Rotor laminations, rotor cores, motors and compressors

Abstract

The present invention provides a rotor punching, a rotor core, a motor and a compressor. The rotor punching includes a punching body, an axial hole and a plurality of mounting parts, wherein the axial hole is provided on the punching body. The plurality of mounting parts are provided on the punching body around the axial hole. Each of the plurality of mounting parts includes two magnet slots, and each of the two magnet slots includes a first slot end close to the axial hole, wherein the first slot end includes a straight slot section and an arc slot section connected to both ends of the straight slot section. By making the first slot end close to the axial hole in each magnet slot include a straight slot section and an arc slot section, the present invention can effectively improve the leakage and demagnetization of the permanent magnets located in the magnet slot, reduce the stress and deformation of the rotor punching under high speed and high torque conditions of the motor, improve the mechanical strength of the rotor punching, enhance the reliability of the motor, solve the problem that the mechanical strength of the rotor punching is difficult to meet the requirements at high speed of the motor, and realize the design of a low leakage and high strength motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motor equipment, and in particular to a rotor punching sheet, a rotor core, a motor and a compressor. Background Art

[0002] Currently, motor rotors include rotor laminations, a key component of the rotor. Their design directly determines motor performance. To improve magnet demagnetization and magnetic flux leakage in motors and increase magnet utilization, reducing the width of the rotor laminations' magnetic isolation bridges is a common approach. However, at high motor speeds, the rotor's magnetic isolation bridges are subject to significant forces, while narrower bridges are insufficient to meet the required rotor structural strength at high speeds. Therefore, improving rotor structural strength while minimizing magnetic flux leakage has become a pressing issue. 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] To this end, a first aspect of the present invention is to provide a rotor lamination.

[0005] A second aspect of the present invention is to provide a rotor core.

[0006] A third aspect of the present invention is to provide an electric motor.

[0007] A fourth aspect of the present invention is to provide a compressor.

[0008] In view of this, according to a first aspect of the present invention, a rotor punching is provided, comprising a punching body, an axial hole, and a plurality of mounting portions, wherein the axial hole is provided on the punching body. The plurality of mounting portions are arranged on the punching body around the axial hole. Each of the plurality of mounting portions includes two magnet slots, each of the two magnet slots includes a first slot end proximate to the axial hole, wherein the first slot end includes a straight slot segment and an arcuate slot segment connecting the two ends of the straight slot segment.

[0009] The rotor punching provided by the present invention comprises a punching body, an axial hole, and multiple mounting portions. The axial hole is provided in the punching body, which is made of silicon steel. Silicon steel refers to a silicon alloy steel with a silicon content of 1.0% to 4.5% and a carbon content of less than 0.08%. Silicon steel has high magnetic permeability, low coercivity, and high resistivity, resulting in low hysteresis and eddy current losses. The axial hole is used to assemble the rotor shaft. Multiple mounting portions are arranged around the axial hole on the punching body. It is worth noting that the structures of each of the multiple mounting portions can be identical or partially identical, and can be adjusted according to actual needs. Each mounting portion includes two magnet slots, each of which includes a first slot end adjacent to the axial hole. The slot wall of the first slot end includes a straight slot section and an arc slot section connecting the two ends of the straight slot section. The straight slot sections of the two first slot ends ensure that the width of the magnetic isolation bridge between the two straight slot sections is not too large, which would affect magnet demagnetization, magnetic leakage, and magnet utilization. By arranging arc slot sections at both ends of the straight slot section, the arc slot sections can structurally reinforce the position where the centrifugal force is concentrated (the force is the greatest), reduce the stress and deformation of the rotor under high speed and high torque conditions of the motor, improve the mechanical strength of the rotor, and enhance the reliability of the motor. It is worth noting that the position where the centrifugal force is concentrated on the punching sheet body refers to the punching sheet body between the arc slot sections at the two first slot ends. The present invention makes the first slot end close to the shaft hole in each magnet slot include a straight slot section and an arc slot section. On the basis of effectively improving the leakage and demagnetization of the permanent magnets located in the magnet slot, it can also reduce the stress and deformation of the rotor punching sheet under high speed and high torque conditions of the motor, improve the mechanical strength of the rotor punching sheet, enhance the reliability of the motor, solve the problem that the mechanical strength of the rotor punching sheet of the motor is difficult to meet the requirements under high speed, and realize the design of a low leakage and high strength motor.

[0010] In a possible design, further, the portion of the punching sheet body located between the two straight slot segments constitutes a first magnetic isolation bridge, and the ratio of the width w of the first magnetic isolation bridge to the radius R of the punching sheet body is greater than 0.012 and less than 0.02.

[0011] In this design, both magnet slots have a first slot end close to the shaft hole, and the two first slot ends respectively have a straight slot section. Part of the punching body between the two straight slot sections constitutes a first magnetic isolation bridge, and the ratio (w / R) between the width w of the first magnetic isolation bridge and the radius R of the punching body satisfies the above relationship, thereby optimizing the rotor magnetic field distribution, significantly improving the electromagnetic torque of the motor with the rotor punching, effectively improving the leakage and demagnetization of the permanent magnets located in the magnet slots, and dispersing the centrifugal stress around the magnet slots of the rotor punchings when operating at high speeds, thereby solving the problem that the mechanical strength of the rotor punchings of the motor is difficult to meet the requirements at high speeds, and realizing the design of a low leakage and high-strength motor. In addition, it can also significantly improve the utilization rate of the permanent magnets and the power density of the motor, further improve the working performance of the motor, and improve the user's comfort.

[0012] In a possible design, further, the ratio of the width w of the first magnetic isolation bridge to the number of pole pairs p of the rotor punching is greater than 0.2 and less than 0.5.

[0013] In this design, the ratio (w / p) between the width w of the first magnetic isolation bridge and the pole pair number p of the rotor punching satisfies the above relationship, thereby optimizing the rotor magnetic field distribution, significantly improving the electromagnetic torque of the motor with the rotor punching, effectively improving the leakage and demagnetization of the permanent magnets located in the magnet slots, and dispersing the centrifugal stress around the magnet slots of the rotor punchings when operating at high speeds, thereby solving the problem that the mechanical strength of the rotor punchings of the motor is difficult to meet the requirements at high speeds, and realizing the design of a low leakage and high-strength motor. In addition, it can also significantly improve the utilization rate of the permanent magnets and the power density of the motor, further improving the working performance of the motor and improving the user's comfort.

[0014] In a possible design, further, the width of the first magnetic isolation bridge is greater than 0.6 mm.

[0015] In this design, by setting the width of the first magnetic isolation bridge to be greater than 0.6mm, it is ensured that the first magnetic isolation bridge can provide a certain structural reinforcement effect for the punching body. When the width of the first magnetic isolation bridge is less than 0.7mm, on the one hand, the smaller width will increase the processing difficulty. On the other hand, on the basis of meeting the magnetic isolation requirements, it can also reduce the stress deformation of the rotor punching of the compressor motor, enhance the mechanical strength of the rotor punching, and improve the reliability of the motor.

[0016] In a possible design, further, at least one of the two arc slot segments is a circular arc segment, and the circular arc segment includes an arc line located on the axial end face of the punch body, and the ratio of the curvature radius r of the arc line to the radius R of the punch body is greater than or equal to 0.015 and less than or equal to 0.02.

[0017] In this design, each first slot end has a straight slot section and an arc slot section connected to both ends of the straight slot section, that is, the number of arc slot sections is two. It is worth noting that the curvature of the two arc slot sections can be the same or different. At least one of the two arc slot sections is a circular arc section, that is, the two arc slot sections include a circular arc section and a non-circular arc section, or the two arc slot sections include two circular arc sections. Furthermore, the circular arc section includes an arc line located on the axial end face of the punch body, so that the curvature radius r of the arc line and the radius R of the punch body satisfy the above relationship, thereby effectively improving the deformation problem at the position where the centrifugal force is more concentrated on the punch body, improving the mechanical strength of the rotor punching, enhancing the reliability of the motor, solving the problem that the mechanical strength of the rotor punching is difficult to meet the requirements at high speeds, and realizing the design of a low leakage magnetic and high strength motor.

[0018] In a possible design, further, the radius of curvature of the arc line is greater than or equal to 0.8 mm.

[0019] In this design, the curvature radius of the arc line meets the above-mentioned value, so that the curvature of the slot wall at the first slot end can meet the structural design requirements, thereby effectively improving the deformation problem at the position where the centrifugal force is more concentrated on the punching body, improving the mechanical strength of the rotor punching, enhancing the reliability of the motor, and solving the problem that the mechanical strength of the rotor punching is difficult to meet the requirements at high speeds, thereby realizing the design of a low leakage magnetic and high-strength motor.

[0020] In a possible design, further, the portion of the punching sheet body located between the two magnet slots constitutes an installation area, and the magnet slot includes a first straight slot wall near the center of the installation area, and the angle θ formed by the two first straight slot walls is greater than or equal to 115° and less than or equal to 125°.

[0021] In this design, part of the sheet body is located between the two magnet slots, and this part of the sheet body is called the installation area. The magnet slot includes a first straight slot wall close to the center of the installation area, and the two magnet slots have two first straight slot walls. It is worth noting that when the cross-section of the installation area is a geometric figure, the center of the installation area is the center of the geometric figure. When the cross-section of the installation area is a non-geometric figure, the center of the installation area is the intersection of the line connecting the two points farthest apart in the circumferential direction and the line connecting the two points farthest apart in the radial direction. The angle θ formed by the two first straight slot walls satisfies the above relationship, thereby being able to affect the direct-axis magnetic circuit and the cross-axis magnetic circuit of the motor, thereby indirectly affecting the various performances of the motor. With respect to the output torque of the motor, when θ satisfies the above relationship, the magnetic resistance torque component and the permanent magnet torque component of the motor can be reasonably distributed, thereby improving the output torque of the motor without increasing the cost of the electromagnetic components. Specifically, the motor's output torque consists of a reluctance torque component and a permanent magnet torque component. The motor's permanent magnet torque is proportional to the amount of permanent magnets used, while the reluctance torque is proportional to the ratio of the quadrature-axis inductance to the direct-axis inductance. This ratio, in turn, is directly related to the value of θ. Without increasing the amount of permanent magnets used, properly setting the value of θ can increase the ratio of the motor's quadrature-axis inductance to the direct-axis inductance, thereby increasing the reluctance torque component. For the same motor torque output, the permanent magnet torque can be smaller, thereby reducing the amount of permanent magnets used and thus reducing costs.

[0022] In one possible design, further, the magnet slot includes a second slot end away from the axial hole, the distance between the two first slot ends is smaller than the distance between the two second slot ends, the second slot end extends toward the interior of the installation area, and the portion of the punching body located between the second slot end and the outer peripheral edge of the punching body constitutes a second magnetic isolation bridge.

[0023] In this design, the magnet slot also includes a second slot end away from the shaft hole, and the second slot end and the first slot end are two opposite ends of the magnet slot. Since there are two magnet slots, the number of second slot ends is also two. The distance between the two first slot ends is smaller than the distance between the two second slot ends, and the two magnet slots are arranged in a V-shape on the punching sheet body. Furthermore, the second slot end extends toward the inside of the installation area, and the portion of the punching sheet body located between the second slot end and the outer peripheral edge of the punching sheet body forms a second magnetic isolation bridge. Since there are two second slot ends, there are two second magnetic isolation bridges and one first magnetic isolation bridge in one installation portion. The double magnetic bridge structure can improve the mechanical strength of the rotor punchings, optimize the rotor magnetic field distribution, significantly improve the electromagnetic torque of the motor with the rotor punchings, effectively improve the leakage and demagnetization of the permanent magnets located in the magnet slots, and disperse the centrifugal stress around the magnet slots of the rotor punchings when the rotor punchings are working at high speeds, thereby solving the problem that the mechanical strength of the rotor punchings of the motor cannot meet the requirements at high speeds, and realizing the design of low leakage and high-strength motors. In addition, the utilization rate of the permanent magnets and the power density of the motor can be significantly improved, further improving the working performance of the motor. At the same time, it can also weaken the motor torque pulsation to a certain extent, reduce the operating noise of the motor, and improve user comfort; on the other hand, the air gap groove is located on the side of the first end face away from the shaft hole, so that the air gap groove can effectively improve the leakage of the punching body while not affecting the d-axis and q-axis magnetic circuits of the motor, thereby ensuring sufficient permanent magnet torque of the motor.

[0024] In a possible design, the rotor punching further includes an assembly port, which is provided on the punching body and located between two adjacent mounting portions among the plurality of mounting portions, and is used to install the connector.

[0025] In this design, the rotor sheets also include assembly openings, located between two adjacent mounting portions. When multiple rotor sheets are stacked to form the rotor core, the multiple assembly openings extend axially through the assembly slots to form assembly slots. Connectors are inserted through the assembly slots to securely connect the multiple rotor sheets. Specifically, the connectors are rivets.

[0026] According to a second aspect of the present invention, a rotor core is provided, comprising rotor punchings provided by any of the above designs.

[0027] The rotor core provided by the present invention includes the rotor punchings provided by any of the above designs, and therefore has all the beneficial effects of the rotor punchings, which will not be described in detail here.

[0028] According to a third aspect of the present invention, a motor is provided, comprising a rotor core provided by any one of the above designs.

[0029] The motor provided by the present invention includes the rotor core provided by any of the above designs, and therefore has all the beneficial effects of the rotor core, which will not be described in detail here.

[0030] In a possible design, further, the two magnet slots of the plurality of rotor punchings of the rotor core are respectively formed into slots along the axial direction of the rotor core. The motor further includes two permanent magnets, which are disposed in the two slots in a one-to-one correspondence.

[0031] In a possible design, further, there is a gap between each of the two permanent magnets and the first slot end and / or the second slot end of the rotor sheet.

[0032] In this design, there is a gap between each permanent magnet and at least one of the two ends of the slot. The gap can play a magnetic isolation effect, which can further improve the magnetic leakage and demagnetization of the permanent magnet located in the magnet slot.

[0033] According to a fourth aspect of the present invention, a compressor is provided, comprising a motor provided by any of the above designs.

[0034] The compressor provided by the present invention includes the motor provided by any of the above designs, and therefore has all the beneficial effects of the motor, which will not be described in detail here.

[0035] 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

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0037] Figure 1 A schematic structural diagram of a rotor punching according to an embodiment of the present invention is shown;

[0038] Figure 2 A partial schematic diagram of a rotor punching according to one embodiment of the present invention is shown;

[0039] Figure 3 A diagram comparing radial deformation of a rotor punching according to an embodiment of the present invention and a rotor punching in the related art is shown;

[0040] Figure 4 A diagram comparing the overall deformation of a rotor punching according to an embodiment of the present invention and a rotor punching in the related art is shown;

[0041] Figure 5 A diagram showing a comparison of equivalent stresses between a rotor punching according to an embodiment of the present invention and a rotor punching in the related art is shown;

[0042] Figure 6 A schematic structural diagram of a motor according to an embodiment of the present invention is shown;

[0043] Figure 7 A trend diagram showing the ratio of the width of the first magnetic isolation bridge of a rotor punching to the radius of the punching body and the stress on the rotor according to one embodiment of the present invention is shown;

[0044] Figure 8 A schematic structural diagram of a compressor according to an embodiment of the present invention is shown.

[0045] in, Figures 1 to 8 The corresponding relationship between the reference numerals and component names is as follows:

[0046] 100 rotor punchings,

[0047] 110 punch body,

[0048] 120 shaft hole,

[0049] 130 mounting portion, 130a magnet slot,

[0050] 131 first slot end, 131a straight slot section, 131b arc slot section,

[0051] 132 second slot end,

[0052] 140 The first magnetic isolation bridge,

[0053] 150 installation area,

[0054] 160 Second magnetic isolation bridge,

[0055] 170 first straight groove wall,

[0056] 180 assembly port,

[0057] 200 motors,

[0058] 210 permanent magnet,

[0059] 220 stator,

[0060] 300 compressor,

[0061] 310 shell. DETAILED DESCRIPTION

[0062] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0063] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0064] Refer to the following Figures 1 to 8 The rotor sheet 100 , the rotor core, the motor 200 and the compressor 300 provided according to some embodiments of the present invention are described.

[0065] Example 1

[0066] According to the first aspect of the present invention, Figure 1 and Figure 2 As shown, a rotor punching 100 is provided, which includes a punching body 110, an axial hole 120, and a plurality of mounting portions 130, wherein the axial hole 120 is provided on the punching body 110. The plurality of mounting portions 130 are provided on the punching body 110 around the axial hole 120. Each of the plurality of mounting portions 130 includes two magnet slots 130a, and each of the two magnet slots 130a includes a first slot end 131 adjacent to the axial hole 120, wherein the first slot end 131 includes a straight slot segment 131a and an arcuate slot segment 131b connected to both ends of the straight slot segment 131a.

[0067] The rotor punching 100 provided by the present invention includes a punching body 110, an axial hole 120 and a plurality of mounting parts 130. The axial hole 120 is provided on the punching body 110, and the punching body 110 is made of silicon steel material. Silicon steel refers to silicon alloy steel with a silicon content of 1.0% to 4.5% and a carbon content of less than 0.08%. Silicon steel has the characteristics of high magnetic permeability, low coercive force, and large resistivity, so the hysteresis loss and eddy current loss are relatively small. The axial hole 120 is used to assemble the rotating shaft of the rotor. A plurality of mounting parts 130 are arranged on the punching body 110 around the axial hole 120. It is worth noting that the structure of each of the plurality of mounting parts 130 can be the same or partially the same, and can be adjusted according to actual needs. Each mounting portion 130 includes two magnet slots 130a. Each magnet slot 130a includes a first slot end 131 proximate the shaft hole 120. The slot wall of the first slot end 131 includes a straight slot section 131a and an arcuate slot section 131b connecting the two ends of the straight slot section 131a. The straight slot sections 131a of the two first slot ends 131 ensure that the width of the magnetic isolation bridge between the two straight slot sections 131a is not excessive, thereby affecting magnet demagnetization, magnetic leakage, and magnet utilization. By providing the arcuate slot sections 131b at both ends of the straight slot sections 131a, the arcuate slot sections 131b can provide structural reinforcement at the location where centrifugal force is concentrated (maximum force), reducing rotor stress and deformation under high speed and high torque conditions of the motor 200, improving the mechanical strength of the rotor, and enhancing the reliability of the motor 200. It is worth noting that the location on the punch body 110 where centrifugal force is concentrated refers to the location on the punch body 110 between the two arcuate slot sections 131b of the first slot ends 131. The present invention makes the first slot end 131 near the shaft hole 120 in each magnet slot 130a include a straight slot section 131a and an arc slot section 131b. On the basis of effectively improving the leakage magnetic field and demagnetization phenomenon of the permanent magnet 210 located in the magnet slot 130a, it can also reduce the stress and deformation of the rotor punching 100 under high speed and high torque of the motor 200, improve the mechanical strength of the rotor punching 100, enhance the reliability of the motor 200, solve the problem that the mechanical strength of the rotor punching 100 of the motor 200 is difficult to meet the requirements at high speed, and realize the design of the low leakage magnetic field and high strength motor 200.

[0068] Further, if Figure 1 、 Figure 2 and Figure 7 As shown, the portion of the punch body 110 located between the two straight slot sections 131 a constitutes a first magnetic isolation bridge 140 . The ratio of the width w of the first magnetic isolation bridge 140 to the radius R of the punch body 110 is greater than 0.012 and less than 0.02.

[0069] In this embodiment, the two magnet slots 130a each have a first slot end 131 close to the shaft hole 120, and the two first slot ends 131 each have a straight slot section 131a. The portion of the sheet body 110 between the two straight slot sections 131a constitutes a first magnetic isolation bridge 140. The ratio (w / R) between the width w of the first magnetic isolation bridge 140 and the radius R of the sheet body 110 satisfies the above relationship, as shown in FIG. Figure 3 and Figure 4 As shown, the rotor magnetic field distribution can be optimized, the electromagnetic torque of the motor 200 with the rotor punching 100 can be significantly improved, the magnetic leakage and demagnetization of the permanent magnet 210 located in the magnet slot 130a can be effectively improved, and the centrifugal stress around the magnet slot 130a of the rotor punching 100 can be dispersed when the rotor punching 100 is working at high speed. This solves the problem that the mechanical strength of the rotor punching 100 of the motor 200 is difficult to meet the requirements at high speed, and realizes the design of the motor 200 with low magnetic leakage and high strength. In addition, it can also significantly improve the utilization rate of the permanent magnet 210 and the power density of the motor 200, further improve the working performance of the motor 200, and improve the user's comfort. Figure 7 As shown, when the ratio of the width w of the first magnetic isolation bridge 140 to the radius R of the punch body 110 satisfies the above range, the stress on the punch body 110 is less than 230 MPa.

[0070] Further, if Figure 1 and Figure 2 As shown, the ratio of the width w of the first magnetic isolation bridge 140 to the number p of pole pairs of the rotor sheet 100 is greater than 0.2 and less than 0.5.

[0071] In this embodiment, the ratio (w / p) between the width w of the first magnetic isolation bridge 140 and the number p of pole pairs of the rotor sheet 100 satisfies the above relationship, as shown in FIG. Figure 3 and Figure 5 As shown, the rotor magnetic field distribution can be optimized, the electromagnetic torque of the motor 200 with the rotor punching 100 can be significantly improved, the leakage and demagnetization of the permanent magnet 210 located in the magnet slot 130a can be effectively improved, and the centrifugal stress around the magnet slot 130a of the rotor punching 100 when the rotor punching 100 is working at a high speed can be dispersed, thereby solving the problem that the mechanical strength of the rotor punching 100 of the motor 200 is difficult to meet the requirements at a high speed, and realizing the design of the motor 200 with low leakage and high strength. In addition, the utilization rate of the permanent magnet 210 and the power density of the motor 200 can be significantly improved, further improving the working performance of the motor 200 and improving the user's comfort.

[0072] Further, if Figure 1 and Figure 2 As shown, the width of the first magnetic isolation bridge 140 is greater than 0.6 mm.

[0073] In this embodiment, the width of the first magnetic isolation bridge 140 is set to be greater than 0.6 mm, thereby ensuring that the first magnetic isolation bridge 140 can provide a certain structural reinforcement effect for the punching body 110. When the width of the first magnetic isolation bridge 140 is less than 0.7 mm, on the one hand, the smaller width will increase the processing difficulty. On the other hand, on the basis of meeting the magnetic isolation requirements, it can also reduce the stress deformation of the rotor punching 100 of the compressor 300 motor 200, enhance the mechanical strength of the rotor punching 100, and improve the reliability of the motor 200.

[0074] Further, if Figure 1 and Figure 2 As shown, at least one of the two arc slot segments 131b is a circular arc segment, which includes an arc line located on the axial end face of the punch body 110, and the ratio of the curvature radius r of the arc line to the radius R of the punch body 110 is greater than or equal to 0.015 and less than or equal to 0.02.

[0075] In this embodiment, each first slot end 131 comprises a straight slot segment 131a and an arcuate slot segment 131b connecting the two ends of the straight slot segment 131a, i.e., there are two arcuate slot segments 131b. It is worth noting that the curvature of the two arcuate slot segments 131b can be the same or different. At least one of the two arcuate slot segments 131b is a circular arc segment, i.e., the two arcuate slot segments 131b can include one circular arc segment and one non-circular arc segment, or the two arcuate slot segments 131b can include two circular arc segments. Furthermore, the arc segment includes an arc line located on the axial end face of the punching body 110, so that the curvature radius r of the arc line and the radius R of the punching body 110 satisfy the above-mentioned relationship, thereby effectively improving the deformation problem at the position where the centrifugal force is more concentrated on the punching body 110, improving the mechanical strength of the rotor punching 100, enhancing the reliability of the motor 200, solving the problem that the mechanical strength of the rotor punching 100 is difficult to meet the requirements at high speeds of the motor 200, and realizing the design of a low leakage magnetic field and high-strength motor 200.

[0076] Furthermore, the curvature radius of the arc line is greater than or equal to 0.8 mm.

[0077] In this embodiment, the radius of curvature of the arc line satisfies the above-mentioned value, so that the curvature of the slot wall of the first slot end 131 can meet the structural design requirements, thereby effectively improving the deformation problem at the position where the centrifugal force is more concentrated on the punching body 110, improving the mechanical strength of the rotor punching 100, enhancing the reliability of the motor 200, solving the problem that the mechanical strength of the rotor punching 100 is difficult to meet the requirements at high speeds of the motor 200, and realizing the design of the low leakage magnetic field and high strength motor 200.

[0078] Further, if Figure 1 and Figure 2As shown, the portion of the punch body 110 located between the two magnet slots 130a constitutes the installation area 150, and the magnet slot 130a includes a first straight slot wall 170 close to the center of the installation area 150. The angle θ formed by the two first straight slot walls 170 is greater than or equal to 115° and less than or equal to 125°.

[0079] In this embodiment, part of the punching sheet body 110 is located between the two magnet slots 130a, and the part of the punching sheet body 110 is called the installation area 150. The magnet slot 130a includes a first straight slot wall 170 close to the center of the installation area 150, and the two magnet slots 130a have two first straight slot walls 170. It is worth noting that when the cross-section of the installation area 150 is a geometric figure, the center of the installation area 150 is the center of the geometric figure. When the cross-section of the installation area 150 is a non-geometric figure, the center of the installation area 150 is the intersection of the line connecting the two points farthest apart in the circumferential direction and the line connecting the two points farthest apart in the radial direction. The angle θ formed by the two first straight slot walls 170 satisfies the above-mentioned relationship, thereby being able to affect the direct-axis magnetic circuit and the quadrature-axis magnetic circuit of the motor 200, thereby indirectly affecting the various performances of the motor 200. Regarding the output torque of the motor 200, when θ satisfies the aforementioned relationship, the reluctance torque component and the permanent magnet torque component of the motor 200 can be reasonably distributed, thereby increasing the output torque of the motor 200 without increasing the cost of the electromagnetic components. Specifically, the output torque of the motor 200 is composed of the reluctance torque component and the permanent magnet torque component, wherein the permanent magnet torque of the motor 200 is proportional to the amount of permanent magnets 210 used, and the reluctance torque is proportional to the ratio of the quadrature-axis inductance to the direct-axis inductance, which is directly related to the value of θ. Without increasing the amount of permanent magnets 210 used, reasonably setting the value of θ can increase the ratio of the quadrature-axis inductance to the direct-axis inductance of the motor 200, thereby increasing the reluctance torque component. When the output torque of the motor 200 is the same, the permanent magnet torque can be smaller, thereby reducing the amount of permanent magnets 210 used, thereby reducing costs.

[0080] Example 2

[0081] Based on the above embodiments, Figure 1 and Figure 2 As shown, in this embodiment, a specific description is made for the second slot end 132 of the magnet slot 130a away from the shaft hole 120. Furthermore, the magnet slot 130a includes a second slot end 132 away from the shaft hole 120, the distance between the two first slot ends 131 is smaller than the distance between the two second slot ends 132, the second slot end 132 extends toward the interior of the installation area 150, and the portion of the punching sheet body 110 located between the second slot end 132 and the outer peripheral edge of the punching sheet body 110 constitutes a second magnetic isolation bridge 160.

[0082] In this embodiment, the magnet slot 130a further includes a second slot end 132 away from the shaft hole 120. The second slot end 132 and the first slot end 131 are two opposite ends of the magnet slot 130a. Since there are two magnet slots 130a, there are also two second slot ends 132. The distance between the two first slot ends 131 is smaller than the distance between the two second slot ends 132, so the two magnet slots 130a are arranged in a V-shape on the sheet body 110. Furthermore, the second slot end 132 extends toward the interior of the mounting area 150, and the portion of the sheet body 110 located between the second slot end 132 and the outer periphery of the sheet body 110 forms a second magnetic isolation bridge 160. Since there are two second slot ends 132, there are two second magnetic isolation bridges 160 and one first magnetic isolation bridge 140 in one mounting portion 130. The double-isolated magnetic bridge structure can improve the mechanical strength of the rotor punching 100, optimize the rotor magnetic field distribution, significantly improve the electromagnetic torque of the motor 200 with the rotor punching 100, effectively improve the leakage and demagnetization of the permanent magnet 210 located in the magnet slot 130a, and disperse the centrifugal stress around the magnet slot 130a of the rotor punching 100 when the rotor punching 100 is working at high speed. This solves the problem that the mechanical strength of the rotor punching 100 of the motor 200 is difficult to meet the requirements at high speed, and realizes the design of the motor 200 with low leakage and high strength. , and can also significantly improve the utilization rate of the permanent magnet 210 and the power density of the motor 200, further improve the working performance of the motor 200, and at the same time weaken the torque pulsation of the motor 200 to a certain extent, reduce the operating noise of the motor 200, and improve the user's comfort; on the other hand, the air gap groove is located on the side of the first end face away from the shaft hole 120, so that the air gap groove can effectively improve the magnetic leakage of the punching body 110 while not affecting the d-axis and q-axis magnetic circuits of the motor 200, thereby ensuring sufficient permanent magnet torque of the motor 200.

[0083] Further, if Figure 1 and Figure 2 As shown, the rotor punching 100 further includes an assembly opening 180 . The assembly opening 180 is provided on the punching body 110 and is located between two adjacent mounting portions 130 among the plurality of mounting portions 130 . The assembly opening 180 is used for mounting a connector.

[0084] In this embodiment, the rotor punching 100 further includes an assembly opening 180 , which is provided between two adjacent mounting portions 130 . When multiple rotor punchings 100 are stacked to form a rotor core, the multiple assembly openings 180 extend axially through the assembly slots to form assembly slots. Connectors are provided in the assembly slots to securely connect the multiple rotor punchings 100 . Specifically, the connectors are rivets.

[0085] Example 3

[0086] According to a second aspect of the present invention, a rotor core is provided, comprising the rotor punching 100 provided in any one of the above embodiments.

[0087] The rotor core provided by the present invention includes the rotor punching 100 provided by any of the above designs, and therefore has all the beneficial effects of the rotor punching 100, which will not be described in detail here.

[0088] The rotor punching 100 provided by the present invention includes a punching body 110, an axial hole 120 and a plurality of mounting parts 130. The axial hole 120 is provided on the punching body 110, and the punching body 110 is made of silicon steel material. Silicon steel refers to silicon alloy steel with a silicon content of 1.0% to 4.5% and a carbon content of less than 0.08%. Silicon steel has the characteristics of high magnetic permeability, low coercive force, and large resistivity, so the hysteresis loss and eddy current loss are relatively small. The axial hole 120 is used to assemble the rotating shaft of the rotor. A plurality of mounting parts 130 are arranged on the punching body 110 around the axial hole 120. It is worth noting that the structure of each of the plurality of mounting parts 130 can be the same or partially the same, and can be adjusted according to actual needs. Each mounting portion 130 includes two magnet slots 130a. Each magnet slot 130a includes a first slot end 131 proximate the shaft hole 120. The slot wall of the first slot end 131 includes a straight slot section 131a and an arcuate slot section 131b connecting the two ends of the straight slot section 131a. The straight slot sections 131a of the two first slot ends 131 ensure that the width of the magnetic isolation bridge between the two straight slot sections 131a is not excessive, thereby affecting magnet demagnetization, magnetic leakage, and magnet utilization. By providing the arcuate slot sections 131b at both ends of the straight slot sections 131a, the arcuate slot sections 131b can provide structural reinforcement at the location where centrifugal force is concentrated (maximum force), reducing rotor stress and deformation under high speed and high torque conditions of the motor 200, improving the mechanical strength of the rotor, and enhancing the reliability of the motor 200. It is worth noting that the location on the punch body 110 where centrifugal force is concentrated refers to the location on the punch body 110 between the two arcuate slot sections 131b of the first slot ends 131. The present invention makes the first slot end 131 near the shaft hole 120 in each magnet slot 130a include a straight slot section 131a and an arc slot section 131b. On the basis of effectively improving the leakage magnetic field and demagnetization phenomenon of the permanent magnet 210 located in the magnet slot 130a, it can also reduce the stress and deformation of the rotor punching 100 under high speed and high torque of the motor 200, improve the mechanical strength of the rotor punching 100, enhance the reliability of the motor 200, solve the problem that the mechanical strength of the rotor punching 100 of the motor 200 is difficult to meet the requirements at high speed, and realize the design of the low leakage magnetic field and high strength motor 200.

[0089] Example 4

[0090] According to the third aspect of the present invention, Figure 6As shown, a motor 200 is provided, including a rotor core provided by any of the above designs.

[0091] The motor 200 provided by the present invention includes the rotor core provided by any of the above designs, and therefore has all the beneficial effects of the rotor core, which will not be described in detail here.

[0092] The rotor punching 100 provided by the present invention includes a punching body 110, an axial hole 120 and a plurality of mounting parts 130. The axial hole 120 is provided on the punching body 110, and the punching body 110 is made of silicon steel material. Silicon steel refers to silicon alloy steel with a silicon content of 1.0% to 4.5% and a carbon content of less than 0.08%. Silicon steel has the characteristics of high magnetic permeability, low coercive force, and large resistivity, so the hysteresis loss and eddy current loss are relatively small. The axial hole 120 is used to assemble the rotating shaft of the rotor. A plurality of mounting parts 130 are arranged on the punching body 110 around the axial hole 120. It is worth noting that the structure of each of the plurality of mounting parts 130 can be the same or partially the same, and can be adjusted according to actual needs. Each mounting portion 130 includes two magnet slots 130a. Each magnet slot 130a includes a first slot end 131 proximate the shaft hole 120. The slot wall of the first slot end 131 includes a straight slot section 131a and an arcuate slot section 131b connecting the two ends of the straight slot section 131a. The straight slot sections 131a of the two first slot ends 131 ensure that the width of the magnetic isolation bridge between the two straight slot sections 131a is not excessive, thereby affecting magnet demagnetization, magnetic leakage, and magnet utilization. By providing the arcuate slot sections 131b at both ends of the straight slot sections 131a, the arcuate slot sections 131b can provide structural reinforcement at the location where centrifugal force is concentrated (maximum force), reducing rotor stress and deformation under high speed and high torque conditions of the motor 200, improving the mechanical strength of the rotor, and enhancing the reliability of the motor 200. It is worth noting that the location on the punch body 110 where centrifugal force is concentrated refers to the location on the punch body 110 between the two arcuate slot sections 131b of the first slot ends 131. The present invention makes the first slot end 131 near the shaft hole 120 in each magnet slot 130a include a straight slot section 131a and an arc slot section 131b. On the basis of effectively improving the leakage magnetic field and demagnetization phenomenon of the permanent magnet 210 located in the magnet slot 130a, it can also reduce the stress and deformation of the rotor punching 100 under high speed and high torque of the motor 200, improve the mechanical strength of the rotor punching 100, enhance the reliability of the motor 200, solve the problem that the mechanical strength of the rotor punching 100 of the motor 200 is difficult to meet the requirements at high speed, and realize the design of the low leakage magnetic field and high strength motor 200.

[0093] Furthermore, the two magnet slots 130a of the rotor punchings 100 of the rotor core are respectively formed into slots along the axial direction of the rotor core. The motor 200 further includes two permanent magnets 210, which are disposed in the two slots in a one-to-one correspondence.

[0094] Furthermore, there is a gap between each of the two permanent magnets 210 and the first slot end 131 and / or the second slot end 132 of the rotor sheet 100 .

[0095] In this embodiment, there is a gap between each permanent magnet 210 and at least one of the two ends of the slot. The gap can play a magnetic isolation effect, which can further improve the leakage and demagnetization of the permanent magnet 210 located in the magnet slot 130a.

[0096] Furthermore, the motor 200 further includes a stator 220 . The stator 220 has an assembly cavity. The rotor core is disposed in the assembly cavity and is rotatable relative to the stator 220 .

[0097] Example 5

[0098] According to a fourth aspect of the present invention, a compressor 300 is provided, such as Figure 8 As shown, the motor 200 includes any one of the above designs.

[0099] The compressor 300 provided by the present invention includes the motor 200 provided by any of the above designs, and therefore has all the beneficial effects of the motor 200, which will not be described in detail here.

[0100] Specifically, the compressor 300 is a scroll compressor or a rotary compressor and includes a housing 310 . The housing 310 forms a cavity, and the motor 200 is accommodated in the housing 310 .

[0101] Specifically, the rotor punching 100 provided by the present invention includes a punching body 110, an axial hole 120 and a plurality of mounting portions 130. The axial hole 120 is provided on the punching body 110, and the punching body 110 is made of silicon steel material. Silicon steel refers to silicon alloy steel with a silicon content of 1.0% to 4.5% and a carbon content of less than 0.08%. Silicon steel has the characteristics of high magnetic permeability, low coercive force, and large resistivity, so the hysteresis loss and eddy current loss are relatively small. The axial hole 120 is used to assemble the rotating shaft of the rotor. A plurality of mounting portions 130 are arranged on the punching body 110 around the axial hole 120. It is worth noting that the structure of each of the plurality of mounting portions 130 can be the same or partially the same, and can be adjusted according to actual needs. Each mounting portion 130 includes two magnet slots 130a. Each magnet slot 130a includes a first slot end 131 proximate the shaft hole 120. The slot wall of the first slot end 131 includes a straight slot section 131a and an arcuate slot section 131b connecting the two ends of the straight slot section 131a. The straight slot sections 131a of the two first slot ends 131 ensure that the width of the magnetic isolation bridge between the two straight slot sections 131a is not excessive, thereby affecting magnet demagnetization, magnetic leakage, and magnet utilization. By providing the arcuate slot sections 131b at both ends of the straight slot sections 131a, the arcuate slot sections 131b can provide structural reinforcement at the location where centrifugal force is concentrated (maximum force), reducing rotor stress and deformation under high speed and high torque conditions of the motor 200, improving the mechanical strength of the rotor, and enhancing the reliability of the motor 200. It is worth noting that the location on the punch body 110 where centrifugal force is concentrated refers to the location on the punch body 110 between the two arcuate slot sections 131b of the first slot ends 131. The present invention makes the first slot end 131 near the shaft hole 120 in each magnet slot 130a include a straight slot section 131a and an arc slot section 131b. On the basis of effectively improving the leakage magnetic field and demagnetization phenomenon of the permanent magnet 210 located in the magnet slot 130a, it can also reduce the stress and deformation of the rotor punching 100 under high speed and high torque of the motor 200, improve the mechanical strength of the rotor punching 100, enhance the reliability of the motor 200, solve the problem that the mechanical strength of the rotor punching 100 of the motor 200 is difficult to meet the requirements at high speed, and realize the design of the low leakage magnetic field and high strength motor 200.

[0102] Specific embodiments

[0103] The present invention provides a rotor lamination 100, a permanent magnet motor, and a compressor 300 equipped with the same. The rotor core has multiple pairs of magnet slots 130a for inserting V-shaped permanent magnets 210. These slots 130a are symmetrically distributed around the outer circumference of the shaft hole 120 in the rotor core. Each pair of magnet slots 130a is provided with a second magnetic isolation bridge 160 near the inner side of the rotor's outer circumference. A first magnetic isolation bridge 140 is provided adjacent to each pair of magnet slots 130a. The first magnetic isolation bridge 140 includes a straight slot segment 131a, each having a minimum width w. The radius R of the rotor lamination 100 satisfies the following relationship: 0.012 ≤ w / R ≤ 0.02. Among them, it also includes an arc slot segment 131b connected to the straight slot segment 131a. The curvature radius r of the arc slot segment 131b has the following relationship with the radius R of the rotor punching 100: 0.015≤r / R≤0.02. According to the present invention, the stress and deformation of the rotor can be reduced under high speed and high torque conditions of the motor 200, the mechanical strength of the rotor can be improved, and the reliability of the motor 200 can be enhanced.

[0104] Furthermore, in the cross section of each rotor lamination 100, the line connecting the center of each set of magnetic poles and the axis of rotation of the rotor lamination 100 forms the d-axis, and the line passing through the center of the rotor lamination 100 and the midpoint between two adjacent magnetic poles is defined as the q-axis. The first magnetic isolation bridge 140 coincides with the d-axis. This effectively reduces stress and deformation in the rotor of the compressor 300 motor 200, enhances the mechanical strength of the rotor, and improves the reliability of the motor 200.

[0105] In the present invention, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; and "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0106] 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.

[0107] The foregoing description is merely a preferred embodiment of the present invention and is 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 are intended to be within the scope of protection of the present invention.

Claims

1. A rotor punching, characterized in that: include: Film processing body; An axial hole is provided on the punch body; A plurality of mounting portions are arranged on the punch body around the shaft hole, Each of the plurality of mounting portions comprises: Two magnet slots, each of the two magnet slots includes a first slot end adjacent to the shaft hole, wherein the first slot end includes a straight slot segment and an arcuate slot segment connected to both ends of the straight slot segment, and the location where the centrifugal force is concentrated on the punching sheet body is the punching sheet body between the two arcuate slot segments of the first slot ends; The portion of the punch body located between the two straight groove sections constitutes a first magnetic isolation bridge, and the ratio of the width w of the first magnetic isolation bridge to the radius R of the punch body is greater than 0.012 and less than 0.02; The curvature degrees of the two arc slot segments are the same or different, and at least one of the two arc slot segments is a circular arc segment, which includes an arc line located on the axial end face of the punch body, and the ratio of the curvature radius r of the arc line to the radius R of the punch body is greater than or equal to 0.015 and less than or equal to 0.

02.

2. The rotor punching according to claim 1, characterized in that: The ratio of the width w of the first magnetic isolation bridge to the number of pole pairs p of the rotor punching is greater than 0.2 and less than 0.

5.

3. The rotor punching according to claim 1, characterized in that: The width of the first magnetic isolation bridge is greater than 0.6 mm.

4. The rotor punching according to claim 1, characterized in that: The curvature radius of the arc line is greater than or equal to 0.8 mm.

5. The rotor punching according to any one of claims 1 to 3, characterized in that: The portion of the punch body located between the two magnet slots constitutes an installation area, and the magnet slot includes a first straight slot wall close to the center of the installation area. The angle θ formed by the two first straight slot walls is greater than or equal to 115° and less than or equal to 125°.

6. The rotor punching according to claim 5, characterized in that: The magnet slot includes a second slot end away from the axial hole, the distance between the two first slot ends is smaller than the distance between the two second slot ends, the second slot end extends toward the interior of the installation area, and the portion of the punching body located between the second slot end and the outer peripheral edge of the punching body constitutes a second magnetic isolation bridge.

7. The rotor punching according to any one of claims 1 to 3, characterized in that The rotor punching sheet further comprises: An assembly port is provided on the punch body and is located between two adjacent mounting portions among the plurality of mounting portions, and the assembly port is used for mounting a connector.

8. A rotor core, characterized in that: include: A rotor lamination according to any one of claims 1 to 7.

9. A motor, characterized in that: include: The rotor core according to claim 8, wherein two magnet slots of a plurality of rotor punchings of the rotor core respectively penetrate the rotor core in the axial direction to form slots; Two permanent magnets are disposed in the two slots in a one-to-one correspondence.

10. The motor according to claim 9, characterized in that There is a gap between each of the two permanent magnets and the first slot end and / or the second slot end of the rotor sheet.

11. A compressor, characterized in that: include: A motor as claimed in claim 9 or 10.

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