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 arranged on both sides of the slit grooves (2), and the q-axis filling grooves (4) are arranged on one side of the outer circle of the rotor close to the q-axis. At least part of the filling grooves comprises at least two groove sections (9). The groove sections (9) of the same filling groove are communicated. Adjacent groove sections (9) are communicated through a communication channel (8). The maximum width of the communication channel (8) in the q-axis direction is smaller than the maximum width of the filling groove where the communication channel (8) is located in the q-axis direction. According to the motor rotor, the starting torque of the motor can be increased, and the starting ability of the motor can be improved.

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 machine. BACKGROUND

[0002] The self-starting synchronous reluctance machine combines the advantages of the asynchronous machine on the basis of the synchronous reluctance 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 machine, the electric machine can realize constant-speed operation, has low rotor loss, and improved efficiency during synchronous operation; compared with the asynchronous-starting permanent-magnet synchronous machine, the electric machine does not use permanent-magnet material, has low cost, and does not have the problem of permanent-magnet demagnetization.

[0003] The special structure of the self-starting reluctance machine causes the problem of magnetic field imbalance, which leads to the existence of reluctance negative sequence torque during the starting process, resulting in a concave point in the average torque during the starting process, and causing poor starting ability. 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 machine, which can increase the starting torque of the electric machine and improve the starting ability of the electric machine.

[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 rotor outer circle close to the q-axis, at least part of the filling grooves comprises at least two groove segments, the groove segments of the same filling groove are connected, adjacent groove segments are connected through a connecting channel, and the maximum width of the connecting channel in the q-axis direction is smaller than the maximum width of the filling groove where the connecting channel is located in the q-axis direction.

[0006] Preferably, the maximum width of the connecting channel in the q-axis direction is m1, the maximum width of the filling groove where the connecting channel is located in the q-axis direction is m, and m1 / m=0.05-0.5.

[0007] Preferably, m1 / m=0.1-0.3.

[0008] Preferably, the rotor core is provided with rotor baffles and end rings at both ends, the rotor baffles are arranged between the end rings and the rotor core, and the rotor baffles are provided with connecting grooves corresponding to the filling grooves.

[0009] Preferably, the filling grooves arranged on the rotor core are blocked by the rotor baffles from the n-th groove segment close to the rotor outer circle side to the side close to the slit groove, and n≥2.

[0010] Preferably, the total area of the communication slots on the rotor baffle is less than or equal to the total area of the filling slots on the rotor core.

[0011] Preferably, the communication slots on the rotor baffle are arranged at the same positions as the filling slots on the rotor core, and the area of a single communication slot on the rotor baffle is less than or equal to the area of a single filling slot at the same position on the rotor core.

[0012] Preferably, the maximum width of the communication slots in the q-axis direction is less than or equal to the maximum width of the filling slots at the same position on the rotor core in the q-axis direction.

[0013] Preferably, the maximum width of the outer contour of the rotor baffle is less than or equal to the outer diameter of the rotor core, and the maximum width of the inner hole of the rotor baffle in the q-axis direction is greater than or equal to the maximum width in the d-axis direction.

[0014] Preferably, the thickness of the rotor baffle in the stacking direction of the rotor core is greater than or equal to the thickness of the rotor lamination forming the rotor core in this direction.

[0015] Preferably, the total area of the slit slots on the rotor core on the inner peripheral side of the inner hole of the rotor baffle accounts for at least 40% of the total area of the motor flow-through holes.

[0016] Preferably, the maximum width of the outer contour of the end ring is less than or equal to the maximum width of the outer contour of the rotor baffle, and the maximum distance from the center of the rotor core to the end surface of the end ring is greater than or equal to the maximum distance from the center of the rotor core to the end surface of the rotor baffle.

[0017] Preferably, a partition rib is formed between the non-independent filling slots and the slit slots, the width of the partition rib farthest from the d-axis in the d-axis direction is L1, and the width of the partition rib closest to the d-axis in the d-axis direction is L2, L1≥L2, and L1≥0.5*σ, where σ is the width of the air gap between the stator and the rotor.

[0018] Preferably, a partition rib is formed between the non-independent filling slots and the slit slots, the width of the partition rib farthest from the d-axis in the d-axis direction is L1, and the width of the partition rib between the filling slots and the slit slots including at least two slot segments in the d-axis direction is less than or equal to L1.

[0019] Preferably, a partition rib is formed between the non-independent filling slots and the slit slots, and the plane in which the side surface of the partition rib is parallel or intersects the plane in which the q-axis is located.

[0020] Preferably, the filling slots further include q-axis filling slots arranged on the outer periphery of the rotor core on the side close to the q-axis, the sum of the widths of the q-axis filling slots and the slit slots in the q-axis direction is d1+∑d2, the width of the rotor shaft hole to the outer circle of the rotor is d3, and (d1+∑d2) / d3=0.3-0.5.

[0021] Preferably, (d1+∑d2) / d3=0.32~0.48.

[0022] Preferably, (d1+∑d2) / d3=0.36~0.42.

[0023] 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.

[0024] Preferably, the non-independent filling slots and the slot slots in the same layer form a magnetic barrier layer, the minimum width of the magnetic flux channel between the adjacent two magnetic barrier layers in the q-axis direction is h1, the minimum width of the magnetic barrier layer with smaller width in the q-axis direction among the adjacent two magnetic barrier layers in the q-axis direction is h2, h1≥1.5h2.

[0025] Preferably, the filling slot further comprises a q-axis filling slot, the q-axis filling slot is arranged on the outer periphery of the rotor core close to the q-axis, and in the cross section perpendicular to the central axis of the rotor core, the included angle α1 formed by the two ends of the q-axis filling slot and the central axis of the rotor core satisfies 20°≤α1≤60°.

[0026] Preferably, 30°≤α1≤50°.

[0027] Preferably, the spacing between the innermost magnetic barrier layer close to the rotor shaft hole and the outer circle of the rotor is h3, the spacing between the outermost magnetic barrier layer away from the rotor shaft hole and the outer circle of the rotor is h4, h4≥h3, and 0≤h4≤2.5σ, σ is the width of the air gap between the stator and the rotor.

[0028] Preferably, the total area of the filling slot accounts for 30%~70% of the sum of the areas of the filling slot and the slot slot.

[0029] Preferably, the total area of the filling slot accounts for 35%~50% of the sum of the areas of the filling slot and the slot slot.

[0030] Preferably, the slot slot comprises an arc segment and / or a straight line segment, when the slot slot 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 slot slot in the same layer is greater than the inner circle arc.

[0031] Preferably, the slot slot comprises an arc segment and / or a straight line segment, and the width of the slot slot in the q-axis direction increases along the direction from the q-axis to both sides.

[0032] 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.

[0033] Preferably, the rotor shaft hole is composed of an arc segment and / or a straight line segment.

[0034] Preferably, at least part of the filling slots are filled with electrically conductive and magnetically non-conductive material, and short circuit is achieved by end rings at both ends of the rotor core, forming a squirrel cage.

[0035] According to another aspect of the present application, a self-starting synchronous reluctance motor is provided, comprising a motor rotor as described above.

[0036] 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. At least part of the filling slots comprises at least two slot segments. The slot segments of the same filling slot are connected in communication, and the adjacent slot segments are connected in communication through connecting channels. The maximum width of the connecting channels in the q-axis direction is smaller than the maximum width of the filling slots in which the connecting channels are located in the q-axis direction. The motor rotor comprises at least two segments of at least part of the filling slots. The leakage reactance of the part of the filling slots close to the outer circle of the rotor is small, and the leakage reactance of the part of the filling slots close to the slit slots is large. The different leakage reactance at different segments can increase the starting current of the part of the filling slots close to the outer circle of the rotor. The larger starting current can generate larger starting torque, which helps to improve the starting capability of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 Structure diagram of the rotor core of the motor rotor of one embodiment of the present application;

[0038] Figure 2 Structure diagram of the rotor baffle of one embodiment of the present application;

[0039] Figure 3 Structure diagram of the motor rotor of one embodiment of the present application;

[0040] Figure 4 Comparison diagram of the rotation speed of the motor of one embodiment of the present application and the motor of the related art in the starting process;

[0041] Figure 5 Comparison of the maximum torque of the motor of one embodiment of the present application and the motor of the related art at different rotation speeds in the starting process.

[0042] The signs in the drawings represent:

[0043] 1, rotor core; 2, slit slot; 3, non-independent filling slot; 4, q-axis filling slot; 5, division rib; 6, rotor shaft hole; 7, magnetically conductive channel; 8, connecting channel; 9, slot segment; 10, rotor baffle; 11, connecting slot; 12, end ring. DETAILED DESCRIPTION

[0044] For reference Figures 1 to 5 As shown in the drawings, according to the embodiments 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 rotor outer circle close to the q-axis, at least part of the filling grooves comprises at least two groove segments 9, the groove segments 9 constituting the same filling groove are communicated, adjacent groove segments 9 are communicated through a communication channel 8, and the maximum width of the communication channel 8 in the q-axis direction is smaller than the maximum width of the filling groove where the communication channel 8 is located in the q-axis direction.

[0045] The motor rotor comprises at least part of the filling grooves composed of at least two segments, the leakage reactance of the part of the filling grooves close to the rotor outer circle side is small, the leakage reactance of the part of the filling grooves close to the slit grooves 2 is large, and the leakage reactance is different at different segments, so that the starting current of the part of the filling grooves close to the rotor outer circle side can be increased, the larger starting current can generate larger starting torque, and for reference Figure 4 As shown in the drawings, thereby helping to improve the starting ability of the motor, as Figures 4 to 5 As shown in the drawings, the starting torque and starting ability of the motor of the embodiments of the present application are obviously improved compared with the motor of the prior art.

[0046] In the embodiments, the communication channel 8 is communicated between the groove segments 9 of the filling grooves comprising at least two groove segments 9, on the one hand, the effect that the leakage reactance of the groove segments 9 is different can be more obvious, and the starting current of the first segment of the filling grooves close to the rotor outer circle side can be further increased; on the other hand, the mechanical strength of the rotor can be enhanced.

[0047] In one embodiment, the maximum width of the communication channel 8 in the q-axis direction is m1, and the maximum width of the filling groove where the communication channel 8 is located in the q-axis direction is m, and m1 / m=0.05-0.5.

[0048] Preferably, m1 / m=0.1-0.3.

[0049] The maximum width of the communication channel 8 in the q-axis direction is limited, on the one hand, the leakage reactance of the segments of the filling grooves cannot be close due to the value being too large, and the purpose of increasing the starting torque cannot be achieved; on the other hand, the process difficulty of filling the filling grooves with filling materials cannot be increased due to the value being too small.

[0050] In one embodiment, the rotor core 1 is provided with a rotor baffle 10 and an end ring 12 at both ends, the rotor baffle 10 is arranged between the end ring 12 and the rotor core 1, and the rotor baffle 10 is provided with a communication groove 11 corresponding to the filling grooves.

[0051] The filling slot on the rotor core 1, from the side close to the rotor outer circle to the side close to the slot 2, the n-th slot section 9 is blocked by the rotor baffle 10, n≥2. In this embodiment, the n-th slot section 9 from the side close to the rotor outer circle to the side close to the slot 2 does not have a communication slot 11 at the corresponding rotor baffle 10, but is blocked by the plate body of the rotor baffle 10. The communication slot 11 on the rotor baffle 1 is only set on the part close to the rotor outer circle of the filling slot on the rotor core, and the part close to the slot 2 of the filling slot does not have a corresponding communication slot 11. The filling material in this part is filled into the part close to the rotor outer circle through the communication channel 8. Since the slot 2 and the part close to the slot 2 of the rotor core 1 are the weakest part of the rotor mechanical strength, this setting can enhance the mechanical strength of the rotor, reduce the deformation of the rotor during the manufacturing process, and reduce the process difficulty.

[0052] In one embodiment, the rotor baffle 10 is provided with a communication slot 11, and the total area of the communication slot 11 on the rotor baffle 10 is less than or equal to the total area of the filling slot on the rotor core 1. The communication slot 11 on the rotor baffle 10 is the inlet for filling the filling material into the filling slot on the rotor core 1. The communication slot 11 is provided on the rotor baffle 10 to enable the filling material to enter the filling slot on the rotor core 1. Ensuring that the total area of the communication slot 11 on the rotor baffle 10 is not greater than the total area of the filling slot provided on the rotor core 1 can reduce the stress area of the non-filling slot part of the rotor core 1 during the filling of the filling material, ensure its mechanical strength during the filling of the filling material, and reduce the deformation amount.

[0053] In one embodiment, the communication slot 11 provided on the rotor baffle 10 is at the same position as the filling slot provided on the rotor core 1, and the area of a single communication slot 11 on the rotor baffle 10 is less than or equal to the area of a single filling slot at the same position on the rotor core 1, which can reduce the local deformation of the rotor core 1 during the filling of the filling material.

[0054] In one embodiment, the maximum width of the communication slot 11 in the q-axis direction is less than or equal to the maximum width of the filling slot at the same position on the rotor core in the q-axis direction, so as to reduce the inward or outward concave deformation of the rotor core 1 in the q-axis direction during the filling of the filling material.

[0055] In one embodiment, the maximum width of the outer contour of the rotor baffle 10 is less than or equal to the outer circle diameter of the rotor core 1, and the maximum width of the inner hole of the rotor baffle 10 in the q-axis direction is greater than or equal to the maximum width in the d-axis direction. The rotor baffle 10 is part of the motor rotor, and its outer contour should not be greater than the outer circle of the rotor core 1 to form a certain width air gap with the stator. The q-axis width of its inner contour corresponding to the slot 2 of the rotor core 1 should not be less than the d-axis width, so that enough area of the slot 2 directly contacts the air to form a flow-through hole and increase the heat dissipation of the rotor.

[0056] In one embodiment, the thickness of the rotor baffle 10 along the stacking direction of the rotor core 1 is greater than or equal to the thickness of the rotor lamination forming the rotor core 1 in this direction, to ensure the mechanical strength of the rotor core 1.

[0057] In one embodiment, the total area of the slot 2 on the inner circumferential side of the inner hole of the rotor baffle 10 on the rotor core 1 accounts for at least 40% of the total area of the motor flow-through hole, to ensure that a sufficient area of the slot 2 directly contacts air to form a flow-through hole and increase the heat dissipation of the rotor.

[0058] In one embodiment, the maximum width of the outer contour of the end ring 12 is less than or equal to the maximum width of the outer contour of the rotor baffle 10, and the maximum distance from the center of the rotor core 1 to the end face of the end ring 12 is greater than or equal to the maximum distance from the center of the rotor core 1 to the end face of the rotor baffle 10. The maximum width of the outer contour of the end ring 12 is not greater than the maximum width of the outer contour of the rotor baffle 10, to ensure that the part of the rotor core 1 on the outer side of the rotor circle that is not covered by the rotor baffle 10 is subjected to stress when the filling material is filled, reducing local deformation; the maximum distance from the center of the rotor core 1 to the end face of the end ring 12 is not less than the maximum distance from the center of the rotor core 1 to the end face of the rotor baffle 10, to ensure that the rotor has a certain volume of the end ring 12, which helps to improve the starting ability of the motor.

[0059] In one embodiment, the non-independent filling slot 3 and the slot 2 form a partition rib 5, the width of the partition rib 5 farthest from the d-axis along the d-axis direction is L1, and the width of the partition rib 5 closest to the d-axis along the d-axis direction is L2, L1≥L2, and L1≥0.5*σ, where σ is the width of the air gap between the stator and the rotor. The partition rib 5 can enhance the mechanical strength of the rotor core 1; limiting the minimum width of the partition rib 5 can reduce the processing difficulty and improve the mechanical strength of the rotor; L1≥L2 can reduce the leakage of the inner magnetic barrier layer and improve the efficiency of the motor.

[0060] In one embodiment, the non-independent filling slot 3 and the slot 2 form a partition rib 5, the width of the partition rib 5 farthest from the d-axis along the d-axis direction is L1, and the width of the partition rib 5 between the filling slot 3 composed of at least two slot segments 9 and the slot 2 along the d-axis direction is less than or equal to L1. The filling slot 3 composed of at least two slot segments 9 can enhance the mechanical strength of the slot 2 at the magnetic barrier layer, and a smaller width of the partition rib 5 can be used at this time to reduce the leakage and improve the efficiency of the motor.

[0061] 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 the plane in which the q-axis lies. The partition rib can be arranged in a staggered manner according to the direction of the rotor leakage magnetic force line to reduce the rotor leakage.

[0062] In one embodiment, the filling slot further comprises a q-axis filling slot 4 arranged at the outer periphery of the rotor core 1 near the q-axis, and the sum of the widths of the q-axis filling slot 4 and the slit slot 2 in the q-axis direction is d1+∑d2, the width of the rotor shaft hole 6 to the rotor outer circle is d3, and (d1+∑d2) / d3=0.3-0.5, so that a reasonable magnetic barrier ratio can be selected, both to ensure sufficient magnetic barrier width and to ensure reasonable magnetic flux channel, to increase the motor saliency ratio while preventing magnetic circuit oversaturation.

[0063] Preferably, (d1+∑d2) / d3=0.32-0.48.

[0064] Further preferably, (d1+∑d2) / d3=0.36-0.42.

[0065] In one embodiment, the minimum width of the magnetic flux channel 7 between the two adjacent non-independent filling slots 3 is W, and the minimum width of the magnetic flux channel 7 between the slit slots 2 in the same layer as the two non-independent filling slots 3 is d, W≥d, the purpose being to ensure that there is sufficient width between the filling slots to avoid magnetic field saturation and affect the magnetic flux flow between the magnetic barrier layers.

[0066] In one embodiment, the non-independent filling slots 3 and the slit slots 2 in the same layer form a magnetic barrier layer, the minimum width of the magnetic flux channel 7 in the q-axis direction between the two adjacent magnetic barrier layers is h1, the minimum width of the magnetic flux channel 7 in the q-axis direction of the magnetic barrier layer with smaller width in the q-axis direction among the two adjacent magnetic barrier layers is h2, and h1≥h2. The multi-layer magnetic barrier layer structure provides magnetic reluctance torque for the motor to enable synchronous operation; h1≥h2, which can reduce the difficulty of rotor machining and ensure the uniformity and unsaturation of the rotor magnetic density distribution.

[0067] In one embodiment, the filling slot further comprises a q-axis filling slot 4 arranged at the outer periphery of the rotor core 1 near the q-axis, and in a cross section perpendicular to the central axis of the rotor core 1, the included angle α1 formed by the two ends of the q-axis filling slot 4 and the central axis of the rotor core 1 satisfies 20°≤α1≤60°.

[0068] Preferably, 30°≤α1≤50°. In this way, the magnetic barrier layer is formed and acts as a filling slot, which can both act as a magnetic barrier layer to increase the magnetic reluctance torque of the motor and act as a starting squirrel cage to improve the starting performance of the motor.

[0069] In one embodiment, the interval between the innermost magnetic barrier layer close to the rotor shaft hole 6 and the rotor outer circle is h3, the interval between the outermost magnetic barrier layer far from the rotor shaft hole 6 and the rotor outer circle is h4, h4≥h3, and 0≤h4≤2.5σ, where σ is the width of the air gap between the stator and the rotor. 0≤h4≤2.5σ, i.e., the filling slot is an open slot or a closed slot, when the filling slot is a closed slot, limiting the maximum interval between it and the rotor outer circle can reduce magnetic leakage; h4≥h3 can reduce the magnetic leakage of the inner magnetic barrier layer while ensuring the mechanical strength at the outer magnetic barrier layer.

[0070] In one embodiment, the total area of the filling slot accounts for 30%-70% of the sum of the areas of the filling slot and the slit slot 2.

[0071] Preferably, the total area of the filling slot accounts for 35%-50% of the sum of the areas of the filling slot and the slit slot 2.

[0072] By limiting the proportion of the total area of the filling slot to the sum of the areas of the filling slot and the slit slot 2, a certain proportion of the filling slot area can be ensured, so that the motor has a certain load starting capacity.

[0073] In one embodiment, the slit slot 2 includes an arc segment and / or a straight line segment, when the slit slot 2 includes an arc segment, the arc degree of the arc segment gradually increases along the direction from the rotor shaft hole 6 to the rotor outer circle, and the outer circle arc degree of the slit slot 2 in the same layer is greater than the inner circle arc degree.

[0074] In one embodiment, the slit slot 2 includes an arc segment and / or a straight line segment, and the width of the slit slot 2 in the q-axis direction increases along the direction from both sides of the q-axis.

[0075] Through the above arrangement, the utilization rate of the rotor space can be increased, and the slit slot can be reasonably arranged to increase the rotor salient pole ratio and improve the motor reluctance torque.

[0076] 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 rate of the rotor space, so as to reasonably arrange the slit slot to increase the rotor salient pole ratio and improve the motor reluctance torque.

[0077] 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 or quadrilateral, which can increase the space for arranging the magnetic barrier layer on the rotor and further improve the output torque of the motor.

[0078] In one embodiment, the slots are filled with electrically conductive and magnetically non-conductive material, and the short circuit is achieved by the end rings 12 at both ends of the rotor core 1, forming a squirrel cage. In this embodiment, the slots include the q-axis filled slots 4 and at least part of the slots of the non-independent filled slots 3, which are filled with electrically conductive and magnetically non-conductive material, and the filled slots are connected by the end rings 12 at both ends of the rotor, forming a squirrel cage structure, and the material of the end rings 12 is the same as the filled material in the filled slots. The self-short-circuiting squirrel cage structure provides asynchronous torque during the starting stage of the motor to achieve self-starting of the motor, and the multi-layer magnetic barrier layer structure provides reluctance torque for the motor to achieve synchronous operation of the motor.

[0079] According to the embodiments of the present application, the self-starting synchronous reluctance motor includes a motor rotor, which is the motor rotor described above.

[0080] Those skilled in the art will readily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0081] The above is only a preferred embodiment of the present application, and is 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 is only a 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, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A motor rotor, characterized in that, The rotor core (1) is provided with a filling groove and a slit groove (2). The filling groove includes a non-independent filling groove (3) and a q-axis filling groove (4). The non-independent filling groove (3) is located on both sides of the slit groove (2). The q-axis filling groove (4) is located on the side of the outer circle of the rotor close to the q-axis. At least some of the filling grooves include at least two groove segments (9). The groove segments (9) that make up the same filling groove are connected. Adjacent groove segments (9) are connected by a connecting channel (8). The maximum width of the connecting channel (8) in the q-axis direction is less than the maximum width of the filling groove in the q-axis direction where the connecting channel (8) is located. The filling groove also includes a q-axis filling groove (4), which is located on the outer circumference of the rotor core (1) near the q-axis. The sum of the widths of the q-axis filling groove (4) and the slit groove (2) along the q-axis direction is d1+∑d2, and the width from the rotor shaft hole (6) to the outer circle of the rotor is d3, where (d1+∑d2) / d3 = 0.3~0.

5.

2. The motor rotor according to claim 1, characterized in that, The maximum width of the connecting channel (8) in the q-axis direction is m1, and the maximum width of the filling groove where the connecting channel (8) is located in the q-axis direction is m, m1 / m = 0.05~0.

5.

3. The motor rotor according to claim 2, characterized in that, m1 / m = 0.1 to 0.

3.

4. The motor rotor according to claim 1, characterized in that, The rotor core (1) is provided with rotor baffles (10) and end rings (12) at both ends. The rotor baffles (10) are located between the end rings (12) and the rotor core (1). A connecting groove (11) is provided on the rotor baffles (10) corresponding to the filling groove.

5. The motor rotor according to claim 4, characterized in that, The filling groove provided on the rotor core (1) has the nth segment (9) from the side near the outer circle of the rotor to the side near the slit groove (2) blocked by the rotor baffle (10), where n≥2.

6. The motor rotor according to claim 4, characterized in that, The total area of ​​the connecting slots (11) on the rotor baffle (10) is less than or equal to the total area of ​​the filling slots on the rotor core (1).

7. The motor rotor according to claim 6, characterized in that, The connecting slot (11) provided on the rotor baffle (10) is in the same position as the filling slot provided on the rotor core (1). The area of ​​a single connecting slot (11) on the rotor baffle (10) is less than or equal to the area of ​​a single filling slot on the rotor core (1) at the same position.

8. The motor rotor according to claim 6, characterized in that, The maximum width of the connecting slot (11) along the q-axis is less than or equal to the maximum width of the filling slot along the q-axis at the same position on the rotor core (1).

9. The motor rotor according to claim 4, characterized in that, The maximum width of the outer contour of the rotor baffle (10) is less than or equal to the outer diameter of the rotor core (1), and the maximum width of the inner hole of the rotor baffle (10) on the q axis is greater than or equal to the maximum width on the d axis.

10. The motor rotor according to claim 4, characterized in that, The thickness of the rotor baffle (10) along the stacking direction of the rotor core (1) is greater than or equal to the thickness of the rotor lamination forming the rotor core (1) in that direction.

11. The motor rotor according to claim 4, characterized in that, The total area of ​​the slit groove (2) on the rotor core (1) located on the inner circumferential side of the inner hole of the rotor baffle (10) accounts for at least 40% of the total area of ​​the motor flow hole.

12. The motor rotor according to claim 4, characterized in that, The maximum width of the outer contour of the end ring (12) is less than or equal to the maximum width of the outer contour of the rotor baffle (10), and the maximum distance from the center of the rotor core (1) to the end face of the end ring (12) is greater than or equal to the maximum distance from the center of the rotor core (1) to the end face of the rotor baffle (10).

13. The motor rotor according to claim 1, characterized in that, A dividing rib (5) is formed between the non-independent filling groove (3) and the slit groove (2). The width of the dividing rib (5) furthest from the d-axis along the d-axis direction is L1, and the width of the dividing rib (5) closest to the d-axis along the d-axis direction is L2. L1≥L2 and L1≥0.5*σ, where σ is the width of the air gap between the stator and the rotor.

14. The motor rotor according to claim 1, characterized in that, A dividing rib (5) is formed between the non-independent filling groove (3) and the slit groove (2). The width of the dividing rib (5) furthest from the d-axis along the d-axis direction is L1. The width of the dividing rib (5) between the filling groove (9) and the slit groove (2) along the d-axis direction is less than or equal to L1.

15. The motor rotor according to claim 1, characterized in that, A dividing rib (5) is formed between the non-independent filling groove (3) and the slit groove (2), and the plane on the side of the dividing rib (5) is parallel to or intersects the plane on the q-axis.

16. The motor rotor according to claim 1, characterized in that, (d1+∑d2) / d3=0.32~0.

48.

17. The motor rotor according to claim 1, characterized in that, (d1+∑d2) / d3=0.36~0.

42.

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

19. The motor rotor according to claim 1, characterized in that, The non-independent filling groove (3) and the slit groove (2) in the same layer form a magnetic barrier layer. The minimum width of the magnetic channel (7) between two adjacent magnetic barrier layers along the q-axis is h1. The minimum width of the magnetic barrier layer with the smaller width along the q-axis in the two adjacent magnetic barrier layers along the q-axis is h2. h1≥1.5h2.

20. The motor rotor according to claim 1, characterized in that, The filling groove also includes a q-axis filling groove (4), which is located on the outer circumference of the rotor core (1) near the q-axis. On the cross section perpendicular to the central axis of the rotor core (1), the included angle α1 formed by the lines connecting the two ends of the q-axis filling groove (4) and the central axis of the rotor core (1) satisfies 20°≤α1≤60°.

21. The motor rotor according to claim 20, characterized in that, 30°≤α1≤50°。 22. The motor rotor according to claim 1, characterized in that, The distance between the innermost magnetic barrier layer closest to the rotor shaft hole (6) and the outer circle of the rotor is h3, and the distance between the outermost magnetic barrier layer furthest from the rotor shaft hole (6) and the outer circle of the rotor is h4, h4≥h3, and 0≤h4≤2.5σ, where σ is the width of the air gap between the stator and the rotor.

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

24. The motor rotor according to claim 20, 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).

25. The motor rotor according to claim 1, characterized in that, The slit groove (2) includes an arc segment and / or a straight segment. When the slit groove (2) includes 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) in the same layer is greater than the inner circle arc.

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

27. 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.

28. The motor rotor according to claim 27, characterized in that, The rotor shaft hole (6) is composed of arc segments and / or straight segments.

29. The motor rotor according to any one of claims 1 to 28, characterized in that, At least part of the filling groove is filled with a conductive but non-magnetic material, and a short circuit is achieved through the end rings (12) at both ends of the rotor core (1) to form a squirrel cage.

30. 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 29.

Images