Rotor end ring, rotor and motor

Abstract

The invention provides a rotor end ring, a rotor and a motor, the middle part of the rotor end ring is provided with a baffle plate mounting hole penetrating through two ends, and the baffle plate mounting hole comprises a circular hole body and a groove arranged on the inner wall of the circular hole body. Compared with the circular hole design of the baffle plate mounting hole in the prior art, the inner wall of the circular hole body is provided with the groove, and air is formed in the groove, so that the resistance of the rotor end ring is increased (the resistivity of the air is far greater than the aluminum material of the rotor end ring), the starting torque can be enhanced, and the starting capability of the motor is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric machines, and particularly relates to a rotor end ring, a rotor and an electric machine. BACKGROUND

[0002] The self-starting permanent magnet auxiliary synchronous reluctance motor is based on the permanent magnet auxiliary synchronous reluctance motor, combines the advantages of asynchronous motors, and uses the asynchronous torque generated by the rotor cage to realize self-starting, and has no rotor copper loss, so it has high efficiency. The permanent magnet auxiliary synchronous reluctance motor combines the permanent magnet synchronous motor and the synchronous reluctance motor, and fully utilizes the permanent magnet torque and the reluctance torque.

[0003] Among them, the self-starting permanent magnet auxiliary synchronous reluctance motor in the prior art generally uses the rotor end ring to cooperate with the conductive bars in the filling slot on the rotor core to form a squirrel cage. The rotor end ring is arranged at the end of the rotor core and is opposite to and electrically connected with the end of each conductive bar. The rotor end ring is generally in the shape of a circular ring. Specifically, the middle part of the rotor end ring is provided with a baffle mounting hole penetrating through both ends, and the baffle mounting hole is used for mounting a rotor baffle to stop and position the magnetic steel on the rotor core. The baffle mounting hole is generally a circular hole. The design of the circular hole of the baffle mounting hole easily leads to low starting torque of the motor, which is not conducive to the starting of the motor, so the problem needs to be solved. SUMMARY

[0004] Therefore, the application provides a rotor end ring, a rotor and an electric machine, which can solve the technical problem that the design of the circular hole of the baffle mounting hole in the prior art easily leads to low starting torque of the motor, which is not conducive to the starting of the motor.

[0005] In order to solve the above problems, the application provides a rotor end ring, wherein the middle part is provided with a baffle mounting hole penetrating through both ends, and the baffle mounting hole comprises a circular hole body and a groove provided on the inner wall of the circular hole body.

[0006] In some embodiments, the diameter of the circular hole body is D7; in a cross section perpendicular to the center line of the circular hole body, the maximum distance from the bottom surface of the groove to the center of the circular hole body is D8 / 2; wherein the outer diameter of the rotor core corresponding to the rotor end ring is D, 0.6*D ≤ D7 ≤ 0.7*D, and 0.92*D ≤ D8 ≤ 0.95*D.

[0007] In some embodiments, the two groove walls of the groove are parallel; or the two groove walls of the groove are relatively opened to form an expanded groove.

[0008] In some embodiments, the center line of the circular hole is coincident with the axis of the rotor end ring, and the number of the grooves is equal to the number of the magnetic poles on the rotor core corresponding to the rotor end ring; wherein each of the grooves is uniformly spaced in the circumferential direction of the rotor end ring.

[0009] The application also provides a rotor comprising a rotor core and the rotor end ring of any one of claims 1-4; the rotor end ring is arranged at the end of the rotor core, and the grooves are arranged at the magnetic steel in the magnetic pole on the rotor core.

[0010] In some embodiments, when the number of the grooves is equal to the number of the magnetic poles on the rotor core, each of the grooves is arranged at the magnetic steel in the corresponding magnetic pole.

[0011] In some embodiments, in the projection plane along the axial direction of the rotor, the outer shape profile of the magnetic steel in the magnetic pole is entirely located inside the baffle mounting hole; or part of the profile segment of the outer shape profile of the magnetic steel in the magnetic pole is located inside the baffle mounting hole, and part of the profile segment is coincident with the hole wall of the baffle mounting hole.

[0012] In some embodiments, the rotor core has two or more magnetic pole forming regions corresponding to the magnetic poles of the rotor, and each of the magnetic pole forming regions is provided with a magnetic barrier groove structure; the magnetic barrier groove structure is symmetrical about the d-axis in the magnetic pole forming region and forms a flare structure towards the outer peripheral side of the rotor core; the bottom of the magnetic barrier groove structure has a magnetic steel groove located on the d-axis, and the magnetic barrier groove structure further comprises two filling grooves which are symmetrical about the d-axis and extend laterally; wherein each of the magnetic steel grooves is mounted with a magnetic steel.

[0013] In some embodiments, in the magnetic pole forming region, the number of the magnetic barrier groove structures is two or more and is sequentially and uniformly spaced along the d-axis.

[0014] In some embodiments, the included angle between the two filling grooves in the magnetic barrier groove structure is α, and in the d-axis direction, the closer to the outer peripheral side of the rotor core, the smaller the corresponding included angle α of the magnetic barrier groove structure;

[0015] And / or, in the magnetic pole forming region, in the d-axis direction, the closer to the outer peripheral side of the rotor core, the smaller the area of the internal filling groove of the magnetic barrier groove structure.

[0016] In some embodiments, the magnetic barrier groove structure in the d-axis direction closest to the outer wall of the rotor core in each magnetic barrier groove structure in the magnetic pole forming region is defined as the first B magnetic barrier groove structure.

[0017] In the magnetic pole forming region, the thickness of the magnetic steel in the first B magnetic barrier groove structure is greater than the thickness of the magnetic steel in other magnetic barrier groove structures, or the thickness of the magnetic steel in each magnetic barrier groove structure is equal.

[0018] In some embodiments, when the thickness of the magnetic steel in the first B magnetic barrier groove structure is greater than the thickness of the magnetic steel in other magnetic barrier groove structures in the magnetic pole forming region, wherein,

[0019] In the magnetic pole forming region, the number of magnetic barrier groove structures is three or more, and the thickness of the magnetic steel in each magnetic barrier groove structure other than the first B magnetic barrier groove structure is equal.

[0020] And / or, the thickness of the magnetic steel in the first B magnetic barrier groove structure is at least 1.1 times greater than the thickness of the magnetic steel in other magnetic barrier groove structures.

[0021] In some embodiments, in the magnetic pole forming region, any two adjacent magnetic barrier groove structures are defined as a first A magnetic barrier groove structure and a second A magnetic barrier groove structure, respectively, and the second A magnetic barrier groove structure is closer to the outer circumferential side of the rotor core in the d-axis direction relative to the first A magnetic barrier groove structure; wherein the width of the magnetic steel in the first A magnetic barrier groove structure is L1, the width of the magnetic steel in the second A magnetic barrier groove structure is L2, and L1≥L2.

[0022] In some embodiments, in a cross section perpendicular to the axis of the rotor core, each of the filling grooves has opposite first and second side walls in the width direction, and each of the filling grooves has a width tapering end opposite the outer wall of the rotor core, the bottom of the width tapering end has opposite first and second end points, and the width tapering end is connected to the first side wall through the first end point and connected to the second side wall through the second end point; wherein the top of each width tapering end is located on a circle with a diameter D1, and each first end point and each second end point is located on a circle with a diameter D2, the outer diameter of the rotor core is D, and 1.2*D2<1.05*D1<D.

[0023] In some embodiments, the rotor core is provided with a q-axis filling groove on the q-axis between two adjacent magnetic pole forming regions; wherein in a cross section perpendicular to the axis of the rotor core, the maximum distance between the q-axis filling groove and the center of the rotor core is D3, the minimum distance between the q-axis filling groove and the center of the rotor core is D4, the outer diameter of the rotor core is D, and 0.15*D≤D3-D4≤0.2*D.

[0024] In some embodiments, the magnetic steel groove and the two adjacent filling grooves in the magnetic barrier groove structure form a first magnetic bridge, the width of the first magnetic bridge is w10, and 0 w10≤ 2σ, σ is the air gap width between the rotor and the stator of the corresponding motor; or, the magnetic steel slot and the two adjacent filling slots in the magnetic barrier slot structure are all through.

[0025] In some embodiments, a second magnetic bridge is formed between each of the filling slots and the outer wall of the rotor core, the width of the second magnetic bridge is w11, 0 w11≤ 2σ, σ is the air gap width between the rotor and the stator of the corresponding motor; or, each of the filling slots is through the outer wall of the rotor core.

[0026] In some embodiments, in the magnetic pole forming area, the number of magnetic barrier slot structures is more than three, the distance between the magnetic steel slots in adjacent two magnetic barrier slot structures is k, the adjacent two magnetic barrier slot structures are defined as a magnetic barrier slot group, and in the d-axis direction, the closer to the outer peripheral side of the rotor core, the smaller the corresponding k.

[0027] In some embodiments, each of the magnetic barrier slot structures in the magnetic pole forming area includes a first magnetic barrier slot structure, a second magnetic barrier slot structure, a third magnetic barrier slot structure and a fourth magnetic barrier slot structure arranged in turn outward along the radial direction of the rotor core, wherein the distance between the magnetic steel slots in the first magnetic barrier slot structure and the second magnetic barrier slot structure is k1, the distance between the magnetic steel slots in the second magnetic barrier slot structure and the third magnetic barrier slot structure is k2, and the distance between the magnetic steel slots in the third magnetic barrier slot structure and the fourth magnetic barrier slot structure is k3, k1>1.1*k2>1.3*k3.

[0028] In some embodiments, the rotor core is further provided with a fixing hole for the baffle fastener to pass through; in the cross section perpendicular to the axis of the rotor core, the distance between the center of the fixing hole and the center of the rotor core is D5, and the inner diameter of the rotor core is D6, 1.15*D6 ≤ D5 ≤ 1.2*D6.

[0029] The application also provides an electric machine comprising the rotor end ring of any one of the above-mentioned embodiments; or comprising the rotor of any one of the above-mentioned embodiments.

[0030] The rotor end ring, the rotor and the electric machine provided by the application have the following beneficial effects:

[0031] 1. Compared with the circular hole design of the baffle mounting hole in the prior art, the application forms a groove on the inner wall of the circular hole body, so that the groove becomes air, thereby increasing the resistance of the rotor end ring (the resistivity of air is much greater than that of the aluminum material of the rotor end ring), which can enhance the starting torque and improve the starting ability of the electric machine.

[0032] 2. Compared with the prior art where the included angle α corresponding to each magnetic barrier slot structure is designed to be consistent, the present invention designs the included angle α corresponding to each magnetic barrier slot structure to gradually decrease in the radial outward direction along the rotor core. This can optimize the gradient of the magnetic reluctance path, smooth the overall magnetic reluctance, and optimize the air gap magnetic field distribution, thereby suppressing the high-order harmonics of the cogging torque and reducing torque pulsation.

[0033] 3. This invention ensures sufficient filling slot area to provide starting torque by rationally allocating the width of the magnet slot and the filling slot; adjusts the filling slot opening angle and controls the size of the filling slot tipping angle to improve the air gap magnetic field distribution and reduce torque pulsation; inserts magnets, such as permanent magnets, into the magnet slot, and allocates permanent magnets according to the motor demagnetization characteristics to ensure the magnets' anti-demagnetization ability and improve the consistency of anti-demagnetization; limits the thickness of the magnets and the magnetic channel to ensure sufficient rotor space and reduce rotor saturation. Attached Figure Description

[0034] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0035] Figure 1 This is a partial structural diagram of a rotor provided in one embodiment of the present invention;

[0036] Figure 2 Is with Figure 1 A schematic diagram of the baffle that fits the rotor end ring;

[0037] Figure 3 This is a partial schematic diagram of another rotor provided in one embodiment of the present invention;

[0038] Figure 4 Is with Figure 3 A schematic diagram of the baffle that fits the rotor end ring;

[0039] Figure 5 This is a schematic diagram of a rotor with a hidden rotor end ring according to an embodiment of the present invention;

[0040] Figure 6 It reflects Figure 5 A schematic diagram of the dimensions of the middle structure;

[0041] Figure 7 yes Figure 6 Enlarged view of point A in the middle;

[0042] Figure 8A graph showing the variation of torque with time for both the motor of the present application and the motor of the prior art is shown.

[0043] Figure 9 A graph showing the variation of magnetic density with time for both the outer layer magnetic steel of the motor of the present application and the motor of the prior art is shown.

[0044] Figure 10 A graph showing the relationship between the harmonic value and the harmonic number for both the motor of the present application and the motor of the prior art is shown.

[0045] The reference signs are: 1, rotor; 3, rotor core; 4, magnetic barrier slot structure; 5, magnetic steel; 9, fixing hole; 10, rotor end ring; 11, magnetic pole forming area; 12, baffle; 13, bar; 4a, filling slot; 4b, magnetic steel slot; 40, first B magnetic barrier slot structure; 41, first magnetic barrier slot structure; 42, second magnetic barrier slot structure; 43, third magnetic barrier slot structure; 44, fourth magnetic barrier slot structure; 45, q-axis filling slot; 46, first A magnetic barrier slot structure; 47, second A magnetic barrier slot structure; 81, first magnetic bridge; 82, second magnetic bridge; 4a1, first side wall; 4a2, second side wall; 4a3, width tapered end; 4a4, top; 4a5, first end point; 4a6, second end point; 10a, baffle mounting hole; 101, circular hole body; 102, groove. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0047] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0048] For purposes of the description hereinafter, spatially relative terms, such as "above", "below", "up", "down", "between", "within", "left", "right", "rear", "front", "upper", "lower", "horizontal", "vertical", "above", "below", "up", "down", "top", "bottom", "under", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. The terms "first", "second", "third", etc., do not necessarily indicate any ordinal, chronological or other sequence unless expressly stated to do so.

[0049] In addition, it should be noted that the use of "first", "second", etc. words to define parts, only for the convenience of the corresponding parts, as there is no declaration, the above words have no special meaning, therefore can not be understood as limiting the scope of protection of the present application.

[0050] For reference Figure 1 As shown, according to the embodiment of the present application, a rotor end ring 10 is provided, wherein a baffle mounting hole 10a is provided through both ends, and the baffle mounting hole 10a includes a circular hole body 101 and a groove 102 provided on the inner wall of the circular hole body 101.

[0051] Compared with the circular hole design of the baffle mounting hole in the prior art, the present application forms a groove 102 on the inner wall of the circular hole body 101, so that the groove 102 becomes air, thereby increasing the resistance of the rotor end ring 10 (the resistivity of air is much greater than that of the aluminum material of the rotor end ring 10), so that the starting torque can be enhanced, and the starting ability of the motor can be improved.

[0052] Figure 8 A torque-time curve of both the motor of the present application and the motor of the prior art is shown. The motor of the present application uses the above-mentioned rotor end ring 10, and the rotor end ring 10 satisfies: the baffle mounting hole 10a includes a circular hole body 101 and a groove 102 provided on the inner wall of the circular hole body 101. From Figure 8 It can be seen that, compared with the prior art, the technical scheme of the present application can enhance the starting torque, thereby improving the starting ability of the motor.

[0053] In some embodiments, as Figure 1As shown, the diameter of the circular hole body 101 is D7. In the cross section perpendicular to the center line of the circular hole body 101, the maximum distance from the center of the circular hole body 101 to the bottom surface of the groove 102 is D8 / 2. Wherein, the outer diameter of the rotor end ring 10 corresponding to the rotor core 3 is D, 0.6*D ≤ D7 ≤ 0.7*D, and 0.92*D ≤ D8 ≤ 0.95*D.

[0054] In the above example, by controlling the depth of the groove 102 and the size of the circular hole body 101, the filling area of the rotor end ring 10 can be reasonably set, the resistance of the rotor end ring 10 is increased, and the rotor end ring 10 has sufficient structural strength.

[0055] In one example, as shown in Figure 1 The two opposite groove walls of the groove 102 can be arranged in parallel to form a rectangular groove. Figure 3 In another example, as shown in The two opposite groove walls of the groove 102 can be relatively flared to form a flared groove, which is beneficial to simplify the overall machining process of the rotor end ring 10 and reserve a larger space for the baffle 12. In this another example, by arranging the groove 102 as a flared groove, the diameter D7 of the circular hole body 101 is reduced while the maximum width D8 of the baffle mounting hole 10a is substantially unchanged, so that the minimum width of the baffle mounting hole 10a is reduced.

[0056] Figure 1 In some embodiments, as shown in The center line of the circular hole body 101 coincides with the axis of the rotor end ring 10. The number of grooves 102 is equal to the number of magnetic poles on the rotor core 3 corresponding to the rotor end ring 10. Wherein, each groove 102 is uniformly spaced in the circumferential direction of the rotor end ring 10.

[0057] In the above example, by arranging the grooves 102 equal to the number of magnetic poles and uniformly spacing each groove 102 in the circumferential direction of the rotor end ring 10, each groove 102 can be correspondingly arranged at the magnetic steel of each magnetic pole when the rotor end ring 10 is installed on the rotor core 3, so that the groove 102 can dissipate heat from the magnetic steel in each magnetic pole, thereby optimizing the heat dissipation performance of the magnetic steel in each magnetic pole and improving the performance of the motor.

[0058] Figure 1As shown, the application also provides a rotor 1 comprising a rotor core 3 and the rotor end ring 10 of any one of the above. Wherein the rotor end ring 10 is arranged at the end of the rotor core 3, and the aforementioned recess 102 is arranged at the magnetic steel in the magnetic pole on the rotor core 3, so as to facilitate the heat dissipation of the recess 102 to the magnetic steel in the magnetic pole, and improve the heat dissipation performance.

[0059] In some embodiments, as shown, Figure 1 When the number of the aforementioned recess 102 is equal to the number of the magnetic poles on the rotor core 3, each recess 102 is arranged at the magnetic steel in the corresponding magnetic pole in a one-to-one correspondence, so as to dissipate heat from the magnetic steel in each magnetic pole, optimize the heat dissipation performance of the magnetic steel in each magnetic pole, and improve the performance of the motor.

[0060] In some embodiments, as shown, Figure 1 As shown, in the projection plane along the axis of the rotor 1, the outer contour of the magnetic steel 5 in the magnetic pole can be entirely located inside the baffle mounting hole 10a; or part of the contour of the outer contour of the magnetic steel 5 in the magnetic pole is located inside the baffle mounting hole 10a, and part of the contour coincides with the hole wall of the baffle mounting hole 10a.

[0061] Wherein, the rotor end ring in the prior art usually covers part of the outer magnetic steel, the rotor end ring has a large area, which is not conducive to the starting and torque output of the motor. In the above example, the application makes each magnetic steel 5 located in the baffle mounting hole 10a of the rotor end ring 10, so that the rotor end ring 10 does not cover each magnetic steel 5, which is conducive to reducing the area of the rotor end ring 10, making the rotor end ring 10 have a suitable filling area, and increasing the resistance of the rotor end ring 10 to improve the starting torque.

[0062] In some embodiments, as shown, Figure 5 As shown, the aforementioned rotor core 3 has two or more magnetic pole forming regions 11 corresponding to the magnetic poles of the rotor. Each magnetic pole forming region 11 is provided with a magnetic barrier groove structure 4. The magnetic barrier groove structure 4 is symmetrical about the d-axis in the magnetic pole forming region 11 and forms a flare structure towards the outer circumferential side of the rotor core 3. The bottom of the magnetic barrier groove structure 4 has a magnetic steel groove 4b located on the d-axis, and the magnetic barrier groove structure 4 further comprises two filling grooves 4a symmetrical about the d-axis and extending laterally. Wherein, each magnetic steel groove 4b is provided with a magnetic steel 5.

[0063] In the above example, by designing the magnetic barrier groove structure 4 in the magnetic pole forming region 11 in a U-shaped structure, the magnetic circuit can be optimized, and the output torque of the motor can be improved.

[0064] In some embodiments, as shown, Figure 5 As shown, in the magnetic pole forming region 11, the number of the aforementioned magnetic barrier groove structure 4 is two or more and is arranged in sequence along the d-axis.

[0065] In the above example, by arranging two or more magnetic barrier groove structures 4 in the magnetic pole forming region 11 and sequentially spacing them along the d-axis, a plurality of layers of magnetic barriers can be formed on the d-axis, thereby increasing the salient pole difference and generating reluctance torque.

[0066] In some embodiments, as shown in Figure 5 The angle between the two filling grooves 4a in the aforementioned magnetic barrier groove structure 4 is α, and in the d-axis direction, the closer the magnetic barrier groove structure 4 is to the outer peripheral side of the rotor core 3, the smaller the corresponding angle α.

[0067] Compared with the prior art in which the angle α corresponding to each magnetic barrier groove structure 4 is designed to be uniform, the present application gradually reduces the angle α corresponding to each magnetic barrier groove structure 4 in the direction outward along the radial direction of the rotor core 3, thereby optimizing the gradient of the reluctance path, smoothing the overall reluctance size, optimizing the air gap magnetic field distribution, and thereby suppressing the higher harmonics of the cogging torque, and further reducing the torque ripple.

[0068] It should be noted that the essence of torque ripple is the time-domain superposition of harmonic torque, and when the harmonics are reduced, the torque ripple is also reduced.

[0069] In a specific application example, as shown in Figure 5 When the magnetic barrier groove structure 4 in each magnetic pole forming region 11 includes a first magnetic barrier groove structure 41, a second magnetic barrier groove structure 42, a third magnetic barrier groove structure 43, and a fourth magnetic barrier groove structure 44 arranged sequentially outward along the radial direction of the rotor core 3, the angle α corresponding to the first magnetic barrier groove structure 41 is defined as α1, and the angle α corresponding to the second magnetic barrier groove structure 42 is defined as α2, the angle α corresponding to the third magnetic barrier groove structure 43 is defined as α3, and the angle α corresponding to the fourth magnetic barrier groove structure 44 is defined as α4. Among them, α4 < α3 < α2 < α1.

[0070] The magnetic barrier groove structure 4 forms a magnetic flux barrier in the radial direction of the rotor, and the first magnetic barrier groove structure 41, the second magnetic barrier groove structure 42, the third magnetic barrier groove structure 43, and the fourth magnetic barrier groove structure 44 cooperate to form four layers of magnetic flux barriers. The magnetic flux barriers form a magnetic flux channel.

[0071] In some embodiments, in the magnetic pole forming region 11, the closer the magnetic barrier groove structure 4 is to the outer peripheral side of the rotor core 3 in the d-axis direction, the smaller the area of the internal filling groove 4a.

[0072] According to the starting torque formula: Tst ∝ R2 / (R2 2 +X2 2X2 represents the rotor leakage reactance. R2 represents the rotor resistance, which is inversely proportional to the area of ​​the filling slot 4a. Appropriately reducing the area of ​​the filling slot 4a will increase the rotor resistance R2. When the rotor resistance R2 increases, the starting torque Tst first increases and then decreases. In the above example, the present invention gradually reduces the area of ​​the filling slot 4a in each magnetic barrier slot structure 4 in the radial outward direction along the rotor core 3, thereby increasing the rotor resistance R2 within a certain range. This ensures that the starting torque Tst also shows an increasing trend within a certain range, thus enhancing the starting torque and ensuring the motor output.

[0073] In some embodiments, the thickness of each of the aforementioned filling grooves 4a is equal. Furthermore, within the magnetic pole forming region 11, in the d-axis direction, the closer the magnetic barrier groove structure 4 is to the outer periphery of the rotor core 3, the smaller the width of its internal filling groove 4a. Thus, the thickness and width of each filling groove 4a are matched to achieve a smaller area of ​​the internal filling groove 4a within the magnetic barrier groove structure 4 in the d-axis direction, within the magnetic pole forming region 11.

[0074] In some implementations, such as Figure 5 As shown, the magnetic barrier slot structure 4 that is closest to the outer wall of the rotor core 3 in the d-axis direction among the magnetic barrier slot structures 4 in the magnetic pole forming region 11 is defined as the first B magnetic barrier slot structure 40.

[0075] In the first example, within the magnetic pole forming region 11, the thickness of the magnets in each magnetic barrier groove structure 4 is equal.

[0076] In the second example, within the magnetic pole forming region 11, the thickness of the magnet in the first B magnetic barrier slot structure 40 is greater than the thickness of the magnets in the other magnetic barrier slot structures 4. Preferably, the thickness of the magnet in the first B magnetic barrier slot structure 40 is at least 1.1 times greater than the thickness of the magnets in the other magnetic barrier slot structures 4.

[0077] In this case, because the outer magnet 5 is closer to the air gap, the air gap magnetic field intensity generated by the stator slots is higher. This causes the magnet 5 to be subjected to a larger demagnetizing magnetic field, exceeding its coercivity and resulting in irreversible demagnetization. In the second example mentioned above, by increasing the thickness of the magnets inside the outermost first B magnetic barrier slot structure 40, the demagnetization resistance of the outermost magnet 5 can be improved, while also enhancing the consistency of demagnetization resistance among all magnets 5. Furthermore, since only the thickness of the magnets inside the outermost first B magnetic barrier slot structure 40 is increased, compared to increasing the thickness of each magnet 5, this method is relatively less expensive.

[0078] It should be noted that in cost-reduction design, the magnet 5 in the first B magnetic barrier groove structure 40 is usually set to the thinnest thickness that will not demagnetize under high temperature conditions.

[0079] In some embodiments, when the thickness of the magnet in the first B magnetic barrier slot structure 40 is greater than the thickness of the magnet in other magnetic barrier slot structures 4 within the magnetic pole forming region 11, wherein there are three or more magnetic barrier slot structures 4 within the magnetic pole forming region 11, and the thickness of the magnet in each magnetic barrier slot structure 4 other than the first B magnetic barrier slot structure 4 is equal, so that the magnets 5 in other magnetic barrier slot structures 4 other than the first B magnetic barrier slot structure 4 can be universally used.

[0080] In some implementations, such as Figure 6 As shown, within the magnetic pole forming region 11, any two adjacent magnetic barrier slot structures 4 are defined as the first A magnetic barrier slot structure 46 and the second A magnetic barrier slot structure 47, respectively. The second A magnetic barrier slot structure 47 is closer to the outer periphery of the rotor core 3 in the d-axis direction relative to the first A magnetic barrier slot structure 46. The width of the magnet in the first A magnetic barrier slot structure 46 is L1, and the width of the magnet in the second A magnetic barrier slot structure 47 is L2, where L1 ≥ L2.

[0081] In the example above, the width of magnet 5 can be determined based on the position and size of magnet slot 4b. It can be set to the same width, but this will be limited by the width of the outer magnet 5. Setting it to different widths is to maximize the permanent magnet torque output and improve the motor's output capacity.

[0082] In a specific application example, such as Figure 5 As shown, when the magnetic barrier slot structure 4 includes a first magnetic barrier slot structure 41, a second magnetic barrier slot structure 42, a third magnetic barrier slot structure 43, and a fourth magnetic barrier slot structure 44 arranged radially outward along the rotor core 3, the thickness of the magnet 5 in the first magnetic barrier slot structure 41 is w1 and the width is l1; the thickness of the magnet 5 in the second magnetic barrier slot structure 42 is w2 and the width is l2; the thickness of the magnet 5 in the third magnetic barrier slot structure 43 is w3 and the width is l3; and the thickness of the magnet 5 in the fourth magnetic barrier slot structure 44 is w4 and the width is l4. Wherein, w1 = w2 = w3 ≤ w4, and l1 ≥ l2 ≥ l3 ≥ l4. Preferably, 1.1 * w1 = 1.1 * w2 = 1.1 * w3 ≤ w4.

[0083] In the example above, permanent magnets are allocated according to the demagnetization characteristics of the motor to ensure the demagnetization resistance of the permanent magnets and improve the consistency of demagnetization resistance.

[0084] In some implementations, such as Figures 6-7As shown, in a cross-section perpendicular to the axis of the rotor core 3, each filling groove 4a has a first sidewall 4a1 and a second sidewall 4a2 in the width direction, and the end of each filling groove 4a opposite to the outer wall of the rotor core 3 is a tapered end 4a3. The bottom of the tapered end 4a3 has a first endpoint 4a5 and a second endpoint 4a6. The tapered end 4a3 is connected to the first sidewall 4a1 through the first endpoint 4a5 and to the second sidewall 4a2 through the second endpoint 4a6. The top 4a4 of each tapered end 4a3 is located on a circle with diameter D1, and each first endpoint 4a5 and each second endpoint 4a6 is located on a circle with diameter D2. The outer diameter of the rotor core 3 is D, where D2 < D1 < D. Preferably, 1.2 * D2 < 1.05 * D1 < D. More preferably, 1.05 * D2 < 1.02 * D1 < D.

[0085] In the above example, by adjusting the positions of the top 4a4 and bottom endpoints of the filling groove 4a, and controlling the taper angle of the filling groove 4a, the air gap magnetic field distribution can be optimized, and torque pulsation can be reduced. Specifically, the present invention optimizes the position of the filling groove 4a by adjusting D1 and D2, which can optimize the cogging and harmonic torque. In essence, this is similar to adjusting the angle of the filling groove 4a, both aiming to make the magnetic reluctance path of the magnetic field lines as smooth as possible when passing through different positions, thereby suppressing the high-order harmonics of the cogging torque and reducing torque pulsation.

[0086] It should be noted that if D1 and D2 shrink excessively inward, the gap between the edge of the filling groove 4a and the outer circle of the rotor will increase, leading to increased leakage flux, increased torque pulsation, and changes in the amplitude of different harmonics within the rotor. This invention, by designing the dimensions of D1 and D2, can make the magnetic reluctance path of the magnetic lines of force as smooth as possible when passing through different positions, thereby suppressing high-order harmonics of the cogging torque and reducing torque pulsation.

[0087] In some implementations, such as Figure 5 As shown, the rotor core 3 has a q-axis filling groove 45 located on the q-axis between two adjacent magnetic pole forming regions 11. The q-axis filling groove 45 can be rectangular. Within a cross-section perpendicular to the axis of the rotor core 3, the maximum distance between the q-axis filling groove 45 and the center of the rotor core 3 is D3, the minimum distance between the q-axis filling groove 45 and the center of the rotor core 3 is D4, and the outer diameter of the rotor core 3 is D, where 0.15*D ≤ D3-D4 ≤ 0.2*D.

[0088] In the above example, the present invention adds a q-axis filling groove 45 to the q-axis and designs the radial dimension of the q-axis filling groove 45 such that 0.15*D ≤ D3-D4 ≤ 0.2*D. The q-axis filling groove 45 cooperates with the aforementioned filling groove 4a, and the area of ​​the filling groove 4a can be adjusted. The area of ​​the filling groove 4a determines the rotor resistance. A suitable filling groove 4a area can increase the rotor resistance, thereby increasing the starting torque. For details, please refer to the starting torque formula above.

[0089] By properly setting the positions of filling slot 4a and q-axis filling slot 45, the impact on the magnetic circuit can be reduced, the starting torque of the motor can be increased, and the starting capability of the motor can be improved.

[0090] It should be noted that, considering the position of the fixing hole 9, such as the rivet hole, in the actual sample making, stress concentration problems caused by the small distance between the q-axis filling groove 45 and its fixing hole 9 should be avoided as much as possible. At the same time, the performance and process problems caused by excessive cast aluminum in the q-axis filling groove 45 should be reduced. When the simulation is carried out within the variable range of the q-axis filling groove 45 mentioned above in this invention, the effect is better.

[0091] In some implementations, such as Figure 5 As shown, a first magnetic bridge 81 is formed between the aforementioned magnetic steel groove 4b and the two adjacent filling grooves 4a within the magnetic barrier groove structure. The width of the first magnetic bridge 81 is w10, 0. w10 ≤ 2σ, where σ is the air gap width between the rotor and the stator of the corresponding motor. Alternatively, the magnet slot 4b is connected to both filling slots 4a adjacent to the magnetic barrier slot structure 4.

[0092] According to the formula: Hd∝1 / Rm, Rm∝magnetic path length / (permeability × cross-sectional area), the demagnetizing magnetic field Hd is inversely proportional to the magnetic reluctance Rm. When the rib width is too small, the magnetic reluctance is small, the demagnetizing magnetic field is strong, and the permanent magnet is prone to demagnetization. When the rib width is large, the magnetic flux path is too long, causing the average magnetic flux to decrease. According to the formula T∝ΦI, this leads to a decrease in output torque. Within a suitable rib width range, leakage flux can be minimized, while avoiding the generation of a strong demagnetizing magnetic field due to low magnetic reluctance, which can cause irreversible demagnetization of the permanent magnet. In addition, due to the large current generated during startup, the rotor side temperature is high. If the rib width is small, the temperature rise is significant, and the high temperature makes the permanent magnet more prone to irreversible demagnetization. In summary, within a certain rib width range, the demagnetization resistance of the permanent magnet can be improved. In the example above, by ensuring that 0 ≤ w10 ≤ 2σ, the rib width of the first magnetic bridge 81 can be guaranteed. This reduces leakage flux and improves the demagnetization resistance of the permanent magnet under high current during normal operation.

[0093] In some implementations, such as Figure 5As shown, a second magnetic bridge 82 is formed between each of the aforementioned filling grooves 4a and the outer wall of the rotor core 3. The width of the second magnetic bridge 82 is w11, 0. w11≤ 2σ, where σ is the air gap width between the rotor and the stator of the corresponding motor; or, each filling slot 4a penetrates the outer wall of the rotor core 3.

[0094] In the example above, by ensuring 0 ≤ w11 ≤ 2σ, the rib width of the second magnetic bridge 82 can be guaranteed. This reduces leakage flux and improves the demagnetization resistance of the permanent magnet under high current during normal operation.

[0095] In a specific application example, w10 = w11.

[0096] In some implementations, such as Figure 5 As shown, within the magnetic pole forming region 11, there are three or more magnetic barrier slot structures 4. The distance between the magnetic steel slots 4b in two adjacent magnetic barrier slot structures 4 is k. Two adjacent magnetic barrier slot structures 4 are defined as a magnetic barrier slot group. In the d-axis direction, the closer the magnetic barrier slot group is to the outer periphery of the rotor core 3, the smaller its corresponding k is. In a specific application example, the magnetic barrier slot structure 4 in each magnetic pole forming region 11 includes a first magnetic barrier slot structure 41, a second magnetic barrier slot structure 42, a third magnetic barrier slot structure 43, and a fourth magnetic barrier slot structure 44 arranged radially outward along the rotor core 3. The distance between the magnetic steel slots 4b in the first magnetic barrier slot structure 41 and the second magnetic barrier slot structure 42 is k1, the distance between the magnetic steel slots 4b in the second magnetic barrier slot structure 42 and the third magnetic barrier slot structure 43 is k2, and the distance between the magnetic steel slots 4b in the third magnetic barrier slot structure 43 and the fourth magnetic barrier structure 44 is k3, where k1 > 1.1 * k2 > 1.3 * k3.

[0097] Specifically, by gradually decreasing the distance k between the magnetic slots in adjacent magnetic barrier slot structures 4 in the radial outward direction along the rotor core 3, the d-axis magnetic reluctance passing through the rotor core gradually increases, while the d-axis inductance Ld gradually decreases, and the q-axis inductance Lq remains relatively unchanged. This results in an increase in the saliency difference (ΔL = Lq - Lq), which, according to the electromagnetic torque calculation formula: T e = 1.5p [ ψ f *i q +(L d -L q )i d i qAs can be seen, an increase in saliency leads to an increase in reluctance torque. Furthermore, when the width of the magnetic channel is small, the magnetic field generated by the magnets 5 (e.g., permanent magnets) within the magnet slot 4b becomes saturated, limiting the output capability. Therefore, a reasonable magnetic channel width can increase the saliency, improve reluctance torque, and simultaneously avoid local saturation, thereby increasing permanent magnet torque and enhancing overall output capability. In the example above, this invention gradually decreases the distance k between the magnet slots in adjacent magnetic barrier slot structures 4 in the radial outward direction along the rotor core 3, for example, making k1 > 1.1*k2 > 1.3*k3. This setting increases the saliency of the formed magnetic barrier layer, generating reluctance torque; simultaneously, it avoids overloading of the magnetic channel between permanent magnets, reduces rotor saturation, maximizes permanent magnet torque and reluctance torque, and increases the motor's output capability.

[0098] In some implementations, such as Figure 5 As shown, the aforementioned rotor core 3 is also provided with fixing holes 9, such as rivet holes. These fixing holes 9 are used for the passage of baffle fasteners, such as rivets. In a cross-section perpendicular to the axis of the rotor core 3, the distance between the center of the fixing hole 9 and the center of the rotor core 3 is D5, and the inner diameter of the rotor core 3 is D6, where 1.15*D6 ≤ D5 ≤1.2*D6.

[0099] In the above example, by making 1.15*D6 ≤ D5 ≤ 1.2*D6, the purpose is twofold: first, to avoid the fixing hole 9 being too close to the rotating shaft, which could lead to stress concentration and deformation or breakage during high-speed operation; and second, to facilitate the actual machining process of the fixing hole 9.

[0100] In some embodiments, the aforementioned rotor core may be formed by stacking two or more rotor cores 3 sequentially along the axial direction.

[0101] In some embodiments, each of the aforementioned magnets 5 can be a permanent magnet or the like, and the magnets 5 can be rectangular.

[0102] In some implementations, such as Figure 5 As shown, each of the aforementioned filling slots 4a is filled with guide strips 13, such as... Figure 1 As shown, both ends of the aforementioned rotor core 3 are provided with rotor end rings 10, and each rotor end ring 10 is opposite to and electrically connected to the end of each guide bar 13 at its respective end.

[0103] It should be noted that the aforementioned guide bars 13 can be aluminum or copper. The guide bars 13 in each filling slot 4a cooperate to form a squirrel cage. Aluminum bars can be formed in the filling slot 4a using a cast aluminum method. If the guide bars 13 are cast aluminum, the rotor end ring 10 and the rotor core 3 are formed by casting with molten aluminum, eliminating the need for subsequent assembly. If the guide bars 13 are copper, the rotor end ring 10 and the rotor core 3 can be connected by laser welding. The function of the aforementioned rotor end ring 10 is to form a closed loop, generate electromagnetic torque, and improve the motor's starting capability. When the rotor rotates in the stator's rotating magnetic field, the guide bars 13 cut magnetic lines of force, generating an induced electromotive force. The rotor end ring 10 short-circuits both ends of all the guide bars 13, allowing the induced current to flow in the closed loop formed by the guide bars 13 and the rotor end ring 10, thereby generating rotor current. Under the action of the stator's magnetic field, the rotor current experiences a force, forming an electromagnetic torque that drives the rotor to rotate.

[0104] In some implementations, such as Figure 1 As shown, when the aforementioned magnetic barrier groove structure 4 includes a first magnetic barrier groove structure 41, a second magnetic barrier groove structure 42, a third magnetic barrier groove structure 43, and a fourth magnetic barrier groove structure 44 arranged sequentially outward along the radial direction of the rotor core 3, in the projection plane along the axial direction of the rotor, the outline of the aforementioned circular hole 101 is located on a circle with a diameter of D7, the magnet 5 in the aforementioned second magnetic barrier groove structure 42 is located inside the circle, and the magnet 5 in the aforementioned third magnetic barrier groove structure 43 is located outside the circle; and the bottom surface of the aforementioned groove 102 is located between the outer circle of the rotor and the magnet 5 in the fourth magnetic barrier groove structure 44.

[0105] In some embodiments, the aforementioned baffle 12 can be fixed by baffle fasteners, such as rivets, passing through the aforementioned fixing hole 9 to prevent the magnet 5 from sliding out axially. The baffle 12 is made of a non-magnetic material, such as stainless steel. The overall size of the baffle 12 is smaller than the inner diameter of the rotor end ring 10, and the inner diameter of the baffle 12 is larger than the outer diameter of the rotor shaft hole. The purpose of this arrangement is to fix the magnet 5 and prevent the magnet 5 from vibrating, sliding, or falling out.

[0106] In some embodiments, the aforementioned rotor 1 may be a self-starting permanent magnet assisted synchronous reluctance motor rotor.

[0107] In some embodiments, the present invention also provides an electric motor that may include the rotor end ring 10 of any of the above; or include the rotor 1 of any of the above.

[0108] In some implementations, the aforementioned motor may be a self-starting permanent magnet assisted synchronous reluctance motor.

[0109] Figure 9 The diagram illustrates the change in magnetic flux density of the outer magnets of both the motor of this invention and a prior art motor over time. Figure 9The motor of the present invention satisfies: 0.6*D ≤ D7 ≤ 0.7*D, 0.92*D ≤ D8 ≤ 0.95*D; and within the magnetic pole forming region 11, in the d-axis direction, the area of ​​the internal filling slot 4a of the magnetic barrier slot structure 4 closer to the outer periphery of the rotor core 3 is smaller; and within the magnetic pole forming region 11, the number of the aforementioned magnetic barrier slot structures 4 is three or more, the distance between the magnetic steel slots 4b in two adjacent magnetic barrier slot structures 4 is k, and two adjacent magnetic barrier slot structures 4 are defined as a magnetic barrier slot group, and in the d-axis direction, the closer the magnetic barrier slot group is to the outer periphery of the rotor core 3, the smaller its corresponding k is. Figure 9 It can be seen that, compared with the prior art, the technical solution of the present invention can enhance the magnetic flux density of the outer magnet during the starting process, thereby enhancing the starting torque and improving the starting capability of the motor.

[0110] Figure 10 A graph showing the relationship between harmonic values ​​and harmonic orders of the motor of this invention and a prior art motor is presented. The motor of this invention satisfies the following: in the d-axis direction, the closer the magnetic barrier slot structure 4 is to the outer periphery of the rotor core 3, the smaller the included angle α; and 1.2*D2 < 1.05*D1 < D, 0.15*D ≤ D3 - D4 ≤ 0.2*D. Figure 10 As can be seen, compared with the prior art, the technical solution of the present invention can suppress the high-order harmonics of the cogging torque, thereby reducing torque pulsation.

[0111] The present invention can enhance the starting torque and improve the starting capability of the motor by designing the rotor end ring 10; improve the air gap magnetic field distribution and reduce torque pulsation by designing the filling groove 4a; and improve the anti-demagnetization capability of the permanent magnet and enhance the stability of motor operation by designing the magnet 5 and the magnetic bridge width.

[0112] This invention improves the motor's starting capability by adjusting the internal structure of the rotor end ring 10, rationally setting the filling area of ​​the rotor end ring 10, increasing the resistance of the rotor end ring 10, enhancing the starting torque, and simultaneously ensuring the magnetic field distribution of the permanent magnet, thereby improving the motor's output capability. Furthermore, by rationally allocating the widths of the magnet slots 4b and the filling slots 4a, sufficient area of ​​the filling slots 4a is ensured to provide starting torque; adjusting the opening angle of the filling slots 4a and controlling the sharpening angle of the filling slots 4a improves the air gap magnetic field distribution and reduces torque pulsation; inserting magnets 5, such as permanent magnets, into the magnet slots 4b, and allocating the permanent magnets according to the motor's demagnetization characteristics, ensures the anti-demagnetization capability of the magnets 5 and improves the consistency of anti-demagnetization; and limiting the thickness of the magnets 5 and the magnetic channel ensures sufficient rotor space and reduces rotor saturation.

[0113] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0114] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A rotor end ring (10) characterized by: The baffle mounting hole (10a) includes a circular hole body (101) and a groove (102) arranged on the inner wall of the circular hole body (101).

2. The rotor end ring (10) according to claim 1, characterized in that: The diameter of the circular hole body (101) is D7; in a cross section perpendicular to the center line of the circular hole body (101), the maximum distance from the bottom of the groove (102) to the center of the circular hole body (101) is D8 / 2; wherein the outer diameter of the rotor core (3) corresponding to the rotor end ring (10) is D, 0.6*D ≤ D7 ≤ 0.7*D, and 0.92*D ≤ D8 ≤ 0.95*D.

3. The rotor end ring (10) according to claim 1, characterized in that: The two groove walls of the groove (102) are parallel; or the two groove walls of the groove (102) are relatively flared to form a flared groove.

4. The rotor end ring (10) according to any one of claims 1-3, characterized in that: The center line of the circular hole body (101) coincides with the axis of the rotor end ring (10), and the number of grooves (102) is equal to the number of magnetic poles on the rotor core (3) corresponding to the rotor end ring (10); wherein each groove (102) is uniformly spaced in the circumferential direction of the rotor end ring (10).

5. A rotor characterized by: The rotor core (3) and the rotor end ring (10) according to any one of claims 1-4; the rotor end ring (10) is arranged at the end of the rotor core (3), and the groove (102) is arranged at the magnetic steel in the magnetic pole of the rotor core (3).

6. The rotor of claim 5, wherein: When the number of grooves (102) is equal to the number of magnetic poles on the rotor core (3), each groove (102) is arranged at the magnetic steel in the corresponding magnetic pole.

7. The rotor according to claim 6, characterized in that: In the projection plane along the rotor axis, the outer contour of the magnetic steel (5) in the magnetic pole is entirely located inside the baffle mounting hole (10a); or part of the contour of the magnetic steel (5) in the magnetic pole is located inside the baffle mounting hole (10a), and part of the contour coincides with the hole wall of the baffle mounting hole (10a).

8. The rotor according to any one of claims 5-7, characterized in that: The rotor core (3) has two or more magnetic pole forming regions (11) corresponding to the rotor magnetic poles, and each magnetic pole forming region (11) is provided with a magnetic barrier groove structure (4); the magnetic barrier groove structure (4) is symmetrical about the d-axis in the magnetic pole forming region (11) and forms a flare structure towards the outer circumferential side of the rotor core (3); the bottom of the magnetic barrier groove structure (4) has a magnetic steel groove (4b) located on the d-axis, and the magnetic barrier groove structure (4) further includes two filling grooves (4a) symmetrical about the d-axis and extending laterally; wherein each magnetic steel groove (4b) is provided with a magnetic steel (5).

9. The rotor of claim 8, wherein: In the magnetic pole formation region (11), the number of the magnetic barrier groove structures (4) is two or more and arranged in sequence along the d-axis.

10. The rotor according to claim 9, wherein: The included angle between the two filled grooves (4a) in the magnetic barrier groove structure (4) is a, and in the d-axis direction, the closer to the outer peripheral side of the rotor core (3), the smaller the corresponding included angle a. And / or, in the magnetic pole formation region (11), in the d-axis direction, the closer to the outer peripheral side of the rotor core (3), the smaller the area of the inner filled groove (4a) of the magnetic barrier groove structure (4).

11. The rotor of claim 9, wherein: The magnetic barrier groove structure (4) closest to the outer wall of the rotor core (3) in the d-axis direction in each magnetic barrier groove structure (4) in the magnetic pole formation region (11) is defined as the first B magnetic barrier groove structure (40). In the magnetic pole formation region (11), the thickness of the magnetic steel in the first B magnetic barrier groove structure (40) is greater than that in other magnetic barrier groove structures (4), or the thickness of the magnetic steel in each magnetic barrier groove structure (4) is equal.

12. The rotor of claim 11, wherein: When the thickness of the magnetic steel in the first B magnetic barrier groove structure (40) is greater than that in other magnetic barrier groove structures (4) in the magnetic pole formation region (11), wherein, In the magnetic pole formation region (11), the number of the magnetic barrier groove structures (4) is three or more, and the thickness of the magnetic steel in each magnetic barrier groove structure (4) other than the first B magnetic barrier groove structure (40) is equal. And / or, the thickness of the magnetic steel in the first B magnetic barrier groove structure (40) is at least 1.1 times greater than that in other magnetic barrier groove structures (4).

13. The rotor according to any one of claims 9-12, wherein: In the magnetic pole formation region (11), any two adjacent magnetic barrier groove structures (4) are defined as a first A magnetic barrier groove structure (46) and a second A magnetic barrier groove structure (47), respectively, and the second A magnetic barrier groove structure (47) is closer to the outer peripheral side of the rotor core (3) than the first A magnetic barrier groove structure (46) in the d-axis direction; wherein the width of the magnetic steel in the first A magnetic barrier groove structure (46) is L1, and the width of the magnetic steel in the second A magnetic barrier groove structure (47) is L2, L1≥L2.

14. The rotor according to claim 8, wherein: In a cross section perpendicular to the axis of the rotor core (3), each of the filling grooves (4a) has opposite first and second side walls (4a1, 4a2) in the width direction, and each of the filling grooves (4a) has a width-tapered end (4a3) opposite to the outer wall of the rotor core (3), the bottom of the width-tapered end (4a3) has opposite first and second end points (4a5, 4a6), the width-tapered end (4a3) is connected to the first side wall (4a1) through the first end point (4a5), and is connected to the second side wall (4a2) through the second end point (4a6); wherein the top (4a4) of each of the width-tapered ends (4a3) is located on a circle with a diameter D1, and each of the first end points (4a5) and each of the second end points (4a6) are located on a circle with a diameter D2, the outer diameter of the rotor core (3) is D, 1.2*D2<1.05*D1<D.

15. The rotor of claim 8, wherein: The rotor core (3) is provided with a q-axis filling groove (45) on the q-axis between two adjacent magnetic pole forming regions (11); wherein in a cross section perpendicular to the axis of the rotor core (3), the maximum distance between the q-axis filling groove (45) and the center of the rotor core (3) is D3, the minimum distance between the q-axis filling groove (45) and the center of the rotor core (3) is D4, and the outer diameter of the rotor core (3) is D, 0.15*D≤D3-D4≤0.2*D.

16. The rotor of claim 8, wherein: The magnetic steel slot (4b) and the two adjacent filling slots (4a) in the magnetic barrier slot structure (4) form a first magnetic bridge (81), the width of the first magnetic bridge (81) is w10, 0 w10≤ 2σ, σ is the air gap width between the rotor (1) and the stator of the corresponding motor; or, the magnetic steel slot (4b) and the two adjacent filling slots (4a) in the magnetic barrier slot structure (4) are all through.

17. The rotor of claim 8, wherein: Each of the filling slots (4a) forms a second magnetic bridge (82) with the outer wall of the rotor core (3), the width of the second magnetic bridge (82) being w11,0 w11≤ 2σ, σ being the air gap width between the rotor (1) and the stator of the corresponding electric machine; or, each of the filling slots (4a) penetrates the outer wall of the rotor core (3).

18. The rotor of claim 8, wherein: In the magnetic pole forming region (11), the number of magnetic barrier groove structures (4) is three or more, the distance between the magnetic steel grooves (4b) in adjacent two magnetic barrier groove structures (4) is k, adjacent two magnetic barrier groove structures (4) are defined as a magnetic barrier groove group, and in the d-axis direction, the closer to the outer peripheral side of the rotor core (3), the smaller the corresponding k.

19. The rotor of claim 18, wherein: Each of the magnetic barrier groove structures (4) in each of the magnetic pole forming regions (11) includes a first magnetic barrier groove structure (41), a second magnetic barrier groove structure (42), a third magnetic barrier groove structure (43), and a fourth magnetic barrier groove structure (44) arranged in sequence outward in the radial direction of the rotor core (3), wherein the distance between the magnetic steel grooves (4b) in the first magnetic barrier groove structure (41) and the second magnetic barrier groove structure (42) is k1, the distance between the magnetic steel grooves (4b) in the second magnetic barrier groove structure (42) and the third magnetic barrier groove structure (43) is k2, and the distance between the magnetic steel grooves (4b) in the third magnetic barrier groove structure (43) and the fourth magnetic barrier groove structure (44) is k3, k1>1.1*k2>1.3*k3.

20. The rotor of claim 8, wherein: The rotor core (3) is further provided with a fixing hole (9) for a baffle fastener to pass through; in a cross section perpendicular to the axis of the rotor core (3), the distance between the center of the fixing hole (9) and the center of the rotor core (3) is D5, and the inner diameter of the rotor core (3) is D6, 1.15*D6 ≤ D5 ≤ 1.2*D6.

21. An electric machine characterized by: A rotor comprising the rotor end ring (10) of any one of claims 1-4; or a rotor comprising the rotor of any one of claims 5-20.

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