Rotor punching sheet, motor rotor and permanent magnet synchronous motor

Abstract

The present application relates to a rotor punching sheet, a motor rotor and a permanent magnet synchronous motor, including a punching sheet main body provided with a plurality of magnetic slot units. The magnetic slot units include an inner magnetic slot group and an outer magnetic slot group arranged radially along the punching sheet main body. The inner magnetic slot group includes a first magnetic slot, a second magnetic slot and a third magnetic slot. The first magnetic slot is arranged between the second magnetic slot and the third magnetic slot, and the three form a V-shaped structure layout. The first magnetic slot has a linear structure and is arranged tangentially along the punching sheet main body. The outer magnetic slot group includes a fourth magnetic slot, a fifth magnetic slot and a sixth magnetic slot. The fourth magnetic slot is arranged between the fifth magnetic slot and the sixth magnetic slot, and the three form a V-shaped structure layout. The fourth magnetic slot has a linear structure and is arranged tangentially along the punching sheet main body. Among them, a first magnet is arranged in the first magnetic slot, a second magnet is arranged in the second magnetic slot, a third magnet is arranged in the third magnetic slot, a fourth magnet is arranged in the fourth magnetic slot, a fifth magnet is arranged in the fifth magnetic slot, and a sixth magnet is arranged in the sixth magnetic slot.

Description

Technical Field

[0001] This application relates to the technical field of motors, and particularly to a rotor punching sheet, a motor rotor, and a permanent magnet synchronous motor. Background Art

[0002] With the global emphasis on environmental protection and sustainable development, new energy vehicles, as an efficient and low-carbon means of transportation, are rapidly becoming the mainstream of the automotive industry. As the core power component of new energy vehicles, the performance of motors directly affects the acceleration performance, driving range, and overall energy efficiency of vehicles. In the application scenarios of new energy vehicles, motors need to have high torque output capabilities to meet the power requirements of vehicles under conditions such as acceleration and climbing. At the same time, motors also need to maintain high-efficiency operation within a wide speed regulation range to adapt to various driving conditions such as urban roads and highways. In addition, the volume and weight of motors need to be reduced as much as possible to improve the overall performance and energy efficiency of vehicles. Therefore, the design and optimization of motors have become one of the important directions in the development of new energy vehicle technology.

[0003] Permanent magnet synchronous motors are a relatively common type of motor at present. By embedding permanent magnets inside the rotor, high torque density and good field weakening control capabilities are achieved. However, due to the suboptimal layout structure of magnetic slots and magnets, insufficient magnetic flux utilization often occurs during high torque output, resulting in a reduction in torque density, an increase in torque ripple, and vehicle jitter during low-speed driving, affecting the ride comfort. Summary of the Invention

[0004] Based on this, it is necessary to provide a rotor punching sheet, a motor rotor, and a permanent magnet synchronous motor to address the problems of low torque density affecting motor performance and large torque ripple causing jitter and affecting ride comfort.

[0005] In the first aspect of this application, a rotor punching sheet is proposed, which includes:

[0006] A punching sheet main body, the punching sheet main body is provided with a plurality of magnetic slot units, and the plurality of magnetic slot units are arranged at intervals along the circumferential direction of the punching sheet main body. The magnetic slot unit includes an inner magnetic slot group and an outer magnetic slot group arranged radially along the punching sheet main body. The inner magnetic slot group includes a first magnetic slot, a second magnetic slot, and a third magnetic slot. The first magnetic slot is disposed between the second magnetic slot and the third magnetic slot, and the three form a V-shaped structure layout. The first magnetic slot has a linear structure and is arranged tangentially along the punching sheet main body; the outer magnetic slot group includes a fourth magnetic slot, a fifth magnetic slot, and a sixth magnetic slot. The fourth magnetic slot is disposed between the fifth magnetic slot and the sixth magnetic slot, and the three form a V-shaped structure layout. The fourth magnetic slot has a linear structure and is arranged tangentially along the punching sheet main body;

[0007] Wherein, a first magnet is disposed in the first magnetic slot, a second magnet is disposed in the second magnetic slot, a third magnet is disposed in the third magnetic slot, a fourth magnet is disposed in the fourth magnetic slot, a fifth magnet is disposed in the fifth magnetic slot, and a sixth magnet is disposed in the sixth magnetic slot;

[0008] A first magnetic isolation bridge is disposed between the inner magnetic slot group and the outer magnetic slot group, and second magnetic isolation bridges are disposed between the first magnetic slot and the second magnetic slot, between the first magnetic slot and the third magnetic slot, between the fourth magnetic slot and the fifth magnetic slot, and between the fourth magnetic slot and the sixth magnetic slot.

[0009] In this solution, a plurality of magnetic slot units are arranged at intervals in the circumferential direction of the punching sheet body. Each magnetic slot unit is composed of an inner magnetic slot group and an outer magnetic slot group. The inner magnetic slot group is composed of a first magnetic slot, a second magnetic slot, and a third magnetic slot arranged in a V-shaped structure, and the outer magnetic slot group is composed of a fourth magnetic slot, a fifth magnetic slot, and a sixth magnetic slot arranged in a V-shaped structure. At the same time, both the first magnetic slot and the fourth magnetic slot are arranged in a linear structure along the tangent direction of the punching sheet body. On this basis, when the first magnet, the second magnet, the third magnet, the fourth magnet, the fifth magnet, and the sixth magnet are respectively installed in their corresponding magnetic slots, the tangentially arranged first magnet and fourth magnet can effectively gather magnetic flux, increase magnetic density, thereby enhancing the output torque of the motor, and the magnetic field synergy of the first magnet and the fourth magnet arranged in an inner-outer cooperation further increases the magnetic density and improves the torque density; while the two groups of magnets arranged in a V-shaped structure (the second magnet and the third magnet are one group, and the fifth magnet and the sixth magnet are the other group) can increase the reluctance torque, reduce the torque ripple, avoid the vehicle from jittering when driving at low speed, and improve the driving comfort; further, setting the inner and outer two-layer arrangement structure can maximize the magnetic flux, output the maximum torque, and improve the torque density.

[0010] The technical solution of the present application will be further described below:

[0011] In one embodiment, the second magnetic slot and the third magnetic slot are symmetrically arranged along the radial center line of the first magnetic slot, the fifth magnetic slot and the sixth magnetic slot are symmetrically arranged along the radial center line of the fourth magnetic slot, and the radial center lines of the first magnetic slot and the fourth magnetic slot are collinear with the symmetry center line of the V-shaped structure; wherein, the angular range of the V-shaped structure is: 115° to 125°.

[0012] In one embodiment, the second magnet and the third magnet have the same size, and the sizes of the second magnet and the third magnet are both smaller than the size of the first magnet;

[0013] The fifth magnet and the sixth magnet have the same size, and the sizes of the fifth magnet and the sixth magnet are both smaller than the size of the fourth magnet.

[0014] In one embodiment, two first air-gap structures are formed on opposite sides of the first magnet in the first magnetic groove, two second air-gap structures are formed on opposite sides of the fourth magnet in the fourth magnetic groove, third air-gap structures are formed on the side of the second magnetic groove and the third magnetic groove close to the first magnetic groove, fourth air-gap structures are formed on the side of the second magnetic groove and the third magnetic groove away from the first magnetic groove, fifth air-gap structures are formed on the side of the fifth magnetic groove and the sixth magnetic groove close to the fourth magnetic groove, and sixth air-gap structures are formed on the side of the fifth magnetic groove and the sixth magnetic groove away from the fourth magnetic groove;

[0015] Among them, the third air-gap structure and the fifth air-gap structure have the same shape, and the fourth air-gap structure and the sixth air-gap structure have different shapes.

[0016] In one embodiment, the first magnetic groove includes a first straight side, a second straight side, a third straight side, a fourth straight side, a fifth straight side, and a sixth straight side, and the fourth magnetic groove includes a seventh straight side, an eighth straight side, a ninth straight side, a tenth straight side, an eleventh straight side, and a twelfth straight side;

[0017] Both the first magnetic groove and the fourth magnetic groove are isosceles trapezoids. The first straight side, the fourth straight side, the seventh straight side, and the tenth straight side are parallel to each other. The third straight side, the fourth straight side, and the fifth straight side are collinear. The ninth straight side, the tenth straight side, and the eleventh straight side are collinear. The second straight side and the sixth straight side have the same length. The eighth straight side and the twelfth straight side have the same length. The second straight side is parallel to the eighth straight side, and the sixth straight side is parallel to the twelfth straight side.

[0018] In one embodiment, both the second magnetic groove and the third magnetic groove include a thirteenth straight side, a fourteenth straight side, a fifteenth straight side, a sixteenth straight side, a seventeenth straight side, an eighteenth straight side, and a nineteenth straight side;

[0019] Both the fifth magnetic groove and the sixth magnetic groove include a twentieth straight side, a twenty-first straight side, a twenty-second straight side, a twenty-third straight side, a twenty-fourth straight side, and a twenty-fifth straight side;

[0020] The thirteenth straight side, the seventeenth straight side, the twentieth straight side, and the twenty-third straight side are parallel to each other. The sixteenth straight side, the seventeenth straight side, and the eighteenth straight side are collinear. The twenty-third straight side and the twenty-fourth straight side are collinear. The nineteenth straight side and the twenty-fifth straight side are collinear.

[0021] In one embodiment, the fourth air-gap structure is formed by enclosing with the thirteenth straight edge, the first arc, the fourteenth straight edge, the second arc, the fifteenth straight edge, the third arc and the sixteenth straight edge; the included angle formed by the thirteenth straight edge and the fourteenth straight edge on the air-gap side in the slot is an obtuse angle greater than 180 degrees, the included angle formed by the fourteenth straight edge and the fifteenth straight edge on the air-gap side in the slot is an acute angle, and the included angle formed by the fifteenth straight edge and the sixteenth straight edge on the air-gap side in the slot is an obtuse angle less than 180 degrees;

[0022] The sixth air-gap structure is formed by enclosing with the twentieth straight edge, the fourth arc, the twenty-first straight edge, the fifth arc and the twenty-second straight edge; the included angle formed by the twentieth straight edge and the twenty-first straight edge on the air-gap side in the slot is an obtuse angle less than 180 degrees, and the included angle formed by the twenty-first straight edge and the twenty-second straight edge on the air-gap side in the slot is an acute angle;

[0023] And / or, the twenty-first straight edge is disposed close to the outer peripheral edge of the punching sheet body;

[0024] And / or, the fourteenth straight edge is disposed close to the twenty-second straight edge, and the length of the fourteenth straight edge is similar to the length of the twenty-second straight edge.

[0025] In one embodiment, the first air-gap structure is formed by enclosing with the first straight edge, the sixth arc, the second straight edge, the seventh arc and the third straight edge, the included angle formed by the first straight edge and the second straight edge on the air-gap side in the slot is an obtuse angle less than 180 degrees, and the included angle formed by the second straight edge and the third straight edge on the air-gap side in the slot is an acute angle;

[0026] The second air-gap structure is formed by enclosing with the seventh straight edge, the eighth arc, the eighth straight edge, the ninth arc and the ninth straight edge, the included angle formed by the seventh straight edge and the eighth straight edge on the air-gap side in the slot is an obtuse angle less than 180 degrees, and the included angle formed by the eighth straight edge and the ninth straight edge on the air-gap side in the slot is an acute angle.

[0027] In the second aspect of the present application, a motor rotor is proposed, which includes the rotor punching sheet as described above.

[0028] In the third aspect of the present application, a permanent magnet synchronous motor is proposed, which includes the motor rotor as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application.

[0030] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of a rotor punching sheet according to an embodiment.

[0032] Figure 2 It is a schematic structural diagram of a magnetic slot unit according to an embodiment.

[0033] Figure 3 It is an arrangement structure diagram of a first magnetic slot, a first magnet, a fourth magnetic slot, and a fourth magnet according to an embodiment.

[0034] Figure 4 It is a schematic structural composition diagram of a second magnetic slot and a fifth magnetic slot according to an embodiment.

[0035] Figure 5 It is a schematic structural composition diagram of a fourth air gap structure according to an embodiment.

[0036] Figure 6 It is a schematic structural composition diagram of a sixth air gap structure according to an embodiment.

[0037] Explanation of reference numerals:

[0038] 100. Rotor punching sheet; 10. Punching sheet body; 11. Magnetic slot unit; 111. Inner magnetic slot group; 1111. First magnetic slot; 1111a. First air gap structure; 1111b. First straight edge; 1111c. Second straight edge; 1111d. Third straight edge; 1111e. Fourth straight edge; 1111f. Fifth straight edge; 1111g. Sixth straight edge; 1111h. Sixth arc; 1111i. Seventh arc; 1112. Second magnetic slot; 1112a. Thirteenth straight edge; 1112b. Fourteenth straight edge; 1112c. Fifteenth straight edge; 1112d. Sixteenth straight edge; 1112e. Seventeenth straight edge; 1112f. Eighteenth straight edge; 1112g. Nineteenth straight edge; 1112h. First arc; 1112i. Second arc; 1112j. Third arc; 1113. Third magnetic slot; 112. Outer magnetic slot group; 1121. Fourth magnetic slot; 1121a. Second air gap structure; 1121b. Seventh straight edge; 1121c. Eighth straight edge; 1121d. Ninth straight edge; 1121e. Tenth straight edge; 1121f. Eleventh straight edge; 1121g. Twelfth straight edge; 1121h. Eighth arc; 1121i. Ninth arc; 1122. Fifth magnetic slot; 1122a. Twentieth straight edge; 1122b. Twenty - first straight edge; 1122c. Twenty - second straight edge; 1122d. Twenty - third straight edge; 1122e. Twenty - fourth straight edge; 1122f. Twenty - fifth straight edge; 1122g. Fourth arc; 1122h. Fifth arc; 1123. Sixth magnetic slot; 113. Third air gap structure; 114. Fourth air gap structure; 115. Fifth air gap structure; 116. Sixth air gap structure; 20. First magnet; 30. Second magnet; 40. Third magnet; 50. Fourth magnet; 60. Fifth magnet; 70. Sixth magnet; 80. First magnetic isolation bridge; 90. Second magnetic isolation bridge. Detailed implementation manners

[0039] To make the above - mentioned objects, features, and advantages of the present application more obvious and understandable, the following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0040] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0041] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0042] In the present application, unless otherwise clearly specified and limited, if there are terms such as "mounted", "connected", "coupled", "fixed", etc., these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0044] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0045] Referring to Figure 1 , a rotor punching sheet 100 shown in an embodiment of the present application, includes a punching sheet main body 10.

[0046] Specifically, the rotor punching sheet 100 is an important part of the motor and is mainly used to manufacture the rotor of the motor. The rotor punching sheet 100 is formed by laminating multiple layers of silicon steel sheets, and a certain number of slots are opened on each layer of steel sheet. When these steel sheets are stacked together, the main structure of the rotor is formed.

[0047] In this application, the punching sheet main body 10 is of a circular structure, and the punching sheet main body 10 is provided with a plurality of magnetic slot units 11, and the plurality of magnetic slot units 11 are arranged at intervals along the circumferential direction of the punching sheet main body 10.

[0048] For example, Figure 1 shows that the magnetic slot units 11 are provided with twelve groups, and the twelve groups of magnetic slot units 11 are evenly spaced along the circumferential direction of the punching sheet main body 10.

[0049] Of course, in other alternative embodiments, the magnetic slot units 11 can also be set to other numbers and can be flexibly selected according to actual needs.

[0050] The magnetic slot unit 11 includes an inner magnetic slot group 111 and an outer magnetic slot group 112 arranged along the radial direction of the punching sheet main body 10.

[0051] It should be noted that the inner magnetic slot group 111 is defined as being arranged close to the center of the punching sheet main body 10, and the outer magnetic slot group 112 is defined as being farther from the center of the punching sheet main body 10 than the inner magnetic slot group 111.

[0052] Please continue to refer to Figure 2, the inner magnetic slot group 111 includes a first magnetic slot 1111, a second magnetic slot 1112, and a third magnetic slot 1113. The first magnetic slot 1111 is disposed between the second magnetic slot 1112 and the third magnetic slot 1113, and the three form a V-shaped structure layout. The first magnetic slot 1111 has a linear structure and is arranged tangentially to the punching sheet body 10; the outer magnetic slot group 112 includes a fourth magnetic slot 1121, a fifth magnetic slot 1122, and a sixth magnetic slot 1123. The fourth magnetic slot 1121 is disposed between the fifth magnetic slot 1122 and the sixth magnetic slot 1123, and the three form a V-shaped structure layout. The fourth magnetic slot 1121 has a linear structure and is arranged tangentially to the punching sheet body 10.

[0053] Among them, a first magnet 20 is disposed in the first magnetic slot 1111, a second magnet 30 is disposed in the second magnetic slot 1112, a third magnet 40 is disposed in the third magnetic slot 1113, a fourth magnet 50 is disposed in the fourth magnetic slot 1121, a fifth magnet 60 is disposed in the fifth magnetic slot 1122, and a sixth magnet 70 is disposed in the sixth magnetic slot 1123. Specifically, the first magnet 20 to the sixth magnet 70 are all made of permanent magnets.

[0054] A first magnetic isolation bridge 80 is disposed between the inner magnetic slot group 111 and the outer magnetic slot group 112. Second magnetic isolation bridges 90 are disposed between the first magnetic slot 1111 and the second magnetic slot 1112, between the first magnetic slot 1111 and the third magnetic slot 1113, between the fourth magnetic slot 1121 and the fifth magnetic slot 1122, and between the fourth magnetic slot 1121 and the sixth magnetic slot 1123.

[0055] In summary, implementing the technical solution of this embodiment will achieve the following beneficial effects: In this solution, a plurality of magnetic slot units 11 are arranged at intervals in the circumferential direction of the punching sheet body 10. Each magnetic slot unit 11 is composed of an inner magnetic slot group 111 and an outer magnetic slot group 112. The inner magnetic slot group 111 is composed of a first magnetic slot 1111, a second magnetic slot 1112, and a third magnetic slot 1113 arranged in a V-shaped structure, and the outer magnetic slot group 112 is composed of a fourth magnetic slot 1121, a fifth magnetic slot 1122, and a sixth magnetic slot 1123 arranged in a V-shaped structure. At the same time, both the first magnetic slot 1111 and the fourth magnetic slot 1121 are arranged in a straight-line structure along the tangential direction of the punching sheet body 10. On this basis, when the first magnet 20, the second magnet 30, the third magnet 40, the fourth magnet 50, the fifth magnet 60, and the sixth magnet 70 are respectively installed in their corresponding magnetic slots, the tangentially arranged first magnet 20 and fourth magnet 50 can effectively gather magnetic flux, increase magnetic density, thereby enhancing the output torque of the motor, and the magnetic field of the first magnet 20 and the fourth magnet 50 arranged in an inner and outer cooperative manner has a synergistic effect, further increasing magnetic density and improving torque density; while the two groups of magnets arranged in a V-shaped structure (the second magnet 30 and the third magnet 40 are one group, and the fifth magnet 60 and the sixth magnet 70 are the other group) can increase reluctance torque, reduce torque ripple, avoid the vehicle from jittering when driving at low speed, and improve driving comfort; further, setting an inner and outer two-layer arrangement structure can maximize the magnetic flux, output the maximum torque, and improve torque density.

[0056] In one embodiment, the second magnetic slot 1112 and the third magnetic slot 1113 are symmetrically arranged along the radial center line of the first magnetic slot 1111, the fifth magnetic slot 1122 and the sixth magnetic slot 1123 are symmetrically arranged along the radial center line of the fourth magnetic slot 1121, and the radial center lines of the first magnetic slot 1111 and the fourth magnetic slot 1121 are collinear with the symmetry center line of the V-shaped structure; wherein, the angle range of the V-shaped structure is: 115° to 125°.

[0057] That is to say, the first magnetic slot 1111 and the fourth magnetic slot 1121 are designed as a symmetric center structure, and at the same time, the second magnetic slot 1112 and the third magnetic slot 1113, as well as the fifth magnetic slot 1122 and the sixth magnetic slot 1123, are designed with a symmetric structure. On the one hand, it can reduce the manufacturing difficulty, and on the other hand, it can also make the magnetic field line distribution more uniform and concentrated, improving the magnetic flux utilization rate.

[0058] In one embodiment, the second magnet 30 and the third magnet 40 have the same size, and the sizes of the second magnet 30 and the third magnet 40 are both smaller than the size of the first magnet 20; the fifth magnet 60 and the sixth magnet 70 have the same size, and the sizes of the fifth magnet 60 and the sixth magnet 70 are both smaller than the size of the fourth magnet 50.

[0059] For example, the first magnet 20 to the sixth magnet 70 in the present application are all designed as cuboids, with a simple structure and convenient installation. The groove side walls of the first magnetic groove 1111 to the sixth magnetic groove 1123 are each provided with two spaced-apart limiting protrusions protruding towards the inner part of the groove cavity. The two limiting protrusions are used to clamp and fix each magnet to improve the stability of the magnet installation in the corresponding magnetic groove.

[0060] Please continue to refer to Figure 2 , in addition, on the basis of any of the above embodiments, two first air-gap structures 1111a are formed on opposite sides of the first magnet 20 in the first magnetic groove 1111, two second air-gap structures 1121a are formed on opposite sides of the fourth magnet 50 in the fourth magnetic groove 1121, third air-gap structures 113 are formed on the side of the second magnetic groove 1112 and the third magnetic groove 1113 close to the first magnetic groove 1111, fourth air-gap structures 114 are formed on the side of the second magnetic groove 1112 and the third magnetic groove 1113 away from the first magnetic groove 1111, fifth air-gap structures 115 are formed on the side of the fifth magnetic groove 1122 and the sixth magnetic groove 1123 close to the fourth magnetic groove 1121, and sixth air-gap structures 116 are formed on the side of the fifth magnetic groove 1122 and the sixth magnetic groove 1123 away from the fourth magnetic groove 1121;

[0061] Among them, the third air-gap structure 113 and the fifth air-gap structure 115 have the same shape, and the fourth air-gap structure 114 and the sixth air-gap structure 116 have different shapes.

[0062] First of all, when the temperature changes, the magnet material will undergo thermal expansion. If the magnet completely fills the magnetic groove, when the temperature rises, the expansion of the magnet may exert a great pressure on the magnetic groove, resulting in deformation of the magnetic groove or damage to the magnet. Leaving space (i.e., each air-gap structure) can provide a certain margin for the thermal expansion of the magnet.

[0063] Secondly, the air-gap structure is a part of the magnetic circuit, and it can adjust the magnetic resistance of the magnetic circuit. In an electromagnetic device, the size of the magnetic resistance will affect the intensity and distribution of the magnetic field. By adjusting the size of the air-gap structure, the magnetic resistance of the magnetic circuit can be changed, thereby realizing the adjustment of the magnetic field. The magnetic permeability of the air in the air-gap structure is much smaller than that of the magnetic material of the magnet, and it can make the magnetic flux distribute more reasonably in the magnetic circuit and avoid local magnetic saturation.

[0064] Please continue to refer to Figure 3, more specifically, in an alternative embodiment, the first magnetic slot 1111 includes a first straight edge 1111b, a second straight edge 1111c, a third straight edge 1111d, a fourth straight edge 1111e, a fifth straight edge 1111f, and a sixth straight edge 1111g, and the fourth magnetic slot 1121 includes a seventh straight edge 1121b, an eighth straight edge 1121c, a ninth straight edge 1121d, a tenth straight edge 1121e, an eleventh straight edge 1121f, and a twelfth straight edge 1121g.

[0065] Both the first magnetic slot 1111 and the fourth magnetic slot 1121 are isosceles trapezoids. The first straight edge 1111b, the fourth straight edge 1111e, the seventh straight edge 1121b, and the tenth straight edge 1121e are parallel to each other. The third straight edge 1111d, the fourth straight edge 1111e, and the fifth straight edge 1111f are collinear. The ninth straight edge 1121d, the tenth straight edge 1121e, and the eleventh straight edge 1121f are collinear. The second straight edge 1111c and the sixth straight edge 1111g are equal in length. The eighth straight edge 1121c and the twelfth straight edge 1121g are equal in length. The second straight edge 1111c is parallel to the eighth straight edge 1121c, and the sixth straight edge 1111g is parallel to the twelfth straight edge 1121g.

[0066] In this way, the first magnetic slot 1111 and the fourth magnetic slot 1121 are arranged in a linear structure. After the first magnet 20 and the fourth magnet 50 are respectively installed in the first magnetic slot 1111 and the fourth magnetic slot 1121, both the inner first magnet 20 and the outer fourth magnet 50 can increase the permanent magnet torque, and the double-layer arrangement in the inner layer can further superimpose and increase the permanent magnet torque.

[0067] Please continue to refer to Figure 4 , in one of the embodiments, both the second magnetic slot 1112 and the third magnetic slot 1113 include a thirteenth straight edge 1112a, a fourteenth straight edge 1112b, a fifteenth straight edge 1112c, a sixteenth straight edge 1112d, a seventeenth straight edge 1112e, an eighteenth straight edge 1112f, and a nineteenth straight edge 1112g.

[0068] Both the fifth magnetic slot 1122 and the sixth magnetic slot 1123 include a twentieth straight edge 1122a, a twenty-first straight edge 1122b, a twenty-second straight edge 1122c, a twenty-third straight edge 1122d, a twenty-fourth straight edge 1122e, and a twenty-fifth straight edge 1122f.

[0069] The thirteenth straight edge 1112a, the seventeenth straight edge 1112e, the twentieth straight edge 1122a, and the twenty-second straight edge 1122c are parallel to each other. The sixteenth straight edge 1112d, the seventeenth straight edge 1112e, and the eighteenth straight edge 1112f are collinear. The twenty-third straight edge 1122d and the twenty-fourth straight edge 1122e are collinear. The nineteenth straight edge 1112g and the twenty-fifth straight edge 1122f are collinear.

[0070] Combined with the attached Figure 4 It can be seen that between the second magnetic slot 1112 and the fifth magnetic slot 1122, and between the third magnetic slot 1113 and the sixth magnetic slot 1123, a shape design that matches each other is adopted. This shape combination can make the generated magnetic lines of force more concentrated after the magnets are installed, resulting in a higher magnetic flux utilization rate, and thus a larger torque can be output.

[0071] Please continue to refer to Figure 5 , in one embodiment, the fourth air-gap structure 114 is formed by enclosing the thirteenth straight edge 1112a, the first arc 1112h, the fourteenth straight edge 1112b, the second arc 1112i, the fifteenth straight edge 1112c, the third arc 1112j, and the sixteenth straight edge 1112d; the included angle formed by the thirteenth straight edge 1112a and the fourteenth straight edge 1112b on the air-gap side inside the slot is an obtuse angle greater than 180 degrees, the included angle formed by the fourteenth straight edge 1112b and the fifteenth straight edge 1112c on the air-gap side inside the slot is an acute angle, and the included angle formed by the fifteenth straight edge 1112c and the sixteenth straight edge 1112d on the air-gap side inside the slot is an obtuse angle less than 180 degrees.

[0072] Please continue to refer to Figure 6 , the sixth air-gap structure 116 is formed by enclosing the twentieth straight edge 1122a, the fourth arc 1122g, the twenty-first straight edge 1122b, the fifth arc 1122h, and the twenty-second straight edge 1122c; the included angle formed by the twentieth straight edge 1122a and the twenty-first straight edge 1122b on the air-gap side inside the slot is an obtuse angle less than 180 degrees, and the included angle formed by the twenty-first straight edge 1122b and the twenty-second straight edge 1122c on the air-gap side inside the slot is an acute angle.

[0073] The fourth air-gap structure 114 and the sixth air-gap structure 116 surrounded by the above structure have a higher compactness and are shape-matched. By arranging the fourteenth straight edge 1112b closer to the twenty-second straight edge 1122c, the occurrence of magnetic leakage can be effectively reduced, which is helpful for outputting a larger torque.

[0074] Furthermore, the twenty-first straight edge 1122b is arranged close to the outer peripheral edge of the punching sheet body 10. On the basis of not affecting the mechanical strength of the motor, arranging the twenty-first straight edge 1122b close to the edge of the punching sheet body 10 can make the outer magnetic bridge approach magnetic circuit saturation, thereby reducing the magnetic circuit leakage magnetic flux, maintaining a certain magnetic density amplitude, and ensuring the permanent magnet magnetic chain and the average torque.

[0075] Furthermore, the fourteenth straight edge 1112b is disposed adjacent to the twenty-second straight edge 1122c, and the length of the fourteenth straight edge 1112b is similar to that of the twenty-second straight edge 1122c. Ensure that the twenty-first straight edge 1122b has a certain length to reduce magnetic leakage. In addition, making the distance between the fourteenth straight edge 1112b of the second magnetic slot 1112 and the twenty-second straight edge 1122c of the fifth magnetic slot 1122 as small as possible and having a similar length helps to strengthen the solution to the problem of magnetic leakage.

[0076] Please continue to refer to Figure 3 , in one of the embodiments, the first air-gap structure 1111a is formed by enclosing the first straight edge 1111b, the sixth arc 1111h, the second straight edge 1111c, the seventh arc 1111i, and the third straight edge 1111d. The included angle formed by the first straight edge 1111b and the second straight edge 1111c on the air-gap side in the slot is an obtuse angle less than 180 degrees, and the included angle formed by the second straight edge 1111c and the third straight edge 1111d on the air-gap side in the slot is an acute angle.

[0077] The second air-gap structure 1121a is formed by enclosing the seventh straight edge 1121b, the eighth arc 1121h, the eighth straight edge 1121c, the ninth arc 1121i, and the ninth straight edge 1121d. The included angle formed by the seventh straight edge 1121b and the eighth straight edge 1121c on the air-gap side in the slot is an obtuse angle less than 180 degrees, and the included angle formed by the eighth straight edge 1121c and the ninth straight edge 1121d on the air-gap side in the slot is an acute angle. With such a design, magnetic leakage can be better prevented, the magnetic flux utilization rate is higher, and thus the output torque is greater.

[0078] In addition to the above, the present application also protects a permanent magnet synchronous motor, which includes but is not limited to a motor rotor. The motor rotor includes the rotor punching sheet 100 described in any of the above embodiments.

[0079] It should be noted that the permanent magnet synchronous motor also includes other structural components, such as a stator assembly, etc., which are not mentioned in the present application and do not limit the protection scope of the present application.

[0080] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0081] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A rotor punching sheet, characterized in that, Including: A punching sheet body, wherein a plurality of magnetic slot units are provided on the punching sheet body, and the plurality of magnetic slot units are arranged at intervals along the circumferential direction of the punching sheet body. The magnetic slot unit includes an inner magnetic slot group and an outer magnetic slot group arranged along the radial direction of the punching sheet body. The inner magnetic slot group includes a first magnetic slot, a second magnetic slot, and a third magnetic slot. The first magnetic slot is arranged between the second magnetic slot and the third magnetic slot, and the three form a V-shaped structure layout. The first magnetic slot has a linear structure and is arranged along the tangential direction of the punching sheet body; the outer magnetic slot group includes a fourth magnetic slot, a fifth magnetic slot, and a sixth magnetic slot. The fourth magnetic slot is arranged between the fifth magnetic slot and the sixth magnetic slot, and the three form a V-shaped structure layout. The fourth magnetic slot has a linear structure and is arranged along the tangential direction of the punching sheet body. Wherein, a first magnet is arranged in the first magnetic slot, a second magnet is arranged in the second magnetic slot, a third magnet is arranged in the third magnetic slot, a fourth magnet is arranged in the fourth magnetic slot, a fifth magnet is arranged in the fifth magnetic slot, and a sixth magnet is arranged in the sixth magnetic slot. A first magnetic isolation bridge is arranged between the inner magnetic slot group and the outer magnetic slot group, and second magnetic isolation bridges are arranged between the first magnetic slot and the second magnetic slot, between the first magnetic slot and the third magnetic slot, between the fourth magnetic slot and the fifth magnetic slot, and between the fourth magnetic slot and the sixth magnetic slot. Fourth air gap structures are formed on the sides of the second magnetic slot and the third magnetic slot away from the first magnetic slot, and sixth air gap structures are formed on the sides of the fifth magnetic slot and the sixth magnetic slot away from the fourth magnetic slot. The second magnetic slot and the third magnetic slot both include a thirteenth straight edge, and the fifth magnetic slot and the sixth magnetic slot both include a twentieth straight edge. The fourth air gap structure is formed by enclosing the thirteenth straight edge, a first arc, a fourteenth straight edge, a second arc, a fifteenth straight edge, a third arc, and a sixteenth straight edge; the included angle formed by the thirteenth straight edge and the fourteenth straight edge on the side of the air gap in the slot is an obtuse angle greater than 180 degrees, the included angle formed by the fourteenth straight edge and the fifteenth straight edge on the side of the air gap in the slot is an acute angle, and the included angle formed by the fifteenth straight edge and the sixteenth straight edge on the side of the air gap in the slot is an obtuse angle less than 180 degrees. The sixth air gap structure is formed by enclosing the twentieth straight edge, a fourth arc, a twenty-first straight edge, a fifth arc, and a twenty-second straight edge; the included angle formed by the twentieth straight edge and the twenty-first straight edge on the side of the air gap in the slot is an obtuse angle less than 180 degrees, and the included angle formed by the twenty-first straight edge and the twenty-second straight edge on the side of the air gap in the slot is an acute angle.

2. The rotor punching sheet according to claim 1, wherein, The second magnetic slot and the third magnetic slot are symmetrically arranged along the radial center line of the first magnetic slot, the fifth magnetic slot and the sixth magnetic slot are symmetrically arranged along the radial center line of the fourth magnetic slot, and the radial center line of the first magnetic slot and the radial center line of the fourth magnetic slot are collinear with the symmetry center line of the V-shaped structure; wherein, the angular range of the V-shaped structure is: 115° - 125°.

3. The rotor punching sheet according to claim 1, wherein The second magnet and the third magnet have the same size, and the sizes of the second magnet and the third magnet are both smaller than the size of the first magnet; The fifth magnet and the sixth magnet have the same size, and the sizes of the fifth magnet and the sixth magnet are both smaller than the size of the fourth magnet.

4. The rotor punching sheet according to claim 1, wherein Two first air gap structures are formed on opposite sides of the first magnet in the first magnetic groove, two second air gap structures are formed on opposite sides of the fourth magnet in the fourth magnetic groove, third air gap structures are formed on the sides of the second magnetic groove and the third magnetic groove close to the first magnetic groove, and fifth air gap structures are formed on the sides of the fifth magnetic groove and the sixth magnetic groove close to the fourth magnetic groove; Wherein, the third air gap structure and the fifth air gap structure have the same shape, and the fourth air gap structure and the sixth air gap structure have different shapes.

5. The rotor punching sheet according to claim 4, characterized in that, The first magnetic groove includes a first straight side, a second straight side, a third straight side, a fourth straight side, a fifth straight side and a sixth straight side, and the fourth magnetic groove includes a seventh straight side, an eighth straight side, a ninth straight side, a tenth straight side, an eleventh straight side and a twelfth straight side; Both the first magnetic groove and the fourth magnetic groove are isosceles trapezoids. The first straight side, the fourth straight side, the seventh straight side and the tenth straight side are parallel to each other. The third straight side, the fourth straight side and the fifth straight side are collinear. The ninth straight side, the tenth straight side and the eleventh straight side are collinear. The second straight side and the sixth straight side have equal lengths. The eighth straight side and the twelfth straight side have equal lengths. The second straight side is parallel to the eighth straight side, and the sixth straight side is parallel to the twelfth straight side.

6. The rotor punching sheet according to claim 5, characterized in that, Both the second magnetic groove and the third magnetic groove include a fourteenth straight side, a fifteenth straight side, a sixteenth straight side, a seventeenth straight side, an eighteenth straight side and a nineteenth straight side; Both the fifth magnetic groove and the sixth magnetic groove include a twenty-first straight side, a twenty-second straight side, a twenty-third straight side, a twenty-fourth straight side and a twenty-fifth straight side; The thirteenth straight side, the seventeenth straight side, the twentieth straight side and the twenty-third straight side are parallel to each other. The sixteenth straight side, the seventeenth straight side and the eighteenth straight side are collinear. The twenty-third straight side and the twenty-fourth straight side are collinear. The nineteenth straight side and the twenty-fifth straight side are collinear.

7. The rotor punching sheet according to claim 6, wherein The twenty-first straight side is arranged close to the outer peripheral edge of the punching sheet main body; And / or, the fourteenth straight side is arranged close to the twenty-second straight side, and the length of the fourteenth straight side is substantially the same as the length of the twenty-second straight side.

8. The rotor punching sheet according to claim 5, characterized in that The first air gap structure is formed by enclosing with the first straight side, the sixth arc, the second straight side, the seventh arc and the third straight side. The included angle formed by the first straight side and the second straight side on the air gap side in the groove is an obtuse angle less than 180 degrees, and the included angle formed by the second straight side and the third straight side on the air gap side in the groove is an acute angle; The second air gap structure is formed by enclosing with the seventh straight side, the eighth arc, the eighth straight side, the ninth arc and the ninth straight side. The included angle formed by the seventh straight side and the eighth straight side on the air gap side in the groove is an obtuse angle less than 180 degrees, and the included angle formed by the eighth straight side and the ninth straight side on the air gap side in the groove is an acute angle.

9. A motor rotor, characterized in that, Comprising a rotor punching sheet as described in any one of claims 1 to 8.

10. A permanent magnet synchronous motor, characterized in that, Comprising an electric motor rotor as described in claim 9.

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