereby increasing the flow area of ​​the slit slot 2, improving the heat dissipation efficiency of the rotor core 1, and being more conducive to uniform heat dissipation of the rotor core 1.

[0039] In one embodiment, in a cross section perpendicular to the central axis of the rotor core 1 , the total area of ​​the slit slots 2 is 40% to 80% of the total area of ​​the slit slots 2 and the filling slots.

[0040] Preferably, the total area of ​​the slit grooves 2 is 50% to 70% of the total area of ​​the slit grooves 2 and the filling grooves.

[0041] More preferably, the total area of ​​the slit groove 2 is 55% to 65% of the total area of ​​the slit groove 2 and the filling groove.

[0042] By limiting the ratio of the total area of ​​the slit slots 2 to the total area of ​​the magnetic barrier layer, the flow area of ​​the air flow channel on the rotor core 1 can be ensured, which helps to improve the heat dissipation of the rotor.

[0043] In one embodiment, both the non-independent filling slot 3 and the slit slot 2 extend from both sides of the q-axis along the d-axis direction toward the rotor outer circle of the rotor core 1, and there is no barrier between the non-independent filling slot 3 and the slit slot 2. In this embodiment, before the conductive non-magnetic conductive material is filled, the non-independent filling slot 3 and the slit slot 2 form a complete magnetic barrier slot, the interior of the magnetic barrier slot is completely hollow, and no partition structure is set. The non-independent filling slot 3 and the slit slot 2 are distinguished by filling the conductive non-magnetic conductive material in the non-independent filling slot 3. The side of the conductive non-magnetic conductive material facing the slit slot 2 forms the interface between the non-independent filling slot 3 and the slit slot 2. When the conductive non-magnetic conductive material is removed, the non-independent filling slot 3 and the slit slot 2 are completely connected along the length direction from the first end to the second end. Therefore, the magnetic barrier slot formed by the non-independent filling slot 3 and the slit slot 2 can be directly processed without other processing, and then the non-independent filling slot 3 and the slit slot 2 are divided by filling the conductive non-magnetic conductive material.

[0044] In one embodiment, the interconnected non-independent filling slots 3 and the slit slots 2 form a magnetic barrier layer, and the magnetic barrier layer is provided with a dividing rib 5, and the dividing rib 5 divides the magnetic barrier layer into at least two sections along the d-axis direction. In this embodiment, since both the non-independent filling slots 3 and the slit slots 2 extend from the q-axis along the d-axis direction to the outer circle of the rotor, the mechanical strength of the rotor core 1 will be reduced. By providing the dividing rib 5, the magnetic barrier layer can be segmented, the length of the magnetic barrier layer can be shortened, and the connection between adjacent magnetic conductive channels 7 can be achieved, thereby effectively enhancing the mechanical strength of the rotor core 1.

[0045] In one embodiment, the magnetic barrier layer is at least two layers. On a cross section perpendicular to the central axis of the rotor core 1, the width of the dividing rib 5 of the outermost magnetic barrier layer close to the outer circle of the rotor is L1, and the width of the dividing rib 5 of the innermost magnetic barrier layer close to the shaft hole 6 is L2, L1≥L2, and L1≥0.5*δ, δ is the air gap width between the stator and the rotor. In this embodiment, the air gap width between the stator and the rotor can be used to limit the minimum width of the dividing rib, thereby reducing the difficulty of processing and improving the mechanical strength of the rotor core 1. In addition, by limiting the relationship between the widths of the innermost and outermost dividing ribs 5 of the rotor core 1, the leakage of the inner magnetic barrier layer can be effectively reduced, and the motor efficiency can be improved.

[0046] In one embodiment, the dividing rib 5 extends along the q-axis direction, and the planes on which the two side surfaces of the dividing rib 5 are located are parallel to or intersect with the plane on which the q-axis is located. When the dividing rib 5 is a rectangle, the planes on which the two side surfaces of the dividing rib 5 are located are parallel to the plane on which the q-axis is located. When the dividing rib 5 is a parallelogram or a trapezoid, the planes on which the two side surfaces of the dividing rib 5 are located intersect with the plane on which the q-axis is located.

[0047] In one embodiment, the interval between the innermost magnetic barrier layer near the shaft hole 6 and the outer circle of the rotor is L3, and the interval between the outermost magnetic barrier layer near the outer circle of the rotor and the outer circle of the rotor is L4, L4≥L3, 0≤L4≤2.5*δ, δ is the air gap width between the stator and the rotor. 0≤L4≤2.5δ, that is, the filling slot is an open slot or a closed slot. When the filling slot is a closed slot, the maximum interval between it and the outer circle of the rotor is limited, which can reduce the leakage flux; L4≥L3, which can reduce the leakage flux of the inner magnetic barrier layer, while ensuring the mechanical strength of the outer magnetic barrier layer.

[0048] In one embodiment, the interconnected non-independent filling slots 3 and the slit slots 2 form a magnetic barrier layer, and the magnetic barrier layer includes arc segments and / or straight line segments.

[0049] In one embodiment, when the magnetic barrier layer includes arc segments, the curvature of the arc segments gradually increases along the direction from the rotor shaft hole 6 to the outer circle of the rotor, and the curvature of the outer circle of the magnetic barrier layer of the same layer is greater than the curvature of the inner circle.

[0050] In one embodiment, when the magnetic barrier layer includes arc segments, the widths of the arc segments gradually increase starting from the q-axis and moving outward along the d-axis.

[0051] Since the rotor core 1 has an axial hole 6 in the middle, the arc segment arrangement of the magnetic barrier layer can increase the utilization of the rotor space and reasonably arrange the slit slots 2 to increase the rotor salient pole ratio and improve the motor reluctance torque.

[0052] In one embodiment, when the magnetic barrier layer further includes straight line segments, the straight line segments are located on both sides of the arc segment, and the widths of the straight line segments are constant.

[0053] In one embodiment, when the magnetic barrier layer includes arc segments, the width of the magnetic channel 7 between adjacent arc segments increases from the q axis to the outward direction along the d axis. Due to the existence of the intermediate shaft hole 6, when the magnetic channel 7 and the magnetic barrier layer are outward along the d axis, as the width of the shaft hole in the q axis direction becomes smaller, the available width of the magnetic channel 7 and the magnetic barrier layer in the q axis direction gradually increases. At this time, in the direction outward along the d axis direction, the width of the magnetic channel 7 and the magnetic barrier layer on the q axis increases, which can make the structure of the rotor core more fully utilized, and at the same time, the width setting of the magnetic channel 7 and the magnetic barrier layer can be more reasonable, and the change of the magnetic circuit width can be more reasonable, which can ensure that the rotor magnetic channel has enough width near the air gap, avoid magnetic field saturation, affect the magnetic flux flow of the channel between the magnetic barrier layers, and improve the performance of the motor.

[0054] In one embodiment, the ratio of the sum of the widths of the magnetic barrier layers ∑m1 to the width m2 from the shaft hole 6 to the outer circle of the rotor core 1 is in the range of 0.4 to 0.6, so that a reasonable magnetic barrier ratio can be selected to ensure both sufficient magnetic barrier width and a reasonable magnetic flux channel, thereby increasing the motor salient pole ratio and preventing magnetic circuit oversaturation.

[0055] In one embodiment, the minimum width of the magnetic channel 7 between two adjacent magnetic barrier layers along the q-axis direction is h1, and the minimum width of the magnetic barrier layer with a smaller width among the two adjacent magnetic barrier layers along the q-axis direction is h2, and h1≥0.7h2. This arrangement can reduce the difficulty of rotor processing and ensure the uniformity and unsaturation of the rotor magnetic flux distribution.

[0056] In one embodiment, the filling slot further includes an independent filling slot 4. Along the q-axis direction, the independent filling slot 4 is located outside the non-independent filling slot 3, and the independent filling slot 4 forms a magnetic barrier layer alone. The difference between the independent filling slot 4 and the non-independent filling slot 3 is that the independent filling slot 4 forms a magnetic barrier layer alone, while the non-independent filling slot 3 cooperates with the slit slot 2 to form a magnetic barrier layer.

[0057] In one embodiment, in a cross section perpendicular to the central axis of the rotor core 1 , an angle α1 formed by a line connecting two ends of the independent filling slot 4 and the central axis of the rotor core 1 satisfies 20°≤α1≤60°.

[0058] Preferably, 30°≤α1≤50°.

[0059] Further preferably, 30°≤α1≤35°. With such an arrangement, the independent filling slot 4 can form a magnetic barrier layer and serve as a filling slot, which can be used as a magnetic barrier layer to increase the magnetic resistance torque of the motor, and can also be used as a starting cage to improve the starting performance of the motor.

[0060] In one embodiment, the rotor core 1 includes an axial hole 6, and the maximum width of the axial hole 6 in the q-axis direction is less than or equal to the maximum width of the axial hole 6 in the d-axis direction. Since the slit slots 2 are arranged in the q-axis direction, such an arrangement can increase the width of the rotor core 1 in the q-axis direction, increase the utilization rate of the rotor space, and reasonably arrange the slit slots 2, thereby increasing the rotor salient pole ratio and improving the motor reluctance torque.

[0061] In one embodiment, the shaft hole 6 is composed of arc segments and / or straight line segments. For example, the shaft hole 6 can be a circular hole, an elliptical hole, a polygonal hole, or a waist-shaped hole.

[0062] In one embodiment, at least a portion of the filling groove is filled with an electrically conductive but non-magnetic material.

[0063] In one embodiment, the filling slots are self-short-circuited through end rings at both ends of the rotor to form a squirrel cage structure, and the end ring material is the same as the filling material in the filling slot. The self-short-circuited squirrel cage structure provides asynchronous torque during the motor starting stage to achieve self-starting of the motor; the multi-layer magnetic barrier layer structure provides magnetic resistance torque for the motor to achieve synchronous operation of the motor.

[0064] See also Figure 2 As shown, from the comparison between the motor of the embodiment of the present application and the motor of the related technology, it can be seen that after adopting the motor of the embodiment of the present application, the motor efficiency is improved by at least 0.3% under the same torque.

[0065] See also Figure 3 As shown, by comparing the motor of the embodiment of the present application with the motor of the related art, it can be seen that after adopting the motor of the embodiment of the present application, the current is effectively reduced, the iron loss, aluminum loss and copper loss are significantly reduced, especially the copper loss is more significantly reduced, the motor performance is significantly improved, and the temperature rise of the motor is significantly reduced. The rated point in the figure refers to the rated torque point, and the output power at the rated point is the rated power.

[0066] See also Figure 4 As shown, from the comparison between the motor of the embodiment of the present application and the motor of the related technology, it can be seen that after adopting the motor of the embodiment of the present application, the motor can be successfully pulled into synchronization and run stably, and the motor's ability to pull into synchronization is improved.

[0067] According to an embodiment of the present application, a self-starting synchronous reluctance motor includes a motor rotor, which is the motor rotor described above.

[0068] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0069] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A self-starting synchronous reluctance motor, characterized in that: The invention comprises a rotor core (1), a filling slot and a slit slot (2), wherein the filling slot and the slit slot (2) are both provided on the rotor core (1), the filling slot comprises a non-independent filling slot (3), one non-independent filling slot (3) is provided corresponding to one slit slot (2), the non-independent filling slot (3) is provided on a side of the corresponding slit slot (2) away from or close to the central axis of the rotor core (1), and is connected to the corresponding slit slot (2); at least part of the filling slot is filled with a conductive non-magnetic material; the non-independent filling slot (3) and the slit slot (2) both extend from both sides of the q-axis along the d-axis direction toward the outer circle of the rotor core (1), there is no barrier between the non-independent filling slot (3) and the slit slot (2), and the non-independent filling slot (3) and the slit slot (2) are completely connected along the length direction from the first end to the second end.

2. The self-starting synchronous reluctance motor according to claim 1, characterized in that: The non-independent filling slots (3) and the slit slots (2) that are interconnected form a magnetic barrier layer, there are at least two slit slots (2), there are at least two non-independent filling slots (3), and at least two slit slots (2) and at least two non-independent filling slots (3) are arranged along the q-axis direction of the motor rotor to form a multi-layer magnetic barrier layer.

3. The self-starting synchronous reluctance motor according to claim 1, characterized in that: In a cross section perpendicular to the central axis of the rotor core (1), the total area of ​​the slit slots (2) is 40% to 80% of the total area of ​​the slit slots (2) and the filling slots.

4. The self-starting synchronous reluctance motor according to claim 3, characterized in that: The total area of ​​the slit groove (2) is 50% to 70% of the total area of ​​the slit groove (2) and the filling groove.

5. The self-starting synchronous reluctance motor according to claim 4, characterized in that: The total area of ​​the slit groove (2) is 55% to 65% of the total area of ​​the slit groove (2) and the filling groove.

6. The self-starting synchronous reluctance motor according to claim 1, characterized in that: The non-independent filling grooves (3) and the slit grooves (2) that are interconnected form a magnetic barrier layer, and the magnetic barrier layer is provided with dividing ribs (5), and the dividing ribs (5) divide the magnetic barrier layer into at least two sections along the d-axis direction.

7. The self-starting synchronous reluctance motor according to claim 6, characterized in that: The magnetic barrier layer has at least two layers. On a cross section perpendicular to the central axis of the rotor core (1), the width of the dividing ribs (5) of the outermost magnetic barrier layer close to the outer circle of the rotor is L1, and the width of the dividing ribs (5) of the innermost magnetic barrier layer close to the shaft hole (6) is L2, L1≥L2, and L1≥0.5*δ, δ being the width of the air gap between the stator and the rotor.

8. The self-starting synchronous reluctance motor according to claim 2, characterized in that: The distance between the innermost magnetic barrier layer close to the shaft hole (6) and the outer circle of the rotor is L3, and the distance between the outermost magnetic barrier layer close to the outer circle of the rotor and the outer circle of the rotor is L4, L4≥L3, 0≤L4≤2.5*δ, δ is the air gap width between the stator and the rotor.

9. The self-starting synchronous reluctance motor according to claim 1, characterized in that: The non-independent filling grooves (3) and the slit grooves (2) that are interconnected form a magnetic barrier layer, and the magnetic barrier layer includes arc segments and / or straight line segments.

10. The self-starting synchronous reluctance motor according to claim 9, characterized in that: When the magnetic barrier layer includes arc segments, the curvature of the arc segments gradually increases along the direction from the rotor shaft hole (6) to the outer circle of the rotor, and the curvature of the outer circle of the magnetic barrier layer in the same layer is greater than the curvature of the inner circle.

11. The self-starting synchronous reluctance motor according to claim 9, characterized in that: When the magnetic barrier layer includes arc segments, the widths of the arc segments gradually increase from the q-axis to the outward direction along the d-axis.

12. The self-starting synchronous reluctance motor according to any one of claims 10 to 11, characterized in that: When the magnetic barrier layer further includes straight line segments, the straight line segments are located on both sides of the arc segment.

13. The self-starting synchronous reluctance motor according to claim 9, characterized in that: When the magnetic barrier layer comprises arc segments, the width of the magnetic conductive channel (7) between adjacent arc segments increases gradually from the q axis in an outward direction along the d axis.

14. The self-starting synchronous reluctance motor according to claim 2, characterized in that: The ratio of the sum of the widths of the magnetic barrier layers Σm1 to the width m2 from the shaft hole (6) to the outer circle of the rotor core (1) is in the range of 0.4 to 0.

6.

15. The motor rotor according to claim 2, characterized in that: The minimum width of the magnetic channel (7) between two adjacent magnetic barrier layers along the q-axis direction is h1, and the minimum width of the magnetic barrier layer with a smaller width among the two adjacent magnetic barrier layers along the q-axis direction is h2, and h1≥0.7h2.

16. The self-starting synchronous reluctance motor according to claim 1, characterized in that: The filling groove further comprises an independent filling groove (4), wherein the independent filling groove (4) is located outside the non-independent filling groove (3) along the q-axis direction, and the independent filling groove (4) independently forms a magnetic barrier layer.

17. The self-starting synchronous reluctance motor according to claim 16, characterized in that: In a cross section perpendicular to the central axis of the rotor core (1), an angle α1 formed by a line connecting two ends of the independent filling slot (4) and the central axis of the rotor core (1) satisfies 20°≤α1≤60°.

18. The self-starting synchronous reluctance motor according to claim 17, characterized in that: 30°≤α1≤50°。 19. The self-starting synchronous reluctance motor according to claim 1, characterized in that: The rotor core (1) comprises an axial hole (6), wherein the maximum width of the axial hole (6) in the q-axis direction is less than or equal to the maximum width of the axial hole (6) in the d-axis direction.

20. The self-starting synchronous reluctance motor according to claim 19, characterized in that: The axial hole (6) is composed of arc segments and / or straight line segments.

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