Rotor punching sheet, rotor iron core, rotor, motor and air conditioner

Abstract

The invention provides a rotor punching sheet, a rotor core, a rotor, a motor and an air conditioner, the rotor punching sheet is provided with magnetic pole forming areas, each magnetic pole forming area is internally provided with a magnetic steel groove structure, and each magnetic steel groove structure is provided with two first magnetic steel grooves which are symmetrical about the d axis in the corresponding magnetic pole forming area and are relatively opened; an opening formed by the two first magnetic steel grooves faces the periphery of the rotor punching sheet; first magnetic barrier grooves are formed in the outer sides, in the length direction, of the two first magnetic steel grooves in the magnetic pole forming area, and a first magnetic bridge is formed between each first magnetic barrier groove and the corresponding first magnetic steel groove; the rotor punching sheet is also provided with a second magnetic barrier groove located on the q axis. The second magnetic barrier grooves and the two adjacent first magnetic barrier grooves on the two sides of the q axis are oppositely arranged at intervals, and second magnetic bridges are formed at the intervals. A third magnetic bridge is further formed between every two adjacent first magnetic barrier grooves in the two sides of the q-axis. According to the invention, loss can be reduced and motor efficiency can be improved.

Description

Technical Field

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

[0002] Permanent magnet motors, with their advantages of small size, high efficiency, and low rare-earth content, are widely used in the air conditioning industry. With the increasing energy efficiency standards for air conditioners, higher requirements are being placed on motor efficiency. Correspondingly, the efficiency of permanent magnet motors, one of their core components, needs further improvement. Currently, one technical approach to improving motor efficiency is to increase the amount of permanent magnets used to obtain a larger air gap magnetic flux and a greater magnetic gap. However, due to the fixed rotor magnetic circuit structure, efficiency improvement is limited. Another approach is to set multiple layers of magnetic barriers in the rotor structure to increase the motor's salient pole ratio, thereby increasing the motor's reluctance torque to compensate for the insufficient torque of the permanent magnets. However, excessive magnetic barriers not only reduce the motor's mechanical strength but also limit further improvements in motor efficiency. Therefore, how to improve motor efficiency has become a technical problem that those skilled in the art need to solve. Summary of the Invention

[0003] Therefore, the present invention provides a rotor lamination, a rotor core, a rotor, a motor, and an air conditioner. The main technical problem to be solved is: how to improve the efficiency of the motor.

[0004] To address the aforementioned problems, the present invention provides a rotor lamination having two or more magnetic pole forming regions corresponding to rotor magnetic poles. Each magnetic pole forming region is provided with a magnetic steel slot structure. The magnetic steel slot structure has two first magnetic steel slots that are symmetrical about the d-axis of their respective magnetic pole forming region and are relatively open, and the opening formed by the two first magnetic steel slots faces the outer periphery of the rotor lamination. Furthermore, each magnetic pole forming region has a first magnetic barrier slot on the outer side of the two first magnetic steel slots along its length direction, and each first magnetic barrier slot forms a first magnetic bridge with its corresponding first magnetic steel slot. The rotor lamination is also provided with a second magnetic barrier groove on the q-axis; the second magnetic barrier groove and the two first magnetic barrier grooves adjacent to each other on both sides of the q-axis are arranged at intervals and a second magnetic bridge is formed at each interval, and each second magnetic bridge is located on the side of the corresponding first magnetic barrier groove away from the first magnetic bridge; wherein, a third magnetic bridge is also formed between the two adjacent first magnetic barrier grooves on both sides of the q-axis.

[0005] In some embodiments, each of the magnetic pole forming regions is provided with a d-axis magnetic barrier groove located on the d-axis.

[0006] In some embodiments, the width of the first magnetic bridge is w3, and the width of the third magnetic bridge is w4; w3 ≤ w4.

[0007] In some embodiments, the magnet slot structure is a slanted structure symmetrically arranged about the d-axis within the magnetic pole forming region, wherein the two first magnet slots within the magnet slot structure are both lateral extensions of the slanted structure; the magnet slot structure also includes two second magnet slots located at the bottom, the two second magnet slots being located on both sides of the d-axis within the magnetic pole forming region, and a fourth magnetic bridge being formed between the two second magnet slots.

[0008] In some embodiments, when each of the magnetic pole forming regions is provided with a d-axis magnetic barrier slot located on the d-axis, the magnetic steel slot structure is closer to the radial inner side of the rotor lamination relative to the d-axis magnetic barrier slot in the magnetic pole forming region; wherein, the width of the d-axis magnetic barrier slot between the two sides of the d-axis is w2, and the width of the fourth magnetic bridge is w1, wherein w2≥w1.

[0009] In some embodiments, when each of the magnetic pole forming regions is provided with a d-axis magnetic barrier groove located on the d-axis, the distance between the d-axis magnetic barrier groove and the second magnetic steel groove in the magnetic pole forming region in the d-axis direction is h1, and the distance between the d-axis magnetic barrier groove and the outer circle of the rotor lamination in the d-axis direction is h2, wherein h2≤h1.

[0010] In some embodiments, when each of the magnetic pole forming regions is provided with a d-axis magnetic barrier groove located on the d-axis, the distance between the d-axis magnetic barrier groove and the second magnetic steel groove in the magnetic pole forming region in the d-axis direction is h1, the distance between the d-axis magnetic barrier groove and the outer circle of the rotor lamination in the d-axis direction is h2, and the distance between the second magnetic barrier groove and the outer circle of the rotor lamination in the q-axis direction is h3; wherein, h3≤h2

[0011] In some embodiments, the width of the third magnetic bridge is w4; the width of the fourth magnetic bridge is w1, where w4 ≤ w1.

[0012] In some embodiments, the first and second magnetic slots located on the same side of the d-axis within each of the magnetic pole forming regions are connected by a first air slot.

[0013] In some embodiments, the second magnetic barrier groove is an elliptical magnetic barrier groove, wherein the major axis length of the elliptical magnetic barrier groove is n1 and the minor axis length is n2, and n1≥2.75*n2; And / or, the first magnetic barrier groove is an arc-shaped groove, and the arc-shaped groove is opposite to one end of the corresponding first magnet groove along its length direction via a convex surface.

[0014] ​In some embodiments, the magnet slot structure is a slanted structure symmetrically arranged about the d-axis within the magnetic pole forming region, wherein the two first magnet slots within the magnet slot structure are both lateral extensions of the slanted structure, and the bottoms of the two first magnet slots within the magnet slot structure are connected through a second air slot.

[0015] The present invention also provides a rotor core comprising 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 magnet slot structure is a slanted structure symmetrically arranged about the d-axis within the magnetic pole forming region, wherein the two first magnet slots within the magnet slot structure are lateral extensions of the slanted structure; and the magnet slot structure further includes two second magnet slots located at the bottom, the two second magnet slots being located on either side of the d-axis within the magnetic pole forming region, and forming a fourth magnetic bridge between the two second magnet slots, each first magnet slot contains a first magnet, and each second magnet slot contains a second magnet, each first magnet and each second magnet are magnetized along their respective thickness direction, and the length of the first magnet is L1, the length of the second magnet is L2, and L1 ≥ L2.

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

[0019] The present invention also provides an air conditioner, which includes the rotor laminations described in any one of the above; or includes the rotor core described in the above; or includes the rotor described in the above; or includes the motor described in the above.

[0020] The rotor lamination, rotor core, rotor, motor, and air conditioner provided by this invention have the following beneficial effects: 1. This invention uses the magnetic bridge between the first magnetic barrier slot, the second magnetic barrier slot, and the first magnet slot as a leakage magnetic bridge. Under low-speed, heavy-load conditions, the magnetic bridge saturates, and no magnetic flux passes through it. Most of the magnetic flux formed by the magnets, such as permanent magnets, enters the air gap and forms effective magnetic flux with the stator magnetic circuit, improving the motor's torque output capability and reducing copper losses. Under high-speed, light-load conditions, the magnetic bridge forms a closed circuit, and magnetic flux passes through it. Due to the low magnetic resistance of the magnetic bridge, the iron losses of the motor are reduced. Thus, this invention can reduce copper losses under low-speed, heavy-load conditions and reduce iron losses under high-speed, light-load conditions, thereby achieving a reasonable adjustment of the motor's loss distribution under different loads, improving motor efficiency, and ultimately enhancing the energy efficiency and operational stability of the air conditioner.

[0021] 2. This invention provides permanent magnet flux to the rotor by using a first magnet and a second magnet installed inside the rotor core, thereby enhancing the motor's magnetizing ability and improving its torque output and torque density. Both the first magnet and the second magnet can be permanent magnets, etc.

[0022] 3. The present invention also optimizes the path of magnetic lines of force by using magnetic bridges between each magnetic steel slot, magnetic bridges between the first magnetic barrier slots, and magnetic bridges between the magnetic steel slots and the first magnetic barrier slots, which also helps to improve the mechanical strength of the motor rotor. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the structure of a rotor lamination provided in the first example of the present invention; Figure 2 It reflects Figure 1 A schematic diagram showing the dimensions of the rotor laminations; Figure 3 This is a schematic diagram of the structure of a rotor lamination provided in the second example of the present invention; Figure 4 A comparison diagram of the losses of the motor of the present invention and conventional motors of the prior art is shown; Figure 5 A comparison graph showing the efficiency of the motor of the present invention and a conventional motor of the prior art under different torques is shown. Figure 6 A comparison diagram of the output torque of the motor of the present invention and a conventional motor of the prior art at different rotor positions is shown.

[0025] The reference numerals in the attached figures are as follows: 1. Rotor lamination; 1a. Magnetic pole forming region; 2. Magnet slot structure; 3. Second magnetic barrier slot; 5. d-axis magnetic barrier slot; 6. First air slot; 8. Fifth magnetic bridge; 9. Second magnetic bridge; 10. First magnetic bridge; 11. Fourth magnetic bridge; 13. Shaft hole; 14. Second air slot; 15. Third magnetic bridge; 16. First magnet; 17. Second magnet; 21. First magnet slot; 22. Second magnet slot; 41. First magnetic barrier slot; 411. Convex surface. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] See also Figure 1-2As shown, according to an embodiment of the present invention, a rotor lamination 1 is provided, which has two or more magnetic pole forming regions 1a corresponding to rotor magnetic poles. Each magnetic pole forming region 1a is provided with a magnetic steel slot structure 2. The magnetic steel slot structure 2 has two first magnetic steel slots 21 that are symmetrical about the d-axis within the magnetic pole forming region 1a and are relatively open, and the opening formed by the two first magnetic steel slots 21 faces the outer periphery of the rotor lamination 1. Among them, a first magnetic barrier slot 41 is provided on the outer side 211 of the two first magnetic steel slots 2 along the length direction within the magnetic pole forming region 1a, and a first magnetic bridge 10 is formed between each first magnetic barrier slot 41 and the corresponding first magnetic steel slot 2.

[0031] The aforementioned rotor lamination 1 is also provided with a second magnetic barrier groove 3 located on the q-axis. The second magnetic barrier groove 3 and the two adjacent first magnetic barrier grooves 41 on both sides of the q-axis are all spaced apart, and a second magnetic bridge 9 is formed at each interval, and each second magnetic bridge 9 is located on the side of the corresponding first magnetic barrier groove 41 away from the first magnetic bridge 10. Among them, a third magnetic bridge 15 is also formed between the two adjacent first magnetic barrier grooves 41 on both sides of the q-axis.

[0032] In the above example, the first magnetic bridge 10, the second magnetic bridge 9, and the third magnetic bridge 15 between the first magnetic barrier slot 41, the second magnetic barrier slot 3, and the first magnetic steel slot 21 can all serve as leakage magnetic bridges. Under low-speed, heavy-load conditions, the magnetic bridges are saturated, and no magnetic flux passes through them. The magnetic flux formed by most of the magnets, such as permanent magnets, enters the air gap and forms effective magnetic flux with the stator magnetic circuit, improving the motor's torque output capability and reducing copper losses. Under high-speed, light-load conditions, the magnetic bridges form a closed circuit, and the magnetic flux passes through them. Due to the low magnetic resistance of the magnetic bridges, the iron losses of the motor are reduced. In summary, the present invention, through the above structural design, can reduce copper losses under low-speed, heavy-load conditions and reduce iron losses under high-speed, light-load conditions. This achieves a reasonable adjustment of the motor's loss distribution under different loads, improves the motor's efficiency, and thus improves the energy consumption level and operational stability of the air conditioner.

[0033] Based on the above-described technical solution of the present invention Figure 4 A comparison diagram of the losses of the motor of the present invention and conventional motors of the prior art is shown. From Figure 4 As can be seen from the present invention, the motor can reduce copper loss and iron core loss under both low-speed heavy load conditions and high-speed light load conditions. The reduction in copper loss is greater under low-speed heavy load conditions, and the reduction in iron loss is greater under high-speed light load conditions.

[0034] Based on the above-described technical solution of the present invention Figure 5 A comparison graph showing the efficiency of the motor of the present invention and a conventional motor of the prior art under different torques is provided. Figure 5 As can be seen from the paper, the efficiency of the motor of the present invention is significantly improved when it operates at different torques.

[0035] In summary Figure 4 and Figure 5 As can be seen, the present invention can reduce copper and iron losses under low-speed heavy-load conditions and high-speed light-load conditions through the above structural design. This achieves reasonable adjustment of the loss distribution of the motor under different loads and improves the efficiency of the motor.

[0036] In some implementations, such as Figure 1 As shown, each of the aforementioned magnetic pole forming regions 1a is provided with a d-axis magnetic barrier groove 5 located on the d-axis.

[0037] In the example above, by setting the d-axis magnetic barrier groove 5 on the d-axis, the path of the magnetic lines of force into the air gap can be guided, the sinusoidal nature of the air gap magnetic flux density can be improved, thereby reducing the harmonic losses and torque pulsation of the motor and improving the quality of torque output.

[0038] In some implementations, such as Figure 1-2 As shown, the width of the first magnetic bridge 10 is w3, and the width of the third magnetic bridge 15 is w4; w3 ≤ w4. Preferably, w3 ≤ 0.5 * w4.

[0039] In the example above, by making w3≤w4, or even w3≤0.5*w4, leakage of magnetism in the magnet inside the first magnet slot 21 can be avoided.

[0040] In the first example, such as Figure 1 As shown, the aforementioned magnet groove structure 2 is a slanted structure symmetrically arranged about the d-axis within the magnetic pole forming region 1a. The two first magnet grooves 21 within the magnet groove structure 2 are both lateral extensions of the slanted structure. The magnet groove structure 2 also includes two second magnet grooves 22 located at the bottom. The two second magnet grooves 22 are located on either side of the d-axis within the magnetic pole forming region 1a, and a fourth magnetic bridge 11 is formed between the two second magnet grooves 22.

[0041] In the first example above, by designing the magnet slot structure 2 into a U-shaped form, the path of magnetic lines of force entering the air gap can be optimized, improving the sinusoidal nature of the air gap magnetic flux density. This reduces harmonic losses and torque ripple in the motor, improving torque output quality. Furthermore, the magnets inside the first magnet slot 21 and the second magnet slot 22 work together to provide permanent magnet flux to the rotor, enhancing the motor's magnetic focusing ability and thus improving its torque output capability and torque density. Additionally, the fourth magnetic bridge 11 provides an extra flux path, helping to increase the motor's d-axis inductance, thereby increasing the motor's reluctance torque and further improving torque density, thus enhancing the motor's torque output capability.

[0042] Based on the technical solution of the first example above. Figure 6 A comparison diagram of the output torque of the motor of the present invention and a conventional motor of the prior art at different rotor positions is shown. Figure 6 As can be seen from the data, the output torque of the motor of the present invention is significantly improved at different rotor positions.

[0043] In some implementations, such as Figure 1-2 As shown, when each of the aforementioned magnetic pole forming regions 1a is provided with a d-axis magnetic barrier groove 5 located on the d-axis, the magnetic steel groove structure 2 is closer to the radial inner side of the rotor lamination 1 relative to the d-axis magnetic barrier groove 5 in its respective magnetic pole forming region 1a; wherein, the width of the d-axis magnetic barrier groove 5 between the two sides of its respective d-axis is w2, and the width of the fourth magnetic bridge 11 is w1, wherein w2≥w1. Preferably, w2≥1.15*w1.

[0044] In the above example, by making w2≥w1, or even w2≥1.15*w1, the size of the convergence point of the fourth magnetic bridge 11, the d-axis magnetic barrier groove 5 and the magnetic steel groove structure 2 can be reduced, the magnetic flux passing through can be reduced, and the magnetic lines of force can be prevented from forming a leakage magnetic path around the d-axis magnetic barrier groove 5 through the fourth magnetic bridge 11. This is beneficial for guiding the magnetic lines of force into the air gap and improving the sinusoidal nature of the air gap magnetic flux density.

[0045] In some implementations, such as Figure 1-2 As shown, when each of the aforementioned magnetic pole forming regions 1a is provided with a d-axis magnetic barrier groove 5 located on the d-axis, the distance between the d-axis magnetic barrier groove 5 and the second magnetic steel groove 22 in the magnetic pole forming region 1a is h1 in the d-axis direction, and the distance between the d-axis magnetic barrier groove 5 and the outer circle of the rotor lamination 1 in the d-axis direction is h2, wherein h2≤h1. Preferably, h2≤0.75*h1.

[0046] In the above example, by making h2≤h1, or even h2≤0.75*h1, the distance between the d-axis magnetic barrier slot 5 and the outer edge of the rotor lamination 1 can be reduced. This allows the magnetic flux generated by the magnets inside the first magnetic slot 21 and the second magnetic slot 22 to enter the air gap and form effective magnetic flux as much as possible along the area between the magnetic slot structure 2 and the d-axis magnetic barrier slot 5.

[0047] In this invention, by making w2≥w1, or even w2≥1.15*w1; and making h2≤h1, or even h2≤0.75*h1, the path of magnetic field lines entering the air gap can be guided, thereby improving the sinusoidal nature of the air gap magnetic flux density.

[0048] In some implementations, such as Figure 1 As shown, the aforementioned d-axis magnetic barrier groove 5 can be in the shape of a straight line and extends radially along the rotor lamination 1 to form a long side in the radial direction of the rotor lamination 1. The two ends of the d-axis magnetic barrier groove 5 in the length direction can be rounded.

[0049] In some implementations, such as Figure 1-2As shown, when each of the aforementioned magnetic pole forming regions 1a is provided with a d-axis magnetic barrier groove 5 located on the d-axis, the distance between the d-axis magnetic barrier groove 5 and the second magnetic steel groove 22 within the magnetic pole forming region 1a in the d-axis direction is h1, the distance between the d-axis magnetic barrier groove 5 and the outer circle of the rotor lamination 1 in the d-axis direction is h2, and the distance between the second magnetic barrier groove 3 and the outer circle of the rotor lamination 1 in the q-axis direction is h3. Wherein, h3 ≤ h2 < h1. Preferably, h3 < 0.75 * h2 < 0.55 * h1.

[0050] In the above example, by making h3≤h2

[0051] In some implementations, such as Figure 1-2 As shown, the width of the aforementioned third magnetic bridge 15 is w4. The width of the fourth magnetic bridge 11 is w1, where w4 ≤ w1. Preferably, w4 ≤ 0.6 * w1.

[0052] In the example above, by making w4≤w1, or even w4≤0.6*w1, the width of the third magnetic bridge 15 can be limited, thereby preventing the magnets in the first magnetic steel groove 21 from forming a magnetic leakage path around the first magnetic barrier groove 41.

[0053] The aforementioned second magnetic barrier groove 3 can be an elliptical magnetic barrier groove or a circular magnetic barrier groove, etc. In some embodiments, such as... Figure 1-2 As shown, when the aforementioned second magnetic barrier groove 3 is an elliptical magnetic barrier groove, the major axis length of the elliptical magnetic barrier groove is n1, and the minor axis length is n2. Wherein, n1 is greater than n2. Preferably, n1 ≥ 2.75 * n2.

[0054] It should be noted that the aforementioned second magnetic barrier groove 3 and the magnetic barrier groove group form a second magnetic bridge 9.

[0055] In the above example, by making n1≥2.75*n2, the relationship between the major axis length and minor axis length of the elliptical magnetic barrier groove is restricted. This restricts the length and width of the magnetic circuits of the aforementioned fifth magnetic bridge 8 and second magnetic bridge 9, and allows the second magnetic barrier groove 3 to better play its role in the leakage magnetic circuit and saturation magnetic circuit in the high-speed light load region and the low-speed heavy load region.

[0056] In some implementations, such as Figure 1-2 ​As shown, when the second magnetic barrier slot 3 is an elliptical magnetic barrier slot, the minor axis direction of the elliptical magnetic barrier slot can be the radial direction of the rotor lamination 1. The second magnetic barrier slot 3 can be symmetrically arranged about the q-axis at its location.

[0057] In this invention, the second magnetic barrier slot 3 is designed as an elliptical magnetic barrier slot or a circular magnetic barrier slot. When the second magnetic barrier slot 3 is designed as an elliptical magnetic barrier slot, n1≥2.75*n2; h3≤h2

[0058] In some implementations, such as Figure 1 As shown, the first magnetic steel groove 21 and the second magnetic steel groove 22 located on the same side of the d-axis in the aforementioned magnetic pole forming region 1a are connected through the first air groove 6, which can avoid interference between the magnets in the first magnetic steel groove 21 and the second magnetic steel groove 22.

[0059] In some embodiments, the aforementioned first magnetic barrier groove 41 can be an arc-shaped groove, and the arc-shaped groove is opposite to one end of the corresponding first magnetic groove 21 in the length direction through the convex surface 411. This can further optimize the magnetic field line path of the motor q-axis and reduce the leakage flux of the motor at the q-axis.

[0060] In the second example, such as Figure 3 As shown, the aforementioned magnet slot structure 2 is a slanted structure symmetrically arranged about the d-axis within the magnetic pole forming region 1a. The two first magnet slots 21 within the magnet slot structure 2 are both lateral extensions of the slanted structure, and the bottoms of the two first magnet slots 21 are connected via a second air slot 14. In a specific application example, the magnet slot structure 2 is V-shaped.

[0061] ​Compared to the aforementioned design scheme involving the first magnet slot 21, the second magnet slot 22, and the fourth magnetic bridge 11, in the second example, by connecting the bottoms of the two first magnet slots 21 through the second air slot 14, the assembly of the magnets within the second magnet slot 22 can be eliminated. Only the magnets within the first magnet slots 21 need to be assembled, thus simplifying the assembly process. Furthermore, since the bottoms of the two first magnet slots 21 are connected through the second air slot 14, the fourth magnetic bridge 11 is no longer required compared to the first example. While the presence of the fourth magnetic bridge 11 in the first example increases the magnetic circuit, it also poses a risk of magnetic leakage. In this second example, removing the fourth magnetic bridge 11 eliminates magnetic leakage at the fourth magnetic bridge 11 and along the magnetic circuit surrounding the d-axis magnetic barrier slot 5. This reduces magnetic leakage along the motor's d-axis, increases the utilization of the permanent magnet flux, and consequently improves the utilization rate of the magnets, such as permanent magnets, thereby increasing the motor's output torque and efficiency.

[0062] In some implementations, such as Figure 2 As shown, the angle between each of the aforementioned first magnet slots 21 and the d-axis within the magnetic pole forming region 1a is α, satisfying α≥35°.

[0063] In some implementations, such as Figure 1 As shown, the two adjacent first magnetic barrier slots 41 on both sides of the q-axis can be symmetrically arranged, and the ends of the two first magnetic barrier slots 41 facing away from the q-axis can be rounded.

[0064] It should be noted here that: (as...) Figure 1 As shown, the aforementioned rotor lamination 1 also has a shaft hole 13 for the rotating shaft to be fitted. The aforementioned magnet slot structures 2 are evenly spaced along the circumference of the rotor lamination 1, the second magnetic barrier slots 3 are also evenly spaced along the circumference of the rotor lamination 1, and the d-axis magnetic barrier slots 5 are also evenly distributed along the circumference of the rotor lamination 1. Two adjacent first magnetic barrier slots 41 on both sides of the q-axis form a magnetic barrier slot group, and each magnetic barrier slot group is evenly spaced along the circumference of the rotor lamination 1.

[0065] The magnetic steel slot structure 2, the magnetic barrier slot group and the second magnetic barrier slot 3 set in this invention can optimize the magnetic circuit of the rotor magnetic field while ensuring the mechanical strength of the motor, realize the reasonable adjustment of the loss distribution of the motor under different loads, improve the motor efficiency, and thus improve the energy consumption level and operation stability of the air conditioner.

[0066] The aforementioned rotor lamination 1 can be made of a magnetically conductive material.

[0067] In some embodiments, the present invention also provides a rotor core, which may include the rotor laminations 1 of any of the above.

[0068] In some embodiments, the present invention also provides a rotor comprising the rotor laminations 1 of any of the above; or comprising the rotor core described above.

[0069] When the rotor includes the aforementioned rotor core, a rotor assembly dynamic balance adjustment structure is also provided on the rotor core.

[0070] In some implementations, such as Figure 1-2 As shown, when the magnet groove structure 2 is a slanted structure symmetrically arranged about the d-axis within the magnetic pole forming region 1a, wherein the two first magnet grooves 21 within the magnet groove structure 2 are both lateral extension grooves of the slanted structure; the magnet groove structure 2 also includes two second magnet grooves 22 located at the bottom, the two second magnet grooves 22 being located on both sides of the d-axis within the magnetic pole forming region 1a, and forming a fourth magnetic bridge 11 between the two second magnet grooves 22, each first magnet groove 21 is equipped with a first magnet 16, and each second magnet groove 22 is equipped with a second magnet 17, each first magnet 16 and each second magnet 17 are magnetized along their respective thickness direction, and the length of the first magnet 16 is L1, the length of the second magnet 17 is L2, and L1≥L2. Preferably, L1≥2*L2.

[0071] In the above example, by making L1≥L2, or even L1≥2*L2, the path of the magnetic field lines of the magnet entering the air gap can be shortened, and the leakage magnetic problem caused by the presence of the fourth magnetic bridge 11 can be reduced. Specifically, the longer the length L1 of the first magnet 16, the more magnetic flux forms a series magnetic circuit with the magnetic field lines emanating from the adjacent magnetic poles, thus avoiding the formation of inter-pole leakage magnetic flux through the fourth magnetic bridge 11 and then through the path between the second magnetic barrier slot 3 and the magnetic barrier slot group.

[0072] In some embodiments, both the first magnet 16 and the second magnet 17 can be permanent magnets. Preferably, both the first magnet 16 and the second magnet 17 can be sintered permanent magnets, which is intended to enable the motor to adapt to applications with high performance and temperature rise requirements.

[0073] Both the first magnet 16 and the second magnet 17 can be rectangular in shape. In a cross-section perpendicular to the rotor axis, the magnetization direction of both the first magnet 16 and the second magnet 17 is perpendicular to their respective long sides and points towards the air gap between the stator and the rotor. In other words, both the first magnet 16 and the second magnet 17 are magnetized along their respective thickness directions. The thicknesses of the first magnet 16 and the second magnet 17 can be equal. Figure 2 As shown, the thickness of the first magnet 16 is b1, and the thickness of the second magnet 17 is b2.

[0074] In some embodiments, the present invention also provides an electric motor, which may include the rotor lamination 1 of any of the above; or include the rotor core of the above; or include the rotor of the above.

[0075] In some embodiments, the present invention also provides an air conditioner, which may include the rotor lamination 1 of any of the above; or include the rotor core of the above; or include the rotor of the above; or include the motor of the above.

[0076] This invention utilizes a first magnet 16 and a second magnet 17 installed inside the rotor core to provide permanent magnet flux to the rotor, enhancing the motor's magnetic focusing ability and thus improving its torque output and torque density. Both the first magnet 16 and the second magnet 17 can be permanent magnets. Furthermore, the invention optimizes the path of magnetic lines of force entering the air gap by using a q-axis magnetic barrier slot, a group of magnetic barrier slots, and a second magnetic barrier slot 3 inside the rotor core, improving the sinusoidal nature of the air gap magnetic flux density and enabling reasonable adjustment of the motor's loss distribution under different loads. The invention also optimizes the path of magnetic lines of force through magnetic bridges between magnet slots, between the first magnetic barrier slots 41, and between magnet slots and the first magnetic barrier slot 41, further improving the mechanical strength of the motor rotor. In short, this invention improves overall efficiency by reasonably adjusting the motor's loss distribution under different load conditions and solves the problems of difficulty in improving efficiency and poor field weakening ability in traditional permanent magnet motors.

[0077] 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.

[0078] 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 rotor has two or more magnetic pole forming regions (1a) corresponding to the rotor magnetic poles. Each magnetic pole forming region (1a) is provided with a magnetic steel groove structure (2). The magnetic steel groove structure (2) has two first magnetic steel grooves (21) that are symmetrical about the d-axis in the magnetic pole forming region (1a) and relatively open. The opening formed by the two first magnetic steel grooves (21) faces the outer periphery of the rotor lamination (1). In the magnetic pole forming region (1a), a first magnetic barrier groove (41) is provided on the outer side of the two first magnetic steel grooves (2) in the length direction. Each first magnetic barrier groove (41) forms a first magnetic bridge (10) with the corresponding first magnetic steel groove (2). The rotor lamination (1) is also provided with a second magnetic barrier groove (3) located on the q-axis; the second magnetic barrier groove (3) and the two first magnetic barrier grooves (41) adjacent to each other on both sides of the q-axis are arranged at intervals and a second magnetic bridge (9) is formed at each interval, and each second magnetic bridge (9) is located on the side of the corresponding first magnetic barrier groove (41) away from the first magnetic bridge (10); wherein, a third magnetic bridge (15) is also formed between the two adjacent first magnetic barrier grooves (41) on both sides of the q-axis.

2. The rotor lamination (1) according to claim 1, characterized in that: Each of the magnetic pole forming regions (1a) is provided with a d-axis magnetic barrier groove (5) located on the d-axis.

3. The rotor lamination (1) according to claim 1, characterized in that: The width of the first magnetic bridge (10) is w3, and the width of the third magnetic bridge (15) is w4; w3≤w4.

4. The rotor lamination (1) according to any one of claims 1-3, characterized in that: The magnetic steel groove structure (2) is a slanted structure symmetrically arranged about the d-axis within the magnetic pole forming region (1a). The two first magnetic steel grooves (21) within the magnetic steel groove structure (2) are both lateral extensions of the slanted structure. The magnetic steel groove structure (2) also includes two second magnetic steel grooves (22) located at the bottom. The two second magnetic steel grooves (22) are located on both sides of the d-axis within the magnetic pole forming region (1a), and a fourth magnetic bridge (11) is formed between the two second magnetic steel grooves (22).

5. The rotor lamination (1) according to claim 4, characterized in that: When each of the magnetic pole forming regions (1a) is provided with a d-axis magnetic barrier groove (5) located on the d-axis, the magnetic steel groove structure (2) is closer to the radial inner side of the rotor lamination (1) relative to the d-axis magnetic barrier groove (5) in the magnetic pole forming region (1a); wherein, the width of the d-axis magnetic barrier groove (5) between the two sides of the d-axis is w2, and the width of the fourth magnetic bridge (11) is w1, wherein w2≥w1.

6. The rotor lamination (1) according to claim 4, characterized in that: When each of the magnetic pole forming regions (1a) is provided with a d-axis magnetic barrier groove (5) located on the d-axis, the distance between the d-axis magnetic barrier groove (5) and the second magnetic steel groove (22) in the magnetic pole forming region (1a) is h1 in the d-axis direction, and the distance between the d-axis magnetic barrier groove (5) and the outer circle of the rotor lamination (1) in the d-axis direction is h2, wherein h2≤h1.

7. The rotor lamination (1) according to claim 4, characterized in that: When each of the magnetic pole forming regions (1a) is provided with a d-axis magnetic barrier groove (5) located on the d-axis, the distance between the d-axis magnetic barrier groove (5) and the second magnetic steel groove (22) in the magnetic pole forming region (1a) in the d-axis direction is h1, the distance between the d-axis magnetic barrier groove (5) and the outer circle of the rotor lamination (1) in the d-axis direction is h2, and the distance between the second magnetic barrier groove (3) and the outer circle of the rotor lamination (1) in the q-axis direction is h3; wherein, h3≤h2<h1.

8. The rotor lamination (1) according to claim 4, characterized in that: The width of the third magnetic bridge (15) is w4; the width of the fourth magnetic bridge (11) is w1, and w4≤w1.

9. The rotor lamination (1) according to claim 8, characterized in that: The first magnetic steel groove (21) and the second magnetic steel groove (22) located on the same side of the d-axis in each of the magnetic pole forming regions (1a) are connected through the first air groove (6).

10. The rotor lamination (1) according to any one of claims 1-3 and 5-9, characterized in that: The second magnetic barrier groove (3) is an elliptical magnetic barrier groove, the major axis of which is n1 and the minor axis is n2, n1≥2.75*n2; And / or, the first magnetic barrier groove (41) is an arc-shaped groove, and the arc-shaped groove is opposite to one end of the corresponding first magnetic groove (21) in the length direction through the convex surface (411).

11. The rotor lamination (1) according to any one of claims 1-3, characterized in that: The magnet slot structure (2) is a slanted structure symmetrically arranged about the d-axis within the magnetic pole forming region (1a). The two first magnet slots (21) within the magnet slot structure (2) are both lateral extension slots of the slanted structure, and the bottoms of the two first magnet slots (21) within the magnet slot structure (2) are connected through a second air slot (14).

12. A rotor core, characterized in that: It includes the rotor lamination (1) according to any one of claims 1-11.

13. A rotor, characterized in that: It includes the rotor lamination (1) as described in any one of claims 1-11; or it includes the rotor core as described in claim 12.

14. The rotor according to claim 13, characterized in that: When the magnet groove structure (2) is a slanted structure symmetrically arranged about the d-axis within the magnetic pole forming region (1a), wherein the two first magnet grooves (21) within the magnet groove structure (2) are both lateral extension grooves of the slanted structure; the magnet groove structure (2) also includes two second magnet grooves (22) located at the bottom, the two second magnet grooves (22) are located on both sides of the d-axis within the magnetic pole forming region (1a), and a fourth magnetic bridge (11) is formed between the two second magnet grooves (22), each first magnet groove (21) is equipped with a first magnet (16), and each second magnet groove (22) is equipped with a second magnet (17), each first magnet (16) and each second magnet (17) are magnetized along their respective thickness direction, and the length of the first magnet (16) is L1, the length of the second magnet (17) is L2, and L1≥L2.

15. An electric motor, characterized in that: It includes the rotor lamination (1) of any one of claims 1-11; or the rotor core of claim 12; or the rotor of claim 13 or 14.

16. An air conditioner, characterized in that: It includes the rotor lamination (1) of any one of claims 1-11; or the rotor core of claim 12; or the rotor of claim 13 or 14; or the motor of claim 15.

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