Rotor, motor, compressor and air conditioning system

Abstract

The utility model provides a rotor, a motor, a compressor and an air conditioning system. Magnetic steel grooves are formed in the rotor core, at least one magnetic steel groove comprises an installation groove, a first groove and a second groove, the first groove and the second groove are located on the two sides of the magnetic steel groove respectively in the circumferential direction of the rotor core, the first groove is located on the upstream side of the second groove in the rotation direction of the rotor core, and the permanent magnets are arranged in the installation grooves; in a cross section perpendicular to the axis of the rotor core, the area of the first groove is a first area, the area of the second groove is a second area, and the first area is larger than the second area. According to the rotor provided by the utility model, along the rotation direction of the rotor iron core, the first area of the first groove located at the upstream side is larger than the second area of the second groove located at the downstream side, so that the magnetic bridge center line between the first groove and the second groove shifts towards the rotation direction, the magnetic leakage condition is further improved, and the torque and the motor performance are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, and in particular to a rotor, a motor, a compressor and an air-conditioning system. Background Art

[0002] Currently, if Figure 1 As shown, the rotor includes rotor silicon steel, rotor slots 2' and permanent magnets 1', and the permanent magnets 1' are embedded in the rotor slots 2'. The rotor is a symmetrical structure as a whole. When the rotor is partially saturated, the armature reaction of the motor will cause large torque fluctuations under heavy load operation, and the maximum torque is limited. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0004] To this end, a first aspect of the utility model provides a rotor.

[0005] The second aspect of the utility model also provides a motor.

[0006] The third aspect of the utility model also provides a compressor.

[0007] The fourth aspect of the utility model also provides an air conditioning system.

[0008] In view of this, the first aspect of the utility model proposes a rotor, comprising: a permanent magnet; a rotor core, the rotor core is provided with a magnetic steel slot, at least one magnetic steel slot includes a mounting slot, a first slot and a second slot, along the circumference of the rotor core, the first slot and the second slot are respectively located on both sides of the magnetic steel slot, along the rotation direction of the rotor core, the first slot is located on the upstream side of the second slot, and the permanent magnet is arranged in the mounting slot; in a cross section perpendicular to the axis of the rotor core, the area of ​​the first slot is the first area, the area of ​​the second slot is the second area, and the first area is greater than the second area.

[0009] The rotor provided by the utility model comprises a permanent magnet and a rotor core, and a magnetic steel slot is arranged on the rotor core, and the magnetic steel slot comprises a mounting slot and a first slot and a second slot located on both sides of the mounting slot along the circumference of the rotor core. Along the rotation direction of the rotor core, the first slot is located on the upstream side of the second slot, that is, the first slot is the one located on the front side along the rotation direction, and the second slot is the one located on the rear side along the rotation direction. The first area of ​​the first slot located on the upstream side is larger than the second area of ​​the second slot located on the downstream side, so that the center line of the magnetic bridge between the first slot and the second slot is offset in the rotation direction, thereby improving the leakage magnetic condition, reducing the torque pulsation, improving the noise of the motor, and thereby improving the torque size and motor performance.

[0010] The rotor provided by the utility model may also have the following additional technical features:

[0011] In some technical schemes, optionally, the center line between the poles of two adjacent permanent magnets is the first center line, and the center line of any pole is the second center line; the number of pole pairs of the rotor is P, the angle between the adjacent first center line and the second center line is β, and β and P satisfy the following relationship: β=π÷2÷P, where π is 180°; along the circumference of the rotor core, the part of the rotor core located between the adjacent first slots and the second slots is a magnetic bridge, and the angle between the adjacent first center line and the center line of the magnetic bridge is α, and α and β satisfy the following relationship: 0.02≤α / β≤0.3.

[0012] In this technical solution, the center line between two adjacent magnetic poles is the first center line, the center line of any magnetic pole is the second center line, and the angle between the adjacent first center line and the second center line is β, β = π ÷ 2 ÷ P, so as to obtain the angle between the adjacent first center line and the second center line. After the first slot and the second slot are set to different shapes, the lengths of the first slot and the second slot along the circumference of the rotor core are different, so that the center line of the magnetic bridge between the first slot and the second slot is deflected. Specifically, the angle between the center line of the magnetic bridge and the first center line is α, that is, the center line of the magnetic bridge is deflected by an angle of α relative to the first center line. The ratio of α to β is limited to between 0.02 and 0.3, so that the leakage magnetic flux is reduced, the influence on the armature reaction is reduced, and the torque pulsation can be reduced, and the noise of the motor is improved, so as to achieve the effect of improving the torque and motor performance.

[0013] In some technical schemes, optionally, along the circumference of the rotor core, the length of the magnetic bridge is t, the distance between the side of the first slot and / or the second slot facing the outer wall of the rotor core and the outer wall of the rotor core is b, and t and b satisfy the following relationship: 0.2≤b / t≤1.2.

[0014] In this technical solution, along the circumference of the rotor core, the length of the magnetic bridge is t, and the distance between the first slot and / or the second slot facing the outer side wall of the rotor core and the outer side wall of the rotor core is b. Both b and t can enhance the strength of the rotor core. Limiting the ratio of b to t to between 0.2 and 1.2 can both ensure the strength of the rotor core and reduce magnetic leakage.

[0015] In some technical schemes, optionally, in any magnetic steel slot, the number of first slots is multiple, the multiple first slots are arranged at intervals along the circumference of the rotor core, and the first area is the sum of the areas of the multiple first slots; and / or in any magnetic steel slot, the number of second slots is multiple, the multiple second slots are arranged at intervals along the circumference of the rotor core, and the second area is the sum of the areas of the multiple second slots.

[0016] In this technical solution, in any magnetic steel slot, there are multiple first slots, which are arranged at intervals, that is, the first slot can be divided into multiple parts, so as to reduce magnetic leakage while ensuring the strength of the rotor core, so that the first area is the sum of the areas of the multiple slot bodies divided by the first slot. Correspondingly, in any magnetic steel slot, there are multiple second slots, which are arranged at intervals, that is, the second slot can be divided into multiple parts, so as to reduce magnetic leakage while ensuring the strength of the rotor core, so that the second area is the sum of the areas of the multiple slot bodies divided by the second slot.

[0017] In some technical solutions, optionally, there is a gap between at least one of the two opposite side walls of the installation slot and the permanent magnet.

[0018] In this technical solution, there is a gap between at least one of the two opposite side walls of the installation slot and the permanent magnet, so that there is a certain gap between the permanent magnet and the installation slot to ensure that the permanent magnet can be smoothly inserted into the installation slot.

[0019] In some technical solutions, optionally, at least one of the two opposite side walls of the installation groove is provided with a protrusion, the protrusion protrudes into the installation groove, and the permanent magnet contacts the protrusion.

[0020] In this technical solution, at least one of the two opposite side walls of the installation groove is provided with a protrusion, and the protrusion cooperates with the permanent magnet, which is beneficial to the fixation of the permanent magnet.

[0021] In some technical schemes, optionally, the mounting groove includes a strip groove; wherein, a portion of the first groove and a portion of the second groove both protrude in a direction away from the outer wall surface of the rotor core, and the width of the first groove gradually increases in a direction away from the corresponding mounting groove, and the width of the second groove gradually increases in a direction away from the corresponding mounting groove.

[0022] In this technical solution, the mounting groove can be a strip-shaped groove, so that the permanent magnet is in a straight line shape, wherein a portion of the first groove and a portion of the second groove both protrude radially inwardly of the rotor core, thereby increasing the area of ​​the first groove and the second groove, and ensuring the distance between the first groove and the outer wall of the rotor core, as well as the distance between the second groove and the outer wall of the rotor core, thereby ensuring the strength of the rotor core. At the same time, the width of the first groove and the width of the second groove both gradually increase in the direction away from the corresponding mounting groove, so as to increase the area of ​​the first groove and the second groove, improve the magnetic leakage situation, and enhance the motor performance.

[0023] In some technical solutions, optionally, the mounting groove includes a V-shaped groove, the opening of which is away from the axis of the rotor core; the first groove and the second groove extend along the rotation direction respectively, and along the rotation direction, the length of the first groove is greater than the length of the second groove.

[0024] In this technical solution, the mounting groove includes a V-shaped groove, so that the permanent magnets in the V-shaped groove are arranged in a V shape, which improves the torque density and the efficiency of the motor. Among them, the first groove and the second groove both extend along the rotation direction, and the length of the first groove is greater than the length of the second groove, thereby improving the leakage magnetic field and improving the motor performance.

[0025] According to a second aspect of the present invention, a motor is also proposed, comprising: a rotor as proposed in any of the above technical solutions.

[0026] The motor provided in the second aspect of the utility model comprises the rotor proposed in any of the above technical solutions and therefore has all the beneficial effects of the rotor.

[0027] According to a third aspect of the present invention, a compressor is also proposed, comprising: a rotor as proposed in any technical solution of the above-mentioned first aspect or a motor as proposed in any technical solution of the above-mentioned second aspect.

[0028] The compressor provided in the third aspect of the utility model comprises the rotor or motor proposed in any of the above technical solutions, and therefore has all the beneficial effects of the rotor or motor.

[0029] According to a fourth aspect of the present utility model, an air conditioning system is also proposed, comprising: a rotor or a motor or a compressor as proposed in any of the above technical solutions.

[0030] The air conditioning system provided in the fourth aspect of the utility model comprises the rotor or motor or compressor proposed in any of the above technical solutions, and therefore has all the beneficial effects of the rotor or motor or compressor.

[0031] Additional aspects and advantages of the present invention will become apparent in the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 A schematic structural diagram of a rotor in the related art is shown.

[0034] in, Figure 1 The corresponding relationship between the reference numerals and the component names is as follows:

[0035] 1' permanent magnet, 2' rotor slot.

[0036] Figure 2 One of the structural schematic diagrams of the rotor of one embodiment of the utility model is shown;

[0037] Figure 3 Shows Figure 2One of the partial structural schematic diagrams of the illustrated embodiment;

[0038] Figure 4 Shows Figure 2 The second schematic diagram of a part of the structure of the embodiment shown;

[0039] Figure 5 A second schematic diagram of the structure of a rotor according to an embodiment of the utility model is shown;

[0040] Figure 6 Shows Figure 5 A schematic diagram of a partial structure of the rotor shown;

[0041] Figure 7 A third schematic diagram of the structure of a rotor according to an embodiment of the utility model is shown;

[0042] Figure 8 A diagram showing the changes between α / β, torque fluctuation and torque of an embodiment of the utility model under the same current;

[0043] Fig. 9 A comparison chart of torque and torque fluctuation between the present application and related technologies is shown.

[0044] in, Figures 2 to 7 The corresponding relationship between the reference numerals and the component names is as follows:

[0045] 1 permanent magnet, 10 first wall, 11 second wall, 2 rotor core, 20 magnetic steel slot, 21 mounting slot, 210 protrusion, 22 first slot, 23 second slot, 24 magnetic bridge. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0048] Refer to the following Figures 2 to 9 The present invention describes a rotor, a motor, a compressor and an air-conditioning system according to some embodiments of the present invention.

[0049] like Figure 2 , Figure 3 and Figure 4As shown, according to an embodiment of the present invention, the present invention proposes a rotor, comprising: a permanent magnet 1 and a rotor core 2. Specifically, a magnetic steel slot 20 is provided on the rotor core 2, and at least one magnetic steel slot 20 includes a mounting slot 21, a first slot 22 and a second slot 23. Along the circumference of the rotor core 2, the first slot 22 and the second slot 23 are respectively located on both sides of the magnetic steel slot 20. Along the rotation direction of the rotor core 2, the first slot 22 is located on the upstream side of the second slot 23, and the permanent magnet 1 is arranged in the mounting slot 21. In a cross section perpendicular to the axis of the rotor core 2, the area of ​​the first slot 22 is the first area, the area of ​​the second slot 23 is the second area, and the first area is greater than the second area.

[0050] The rotor provided by the utility model comprises a permanent magnet 1 and a rotor core 2, wherein a magnetic steel slot 20 is arranged on the rotor core 2, and the magnetic steel slot 20 comprises a mounting slot 21 and a first slot 22 and a second slot 23 located on both sides of the mounting slot 21 along the circumferential direction of the rotor core 2. Along the rotation direction W of the rotor core 2, the first slot 22 is located on the upstream side of the second slot 23, that is, the first slot 22 is the one located on the front side along the rotation direction W, and the second slot 23 is the one located on the rear side along the rotation direction W, and the first area (shaded area) of the first slot 22 located on the upstream side is greater than the second area (shaded area) of the second slot 23 located on the downstream side, so that the center line of the magnetic bridge 24 between the first slot 22 and the second slot 23 is offset in the rotation direction W, thereby improving the leakage magnetic condition, reducing the torque pulsation, improving the noise of the motor, and thereby improving the torque size and motor performance.

[0051] Among them, Figure 4 As shown, the wall surface of the permanent magnet 1 facing the first slot 22 is the first wall surface 10, and the wall surface facing the second slot 23 is the second wall surface 11. The first area is the area enclosed by the first wall surface 10 or the extension line of the first wall surface 10 and the contour line of the first slot 22, and the second area is the area enclosed by the second wall surface 11 or the extension line of the second wall surface 11 and the contour line of the second slot 23.

[0052] Specifically, when the first wall 10 of the permanent magnet 1 completely closes the side of the first groove 22 facing the permanent magnet 1, the first area is the area of ​​the closed area enclosed by the first wall 10 and the contour line of the first groove 22. When the first wall 10 of the permanent magnet 1 cannot completely close the side of the first groove 22 facing the permanent magnet 1, that is, there is a gap between the permanent magnet 1 and the wall of the installation groove 21, at this time, the area of ​​the closed area enclosed by the extension line of the first wall 10 and the contour line of the first groove 22 is taken as the first area. Correspondingly, when the second wall surface 11 of the permanent magnet 1 completely closes the side of the second groove 23 facing the permanent magnet 1, the second area is the area of ​​the closed area enclosed by the second wall surface 11 and the contour line of the second groove 23. When the second wall surface 11 of the permanent magnet 1 cannot completely close the side of the second groove 23 facing the permanent magnet 1, that is, there is a gap between the permanent magnet 1 and the wall surface of the installation groove 21, at this time, the area of ​​the closed area enclosed by the extension line of the second wall surface 11 and the contour line of the second groove 23 is taken as the second area.

[0053] It can be understood that the first groove 22 , the second groove 23 and the mounting groove 21 are connected.

[0054] It can be understood that the first slot 22 and the second slot 23 have different shapes, so that the first slot 22 and the second slot 23 are asymmetric with respect to the center line of the magnetic pole.

[0055] Specifically, the permanent magnet 1 is disposed in the mounting groove 21 between the first groove 22 and the second groove 23 to form a magnetic pole, and the first groove 22 and the second groove 23 are asymmetric with respect to a center line of the magnetic pole therebetween.

[0056] It can be understood that both the first groove 22 and the second groove 23 are communicated with the mounting groove 21 .

[0057] like Figure 3 As shown, in some embodiments, optionally, in a cross section perpendicular to the axis of the rotor core 2 , along the circumferential direction of the rotor core 2 , the length of the first slot 22 is different from the length of the second slot 23 .

[0058] In this embodiment, in a cross section perpendicular to the axis of the rotor core 2, along the circumferential direction of the rotor core 2, the length of the first slot 22 is different from the length of the second slot 23, so that the first slot 22 and the second slot 23 are asymmetric structures, so as to reduce torque fluctuations and improve the noise of the motor, which is beneficial to improve the torque while ensuring the influence of motor noise, thereby improving the performance of the motor.

[0059] like Figure 3 , Figure 4 , Figure 5 and Figure 7As shown, in some embodiments, optionally, the center line between the magnetic poles of two adjacent permanent magnets 1 is the first center line L1, and the center line of any magnetic pole is the second center line L2; the number of pole pairs of the rotor is P, and the angle between the adjacent first center line L1 and the second center line L2 is β, and β and P satisfy the following relationship: β=π÷2÷P, where π is 180°; along the circumference of the rotor core 2, the part of the rotor core 2 located between the adjacent first slots 22 and the second slots 23 is the magnetic bridge 24, and the angle between the adjacent first center line L1 and the center line L3 of the magnetic bridge 24 is α, and α and β satisfy the following relationship: 0.02≤α / β≤0.3.

[0060] In this embodiment, the center line between two adjacent magnetic poles is the first center line L1, the center line of any magnetic pole is the second center line L2, and the angle between the adjacent first center line L1 and the second center line L2 is β, β=π÷2÷P, so as to obtain the angle between the adjacent first center line L1 and the second center line L2. After the first slot 22 and the second slot 23 are set to different shapes, the lengths of the first slot 22 and the second slot 23 along the circumference of the rotor core 2 are different, so that the center line L3 of the magnetic bridge 24 between the first slot 22 and the second slot 23 is deflected. Specifically, the angle between the center line L3 of the magnetic bridge 24 and the first center line L1 is α, that is, the center line L3 of the magnetic bridge 24 is deflected by an angle of α relative to the first center line L1, and the ratio of α to β is limited to between 0.02 and 0.3, so that the leakage magnetic flux is reduced, the influence on the armature reaction is reduced, and the torque pulsation can be reduced, and the noise of the motor is improved, so as to achieve the effect of improving the torque and motor performance.

[0061] Alternatively, if Figure 8 As shown, with the increase of the ratio between α and β, the torque first increases and then decreases. With the increase of the ratio between the two, the torque fluctuation first decreases and then increases. Limiting α / β to between 0.02 and 0.3 can both adjust the torque fluctuation downward and increase the torque value.

[0062] Optionally, α / β is equal to any value of 0.05, 0.08, 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, or 0.3.

[0063] In a specific application, the rotor includes a d-axis located on the center line of the magnetic pole (i.e., the second center line L2), that is, the d-axis is the center line of any magnetic pole passing through the axis. β is the angle between the d-axis and the center line between adjacent magnetic poles (the first center line L1).

[0064] like Figure 3As shown, in some embodiments, optionally, along the circumference of the rotor core 2, the length of the magnetic bridge 24 is t, the distance between the side of the first slot 22 and / or the second slot 23 facing the outer wall of the rotor core 2 and the outer wall of the rotor core 2 is b, and t and b satisfy the following relationship: 0.2≤b / t≤1.2.

[0065] In this embodiment, along the circumference of the rotor core 2, the length of the magnetic bridge 24 is t, and the distance between the first slot 22 and / or the second slot 23 and the outer wall of the rotor core 2 is b. Both b and t can enhance the strength of the rotor core 2. The ratio of b to t is limited to between 0.2 and 1.2, which can both ensure the strength of the rotor core 2 and reduce magnetic leakage.

[0066] Optionally, b / t is equal to any value among 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, and 1.2.

[0067] It can be understood that the portion between the side of the first slot 22 and / or the second slot 23 facing the outer side wall of the rotor core 2 and the outer side wall of the rotor core 2 is a magnetic bridge structure.

[0068] In some embodiments, optionally, in any magnetic steel slot 20, the number of first slots 22 is multiple, the multiple first slots 22 are arranged at circumferential intervals along the rotor core 2, and the first area is the sum of the areas of the multiple first slots 22; and / or in any magnetic steel slot 20, the number of second slots 23 is multiple, the multiple second slots 23 are arranged at circumferential intervals along the rotor core 2, and the second area is the sum of the areas of the multiple second slots 23.

[0069] In this embodiment, in any magnetic steel slot 20, there are multiple first slots 22, and multiple first slots 22 are arranged at intervals, that is, the first slot 22 can be divided into multiple parts, so as to reduce magnetic leakage and ensure the strength of the rotor core 2, so that the first area is the sum of the areas of the multiple slot bodies divided by the first slot 22. Correspondingly, in any magnetic steel slot 20, there are multiple second slots 23, and multiple second slots 23 are arranged at intervals, that is, the second slot 23 can be divided into multiple parts, so as to reduce magnetic leakage and ensure the strength of the rotor core 2, so that the second area is the sum of the areas of the multiple slot bodies divided by the second slot 23.

[0070] like Figure 5 and Figure 6 As shown, in some embodiments, optionally, there is a gap between at least one of the two opposite side walls of the installation groove 21 and the permanent magnet 1 .

[0071] In this embodiment, there is a gap between at least one of the two opposite side walls of the installation slot 21 and the permanent magnet 1 , so that there is a certain gap between the permanent magnet 1 and the installation slot 21 to ensure that the permanent magnet 1 can be smoothly inserted into the installation slot 21 .

[0072] Optionally, there is a gap between at least one of the two radial side walls of the installation groove 21 and the permanent magnet 1 .

[0073] like Figure 6 As shown, in some embodiments, optionally, at least one of the two opposite side walls of the installation slot 21 is provided with a protrusion 210 , the protrusion 210 protrudes into the installation slot 21 , and the permanent magnet 1 contacts the protrusion 210 .

[0074] In this embodiment, at least one of the two opposite side walls of the installation groove 21 is provided with a protrusion 210 , and the protrusion 210 cooperates with the permanent magnet 1 , which is beneficial to fix the permanent magnet 1 .

[0075] It can be understood that when a protrusion 210 is provided on at least one of the two opposite side walls of the mounting groove 21, after the permanent magnet 1 is installed in the mounting groove 21, the first groove 22 and the second groove 23 on the left and right sides of the permanent magnet 1 are connected. At this time, the first area of ​​the first groove 22 is the area of ​​the closed area enclosed by the extension line of the first wall surface 10 of the permanent magnet 1 and the contour line of the first groove 22, and the second area of ​​the second groove 23 is the area of ​​the closed area enclosed by the extension line of the second wall surface 11 of the permanent magnet 1 and the contour line of the second groove 23.

[0076] In some embodiments, optionally, the mounting groove 21 includes a strip groove; wherein a portion of the first groove 22 and a portion of the second groove 23 both protrude in a direction away from the outer wall surface of the rotor core 2, and a width h1 of the first groove 22 gradually increases in a direction away from the corresponding mounting groove 21, and a width h2 of the second groove 23 gradually increases in a direction away from the corresponding mounting groove 21.

[0077] In this embodiment, the mounting groove 21 may be a strip-shaped groove, so that the permanent magnet 1 is in a straight line shape. Part of the first groove 22 and part of the second groove 23 both protrude radially inward of the rotor core 2, increasing the area of ​​the first groove 22 and the second groove 23, and ensuring the distance between the first groove 22 and the outer wall of the rotor core 2, and ensuring the distance between the second groove 23 and the outer wall of the rotor core 2, thereby ensuring the strength of the rotor core 2. At the same time, in the direction away from the corresponding mounting groove 21, the width h1 of the first groove 22 and the width h2 of the second groove 23 are gradually increased to increase the area of ​​the first groove 22 and the second groove 23, improve the leakage magnetic condition, and enhance the motor performance.

[0078] like Figure 7As shown, in some embodiments, optionally, the mounting groove 21 includes a V-shaped groove, the opening of which is away from the axis of the rotor core 2; the first groove 22 and the second groove 23 extend along the rotation direction W respectively, and along the rotation direction W, the length of the first groove 22 is greater than the length of the second groove 23.

[0079] In this embodiment, the mounting groove 21 includes a V-shaped groove, the first groove 22 and the second groove 23 both extend along the rotation direction W, and the length of the first groove 22 is greater than the length of the second groove 23, thereby improving the magnetic leakage situation and enhancing the motor performance.

[0080] According to an embodiment of the present invention, a motor is also provided, comprising: a rotor as provided in any of the above embodiments.

[0081] The motor provided by the utility model comprises the rotor proposed in any of the above embodiments, and therefore has all the beneficial effects of the rotor.

[0082] According to an embodiment of the present invention, a compressor is also proposed, comprising: a rotor as proposed in any embodiment of the first aspect above or a motor as proposed in any one of the above items.

[0083] A compressor provided in one embodiment of the utility model comprises a rotor or a motor provided in any of the above embodiments, and thus has all the beneficial effects of the rotor or the motor.

[0084] According to an embodiment of the present utility model, an air conditioning system is also proposed, comprising: a rotor or a motor or a compressor as proposed in any of the above embodiments.

[0085] The air conditioning system provided by the utility model comprises the rotor, motor or compressor proposed in any of the above embodiments, and therefore has all the beneficial effects of the rotor, motor or compressor.

[0086] In a specific application, the rotor includes rotor silicon steel, rotor slots (such as mounting slots 21) and permanent magnets 1, and the permanent magnets 1 are embedded in the rotor slots. The lengths of the left and right sides of the rotor's magnetic bridge 24 are not equal, and the width of the magnetic bridge 24 is t. The width of the magnetic bridge structure on the outside of the rotor is b. The rotor slots include two different slots (such as the first slot 22 and the second slot 23) on both sides, which are located on both sides of the permanent magnet 1, and the first slot 22 and the second slot 23 are asymmetric structures. The first slots 22 and the second slots 23 of different sizes and shapes are arranged on both sides of the rotor slots, and the area of ​​the first slots 22 and the second slots 23 is the closed area of ​​the magnet boundary or the extension line of the magnet boundary and the silicon steel boundary. Along the rotation direction, the area of ​​the air slot A (such as the first slot 22) is greater than the area of ​​the air slot B (such as the second slot 23), that is, Sa>Sb, where Sa is the area of ​​the air slot A and Sb is the area of ​​the air slot B.

[0087] The angle between the center line between the magnetic poles (eg, the first center line L1 ) and the d-axis center line (eg, the second center line L2 ) is β=π÷2÷P.

[0088] The angle between the center line L3 of the magnetic bridge 24 and the center line between the magnetic poles is α, which satisfies 0.02≤α / β≤0.3.

[0089] The distance from the outer side of the magnet to the extension of the magnetic tile is b, and the width of the magnetic bridge 24 is t, which satisfies 0.2≤b / t≤2, and optionally, 0.2≤b / t≤1.2.

[0090] Specifically, Figure 1 The figure shows the rotor structure of the original example, which includes rotor silicon steel, rotor slots 2' and permanent magnets 1', and the permanent magnets 1 are embedded in the rotor slots 2'. The length of the left and right sides of the rotor's magnetic bridge is equal. The rotor is a symmetrical structure as a whole. In the case of partial saturation of the rotor, the armature reaction of the motor causes large torque fluctuations under heavy load operation, and the maximum torque is limited.

[0091] like Figure 2 As an embodiment of the present application, the rotor includes rotor silicon steel (e.g., rotor core 2), rotor slots (e.g., mounting slots 21) and permanent magnets 1, and the permanent magnets 1 are embedded in the rotor slots. The lengths of the left and right sides of the magnetic bridge 24 are not equal, and the width of the magnetic bridge 24 is t. The width of the outer magnetic bridge structure of the rotor is b. The two sides of the rotor slot include two different slots (e.g., a first slot 22 and a second slot 23), and the first slot 22 and the second slot 23 are located on both sides of the permanent magnet 1 and are asymmetric structures. β=π÷2÷P=π÷2÷5=18, in this example, α=1, α / β=0.055 satisfies: 0.02≤α / β≤0.3.

[0092] like Figure 4 This is a partial enlarged view of an embodiment of the present application. Air slots of different sizes and shapes are arranged on both sides of the magnet slot. The area of ​​the air slot is the closed area between the extension line of the magnet boundary and the silicon steel boundary. The area Sa of the air slot A (for example, the first slot 22) along the rotation direction is greater than the area Sb of the air slot B (for example, the second slot 23), that is, Sa>Sb. Sa is the area of ​​the air slot at the front end along the rotation direction of the rotor, and Sb is the area of ​​the air slot at the rear end along the rotation direction of the rotor.

[0093] like Figure 8 As shown, the curve relationship between torque fluctuation, torque and α / β is shown. The torque first increases and then decreases with the increase of the ratio of α to β, and the torque fluctuation first decreases and then increases with the increase of the ratio of α to β, ensuring that the torque fluctuation decreases and the torque value increases in the interval between 0.02 and 0.3.

[0094] Fig. 9This is a comparison chart between the related art and an embodiment of the present application. The asymmetric rotor of the embodiment of the present application has a 1% increase in torque and a 5% decrease in torque fluctuation compared to the related art, which is beneficial to improving noise and torque output performance.

[0095] like Figure 5 As shown, according to one embodiment of the present application, the rotor includes rotor silicon steel, rotor slots and permanent magnets 1, and the permanent magnets 1 are embedded in the rotor slots. The lengths of the extensions on the left and right sides of the magnetic bridge 24 are not equal, and the width of the magnetic bridge 24 is t. The width of the magnetic bridge structure on the outside of the rotor is b. The rotor slots include two different slots (a first slot 22 and a second slot 23) on both sides, which are located on both sides of the permanent magnet 1, and the first slot 22 and the second slot 23 are asymmetric structures. β=π÷2÷P=π÷2÷5=18, in this example α=1, α / β=0.055, satisfying: 0.02≤α / β≤0.3.

[0096] like Figure 6 As shown, a partial enlarged view is shown, with air slots of different sizes and shapes arranged on both sides of the magnet slot, wherein there is a certain gap between the permanent magnet 1 and the silicon steel sheet to ensure the smooth insertion of the permanent magnet 1, and there is a necessary silicon steel protrusion (such as protrusion 210) near the magnet, which is conducive to fixing the permanent magnet 1. At this time, the air slots on the left and right sides of the magnet are connected, and the area of ​​the air slot is the closed area between the extension line of the magnet boundary and the silicon steel boundary. Along the rotation direction, the area of ​​air slot A is larger than that of air slot B, that is, Sa>Sb. Sa is the area of ​​the air slot at the front end along the direction of rotation of the rotor, and Sb is the area of ​​the air slot at the rear end along the direction of rotation of the rotor. The distance from the outside of the magnet to the extension of the magnetic tile is b, and the width of the magnetic bridge 24 is t. In this case, b=0.5, t=1, satisfying: 0.2≤b / t≤2. At this time, the rotor strength is optimal and the magnet leakage is minimal.

[0097] like Figure 7 As shown, according to one embodiment of the present application, the rotor includes rotor silicon steel, rotor slots and permanent magnets 1, and the permanent magnets 1 are embedded in the rotor slots. The lengths of the left and right sides of the magnetic bridge 24 are not equal, and the width of the magnetic bridge 24 is t. The width of the magnetic bridge structure on the outside of the rotor is b. The rotor slots include two different slots (for example, the first slot 22 and the second slot 23) on both sides, which are located on both sides of the permanent magnet 1, and the first slot 22 and the second slot 23 are asymmetric structures. β=π÷2÷P=π÷2÷4=22.5, in this example α=2.5, α / β=0.11, satisfying: 0.02≤α / β≤0.3.

[0098] The beneficial effects of the present application are: it can reduce torque fluctuations, improve motor noise, and at the same time help increase torque and enhance motor performance.

[0099] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0100] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0101] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A rotor, characterized in that: include: permanent magnet; A rotor core, wherein a magnetic steel slot is provided on the rotor core, and at least one of the magnetic steel slots comprises a mounting slot, a first slot and a second slot, wherein along the circumference of the rotor core, the first slot and the second slot are respectively located on both sides of the magnetic steel slot, and along the rotation direction of the rotor core, the first slot is located on the upstream side of the second slot, and the permanent magnet is arranged in the mounting slot; In a cross section perpendicular to the axis of the rotor core, an area of ​​the first slot is a first area, an area of ​​the second slot is a second area, and the first area is greater than the second area.

2. The rotor according to claim 1, characterized in that The center line between the magnetic poles of two adjacent permanent magnets is the first center line, and the center line of any magnetic pole is the second center line; The number of pole pairs of the rotor is P, the angle between the adjacent first center line and the second center line is β, and β and P satisfy the following relationship: β=π÷2÷P, where π is 180°; Along the circumferential direction of the rotor core, the portion of the rotor core located between the adjacent first slots and the second slots is a magnetic bridge, and the angle between the adjacent first center lines and the center line of the magnetic bridge is α, and α and β satisfy the following relationship: 0.02≤α / β≤0.3。 3. The rotor according to claim 2, characterized in that Along the circumference of the rotor core, the length of the magnetic bridge is t, the distance between the side of the first slot and / or the second slot facing the outer side wall of the rotor core and the outer side wall of the rotor core is b, and t and b satisfy the following relationship: 0.2≤b / t≤1.

2.

4. The rotor according to any one of claims 1 to 3, characterized in that There is a gap between at least one of the two opposite side walls of the installation groove and the permanent magnet.

5. The rotor according to claim 4, characterized in that At least one of the two opposite side walls of the installation groove is provided with a protrusion, the protrusion protrudes into the installation groove, and the permanent magnet contacts the protrusion.

6. The rotor according to any one of claims 1 to 3, characterized in that The mounting groove comprises a strip groove; Part of the first groove and part of the second groove both protrude in a direction away from the outer wall surface of the rotor core, and the width of the first groove gradually increases in a direction away from the corresponding installation groove, and the width of the second groove gradually increases in a direction away from the corresponding installation groove.

7. The rotor according to any one of claims 1 to 3, characterized in that The mounting groove comprises a V-shaped groove, and the opening of the V-shaped groove is away from the axis of the rotor core; The first groove and the second groove extend along the rotation direction respectively, and along the rotation direction, the length of the first groove is greater than the length of the second groove.

8. A motor, characterized in that: include: A rotor as claimed in any one of claims 1 to 7.

9. A compressor, characterized in that: include: A rotor as claimed in any one of claims 1 to 7; or The motor as claimed in claim 8.

10. An air conditioning system, characterized in that: include: A rotor as claimed in any one of claims 1 to 7; or The motor as claimed in claim 8; or The compressor as claimed in claim 9.

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