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), the non-independent filling grooves (3) are arranged on both sides of the slit grooves (2), the slit grooves (2) and the non-independent filling grooves (3) on both sides of the slit grooves (2) are arranged in the same layer, and the widths of at least part of the non-independent filling grooves (3) in the q-axis direction are different along the direction from the outer circle of the rotor to the rotor shaft hole (6). The width of the non-independent filling groove (3) on one side close to the slit groove (2) is the minimum width of the non-independent filling groove (3). According to the motor rotor, the starting torque of the motor can be increased while the synchronous ability is ensured, and the synchronous ability and starting ability of the motor are improved.

Description

Technical Field

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

[0002] Self-starting synchronous reluctance motors combine the advantages of asynchronous motors with those of synchronous reluctance motors. They achieve self-starting through asynchronous torque generated by rotor bars, eliminating the need for a frequency converter. Compared to asynchronous motors, these motors can achieve constant speed operation, have lower rotor losses, and offer improved efficiency during synchronous operation. Compared to asynchronous-starting permanent magnet synchronous motors, these motors do not use permanent magnet materials, resulting in lower costs and eliminating the demagnetization problem associated with permanent magnets.

[0003] However, in related technologies, the starting capability and synchronizing capability of self-starting synchronous reluctance motors are mutually restrictive. High rotor resistance results in high starting torque and low synchronizing torque, leading to strong starting capability but weak synchronizing capability. Conversely, low rotor resistance results in high synchronizing torque and low starting torque, leading to strong synchronizing capability but longer starting time and poorer starting capability. Starting capability and synchronizing capability are respectively limited by the rotor resistance during the starting process and near synchronization, making it difficult to increase the motor's starting torque while ensuring synchronizing capability. Summary of the Invention

[0004] Therefore, the technical problem to be solved by this application is to provide a motor rotor and a self-starting synchronous reluctance motor that can increase the starting torque of the motor while ensuring a certain pull-in synchronization capability, thereby improving the pull-in synchronization capability and starting capability of the motor.

[0005] To address the aforementioned issues, this application provides a motor rotor comprising a rotor core, on which a filling groove and a slit groove are formed. The filling groove includes a non-independent filling groove, which is disposed on both sides of the slit groove. The slit groove and the non-independent filling grooves on both sides of the slit groove are disposed in the same layer. Along the direction from the outer circle of the rotor to the rotor shaft hole, at least some of the non-independent filling grooves have unequal widths in the q-axis direction, and the width of the non-independent filling groove on the side closer to the slit groove is the minimum width of the non-independent filling groove.

[0006] Preferably, the maximum width of the non-independent filling groove in the q-axis direction is m, the minimum width is m1, and m1 / m = 0.1 to 0.6.

[0007] Preferably, m1 / m = 0.2 to 0.5.

[0008] Preferably, m1 / m = 0.3 to 0.5.

[0009] Preferably, the non-independent filling groove includes a wide groove section and a narrow groove section, the narrow groove section is located close to the slit groove, the wide groove section is located away from the slit groove, and the width of the narrow groove section is smaller than the width of the wide groove section.

[0010] Preferably, a step is formed at the connection point between the narrow groove segment and the wide groove segment.

[0011] Preferably, both the narrow and wide slots are constant width structures.

[0012] Preferably, the width of the narrow slot decreases along the direction away from the wide slot.

[0013] Preferably, the length of the narrow groove section along the d-axis is C1, and the length of the wide groove section along the d-axis is C2, where C1 / C2 = 1 / 3 to 1 / 2.

[0014] Preferably, a dividing rib is formed between the non-independent filling groove and the slit groove. The width of the dividing rib farthest from the d-axis along the d-axis direction is L1, and the width of the dividing rib 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.

[0015] Preferably, a dividing rib is formed between the non-independent filling groove and the slit groove. The dividing rib farthest from the d-axis has a width of L1 along the d-axis direction. The dividing ribs between the non-independent filling groove and the slit groove, which have unequal widths in the q-axis direction, have a width less than or equal to L1 along the d-axis direction.

[0016] Preferably, a dividing rib is formed between the non-independent filling groove and the slit groove, and the plane on the side of the dividing rib is parallel to or intersects the plane on the q-axis.

[0017] Preferably, the filling groove further includes a q-axis filling groove, which is disposed on the outer circumference of the rotor core near the q-axis. The sum of the widths of the q-axis filling groove and the slit groove along the q-axis direction is d1+∑d2, and the width from the rotor shaft hole to the outer circle of the rotor is d3, where (d1+∑d2) / d3=0.3~0.5.

[0018] Preferably, (d1+∑d2) / d3=0.32~0.48.

[0019] Preferably, (d1+∑d2) / d3=0.36~0.42.

[0020] Preferably, the minimum width of the magnetic channel between two adjacent non-independent filling slots is W, and the minimum width of the magnetic channel between the slit slots in the same layer as the two non-independent filling slots is d, where W≥d.

[0021] Preferably, the non-independent filling grooves and slit grooves in the same layer form a magnetic barrier layer, the minimum width of the magnetic channel 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, and h1≥1.5h2.

[0022] Preferably, the filling groove further includes a q-axis filling groove, which is disposed on the outer circumference of the rotor core near the q-axis. On the cross section perpendicular to the central axis of the rotor core, the included angle α1 formed by the lines connecting the two ends of the q-axis filling groove and the central axis of the rotor core satisfies 20°≤α1≤60°.

[0023] Preferably, 30°≤α1≤50°.

[0024] Preferably, the distance between the innermost magnetic barrier layer closest to the rotor shaft hole and the outer circle of the rotor is h3, and the distance between the outermost magnetic barrier layer furthest from the rotor shaft hole 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.

[0025] Preferably, 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.

[0026] Preferably, 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.

[0027] Preferably, the slit groove includes an arc segment and / or a straight segment. When the slit groove includes an arc segment, the curvature of the arc segment 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 slit groove in the same layer is greater than that of the inner circle.

[0028] Preferably, the slit groove includes arc segments and / or straight segments, and the width of the slit groove increases in the q-axis direction along both sides from the q-axis.

[0029] 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.

[0030] Preferably, the rotor shaft hole is composed of arc segments and / or straight segments.

[0031] Preferably, 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 at both ends of the rotor core to form a squirrel cage.

[0032] Preferably, the motor rotor further includes a rotor baffle, which is disposed between the end ring and the rotor core.

[0033] Preferably, the rotor baffle is provided with a connecting groove, and the total area of ​​the connecting groove on the rotor baffle is less than or equal to the total area of ​​the filling groove on the rotor core.

[0034] Preferably, the connecting slots on the rotor baffle are in the same position as the filling slots on the rotor core, and the area of ​​a single connecting slot on the rotor baffle is less than or equal to the area of ​​a single filling slot on the rotor core at the same position.

[0035] Preferably, the maximum width of the connecting slot along the q-axis is less than or equal to the maximum width of the filling slot at the same position on the rotor core along the q-axis.

[0036] 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 on the q-axis is greater than or equal to the maximum width on the d-axis.

[0037] Preferably, the thickness of the rotor baffle along the stacking direction of the rotor core is greater than or equal to the thickness of the rotor laminations forming the rotor core in that direction.

[0038] Preferably, the total area of ​​the slits on the rotor core located on the inner circumferential side of the inner hole of the rotor baffle accounts for at least 40% of the total area of ​​the motor flow hole.

[0039] 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 face of the end ring is greater than or equal to the maximum distance from the center of the rotor core to the end face of the rotor baffle.

[0040] According to another aspect of this application, a self-starting synchronous reluctance motor is provided, including a motor rotor, which is the motor rotor described above.

[0041] The motor rotor provided in this application includes a rotor core with filling slots and slit slots. The filling slots include non-independent filling slots, which are located on both sides of the slit slots. The slit slots and the non-independent filling slots on both sides of the slit slots are arranged in the same layer. Along the direction from the outer circle of the rotor to the rotor shaft hole, at least some of the non-independent filling slots have unequal widths along the q-axis, and the width of the non-independent filling slot closest to the slit slot is the minimum width of the non-independent filling slot. This motor rotor optimizes the structure of at least some of the non-independent filling slots, making the widths of at least some of the non-independent filling slots unequal along the q-axis from the outer circle of the rotor to the rotor shaft hole. This ensures that the filling slots have a certain area while also allowing them to have a narrow and deep shape. A filling slot with a certain area ensures the motor's pull torque, while a narrow and deep filling slot increases the motor's starting torque, improving the motor's pull synchronization capability and starting ability. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the rotor core of an electric motor rotor according to one embodiment of this application;

[0043] Figure 2 This is a schematic diagram of the rotor baffle according to one embodiment of this application;

[0044] Figure 3 This is a schematic diagram of the structure of a motor rotor according to an embodiment of this application;

[0045] Figure 4 This is a schematic diagram of the rotor core of an electric motor rotor according to one embodiment of this application;

[0046] Figure 5 This is a schematic diagram of the rotor baffle according to one embodiment of this application;

[0047] Figure 6 This is a comparison diagram of the rotational speeds of a motor according to an embodiment of this application and motors in related technologies during the starting process;

[0048] Figure 7 This is a comparison diagram of the pull torque of a motor according to an embodiment of this application and a motor of related technologies.

[0049] The reference numerals in the attached figures are as follows:

[0050] 1. Rotor core; 2. Slit slot; 3. Non-independent filling slot; 4. q-axis filling slot; 5. Dividing rib; 6. Rotor shaft hole; 7. Magnetic guide channel; 8. Wide slot section; 9. Narrow slot section; 10. Rotor baffle; 11. Connecting slot; 12. End ring. Detailed Implementation

[0051] See also Figures 1 to 7 As shown, according to an embodiment of this application, the motor rotor includes a rotor core 1, on which a filling groove and a slit groove 2 are provided. The filling groove includes a non-independent filling groove 3, which is disposed on both sides of the slit groove 2. The slit groove 2 and the non-independent filling grooves 3 on both sides of the slit groove 2 are disposed in the same layer. Along the direction from the outer circle of the rotor to the rotor shaft hole 6, at least some of the non-independent filling grooves 3 have different widths in the q-axis direction, and the width of the non-independent filling groove 3 on the side closer to the slit groove 2 is the minimum width of the non-independent filling groove 3.

[0052] The structure of at least some of the non-independent filling slots 3 of the motor rotor has been optimized so that the width of at least some of the non-independent filling slots 3 along the q-axis from the outer circle side of the rotor to the rotor shaft hole 6 side is not equal. This can ensure that the filling slots have a certain area and that the filling slots have a narrow and deep shape. The filling slots with a certain area can ensure the motor's pull torque, while the narrow and deep filling slots can increase the motor's starting torque and improve the motor's pull synchronization capability and starting capability.

[0053] The slit slot 2 and the part near the slit slot 2 of the rotor core 1 are the weakest points in the rotor's mechanical strength. The width of the filling groove on the side near the slit slot 2 along the q-axis is the minimum value of the width of the filling groove along the q-axis. This can increase the area of ​​the rotor core 1 that can withstand pressure near the slit slot 2, thereby reducing the deformation of the rotor during the manufacturing process, which helps to increase the mechanical strength of the rotor core 1 and reduce the difficulty of the process.

[0054] In one embodiment, the maximum width of the non-independent filling groove 3 in the q-axis direction is m, the minimum width is m1, and m1 / m = 0.1 to 0.6.

[0055] Preferably, m1 / m = 0.2 to 0.5.

[0056] More preferably, m1 / m = 0.3 to 0.5.

[0057] The minimum width of the filling groove near the slit groove 2 is limited so that, on the one hand, the filling groove area is reduced due to the value being too small, which would lead to a decrease in the pull-in torque; on the other hand, the effect of a narrow and deep filling groove is not obvious due to the value being too large, which would lead to a decrease in its starting torque.

[0058] In one embodiment, the non-independent filling groove 3 includes a wide groove segment 8 and a narrow groove segment 9. The narrow groove segment 9 is located close to the slit groove 2, while the wide groove segment 8 is located away from the slit groove 2. The width of the narrow groove segment 9 is smaller than the width of the wide groove segment 8. In this embodiment, segmenting the width of the non-independent filling groove 3 allows for optimized design of the structure of non-independent filling groove 3 with inconsistent widths along the d-axis direction. It also reduces the processing difficulty of this type of non-independent filling groove 3, enabling it to be manufactured in a simpler and faster manner to meet the starting and operating requirements of the motor.

[0059] In one embodiment, a step is formed at the connection point between the narrow slot segment 9 and the wide slot segment 8. The narrow slot segment 9 can be a constant width structure or a trapezoidal structure; it only needs to form a step structure at the connection point with the wide slot segment 8.

[0060] In one embodiment, both the narrow groove segment 9 and the wide groove segment 8 are constant width structures. In this embodiment, both the narrow groove segment 9 and the wide groove segment 8 adopt a rectangular structure, with one side of each being flush, specifically, the side furthest from the d-axis. The width and position of the other side of each segment are different, thus forming a stepped structure. This allows the non-independent filling groove 3 to form a wider filling groove structure at the end furthest from the slit groove 2, and a narrower and deeper filling groove structure at the end closest to the slit groove 2, better meeting the design requirements.

[0061] In one embodiment, the narrow slot 9 decreases in width along the direction away from the wide slot 8. In this embodiment, the wide slot 8 adopts a rectangular constant-width structure, the narrow slot 9 adopts a trapezoidal structure, and the narrow slot 9 has the same width at the connection position with the wide slot 8, thereby decreasing in width along the direction away from the wide slot 8, and reaching its minimum width near the end of the slit slot 2.

[0062] In one embodiment, the length of the narrow groove segment 9 along the d-axis is C1, and the length of the wide groove segment 8 along the d-axis is C2, where C1 / C2 = 1 / 3 to 1 / 2. This ensures that the filling groove area is not reduced due to the excessive length of the narrow groove segment 9 along the d-axis, and also limits the minimum value of this value to ensure that the filling groove has a narrow and deep effect, thus guaranteeing the pull-in torque and starting torque.

[0063] In one embodiment, 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, where L1 ≥ L2 and L1 ≥ 0.5 * σ, where σ is the width of the air gap between the stator and the rotor. The dividing rib 5 can enhance the mechanical strength of the rotor core 1; limiting the minimum width of the dividing rib 5 can reduce the processing difficulty and improve the mechanical strength of the rotor; L1 ≥ L2 can reduce the leakage flux of the inner magnetic barrier layer and improve the motor efficiency.

[0064] In one embodiment, a dividing rib 5 is formed between the non-independent filling groove 3 and the slit groove 2. The dividing rib 5 furthest from the d-axis has a width L1 along the d-axis direction. The dividing ribs 5 with unequal widths along the q-axis direction between the non-independent filling groove 3 and the slit groove 2 have a width less than or equal to L1 along the d-axis direction. The non-independent filling groove 3 with unequal widths along the q-axis direction can enhance the mechanical strength at the slit groove 2 of the magnetic barrier layer. In this case, a smaller width dividing rib 5 can be used to reduce magnetic leakage and improve motor efficiency.

[0065] In one embodiment, a dividing rib 5 is formed between the non-independent filling groove 3 and the slit groove 2. The plane on which the side of the dividing rib 5 is located is parallel to or intersects the plane on which the q-axis is located. The ribs can be arranged in a staggered manner according to the direction of the rotor leakage magnetic field lines to reduce rotor leakage magnetic field.

[0066] In one embodiment, the filling groove further includes a q-axis filling groove 4, which is disposed 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. (d1 + ∑d2) / d3 = 0.3 to 0.5, thereby allowing for the selection of a reasonable magnetic barrier ratio, ensuring both sufficient magnetic barrier width and a reasonable magnetic flux channel, increasing the saliency ratio of the motor while preventing magnetic circuit oversaturation.

[0067] Preferably, (d1+∑d2) / d3=0.32~0.48.

[0068] More preferably, (d1+∑d2) / d3=0.36~0.42.

[0069] In one embodiment, 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 in the same layer as the two non-independent filling slots 3 is d, where W≥d. The purpose is to ensure that there is sufficient width between the filling slots to avoid magnetic field saturation and affect the magnetic flux flow between the channels of the magnetic barrier layers.

[0070] In one embodiment, the non-independent filling slots 3 and slit slots 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, and the minimum width along the q-axis of the magnetic barrier layer with the smaller width among the two adjacent magnetic barrier layers is h2, where h1 ≥ 1.5h2. The multi-layer magnetic barrier structure provides reluctance torque to the motor, enabling the motor to operate synchronously; h1 ≥ 1.5h2, this setting can reduce the difficulty of rotor processing and ensure the uniformity and unsaturation of rotor magnetic flux density distribution.

[0071] In one embodiment, the filling groove further includes a q-axis filling groove 4, which is disposed on the outer circumference of the rotor core 1 near the q-axis. On a 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°.

[0072] Preferably, 30°≤α1≤50°. This configuration forms a magnetic barrier layer and serves as a filling groove, which can act as both a magnetic barrier layer to increase the reluctance torque of the motor and a starting squirrel cage to improve the starting performance of the motor.

[0073] In one embodiment, 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, where 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 means that the filling groove is either an open groove or a closed groove. When the filling groove is a closed groove, limiting its maximum distance from the outer circle of the rotor 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.

[0074] In one embodiment, 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.

[0075] Preferably, 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.

[0076] By limiting the ratio 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 guaranteed, so that the motor has a certain load-bearing starting capability.

[0077] In one embodiment, the slit groove 2 includes an arc segment and / or a straight segment. When the slit groove 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 curvature of the outer circle of the slit groove 2 in the same layer is greater than that of the inner circle.

[0078] In one embodiment, the slit groove 2 includes arc segments and / or straight segments, and the width of the slit groove 2 increases in the q-axis direction along both sides from the q-axis.

[0079] By using the above configuration, the utilization rate of rotor space can be increased, and the slots can be arranged reasonably to increase the rotor salient pole ratio and improve the motor reluctance torque.

[0080] 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. This arrangement can increase the utilization rate of the rotor space, so as to reasonably arrange the slit slots, increase the rotor salient pole ratio, and improve the motor reluctance torque.

[0081] In one embodiment, the rotor shaft hole 6 is composed of arc segments and / or straight segments. The rotor shaft hole 6 is located at the center of the rotor, and its presence affects the arrangement of the magnetic barrier layer. The rotor shaft hole 6 is not limited to being circular; that is, the rotor shaft hole 6 can be elliptical, quasi-elliptical, or quadrilateral, which can increase the space for the magnetic barrier layer on the rotor and further improve the output torque of the motor.

[0082] In one embodiment, at least a portion of the filling slots are 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, forming a squirrel cage. In this embodiment, the filling slots include at least a portion of the q-axis filling slot 4 and the non-independent filling slot 3, filled with a conductive but non-magnetic material. The filling slots are self-short-circuited through the end rings 12 at both ends of the rotor, forming a squirrel cage structure. The material of the end rings 12 is the same as the material filled in the filling slots. The self-short-circuited squirrel cage structure provides asynchronous torque during the motor starting phase to achieve self-starting of the motor; the multi-layer magnetic barrier structure provides reluctance torque to the motor to achieve synchronous operation of the motor.

[0083] In one embodiment, the motor rotor further includes a rotor baffle 10, which is disposed between the end ring 12 and the rotor core 1. By providing the rotor baffle 10, the rotor core 1 and the end ring 12 can be connected. If the rotor baffle 10 is not provided, the slit groove 2 will be filled with filling material during the filling of the filling groove and the manufacture of the end ring 12, which wastes the filling material and reduces the reliability of the rotor. The rotor baffle 10 can complete the filling of the filling groove and the manufacture of the end ring 12 while ensuring that the slit groove 2 is an air groove.

[0084] In one embodiment, the rotor baffle 10 is provided with a connecting groove 11, and the total area of ​​the connecting groove 11 on the rotor baffle 10 is less than or equal to the total area of ​​the filling groove on the rotor core 1. The connecting groove 11 on the rotor baffle 10 is the inlet for filling material into the filling groove on the rotor core 1. Providing the connecting groove 11 on the rotor baffle 10 allows the filling material to enter the filling groove on the rotor core 1. Ensuring that the total area of ​​the connecting groove 11 on the rotor baffle 10 is not greater than the total area of ​​the filling groove on the rotor core 1 can reduce the stress area of ​​the non-filling groove part of the rotor core 1 during material filling, ensuring its mechanical strength during the material filling process and reducing the amount of deformation.

[0085] In one embodiment, the connecting groove 11 provided on the rotor baffle 10 is in the same position as the filling groove provided on the rotor core 1. The area of ​​a single connecting groove 11 on the rotor baffle 10 is less than or equal to the area of ​​a single filling groove on the rotor core 1 at the same position, which can reduce the local deformation of the rotor core 1 when filling material.

[0086] In one embodiment, the maximum width of the connecting groove 11 along the q-axis is less than or equal to the maximum width of the filling groove at the same position on the rotor core 1 along the q-axis, so as to reduce the inward or outward concave deformation of the rotor core 1 along the q-axis when filling material.

[0087] A filling groove of unequal width is provided on the rotor core 1 along the q-axis from the outer circle side of the rotor to the rotor shaft hole side. The different widths of the filling grooves are not limited to stepped or smooth connections. In one embodiment, they are stepped connections, and in another embodiment, they are smooth connections.

[0088] Furthermore, the connecting groove 11 provided on the rotor baffle 10 can take various forms. Optionally, the portion of each filling groove provided on the rotor core 1 from the minimum width along the q-axis direction to the rotor inner hole side may not be reflected in the structure of the connecting groove 11 of the rotor baffle 10. In the first embodiment, the portion of the filling groove from the minimum width along the q-axis direction to the rotor inner hole side is not reflected in the structure of the connecting groove 11 of the rotor baffle 10; in the second embodiment, the portion of the filling groove from the minimum width along the q-axis direction to the rotor inner hole side is reflected in the structure of the connecting groove 11 of the rotor baffle 10.

[0089] In one embodiment, 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. As part of the motor rotor, the outer contour of the rotor baffle 10 must not be greater than the outer diameter of the rotor core 1 to form an air gap with a certain width between it and the stator; the q-axis width of its inner contour corresponding to the slot 2 of the rotor core 1 must not be less than the d-axis width, so that a sufficient area of ​​the slot 2 can directly contact the air, forming a flow hole and increasing rotor heat dissipation.

[0090] 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 that direction, so as to ensure the mechanical strength of the rotor core 1.

[0091] In one embodiment, the total area of ​​the slits 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 holes, so as to ensure that a sufficient area of ​​slits 2 is in direct contact with air to form flow holes and increase rotor heat dissipation.

[0092] 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 portion of the rotor core 1 located on the outer circumference side of the rotor that is not covered by the rotor baffle 10 is subjected to stress during material filling, thus 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, ensuring that the rotor has an end ring 12 with a certain volume, which helps improve the motor's starting capability.

[0093] See also Figure 6 and Figure 7 As shown, compared with the motors of related technologies, the motors of the present application embodiments have significantly improved starting capability and traction torque.

[0094] According to an embodiment of this application, the self-starting synchronous reluctance motor includes a motor rotor, which is the motor rotor described above.

[0095] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0096] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this 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). The non-independent filling groove (3) is provided on both sides of the slit groove (2). The slit groove (2) and the non-independent filling groove (3) on both sides of the slit groove (2) are provided in the same layer. Along the direction from the outer circle of the rotor to the rotor shaft hole (6), at least some of the non-independent filling grooves (3) have different widths in the q-axis direction. The width of the non-independent filling groove (3) on the side closer to the slit groove (2) is the minimum width of the non-independent filling groove (3). The non-independent filling groove (3) includes a wide groove section (8) and a narrow groove section (9). The narrow groove section (9) is located close to the slit groove (2), and the wide groove section (8) is located away from the slit groove (2). The width of the narrow groove section (9) is smaller than the width of the wide groove section (8). The length of the narrow groove section (9) along the d-axis is C1, and the length of the wide groove section (8) along the d-axis is C2. C1 / C2 = 1 / 3 to 1 / 2.

2. The motor rotor according to claim 1, characterized in that, The maximum width of the non-independent filling groove (3) in the q-axis direction is m, and the minimum width is m1, where m1 / m = 0.1~0.

6.

3. The motor rotor according to claim 2, characterized in that, m1 / m = 0.2~0.

5.

4. The motor rotor according to claim 3, characterized in that, m1 / m = 0.3~0.

5.

5. The motor rotor according to claim 1, characterized in that, A step is formed at the connection point between the narrow groove segment (9) and the wide groove segment (8).

6. The motor rotor according to claim 5, characterized in that, Both the narrow slot segment (9) and the wide slot segment (8) are constant width structures.

7. The motor rotor according to claim 1, characterized in that, The width of the narrow slot (9) decreases in the direction away from the wide slot (8).

8. 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.

9. 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 dividing rib (5) furthest from the d-axis has a width of L1 along the d-axis direction. The dividing rib (5) between the non-independent filling groove (3) and the slit groove (2) with unequal widths along the q-axis direction has a width less than or equal to L1 along the d-axis direction.

10. 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.

11. 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. 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. The width from the rotor shaft hole (6) to the outer circle of the rotor is d3, and (d1+∑d2) / d3=0.3~0.

5.

12. The motor rotor according to claim 11, characterized in that, (d1+∑d2) / d3=0.32~0.

48.

13. The motor rotor according to claim 11, characterized in that, (d1+∑d2) / d3=0.36~0.

42.

14. 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, W≥d.

15. 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.

16. 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°.

17. The motor rotor according to claim 16, characterized in that, 30°≤α1≤50°。 18. 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.

19. 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).

20. The motor rotor according to claim 19, 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).

21. 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.

22. 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.

23. 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.

24. The motor rotor according to claim 23, characterized in that, The rotor shaft hole (6) is composed of arc segments and / or straight segments.

25. The motor rotor according to any one of claims 1 to 24, 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.

26. The motor rotor according to claim 25, characterized in that, The motor rotor also includes a rotor baffle (10), which is disposed between the end ring (12) and the rotor core (1).

27. The motor rotor according to claim 26, characterized in that, The rotor baffle (10) is provided with a connecting groove (11), and the total area of ​​the connecting groove (11) on the rotor baffle (10) is less than or equal to the total area of ​​the filling groove on the rotor core (1).

28. The motor rotor according to claim 27, 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.

29. The motor rotor according to claim 27, 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.

30. The motor rotor according to claim 26, 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.

31. The motor rotor according to claim 26, 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.

32. The motor rotor according to claim 26, characterized in that, The total area of ​​the slit groove (2) on the inner circumferential side of the inner hole of the rotor core (1) accounts for at least 40% of the total area of ​​the motor flow hole.

33. The motor rotor according to claim 26, 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).

34. 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 33.

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