Rotor, motor and compressor

Abstract

The utility model discloses a rotor, motor and compressor relates to motor technical field, the rotor includes rotor core and permanent magnet, the rotor core includes iron core body, the iron core body includes at least one first punching sheet and a plurality of second punching sheets that are laminated along the axial direction, the first punching sheet and the second punching sheet are respectively provided with a magnetic steel groove, the groove wall of the magnetic steel groove of the first punching sheet is provided with a limiting convex part, the shortest distance between the limiting convex part and the groove wall opposite to the limiting convex part is L, and the width of the magnetic steel groove is W; the permanent magnets are arranged in the magnetic steel grooves, and the thickness of each permanent magnet is T, and L is larger than 0 and smaller than 5 * (W-T). According to the technical scheme provided by the utility model, the permanent magnets can be prevented from vibrating when the rotor rotates, so that the noise level of the motor and the compressor can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, especially rotor, motor and compressor. BACKGROUND

[0002] In modern motor systems, permanent magnet motors are widely used in electric vehicles, industrial drives, aerospace and many other fields due to their high efficiency, energy saving, high power density and many other advantages. The rotor of a permanent magnet motor usually uses a permanent magnet to provide a magnetic field, and the stable installation of the permanent magnet is crucial to the performance and reliability of the motor.

[0003] Currently, in the installation process of the permanent magnet of the permanent magnet motor rotor, common fixing methods include mechanical fixing and adhesive fixing. However, these traditional methods face the risk of permanent magnet vibration during actual operation. SUMMARY

[0004] The main purpose of the utility model is to provide a rotor, motor and compressor, which aims to solve the problem of permanent magnet vibration.

[0005] To achieve the above-mentioned purpose, the rotor provided by the utility model comprises:

[0006] A rotor core, the rotor core comprises a core body, the core body comprises at least one first punching sheet and a plurality of second punching sheets stacked in an axial direction, the first punching sheet and the second punching sheet are each provided with a magnetic steel slot, a limiting protrusion is arranged on the slot wall of the magnetic steel slot of the first punching sheet, the shortest distance from the limiting protrusion to the slot wall opposite to the limiting protrusion is L, and the width of the magnetic steel slot is W; and

[0007] A permanent magnet, the permanent magnet is arranged in the magnetic steel slot, the thickness of the permanent magnet is T, and the following condition is met: 0

[0008] In an embodiment, the difference between W and T satisfies: 0

[0009] In an embodiment, the rotor core further comprises a third punching sheet located at one end of the core body, the third punching sheet is provided with a limiting slot corresponding to the magnetic steel slot, a limiting rib is arranged between two slot walls of the limiting slot arranged opposite in the width direction, and the limiting rib is used to limit the end of the permanent magnet.

[0010] In an embodiment, the width of the limiting rib is d1, the width of the permanent magnet is d2, and d1 and d2 satisfy: d1

[0011] In an embodiment, the width d1 of the limiting rib satisfies: 0.15mm

[0012] In an embodiment, the third punching sheet is located within the first 15 punching sheets from the end of the rotor core inward.

[0013] In an embodiment, the first punching sheet is located between a plurality of the second punching sheets.

[0014] In an embodiment, the rotor core has a height t, the total stack thickness of the third type of punching sheet is t1, and 0 < t1 < 0.2t.

[0015] In an embodiment, the rotor core has a height t, the total stack thickness of the first punching sheet is t2, and 0 < t2 < 0.2t.

[0016] In an embodiment, the magnetic steel slot has a shape of a straight line, a V shape, or a U shape.

[0017] The utility model also provides a motor which comprises the rotor.

[0018] The utility model also provides a compressor which comprises the motor.

[0019] The technical scheme of the utility model sets a limiting protrusion on the slot wall of the magnetic steel slot of the first punching sheet, so that the limiting protrusion can press against the permanent magnet, thereby limiting the displacement of the permanent magnet, preventing the permanent magnet from vibrating when the rotor rotates, and further improving the noise level of the motor and the compressor. Secondly, the shortest distance L from the limiting protrusion to the slot wall opposite to the limiting protrusion is limited to between 0 and 5x(W-T), so that the limiting protrusion can press against the permanent magnet, preventing the permanent magnet from vibrating when the rotor rotates, while avoiding the limiting protrusion from occupying too much width space of the magnetic steel slot, avoiding the limiting protrusion from interfering with the insertion of the permanent magnet into the magnetic steel slot, and further making the installation of the permanent magnet more efficient and labor-saving. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings from the structures shown in the drawings without creative labor.

[0021] Figure 1 The structure schematic view of the first embodiment of the rotor provided by the utility model is shown in the figure.

[0022] Figure 2 The structure schematic view of the first embodiment of the rotor provided by the utility model is shown in the figure. Figure 1 The local enlarged view of A in the figure.

[0023] Figure 3 The structure schematic view of the first embodiment of the rotor provided by the utility model is shown in the figure. Figure 1A partial structure schematic view of a first punching sheet of the rotor provided by the utility model;

[0024] Figure 4 For Figure 1 A partial structure schematic view of a second punching sheet of the rotor provided by the utility model;

[0025] Figure 5 A structure schematic view of a second embodiment of the rotor provided by the utility model;

[0026] Figure 6 For Figure 5 A partial structure schematic view of a third punching sheet of the rotor provided by the utility model;

[0027] Figure 7 For Figure 5 An axial layering schematic view of a rotor core of the rotor provided by the utility model;

[0028] Figure 8 A structure schematic view of a third embodiment of the rotor provided by the utility model;

[0029] Figure 9 A relationship schematic view between a magnetic flux leakage rate of a motor using the rotor provided by the utility model and d1.

[0030] Explanation of the reference signs:

[0031] 100, rotor core; 110, core body; 111, first punching sheet; 112, second punching sheet; 113, magnetic steel slot; 114, limiting convex part; 120, third punching sheet; 121, limiting slot; 122, limiting rib; 200, permanent magnet.

[0032] The implementation, functional features and advantages of the utility model will be further described in combination with the embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0034] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0035] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0036] In modern motor systems, permanent magnet motor is widely used in electric vehicles, industrial drives, aerospace and many other fields due to its high efficiency, energy saving, large power density and many other advantages. The rotor of the permanent magnet motor usually uses permanent magnets to provide a magnetic field, and the stable installation of the permanent magnet is crucial to the performance and reliability of the motor.

[0037] At present, in the installation process of the permanent magnet of the permanent magnet motor rotor, the common fixing methods are mechanical fixing and bonding fixing. However, these traditional methods face the risk of permanent magnet fluttering in the actual operation process.

[0038] In order to solve the problem of permanent magnet fluttering when the rotor rotates, the utility model provides a rotor.

[0039] Please refer to Figures 1 to 4 In an embodiment of the utility model, the rotor includes a rotor core 100 and a permanent magnet 200, the rotor core 100 includes a core body 110, the core body 110 includes at least one first punching sheet 111 and a plurality of second punching sheets 112 stacked in the axial direction, the first punching sheet 111 and the second punching sheet 112 are both provided with a magnetic steel groove 113, the groove wall of the magnetic steel groove 113 of the first punching sheet 111 is provided with a limiting convex part 114, the shortest distance from the limiting convex part 114 to the groove wall opposite to the limiting convex part 114 is L, and the width of the magnetic steel groove 113 is W. The permanent magnet 200 is arranged in the magnetic steel groove 113, the thickness of the permanent magnet 200 is T, and 0 < L < 5 x (W-T) is satisfied.

[0040] The technical scheme of the utility model discloses a limiting convex part 114 is arranged on the groove wall of the magnetic steel groove 113 of the first punching piece 111, so that the limiting convex part 114 can press against the permanent magnet 200, thereby limiting the displacement of the permanent magnet 200, preventing the permanent magnet 200 from vibrating when the rotor rotates, and further improving the noise level of the motor and the compressor.Secondly, the shortest distance L between the limiting convex part 114 and the groove wall opposite to the limiting convex part 114 is limited to 0-5x (W-T), so that the limiting convex part 114 can press against the permanent magnet 200, preventing the permanent magnet 200 from vibrating when the rotor rotates, while avoiding the limiting convex part 114 from occupying too much width space of the magnetic steel groove 113, avoiding the limiting convex part 114 from interfering with the insertion of the permanent magnet 200 into the magnetic steel groove 113, and further making the installation of the permanent magnet 200 more efficient and labor-saving.

[0041] It should be noted that the most protruding point of the limiting convex part 114 is the first starting point, a vertical line is drawn through the first starting point and the groove wall opposite to the limiting convex part 114, the intersection point of the vertical line and the groove wall opposite to the limiting convex part 114 is the first end point, and L represents the distance between the first starting point and the first end point.

[0042] The magnetic steel groove 113 has a first groove side and a second groove side oppositely arranged along the width direction of the magnetic steel groove 113, W represents the vertical distance between the first groove side and the second groove side, that is, the center point of the first groove side is the second starting point, the center point is the intersection point of the four corner diagonals of the first groove side, a vertical line is drawn through the second starting point and the second groove side, the intersection point of the vertical line and the second groove side is the second end point, and W represents the distance between the second starting point and the second end point.

[0043] The permanent magnet 200 has a first side and a second side distributed along the thickness direction of the permanent magnet 200, T represents the vertical distance between the first side and the second side, that is, the center point of the first side is the third starting point, the center point is the intersection point of the four corner diagonals of the first side, a vertical line is drawn through the third starting point and the second side, the intersection point of the vertical line and the second side is the third end point, and T represents the distance between the third starting point and the third end point.

[0044] Further, in the embodiment, the difference between W and T satisfies: 0 < W-T < 0.3 mm; it can be understood that 0 < W-T means that there is a gap between the permanent magnet 200 and the magnetic steel slot 113, which facilitates the insertion of the permanent magnet 200 into the magnetic steel slot 113, making the installation of the permanent magnet 200 more efficient and labor-saving. Furthermore, W-T < 0.3 mm, i.e., the gap width between the permanent magnet 200 and the magnetic steel slot 113 is less than 0.3 mm, so that the gap between the permanent magnet 200 and the magnetic steel slot 113 is within a reasonable range, facilitating the insertion of the permanent magnet 200 into the magnetic steel slot 113, while avoiding the gap between the permanent magnet 200 and the magnetic steel slot 113 being too large, thereby avoiding excessive magnetic flux attenuation of the magnetic steel slot 113.

[0045] It should be noted that "at least one" in the present scheme means one or more, i.e., one, two, three, seven or ten. "Multiple" means two or more, i.e., two, seven, eight or ten.

[0046] In the embodiment, the limiting protrusion 114 is arranged on the slot wall of the magnetic steel slot 113 of the first punching sheet 111 in the width direction of the magnetic steel slot 113. Of course, the present scheme is not limited thereto, and in other embodiments, the limiting protrusion 114 can also be arranged on the slot wall of the magnetic steel slot 113 of the first punching sheet 111 in the length direction of the magnetic steel slot 113.

[0047] Further, in the embodiment, the limiting protrusion 114 is arranged on only one of the slot walls of the magnetic steel slot 113 of the first punching sheet 111 in the width direction of the magnetic steel slot 113. In other embodiments, the limiting protrusion 114 can also be arranged on both slot walls of the magnetic steel slot 113 of the first punching sheet 111 in the thickness direction, so that the limiting protrusion 114 can press against the permanent magnet 200 on both sides in the thickness direction of the permanent magnet 200.

[0048] Further, in the embodiment, only one limiting protrusion 114 is arranged on the magnetic steel slot 113 of one first punching sheet 111. Of course, the present scheme is not limited thereto, and multiple limiting protrusions 114, such as two or three limiting protrusions 114, can also be arranged on one magnetic steel slot 113.

[0049] The side wall of the limiting protrusion 114 in the insertion direction is arranged as a guide slope, which can press against the permanent magnet 200 and also guide the insertion of the permanent magnet 200 into the magnetic steel slot 113 of the first punching sheet 111 when the permanent magnet 200 is inserted, making the installation of the permanent magnet 200 more labor-saving.

[0050] Further, in the embodiment, the outer circumferential surface of the limiting protrusion 114 is arc-shaped as a whole, which can press against the permanent magnet 200 and guide the permanent magnet 200 to be inserted into the magnetic steel slot 113 of the first punching sheet 111 when the permanent magnet 200 is inserted, so that the installation of the permanent magnet 200 is more labor-saving. In addition, the outer circumferential surface of the limiting protrusion 114 is smoother, which reduces the wear of the limiting protrusion 114 on the permanent magnet 200. Of course, the scheme is not limited to this, and in other embodiments, the side wall of the limiting protrusion 114 in the insertion direction can be a guide slope or a guide arc, and the side surface in contact with the permanent magnet 200 can be planar.

[0051] With reference to Figure 5 , Figure 6 and Figure 8 Optionally, in the embodiment, the rotor core 100 further comprises a third punching sheet 120 located at one end of the core body 110, the third punching sheet 120 is provided with a limiting slot 121 corresponding to the magnetic steel slot 113, and the limiting slot 121 is provided with a limiting rib 122 between two slot walls oppositely arranged in the width direction, which is used to limit the end of the permanent magnet 200. It can be understood that the limiting rib 122 can limit the axial displacement of the permanent magnet 200, prevent the permanent magnet 200 from flying out of the magnetic steel slot 113 in the axial direction, so that the end plate at both ends of the motor can be removed, the rotor is simpler, and the permanent magnet 200 can be fixed to prevent the permanent magnet 200 from moving in the axial direction, so that the noise of the product is better. Of course, the scheme is not limited to this, and in other embodiments, the third punching sheet 120 can also not be provided.

[0052] Specifically, the third punching sheet 120 is located at the end of the core body 110, and it can be understood that in the embodiment, the side of the third punching sheet 120 away from the core body 110 is not provided with other punching sheets. Of course, in other embodiments, the side of the third punching sheet 120 away from the core body 110 can also be provided with other punching sheets, for example but not limited to the first punching sheet 111 and / or the second punching sheet 112.

[0053] Further, the width of the limiting rib 122 is d1, and the width of the permanent magnet 200 is d2, and d1 and d2 satisfy: d1 < d2; in this way, the attenuation of the magnetic energy of the permanent magnet 200 can be reduced.

[0054] It should be noted that the limiting rib 122 has a first rib surface and a second rib surface distributed along the width direction of the limiting rib 122, d1 represents the vertical distance from the first rib surface to the second rib surface, that is, the center point of the first rib surface is taken as the fourth starting point, the center point is the intersection point of the four corner diagonals of the first rib surface, a perpendicular line is drawn from the fourth starting point to the second rib surface, and the intersection point of the perpendicular line and the second rib surface is the fourth terminal point, and d1 represents the distance between the fourth starting point and the fourth terminal point.

[0055] The permanent magnet 200 has a third side and a fourth side arranged along the width direction of the permanent magnet 200, and d2 represents the vertical distance from the third side to the fourth side, that is, taking the center point of the third side as a fifth starting point, the center point is the intersection point of the four corner diagonals of the third side, a perpendicular line is drawn from the fifth starting point to the fourth side, and the intersection point of the perpendicular line and the fourth side is a fifth end point, and d2 represents the distance from the fifth starting point to the fifth end point. When the permanent magnet 200 is installed on the rotor core 100, the width direction of the limiting rib 122 is parallel to the width direction of the permanent magnet 200.

[0056] Further, the width d1 of the limiting rib 122 satisfies: 0.15mm < d1 < 5mm; if the width d1 of the limiting rib 122 is less than 0.15mm, the strength of the limiting rib 122 is too small. If the width d1 of the limiting rib 122 is greater than 5mm, the magnetic energy of the permanent magnet 200 will be attenuated too much. The limitation of the width d1 of the limiting rib 122 to 0.15mm to 5mm helps to ensure the strength of the limiting rib 122 while avoiding excessive attenuation of the magnetic energy of the permanent magnet 200.

[0057] Referring to Figure 9 , Figure 9 The schematic diagram of the relationship between the magnetic flux leakage rate of the motor provided with the rotor of the utility model and d1 is shown in FIG. 6, referring to Figure 9 It can be seen that as d1 increases, the magnetic flux leakage rate of the motor increases, when d1 is greater than 5mm, as d1 increases, the magnetic flux leakage rate of the motor increases substantially, and when d1 < 5mm, the magnetic flux leakage rate of the motor is less than 2.5%, thus it can be seen that limiting d1 to be less than 5mm can avoid excessive attenuation of the magnetic energy of the permanent magnet 200.

[0058] Referring to Figure 7 Optionally, the third punching sheet 120 is located in the first 15 punching sheets from the end of the rotor core 100; it should be noted that the third punching sheet 120 is located at the end of the core body 110, but the side of the third punching sheet 120 away from the core body 110 can also be provided with other punching sheets, for example but not limited to the first punching sheet 111 and / or the second punching sheet 112. For the entire rotor core 100, the third punching sheet 120 is located in the first 15 punching sheets from the end of the rotor core 100. Since the punching sheet at the end of the rotor core 100 after the third punching sheet 120 is not provided with a permanent magnet 200, if the position of the third punching sheet 120 exceeds the first 15 punching sheets from the end, it will cause the problem of waste of the rotor core 100, increasing the cost of the product.

[0059] Specifically, the third punching sheet 120 is provided with at least one, in the embodiment, when the third punching sheet 120 is provided with multiple, the multiple third punching sheets 120 are stacked together to form an integral whole. Of course, the multiple third punching sheets 120 can also be stacked with other punching sheets, for example but not limited to the first punching sheet 111 and / or the second punching sheet 112.

[0060] Further, the first punching sheet 111 is arranged between the first sheet and the last sheet in the axial direction of the rotor core 100, so that the middle part of the permanent magnet 200 in the magnetic steel slot 113 is fixed, which is beneficial to further increase the limiting effect of the permanent magnet 200 and reduce the probability of vibration of the permanent magnet 200 during operation.

[0061] Further, the first punching sheet 111 is located between the multiple second punching sheets 112. That is, the first punching sheet 111 is located at the middle position of the core body 110, so that the limiting convex part 114 can limit the middle part of the permanent magnet 200 in the magnetic steel slot 113, which is beneficial to further increase the limiting effect of the permanent magnet 200 and reduce the probability of vibration of the permanent magnet 200 during operation.

[0062] Optionally, in the embodiment, the first punching sheet 111 and the second punching sheet are both provided with multiple, when stacked, the multiple first punching sheets 111 are stacked together to form an integral whole, and then stacked between the multiple punching sheets 112. Of course, the present scheme is not limited to this, in other embodiments, the multiple first punching sheets 111 can also be arranged in other arrangement modes between the multiple second punching sheets 112, for example but not limited to two first punching sheets 111 as a group, the first punching sheet group is provided with multiple groups, and the multiple groups of first punching sheet groups are arranged between the second punching sheets 112.

[0063] Further, the height of the rotor core 100 is t, the total stacking thickness of the third type of punching sheet is t1, and 0 < t1 < 0.2t; it can be understood that too many third punching sheets 120 will cause attenuation and leakage of magnetic flux, resulting in a decrease in motor efficiency; the present scheme limits the total stacking thickness of the third punching sheet 120 to less than 0.2t, which can reduce the attenuation and leakage of magnetic flux, thereby improving the motor efficiency.

[0064] It should be noted that t represents the vertical distance of the two end faces in the axial direction of the rotor core 100, that is, the center of the circle of one end face of the rotor core 100 is the sixth starting point, and the center of the circle of the other end face is the sixth terminal point, and t represents the distance between the sixth starting point and the sixth terminal point. t1 represents the total stacking height in the axial direction of the third punching sheet 120, specifically, when the third punching sheet 120 is provided with a plurality of third punching sheets 120, the total stacking height t1 of the plurality of third punching sheets 120 is represented by the straight line distance between the centers of the two end faces of the two third punching sheets 120 located at the ends and facing away from each other. When the third punching sheet 120 is provided with only one third punching sheet 120, t1 represents the straight line distance between the centers of the two end faces of the third punching sheet 120 distributed in the axial direction.

[0065] In an embodiment, the height of the rotor core 100 is t, the total stacking thickness of the first punching sheet 111 is t2, and 0 < t2 < 0.2t; it can be understood that the axial thickness of the first punching sheet 111 cannot be too much, and too much will bring adverse effects to manufacturing, such as increase of manufacturing process steps, leading to difficulty in insertion and slow manufacturing rhythm; the total stacking thickness t2 of the first punching sheet 111 is limited to less than 0.2t, which can ensure the manufacturing rhythm while increasing the limiting effect of the permanent magnet 200, thereby reducing the noise of the motor and the compressor.

[0066] It should be noted that t2 represents the total stacking height in the axial direction of the first punching sheet 111, specifically, when the first punching sheet 111 is provided with a plurality of first punching sheets 111, the total stacking height t2 of the plurality of first punching sheets 111 is represented by the straight line distance between the centers of the two end faces of the two first punching sheets 111 located at the ends and facing away from each other. When the first punching sheet 111 is provided with only one first punching sheet 111, t2 represents the straight line distance between the centers of the two end faces of the first punching sheet 111 distributed in the axial direction.

[0067] Referring to Figure 1 In an embodiment, the shape of the magnetic steel slot 113 is a linear shape, a V shape or a U shape; it can be understood that the shape of the magnetic steel slot 113 can be a linear shape or other shapes composed of a linear shape; for example but not limited to a linear shape composed of a V shape or a U shape, etc.

[0068] In this embodiment, the shape of the magnetic steel slot 113 is a V-shaped magnetic steel slot 113, which can effectively improve the power density of the motor, optimize the magnetic field distribution, and make the motor output higher power under the same volume. The V-shaped design can also reduce the leakage of the magnetic field, improve the efficiency of the motor, and reduce energy loss. The V-shaped magnetic steel slot 113 also helps to enhance the torque characteristics of the motor, improve the starting torque and overload capacity of the motor.

[0069] In the second embodiment, the magnetic steel slot 113 is in the shape of a straight line due to the simple structure of such a magnetic steel slot 113: the design of the straight-line magnetic steel slot 113 is simple and direct, easy to process and manufacture, and can reduce production costs and production cycles. Moreover, the straight-line magnetic steel slot 113 has good fixation: the straight-line magnetic steel slot 113 can provide better fixation, protect the permanent magnet 200 from collision, and effectively resist centrifugal force, improving the stability of the permanent magnet 200. The shape of the magnetic steel slot 113 is conducive to heat dissipation, which can improve the heat dissipation efficiency of the permanent magnet 200 and prevent the permanent magnet 200 from being damaged due to overheating.

[0070] In the third embodiment, the magnetic steel slot 113 is in the shape of a U-shaped magnetic steel slot 113, which is due to the fact that the U-shaped slot design can effectively reduce magnetic flux leakage and improve the efficiency and power factor of the motor. The U-shaped magnetic steel slot 113 has a compact structure and is suitable for applications where space is limited, which can improve the performance of the motor without increasing the size of the motor.

[0071] The utility model also proposes a motor, the motor includes the rotor, the specific structure of the rotor refers to the above embodiment, because the motor adopts all the technical schemes of the above all embodiments, therefore at least has all beneficial effects brought by the technical scheme of the above embodiment, here will not repeat one by one.

[0072] The utility model also proposes a compressor, the compressor includes the motor, the specific structure of the motor refers to the above embodiment, because the compressor adopts all the technical schemes of the above all embodiments, therefore at least has all beneficial effects brought by the technical scheme of the above embodiment, here will not repeat one by one.

[0073] The above is only an exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by the utility model specification and the attached drawings, or direct / indirect application in other related technical fields under the technical concept of the utility model is included in the patent protection range of the utility model.

Claims

1. A rotor characterized by, The rotor core comprises a core body, the core body comprising at least one first lamination and a plurality of second laminations stacked in an axial direction, the first and second laminations each being provided with a magnet slot, a slot wall of the magnet slot of the first lamination being provided with a limiting protrusion, a shortest distance from the limiting protrusion to a slot wall opposite to the limiting protrusion being L, and a width of the magnet slot being W. The permanent magnet is arranged in the magnet slot, and a thickness of the permanent magnet is T, satisfying 0 A difference between the W and the T satisfies 0 The rotor core further comprises a third lamination at one end of the core body, the third lamination being provided with a limiting slot corresponding to the magnet slot, and a limiting rib being arranged between two slot walls opposite to each other in a width direction of the limiting slot, the limiting rib being used to limit an end of the permanent magnet.

2. The rotor of claim 1, wherein A width of the limiting rib is d1, and a width of the permanent magnet is d2, the d1 and the d2 satisfying d1 3. The rotor of claim 1, wherein The width d1 of the limiting rib satisfies 0.15mm 4. The rotor of claim 3, wherein The third lamination is located within the first 15 laminations from the end of the rotor core inward.

5. The rotor of claim 4, wherein The first lamination is located between the plurality of second laminations.

6. The rotor of claim 3 wherein, A height of the rotor core is t, a total stacking thickness of the third lamination is t1, and 0 7. The rotor of claim 3 wherein, A height of the rotor core is t, a total stacking thickness of the first lamination is t2, and 0 8. The rotor of claim 3, wherein A shape of the magnet slot is in a linear type, a V type, or a U type.

9. A rotor as claimed in any one of claims 1 to 8, characterised in that The rotor comprises any one of the rotor as claimed in claims 1 to 10.

10. A rotor as claimed in any one of claims 1 to 8, characterised in that The motor comprises the rotor as claimed in claim 11.

11. An electric machine characterized by ​ 12. A compressor characterized by, ​

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