Rotor punching sheet, rotor iron core, rotor and motor

Abstract

The invention provides a rotor punching sheet, a rotor core, a rotor and a motor, the rotor punching sheet is provided with more than two magnetic pole forming areas corresponding to rotor magnetic poles, and each magnetic pole forming area is provided with a magnetic barrier groove structure; the magnetic barrier groove structure is symmetrical about a d axis in a magnetic pole forming area where the magnetic barrier groove structure is located, an opening angle structure facing the peripheral side of the rotor punching sheet is formed, a first magnetic steel groove located on the d axis is formed in the bottom of the magnetic barrier groove structure, and the magnetic barrier groove structure further comprises two lateral extending grooves symmetrical about the d axis. The lateral extension groove comprises an air groove, a second magnetic steel groove and a first filling groove which are sequentially arranged at intervals in the direction away from the first magnetic steel groove, magnetic bridges are formed at the intervals, and a magnetic bridge is also formed between the air groove and the first magnetic steel groove. According to the invention, the air gap flux density harmonic wave of the motor can be weakened so as to reduce the cogging torque and radial electromagnetic force of the motor.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a rotor lamination, a rotor core, a rotor, and a motor. Background Technology

[0002] The self-starting permanent magnet assisted synchronous reluctance motor, based on the permanent magnet assisted synchronous reluctance motor, combines the advantages of asynchronous motors. It utilizes the asynchronous torque generated by the rotor's squirrel cage bars to achieve self-starting, and since there are no rotor copper losses, it has high efficiency. In existing technology, the rotor has a magnetic barrier slot structure in each magnetic pole forming region. The magnetic barrier slot structure is symmetrical about the d-axis within its respective magnetic pole forming region and forms an angular structure facing the outer periphery of the rotor. The magnetic barrier slot structure includes a magnetic steel slot at the bottom and two laterally symmetrical filling slots about the d-axis. Magnets, such as permanent magnets, are installed in the magnetic steel slots, and conductor bars are embedded in each filling slot to enable the motor to achieve self-starting. However, the motor made with this rotor has relatively large air gap magnetic flux density harmonics, resulting in relatively large cogging torque and radial electromagnetic force, thus requiring a solution to this problem. Summary of the Invention

[0003] Therefore, the present invention provides a rotor lamination, a rotor core, a rotor, and a motor. The main technical problem to be solved is: how to weaken the air gap magnetic flux density harmonics of the motor in order to reduce the cogging torque and radial electromagnetic force of the motor.

[0004] To address the aforementioned problems, this invention provides a rotor lamination having two or more magnetic pole forming regions corresponding to rotor magnetic poles, each magnetic pole forming region having a magnetic barrier groove structure; the magnetic barrier groove structure is symmetrical about the d-axis within its magnetic pole forming region and forms an angle structure facing the outer periphery of the rotor lamination; the bottom of the magnetic barrier groove structure has a first magnetic steel groove located on the d-axis; the magnetic barrier groove structure further includes two lateral extension grooves symmetrical about the d-axis; the lateral extension grooves include, along a direction away from the first magnetic steel groove, an air groove, a second magnetic steel groove, and a first filling groove that are sequentially spaced apart and form magnetic bridges at each interval, and a magnetic bridge is also formed between the air groove and the first magnetic steel groove.

[0005] In some embodiments, the number of magnetic barrier slot structures in each magnetic pole forming region is two or more, and they are arranged sequentially at intervals along the d-axis; and a magnetic conductive channel is formed between each pair of adjacent magnetic barrier slot structures in the magnetic pole forming region.

[0006] In some embodiments, for any magnetic bridge, its two side walls in the width direction are parallel; and the air slots in each magnetic barrier slot structure are all arc-shaped slots, the inner arc surface of the arc-shaped slot corresponds to the inner side of the magnetic barrier slot structure, and the outer arc surface of the arc-shaped slot corresponds to the outer side of the magnetic barrier slot structure; the central angles of each air slot are equal.

[0007] In some embodiments, the magnetic barrier slot structure includes a first magnetic barrier slot structure, a second magnetic barrier slot structure, and a third magnetic barrier slot structure arranged sequentially in a radially outward direction along the rotor lamination. The distance between the first magnetic steel slots in each pair of adjacent magnetic barrier slot structures is equal and is h. The region on the rotor lamination between the d-axis and the q-axis is defined as a first region. In the first region, the distance between the second magnetic steel slots inside the first magnetic barrier slot structure and the second magnetic barrier slot structure is h3, and the distance between the second magnetic steel slots inside the second magnetic barrier slot structure and the third magnetic barrier slot structure is h4. Wherein, h3 > 1.22h, and h4 > h.

[0008] In some embodiments, the width of each magnetic bridge is equal and is w, where 0.5mm ≤ w ≤ 1.5mm.

[0009] In some embodiments, each magnetic pole forming region is provided with a d-axis filling groove structure located on the d-axis, and the d-axis filling groove structure is closer to the outer periphery of the rotor lamination in the d-axis direction than the magnetic barrier groove structure in the magnetic pole forming region.

[0010] In some embodiments, within a cross-section perpendicular to the axis of the rotor lamination, the minimum distance between the d-axis filling groove structure and the center of the rotor lamination is D1 / 2; wherein,

[0011] The outer diameter of the rotor lamination is D, and 0.9*D ≤ D1 ≤ D;

[0012] And / or, in a cross section perpendicular to the axis of the rotor lamination, the minimum distance between the first filling groove and the center of the rotor lamination is D2 / 2, where D1 > D2.

[0013] In some embodiments, each of the d-axis filling groove structures and each of the first filling grooves forms an outer peripheral magnetic bridge with the outer wall of the rotor lamination. The width of the outer peripheral magnetic bridge is w4, where 0 < w4 ≤ 2σ, and σ is the air gap width between the stator inner diameter and the rotor outer diameter of the motor corresponding to the rotor lamination.

[0014] Alternatively, each of the d-axis filling groove structures and each of the first filling grooves penetrates the outer wall of the rotor lamination.

[0015] The present invention also provides a rotor core, which may include the rotor laminations described in any one of the above-mentioned embodiments.

[0016] The present invention also provides a rotor comprising the rotor laminations described in any one of the above-described embodiments; or comprising the rotor core described above.

[0017] In some embodiments, when the number of magnetic barrier slot structures in each magnetic pole forming region is two or more, and they are arranged sequentially at intervals along the d-axis; and when a magnetic conductive channel is formed between each pair of adjacent magnetic barrier slot structures in the magnetic pole forming region, a first magnet is installed in each first magnet slot, and a second magnet is installed in each second magnet slot; the thickness of the first magnet is equal to the thickness of the second magnet; the width of the first magnet is L, the width of the second magnet in the first magnetic barrier slot structure is a1, the width of the second magnet in the second magnetic barrier slot structure is a2, and the width of the second magnet in the third magnetic barrier slot structure is a3; wherein, a1=a2>a3, and L>1.5*a1, L>2.3*a3.

[0018] The present invention also provides an electric motor comprising the rotor laminations described in any one of the above descriptions; or comprising the rotor core described in the above descriptions; or comprising the rotor described in the above descriptions.

[0019] The rotor lamination, rotor core, rotor, and motor provided by this invention have the following beneficial effects:

[0020] Compared to existing technologies, this invention, by adding an inclined second magnet slot and an air slot located between the second and first magnet slots, along with the first magnet slot and the filling slot, and by installing magnets such as permanent magnets in each of the first and second magnet slots, can optimize the magnetic circuit, optimize the sinusoidal magnetic flux density, and weaken the harmonics of the air gap magnetic flux density. This can effectively reduce the cogging torque and radial electromagnetic force of the motor, thereby achieving the purpose of vibration reduction and noise reduction. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic diagram of a rotor structure provided in one embodiment of the present invention;

[0023] Figure 2 It reflects Figure 1 A schematic diagram of the dimensions of the upper part of the rotor;

[0024] Figure 3 A comparison diagram is shown between the air gap magnetic flux density of the motor of the present invention and a conventional motor of the prior art at different harmonic orders.

[0025] Figure 4 The diagram shows the cogging torque over time for both the motor of the present invention and a conventional motor of the prior art.

[0026] Figure 5 A comparison diagram of the radial electromagnetic forces of the motor of the present invention and a conventional motor of the prior art at different spatial orders is shown.

[0027] The attached figures are labeled as follows: 1. Rotor lamination; 2. Magnetic channel; 3. First region; 4. D-axis filling groove structure; 6. Magnetic barrier groove structure; 6a. First magnet groove; 6b. Lateral extension groove; 7. Screw hole; 8. First magnet; 9. Second magnet; 10. Magnetic bridge; 11. Magnetic pole forming region; 41. First D-axis filling groove; 42. Second D-axis filling groove; 61. Air groove; 62. Second magnet groove; 63. First filling groove; 601. First magnetic barrier groove structure; 602. Second magnetic barrier groove structure; 603. Third magnetic barrier groove structure. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0030] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0032] See also Figure 1 As shown, according to an embodiment of the present invention, a rotor lamination 1 is provided, having two or more magnetic pole forming regions 11 corresponding to rotor magnetic poles, each magnetic pole forming region 11 having a magnetic barrier groove structure 6. The magnetic barrier groove structure 6 is symmetrical about the d-axis within its magnetic pole forming region 11 and forms an angular structure facing the outer periphery of the rotor lamination 1. The bottom of the magnetic barrier groove structure 6 has a first magnetic steel groove 6a located on the d-axis, and the magnetic barrier groove structure 6 also includes two laterally extending grooves 6b symmetrical about the d-axis. The laterally extending grooves 6b include, along a direction away from the first magnetic steel groove 6a, an air groove 61, a second magnetic steel groove 62, and a first filling groove 63, which are sequentially spaced apart and form magnetic bridges 10 at each interval, and a magnetic bridge 10 is also formed between the air groove 61 and the first magnetic steel groove 6a. Specifically, there is a gap between the air groove 61 and the second magnetic steel groove 62, and a magnetic bridge 10 is formed between them at the gap. There is also a gap between the second magnetic steel groove 62 and the first filling groove 63, and a magnetic bridge 10 is also formed between them at the gap.

[0033] Compared to existing technologies, this invention adds an inclined second magnet slot 62 and an air slot 61 located between the second magnet slot 62 and the first magnet slot 6a. Combined with the first magnet slot 6a and the filling slot 4, when magnets such as permanent magnets are installed in both the first magnet slot 6a and the second magnet slot 62, it can optimize the magnetic circuit, optimize the sinusoidal nature of the magnetic flux density, and weaken the harmonics of the air gap magnetic flux density. This can effectively reduce the cogging torque and radial electromagnetic force of the motor, thereby achieving the purpose of vibration reduction and noise reduction.

[0034] Figure 3 A comparison diagram is shown of the air gap magnetic flux density of the motor of the present invention and a conventional motor of the prior art at different harmonic orders. Figure 4 The diagram shows the cogging torque over time for both the motor of the present invention and a conventional motor of the prior art. Figure 5 A comparison diagram of the radial electromagnetic forces of the motor of this invention and a conventional motor of the prior art at different spatial orders is shown. Figures 3-5 The motors described in this invention all use the aforementioned rotor laminations. From Figure 3 It can be seen that, compared with the prior art, the air gap magnetic flux density of the motor of the present invention is lower at different harmonic orders. Furthermore, from... Figure 4 It can be seen that, compared with the prior art, the cogging torque of the motor of the present invention is significantly reduced. And from... Figure 5 It can be seen from this Figure 5 As can be seen, compared with the prior art, the radial electromagnetic force wave of the motor of the present invention is smaller at different spatial orders, including the 40th order radial electromagnetic force (kZ±p) generated by the first order tooth harmonic, which is reduced by 68.3%, achieving the effect of vibration reduction and noise reduction, extending the motor life and improving the comfort of the operating environment.

[0035] It should be noted that cogging torque is generated by the interaction of the 5th and 7th harmonics in the air gap magnetic flux density with the fundamental wave. Attenuating the air gap magnetic flux density harmonics can effectively reduce cogging torque. Furthermore, the spatial order of the radial electromagnetic force wave directly affects motor vibration; therefore, weakening the radial electromagnetic force means reducing the interaction of various harmonics. The solution of this invention, by weakening the air gap magnetic flux density harmonics, can directly and significantly reduce the amplitude of each order of harmonics, thereby reducing the interaction of these harmonics and weakening the radial electromagnetic force. In other words, this invention can simultaneously reduce cogging torque and radial electromagnetic force by weakening the air gap magnetic flux density harmonics.

[0036] It's important to note that in an electric motor, the stator has Z teeth, and the rotor has p pairs of magnetic poles (i.e., the number of pole pairs is p). When the rotor rotates, the stator teeth and rotor poles periodically align and misalign, resulting in a periodically changing permeability in the air gap. This periodic change triggers a series of harmonic magnetomotive forces, called tooth harmonics. "kZ ± p" represents the spatial order of the tooth harmonics, the number of pole pairs in the tooth harmonic magnetic field generated by the interaction of the stator tooth number Z and the rotor pole pair number p. It determines the intensity of cogging torque, vibration noise, and torque pulsation.

[0037] In this invention, by designing the arrangement of the magnet slots and the air slot 61, the rotor space can be fully utilized, the utilization rate of magnets such as permanent magnets can be improved, the cogging torque and radial electromagnetic force can be reduced, and vibration and noise reduction can be achieved.

[0038] In some embodiments, the maximum width of the first magnetic groove 6a, the second magnetic groove 62, the first filling groove 63 and the air groove 61 mentioned above are all equal and all w7, so that the overall structure of the magnetic barrier groove structure 6 can be more regular and beautiful.

[0039] In some implementations, such as Figure 1 As shown, the number of magnetic barrier slot structures 6 in each of the aforementioned magnetic pole forming regions 11 is two or more, and they are arranged alternately along the d-axis. Furthermore, a magnetically conductive channel 2 is formed between each pair of adjacent magnetic barrier slot structures 6 in the magnetic pole forming region 11.

[0040] In the above example, the aforementioned magnetic barrier slot structure 6 forms a magnetic barrier layer. By designing a larger number of magnetic barrier slot structures 6 to form a multi-layered magnetic flux barrier, the saliency difference can be increased, resulting in a larger reluctance torque. Specifically, the multi-layered magnetic flux barrier increases the saliency difference by increasing the complexity of the magnetic circuit, i.e., increasing the difference between the quadrature-axis inductance and the direct-axis inductance, thereby enhancing the reluctance torque. The multi-layered magnetic flux barrier alters the magnetic circuit design of the motor rotor. In permanent magnet synchronous motors, the generation of reluctance torque depends on the asymmetry of the motor's quadrature-axis and direct-axis magnetic circuit structures, which is determined by the saliency ratio (the difference between the quadrature-axis inductance and the direct-axis inductance). The design of the multi-layered magnetic barrier increases the complexity of the reluctance path, making the magnetic flux more inclined to flow along a specific direction (such as the q-axis), thereby increasing the saliency ratio.

[0041] In some implementations, such as Figure 1 As shown, for any magnetic bridge 10, its two side walls in the width direction are parallel. Furthermore, the air slots 61 within each magnetic barrier structure 6 are arc-shaped slots, with the inner arc surface corresponding to the inner side of the magnetic barrier structure 6 and the outer arc surface corresponding to the outer side of the magnetic barrier structure 6. The central angles of each air slot 61 are equal and are all α. In a specific application example, α = 7.5°.

[0042] In the example above, since the two side walls of the magnetic bridge 10 are parallel in the width direction and the central angles of each air slot 61 are equal, the rotor space can be fully utilized to increase the permanent magnet torque and reluctance torque, thereby improving the torque output capability.

[0043] In some implementations, such as Figure 1-2As shown, the aforementioned magnetic barrier slot structure 6 includes a first magnetic barrier slot structure 601, a second magnetic barrier slot structure 602, and a third magnetic barrier slot structure 603 arranged sequentially in a radially outward direction along the rotor lamination 1. The distance between the first magnetic steel slots 6a in each pair of adjacent magnetic barrier slot structures 6 is equal and is h. The region on the rotor lamination 1 between the d-axis and the q-axis is defined as the first region 3. Within the first region 3, the distance between the second magnetic steel slots 62 inside the first magnetic barrier slot structure 601 and the second magnetic barrier slot structure 602 is h3, and the distance between the second magnetic steel slots 62 inside the second magnetic barrier slot structure 602 and the third magnetic barrier structure 603 is h4. Wherein, h3 > 1.22h, and h4 > h.

[0044] In the example above, by setting h3 > 1.22h and h4 > h, the thickness between the magnet slots is ensured to prevent overloading of the magnetic channel between the slots, thus avoiding rotor saturation and maximizing permanent magnet torque and reluctance torque, thereby increasing the motor's output performance. If the thickness between the magnet slots is reduced, the magnetic flux chain flowing out of this channel will be compressed, leading to an increase in local magnetic flux density and rotor saturation.

[0045] In some implementations, such as Figure 1-2 As shown, the widths of all the aforementioned magnetic bridges 10 are equal and all are w, with 0.5mm ≤ w ≤ 1.5mm. The purpose of this design is to improve the demagnetization resistance of the permanent magnets in the magnetic steel slot under high current, while ensuring normal operation and minimal magnetic leakage within a certain magnetic bridge width range. Specifically, by introducing a high magnetic reluctance barrier, the reverse magnetic field is forced to deflect, significantly reducing the demagnetization field intensity acting on the permanent magnets and stabilizing their operating point within a safe region, thereby significantly improving demagnetization resistance under high current.

[0046] In some implementations, such as Figure 1 As shown, each of the aforementioned magnetic pole forming regions 11 is provided with a d-axis filling groove structure 4 located on the d-axis, and the d-axis filling groove structure 4 is close to the outer periphery of the rotor lamination 1 in the d-axis direction relative to the magnetic barrier groove structure 6 in the magnetic pole forming region 11.

[0047] In the example above, by setting the d-axis filling groove structure 4 on the d-axis, the saliency difference can be further increased, resulting in a larger reluctance torque.

[0048] In some embodiments, the aforementioned d-axis filling groove structure 4 may include a first d-axis filling groove 41 located on the d-axis and a second d-axis filling groove 42 located on both sides of the d-axis.

[0049] In some embodiments, the widths of the first d-axis filling groove 41 and the second d-axis filling groove 42 can be equal, and both are w6. The maximum width of each of the aforementioned first filling grooves 63 is equal and is w5. The first d-axis filling groove 41, the second d-axis filling groove 42, and the first filling groove 63 are all used to fill the guide strip to facilitate the self-starting of the motor.

[0050] In some embodiments, the minimum distance between the aforementioned d-axis filling groove structure 4 and the center of the rotor lamination 1 in a cross-section perpendicular to the axis of the rotor lamination 1 is D1 / 2. The outer diameter of the rotor lamination 1 is D, and 0.9*D ≤ D1 ≤ D.

[0051] In the example above, by setting 0.9*D ≤ D1 ≤ D, the purpose of this setting is to ensure that there is enough rotor space in the d-axis direction to reasonably arrange the multi-layer permanent magnets and magnetic channels, thereby reducing the impact of rotor magnetic circuit saturation.

[0052] In some implementations, such as Figure 2 As shown, in a cross section perpendicular to the axis of rotor lamination 1, the minimum distance between the first filling groove 63 and the center of rotor lamination 1 is D2 / 2, where D1 > D2.

[0053] In the above example, by making D1 > D2, the width of the d-axis filling groove structure 4 is reasonably set to ensure that a certain rotor space can be arranged for multiple layers of permanent magnets and magnetic channels, thus avoiding magnetic circuit saturation.

[0054] In some implementations, such as Figure 1-2 As shown, each of the aforementioned d-axis filling groove structures 4 and each of the first filling grooves 63 forms an outer peripheral magnetic bridge with the outer wall of the rotor lamination 1. The width of the outer peripheral magnetic bridge is w4, where 0 < w4 ≤ 2σ, and σ is the air gap width between the stator inner diameter and the rotor outer diameter of the motor corresponding to the rotor lamination 1. Alternatively, each of the d-axis filling groove structures 4 and each of the first filling grooves 63 penetrates the outer wall of the rotor lamination 1.

[0055] In the example above, by setting 0 ≤ w4 ≤ 2σ, the purpose is to ensure the mechanical strength of the rotor structure. Simultaneously, a smaller magnetic bridge width or no magnetic bridge reduces motor leakage flux, improving the motor's output capacity. Leakage flux refers to magnetic flux not completely passing through the predetermined main magnetic path (e.g., air gap → rotor → air gap → stator). Reducing the magnetic bridge width decreases the amount of ferromagnetic material and increases magnetic reluctance, forcing more magnetic flux to pass through the air gap and enter the main magnetic path of the rotor or stator, thereby reducing internal leakage flux. Reducing leakage flux allows more magnetic flux to pass through the air gap, increasing the air gap magnetic flux density and improving electromagnetic torque.

[0056] In some implementations, such as Figure 1-2As shown, the d-axis in the aforementioned magnetic pole forming region 11 is perpendicular to the length direction of the first magnetic groove 6a, so as to facilitate the formation of a magnetic barrier in the d-axis direction.

[0057] The region between the d-axis and q-axis on the rotor lamination 1 is defined as the first region 3. The first filling groove 63 within the first region 3 is parallel to the q-axis. This arrangement aims to reduce the influence of the first filling groove 63 on the magnetic circuit by utilizing its extension direction, thus ensuring motor output. The first filling groove 63 and the d-axis filling groove 41 work together to achieve self-starting of the motor.

[0058] It's important to clarify here that the d-axis (direct axis) of the motor is defined as the axis coinciding with the direction of the rotor's magnetic field, while the q-axis (quadrature axis) is defined as the axis leading the d-axis by 90° electrical angle. These two axes form an orthogonal coordinate system that rotates synchronously with the rotor. The d-axis runs along the rotor's magnetic pole centerline (N pole to S pole) and is used to control the magnetic field strength (e.g., the excitation component). The q-axis is perpendicular to the d-axis (leading by 90° electrical angle) and is used to generate electromagnetic torque (related to the torque component). This definition is based on the principle of field orientation, using Clarke-Park transformation to convert three-phase AC quantities into DC quantities along the d and q axes, achieving decoupled control of the motor's magnetic field and torque. The electrical angle between the d-axis and q-axis is always 90°, while the physical angle varies depending on the number of pole pairs. For a 2-pole (4-pole) motor, the physical angle between the q-axis and d-axis is 45°. According to the principle of motor structure, the electrical angle between the d-axis (direct axis) and the q-axis (quadrature axis) is fixed at 90 degrees, while the physical angle is calculated by the formula "90° / number of pole pairs P".

[0059] In some embodiments, the rotor lamination 1 is further provided with two or more screw holes 7 arranged sequentially along the circumference.

[0060] In some implementations, such as Figure 1-2 As shown, the aforementioned second magnetic groove 62 is inclined relative to the first magnetic groove 6a. In some cases, the first magnetic groove 6a may be referred to as a horizontal magnetic groove, while the second magnetic groove 62 may be referred to as an inclined magnetic groove.

[0061] In some implementations, such as Figure 1-2 As shown, the included angle between the two second magnetic grooves 62 symmetrical about the d-axis within the aforementioned magnetic barrier groove structure 6 is β, 0°≤β≤90°, and the included angle between the d-axis within the magnetic pole forming region 11 and the center line of the thickness direction of the second magnetic groove 62 is δ, 45°≤δ≤90°. In a specific application example, β=90°, δ=45°.

[0062] In this invention, the design of the widths of the d-axis filling groove structure 4 and the first filling groove 63, the design of the central angle of the air groove 61, and the design of the multi-layer magnetic barrier groove structure 6 to increase the saliency difference are all aimed at optimizing the magnetic circuit, changing the dq-axis inductance, and improving torque output capability. Specifically,

[0063] After coordinate transformation, the mathematical model of SynRM in the given coordinate system is obtained:

[0064]

[0065] Where ud and uq are the stator d-axis and q-axis voltages, id and iq are the stator d-axis and q-axis currents, and Ld and Lq are the stator winding d-axis and q-axis inductances. Rst is the rotor electric angular velocity, p is the differential operator, and Rst is the stator winding phase resistance.

[0066]

[0067] in, These are the stator d-axis and q-axis magnetic flux linkages, respectively.

[0068]

[0069] As can be seen from the above formula, the torque part of SynRM consists only of reluctance torque. When the magnitude of the three-phase combined current vector is and the included angle α remain unchanged, the magnitude of the electromagnetic torque Te is determined by the difference in inductance between the d and q axes (Ld-Lq).

[0070] Therefore, it can be seen that by increasing the difference in inductance between the d and q axes (Ld-Lq), the electromagnetic torque can be increased, thereby improving the torque output capability.

[0071] This invention optimizes the magnetic field and reduces harmonic amplitude by limiting the arrangement of the magnet slots and the position of the air slots 61. This improves output capability while reducing cogging torque and radial electromagnetic force, thus achieving vibration reduction and noise reduction. Ensuring sufficient rotor space along the d-axis and rationally arranging the multi-layer magnetic barrier slot structure 6 and the magnetic guiding channels between the magnetic barrier slot structures 6 can prevent rotor magnetic circuit saturation, increase the permanent magnet torque and reluctance torque of the motor, and improve motor efficiency.

[0072] In some embodiments, the present invention also provides a rotor core, which may include the rotor laminations 1 of any of the above. The rotor core may be formed by stacking two or more rotor laminations 1 axially.

[0073] In some implementations, such as Figure 1-2 As shown, the present invention also provides a rotor, which may include the rotor lamination 1 of any of the above; or include the rotor core of the above.

[0074] In some implementations, the rotor described above can be a self-starting permanent magnet assisted synchronous reluctance motor rotor.

[0075] In some implementations, such as Figure 2 As shown, when the number of magnetic barrier slot structures 6 in each magnetic pole forming region 11 is two or more, and they are arranged alternately along the d-axis; and when a magnetic conductive channel 2 is formed between each pair of adjacent magnetic barrier slot structures 6 in the magnetic pole forming region 11, a first magnet 8 is installed in each first magnet slot 6a, and a second magnet 9 is installed in each second magnet slot 62. The thickness of the first magnet 8 is equal to the thickness of the second magnet 9. The width of the first magnet 8 is L, the width of the second magnet 9 in the first magnetic barrier slot structure 601 is a1, the width of the second magnet 9 in the second magnetic barrier slot structure 602 is a2, and the width of the second magnet 9 in the third magnetic barrier slot structure 603 is a3. Wherein, a1=a2>a3, and L>1.5*a1, L>2.3*a3. Preferably,

[0076] In this invention, under the same materials and conditions, increasing the thickness of the magnet, such as a permanent magnet, can significantly improve its demagnetization resistance. Increased magnetomotive force and internal magnetic reluctance lead to a decrease in magnetic flux under the same demagnetization conditions, thereby enhancing demagnetization resistance. In the example above, this invention ensures that the magnet does not demagnetize by setting a1=a2>a3, and L>1.5*a1, L>2.3*a3, and adjusting the magnet thickness according to demagnetization characteristics. This improves the magnet's demagnetization resistance, ensures sufficient magnet thickness in each layer, avoids localized protection, and enhances the consistency of demagnetization resistance. Furthermore, controlling the amount of magnet used ensures that the cost is comparable to existing technologies.

[0077] In some embodiments, both the first magnet 8 and the second magnet 9 described above can be permanent magnets or the like. The thickness of both the first magnet 8 and the second magnet 9 is equal.

[0078] It should be noted here that: (as...) Figure 1 As shown, the aforementioned first magnet groove 6a forms first air grooves on both sides of the width direction of the first magnet 8. Similarly, the aforementioned second magnet groove 62 forms second air grooves on both sides of the width direction of the second magnet 9.

[0079] In some embodiments, the present invention also provides an electric motor comprising a rotor lamination 1 as described above; or a rotor core as described above; or a rotor as described above.

[0080] In some implementations, the aforementioned motor may be a self-starting permanent magnet assisted synchronous reluctance motor.

[0081] This invention, through the arrangement of magnets within the magnet slots and the structural design of the air slot 61, can significantly reduce cogging torque, extend equipment life, and improve the comfort of the operating environment. Simultaneously, the rotor structure of this invention can also significantly weaken the radial electromagnetic force of the main spatial order, achieving vibration reduction and noise reduction. Both the aforementioned first filling slot 63 and the d-axis filling slot structure 4 can be filled with guide bars to form a squirrel cage structure. The asynchronous torque provided by these guide bars enables the motor to start automatically, reducing motor losses and improving motor efficiency.

[0082] 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.

[0083] 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 lamination (1), characterized in that: The device has two or more magnetic pole forming regions (11) corresponding to the rotor magnetic poles. Each magnetic pole forming region (11) is provided with a magnetic barrier groove structure (6). The magnetic barrier groove structure (6) is symmetrical about the d-axis within the magnetic pole forming region (11) and forms an angle structure facing the outer periphery of the rotor lamination (1). The bottom of the magnetic barrier groove structure (6) has a first magnetic steel groove (6a) located on the d-axis. The magnetic barrier groove structure (6) also includes two lateral extension grooves (6b) symmetrical about the d-axis. The lateral extension grooves (6b) include an air groove (61), a second magnetic steel groove (62), and a first filling groove (63) arranged sequentially at intervals and forming a magnetic bridge (10) at each interval. A magnetic bridge (10) is also formed between the air groove (61) and the first magnetic steel groove (6a).

2. The rotor lamination (1) according to claim 1, characterized in that: The number of magnetic barrier groove structures (6) in each magnetic pole forming region (11) is more than two, and they are arranged sequentially at intervals along the d-axis; and a magnetic channel (2) is formed between each pair of adjacent magnetic barrier groove structures (6) in the magnetic pole forming region (11).

3. The rotor lamination (1) according to claim 2, characterized in that: For any magnetic bridge (10), its two side walls in the width direction are parallel; and the air slots (61) in each magnetic barrier slot structure (6) are all arc-shaped slots, the inner arc surface of the arc-shaped slot corresponds to the inner side of the magnetic barrier slot structure (6), and the outer arc surface of the arc-shaped slot corresponds to the outer side of the magnetic barrier slot structure (6); the central angles of each air slot (61) are equal.

4. The rotor lamination (1) according to claim 2 or 3, characterized in that: The magnetic barrier slot structure (6) includes a first magnetic barrier slot structure (601), a second magnetic barrier slot structure (602), and a third magnetic barrier slot structure (603) arranged sequentially in the radial outward direction along the rotor lamination (1). The distance between the first magnetic steel slots (6a) in each pair of adjacent magnetic barrier slot structures (6) is equal and is h. The region on the rotor lamination (1) between the d-axis and the q-axis is defined as the first region (3). In the first region (3), the distance between the second magnetic steel slots (62) inside the first magnetic barrier slot structure (601) and the second magnetic barrier slot structure (602) is h3, and the distance between the second magnetic steel slots (62) inside the second magnetic barrier slot structure (602) and the third magnetic barrier slot structure (603) is h4. Wherein, h3 > 1.22h, h4 > h.

5. The rotor lamination (1) according to any one of claims 1-3, characterized in that: The width of each of the magnetic bridges (10) is equal and w, 0.5mm≤w≤1.5mm.

6. The rotor lamination (1) according to claims 1-3, characterized in that: Each magnetic pole forming region (11) is provided with a d-axis filling groove structure (4) located on the d-axis, and the d-axis filling groove structure (4) is close to the outer periphery of the rotor lamination (1) in the d-axis direction relative to the magnetic barrier groove structure (6) in the magnetic pole forming region (11).

7. The rotor lamination (1) according to claim 6, characterized in that: Within a cross-section perpendicular to the axis of the rotor lamination (1), the minimum distance between the d-axis filling groove structure (4) and the center of the rotor lamination (1) is D1 / 2; wherein, The outer diameter of the rotor lamination (1) is D, and 0.9*D ≤ D1 ≤ D; And / or, in a section perpendicular to the axis of the rotor lamination (1), the minimum distance between the first filling groove (63) and the center of the rotor lamination (1) is D2 / 2, where D1 > D2.

8. The rotor lamination (1) according to claim 6, characterized in that: Each of the d-axis filling groove structures (4) and each of the first filling grooves (63) form an outer peripheral magnetic bridge with the outer wall of the rotor lamination (1). The width of the outer peripheral magnetic bridge is w4, where 0 < w4 ≤ 2σ, and σ is the air gap width between the stator inner diameter and the rotor outer diameter of the motor corresponding to the rotor lamination (1). Alternatively, each of the d-axis filling groove structures (4) and each of the first filling grooves (63) can penetrate the outer wall of the rotor lamination (1).

9. A rotor core, characterized in that: Includes the rotor lamination (1) according to any one of claims 1-8.

10. A rotor, characterized in that: It includes the rotor lamination (1) as described in any one of claims 1-8; or it includes the rotor core as described in claim 9.

11. The rotor according to claim 10, characterized in that: When the number of magnetic barrier slot structures (6) in each of the magnetic pole forming regions (11) is two or more, and they are arranged sequentially at intervals along the d-axis; and a magnetic conductive channel (2) is formed between each pair of adjacent magnetic barrier slot structures (6) in the magnetic pole forming region (11); and the magnetic barrier slot structure (6) includes a first magnetic barrier slot structure (601), a second magnetic barrier slot structure (602), and a third magnetic barrier slot structure (603) arranged sequentially in the radial outward direction along the rotor lamination (1), a first magnet (8) is installed in each of the first magnet slots (6a), and Each of the second magnet slots (62) is equipped with a second magnet (9); the thickness of the first magnet (8) is equal to the thickness of the second magnet (9); the width of the first magnet (8) is L, the width of the second magnet (9) in the first magnetic barrier slot structure (601) is a1, the width of the second magnet (9) in the second magnetic barrier slot structure (602) is a2, and the width of the second magnet (9) in the third magnetic barrier slot structure (603) is a3; wherein, a1=a2>a3, and L>1.5*a1, L>2.3*a3.

12. An electric motor, characterized in that: It includes the rotor lamination (1) of any one of claims 1-8; or the rotor core of claim 9; or the rotor of claim 10 or 11.

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