Rotor structure, motor and compressor

Abstract

A rotor structure (202), a motor (200), and a compressor, wherein the rotor structure (202) includes a plurality of rotor core sheets (204), a first magnet (2082), and a second magnet (2084), the plurality of rotor core sheets (204) being stacked and installed, and each rotor core sheet (204) being provided with an axial hole (214), and a first mounting groove (2062) and a second mounting groove (2064) uniformly provided around the circumference so as to surround the axis of the axial hole (214), the shape of the first mounting groove (2062) being different from the shape of the second mounting groove (2064), and the circumferential position of the first mounting groove (2062) being different from the circumferential position of the second mounting groove (2064). The first magnet (2082) is provided in the first mounting groove (2062), and the second magnet (2084) is provided in the second mounting groove (2064). Here, the diameter of the shaft hole (214) is the fourth radial size, the shortest distance between the first mounting groove (2062) and the axis is the fourth size, and the range of the ratio between the fourth size and the fourth radial size is greater than 1 and less than 1.2. The technical solution of the present invention can improve the efficiency of the motor.

Description

Technical Field

[0001] The present application claims the priority of the Chinese patent application filed with the China National Intellectual Property Administration on October 08, 2023, with the application number "202311292915.X" and the title of the application being "Rotor Structure, Motor and Compressor", the entire content of which is incorporated into the present application by reference.

[0002] The present application relates to the technical field of motors, and specifically, to a rotor structure, a motor and a compressor.

Background Art

[0003] At present, in order to meet different load demands, a certain strength is required for the rotor structure of a ferrite permanent magnet motor, and the rotor needs to support the rotor permanent magnets while ensuring the integral physical strength of the rotor core. In the prior art, rotor support beams with small sizes are usually provided between the permanent magnets inside the rotor, holes are opened between the poles of the permanent magnets to reduce leakage flux, and the support beams are located between the holes. The rotor support beams ensure the integral forming and physical strength of the rotor core sheets, but provide a leakage flux magnetic path between adjacent poles of the permanent magnets, as a result, the amplitude of the air-gap magnetic field is attenuated, and the copper loss of the motor is increased. In addition, since the direct-axis inductance of the motor structure is large, there is a high risk of demagnetization.

Summary of the Invention

[0004] The present application aims to at least solve one of the technical problems existing in the prior art or related art.

[0005] In view of this, an embodiment of the first aspect of the present application provides a rotor structure.

[0006] An embodiment of the second aspect of the present application provides a motor.

[0007] An embodiment of the third aspect of the present application provides a compressor.

[0008] To achieve the above objective, an embodiment of the first aspect of the present application provides a rotor structure comprising a plurality of rotor core sheets stacked and installed, each rotor core sheet having a shaft hole and a first mounting groove and a second mounting groove uniformly provided on the circumference surrounding the axis of the shaft hole, wherein the shape of the first mounting groove is different from the shape of the second mounting groove, and the circumferential position of the first mounting groove is different from the circumferential position of the second mounting groove. A first magnet is provided in the first mounting groove, and a second magnet is provided in the second mounting groove, the diameter of the shaft hole is a fourth radial size, the shortest distance between the first mounting groove and the axis is a fourth size, and the range of the ratio of the fourth size to the fourth radial size is greater than 1 and less than 1.2.

[0009] In some technical proposals, the ratio of the fourth size to the fourth radial size is typically in the range of 1.01 to 1.2.

[0010] In some technical proposals, the cross-sectional shape of the second magnet is, for example, a rectangle and a trapezoid connected radially, with the longer side of the rectangle connected to the lower base of the trapezoid, and the size of the longer side of the rectangle being twice the size of the upper base of the trapezoid.

[0011] In some technical proposals, the angle between the side and top base of a trapezoid is typically between 0° and 90°.

[0012] In some technical proposals, the ratio of the shorter side of a rectangle to the upper base of a trapezoid is typically between 0.8 and 0.95.

[0013] In some technical proposals, the ratio of the length of the rectangle to the opening size at one end away from the axis of the second mounting groove is typically between 1.3 and 1.35.

[0014] In some technical proposals, the rotor structure exemplifies further including mounting holes provided in the rotor core sheet, and end plates provided at both axial ends of a plurality of rotor core sheets, each connected to the rotor core sheet via the mounting holes.

[0015] An embodiment of the second aspect of the present application provides a motor comprising the rotor structure of the embodiment of the first aspect described above, and a stator structure installed coaxially with the rotor structure. Accordingly, the motor according to the present application has all the beneficial effects of the rotor structure according to any of the above technical proposals.

[0016] In some technical proposals, the radial size of the air gap between the rotor structure and the stator structure is exemplified as the first air gap size, the diameter of the third virtual circle corresponding to the outer edge of the rotor core seat is exemplified as the third radial size, and the difference between the second radial size and the third radial size is twice the first air gap size.

[0017] In some technical proposals, the rotor structure exemplifies further including an arc-shaped notch provided on the outer edge of the rotor core sheet, wherein the center of the arc-shaped notch does not coincide with the axis, and the ratio of the radius of the arc-shaped notch to the third radial size is in the range of 0.15 to 0.35.

[0018] In some technical proposals, the ratio of the width of the first mounting groove to the difference between the third radial size and twice the fourth size is typically in the range of 0.15 to 0.3.

[0019] A third embodiment of the present application provides a compressor comprising either a rotor structure of the first embodiment or a motor of the second embodiment.

[0020] Additional aspects and advantages of this application will become apparent in the following description or will be understood through the practice of this application. [Brief explanation of the drawing]

[0021] [Figure 1] Figure 1 is a schematic diagram showing a stator structure according to one embodiment of the present invention. [Figure 2] Figure 2 is a schematic diagram showing the structure of a motor according to one embodiment of the present invention. [Figure 3] Figure 3 is a schematic diagram showing the structure of a motor according to one embodiment of the present invention. [Figure 4]FIG. 4 is a schematic cross-sectional structural view showing a rotor structure according to an embodiment of the present application. [Figure 5] FIG. 5 is a schematic structural view showing a motor according to an embodiment of the present application. [Figure 6] FIG. 6 is a schematic structural view showing a motor according to an embodiment of the present application. [Figure 7] FIG. 7 is a schematic structural view showing a motor according to an embodiment of the present application. [Figure 8] FIG. 8 is an enlarged schematic structural view of part A in FIG. 7. [Figure 9] FIG. 9 is a schematic diagram showing the efficiency improvement effect according to an embodiment of the present application. [Figure 10] FIG. 10 shows the demagnetization state of a permanent magnet according to an embodiment of the present application. [Mode for Carrying Out the Invention]

[0022] For a clearer understanding of the above objects, features and advantages of the above embodiments of the present application, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings and specific implementations. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other where there is no conflict.

[0023] In the following description, numerous specific details are set forth to provide a thorough understanding of the present application. However, the embodiments of the present application can be implemented in other modes different from those described herein, so the protection scope of the present application is not limited to the specific embodiments disclosed below.

[0024] Hereinafter, several embodiments of the present application will be described with reference to FIG. 1 to FIG. 10.

[0025] One embodiment of the present invention provides a rotor structure comprising a plurality of rotor core sheets 204. Each core sheet is provided with a shaft hole 214 and first mounting grooves 2062 and second mounting grooves 2064 uniformly distributed around the shaft hole 214. These special designs are for mounting magnets in different positions, such as a first magnet 2082 and a second magnet 2084, thereby forming the magnetic field required for the motor 200. The first magnet 2082 and the second magnet 2084 are located in the first mounting grooves 2062 and the second mounting grooves 2064, respectively. Specifically, the permanent magnets of the motor 200 drive the rotation of the motor 200 by generating a magnetic field and interacting with the magnetic field of the stator. The mounting method and position of the first magnet 2082 and the second magnet 2084 may affect the output power, efficiency, and performance of the motor 200. The shaft hole is for connecting the rotor to the shaft of the motor 200, and the two types of mounting grooves are used for mounting the magnets. The design of these holes and grooves can affect the structural strength, magnetic field distribution, and magnetic flux density of the rotor. This solution primarily limits the size to a fourth size. In some embodiments, the ratio of the shortest distance between the first mounting groove 2062 and the axis to the diameter of the shaft hole is 1 to 1.2 and does not include the endpoints. These size parameters can be important design parameters of the stator and rotor structure 202. They relate to the diameter of the shaft hole, the position of the mounting groove, and the magnetic field distribution, etc. By rationally setting these parameters, it is possible to contribute to achieving the required magnetic field characteristics and mechanical strength.

[0026] Here, the stator structure 100 is the static part of the motor 200 and includes a plurality of stator core sheets 102. The design of these core sheets has several special attributes, such as the shape and size of the stator teeth. These special attributes can affect the magnetic field distribution of the stator, the magnetic flux density, and the efficiency and performance of the motor 200.

[0027] The rotor structure 202 is the rotating part of the motor 200 and is installed coaxially with the stator structure 100.

[0028] Based on one embodiment, the rotor structure 202 exemplary includes a plurality of rotor core sheets 204, each core sheet having a shaft hole and first and second mounting grooves 2062 and 2064 uniformly distributed around the shaft hole. These special designs are for mounting magnets in different positions, such as the first magnet 2082 and the second magnet 2084, thereby forming the magnetic field required for the motor 200. The first magnet 2082 and the second magnet 2084 are located in the first and second mounting grooves 2062 and 2064, respectively. Specifically, the permanent magnets of the motor 200 drive the rotation of the motor 200 by generating a magnetic field and interacting with the magnetic field of the stator. The mounting method and position of the first magnet 2082 and the second magnet 2084 may affect the output power, efficiency, and performance of the motor 200. The shaft hole is for connecting the rotor to the shaft of the motor 200, and the two types of mounting grooves are used for mounting the magnets. The design of these holes and grooves can affect the structural strength, magnetic field distribution, and magnetic flux density of the rotor. This solution primarily limits the size to a fourth size. In some embodiments, the ratio of the shortest distance between the first mounting groove 2062 and the axis to the diameter of the shaft hole is 1 to 1.2 and does not include the endpoints. These size parameters can be important design parameters of the stator and rotor structure 202. They relate to the diameter of the shaft hole, the position of the mounting groove, and the magnetic field distribution, etc. By rationally setting these parameters, it is possible to contribute to achieving the required magnetic field characteristics and mechanical strength.

[0029] In short, the settings of the above parameters directly affect the performance, efficiency, and stability of motor 200.

[0030] Based on any of the embodiments, the efficiency of the motor 200 can be improved by, for example, limiting the ratio of the fourth size to the fourth radial size to 1.01 to 1.2 and specifying the relationship between the shaft hole diameter in the rotor core seat 204 and the mounting groove surrounding the shaft hole, thereby meeting the need for efficient operation in the variable frequency and full speed range.

[0031] Based on one embodiment, the cross-sectional shape of the second magnet 2084 is exemplary, consisting of a radially connected rectangle and trapezoid. The longer side of the rectangle is connected to the lower base of the trapezoid. By limiting the size of the longer side of the rectangle to twice the size of the upper base of the trapezoid, the second magnet 2084 and the first magnet 2082 are positioned as sufficiently as possible on the rotor core sheet 204, thereby improving the motor's performance.

[0032] Based on one of the embodiments, the magnetic field distribution and magnetic performance are adjusted and the magnetization direction of the permanent magnet is influenced by restricting the range of the angle formed by the side and top base of the trapezoid to 0° to 90°.

[0033] Based on any of the embodiments, exemplary, the ratio of the shorter side size of the rectangle to the upper base size of the trapezoid is in the range of 0.8 to 0.95, thereby adjusting the magnetic field distribution and influencing the magnetic properties and magnetic field strength, thereby meeting the need for efficient operation across the variable frequency and full speed range.

[0034] Based on any of the embodiments, the ratio of the length of the rectangle to the opening size at one end of the second mounting groove 2064 away from the axis is limited to a range of 1.3 to 1.35. This affects the mounting position of the permanent magnets in the rotor core sheet 204, and further affects the efficiency and performance of the motor 200, thereby meeting the need for efficient operation across the variable frequency and full speed range.

[0035] Based on one embodiment, for example, mounting holes 210 are provided in the rotor core sheet 204, and end plates 212 are provided at both axial ends of a plurality of rotor core sheets 204, with each end plate connected to the rotor core sheet 204 via the mounting holes. These components are used to fix and connect the magnets and rotor core sheets 204, ensuring their stability during high-speed operation.

[0036] As shown in Figure 1, the stator structure 100 according to this embodiment is mainly composed of stacking a plurality of stator core sheets 102. The stator structure 100 is made up of a plurality of stacked stator core sheets 102. These stator core sheets 102 are stacked along the vertical axis and constitute the entire stator. Each stator core sheet 102 includes a stator yoke 104 and a plurality of stator teeth 106. The stator teeth 106 are distributed on the stator yoke 104, thereby uniformly distributed around the axis of the stator structure. Winding grooves 108 are formed between any two adjacent stator teeth 106, and these grooves are used to position the winding coils 110. One end of each of the plurality of stator teeth 106 away from the stator yoke 104 forms a first virtual circle with a diameter of the first radial size. Similarly, one end of each winding groove 108 away from the stator yoke 104 forms a second virtual circle with a diameter of the second radial size. Furthermore, by limiting the two radial sizes, specifically by making the second radial size (diameter of the second virtual circle) larger than half the first radial size (diameter of the first virtual circle), it is possible to achieve an optimized magnetic field distribution and motor performance, enabling efficient operation of the motor 200 system across the entire speed range, and the motor 200 also possesses high resistance to irreversible demagnetization.

[0037] To make it clear, the second virtual circle is the inner circle of the stator structure 100, which is used to position the rotor structure 202, and the first virtual circle is the circle formed from the portion of the stator yoke 104.

[0038] Overall, the stator structure 100 aims to optimize the magnetic field distribution of the motor 200 and improve the motor's performance by stacking and installing stator core sheets 102, designing the distribution of stator teeth 106 and winding grooves 108, and considering the radial size relationship of virtual circles. Such a structure has advantages in improving the efficiency, stability, and output performance of the motor 200.

[0039] Based on any one embodiment, the ratio of the second radial size to the first radial size is typically in the range of 0.55 to 0.65. By limiting this ratio range, specific magnetic field distributions and motor performance can be achieved. A larger second radial size can have a certain effect on the air gap magnetic field. In some cases, this can contribute to improving the efficiency, power output, and stability of the motor 200.

[0040] Based on any one embodiment, the sizes of the stator core sheet 102 in two directions are, for example, a first size and a second size. If the stator core sheet 102 is substantially rectangular, the first size and the second size correspond to the length and width. In some embodiments, the size of the stator core sheet 102 in the first direction is the first size. The size of the stator core sheet 102 in the second direction perpendicular to the first direction is the second size. The range of the ratio of the first radial size to the sum of the first and second sizes is 0.425 to 0.475. The above limitations can improve performance parameters such as the efficiency and output power of the motor 200.

[0041] Based on one embodiment, exemplary, the shape of the stator teeth 106 is such that one end away from the stator yoke 104 is arc-shaped, which optimizes the magnetic field distribution and reduces problems such as leakage flux, thereby improving the efficiency and performance of the motor 200. The arc shape affects the magnetic field characteristics and mechanical structure of the stator teeth 106, and further affects the operation of the motor 200.

[0042] Exemplary, based on one of the embodiments, the structure of the stator tooth 106 consists of two parts: a tooth body and a tooth shoe. In some embodiments, the tooth body structure is connected to the stator yoke 104, and the tooth shoe structure 1064 is provided at the other end of the tooth body structure 1062. By limiting the width of the tooth body structure 1062 to 0.2 to 0.3 times the first radial size, it is possible to easily improve the performance of the motor.

[0043] Based on one of the embodiments, the symmetry of the stator teeth 106 is defined exemplary. Specifically, it is symmetric with respect to the angle bisector of the angle formed by the circumferential ends of the tooth shoe structure 1064 and the center of the stator core sheet 102, thereby stabilizing the magnetic field distribution of the motor 200 and improving stability under operating conditions.

[0044] Based on any of the embodiments, by exemplary limiting the width of the tooth body structure 1062, the size of the width of the tooth body structure 1062 affects the magnetic field distribution and magnetic flux density of the motor 200. Limiting the width to 0.25 times the first radial size contributes to achieving the required magnetic field strength, thereby ensuring that the motor 200 operates efficiently under different loads and speeds.

[0045] Based on any of the embodiments, by exemplary limiting the angle of the side wall, specifically limiting it to 85° to 105° which is approximately vertical, the stability of the statutory teeth can be enhanced, the required magnetic field distribution can be obtained, and the motor performance can be further improved.

[0046] Based on any of the embodiments, by specifically limiting the angle between the side wall connected to the tooth body structure in the tooth shoe structure and the direction perpendicular to the axis of symmetry of the winding groove 108 to 10° to 20°, the tooth shoe can be stably held during the operation of the motor 200, thereby contributing to maintaining the structural integrity of the entire motor 200.

[0047] Another embodiment of the present invention provides a motor 200 comprising the rotor structure 202 of the first embodiment described above and a stator structure 100 installed coaxially with the rotor structure 202. Thus, it has all the beneficial effects of the stator structure 100 according to any of the embodiments described above.

[0048] In this embodiment, the rotor structure may be any structure.

[0049] Based on any one embodiment, exemplary, the first air gap size is the radial size of the air gap between the rotor structure 202 and the stator structure 100. The diameter size of the third virtual circle corresponds to the outer edge of the rotor core sheet 204. By limiting the difference between the second radial size and the third radial size to twice the first air gap size, the magnetic field distribution and air gap size between the stator and rotor can be influenced. This further influences the efficiency and performance of the motor 200, thereby meeting the need for efficient operation across the variable frequency and full speed range.

[0050] Based on one of the embodiments, as shown in Figure 7, the arc-shaped notch 216 is positioned on the outer edge of the rotor core sheet 204, and the center of the arc-shaped notch 216 does not coincide with the axis. The ratio of the radius of the arc-shaped notch 216 to the third radial size is in the range of 0.15 to 0.35. This design contributes to reducing the attenuation of the magnetic field strength in the air gap and improving the stability of the magnetic field.

[0051] Based on any of the embodiments, the ratio of the width of the first mounting groove 2062 to the difference between the third radial size and twice the fourth size is limited to a range of 0.15 to 0.3. This range of ratio is the ratio of the width of the first mounting groove 2062 to twice the fourth size. This affects the magnetic field distribution and motor performance in order to provide adequate space when mounting magnets on the rotor core sheet 204.

[0052] Another embodiment of the present invention provides a compressor comprising a rotor structure 202 or a motor 200. Thus, the motor 200 or either of the rotor structures 202 has beneficial effects, which are omitted here in detail.

[0053] In one embodiment, the motor within the compressor includes only the stator structure 100, which is mainly composed of stacking a plurality of stator core sheets 102. The stator structure 100 is made up of stacked stator core sheets 102. These stator core sheets 102 are stacked along a vertical axis and constitute the entire stator. Each stator core sheet 102 includes a stator yoke and a plurality of stator teeth. The stator teeth are distributed on the stator yoke, thereby uniformly distributed around the axis of the stator structure. Winding grooves 108 are formed between any two adjacent stator teeth, and these grooves are used to position windings 110. One end of each of the plurality of stator teeth away from the stator yoke forms a first virtual circle with a diameter of a first radial size. Similarly, one end of each winding groove 108 away from the stator yoke forms a second virtual circle with a diameter of a second radial size. Furthermore, by limiting the two radial sizes, that is, by making the second radial size (diameter of the second virtual circle) larger than half of the first radial size (diameter of the first virtual circle), it is possible to achieve an optimized magnetic field distribution and motor performance, enabling efficient operation of the motor system across the entire speed range, and the motor 200 also has high resistance to irreversible demagnetization.

[0054] In another embodiment, the motor in the compressor includes not only the stator structure described above, but also the rotor structure. The rotor structure includes a plurality of rotor core sheets 204. Each rotor core sheet 204 is provided with a shaft hole and first mounting grooves 2062 and second mounting grooves 2064 uniformly arranged around the shaft hole. These special designs are for mounting magnets in different positions, such as the first magnet 2082 and the second magnet 2084, thereby forming the magnetic field required for the motor 200. The first magnet 2082 and the second magnet 2084 are located in the first mounting grooves 2062 and the second mounting grooves 2064, respectively. Specifically, the permanent magnets of the motor 200 drive the rotation of the motor 200 by generating a magnetic field and interacting with the magnetic field of the stator. The mounting method and position of the first magnet 2082 and the second magnet 2084 may affect the output power, efficiency, and performance of the motor 200. Furthermore, the shaft hole is for connecting the rotor to the shaft of the motor 200, and the two types of mounting grooves are used for mounting magnets. The design of these holes and grooves can affect the structural strength, magnetic field distribution, and magnetic flux density of the rotor. This solution mainly limits the size to a fourth size. In some embodiments, the ratio of the shortest distance between the first mounting groove 2062 and the axis to the diameter of the shaft hole is 1 to 1.2 and does not include the endpoints. These size parameters can be important design parameters of the stator and rotor structure 202. They relate to the diameter of the shaft hole, the position of the mounting grooves, and the magnetic field distribution, etc. By rationally setting these parameters, it is possible to contribute to achieving the required magnetic field characteristics and mechanical strength.

[0055] In one specific embodiment, as shown in Figure 2, the motor 200 consists of a stator structure, windings 110, permanent magnets, and a rotor core. The core sheet size of the stator structure is shown in Figure 1, and is 0.425 × (W1 + H1) <D1<0.475×(W1+H1)、0.55×D1≦D2≦0.65×D1、W2=0.25×D1、85°≦θ1≦100°、10°≦θ2≦20°である。

[0056] A motor mainly consists of a stator, windings, rotor, and permanent magnets. The windings are wound around each stator tooth, and the rotor permanent magnets consist of one group of regularly shaped rectangular permanent magnets and another group of roughly rectangular permanent magnets. By designing the groove shape of the stator, the shape of the windings and permanent magnets, and the air gap between the stator and rotor, efficient operation of the motor (including the controller) system can be achieved across the variable frequency and full speed range, and the motor permanent magnets have excellent resistance to irreversible demagnetization.

[0057] D1 is the first radial size, W1 is the first size, H1 is the second size, and D2 is the second radial size. W2 is the width of the stator tooth, θ1 is the angle between the tooth body and the winding groove of the stator tooth, and θ2 is the angle between the radial outer wall surface of the tooth shoe of the stator tooth and the tangent plane of the tooth shoe end.

[0058] A three-dimensional image of the stator structure and winding 110 is shown in Figure 3, where the winding 110 is made by winding copper wire around each stator tooth.

[0059] A three-dimensional image of the rotor is shown in Figure 4. Two groups of permanent magnets, namely the first magnet 2082 and the second magnet 2084, are mounted within the rotor core sheet 204, and the magnetization direction of the two groups of permanent magnets is indicated by the arrows in Figure 5. The rotor core sheet 204 and the two groups of permanent magnets are secured by end plates on both sides, and the end plates on both sides are secured by four rivets, as shown in Figure 6. The rivets pass through the mounting holes of the rotor core, as shown in Figure 4.

[0060] The rotor core sheet 204 is as shown in Figures 7 and 8, where the diameter of the rotor arc portion 1 is D3 = D2 - 2 × lg, the center is O1, and lg is the air gap length between the stator and rotor of the motor 200, which is specifically set according to the compressor exhaust volume and the precision of the manufacturing process. The arc radius of the outer notch of the rotor is 0.2 × D3 ≤ R1 ≤ 0.3 × D3, the center is O2, and it is not concentric with the arc of diameter D3. The width of the permanent magnet is W6 = D3 / 3, where 1.01 × D4 ≤ H4 ≤ 1.2 × D4, and 0.2 × (D3 - 2 × H4) ≤ H3 ≤ 0.25 × (D3 - 2 × H4). The width of the permanent magnet is W3 = 2 × W5, and the following conditions apply: 1.3 × W4 ≤ W3 ≤ 1.35 × W4, 0° ≤ θ3 ≤ 90°, and 0.8 × W5 ≤ H2 ≤ 0.95 × W5.

[0061] Here, D3 is the third radial size, D4 ​​is the fourth radial size, and R1 is the radius of the arc-shaped notch. H4 is the shortest distance from the first mounting groove 2062 to the axis, H3 is the radial size of the first mounting groove, W4 is the radially outer gap of the second mounting groove 2064, W5 is the radially inner gap of the second mounting groove 2064, H2 is the radial size of the outer rectangular portion in the second mounting groove, and θ3 is the angle between the legs and the bottom of the inner trapezoidal portion in the second mounting groove.

[0062] Within the rotational speed range of the full variable frequency operation, the efficiency of the motor system limited to this invention is improved by more than 1% compared to conventional solutions, as shown in Figure 9. On the other hand, in a two-phase short-circuit state, when the short-circuit current of the motor 200 becomes 20 times that of the rated state, the proportion of the region in which irreversible demagnetization occurs in the permanent magnet is kept within 4%, as shown in Figure 10.

[0063] According to the stator structure, motor, and compressor of this invention, it is possible to improve the efficiency and stability of the motor, and further improve its output performance.

[0064] In this application, terms such as “first,” “second,” and “third” are used solely for descriptive purposes and should not be interpreted as indicating or implying relative importance. Unless otherwise specified, the term “multiple” refers to two or more. The terms “attachment,” “connection,” “joining,” and “fixing” should be understood in a broad sense; for example, “connection” may be a fixed connection, a detachable connection, or an integral connection, and “joining” may be a direct connection or an indirect connection via an intermediate medium. A person skilled in the art will be able to understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0065] In the description of this application, 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 drawings and are provided for the convenience and simplification of the description of this application, and are not intended to indicate or imply that the shown devices or elements necessarily have a particular direction or are configured and operated in a particular direction. Therefore, these descriptions should not be construed as limitations on this application.

[0066] In this specification, terms such as “one embodiment,” “several embodiments,” and “specific embodiments” mean that the specific features, structures, materials, or properties described in combination with such embodiments or examples are included in at least one embodiment or example of the present application. In this specification, exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or properties described may be combined in any suitable manner in any one or more embodiments or examples.

[0067] While preferred embodiments of the present application have been described above, the present application may have various modifications and changes for those skilled in the art without limiting it. Any modifications, equivalent substitutions, or improvements within the spirit and principles of the present application should be included within the scope of protection. [Explanation of Symbols]

[0068] Here, the correspondence between the reference numerals and part names in Figures 1 to 8 is as follows: 100 Stator Structure 102 Stator core sheet 104 Stater York 106 Status Teeth 1062 Teeth main body structure 1064 Tooth Shoe Structure 108 Winding groove 110 windings 200 motor 202 Rotor Structure 204 Rotor core seat 2062 First mounting groove 2064 Second mounting groove 2082 First Magnet 2084 Second Magnet 210 mounting holes 212 End Plate 214 Shaft hole 216 Arc-shaped notch

Claims

1. It has a rotor structure, It includes multiple rotor core sheets, a first magnet, and a second magnet. The plurality of rotor core sheets are installed in a stacked manner. Each rotor core seat is provided with a shaft hole and a first mounting groove and a second mounting groove uniformly arranged around the circumference surrounding the axis of the shaft hole, wherein the shape of the first mounting groove differs from the shape of the second mounting groove, and the circumferential position of the first mounting groove differs from the circumferential position of the second mounting groove. The first magnet is provided in the first mounting groove, The second magnet is provided in the second mounting groove, A rotor structure in which the diameter of the shaft hole is a fourth radial size, the shortest distance between the first mounting groove and the axis is a fourth size, and the ratio of the fourth size to the fourth radial size is greater than 1 and less than 1.

2.

2. The rotor structure according to claim 1, wherein the ratio of the fourth size to the fourth radial size is in the range of 1.01 to 1.

2.

3. The rotor structure according to claim 1 or 2, wherein the cross-sectional shape of the second magnet is a rectangle and a trapezoid connected in the radial direction, the longer side of the rectangle is connected to the lower base of the trapezoid, and the size of the longer side of the rectangle is twice the size of the upper base of the trapezoid.

4. The rotor structure according to claim 3, wherein the angle formed by the side of the trapezoid and the top base of the trapezoid is between 0° and 90°.

5. The rotor structure according to claim 3 or 4, wherein the ratio of the size of the shorter side of the rectangle to the size of the upper base of the trapezoid is 0.8 to 0.

95.

6. The rotor structure according to any one of claims 3 to 5, wherein the ratio of the size of the longer side of the rectangle to the size of the opening at one end of the second mounting groove away from the axis is in the range of 1.3 to 1.

35.

7. Mounting holes provided in the rotor core seat, The rotor structure according to any one of claims 1 to 6, further comprising end plates provided at both axial ends of a plurality of rotor core sheets and each connected to the rotor core sheet via mounting holes.

8. A rotor structure according to any one of claims 1 to 7, A motor comprising a stator structure installed coaxially with the rotor structure.

9. The motor according to claim 8, wherein the radial size of the air gap between the rotor structure and the stator structure is a first air gap size, the diameter size of the third virtual circle corresponding to the outer edge of the rotor core seat is a third radial size, a winding groove is formed between any two adjacent stator teeth in the stator structure, one end of the winding groove away from the stator yoke forms a second virtual circle with a diameter of the second radial size, and the difference between the second radial size and the third radial size is twice the first air gap size.

10. The motor according to claim 9, further comprising an arc-shaped notch provided on the outer edge of the rotor core sheet, wherein the center of the arc-shaped notch does not coincide with the axis, and the range of the ratio of the radius of the arc-shaped notch to the third radial size is 0.15 to 0.

35.

11. The motor according to claim 9 or 10, wherein the ratio of the width of the first mounting groove to the difference between the third radial size and twice the fourth size is in the range of 0.15 to 0.

3.

12. A rotor structure according to any one of claims 1 to 7, or A compressor comprising the motor according to any one of claims 8 to 11.

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