Motor rotor and self-starting synchronous reluctance motor

Abstract

The application provides a motor rotor and a self-starting synchronous reluctance motor. The motor rotor comprises a rotor core (1), and the rotor core (1) is provided with filling grooves and slit grooves (2). The filling grooves comprise non-independent filling grooves (3) and q-axis filling grooves (4). The non-independent filling grooves (3) are separated from the slit grooves in the same layer by a separation rib (5). The width of the separation rib (5) in the d-axis direction is L. The width of the end of the filling groove arranged in the same layer as the separation rib (5) close to the separation rib (5) is M. The relationship between L and M satisfies 0.2M≤L≤0.35M. Meanwhile, the width of the end of the slit groove (2) arranged in the same layer as the separation rib (5) close to the separation rib (5) is K, and K satisfies K≤M. According to the motor rotor, the mechanical strength of the rotor can be enhanced, the deformation of the rotor in the manufacturing process can be reduced, and the difficulty of the process manufacturing is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine rotor and a self-starting synchronous reluctance electric machine. BACKGROUND

[0002] The self-starting synchronous reluctance electric machine combines the advantages of the asynchronous electric machine on the basis of the synchronous reluctance electric machine, and realizes self-starting through the asynchronous torque generated by the rotor bar, without the need to use a frequency converter for driving. Compared with the asynchronous electric machine, the electric machine can realize constant-speed operation, the rotor loss is low, and the efficiency is improved during synchronous operation; compared with the asynchronous-starting permanent-magnet synchronous electric machine, the electric machine does not use permanent-magnet materials, has low cost, and does not have the problem of permanent-magnet demagnetization.

[0003] However, the rotor structure of the self-starting synchronous reluctance electric machine is composed of multiple magnetic barrier layers, which causes the rotor to be prone to deformation during the manufacturing process of the electric machine, increasing the difficulty of process manufacturing. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to provide an electric machine rotor and a self-starting synchronous reluctance electric machine, which can enhance the mechanical strength of the rotor, reduce the deformation of the rotor during the manufacturing process, and reduce the difficulty of process manufacturing.

[0005] In order to solve the above problems, the present application provides an electric machine rotor, which comprises a rotor core, the rotor core is provided with filling grooves and slit grooves, the filling grooves comprise non-independent filling grooves and q-axis filling grooves, the non-independent filling grooves are arranged on both sides of the slit grooves, the q-axis filling grooves are arranged on one side of the outer circle of the rotor close to the q-axis, the non-independent filling grooves and the slit grooves in the same layer are separated by a partition rib, the width of the partition rib along the d-axis direction is L, the width of the end of the filling groove arranged in the same layer as the partition rib close to the partition rib is M, and 0.2M≤L≤0.35M is satisfied between L and M, and the width K of the end of the slit groove arranged in the same layer as the partition rib close to the partition rib should satisfy K≤M.

[0006] Preferably, the slit groove comprises an arc segment and / or a straight line segment, when the slit groove comprises an arc segment, the arc of the arc segment gradually increases along the direction from the rotor shaft hole to the outer circle of the rotor, and the outer circle arc of the slit groove in the same layer is greater than the inner circle arc.

[0007] Preferably, the slit groove comprises an arc segment and / or a straight line segment, and the width of the slit groove in the q-axis direction increases along the direction from the q-axis to both sides.

[0008] Preferably, the sum of the widths of the q-axis filling grooves and the slit grooves in the q-axis direction is m1+∑m2, the width from the rotor shaft hole to the outer circle of the rotor is m3, and (m1+∑m2) / m3=0.3~0.5.

[0009] Preferably, (m1+∑m2) / m3=0.35~0.45.

[0010] Preferably, the minimum width of the magnetic flux channel between two adjacent non-independent filling slots is W, and the minimum width of the magnetic flux channel between the slot slots in the same layer as the two non-independent filling slots is d, W≥d.

[0011] Preferably, the total area of the filling slots accounts for 30%~70% of the sum of the areas of the filling slots and the slot slots.

[0012] Preferably, the total area of the filling slots accounts for 30%~70% of the sum of the areas of the filling slots and the slot slots.

[0013] Preferably, in the cross section perpendicular to the central axis of the rotor core, the angle α1 formed by the line connecting the two ends of the q-axis filling slot and the central axis of the rotor core satisfies 20°≤α1≤60°.

[0014] Preferably, the non-independent filling slot and the slot slot in the same layer form a magnetic barrier layer, the q-axis filling slot forms a magnetic barrier layer, and the minimum distance h1 between the magnetic barrier layer and the outer circle of the rotor satisfies h1≥σ, σ is the width of the air gap between the stator and the rotor.

[0015] Preferably, the non-independent filling slot and the slot slot in the same layer form a magnetic barrier layer, the q-axis filling slot forms a magnetic barrier layer, and the minimum width of the magnetic flux channel between the adjacent two layers of magnetic barrier layers in the q-axis direction is h3, the minimum width of the magnetic barrier layer with smaller width in the d-axis direction among the adjacent two layers of magnetic barrier layers is h2, h3≥1.5h2.

[0016] Preferably, the q-axis filling slot under the same pole is of segmented structure, and the slot segments of the adjacent two q-axis filling slots have a partitioning rib.

[0017] Preferably, the width of the partitioning rib between the adjacent two slot segments in the d-axis direction is x1, x1>0.1s1, x1>0.1s2, x1>0.1(s1+s2), where s1 is the maximum width of one of the adjacent two slot segments in the d-axis direction, and s2 is the maximum width of the other of the adjacent two slot segments in the d-axis direction.

[0018] Preferably, the sum of the widths of the partitioning ribs between the slot segments of the q-axis filling slot under the same pole in the d-axis direction is ∑x1, ∑x1>0.1∑(s1+s2), where ∑(s1+s2) is the sum of the widths of the q-axis filling slots in the d-axis direction.

[0019] Preferably, the width of the partitioning rib between the adjacent two slot segments in the d-axis direction is x1, x1≥σ, σ is the width of the air gap between the stator and the rotor.

[0020] Preferably, the area difference of the slot segments under the same pole is within ±15%.

[0021] Preferably, the maximum width of the rotor shaft hole in the q-axis direction is less than or equal to the maximum width of the rotor shaft hole in the d-axis direction.

[0022] Preferably, the rotor shaft hole is composed of an arc segment and / or a straight line segment.

[0023] Preferably, at least part of the filling slot is filled with a conductive non-magnetic material, and a short circuit is achieved through end rings at both ends of the rotor core to form a squirrel cage.

[0024] According to another aspect of the present application, a self-starting synchronous reluctance motor is provided, comprising a motor rotor as described above.

[0025] The motor rotor provided by the present application comprises a rotor core, and filling slots and slit slots are formed in the rotor core. The filling slots comprise non-independent filling slots and q-axis filling slots. The non-independent filling slots are arranged on both sides of the slit slots, and the q-axis filling slots are arranged on one side of the outer circle of the rotor close to the q-axis. The non-independent filling slots and the slit slots in the same layer are separated by a partitioning rib. The width of the partitioning rib along the d-axis direction is L, the width of the end of the filling slot arranged in the same layer as the partitioning rib close to the partitioning rib is M, and 0.2M≤L≤0.35M is satisfied between L and M. Meanwhile, the width K of the end of the slit slot arranged in the same layer as the partitioning rib close to the partitioning rib should satisfy K≤M. By limiting the size relationship between the partitioning rib and the ends of the filling slots and the slit slots, the ability of the partitioning rib to withstand pressure can be enhanced, thereby enhancing the mechanical strength of the rotor, reducing the deformation of the rotor in the manufacturing process, and reducing the difficulty of the process manufacturing.

[0026] 0.35M, and meanwhile, the width K of the end of the slit slot arranged in the same layer as the partitioning rib close to the partitioning rib should satisfy K≤M. By limiting the size relationship between the partitioning rib and the ends of the filling slots and the slit slots, the ability of the partitioning rib to withstand pressure can be enhanced, thereby enhancing the mechanical strength of the rotor, reducing the deformation of the rotor in the manufacturing process, and reducing the difficulty of the process manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 A structural schematic diagram of a motor rotor according to an embodiment of the present application;

[0028] Fig. 2 A structural schematic diagram of a motor rotor according to an embodiment of the present application;

[0029] The following signs are used in the drawings:

[0030] 1, rotor core; 2, slit slot; 3, non-independent filling slot; 4, q-axis filling slot; 5, partitioning rib; 6, rotor shaft hole; 7, magnetic flux channel; 8, slot segment. DETAILED DESCRIPTION

[0031] For reference Figs. 1-2As shown, according to the embodiment of the present application, the motor rotor comprises a rotor core 1, the rotor core 1 is provided with filling grooves and slit grooves 2, the filling grooves comprise non-independent filling grooves 3 and q-axis filling grooves 4, the non-independent filling grooves 3 are arranged on both sides of the slit grooves 2, the q-axis filling grooves 4 are arranged on one side of the outer circle of the rotor close to the q-axis, the non-independent filling grooves 3 and the slit grooves 2 of the same layer are separated by a partition rib 5, the width of the partition rib 5 along the d-axis direction is L, the width of the end of the filling groove arranged on the same layer as the partition rib 5 close to the partition rib 5 is M, 0.2M≤L≤0.35M is satisfied between L and M, and the width K of the end of the slit groove 2 arranged on the same layer as the partition rib 5 close to the partition rib 5 should satisfy K≤M.

[0032] The existence of the partition rib 5 can enhance the mechanical strength of the rotor, reduce the deformation of the rotor in the manufacturing process, and reduce the difficulty of the manufacturing process. Limiting the size of the end between the partition rib 5 and the filling groove and the slit groove 2 can enhance the pressure bearing capacity of the partition rib 5, enhance the area of the magnetic barrier layer bearing pressure, reduce the deformation of the rotor in the manufacturing process, and reduce the process difficulty.

[0033] In one embodiment, the slit groove 2 comprises an arc segment and / or a straight line segment, when the slit groove 2 comprises an arc segment, the arc of the arc segment gradually increases along the direction from the rotor shaft hole 6 to the outer circle of the rotor, and the outer circle arc of the slit groove 2 of the same layer is greater than the inner circle arc.

[0034] In one embodiment, the slit groove 2 comprises an arc segment and / or a straight line segment, and the width of the slit groove 2 in the q-axis direction increases along the direction from both sides of the q-axis.

[0035] Through the above arrangement, the utilization rate of the rotor space can be increased, the slit grooves are reasonably arranged to increase the rotor salient pole ratio, and the motor reluctance torque is improved.

[0036] In one embodiment, the sum of the widths of the q-axis filling groove 4 and the slit groove 2 in the q-axis direction is m1+∑m2, the width from the rotor shaft hole 6 to the outer circle of the rotor is m3, and (m1+∑m2) / m3=0.3-0.5, so that a reasonable magnetic barrier ratio can be selected, which can ensure sufficient magnetic barrier width and reasonable magnetic flux channel, increase the salient pole ratio of the motor, and prevent the magnetic circuit from being oversaturated.

[0037] Preferably, (m1+∑m2) / m3=0.35-0.45.

[0038] In one embodiment, the minimum width of the magnetic flux channel 7 between the two adjacent non-independent filling grooves 3 is W, and the minimum width of the magnetic flux channel 7 between the slit grooves 2 of the same layer as the two non-independent filling grooves 3 is d, W≥d, which is to ensure that there is enough width between the filling grooves to avoid magnetic field saturation and affect the magnetic flux flow between the magnetic barrier layers.

[0039] In one embodiment, the filling slot further comprises a q-axis filling slot 4, which is arranged at the outer periphery of the rotor core 1 near the side of the q-axis, and in the cross section perpendicular to the central axis of the rotor core 1, the included angle a1 between the two ends of the q-axis filling slot 4 and the line connecting the central axis of the rotor core 1 satisfies 20°≤a1≤60°.

[0040] Preferably, 30°≤a1≤50°. In this way, the magnetic barrier layer is formed and serves as the filling slot, which can be used as the magnetic barrier layer to increase the reluctance torque of the motor, and also can be used as the starting squirrel cage to improve the starting performance of the motor.

[0041] In one embodiment, the total area of the filling slot accounts for 30% to 70% of the sum of the areas of the filling slot and the slot 2.

[0042] Preferably, the total area of the filling slot accounts for 35% to 50% of the sum of the areas of the filling slot and the slot 2.

[0043] By limiting the proportion of the total area of the filling slot to the sum of the areas of the filling slot and the slot 2, a certain proportion of the filling slot area can be ensured, so that the motor has a certain load starting capability.

[0044] In one embodiment, the non-independent filling slot 3 and the slot 2 of the same layer form a magnetic barrier layer, the q-axis filling slot 4 forms a magnetic barrier layer, and the minimum distance h1 between the magnetic barrier layer and the outer circle of the rotor satisfies h1≥σ, where σ is the width of the air gap between the stator and the rotor, so as to ensure the structural strength of the rotor.

[0045] In one embodiment, the non-independent filling slot 3 and the slot 2 of the same layer form a magnetic barrier layer, the q-axis filling slot 4 forms a magnetic barrier layer, and the minimum width of the magnetic flux path 7 between the adjacent two layers of magnetic barrier layers in the q-axis direction is h3, the minimum width of the magnetic barrier layer with smaller width in the d-axis direction among the adjacent two layers of magnetic barrier layers is h2, and h3≥1.5h2. In this way, the width of the magnetic barrier layer and the width between the magnetic barrier layers can be reasonably arranged, so as to fully utilize the reluctance difference generated by the magnetic barrier layer to improve the reluctance torque, and avoid the saturation of the magnetic flux path.

[0046] In one embodiment, the non-independent filling slot 3 and the slot 2 form a partition rib 5, and the side surface of the partition rib 5 is parallel or intersects with the plane where the q-axis is located. The partition rib 5 can be arranged in a staggered manner according to the direction of the magnetic leakage flux of the rotor to reduce the magnetic leakage of the rotor.

[0047] In one embodiment, the q-axis filling slot 4 under the same pole is in a segmented structure, and the slot segments 8 of the adjacent two q-axis filling slots 4 have the partition rib 5 therebetween.

[0048] The width of the partitioning rib 5 between the two adjacent slot sections 8 in the d-axis direction is x1, x1>0.1s1, x1>0.1s2, x1>0.1(s1+s2), wherein s1 is the maximum width of one of the two adjacent slot sections 8 in the d-axis direction, and s2 is the maximum width of the other of the two adjacent slot sections 8 in the d-axis direction.

[0049] The sum of the widths of the partitioning ribs 5 between the slot sections 8 of the same q-axis filling slot 4 in the d-axis direction is ∑x1, ∑x1>0.1∑(s1+s2), wherein ∑(s1+s2) is the sum of the widths of the slot sections 8 in the d-axis direction.

[0050] The q-axis filling slots 4 are arranged in the q-axis direction of the outer periphery of the rotor, which can not only act as squirrel cage slots to improve the load starting capability of the motor, but also form a magnetic barrier layer to increase the saliency ratio and improve the reluctance torque. The independent filling slots are designed in sections, and the size of the partitioning rib between the sections is limited, which aims to improve the mechanical structural strength of the rotor and reduce the difficulty of the manufacturing process.

[0051] In one embodiment, the slot sections 8 constituting the q-axis filling slot 4 are four, the four slot sections 8 are symmetrical about the q-axis, the partitioning rib 5 between the two slot sections 8 in the middle is located on the q-axis and is bisected by the q-axis.

[0052] In one embodiment, the slot sections 8 constituting the q-axis filling slot 4 are three, the three slot sections 8 are symmetrical about the q-axis, and the q-axis passes through the slot section 8 in the middle and bisects the slot section 8. In this embodiment, the number of q-axis filling slots 4 is small, the number of partitioning ribs 5 between adjacent q-axis filling slots 4 is also reduced, and the rotor shaft hole 6 can adopt an elliptical structure. The reduction in the number of partitioning ribs 5 can increase the reluctance in the q-axis direction, increase the difference between the d-axis and q-axis reluctances, and improve the reluctance torque of the motor. The elliptical rotor shaft hole 6 can reasonably utilize the space within the innermost layer of the slot 2.

[0053] In one embodiment, the width of the partitioning rib 5 between the two adjacent slot sections 8 in the d-axis direction is x1, x1≥σ, and σ is the width of the air gap between the stator and the rotor.

[0054] The area difference of each slot section 8 under the same pole is within ±15%.

[0055] The above width limitation of the partitioning rib 5 and the area difference limitation of each slot section 8 can make the pressure on the partitioning ribs near each q-axis filling slot 4 consistent, so that the pressure on some partitioning ribs 5 is not too large.

[0056] In one embodiment, the maximum width of the rotor shaft hole 6 in the q-axis direction is less than or equal to the maximum width of the rotor shaft hole 6 in the d-axis direction, which can increase the utilization of the rotor space, so as to reasonably arrange the slot, increase the rotor saliency ratio, and improve the motor reluctance torque.

[0057] In one embodiment, the rotor shaft hole 6 is composed of an arc segment and / or a straight line segment. The rotor shaft hole 6 is located at the center of the rotor, and its existence affects the arrangement of the magnetic barrier layer. Without limiting the rotor shaft hole 6 to be circular, i.e., the rotor shaft hole 6 can be elliptical or oval, which can increase the space for arranging the magnetic barrier layer on the rotor, and further improve the output torque of the motor.

[0058] In one embodiment, at least part of the filling slot is filled with conductive and non-magnetic material, and the short circuit is achieved through the end ring at both ends of the rotor core 1 to form a squirrel cage. In this embodiment, the filling slot includes the q-axis filling slot 4 and at least part of the filling slot of the non-independent filling slot 3, which is filled with conductive and non-magnetic material in the slot, and the filling slot is self-short-circuited through the end ring at both ends of the rotor to form a squirrel cage structure. The material of the end ring is the same as that of the filling material in the filling slot. The self-short-circuited squirrel cage structure provides asynchronous torque in the starting stage of the motor to realize self-starting of the motor; and the multi-layer magnetic barrier layer structure provides reluctance torque for the motor to realize synchronous operation of the motor.

[0059] According to the embodiments of the present application, the self-starting synchronous reluctance motor includes the motor rotor as described above.

[0060] It is easy for those skilled in the art to understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0061] The above is only the preferred embodiment of the present application, and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, which should be regarded as the protection scope of the present application.

Claims

1. A motor rotor, characterized in that: The invention comprises a rotor core (1), wherein a filling slot and a slit slot (2) are provided on the rotor core (1), wherein the filling slot comprises a non-independent filling slot (3) and a q-axis filling slot (4), wherein the non-independent filling slot (3) is arranged on both sides of the slit slot (2), and the q-axis filling slot (4) is arranged on the side of the rotor outer circle close to the q-axis, wherein the non-independent filling slot (3) and the slit slot (2) on the same layer are divided by a dividing rib (5), wherein the width of the dividing rib (5) on the same layer along the d-axis direction is L, and the width of the end of the filling slot arranged on the same layer as the dividing rib (5) close to the dividing rib (5) is M, and L and M satisfy 0.2M≤L≤0.35M, and at the same time, the width K of the end of the slit slot (2) arranged on the same layer as the dividing rib (5) close to the dividing rib (5) should satisfy K≤M; The q-axis filling groove (4) under the same pole is a segmented structure, and a dividing rib (5) is provided between the groove segments (8) of two adjacent segments of the q-axis filling groove (4); The width of the dividing rib (5) between two adjacent slot segments (8) along the d-axis direction is x1, x1>0.1s1, x1>0.1s2, x1>0.1(s1+s2), wherein s1 is the maximum width of one of the two adjacent slot segments (8) along the d-axis direction, and s2 is the maximum width of the other of the two adjacent slot segments (8) along the d-axis direction; The sum of the widths of the dividing ribs (5) between the slot segments (8) of the q-axis filling slot (4) under the same pole along the d-axis direction is ∑x1, ∑x1>0.1∑(s1+s2), wherein ∑(s1+s2) is the sum of the widths of the q-axis filling slots along the d-axis direction.

2. The motor rotor according to claim 1, characterized in that: The slit slot (2) includes an arc segment and / or a straight line segment. When the slit slot (2) includes an arc segment, the curvature of the arc segment gradually increases along the direction from the rotor shaft hole (6) to the outer circle of the rotor, and the outer circle curvature of the slit slot (2) on the same layer is greater than the inner circle curvature.

3. The motor rotor according to claim 1, characterized in that: The slit groove (2) comprises arc segments and / or straight line segments, and along the direction from the q axis to both sides, the width of the slit groove (2) in the q axis direction increases gradually.

4. The motor rotor according to claim 1, characterized in that: The sum of the widths of the q-axis filling groove (4) and the slit groove (2) along the q-axis direction is m1+∑m2, the width from the rotor shaft hole (6) to the rotor outer circle is m3, (m1+∑m2) / m3=0.3-0.

5.

5. The motor rotor according to claim 4, characterized in that: (m1+∑m2) / m3=0.35~0.

45.

6. The motor rotor according to claim 1, characterized in that: The minimum width of the magnetic channel (7) between two adjacent non-independent filling slots (3) is W, and the minimum width of the magnetic channel (7) between the slit slots (2) on the same layer as the two non-independent filling slots (3) is d, where W≥d.

7. The motor rotor according to claim 1, characterized in that: The ratio of the total area of ​​the filling groove to the sum of the areas of the filling groove and the slit groove (2) is 30% to 70%.

8. The motor rotor according to claim 7, characterized in that: The total area of ​​the filling groove accounts for 35% to 50% of the sum of the areas of the filling groove and the slit groove (2).

9. The motor rotor according to claim 1, characterized in that: On a cross section perpendicular to the central axis of the rotor core (1), an angle α1 formed by a line connecting the two ends of the q-axis filling slot (4) and the central axis of the rotor core (1) satisfies 20°≤α1≤60°.

10. The motor rotor according to claim 1, characterized in that: The non-independent filling slots (3) and the slit slots (2) on the same layer form a magnetic barrier layer, the q-axis filling slots (4) form a magnetic barrier layer, and the minimum distance h1 between the magnetic barrier layer and the outer circle of the rotor satisfies h1≥σ, where σ is the width of the air gap between the stator and the rotor.

11. The motor rotor according to claim 1, characterized in that: The non-independent filling slot (3) and the slit slot (2) in the same layer form a magnetic barrier layer, the q-axis filling slot (4) forms a magnetic barrier layer, the minimum width of the magnetic conductive channel (7) between two adjacent magnetic barrier layers along the q-axis direction is h3, and the minimum width of the magnetic barrier layer with a smaller width along the d-axis direction in the two adjacent magnetic barrier layers is h2, and h3 is greater than or equal to 1.5h2.

12. The motor rotor according to claim 1, characterized in that: The width of the dividing rib (5) between two adjacent slot segments (8) along the d-axis direction is x1, x1≥σ, and σ is the width of the air gap between the stator and the rotor.

13. The motor rotor according to claim 1, characterized in that The area difference of each slot segment (8) under the same pole is within ±15%.

14. The motor rotor according to claim 1, characterized in that: The maximum width of the rotor shaft hole (6) in the q-axis direction is less than or equal to the maximum width of the rotor shaft hole (6) in the d-axis direction.

15. The motor rotor according to claim 14, characterized in that: The rotor shaft hole (6) is composed of arc segments and / or straight line segments.

16. The motor rotor according to any one of claims 1 to 15, characterized in that At least part of the filling slots is filled with conductive but non-magnetic material, and short circuit is achieved through end rings (12) at both ends of the rotor core (1) to form a squirrel cage.

17. A self-starting synchronous reluctance motor, comprising a motor rotor, characterized in that: The motor rotor is the motor rotor according to any one of claims 1 to 16.

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