Permanent magnet synchronous motor rotor and compressor having the same

Abstract

The present invention provides a permanent magnet synchronous motor rotor and a compressor having the same. The permanent magnet synchronous motor rotor includes: a rotor body, a plurality of permanent magnet slots are circumferentially formed in the rotor body, and a magnetic pole center line is provided between adjacent permanent magnet slots; a permanent magnet, the permanent magnet is disposed in the permanent magnet slot, the first end of the permanent magnet is disposed toward the side of the shaft hole of the rotor body, the second end of the permanent magnet extends toward the outer edge of the rotor body, the thickness of the first end of the permanent magnet along the circumference of the rotor body is H1, and at the midpoint of the end of the first end of the permanent magnet, the length extending along the circumference of the rotor body to the adjacent magnetic pole center line is L1. Wherein, such a setting can reasonably arrange the positional relationship between the permanent magnet and the magnetic pole center line of the rotor core. By adopting the permanent magnet synchronous motor rotor structure with this structure, the torque of the motor having this rotor structure can be effectively improved, the motor efficiency can be improved, the cost performance of the motor can be improved, and the demagnetization resistance of the motor can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressor equipment, and in particular, to a permanent magnet synchronous motor rotor and a compressor having the same. Background Art

[0002] The tangential permanent magnet synchronous motor has a "magnetic concentration" effect. By using permanent magnets with low remanence, a large air-gap magnetic density can also be obtained, enabling the motor to have a large torque-to-current ratio and torque-to-volume ratio, and is increasingly applied to servo systems, electric traction, office automation, household appliances and other occasions.

[0003] Since the tangential permanent magnet synchronous motor provides air-gap magnetic flux on both sides of a single permanent magnet simultaneously and the magnetic circuit is a parallel structure, the operating point of the rotor permanent magnet is lower than that of the radial permanent magnet synchronous motor, which easily causes a decrease in the efficiency of the tangential permanent magnet synchronous motor. Moreover, in a harsh environment, there is a risk of demagnetization in the tangential permanent magnet synchronous motor, making the tangential permanent magnet synchronous motor unable to operate. For the tangential permanent magnet motors adopted in the prior art, although the demagnetization resistance of the motor can be improved, the motor efficiency and demagnetization resistance are still low. Summary of the Invention

[0004] The main object of the present invention is to provide a permanent magnet synchronous motor rotor and a compressor having the same, so as to solve the problem of low motor efficiency in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided a permanent magnet synchronous motor rotor, including: a rotor body, on the circumferential direction of which a plurality of permanent magnet slots are provided, and a magnetic pole center line is provided between adjacent permanent magnet slots; a permanent magnet, which is arranged in the permanent magnet slot, the first end of the permanent magnet is arranged towards the side of the shaft hole of the rotor body, the second end of the permanent magnet extends towards the outer edge of the rotor body, the thickness of the first end of the permanent magnet along the circumferential direction of the rotor body is H1, and at the midpoint of the end of the first end of the permanent magnet, the length extending along the circumferential direction of the rotor body to the adjacent magnetic pole center line is L1, where,

[0006] Further, the thickness of the second end of the permanent magnet along the circumferential direction of the rotor body is H2, and at the midpoint of the end of the second end of the permanent magnet, the length extending along the circumferential direction of the rotor body to the adjacent magnetic pole center line is L2, where,

[0007] Further, the radius of the rotor body is Rr, and the length of the permanent magnet along the radial direction of the rotor body is L3, where 0.45*Rr ≤ L3 ≤ 0.7*Rr.

[0008] Further, the thickness of the permanent magnet gradually increases from the first end to the second end.

[0009] Further, the permanent magnet includes a plurality of constituent segments, which are arranged in sequence along the radial direction of the rotor body, and the thickness of at least one of the plurality of constituent segments is different from the thickness of the remaining constituent segments.

[0010] Further, the plurality of constituent segments include: a first constituent segment disposed closer to the shaft hole side; a second constituent segment located outside the first constituent segment.

[0011] Further, the thickness of one end of the first constituent segment facing the shaft hole is greater than the thickness of the end of the first constituent segment away from the shaft hole, and the thickness of one end of the second constituent segment facing the shaft hole is less than the thickness of the end of the second constituent segment away from the shaft hole.

[0012] Further, the thickness of the end of the first constituent segment away from the shaft hole is C, and the thickness of the end of the first constituent segment facing the shaft hole is H1, where 0.7*H1 ≤ C ≤ 0.95*H1, and / or the length of the first constituent segment along the radial direction of the rotor body is D, and the total length of the first constituent segment and the second constituent segment along the radial direction of the rotor body is L3, where 0.2*L3 ≤ D ≤ 0.6L3.

[0013] Further, the thickness of one end of the second constituent segment facing the shaft hole is greater than or equal to the thickness of the end of the first constituent segment away from the shaft hole.

[0014] Further, the thickness of the end of the first constituent segment facing the shaft hole is less than the thickness of the end of the first constituent segment away from the shaft hole, and the thickness of one end of the second constituent segment facing the shaft hole is less than or equal to the thickness of the end of the second constituent segment away from the shaft hole.

[0015] Further, the thickness of the end of the first constituent segment away from the shaft hole is E, and the thickness of the end of the second constituent segment facing the shaft hole is F, where 1.35 ≥ E / F ≥ 1.2.

[0016] Further, the plurality of constituent segments further include: a third constituent segment located outside the second constituent segment, the thickness of the end of the first constituent segment facing the shaft hole is less than the thickness of the end of the first constituent segment away from the shaft hole, the thickness of one end of the second constituent segment facing the shaft hole is the same as the thickness of the end of the second constituent segment away from the shaft hole, and the thickness of one end of the third constituent segment facing the shaft hole is less than the thickness of the end of the third constituent segment away from the shaft hole.

[0017] Further, the thickness of the end of the first constituent segment facing the shaft hole is H1, and the thickness of the second constituent segment is G, where 1.2 ≥ G / H1 ≥ 1.

[0018] Further, the long side direction of the first set of segments has a first side wall and a second side wall disposed opposite to the first side wall. The long side direction of the second set of segments has a third side wall and a fourth side wall disposed opposite to the third side wall. The third side wall and the first set of segments are on the same side, the second side wall and the fourth side wall are on the same side, and the extension line of the third side wall and the first side wall, and the extension line of the first end of the first set of segments enclose two triangles with the same area.

[0019] Further, the long side direction of the first set of segments has a first side wall and a second side wall disposed opposite to the first side wall. The long side direction of the third set of segments has a fifth side wall and a sixth side wall disposed opposite to the fifth side wall. The fifth side wall and the first side wall are on the same side, the sixth side wall and the second side wall are on the same side, the extension line of the fifth side wall is connected to the end of the first end of the first set of segments, the extension line of the fifth side wall and the first side wall, and the extension line of the end of the second end of the first set of segments enclose a first triangle, and the extension line of the fifth side wall and the side wall of the second set of segments, and the end of the first end of the third set of segments enclose a second triangle. The area of the first triangle is the same as the area of the second triangle.

[0020] According to another aspect of the present invention, a compressor is provided, including a permanent magnet synchronous motor rotor, and the permanent magnet synchronous motor rotor is the above-mentioned permanent magnet synchronous motor rotor.

[0021] Applying the technical solution of the present invention, such a setting can reasonably arrange the positional relationship between the permanent magnet and the magnetic pole center line of the rotor core. With the permanent magnet synchronous motor rotor structure of this structure, the torque of the motor with this rotor structure can be effectively improved, the motor efficiency can be improved, the cost performance of the motor can be improved, and the demagnetization resistance of the motor can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0023] Figure 1 Shows a schematic structural diagram of a first embodiment of a permanent magnet synchronous motor rotor according to the present invention;

[0024] Figure 2 Shows a schematic structural diagram of a second embodiment of a permanent magnet synchronous motor rotor according to the present invention;

[0025] Figure 3 Shows a schematic structural diagram of a third embodiment of a permanent magnet synchronous motor rotor according to the present invention;

[0026] Figure 4 Shows a schematic structural diagram of a fourth embodiment of a permanent magnet synchronous motor rotor according to the present invention;

[0027] Figure 5 Shows a schematic structural diagram of a fifth embodiment of a permanent magnet synchronous motor rotor according to the present invention;

[0028] Figure 6 Shows a schematic structural diagram of a sixth embodiment of a permanent magnet synchronous motor rotor according to the present invention;

[0029] Figure 7 Shows a schematic structural diagram of a seventh embodiment of a permanent magnet synchronous motor rotor according to the present invention;

[0030] Figure 8 Shows a schematic diagram of the relationship between the motor efficiency of the motor according to the present invention and (H1 / 2) / L1;

[0031] Figure 9 Shows a schematic diagram of the relationship between the motor torque of the motor according to the present invention and L3 / Rr;

[0032] Figure 10 Shows a schematic diagram of the relationship between the motor efficiency of the motor according to the present invention and (H2 / 2) / L2;

[0033] Figure 11 Shows a schematic diagram of the demagnetization current improvement effect according to the present invention;

[0034] Figure 12 Shows a schematic structural diagram of an embodiment of the motor according to the present invention.

[0035] Among them, the above-mentioned drawings include the following reference numerals:

[0036] 10. Rotor body; 11. Permanent magnet slot; 12. Shaft hole;

[0037] 20. Permanent magnet;

[0038] 31. First component segment; 311. First side wall; 312. Second side wall;

[0039] 32. Second component segment; 321. Third side wall; 322. Fourth side wall;

[0040] 33. Third component segment; 331. Fifth side wall; 332. Sixth side wall;

[0041] 40. Non-magnetic collar; 50. Stator. Detailed implementation manners

[0042] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0043] It should be noted that the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0045] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and thus their description will be omitted.

[0046] Combined with Figures 1 to 12 As shown, according to an embodiment of the present application, a permanent magnet synchronous motor rotor is provided.

[0047] Specifically, as Figure 1 shown, the permanent magnet synchronous motor rotor includes a rotor body 10 and permanent magnets 20. A plurality of permanent magnet slots 11 are circumferentially formed in the rotor body 10. There is a magnetic pole center line between adjacent permanent magnet slots 11. The permanent magnets 20 are disposed in the permanent magnet slots 11. The first end of the permanent magnet 20 is disposed toward one side of the shaft hole 12 of the rotor body 10, and the second end of the permanent magnet 20 extends toward the outer edge of the rotor body 10. The thickness of the first end of the permanent magnet 20 along the circumference of the rotor body 10 is H1, and the length from the midpoint of the end of the first end of the permanent magnet 20 to the adjacent magnetic pole center line along the circumference of the rotor body 10 is L1, where

[0048] In this embodiment, such a setting can reasonably arrange the positional relationship between the first end of the permanent magnet and the magnetic pole center line Q of the rotor core. With the permanent magnet synchronous motor rotor structure of this structure, the torque of the motor with this rotor structure can be effectively increased, the motor efficiency can be improved, the cost performance of the motor can be improved, and the demagnetization resistance of the motor can be improved.

[0049] Further, the thickness of the second end of the permanent magnet 20 along the circumferential direction of the rotor body 10 is H2, and at the midpoint of the end of the second end of the permanent magnet 20, the length extending along the circumferential direction of the rotor body 10 to the adjacent magnetic pole center line is L2, where such a setting can reasonably arrange the positional relationship between the second end of the permanent magnet and the magnetic pole center line Q of the rotor core. With the permanent magnet synchronous motor rotor structure of this structure, the torque of the motor with this rotor structure can be effectively increased, the motor efficiency can be improved, the cost performance of the motor can be improved, and the demagnetization resistance of the motor can be improved. Among them, the first end of the permanent magnet 20 intersects the magnetic pole center line at point A, and the second end of the permanent magnet 20 intersects the magnetic pole center line at point B, where point B is located at the edge of the rotor body 10. Since in Figure 1 the embodiments shown, the structures of the plurality of permanent magnets 20 are the same and are uniformly arranged in the permanent magnet slots 11 of the rotor body, so the distance from the first end of each permanent magnet 20 to the adjacent magnetic pole center line Q is equal, and the distance from the second end of each permanent magnet 20 to the adjacent magnetic pole center line Q is also equal. Among them, the permanent magnet 20 in this application uses tangential magnetization, that is, the motor with this permanent magnet synchronous motor rotor structure is a tangential permanent magnet synchronous motor.

[0050] In order to further improve the performance of the motor with this rotor structure, the radius of the rotor body 10 is set to Rr, and the length of the permanent magnet 20 in the radial direction of the rotor body 10 is L3, where 0.45*Rr ≤ L3 ≤ 0.7*Rr. In this embodiment, the thickness from the first end to the second end of the permanent magnet 20 is set to gradually increase.

[0051] As Figures 3 to 7 shown, the permanent magnet 20 includes a plurality of component segments, and the plurality of component segments are arranged in sequence in the radial direction of the rotor body 10, and the thickness of at least one of the plurality of component segments is different from the thickness of the remaining component segments. Such a setting can also improve the demagnetization resistance of the motor.

[0052] Specifically, as Figure 3As shown, multiple component segments include a first component segment 31 and a second component segment 32. The first component segment 31 is disposed closer to the side of the shaft hole 12. The second component segment 32 is located outside the first component segment 31. The thickness of the first component segment 31 at the end facing the shaft hole 12 is greater than the thickness of the first component segment 31 at the end away from the shaft hole 12, and the thickness of the second component segment 32 at the end facing the shaft hole 12 is less than the thickness of the second component segment 32 at the end away from the shaft hole 12.

[0053] Preferably, the thickness of the first component segment 31 at the end away from the shaft hole 12 is C, and the thickness of the first component segment 31 at the end facing the shaft hole 12 is H1, where 0.7*H1 ≤ C ≤ 0.95*H1. The length of the first component segment 31 in the radial direction of the rotor body 10 is D, and the total length of the first component segment 31 and the second component segment 32 in the radial direction of the rotor body 10 is L3, where 0.2*L3 ≤ D ≤ 0.6*L3.

[0054] According to another embodiment of the present application, the thickness of the second component segment 32 at the end facing the shaft hole 12 is greater than or equal to the thickness of the first component segment 31 at the end away from the shaft hole 12. As Figure 4 shown, Figure 4 An embodiment is shown in which the thickness of the second component segment 32 at the end facing the shaft hole 12 is equal to the thickness of the first component segment 31 at the end away from the shaft hole 12.

[0055] As Figure 5 shown, in this embodiment, the thickness of the first component segment 31 at the end facing the shaft hole 12 is less than the thickness of the first component segment 31 at the end away from the shaft hole 12, and the thickness of the second component segment 32 at the end facing the shaft hole 12 is less than the thickness of the second component segment 32 at the end away from the shaft hole 12. Among them, preferably, the thickness of the first component segment 31 at the end away from the shaft hole 12 is E, and the thickness of the second component segment 32 at the end facing the shaft hole 12 is F, where 1.35 ≥ E / F ≥ 1.2. Such a setting can effectively improve the performance of the motor. Of course, the second component segment 32 can also be set in an equal-width manner, that is, as Figure 6 shown in the embodiment.

[0056] As Figure 7As shown, the multiple component segments further include a third component segment 33. The third component segment 33 is located outside the second component segment 32. The thickness of one end of the first component segment 31 facing the shaft hole 12 is less than the thickness of the other end of the first component segment 31 away from the shaft hole 12. The thickness of one end of the second component segment 32 facing the shaft hole 12 is the same as the thickness of the other end of the second component segment 32 away from the shaft hole 12. The thickness of one end of the third component segment 33 facing the shaft hole 12 is less than the thickness of the other end of the third component segment 33 away from the shaft hole 12. Among them, the thickness of one end of the first component segment 31 facing the shaft hole 12 is H1, and the thickness of the second component segment 32 is G, where 1.2 ≥ G / H1 ≥ 1.

[0057] As Figure 3 shown, the long side direction of the first component segment 31 has a first side wall 311 and a second side wall 312 disposed opposite to the first side wall 311. The long side direction of the second component segment 32 has a third side wall 321 and a fourth side wall 322 disposed opposite to the third side wall 321. The third side wall 321 and the first component segment 31 are on the same side. The second side wall 312 and the fourth side wall 322 are on the same side. The extension line of the third side wall 321 and the first side wall 311, and the extension lines of the first end of the first component segment 31 and the first end of the first component segment 31 enclose two triangles with the same area, that is, S1 and S2 shown in the figure.

[0058] According to another embodiment of the present application, the long side direction of the first component segment 31 has a first side wall 311 and a second side wall 312 disposed opposite to the first side wall 311. The long side direction of the third component segment 33 has a fifth side wall 331 and a sixth side wall 332 disposed opposite to the fifth side wall 331. The fifth side wall 331 and the first side wall 311 are on the same side. The sixth side wall 332 and the second side wall 312 are on the same side. The extension line of the fifth side wall 331 is connected to the end of the first end of the first component segment 31. The extension line of the fifth side wall 331 and the first side wall 311, and the extension line of the end of the second end of the first component segment 31 enclose a first triangle S3. The extension line of the fifth side wall 331 and the side wall of the second component segment 32, and the end of the first end of the third component segment 33 enclose a second triangle S4. The area of the first triangle S3 is the same as the area of the second triangle S4.

[0059] The permanent magnet synchronous motor rotor in the above embodiments can also be used in the technical field of motor equipment. That is, according to another aspect of the present invention, a compressor is provided, including a permanent magnet synchronous motor rotor, and the permanent magnet synchronous motor rotor is the permanent magnet synchronous motor rotor in the above embodiments.

[0060] Specifically, the present application provides a permanent magnet synchronous motor rotor. The permanent magnets are evenly distributed on the rotor and include N permanent magnets arranged in the radial direction of the rotor. The permanent magnets are tangentially magnetized. N is an even number greater than or equal to 4, and two adjacent permanent magnets are arranged with the same polarities facing each other. Since the tangential permanent magnet synchronous motor provides air-gap magnetic flux on both sides of a single permanent magnet simultaneously and the magnetic circuit is a parallel structure, the operating point of the rotor permanent magnets is lower than that of the radial permanent magnet synchronous motor, which easily causes a decrease in the efficiency of the tangential permanent magnet synchronous motor. Moreover, there is a risk of demagnetization in the tangential permanent magnet synchronous motor under harsh environments, making the tangential permanent magnet synchronous motor unable to operate. It is found that when the inner thickness of the permanent magnet of the tangential permanent magnet synchronous motor increases, the motor torque increases and the motor efficiency increases. However, when the thickness increases to a certain extent, the efficiency no longer increases, and with the increase of the inner thickness, the amount of permanent magnets used increases and the cost increases, which will reduce the cost performance of the motor. The position close to the shaft is the inner side of the permanent magnet, and the position close to the outer diameter of the rotor is the inner side of the permanent magnet. The permanent magnet has a certain thickness in the circumferential direction of the rotor. The inner thickness of the permanent magnet is set as H_inner. Extend the inner edge line of the permanent magnet to the magnetic pole center line, and the intersection point is A. The distance between the midpoint of the inner edge line and A is set as L1. When H1 and L1 satisfy the following relationship: it can increase the motor torque, increase the motor efficiency, increase the cost performance of the motor, and at the same time, with the increase of the inner thickness, the demagnetization resistance of the motor increases.

[0061] The length of the permanent magnet in the radial direction of the rotor is set as L3, and the radius of the rotor is set as Rr. L3 and Rr should satisfy the following relationship: 0.45*Rr ≤ L3 ≤ 0.7*Rr. Under a certain preset outer diameter of the rotor, when the length of the permanent magnet in the radial direction increases towards the inner side of the rotor, the cross-section providing effective magnetic flux increases and the magnetic chain of the motor increases. However, when the length of the permanent magnet towards the inner side increases, the layout space of the inner magnetic isolation structure will be reduced. The magnetic isolation structure can be a magnetic isolation bridge or a non-magnetic conducting sleeve ring, which makes the magnetic isolation bridge shorter or the radial length of the non-magnetic conducting sleeve ring shorter, increasing the inner leakage magnetic flux and decreasing the magnetic chain of the motor. Therefore, when L3 and Rr satisfy the following relationship: 0.45*Rr ≤ L3 ≤ 0.7*Rr, the magnetic chain of the motor is the highest, the torque of the motor is the largest, the efficiency of the motor is the best, and the cost performance of the motor is the best.

[0062] The outer side of the permanent magnet has a certain thickness in the circumferential direction of the rotor. The outer thickness of the permanent magnet is set as H2. Extend the outer edge line of the permanent magnet to the magnetic pole center line, and the intersection point is B. The distance between the midpoint of the outer edge line and B is set as L2. H2 and L2 should satisfy the following relationship: When the outer thickness of the permanent magnet increases, the magnetic chain of the motor increases, the torque of the motor increases, and the demagnetization resistance of the motor increases. However, when H2 / 2 > 0.5*L2, the magnetic conducting area of the rotor magnetic pole decreases, the magnetic chain of the motor decreases, the torque of the motor decreases, and the efficiency of the motor decreases. Therefore, when the efficiency of the motor is the best and the cost performance of the motor is the best.

[0063] The thickness of the permanent magnet is set to be unequal in the radial direction of the rotor. The thickness of each section of the magnet steel is unequal in the radial direction, with at least two sections. For example, the permanent magnet is set to two sections in the radial direction of the rotor. The first section is thinner on the outside and thicker on the inside, and the second section is thicker on the outside and thinner on the inside. The outer thickness of the first section is less than the inner thickness of the second section. The outer thickness of the first section is set to C, and the inner thickness of the permanent magnet is set to H1. When C and H1 satisfy the following relationship: 0.7*H1 ≤ C ≤ 0.95*H1, since the inner corner part of the permanent magnet is prone to demagnetization, the inner thickness of the permanent magnet is further increased to improve the working point of the inner part of the permanent magnet and enhance the anti-demagnetization ability of the motor. At the same time, the removed permanent magnet area S1 is equal to the added permanent magnet area S2, which can ensure that the anti-demagnetization ability of the motor is improved and the reliability of the motor is enhanced under the condition of the same permanent magnet consumption.

[0064] Furthermore, the length of the first section in the radial direction is set to D, and the length of the permanent magnet in the radial direction of the rotor is set to L3. D and L3 should satisfy the following relationship: 0.2*L3 ≤ D ≤ 0.6*L3. When D < 0.2*L3, the length of the first section is too short, the improvement of the working point of the permanent magnet is small, and the improvement of the anti-demagnetization ability of the motor is small. When D > 0.6*L3, although the anti-demagnetization ability of the permanent magnet in the first section is improved, the length of the second section is too short, which will cause the working point of the second section to drop and the overall anti-demagnetization ability of the motor to decline. Therefore, when 0.2*L3 ≤ D ≤ 0.6*L3, the anti-demagnetization ability of the motor is improved while ensuring the same permanent magnet consumption.

[0065] The permanent magnet is set to two sections in the radial direction of the rotor. The first section is thinner on the outside and thicker on the inside, and the second section is thicker on the outside and thinner on the inside. The outer thickness of the first section is equal to (or greater than) the inner thickness of the second section, which can make the thickness of each part of the permanent magnet in the first section increase along the radial direction, with more increase on the inner side and less increase on the outside. The working point of the inner permanent magnet is further improved, the anti-demagnetization ability of the motor is further enhanced, and at the same time, the magnetic chain of the motor is increased and the motor torque is increased.

[0066] The permanent magnet is set to two sections in the radial direction of the rotor. The first section is thicker on the outside and thinner on the inside, and the second section is thicker on the outside and thinner on the inside. The outer thickness of the first section is greater than the inner thickness of the second section. The outer thickness of the first section is set to E, and the inner thickness of the second section is set to F. E and F should satisfy the following relationship: 1.35 ≥ E / F ≥ 1.2, which can make the thickness of each part of the permanent magnet in the first section increase along the radial direction, with more increase on the outside and less increase on the inside. The working point of the inner permanent magnet is further improved, the anti-demagnetization ability of the motor is further enhanced, and at the same time, the magnetic chain of the motor is increased and the motor torque is increased. However, when E / F > 1.35, the consumption of the permanent magnet is too large, the cost of the motor increases significantly, and the cost performance of the motor decreases. Therefore, E / F should be set within the range of: 1.35 ≥ E / F ≥ 1.2.

[0067] The permanent magnet is arranged in three segments in the radial direction of the rotor. The first segment is thinner on the inner side and thicker on the outer side, the second segment has a uniform thickness, and the third segment is thinner on the inner side and thicker on the outer side. The thickness of the second segment is set as G, and the thickness of the inner side of the first segment is set as H1. The relationship between G and H1 should satisfy the following: 1.2 ≥ G / H1 ≥ 1. The permanent magnet is arranged with unequal thicknesses in the radial direction of the rotor. For the permanent magnet of the tangential motor, the inner and outer sides of the permanent magnet are prone to demagnetization. Therefore, the thickness at the middle position is thinned, and the two sides are thickened to increase the working points of the inner and outer sides of the permanent magnet and improve the anti-demagnetization ability of the motor. When G / H1 < 1, the middle thickness is too thin, the magnetic flux of the motor decreases, and the motor torque decreases. When G / H1 > 1.2, the amount of permanent magnet used increases, the cost of the motor increases, and the cost performance of the motor decreases. When 1.2 ≥ G / H1 ≥ 1, the anti-demagnetization ability of the motor is relatively good, and the cost performance of the motor is relatively good. Among them, the motor also includes a non-magnetic sleeve ring 40 and a stator 50.

[0068] For the sake of easy description, spatial relative terms, such as "above...", "over...", "on the upper surface of...", "above" and the like, can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure of the device. For example, if the device in the attached drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding explanations are made for the spatial relative descriptions used here.

[0069] In addition to the above, it should also be noted that the "one embodiment", "another embodiment", "embodiment" and the like mentioned in this specification refer to the specific features, structures or characteristics described in connection with that embodiment being included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in connection with any one embodiment, it is intended that the implementation of such feature, structure or characteristic in combination with other embodiments also falls within the scope of the present invention.

[0070] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0071] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A permanent magnet synchronous motor rotor, characterized in that, Comprising: A rotor body (10), wherein a plurality of permanent magnet slots (11) are circumferentially formed in the rotor body (10), and a magnetic pole center line is provided between adjacent permanent magnet slots (11); A permanent magnet (20), the permanent magnet (20) is disposed in the permanent magnet groove (11), a first end of the permanent magnet (20) is disposed toward one side of the shaft hole (12) of the rotor body (10), a second end of the permanent magnet (20) extends toward the outer edge of the rotor body (10), a thickness of the first end of the permanent magnet (20) along the circumferential direction of the rotor body (10) is H1, at a midpoint of an end of the first end of the permanent magnet (20), a length extending along the circumferential direction of the rotor body (10) to an adjacent magnetic pole center line is L1, wherein, The permanent magnet (20) includes a plurality of component segments, and the plurality of component segments include: A first component segment (31), a second component segment (32), and a third component segment (33). The third component segment (33) is located outside the second component segment (32). The thickness of one end of the first component segment (31) facing the shaft hole (12) is less than the thickness of the end of the first component segment (31) away from the shaft hole (12). The thickness of one end of the second component segment (32) facing the shaft hole (12) is the same as the thickness of the end of the second component segment (32) away from the shaft hole (12). The thickness of one end of the third component segment (33) facing the shaft hole (12) is less than the thickness of the end of the third component segment (33) away from the shaft hole (12); A non-magnetic conducting collar (40), and a plurality of permanent magnet slots (11) are circumferentially spaced along the non-magnetic conducting collar (40).

2. The permanent magnet synchronous motor rotor according to claim 1, characterized in that, The thickness of the second end of the permanent magnet (20) along the circumferential direction of the rotor body (10) is H2. At the midpoint of the end of the second end of the permanent magnet (20), the length extending along the circumferential direction of the rotor body (10) to the adjacent magnetic pole center line is L2, wherein, 0.35* 3. The permanent magnet synchronous motor rotor according to claim 1 or 2, characterized in that The radius of the rotor body (10) is Rr, and the length of the permanent magnet (20) along the radial direction of the rotor body (10) is L3, wherein, 0.45*Rr ≤ L3 ≤ 0.7*Rr.

4. The permanent magnet synchronous motor rotor according to claim 1, characterized in that The plurality of component segments are sequentially arranged along the radial direction of the rotor body (10), and the thickness of at least one of the plurality of component segments is different from the thickness of the remaining component segments.

5. The permanent magnet synchronous motor rotor according to claim 4, wherein The first component segment (31) is arranged on the side close to the shaft hole (12), and the second component segment (32) is located outside the first component segment (31).

6. The permanent magnet synchronous motor rotor according to claim 5, wherein The thickness of one end of the first component segment (31) facing the shaft hole (12) is H1, and the thickness of the second component segment (32) is G, wherein, 1.2 ≥ G / H1 ≥ 1.

7. The permanent magnet synchronous motor rotor according to claim 1, wherein The long side direction of the first formed segment (31) has a first side wall (311) and a second side wall (312) disposed opposite to the first side wall (311). The long side direction of the third formed segment (33) has a fifth side wall (331) and a sixth side wall (332) disposed opposite to the fifth side wall (331). The fifth side wall (331) and the first side wall (311) are on the same side, and the sixth side wall (332) and the second side wall (312) are on the same side. The extension line of the fifth side wall (331) is connected to the end of the first end of the first formed segment (31). The extension line of the fifth side wall (331), the first side wall (311), and the extension line of the end of the second end of the first formed segment (31) enclose a first triangle. The extension line of the fifth side wall (331), the side wall of the second formed segment (32), and the end of the first end of the third formed segment (33) enclose a second triangle. The area of the first triangle is the same as the area of the second triangle.

8. A permanent magnet synchronous motor rotor, characterized in that, Comprising: A rotor body (10), on the circumference of which a plurality of permanent magnet slots (11) are provided, and there is a magnetic pole center line between adjacent permanent magnet slots (11); A permanent magnet (20), the permanent magnet (20) is disposed in the permanent magnet slot (11), a first end of the permanent magnet (20) is disposed toward one side of the shaft hole (12) of the rotor body (10), a second end of the permanent magnet (20) extends toward the outer edge of the rotor body (10), a thickness of the first end of the permanent magnet (20) along the circumferential direction of the rotor body (10) is H1, at the midpoint of the end of the first end of the permanent magnet (20), a length extending along the circumferential direction of the rotor body (10) to an adjacent magnetic pole center line is L1, wherein, A non-magnetic sleeve ring (40), and a plurality of permanent magnet slots (11) are arranged at intervals along the circumference of the non-magnetic sleeve ring (40).

9. The permanent magnet synchronous motor rotor according to claim 8, characterized in that, The thickness from the first end to the second end of the permanent magnet (20) is set to gradually increase.

10. The permanent magnet synchronous motor rotor according to claim 8, characterized in that, The permanent magnet (20) includes a plurality of formed segments, and the plurality of formed segments are arranged in sequence along the radial direction of the rotor body (10). The thickness of at least one of the plurality of formed segments is different from the thickness of the remaining formed segments.

11. The permanent magnet synchronous motor rotor according to claim 10, wherein, The plurality of formed segments include: A first formed segment (31), which is arranged on the side close to the shaft hole (12); A second formed segment (32), which is located outside the first formed segment (31).

12. The permanent magnet synchronous motor rotor according to claim 11, wherein The thickness of the end of the first formed segment (31) facing the shaft hole (12) is greater than the thickness of the end of the first formed segment (31) away from the shaft hole (12), and the thickness of the end of the second formed segment (32) facing the shaft hole (12) is less than the thickness of the end of the second formed segment (32) away from the shaft hole (12).

13. The permanent magnet synchronous motor rotor according to claim 12, wherein The thickness of the end of the first formed segment (31) away from the shaft hole (12) is C, and the thickness of the end of the first formed segment (31) facing the shaft hole (12) is H1, where 0.7*H1 ≤ C ≤ 0.95*H1, and / or The length of the first formed segment (31) in the radial direction of the rotor body (10) is D, and the total length of the first formed segment (31) and the second formed segment (32) in the radial direction of the rotor body (10) is L3, where 0.2*L3 ≤ D ≤ 0.6*L3.

14. The permanent magnet synchronous motor rotor according to claim 12, wherein, The thickness of the second formed segment (32) at the end facing the shaft hole (12) is greater than or equal to the thickness of the first formed segment (31) at the end away from the shaft hole (12).

15. The permanent magnet synchronous motor rotor according to claim 11, wherein The thickness of the first formed segment (31) at the end facing the shaft hole (12) is less than the thickness of the first formed segment (31) at the end away from the shaft hole (12), and the thickness of the second formed segment (32) at the end facing the shaft hole (12) is less than or equal to the thickness of the second formed segment (32) at the end away from the shaft hole (12).

16. The permanent magnet synchronous motor rotor according to claim 15, wherein The thickness of the first formed segment (31) at the end away from the shaft hole (12) is E, and the thickness of the second formed segment (32) at the end facing the shaft hole (12) is F, where 1.35 ≥ E / F ≥ 1.

2.

17. The permanent magnet synchronous motor rotor according to claim 12, wherein The long side direction of the first formed segment (31) has a first side wall (311) and a second side wall (312) oppositely arranged to the first side wall (311), the long side direction of the second formed segment (32) has a third side wall (321) and a fourth side wall (322) oppositely arranged to the third side wall (321), the third side wall (321) and the first side wall (311) are on the same side, the second side wall (312) and the fourth side wall (322) are on the same side, and the extension line of the third side wall (321) and the extension line of the first side wall (311), the extension line of the first end and the second end of the first formed segment (31) enclose two triangles with the same area.

18. A compressor, including a permanent magnet synchronous motor rotor, characterized in that, The permanent magnet synchronous motor rotor is the permanent magnet synchronous motor rotor according to any one of claims 1 to 17.

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