Rotor, electric machine and electric consumer

Abstract

The utility model discloses a rotor, motor and electric equipment, rotor includes: rotor core and permanent magnet, rotor core has the accommodation groove, and rotor core outer diameter is D o , and rotor core still forms the center hole, and the center hole inner diameter is D i ; the cross section of permanent magnet is by the first part, the second part and the third part that set gradually in the direction from the radial inner side to the radial outer side and is connected gradually in proper order, and the width direction of permanent magnet is with the radial of rotor core orthogonal, and the width of first part gradually increases in the direction close to the second part and / or the width of third part gradually increases in the direction close to the second part, wherein on the cross section with the axial of rotor core orthogonal, the total area of the cross section of permanent magnet is S1, and the length of permanent magnet in the radial is h1, and satisfy: the rotor designed according to the utility model can consider the work reliability and work efficiency of motor.

Description

Technical Field

[0001] This utility model relates to the field of motors, and in particular to a rotor, a motor and an electrical device. Background Technology

[0002] In related technologies, improving the working efficiency of a motor requires increasing its magnetic load. Generally, the more permanent magnets used, the greater the corresponding air gap magnetic induction intensity. In some existing technologies, the space for setting permanent magnets on the motor rotor is limited, and this space restricts the shape of the permanent magnets, which in turn limits the amount of permanent magnets used. A small amount of permanent magnets results in low motor efficiency. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a rotor. The rotor designed according to this invention can balance the reliability and efficiency of the motor.

[0004] This utility model also proposes an electric motor having the above-mentioned rotor.

[0005] This utility model also proposes an electrical device having the above-mentioned motor.

[0006] The rotor according to this utility model includes: a rotor core, the rotor core having a receiving groove, and the outer diameter of the rotor core being D. o The rotor core also has a central hole with an inner diameter of D. i A permanent magnet is disposed within the receiving groove. In a cross-section orthogonal to the rotor core axis, the permanent magnet's cross-section is formed by a first part, a second part, and a third part sequentially connected in a radially inward to radially outward direction. The width direction of the permanent magnet is orthogonal to the radial direction of the rotor core. The width of the first part gradually increases towards the second part, and / or the width of the third part gradually increases towards the second part. In the cross-section orthogonal to the rotor core axis, the total cross-sectional area of ​​the permanent magnet is S1, and the radial length of the permanent magnet is h1, satisfying the following: .

[0007] The rotor of this utility model reduces magnetic leakage at the inner magnetic bridge by defining the relationship between the rotor core and the permanent magnet, while taking into account the structural strength of the rotor core and the amount of permanent magnet, so as to ensure that the motor equipped with the rotor can work normally and ensure that the motor has high working efficiency.

[0008] According to some embodiments of the present invention, the rotor core includes a collar portion and a sector portion. A central hole is formed in the collar portion. The sector portions are connected to the outer side of the collar portion in the radial direction and are configured as a plurality of portions spaced apart in the circumferential direction. The collar portion and two adjacent sector portions in the circumferential direction jointly define the receiving groove. The permanent magnets are configured as a plurality of p corresponding one-to-one with the plurality of receiving grooves. The area of ​​a single permanent magnet on a cross-section orthogonal to the axial direction of the rotor core is S, satisfying: .

[0009] According to some embodiments of the present invention, the fan-shaped portion has a first end and a second end at its two ends in the radial direction. The first end is located on the inner side in the radial direction and is connected to the collar portion. The second end is located on the outer side in the radial direction and extends in a direction away from the collar portion. The width direction of the fan-shaped portion is orthogonal to the radial direction of the rotor core, and the width of the fan-shaped portion gradually increases from the first end to the second end.

[0010] According to some embodiments of the present invention, the minimum width of the first end is W1, which satisfies: 0.5mm≤W1≤1mm.

[0011] According to some embodiments of the present invention, the second end has a limiting protrusion formed on at least one side in the circumferential direction, the limiting protrusion extending in the circumferential direction and the inner surface of the limiting protrusion in the radial direction being adapted to abut against the outer surface of the permanent magnet in the radial direction.

[0012] According to some embodiments of the present invention, the fan-shaped portion is provided with at least one through hole in the axial direction, and the through hole is suitable for the filler to pass through during the injection molding of the rotor core.

[0013] According to some embodiments of the present invention, the surface of the receiving groove defined by the collar portion is formed with a stop protrusion, the stop protrusion extending radially away from the collar portion and adapted to stop against the inner side of the permanent magnet in the radial direction.

[0014] According to some embodiments of this utility model, the cross-section of the receiving groove is adapted to the cross-section of the permanent magnet. The cross-sectional shape of the permanent magnet is polygonal, and the polygon is axially symmetric about the radial direction of the rotor core. The line segment located on the radial inner side of the first part is the first line segment, and the line segment located on the radial outer side of the third part is the second line segment. The second line segment is parallel to the first line segment and orthogonal to the axis of symmetry of the polygon. The width of the first line segment is W2, the maximum width of the second part is W3, and the width of the second line segment is W4, satisfying: W2≤W4<W3, or W2<W4≤W3.

[0015] According to some embodiments of this utility model, the following condition is satisfied: 1.2≤ ≤1.4.

[0016] According to some embodiments of this utility model, the following condition is satisfied: 1.05 ≤ ≤1.1.

[0017] According to some embodiments of the present invention, the number of line segments constituting the polygonal cross-section of the permanent magnet is Q, which satisfies: Q∈{x|x is an even number and x≥6}.

[0018] According to some embodiments of this utility model, each side of the polygon is either arc-shaped or straight-shaped.

[0019] The motor according to a second aspect embodiment of the present invention is briefly described below.

[0020] The motor according to this utility model includes the rotor described in any of the above embodiments. Since the motor according to this utility model is equipped with the rotor of the above embodiments, the motor has higher working efficiency and more reliable structure.

[0021] The following is a brief description of the electrical equipment according to a third aspect embodiment of the present invention.

[0022] The electrical equipment according to this utility model includes the motor described in the above embodiments. Since the electrical equipment according to this utility model is equipped with the motor described in the above embodiments, the user experience of the electrical equipment is better.

[0023] In summary, the rotor of this utility model, by limiting the relationship between the rotor core and the permanent magnet, can reduce magnetic leakage at the inner magnetic bridge, while taking into account the structural strength of the rotor core and the amount of permanent magnet, so as to ensure that the motor equipped with this rotor can work normally and ensure that the motor has high working efficiency.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a cross-sectional view of the rotor according to an embodiment of the present utility model.

[0026] Figure 2 yes Figure 1 Cross-sectional view of the rotor core.

[0027] Figure 3 yes Figure 1 Cross-sectional view of the permanent magnet.

[0028] Figure 4 According to the embodiments of this utility model The relationship between the range of values ​​and the motor's working efficiency is shown in the graph.

[0029] Figure label: 1. Rotor; 10. Rotor core; 10a. Receiving groove; 10b. Center hole; 11. Shaft collar; 111. Stop protrusion; 12. Sector-shaped part; 121. First end; 122. Second end; 1221. Limiting protrusion; 12a. Through hole; 20. Permanent magnet; 21. First part; 211. First line segment; 22. Second part; 23. Third part; 231. Second line segment. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In related technologies, improving the working efficiency of a motor requires increasing its magnetic load. Generally, the more permanent magnets used, the greater the corresponding air gap magnetic induction intensity. In some existing technologies, the space for setting permanent magnets on the motor rotor is limited, and this space restricts the shape of the permanent magnets, which in turn limits the amount of permanent magnets used. A small amount of permanent magnets results in low motor efficiency.

[0036] The following is for reference. Figures 1-4 The rotor 1 according to an embodiment of the present invention is described.

[0037] like Figures 1-3 As shown, the rotor 1 according to this utility model includes: a rotor core 10 and a permanent magnet 20. The rotor core 10 has a receiving groove 10a, and the outer diameter of the rotor core 10 is D. o The rotor core 10 also has a central hole 10b, the inner diameter of which is D. iThe permanent magnet 20 is disposed within the receiving groove 10a. In a cross-section orthogonal to the axial direction of the rotor core 10, the cross-section of the permanent magnet 20 is formed by sequentially connecting a first part 21, a second part 22, and a third part 23 arranged in a radially inward direction to a radially outward direction. The width direction of the permanent magnet 20 is orthogonal to the radial direction of the rotor core 10. The width of the first part 21 gradually increases towards the second part 22, and / or the width of the third part 23 gradually increases towards the second part 22. In the cross-section orthogonal to the axial direction of the rotor core 10, the total cross-sectional area of ​​the permanent magnet 20 is S1, and the radial length of the permanent magnet 20 is h1, satisfying the following: .

[0038] Here, the rotor core 10 has a receiving groove 10a, and the outer diameter of the rotor core 10 is D. o The rotor core 10 also has a central hole 10b, the inner diameter of which is D. i The permanent magnet 20 is disposed in the receiving groove 10a. On the cross section orthogonal to the axial direction of the rotor core 10, the cross section of the permanent magnet 20 is formed by the sequential connection of a first part 21, a second part 22 and a third part 23 arranged in a radially inner to radially outer direction. The width direction of the permanent magnet 20 is orthogonal to the radial direction of the rotor core 10. The width of the first part 21 gradually increases in the direction close to the second part 22 and / or the width of the third part 23 gradually increases in the direction close to the second part 22.

[0039] You can refer to this. Figure 1 The inner magnetic bridge is located on the radially inner side of the rotor core 10. The first part 21 of the permanent magnet 20 is located on the radially inner side of the rotor core 10 and is adjacent to the inner magnetic bridge. By designing the width of the first part 21 to gradually increase towards the second part 22, the width of the inner magnetic bridge can be reduced. Here, since magnetic leakage is prone to occur at the inner magnetic bridge, reducing the width of the inner magnetic bridge can reduce magnetic leakage at this location. Furthermore, the width of the second part 22 of the permanent magnet 20 is larger than that of the first part 21 and / or the third part 23, allowing for a larger quantity of permanent magnets 20 and improving the operating efficiency of the motor equipped with the permanent magnets 20.

[0040] Furthermore, Figure 1 The viewpoint is a section orthogonal to the axial direction of the rotor core 10. From this viewpoint, the total cross-sectional area of ​​the permanent magnet 20 is S1, and the radial length of the permanent magnet 20 is h1, satisfying the following: .

[0041] Specifically, In order to be in Figure 1From the perspective of improving motor efficiency, the larger the proportion of the cross-sectional area of ​​the permanent magnet 20 to the cross-sectional area of ​​the rotor core 10, the better. The more permanent magnets 20 are used, the higher the motor energy efficiency. From the perspective of improving motor structural stability, the smaller the proportion of the cross-sectional area of ​​the permanent magnet 20, the more material is used in the rotor core 10, and the better the structural strength and structural stability of the rotor core 10. In order to be in Figure 1 The ratio of the radial length of the permanent magnet 20 to the radial length of the rotor core 10 from a certain perspective means that by increasing the radial length of the permanent magnet 20, the amount of permanent magnet 20 can also be increased, thereby improving the energy efficiency of the motor.

[0042] To balance the structural strength of the rotor core 10 and the amount of permanent magnets 20 used, the permanent magnets 20 can be designed such that their total cross-sectional area S1 and radial length h1 satisfy the formula: ,when When the value is too small, the amount of permanent magnet 20 used is small, resulting in lower motor efficiency; when... When the value of is too large, the structural strength and reliability of rotor 1 are poor, and the motor is prone to failure. Therefore, it is advisable to refer to... Figure 4 , Figure 4 for The relationship between the range of values ​​and the motor efficiency is shown in the graph. When the following conditions are met: At this time, the motor has high working efficiency and good structural strength.

[0043] According to this utility model, the rotor 1 limits the relationship between the rotor core 10 and the permanent magnet 20, which can reduce magnetic leakage at the inner magnetic bridge, and take into account the structural strength of the rotor core 10 and the amount of permanent magnet 20, so as to ensure that the motor equipped with the rotor 1 can work normally while ensuring that the motor has high working efficiency.

[0044] According to some embodiments of this utility model, such as Figure 1 , Figure 2 As shown, the rotor core 10 includes a collar portion 11 and sector portions 12. A central hole 10b is formed in the collar portion 11. The sector portions 12 are connected to the outer side of the collar portion 11 in the radial direction and are configured to be multiple and spaced apart in the circumferential direction. The collar portion 11 and two adjacent sector portions 12 in the circumferential direction jointly define a receiving groove 10a. The permanent magnets 20 are configured to be multiple and p in number, corresponding one-to-one with the multiple receiving grooves 10a. The area of ​​a single permanent magnet 20 on a cross section orthogonal to the axial direction of the rotor core 10 is S, satisfying: .

[0045] Here you can refer to Figure 1The rotor core 10 includes a collar portion 11 and sector portions 12. A central hole 10b is formed in the collar portion 11. The sector portions 12 are connected to the outer side of the collar portion 11 in the radial direction and are configured to be arranged in multiple circumferentially spaced apart. The collar portion 11 and two adjacent sector portions 12 in the circumferential direction jointly define a receiving groove 10a. Since the sector portions 12 are configured to be arranged in multiple circumferentially spaced apart, there are also multiple receiving grooves 10a. Permanent magnets 20 are disposed in the receiving grooves 10a and are configured to correspond one-to-one with the multiple receiving grooves 10a. Furthermore, the number of permanent magnets 20 is p, and the area of ​​a single permanent magnet 20 on a cross section orthogonal to the axial direction of the rotor core 10 is S. As mentioned above, the total cross-sectional area S1 of the permanent magnets 20 is S1 = p × S. That is to say, the aforementioned formula... It can be replaced with ,satisfy In order to balance the structural strength of the rotor core 10 and the amount of permanent magnets 20, the motor equipped with the rotor 1 can work normally while ensuring that the motor has high working efficiency.

[0046] According to some embodiments of this utility model, such as Figure 2 As shown, the two ends of the sector 12 in the radial direction are a first end 121 and a second end 122, respectively. The first end 121 is located on the inner side in the radial direction and is connected to the collar 11, while the second end 122 is located on the outer side in the radial direction and extends away from the collar 11. The width direction of the sector 12 is orthogonal to the radial direction of the rotor core 10, and the width of the sector 12 gradually increases from the first end 121 to the second end 122.

[0047] Specifically, the sector 12 has a first end 121 on its inner radial side and a second end 122 on its outer radial side. The width of the sector 12 gradually increases in the direction from the first end 121 to the second end 122. Here, the first end 121 of the sector 12 is the inner magnetic bridge, where magnetic leakage may occur. The smaller the width of the first end 121, the smaller the magnetic leakage. The second end 122 may also leak magnetic flux, and the larger the width of the second end 122, the smaller the magnetic leakage. Therefore, the sector 12 is designed such that its width gradually increases in the direction from the first end 121 to the second end 122 to reduce the magnetic leakage of the sector 12.

[0048] According to some embodiments of this utility model, such as Figure 1 , Figure 2As shown, the minimum width of the first end 121 is W1, satisfying: 0.5mm ≤ W1 ≤ 1mm. Here, the first end 121 of the sector 12 is the inner magnetic bridge. The smaller the width of the first end 121, the smaller the magnetic leakage, but the structural strength is poor. Conversely, the larger the width of the first end 121, the better the structural strength, but the magnetic leakage increases. Therefore, the minimum width W1 of the first end 121 satisfies: 0.5mm ≤ W1 ≤ 1mm, so that the sector 12 has good structural strength and reduces magnetic leakage, enabling the motor equipped with the rotor 1 to work normally and ensuring high motor efficiency. For example, W1 can be 0.5mm, 0.6mm, 0.75mm, 1mm, etc.

[0049] According to some embodiments of this utility model, such as Figure 2 As shown, the second end 122 has a limiting protrusion 1221 formed on at least one side in the circumferential direction. The limiting protrusion 1221 extends in the circumferential direction and the inner surface of the limiting protrusion 1221 in the radial direction is adapted to abut against the outer surface of the permanent magnet 20 in the radial direction. Here, the limiting protrusion 1221 can limit the permanent magnet 20 in the radial direction to prevent the permanent magnet 20 from falling out of the receiving groove 10a.

[0050] exist Figure 2 In the specific embodiment shown, the second end 122 has limiting protrusions 1221 on both sides in the circumferential direction. These two limiting protrusions 1221 extend in opposite directions in the circumferential direction. The two limiting protrusions 1221 facing each other in the circumferential direction on the second ends 122 of two adjacent sector portions 12 together define the opening portion of the same receiving groove 10a. The two limiting protrusions 1221 belonging to different sector portions 12 abut against the outer surface of the same permanent magnet 20 in the radial direction within the same receiving groove 10a, thereby limiting the permanent magnet 20 in the radial direction and preventing the permanent magnet 20 from falling out of the receiving groove 10a.

[0051] exist Figure 2 In the specific embodiment shown, the width of the sector 12 gradually changes, and the width of the sector 12 gradually increases in the direction from the first end 121 to the second end 122. The portion of the sector 12 that contacts the first part 21 of the permanent magnet 20 is narrower, and the increase in width is relatively slow. The portion of the sector 12 that contacts the second part 22 of the permanent magnet 20 is wider than the portion of the sector 12 that contacts the first part 21 of the permanent magnet 20, and the increase in width is faster. The portion of the sector 12 that contacts the third part 23 of the permanent magnet 20 is wider than the portion of the sector 12 that contacts the second part 22 of the permanent magnet 20, and the increase in width is faster.

[0052] The width of the sector 12 is designed as described above, so that the width of the receiving groove 10a between two adjacent sector 12 gradually increases at the location where the first part 21 of the permanent magnet 20 is provided, so that the receiving groove 10a expands outward at the location where the first part 21 of the permanent magnet 20 is provided, allowing for a larger quantity of permanent magnet 20. Furthermore, the width of the receiving groove 10a between two adjacent sector 12 is larger at the location where the second part 22 of the permanent magnet 20 is provided, in order to accommodate a larger volume of permanent magnet 20. The width of the receiving groove 10a between two adjacent sector 12 gradually decreases at the location where the third part 23 of the permanent magnet 20 is provided, so that the receiving groove 10a narrows at the location where the third part 23 of the permanent magnet 20 is provided, in order to clamp the third part 23 of the permanent magnet 20 and limit the permanent magnet 20 in the radial direction, preventing the permanent magnet 20 from falling out of the receiving groove 10a.

[0053] According to some embodiments of this utility model, such as Figure 1 , Figure 2 As shown, the sector 12 has at least one through hole 12a extending through it in the axial direction. The through hole 12a is suitable for the filler to pass through during the injection molding of the rotor core 10. Here, the filler is generally a non-magnetic material to avoid generating additional eddy current losses. Liquid epoxy resin or other filler materials can be injected into the rotor core 10 through the through hole 12a on the sector 12. After the filler cures, it forms an integral fixed structure to firmly constrain the permanent magnet 20 to the rotor core 10, reducing the probability of the rotor core 10 shifting or falling off under harsh conditions such as high speed, high temperature, and vibration, and ensuring reliable operation of the motor.

[0054] According to some embodiments of this utility model, such as Figure 2 As shown, the surface of the collar portion 11 defining the receiving groove 10a is formed with a stop protrusion 111. The stop protrusion 111 extends radially away from the collar portion 11 and is adapted to stop the permanent magnet 20 radially inside, so as to restrict the movement of the permanent magnet 20 in the receiving groove 10a, improve the assembly reliability of the rotor 1, prevent the permanent magnet 20 from shifting when the motor is working, and improve the working reliability of the motor.

[0055] According to some embodiments of this utility model, such as Figure 1 , Figure 3 As shown, the cross-section of the receiving groove 10a is adapted to the cross-section of the permanent magnet 20. The cross-sectional shape of the permanent magnet 20 is polygonal and the polygon is axially symmetric about the radial direction of the rotor core 10. The line segment of the first part 21 located on the radial inner side is the first line segment 211, and the line segment of the third part 23 located on the radial outer side is the second line segment 231. The second line segment 231 is parallel to the first line segment 211 and orthogonal to the axis of symmetry of the polygon. The width of the first line segment 211 is W2, the maximum width of the second part 22 is W3, and the width of the second line segment 231 is W4, satisfying: W2≤W4<W3, or W2<W4≤W3.

[0056] Here, the permanent magnet 20 has a polygonal cross-sectional shape, and the polygon is axially symmetric about the radial direction of the rotor core 10. The line segment of the first part 21 located radially inside is called the first line segment 211, and the line segment of the third part 23 located radially outside is called the second line segment 231. The second line segment 231 is parallel to the first line segment 211 and orthogonal to the axis of symmetry of the polygon. The permanent magnet 20 has an axially symmetric structure on a cross-section orthogonal to the axial direction of the rotor core 10, which can achieve periodicity and maintain magnetic circuit consistency.

[0057] Furthermore, the width W2 of the first segment 211 is the minimum width of the first part 21, and the width W4 of the second segment 231 is the minimum width of the third part 23. The first part 21 and / or the third part 23 are designed such that their widths gradually increase towards the second part 22. The maximum width of the second part 22 is W3, satisfying: W2 ≤ W4 < W3, or W2 < W4 ≤ W3. That is, W2, W3, and W4 are not simultaneously equal, and the maximum width W3 of the second part 22 is maximized to increase the amount of permanent magnet 20 used. W4 can also be larger than W2. The larger the width W4 of the second segment 231, the smaller the magnetic leakage. The structure of the permanent magnet 20 is designed as described above, allowing for a larger amount of permanent magnet 20 used, which can improve the working efficiency of the motor equipped with the permanent magnet 20 while ensuring the normal operation of the rotor 1.

[0058] According to some embodiments of this utility model, the following condition is satisfied: 1.2≤ ≤1.4. That is, W2 < W3, and if W2 is too small or W3 is too large, it will result in poor structural strength of the rotor core 10 and poor reliability of the rotor 1. Furthermore, an excessively large W3 will cause magnetic saturation. Conversely, an excessively large W2 or an excessively small W3 will result in insufficient permanent magnets 20, leading to low efficiency in the motor equipped with this rotor 1. Therefore, the following condition must be met: 1.2 ≤ The value is ≤1.4, so as to balance the structural strength of the rotor core 10 and the amount of permanent magnet 20, thereby balancing the reliability and efficiency of the motor.

[0059] According to some embodiments of this utility model, the following condition is satisfied: 1.05 ≤ ≤1.1. That is to say, if the permanent magnet 20 is a non-rectangular structure, and W3×h1 is too small or S is too large, the amount of permanent magnet 20 used will be insufficient, resulting in low efficiency of the motor equipped with this rotor 1. Conversely, if W3×h1 is too large or S is too small, the structural strength of the rotor core 10 will be poor, leading to poor reliability of the rotor 1. Therefore, the following condition must be met: 1.05≤ The value is ≤1.1, so as to balance the structural strength of the rotor core 10 and the amount of permanent magnet 20, thereby balancing the reliability and efficiency of the motor.

[0060] According to some embodiments of this utility model, such as Figure 3 As shown, the number of line segments constituting the polygonal cross-section of the permanent magnet 20 is Q, satisfying: Q∈{x|x is an even number and x≥6}. At this time, the permanent magnet 20 has an axisymmetric structure on the cross-section orthogonal to the rotor core 10, which can achieve periodicity and maintain the consistency of the magnetic circuit.

[0061] Furthermore, each side of the polygon can be either curved or straight, and the shape of the permanent magnet 20 is not limited. The shape of the receiving groove 10a and the shape of the permanent magnet 20 can be designed according to specific circumstances. Figure 3 In the specific embodiment shown, each side of the polygon is a straight line.

[0062] The motor according to this utility model is briefly described below.

[0063] The motor according to this utility model includes the rotor 1 described in any of the above embodiments. Since the motor according to this utility model is equipped with the rotor 1 of the above embodiments, the motor has higher working efficiency and more reliable structure.

[0064] The electrical equipment according to this utility model is briefly described below.

[0065] The electrical equipment according to this utility model includes the motor described in the above embodiments. Since the electrical equipment according to this utility model is equipped with the motor described in the above embodiments, the user experience of the electrical equipment is better.

[0066] In summary, the rotor 1 of this utility model, by defining the relationship between the rotor core 10 and the permanent magnet 20, can reduce magnetic leakage at the inner magnetic bridge, while taking into account the structural strength of the rotor core 10 and the amount of permanent magnet 20, so as to ensure that the motor equipped with the rotor 1 can work normally and ensure that the motor has high working efficiency.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above 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 one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0068] Although embodiments of the present invention have been shown and described above, variations, modifications, substitutions and alterations can be made to the above embodiments.

Claims

1. A rotor, characterized in that, include: Rotor core, the rotor core having a receiving slot, the outer diameter of the rotor core being D. o The rotor core also has a central hole with an inner diameter of D. i ; A permanent magnet is disposed in the receiving groove. On a cross-section orthogonal to the axial direction of the rotor core, the cross-section of the permanent magnet is formed by a first part, a second part, and a third part arranged sequentially in a radially inward direction to a radially outward direction. The width direction of the permanent magnet is orthogonal to the radial direction of the rotor core. The width of the first part gradually increases in the direction close to the second part and / or the width of the third part gradually increases in the direction close to the second part. in On a cross-section orthogonal to the axial direction of the rotor core, the total cross-sectional area of ​​the permanent magnet is S1, and the radial length of the permanent magnet is h1, satisfying the following: .

2. The rotor according to claim 1, characterized in that, The rotor core includes a collar portion and a sector portion. The central hole is formed in the collar portion. The sector portion is connected to the outer side of the collar portion in the radial direction and is configured as a plurality of them spaced apart in the circumferential direction. The collar portion and two adjacent sector portions in the circumferential direction together define the receiving groove. in The permanent magnet is constructed as multiple p-shaped elements corresponding one-to-one with the plurality of receiving slots, and the area of ​​a single permanent magnet on a cross-section orthogonal to the rotor core axis is S, satisfying: .

3. The rotor according to claim 2, characterized in that, The fan-shaped portion has a first end and a second end at its two ends in the radial direction. The first end is located on the inner side in the radial direction and is connected to the collar portion. The second end is located on the outer side in the radial direction and extends in a direction away from the collar portion. in The width direction of the sector is orthogonal to the radial direction of the rotor core, and the width of the sector gradually increases from the first end to the second end.

4. The rotor according to claim 3, characterized in that, The minimum width of the first end is W1, which satisfies: 0.5mm≤W1≤1mm.

5. The rotor according to claim 3, characterized in that, The second end has a limiting protrusion formed on at least one side in the circumferential direction, the limiting protrusion extending in the circumferential direction and the inner surface of the limiting protrusion in the radial direction being adapted to abut against the outer surface of the permanent magnet in the radial direction.

6. The rotor according to claim 2, characterized in that, The sector has at least one through hole extending through it in the axial direction, the through hole being suitable for the filler to pass through during the injection molding of the rotor core.

7. The rotor according to claim 2, characterized in that, The surface of the receiving groove defined by the collar portion is formed with a stop protrusion, which extends radially away from the collar portion and is adapted to stop against the inner side of the permanent magnet in the radial direction.

8. The rotor according to claim 1, characterized in that, The cross-section of the receiving groove is adapted to the cross-section of the permanent magnet. The cross-sectional shape of the permanent magnet is polygonal and the polygon is axially symmetric about the radial direction of the rotor core. The first part of the line segment located on the radial inner side is the first line segment, and the third part of the line segment located on the radial outer side is the second line segment. The second line segment is parallel to the first line segment and orthogonal to the axis of symmetry of the polygon. The width of the first line segment is W2, the maximum width of the second part is W3, and the width of the second line segment is W4, satisfying: W2≤W4<W3, or W2<W4≤W3.

9. The rotor according to claim 8, characterized in that, Satisfy: 1.2≤ ≤1.

4.

10. The rotor according to claim 8, characterized in that, Satisfy: 1.05≤ ≤1.

1.

11. The rotor according to claim 8, characterized in that, The number of line segments constituting the polygonal cross-section of the permanent magnet is Q, which satisfies: Q∈{x|x is an even number and x≥6}.

12. The rotor according to claim 8, characterized in that, Each side of the polygon is either an arc or a straight line.

13. An electric motor, characterized in that, Includes a rotor according to any one of claims 1-12.

14. An electrical appliance, characterized in that, Includes the motor according to claim 13.

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