Rotor structure and motor structure

Abstract

Embodiments of the present invention provide a rotor structure and motor structure, wherein the rotor structure comprises: a rotor core having permanent magnet slots formed therein; permanent magnets disposed within the permanent magnet slots; and extended slots disposed in the rotor core, with their ends facing the permanent magnets and the outer edge of the rotor core, respectively. The technical solution of the present invention effectively suppresses the motor's quadrature-axis armature reaction, mitigates magnetic saturation, and improves the motor's torque density and overload capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor structure and a motor structure. Background Art

[0002] With the development of the times, the requirements for motor performance and cost-effectiveness are gradually becoming higher. For motors, the quadrature-axis armature reaction will deepen the degree of magnetic saturation of the motor, thus hindering the improvement of motor performance. Summary of the Invention

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

[0004] In view of this, an embodiment of a first aspect of the present invention provides a rotor structure.

[0005] An embodiment of a second aspect of the present invention provides a motor structure.

[0006] In order to achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention provides a rotor structure, including: a rotor core, on which permanent magnet slots are formed; permanent magnets, arranged in the permanent magnet slots; and extension slots, arranged on the rotor core, with both ends of the extension slots facing the permanent magnets and the outer edges of the rotor core, respectively.

[0007] According to the embodiment of the first aspect of the present invention, the rotor structure provided includes a rotor core and a permanent magnet arranged in the rotor core, so that the rotor structure can be driven by the magnetic effect of the permanent magnet and rotate relative to the stator to achieve normal operation of the motor. Specifically, a permanent magnet slot is provided on the rotor core, which passes through the two end faces. The permanent magnet can be arranged in the permanent magnet slot, which can facilitate the permanent magnet to be driven by magnetic force. An extension slot is also provided on the rotor core. By limiting the extension direction of the two ends of the extension slot to be toward the permanent magnet and the outer edge, the extension slot can be used as a structure to alleviate the degree of magnetic saturation, forming a magnetic barrier in the rotor structure, so as to improve the power density and torque density of the motor and enhance the overload capacity of the motor.

[0008] The rotor structure of this solution effectively suppresses the quadrature-axis armature reaction of the motor, alleviates the degree of magnetic saturation, and improves the torque density and overload capacity of the motor.

[0009] There may be multiple permanent magnet slots. Generally, the multiple permanent magnet slots are evenly arranged around the axis of the rotor core.

[0010] In addition, for the permanent magnet slot, at least one of the two ends may penetrate the end surface, for example, both ends may penetrate, or one end may penetrate, or neither end may penetrate the end surface.

[0011] Among them, the extension direction of the permanent magnet slot can be the axial direction of the rotor core, or it can be a direction with a certain twist angle to the axial direction (that is, skew pole). Of course, considering the processing cost and difficulty, a segmented twisting method can be used for approximation.

[0012] It can be understood that for the rotor core, the permanent magnet slots and the outer edge of the rotor core are located in two directions. Therefore, by limiting the two ends of the extension slot to face the permanent magnet and the outer edge of the rotor core respectively, the extension slot itself will bend to a certain extent.

[0013] In addition, the rotor structure in the above solution provided by the present invention may also have the following additional technical features:

[0014] In the above technical solution, the extended slot specifically includes: a first slot segment, which extends toward the permanent magnet slot; and a second slot segment, which is connected to the first slot segment and extends toward the outer edge of the rotor core.

[0015] In this technical solution, the extended slot mainly includes two parts, namely the first slot segment and the second slot segment. The first slot segment and the second slot segment are connected, wherein the ends of the first slot segment and the second slot segment facing away from each other are respectively facing the permanent magnet slot and the outer edge of the rotor core. The two parts of the extended slot are respectively facing structures at different positions, and the two parts need to be connected. Under the joint action of the two parts, the quadrature-axis armature reaction of the motor can be effectively suppressed, thereby alleviating the degree of magnetic saturation.

[0016] In the above technical solution, on the cross section of the rotor core, the angle between the extension direction of the first slot segment and the extension direction of the permanent magnet slot is 60° to 120°; on the cross section of the rotor core, the angle between the extension direction of the second slot segment and the rotation direction of the rotor core is 60° to 120°.

[0017] In this technical solution, by restricting the extension direction of the first slot segment and the second slot segment, the quadrature-axis armature reaction of the motor can be effectively suppressed under the action of the magnetic barrier, and the degree of magnetic saturation can be alleviated, thereby increasing the power density and torque density of the motor and improving the overload capacity of the motor. Specifically, the cross-section of the rotor core is the normal plane to the axis of the rotor core. On this cross-section, the extension direction of the first slot segment and the extension direction of the permanent magnet slot can be orthogonal or approximately orthogonal, and the specific angle between the two can range from 60° to 120°. Of course, on this cross-section, the extension direction of the second slot segment and the rotation direction of the rotor core can be orthogonal or approximately orthogonal, and the specific angle between the two can range from 60° to 120°.

[0018] In the above technical solution, the first slot section and the second slot section are connected with each other in a smooth transition.

[0019] In this technical solution, since the first slot segment and the second slot segment are connected, the transition between the first slot segment and the second slot segment can be smoothed by limiting the transition, thereby reducing the processing difficulty and processing cost.

[0020] It can be understood that the smooth transition between the first slot segment and the second slot segment is a curved transition. When a certain angle is formed between the first slot segment and the second slot segment, if the slot widths of the two slot segments are the same, an arc transition can also be used.

[0021] In the above technical solution, one end of the first slot segment away from the second slot segment is connected to the permanent magnet slot.

[0022] In this technical solution, by limiting one end of the first slot segment facing the permanent magnet slot to be directly connected to the permanent magnet slot, in terms of structure, the first slot segment is directly connected to the permanent magnet slot to achieve the effect of suppressing the quadrature-axis armature reaction of the motor to a greater extent.

[0023] In the above technical solution, there is a first distance between the end of the first slot segment away from the second slot segment and the permanent magnet slot.

[0024] In this technical solution, one end of the first slot segment facing the permanent magnet slot is not connected to the permanent magnet slot through restriction, that is, there is a certain distance between the two. For the extended slot as a whole, one end is a closed structure. In terms of structure, there is a certain distance between the first slot segment and the permanent magnet slot, which can also achieve the effect of suppressing the cross-axis armature reaction of the motor while ensuring the integrity of the punching sheet as much as possible.

[0025] In the above technical solution, the first spacing is greater than 0.2 mm.

[0026] In this technical solution, when the first slot segment is not connected to the permanent magnet slot, the distance between the two needs to be greater than 0.2 mm, so that the structural strength of the rotor core between the first slot segment and the permanent magnet slot can be ensured when the rotor core is processed.

[0027] In the above technical solution, one end of the second slot segment away from the first slot segment is connected to the outer edge of the rotor core.

[0028] In this technical solution, by limiting one end of the second slot segment toward the outer edge to be directly connected to the outer edge, structurally, the second slot segment is directly connected to the outer edge, thereby achieving the effect of suppressing the quadrature-axis armature reaction of the motor to a greater extent.

[0029] In the above technical solution, there is a second distance between the end of the second slot segment away from the first slot segment and the outer edge of the rotor core.

[0030] In this technical solution, one end of the second slot segment facing the outer edge is not connected to the outer edge through restriction, that is, there is a certain distance between the two. For the extended slot as a whole, one end is a closed structure, and in terms of structure, there is a certain distance between the second slot segment and the outer edge, which can also achieve the effect of suppressing the cross-axis armature reaction of the motor while ensuring the integrity of the punching sheet as much as possible.

[0031] In the above technical solution, the second spacing is greater than 0.2 mm.

[0032] In this technical solution, when the second slot segment is not connected to the outer edge, the distance between the two needs to be greater than 0.2 mm, so that a certain strength of the outer edge can be ensured when the rotor core is processed.

[0033] In the above technical solution, the rotor core specifically includes: a plurality of laminated punching sheets, wherein each punching sheet is provided with an assembly opening, and the plurality of assembly openings form permanent magnet slots.

[0034] In this technical solution, in order to facilitate processing, the rotor core is mainly composed of multiple punching sheets, and the rotor core can be formed by stacking and assembling multiple punching sheets. It should be noted that during processing, an assembly opening can be formed on each punching sheet separately, and then after assembly, multiple assembly openings can form permanent magnet slots for accommodating permanent magnets, so as to facilitate the rotation of the rotor structure.

[0035] In the above technical solution, the permanent magnet slot specifically includes: a first slot body; a second slot body, which is connected to the first slot body or there is an inter-slot magnetic bridge gap between the second slot body and the first slot body, wherein the radial dimension of the first slot body is different from the radial dimension of the second slot body, and / or the tangential dimension of the first slot body is different from the tangential dimension of the second slot body, and the minimum width of the inter-slot magnetic bridge gap is less than 3 mm.

[0036] In this technical solution, the permanent magnet slot may include a first slot body and a second slot body that are connected, or a first slot body and a second slot body with a magnetic bridge gap between the slots, wherein at least one of the radial dimensions and tangential dimensions of the two slot bodies is different, so as to accommodate permanent magnets of different sizes or different magnetic capacities. Specifically, the radial dimensions of the first slot body and the second slot body may be different, or the tangential dimensions of the first slot body and the second slot body may be different. Alternatively, both the radial dimensions and the tangential dimensions of the first slot body and the second slot body may be different.

[0037] In addition, there may be an inter-slot magnetic bridge gap with a narrowest width of less than 3 mm between the first slot body and the second slot body. It can be understood that since the first slot body and the second slot body are not connected, the connection strength is high during the rotation process, and the operation is relatively stable.

[0038] It can be understood that when the volume of the magnet is different, its magnetic capacity will change accordingly.

[0039] The above technical solution includes: a first magnet disposed in a first slot; a second magnet disposed in a second slot, wherein the magnetic properties of the second magnet are different from those of the first magnet.

[0040] In this technical solution, by arranging the first magnet and the second magnet with different magnetic properties in the first slot body and the second slot body respectively, it is convenient to cooperate with slot bodies of different sizes to fully utilize the space of the rotor core and meet the performance requirements of the rotor structure.

[0041] The difference in magnetic properties between the two may be in the form of different volumes, different magnetic materials, or even different shapes.

[0042] In the above technical solution, the radial dimension of the first slot body is larger than the radial dimension of the second slot body, and the tangential dimension of the first slot body is larger than the tangential dimension of the second slot body, wherein the magnetic energy product of the first magnet is smaller than the magnetic energy product of the second magnet.

[0043] In this technical solution, by further defining the dimensions of the first and second slots, the coordination with the extension slot can be improved. Specifically, the extension slot can vary in shape depending on the differences between the first and second slots. Specifically, the larger dimensions of the first slot and the smaller magnetic energy product of the first magnet within the first slot minimize the difference in magnetic effect between the first and second magnets, ensuring the stability of the rotor structure during rotation and the stability of the motor's power output during operation.

[0044] It can be understood that the larger the magnetic energy product, the less magnetic material is required to produce the same effect, that is, the smaller the volume.

[0045] In the above technical solution, in the radial direction of the rotor core, the first slot body is arranged on the inner side of the second slot body.

[0046] In this technical solution, by limiting the first slot body to be arranged radially inside the second slot body, that is, in the radial direction of the rotor core, the first slot body is arranged inwardly, so that the size of the inner magnet is larger and the size of the outer magnet is smaller, which can effectively reduce leakage magnetic flux and improve the sinusoidal degree of air gap magnetic density.

[0047] Of course, since there are generally multiple permanent magnet slots, each permanent magnet slot includes a first slot body and a second slot body.

[0048] In the above technical solution, in the radial direction of the rotor core, a second slot body is provided on both sides of each first slot body.

[0049] In this technical solution, each permanent magnet slot is composed of a first slot body and two second slot bodies. The larger first slot body is located in the middle, and a smaller second slot body is provided on both sides of the extension direction of the first slot body. Different slot bodies can be connected to one end of the extension slot or spaced apart to achieve the effect of suppressing the cross-axis armature reaction of the motor.

[0050] In the above technical solution, the first slot body and the second slot body are arranged on the rotor core along the radial direction of the rotor core.

[0051] In this technical solution, by arranging the first slot body and the second slot body radially on the rotor core, the magnetic circuits can be connected in parallel, thereby increasing the magnetic load of the motor.

[0052] In the above technical solution, the cross section of the rotor core is circular, the number of permanent magnet slots is an even number, and the rotor core is divided into an even number of sector-shaped areas by the permanent magnet slots, wherein the number of permanent magnet slots is the same as the number of sector-shaped areas.

[0053] In this technical solution, by limiting the cross-section of the rotor core to a circle, the rotor core as a whole is cylindrical. By setting an even number of permanent magnet slots, the rotor core can be divided into the same number of sector-shaped areas. It can be understood that the permanent magnet slots will be evenly arranged on the rotor core around the axis, and there is a permanent magnet slot on each of the two circumferential sides of each sector-shaped area, which can realize the block assembly method of the rotor core.

[0054] An embodiment of the second aspect of the present invention provides a motor structure, comprising: a stator; and a rotor structure as in the technical solution of the first aspect, which is coaxially arranged with the stator and can rotate relative to the stator.

[0055] According to the second aspect of the present invention, the motor structure provided in the embodiment includes a stator and a rotor structure, wherein the rotor structure in the above-mentioned first aspect technical solution is provided in the motor structure, and thus has the beneficial effects of any of the above-mentioned rotor structures, which will not be repeated here.

[0056] It should be emphasized that since the motor structure includes the above-mentioned rotor structure, it can effectively suppress the motor's quadrature-axis armature reaction, alleviate the degree of magnetic saturation, and improve the motor's torque density and overload capacity; on the other hand, it can also weaken the rotor's magnetic field harmonics in the air gap and improve the motor's torque pulsation.

[0057] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 A schematic structural diagram of a rotor structure according to an embodiment of the present invention is shown;

[0059] Figure 2 A schematic structural diagram of a rotor structure according to an embodiment of the present invention is shown;

[0060] Figure 3 Shown Figure 2 A partial enlarged schematic diagram of part A;

[0061] Figure 4 Shown Figure 2 A partial enlarged schematic diagram of part B;

[0062] Figure 5 A schematic structural diagram of a portion of a punching sheet according to an embodiment of the present invention is shown;

[0063] Figure 6 A schematic structural diagram of a rotor structure according to an embodiment of the present invention is shown;

[0064] Figure 7 A schematic structural diagram of a rotor structure according to an embodiment of the present invention is shown;

[0065] Figure 8 A schematic structural diagram of a rotor structure according to an embodiment of the present invention is shown;

[0066] Figure 9 A schematic structural diagram of a rotor structure according to an embodiment of the present invention is shown;

[0067] Figure 10 A schematic structural diagram of a rotor structure according to an embodiment of the present invention is shown;

[0068] Figure 11 A schematic structural diagram of a rotor structure according to an embodiment of the present invention is shown;

[0069] Figure 12 A schematic structural diagram of a rotor structure according to an embodiment of the present invention is shown;

[0070] Figure 13 A schematic structural diagram of a rotor structure according to an embodiment of the present invention is shown;

[0071] Figure 14 A schematic structural diagram of a motor structure according to an embodiment of the present invention is shown;

[0072] Figure 15 A schematic structural diagram of a motor structure according to an embodiment of the present invention is shown.

[0073] in, Figures 1 to 15 The corresponding relationship between the reference numerals and component names is as follows:

[0074] 100: rotor structure; 102: rotor core; 1022: punching sheet; 1024: assembly opening; 103: permanent magnet slot; 1032: first slot body; 1034: second slot body; 104: permanent magnet; 1042: first magnet; 1044: second magnet; 106: extension slot; 1062: first slot section; 1064: second slot section; 200: motor structure; 202: stator; 204: air gap. DETAILED DESCRIPTION

[0075] In order to more clearly understand the above-mentioned purposes, features and advantages of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0076] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the embodiments of the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0077] Refer to the following Figures 1 to 15 Some embodiments according to the present invention are described.

[0078] Example 1

[0079] like Figures 1 to 4 As shown, the present embodiment proposes a rotor structure 100, comprising a rotor core 102 and a permanent magnet 104 disposed within the rotor core 102, so that the rotor structure 100 can be driven by the magnetic action of the permanent magnet 104 and can rotate relative to the stator 202 to achieve normal operation of the motor. Specifically, the rotor core 102 is provided with a permanent magnet slot 103, and the permanent magnet 104 can be disposed within the permanent magnet slot 103, so that the permanent magnet 104 can be driven by magnetic force. Figure 2 As shown, an extension slot 106 is further provided on the rotor core 102. By limiting the extension direction of the two ends of the extension slot 106 to be toward the permanent magnet 104 and the outer edge, the extension slot 106 can be used as a structure to alleviate the degree of magnetic saturation, forming a magnetic barrier in the rotor structure 100, thereby improving the power density and torque density of the motor and enhancing the overload capacity of the motor.

[0080] According to the rotor structure 100 of this solution, the quadrature-axis armature reaction of the motor is effectively suppressed, the magnetic saturation degree is alleviated, and the torque density and overload capacity of the motor are improved.

[0081] There may be multiple permanent magnet slots 103 . Generally, the multiple permanent magnet slots 103 are evenly arranged around the axis of the rotor core 102 .

[0082] In addition, for the permanent magnet slot 103 , at least one of the two ends may be penetrated through the end surface, for example, both ends may be penetrated, or one end may be penetrated, or neither end may be penetrated through the end surface.

[0083] Among them, the extension direction of the permanent magnet slot 103 can be the axial direction of the rotor core 102, or it can be a direction with a certain twist angle to the axial direction (that is, oblique pole). Of course, considering the processing cost and difficulty, a segmented twisting method can be used for approximation.

[0084] It can be understood that for the rotor core 102, the permanent magnet slots 103 and the outer edge of the rotor core 102 are located in two directions. Therefore, by limiting the two ends of the extension slot 106 to face the permanent magnet 104 and the outer edge of the rotor core 102 respectively, the extension slot 106 itself will bend to a certain extent.

[0085] Furthermore, in order to facilitate processing, Figure 5 As shown, the rotor core 102 is mainly composed of a plurality of punching sheets 1022. The rotor core 102 can be formed by stacking and assembling the plurality of punching sheets 1022. It should be noted that during processing, an assembly opening 1024 can be formed on each punching sheet 1022 separately. After assembly, the plurality of assembly openings 1024 can form permanent magnet slots 103 for accommodating permanent magnets 104, so as to facilitate the rotation of the rotor structure 100.

[0086] Furthermore, if Figure 2 As shown, by radially arranging the first slot body 1032 and the second slot body 1034 on the rotor core 102, for different permanent magnet slots 103, the permanent magnets 104 arranged inside can be subjected to a more vertical magnetic force when the rotor core 102 rotates, thereby fully utilizing the magnetic force and improving the output efficiency.

[0087] In a specific embodiment, the cross-section of the rotor core 102 is circular, and the rotor core 102 as a whole is cylindrical. By providing an even number of permanent magnet slots 103, the rotor core 102 can be divided into the same number of sector-shaped areas. It can be understood that the permanent magnet slots 103 will be evenly arranged on the rotor core 102 around the axis, and each sector-shaped area has a permanent magnet slot 103 on both sides of the circumference, which can realize the block assembly of the rotor core.

[0088] Example 2

[0089] like Figures 1 to 4As shown, a rotor structure 100 proposed in this embodiment includes a rotor core 102 and a permanent magnet 104 disposed within the rotor core 102, so that the rotor structure 100 can be driven by the magnetic action of the permanent magnet 104 and can rotate relative to the stator 202 to achieve normal operation of the motor. Specifically, a permanent magnet slot 103 is provided on the rotor core 102, and the permanent magnet 104 can be disposed within the permanent magnet slot 103, which can facilitate the permanent magnet 104 to be driven by magnetic force. An extension slot 106 is also provided on the rotor core 102. By limiting the extension direction of the two ends of the extension slot 106 to be toward the permanent magnet 104 and the outer edge, the extension slot 106 can be used as a structure to alleviate the degree of magnetic saturation, forming a magnetic barrier in the rotor structure 100, thereby improving the power density and torque density of the motor and enhancing the overload capacity of the motor.

[0090] According to the rotor structure 100 of this solution, the quadrature-axis armature reaction of the motor is effectively suppressed, the magnetic saturation degree is alleviated, and the torque density and overload capacity of the motor are improved.

[0091] There may be multiple permanent magnet slots 103 . Generally, the multiple permanent magnet slots 103 are evenly arranged around the axis of the rotor core 102 .

[0092] Among them, the extension direction of the permanent magnet slot 103 can be the axial direction of the rotor core 102, or it can be a direction with a certain twist angle to the axial direction (that is, oblique pole). Of course, considering the processing cost and difficulty, a segmented twisting method can be used for approximation.

[0093] It can be understood that for the rotor core 102, the permanent magnet slots 103 and the outer edge of the rotor core 102 are located in two directions. Therefore, by limiting the two ends of the extension slot 106 to face the permanent magnet 104 and the outer edge of the rotor core 102 respectively, the extension slot 106 itself will bend to a certain extent.

[0094] The extension slot 106 mainly includes two parts, such as Figure 3 and Figure 4 As shown, the first slot segment 1062 and the second slot segment 1064 are connected, wherein the ends of the first slot segment 1062 and the second slot segment 1064 facing away from each other are respectively oriented toward the permanent magnet slot 103 and the outer edge of the rotor core 102. The two parts of the extended slot 106 are respectively oriented toward different positions of the structure, and the two parts need to be connected. Under the joint action of the two parts, the quadrature-axis armature reaction of the motor can be effectively suppressed, thereby alleviating the degree of magnetic saturation.

[0095] Furthermore, the extension direction of the first slot segment 1062 and the second slot segment 1064 is restricted, which can effectively suppress the quadrature-axis armature reaction of the motor and alleviate the degree of magnetic saturation under the action of the magnetic barrier, thereby improving the power density and torque density of the motor and enhancing the overload capacity of the motor. Specifically, the cross-section of the rotor core 102 is the normal plane to the axis of the rotor core 102. On this cross-section, the extension direction of the first slot segment 1062 and the extension direction of the permanent magnet slot 103 can be orthogonal or approximately orthogonal, and the specific angle between the two can range from 60° to 120°. Of course, on this cross-section, the extension direction of the second slot segment 1064 and the rotation direction of the rotor core 102 can be orthogonal or approximately orthogonal, and the specific angle between the two can range from 60° to 120°.

[0096] In a specific embodiment, the first slot segment 1062 and the second slot segment 1064 are connected to each other, and the transition between the first slot segment 1062 and the second slot segment 1064 can be smoothed by limiting the transition, thereby reducing the processing difficulty and processing cost.

[0097] It can be understood that the smooth transition between the first slot segment 1062 and the second slot segment 1064 is a curved transition. When a certain angle is formed between the first slot segment 1062 and the second slot segment 1064, if the slot widths of the two slot segments are the same, it can also be an arc transition.

[0098] Example 3

[0099] like Figures 1 to 4 As shown, a rotor structure 100 proposed in this embodiment includes a rotor core 102 and a permanent magnet 104 disposed within the rotor core 102, so that the rotor structure 100 can be driven by the magnetic action of the permanent magnet 104 and can rotate relative to the stator 202 to achieve normal operation of the motor. Specifically, a permanent magnet slot 103 is provided on the rotor core 102, and the permanent magnet 104 can be disposed within the permanent magnet slot 103, which can facilitate the permanent magnet 104 to be driven by magnetic force. An extension slot 106 is also provided on the rotor core 102. By limiting the extension direction of the two ends of the extension slot 106 to be toward the permanent magnet 104 and the outer edge, the extension slot 106 can be used as a structure to alleviate the degree of magnetic saturation, forming a magnetic barrier in the rotor structure 100, thereby improving the power density and torque density of the motor and enhancing the overload capacity of the motor.

[0100] Among them, the extended slot 106 mainly includes two parts, namely the first slot segment 1062 and the second slot segment 1064. The first slot segment 1062 and the second slot segment 1064 are connected, wherein the ends of the first slot segment 1062 and the second slot segment 1064 that are opposite to each other are respectively facing the permanent magnet slot 103 and the outer edge of the rotor core 102. The two parts of the extended slot 106 are respectively facing structures at different positions, and the two parts need to be connected. Under the joint action of the two parts, the quadrature-axis armature reaction of the motor can be effectively suppressed, thereby alleviating the effect of the degree of magnetic saturation.

[0101] Regarding the first slot segment 1062, in one embodiment, one end of the first slot segment 1062 facing the permanent magnet slot 103 is directly connected to the permanent magnet slot 103. In terms of structure, the first slot segment 1062 is directly connected to the permanent magnet slot 103 to achieve the effect of suppressing the quadrature-axis armature reaction of the motor.

[0102] In another embodiment, the end of the first slot segment 1062 facing the permanent magnet slot 103 is not connected to the permanent magnet slot 103, that is, there is a certain distance between the two. For the extension slot 106 as a whole, one end thereof is a closed structure, and in terms of structure, there is a certain distance between the first slot segment 1062 and the permanent magnet slot 103, which can also achieve the effect of suppressing the cross-axis armature reaction of the motor while ensuring the integrity of the punching sheet as much as possible.

[0103] The first distance between the first slot segment 1062 and the permanent magnet slot 103 is greater than 0.2 mm.

[0104] Regarding the second slot segment 1064 , in one embodiment, one end of the second slot segment 1064 facing the outer edge is directly connected to the outer edge. Structurally, the second slot segment 1064 is directly connected to the outer edge to achieve the effect of suppressing the quadrature-axis armature reaction of the motor.

[0105] In another embodiment, the end of the second slot segment 1064 facing the outer edge is not connected to the outer edge, that is, there is a certain distance between the two. For the extension slot 106 as a whole, one end thereof is a closed structure, and in terms of structure, there is a certain distance between the second slot segment 1064 and the outer edge, which can also achieve the effect of suppressing the cross-axis armature reaction of the motor while ensuring the integrity of the punching sheet as much as possible.

[0106] The second distance between the second groove section 1064 and the outer edge is greater than 0.2 mm.

[0107] It should be emphasized that there are four combinations of connection relationships between the first slot segment 1062 and the second slot segment 1064 and the permanent magnet slot 103 and the outer edge respectively, specifically: the first slot segment 1062 is connected, and the second slot segment 1064 is not connected; the first slot segment 1062 is connected, and the second slot segment 1064 is connected; the first slot segment 1062 is not connected, and the second slot segment 1064 is connected; the first slot segment 1062 is not connected, and the second slot segment 1064 is not connected.

[0108] There are multiple permanent magnet slots 103 provided on the rotor core 102 . The connection relationship between the first slot segment 1062 and the second slot segment 1064 of each permanent magnet slot 103 is independent, so the arrangement can be flexibly selected according to actual needs.

[0109] like Figure 2 As shown, some of the extension slots 106 have disconnected first slot sections 1062 and connected second slot sections 1064, while another portion of the extension slots 106 have connected first slot sections 1062 and disconnected second slot sections 1064. The two types of extension slots 106 with different connection relationships are alternately arranged.

[0110] like Figure 6 As shown, both ends of the extension slot corresponding to the second slot body 1034 are not connected.

[0111] like Figure 7 As shown, the first slot sections 1062 of all the extension slots 106 are not connected, but the second slot sections 1064 are connected.

[0112] like Figure 8 As shown, some of the extension slots 106 have disconnected first slot sections 1062 and disconnected second slot sections 1064, while another portion of the extension slots 106 have connected first slot sections 1062 and disconnected second slot sections 1064. The two types of extension slots 106 with different connection relationships are alternately arranged.

[0113] like Figure 9 As shown, the first slot sections 1062 of all the extension slots 106 are connected, while the second slot sections 1064 are not connected.

[0114] like Figure 10 As shown, some of the extension slots 106 have connected first slot sections 1062 and connected second slot sections 1064, while another portion of the extension slots 106 have connected first slot sections 1062 and disconnected second slot sections 1064. The two types of extension slots 106 with different connection relationships are alternately arranged.

[0115] like Figure 11 As shown, some of the extension slots 106 have connected first slot sections 1062 and connected second slot sections 1064, while another portion of the extension slots 106 have disconnected first slot sections 1062 and connected second slot sections 1064. The two types of extension slots 106 with different connection relationships are alternately arranged.

[0116] like Figure 12 As shown, the first slot sections 1062 and the second slot sections 1064 of all the extension slots 106 are connected.

[0117] Example 4

[0118] like Figures 1 to 4 As shown, a rotor structure 100 proposed in this embodiment includes a rotor core 102 and a permanent magnet 104 disposed within the rotor core 102, so that the rotor structure 100 can be driven by the magnetic action of the permanent magnet 104 and can rotate relative to the stator 202 to achieve normal operation of the motor. Specifically, a permanent magnet slot 103 is provided on the rotor core 102, and the permanent magnet 104 can be disposed within the permanent magnet slot 103, which can facilitate the permanent magnet 104 to be driven by magnetic force. An extension slot 106 is also provided on the rotor core 102. By limiting the extension direction of the two ends of the extension slot 106 to be toward the permanent magnet 104 and the outer edge, the extension slot 106 can be used as a structure to alleviate the degree of magnetic saturation, forming a magnetic barrier in the rotor structure 100, thereby improving the power density and torque density of the motor and enhancing the overload capacity of the motor.

[0119] According to the rotor structure 100 of this solution, the quadrature-axis armature reaction of the motor is effectively suppressed, the magnetic saturation degree is alleviated, and the torque density and overload capacity of the motor are improved.

[0120] For the permanent magnet slot 103, it can include a first slot body 1032 and a second slot body 1034 that are connected, or a first slot body 1032 and a second slot body 1034 with a magnetic bridge gap between the slots, wherein at least one of the radial size and the tangential size of the two slot bodies is different, so as to accommodate permanent magnets 104 of different sizes or different magnetic capacities. Specifically, the radial size of the first slot body 1032 and the second slot body 1034 can be different, or the tangential size of the first slot body 1032 and the second slot body 1034 can be different. Alternatively, the radial size and tangential size of the first slot body 1032 and the second slot body 1034 can be different.

[0121] In addition, there may be an inter-slot magnetic bridge gap with a narrowest width of less than 3 mm between the first slot body 1032 and the second slot body 1034. Since the first slot body and the second slot body are not connected, the connection strength is high during rotation and the operation is relatively stable.

[0122] It can be understood that when the volume of the magnet is different, its magnetic capacity will change accordingly.

[0123] And then, as Figure 1As shown, the permanent magnets 104 arranged in the permanent magnet slots 103 also include two types, specifically the first magnet 1042 and the second magnet 1044. By respectively arranging the first magnet 1042 and the second magnet 1044 with different magnetic properties in the first slot body 1032 and the second slot body 1034, it is convenient to cooperate with slot bodies of different sizes to make full use of the space of the rotor core 102 and meet the performance requirements of the rotor structure 100.

[0124] The difference in magnetic properties between the two may be in the form of different volumes, different magnetic materials, or even different shapes.

[0125] In a specific embodiment, further limiting the dimensions of the first slot body 1032 and the second slot body 1034 can improve coordination with the extension slot 106. Specifically, the extension slot 106 can vary in shape depending on the differences between the first slot body 1032 and the second slot body 1034. Specifically, the first slot body 1032 is relatively large, while the magnetic energy product of the first magnet 1042 located within the first slot body 1032 is relatively small. This minimizes the difference in magnetic effect between the first magnet 1042 and the second magnet 1044, ensuring stability of the rotor structure 100 during rotation and the stability of the motor's power output during operation.

[0126] The dimensions of the tank body include but are not limited to radial dimensions and tangential dimensions.

[0127] It can be understood that the larger the magnetic energy product, the less magnetic material is required to produce the same effect, that is, the smaller the volume.

[0128] In a specific embodiment, the first slot body 1032 is arranged radially inside the second slot body 1034, that is, in the radial direction of the rotor core 102, the first slot body 1032 is arranged inwardly, so that the size of the inner magnet is larger and the size of the outer magnet is smaller, which can effectively reduce leakage magnetic flux and improve the sinusoidal degree of the air gap magnetic density.

[0129] Of course, since there are generally multiple permanent magnet slots 103 , each permanent magnet slot 103 includes a first slot body 1032 and a second slot body 1034 .

[0130] In another specific embodiment, Figure 13 As shown, each permanent magnet slot 103 is composed of a first slot body 1032 and two second slot bodies 1034. The larger first slot body 1032 is located in the middle, and a smaller second slot body 1034 is provided on both sides of the extension direction of the first slot body 1032. For different slot bodies, they can be connected to one end of the extension slot 106 or spaced apart to achieve the effect of suppressing the quadrature-axis armature reaction of the motor.

[0131] In addition, the first slot body 1032 and the second slot body 1034 are radially arranged on the rotor core, which can realize parallel connection of magnetic circuits and increase the magnetic load of the motor.

[0132] Example 5

[0133] like Figure 14 and Figure 15 As shown, a motor structure 200 proposed in this embodiment includes a stator 202 and a rotor structure 100. The rotor structure 100 can rotate relative to the stator 202. The motor structure 200 is provided with the rotor structure 100 of any of the above embodiments, so it has the beneficial effects of any of the above embodiments, which will not be repeated here.

[0134] It should be emphasized that since the motor structure 200 includes the above-mentioned rotor structure 100, on the one hand, it effectively suppresses the quadrature-axis armature reaction of the motor, alleviates the degree of magnetic saturation, and improves the torque density and overload capacity of the motor; on the other hand, it can also weaken the magnetic field harmonics of the rotor in the air gap 204 and improve the torque pulsation of the motor.

[0135] Example 6

[0136] The present application also provides a specific permanent magnet combined reverse salient pole rotor, permanent magnet 104 and rotor core 102. Permanent magnet 104 is divided into two types, permanent magnet 104A (i.e., second magnet 1044) and permanent magnet 104B (i.e., first magnet 1042). Permanent magnet 104A and permanent magnet 104B have different magnetic properties, or use different permanent magnet materials. Permanent magnet slots 103 and extension slots 106 are provided on the rotor core 102. Permanent magnet slots 103 are divided into two types, permanent magnet slots 103A (i.e., second slot body 1034) and permanent magnet slots 103B (i.e., first slot body 1032). Permanent magnet 104A is placed in the permanent magnet slot 103A on the rotor core 102, and permanent magnet 104B is placed in the permanent magnet slot 103B on the rotor core 102. The ends of the extended slots 106 on the rotor core 102 point toward the motor air gap 204 (i.e., the outer edge of the rotor core 102) and toward either the permanent magnet slots 103A or the permanent magnet slots 103B, respectively. The rotor core 102 is constructed from laminated silicon steel sheets. The punchings 1022 of the rotor core 102 include extended slots 106. One end of the extended slots 106 points toward the permanent magnet slots 103, and the other end points toward the outer circumference of the rotor core 102.

[0137] Permanent magnet slot A is embedded with permanent magnet A having a higher magnetic energy product, and the magnetizing direction (tangential direction) of permanent magnet slot A is shorter and the radial length is shorter; permanent magnet slot B is embedded with permanent magnet B having a lower magnetic energy product, and the magnetizing direction (tangential direction) of permanent magnet slot B is longer and the radial length is longer.

[0138] The permanent magnet slot A and the permanent magnet slot B are arranged in the radial direction to ensure that the magnetization directions of the permanent magnets 104 in the two slots are parallel to the running direction of the rotor (tangential magnetization).

[0139] The permanent magnet slots A are distributed on the radial outside, and the permanent magnet slots B are distributed on the radial inside.

[0140] The permanent magnet slots 103 are perpendicular to the rotation direction of the rotor core 102 . The permanent magnets 104 are embedded in the permanent magnet slots 103 . The rotor core 102 is divided into 2P sector-shaped areas, which are the number of motor poles, by the permanent magnet slots 103 .

[0141] The rotor core 102 is characterized in that the permanent magnet slots 103 are shaped like a centrosymmetric polygon.

[0142] According to one embodiment of the present invention, one end of the extension slot 106 points toward the permanent magnet slot 103 and extends in a direction perpendicular or approximately perpendicular to the permanent magnet slot 103, while the other end points toward the outer circumference of the punching sheet 1022 of the rotor core 102 and extends in a direction perpendicular or approximately perpendicular to the rotor's running direction. The term "approximately perpendicular" here refers to an angle between 60° and 120°.

[0143] According to one embodiment of the present invention, all the extension slots 106 on both sides of the permanent magnet slot 103 of each pole are not connected to the permanent magnet slot 103, and at least one extension slot 106 on the radially outer side of each sector-shaped area of the rotor core 102 is connected to the air gap 204; or at least one extension slot 106 on both sides of the permanent magnet slot 103 of each pole is connected to the permanent magnet slot 103, and all the extension slots 106 on the radially outer side of each sector-shaped area of the rotor core 102 are not connected to the air gap 204.

[0144] If any end of the extension slot 106 on the rotor core 102 is in a disconnected state (not connected to the permanent magnet slot 103 and the air gap 204 ), the distance d between the end and the permanent magnet slot 103 or the outer surface of the rotor is greater than 0.2 mm.

[0145] In this specific embodiment, the motor overload capacity can be effectively improved and the torque ripple and cost of the motor can be reduced by simply designing multiple layers of cross-axis magnetic barriers on the rotor core 102 and using at least one relatively cheap permanent magnetic material for the permanent magnet 104 combination design.

[0146] The rotor structure, motor structure and compressor provided by the present invention, on the one hand, effectively suppress the quadrature-axis armature reaction of the motor, alleviate the degree of magnetic saturation and reduce the load back electromotive force, thereby improving the torque density and overload capacity of the motor; on the other hand, since the rotor core is hollowed out to form an extended slot, the amount of rare earth permanent magnets used can also be reduced.

[0147] In the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless expressly limited otherwise. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0148] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0149] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0150] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A rotor structure, characterized in that: include: a rotor core, wherein permanent magnet slots are formed on the rotor core, the permanent magnet slots being arranged on the rotor core along a radial direction of the rotor core, the number of the permanent magnet slots being multiple, and the rotor core being divided into a plurality of sector-shaped areas by the permanent magnet slots; a permanent magnet, disposed in the permanent magnet slot; a plurality of extension slots, provided on the rotor core, with two ends of the plurality of extension slots facing the permanent magnet and the outer edge of the rotor core respectively; The extension groove specifically includes: a first slot segment extending toward the permanent magnet slot; a second slot segment, connected to the first slot segment, and extending toward an outer edge of the rotor core; On the cross section of the rotor core, the angle between the extension direction of the first slot segment and the extension direction of the permanent magnet slot is 60° to 120°; On the cross section of the rotor core, the angle between the extension direction of the second slot segment and the rotation direction of the rotor core is 60° to 120°; In each of the sector-shaped areas, among the multiple extension slots facing the same permanent magnet, the first slot segments of some of the extension slots are not connected and the second slot segments are connected, while the first slot segments of another part of the extension slots are connected and the second slot segments are not connected, and the two types of extension slots with different connection relationships are alternately arranged.

2. The rotor structure according to claim 1, characterized in that: The first slot section and the second slot section are smoothly transitioned and connected.

3. The rotor structure according to claim 1, characterized in that: A first distance exists between an end of the first slot segment away from the second slot segment and the permanent magnet slot.

4. The rotor structure according to claim 3, characterized in that: The first spacing is greater than 0.2 mm.

5. The rotor structure according to claim 1, characterized in that: A second distance exists between an end of the second slot segment away from the first slot segment and an outer edge of the rotor core.

6. The rotor structure according to claim 5, characterized in that: The second distance is greater than 0.2 mm.

7. The rotor structure according to any one of claims 1 to 6, characterized in that: The rotor core specifically comprises: Multiple stacked sheets, Wherein, each punching sheet is provided with an assembly opening, and a plurality of the assembly openings form the permanent magnet slot.

8. The rotor structure according to any one of claims 1 to 6, characterized in that: The permanent magnet slot specifically includes: a first tank body; The second slot body is connected to the first slot body or there is an inter-slot magnetic bridge gap between the second slot body and the first slot body. The minimum width of the inter-slot magnetic bridge interval is less than 3 mm, the radial dimension of the first slot body is different from the radial dimension of the second slot body, and / or the tangential dimension of the first slot body is different from the tangential dimension of the second slot body.

9. The rotor structure according to claim 8, characterized in that: include: A first magnet is disposed in the first slot; The second magnet is disposed in the second slot. The magnetic properties of the second magnet are different from those of the first magnet.

10. The rotor structure according to claim 9, characterized in that: The radial dimension of the first slot body is greater than the radial dimension of the second slot body, and the tangential dimension of the first slot body is greater than the tangential dimension of the second slot body. Wherein, the magnetic energy product of the first magnet is smaller than the magnetic energy product of the second magnet.

11. The rotor structure according to claim 10, characterized in that: In the radial direction of the rotor core, the first slot body is arranged on the inner side of the second slot body.

12. The rotor structure according to claim 10, characterized in that: In the radial direction of the rotor core, a second slot body is provided on both sides of each first slot body.

13. The rotor structure according to claim 8, characterized in that The first slot body and the second slot body are arranged on the rotor core along a radial direction of the rotor core.

14. The rotor structure according to any one of claims 1 to 6, characterized in that: The cross section of the rotor core is circular, the number of the permanent magnet slots is an even number, and the rotor core is divided into an even number of sector-shaped areas by the permanent magnet slots. The number of the permanent magnet slots is the same as the number of the sector-shaped areas.

15. A motor structure, characterized in that: include: stator; The rotor structure according to any one of claims 1 to 14 is coaxially arranged with the stator, and the rotor structure is rotatable relative to the stator.

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