CN212304929U

CN212304929U - Rotor punching sheet, rotor core, motor and compressor

Info

Publication number: CN212304929U
Application number: CN202022186578.4U
Authority: CN
Inventors: 王玉龙; 毛临书; 邱小华; 江波; 李为谦
Original assignee: Anhui Meizhi Precision Manufacturing Co Ltd
Current assignee: Anhui Meizhi Precision Manufacturing Co Ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-01-05
Anticipated expiration: 2030-09-29

Abstract

The utility model provides a rotor punching, rotor core, motor and compressor. The rotor punching sheet comprises a punching sheet body, a shaft hole and a plurality of installation parts, wherein the shaft hole is formed in the punching sheet body. A plurality of installation portions are arranged on the punching sheet body around the shaft hole. Each installation department includes two magnet grooves in a plurality of installation portions, and each magnet groove includes the first groove end that is close to the shaft hole in two magnet grooves, and wherein, first groove end includes straight groove section and connects the arc groove section at straight groove section both ends. The utility model discloses a first groove end that is close to the shaft hole in making each magnet groove includes straight flute section and arc flute section, on the magnetic leakage of the permanent magnet that effectively improves to be located the magnet inslot and the basis of demagnetization phenomenon, can also reduce the high rotational speed of motor, rotor punching sheet stress deformation under the big moment of torsion circumstances, improve the mechanical strength of rotor punching sheet, the reinforcing motor reliability, solve the problem that the motor is difficult to satisfy the requirement at high rotational speed rotor punching sheet mechanical strength, realize the design of low magnetic leakage and high strength motor.

Description

Rotor punching sheet, rotor core, motor and compressor

Technical Field

The utility model relates to an electrical equipment technical field particularly, relates to a rotor punching, a rotor core, a motor and a compressor.

Background

At present, a rotor of a motor comprises a rotor punching sheet as a key component of the rotor, and the design quality of the rotor punching sheet directly determines the performance of the motor. In order to improve the phenomena of demagnetization and magnetic flux leakage of the magnetic steel of the motor, the utilization rate of the magnetic steel is improved. The width of the magnetic isolation bridge of the rotor punching sheet is reduced. However, when the motor is in a high-speed working condition, the magnetic isolation bridge of the rotor is stressed greatly, and the narrow magnetic isolation bridge is difficult to meet the structural strength requirement of the rotor at a high speed. Therefore, how to improve the structural strength of the rotor while reducing the magnetic flux leakage is a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The present invention aims at least solving one of the technical problems existing in the prior art or the related art.

Therefore, a first aspect of the present invention is to provide a rotor punching sheet.

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

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

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

In view of this, according to the utility model discloses a first aspect provides a rotor punching, and it includes towards piece body, shaft hole and a plurality of installation department, and wherein, the shaft hole sets up on towards the piece body. A plurality of installation portions are arranged on the punching sheet body around the shaft hole. Each installation department includes two magnet grooves in a plurality of installation portions, and each magnet groove includes the first groove end that is close to the shaft hole in two magnet grooves, and wherein, first groove end includes straight groove section and connects the arc groove section at straight groove section both ends.

The utility model provides a rotor punching is including towards piece body, shaft hole and a plurality of installation department. The shaft hole is opened on the punching sheet body, and the punching sheet body is made of silicon steel material. Wherein, the silicon steel is silicon alloy steel with 1.0-4.5% of silicon content and less than 0.08% of carbon content. Silicon steel has the characteristics of high magnetic permeability, low coercive force, large resistivity and the like, so that the ratio of hysteresis loss to eddy current loss is small. The shaft hole is used for assembling a rotating shaft of the rotor. The installation parts are arranged on the punching sheet body around the shaft hole, and it is worth explaining that the structure of each installation part in the installation parts can be the same or partially the same, and the installation parts can be adjusted according to actual needs. Each installation portion includes two magnet grooves, and each magnet groove includes the first groove end that is close to the shaft hole, and wherein the cell wall of first groove end includes straight groove section and connects the arc groove section at straight groove section both ends. The straight groove sections of the two first groove ends can ensure that the width of a magnetic isolation bridge between the two straight groove sections is not too large to influence the utilization rate of the magnetic steel, such as demagnetization and magnetic flux leakage of the magnetic steel. The arc groove sections are arranged at the two ends of the straight groove section, so that the arc groove sections can structurally reinforce the position where centrifugal force is concentrated (the stress is maximum), the high rotating speed of the motor is reduced, the stress and the deformation of the rotor under the condition of large torque are reduced, the mechanical strength of the rotor is improved, and the reliability of the motor is enhanced. It is worth to be noted that the position where the centrifugal force is concentrated on the punching sheet body refers to the punching sheet body between the arc groove sections of the two first groove ends. The utility model discloses a first groove end that is close to the shaft hole in making each magnet groove includes straight flute section and arc flute section, on the magnetic leakage of the permanent magnet that effectively improves to be located the magnet inslot and the basis of demagnetization phenomenon, can also reduce the high rotational speed of motor, rotor punching sheet stress deformation under the big moment of torsion circumstances, improve the mechanical strength of rotor punching sheet, the reinforcing motor reliability, solve the problem that the motor is difficult to satisfy the requirement at high rotational speed rotor punching sheet mechanical strength, realize the design of low magnetic leakage and high strength motor.

In a possible design, further, a part of the punching sheet body located between the two straight groove sections forms a first magnetism isolating bridge, and the ratio of the width w of the first magnetism isolating bridge to the radius R of the punching sheet body is greater than 0.012 and less than 0.02.

In the design, two magnet slots are provided with first slot ends close to the shaft hole, the two first slot ends are respectively provided with a straight slot section, part of the punching sheet body between the two straight slot sections forms a first magnetism isolating bridge, the ratio (w/R) between the width w of the first magnetism isolating bridge and the radius R of the punching sheet body meets the relationship, thereby the distribution condition of the rotor magnetic field can be optimized, the electromagnetic torque of the motor with the rotor punching sheet is obviously improved, the magnetic leakage and demagnetization phenomena of permanent magnets positioned in the magnet slots are effectively improved, the centrifugal stress at the periphery of the magnet slots of the rotor punching sheet under the working condition of high rotating speed is dispersed, the problem that the mechanical strength of the rotor punching sheet under the high rotating speed of the motor is difficult to meet the requirement is solved, the design of a low magnetic leakage and high strength motor is realized, in addition, the utilization rate of the permanent magnets and the power density of the motor can be obviously improved, further improve the working property of motor, improve user's comfort level.

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

In this design, ratio (w/p) between the width w of first magnetic isolation bridge and the number of pole pairs p of rotor punching satisfies above-mentioned relational expression, thereby can optimize the rotor magnetic field distribution condition, obviously promote the electromagnetic torque of the motor that has this rotor punching, effectively improve the magnetic leakage and the demagnetization of the permanent magnet that is located the magnet inslot, the peripheral centrifugal stress of magnet groove when dispersion rotor punching is high rotational speed operating mode, solve the problem that the motor is difficult to satisfy the requirement at high rotational speed rotor punching mechanical strength from this, realize the design of low magnetic leakage and high strength motor, furthermore, can also make the utilization ratio and the motor power density of permanent magnet can both obtain obviously improving, further improve the working property of motor, improve user's comfort level in use.

In one possible design, further, the width of the first magnetic shield bridge is greater than 0.6 mm.

In this design, the width through setting up first magnetism bridge that separates is greater than 0.6mm to ensure that first magnetism bridge can provide certain structure additional strengthening for punching the piece body, when the width of first magnetism bridge is less than 0.7mm, less width can increase the processing degree of difficulty on the one hand, on the other hand is satisfying the basis of magnetism demand, also can reduce the stress deformation of compressor motor's rotor punching, strengthen the mechanical strength of rotor punching, improve motor reliability.

In a possible design, further, at least one of the two arc groove sections is an arc section, the arc section includes an arc line located on the axial end face of the punching sheet body, and the ratio of the curvature radius R of the arc line to the radius R of the punching sheet body is greater than or equal to 0.015 and less than or equal to 0.02.

In this design, each first groove end has a straight groove section and an arc groove section connected to both ends of the straight groove section, i.e., the number of the arc groove sections is two. It is worth mentioning that the degree of curvature of the two arc groove sections may be the same or different. At least one arc groove section in two arc groove sections is the arc section, and two arc groove sections include an arc section and a non-arc section promptly, also can two arc groove sections include two arc sections. Further, this arc section is including being located the arc line on the axial terminal surface towards the piece body, makes the radius of curvature R of arc line and the radius R towards the piece body satisfy above-mentioned relation to can make and effectively improve towards the deformation problem of the comparatively concentrated position department of centrifugal force on the piece body, improve the mechanical strength of rotor punching, strengthen motor reliability, solve the problem that the rotor punching mechanical strength is difficult to satisfy the requirement under high rotational speed, realize the design of low magnetic leakage and high strength motor.

In a possible design, furthermore, the radius of curvature of the circular arc line is greater than or equal to 0.8 mm.

In this design, the radius of curvature of arc line satisfies above-mentioned value to can make the crooked degree of the cell wall of first groove end satisfy structural design demand, thereby can make and receive the deformation problem of the comparatively concentrated position department of centrifugal force on the punching sheet body and effectively improve, improve the mechanical strength of rotor punching sheet, strengthen motor reliability, solve the problem that the rotor punching sheet mechanical strength is difficult to satisfy the requirement under high rotational speed of motor, realize the design of low magnetic leakage and high strength motor.

In a possible design, further, a part of the punching sheet body located between the two magnet grooves forms a mounting area, the magnet grooves comprise first straight groove walls close to the center of the mounting area, and an included angle theta formed by the two first straight groove walls is greater than or equal to 115 degrees and smaller than or equal to 125 degrees.

In this design, a portion of the punch body is located between two magnet slots, and this portion of the punch body is called a mounting region. The magnet slots include a first straight slot wall near the center of the mounting region, and the two magnet slots have two first straight slot walls. It should be noted that, when the cross section of the mounting area is a geometric figure, the center of the mounting area is the center of the geometric figure. When the cross section of the mounting area is in a non-geometric figure, the center of the mounting area is the intersection point of the connecting line of the two points which are farthest away from each other in the circumferential direction and the connecting line of the two points which are farthest away from each other in the radial direction as the center. The included angle theta formed by the two first straight groove walls meets the relational expression, so that a straight-axis magnetic circuit and a quadrature-axis magnetic circuit of the motor can be influenced, and various performances of the motor can be indirectly influenced. Regarding the output torque of the motor, when theta satisfies the relation, the reluctance torque component and the permanent magnet torque component of the motor can be reasonably distributed, so that the output torque of the motor is improved under the condition of not increasing the cost of an electromagnetic part. Specifically, the output torque of the motor is composed of a reluctance torque component and a permanent magnet torque component, wherein the permanent magnet torque of the motor is in direct proportion to the permanent magnet consumption, the reluctance torque is in direct proportion to the ratio of the quadrature axis inductance to the direct axis inductance, and the ratio of the quadrature axis inductance to the direct axis inductance is directly related to the value of theta. When the motor torque with the same magnitude is output, the permanent magnet torque can be smaller, so that the using amount of the permanent magnet can be reduced, and the cost is reduced.

In a possible design, further, the magnet slot includes a second slot end far away from the shaft 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 towards the inside of the mounting area, and a part 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.

In this design, the magnet slot further includes a second slot end that is distal from the shaft aperture, the second slot end and the first slot end being opposite ends of the magnet slot. Since the number of the magnet slots is two, the number of the second slot ends is also two. The distance between the two first groove ends is smaller than the distance between the two second groove ends, and then the two magnet grooves are arranged on the punching sheet body in a V shape. Furthermore, the second groove end extends towards the inside of the mounting area, and a part of the punching sheet body between the second groove end and the peripheral edge of the punching sheet body forms a second magnetic isolation bridge. Because the number of the second groove ends is two, two second magnetic isolation bridges and one first magnetic isolation bridge are arranged in one installation part. The double magnetic isolation bridge structure can improve the mechanical strength of the rotor punching sheet, optimize the distribution condition of a rotor magnetic field, obviously improve the electromagnetic torque of a motor with the rotor punching sheet, effectively improve the magnetic leakage and demagnetization phenomena of a permanent magnet positioned in a magnet groove, disperse the centrifugal stress of the periphery of the magnet groove when the rotor punching sheet is in a high-rotating-speed working condition, solve the problem that the mechanical strength of the rotor punching sheet is difficult to meet the requirement under the high-rotating-speed working condition of the motor, realize the design of a low-magnetic-leakage and high-strength motor, in addition, the utilization rate of the permanent magnet and the power density of the motor can be obviously improved, further improve the working performance of the motor, weaken the torque pulsation of the motor to a certain extent, reduce the running noise of the motor and improve the use comfort level; on the other hand, the air gap groove is positioned on one side of the first end surface, which is far away from the shaft hole, so that the magnetic leakage of the punching sheet body can be effectively improved, the d-axis and q-axis magnetic circuits of the motor are not influenced, and the sufficient permanent magnet torque of the motor is ensured.

In a possible design, further, the rotor punching sheet further comprises an assembly opening, the assembly opening is arranged on the punching sheet body and located between two adjacent installation parts in the multiple installation parts, and the assembly opening is used for installing a connecting piece.

In this design, the rotor punching still includes the assembly mouth, sets up the assembly mouth between two adjacent installation departments, when a plurality of rotor punching piled up and form rotor core, and a plurality of assembly mouths run through in order constituting the assembly and lead to the groove along the axial, and the connecting piece is worn to locate in order to pass through a plurality of rotor punching fastening connection in the groove. In particular, the connecting member is a rivet.

According to the utility model discloses a second aspect provides a rotor core, the rotor punching that provides including the arbitrary design of above-mentioned.

The utility model provides a rotor core, including the rotor punching that any above-mentioned design provided, consequently have this rotor punching's whole beneficial effect, no longer give consideration to here.

According to the utility model discloses a third aspect provides a motor, including the rotor core that any design provided above provided.

The utility model provides a motor, including the rotor core that any above-mentioned design provided, consequently have this rotor core's whole beneficial effect, no longer give consideration to here.

In a possible design, further, two magnet slots of the plurality of rotor sheets of the rotor core penetrate along the axial direction of the rotor core to form slots respectively. The motor also comprises two permanent magnets which are arranged in the two slots in a one-to-one correspondence mode.

In one possible design, further, each of the two permanent magnets has a spacing from the first slot end and/or the second slot end of the rotor sheet.

In the design, a gap is formed between each permanent magnet and at least one of the two end parts of the slot, the gap can play a role in magnetic isolation, and the magnetic leakage and demagnetization phenomena of the permanent magnets positioned in the magnet slots can be further improved.

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

The utility model provides a compressor, including the motor that any above-mentioned design provided, consequently have the whole beneficial effect of this motor, no longer describe herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a schematic structural view of a rotor sheet according to an embodiment of the present invention;

fig. 2 shows a partial schematic view of a rotor sheet in an embodiment in accordance with the invention;

fig. 3 is a radial deformation comparison diagram of a rotor sheet according to an embodiment of the present invention and a rotor sheet of the related art;

fig. 4 is a diagram illustrating an overall deformation comparison of a rotor sheet according to an embodiment of the present invention and a rotor sheet in the related art;

fig. 5 shows an equivalent stress comparison diagram of a rotor sheet in an embodiment according to the present invention and a rotor sheet in the related art;

fig. 6 shows a schematic structural view of the electric machine in an embodiment according to the invention;

fig. 7 shows a trend graph of the ratio of the width of the first magnetic isolation bridge of the rotor lamination to the radius of the lamination body and the stress applied to the rotor according to an embodiment of the present invention;

fig. 8 shows a schematic view of a compressor according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 8 is:

100 parts of the punching sheets of the rotor,

110, punching a sheet body, wherein the punching sheet body,

120 shaft holes are arranged in the upper part of the shaft,

130, 130a magnet slot, 130a,

131a first groove end, 131a straight groove section, 131b arc groove section,

132 at the end of the second slot, and,

140 a first magnetic shield bridge is provided,

150 of the area of installation of the device,

160 of the second magnetic shield bridge is arranged,

170 a first straight slot wall of the first slot,

180 of the assembly opening are arranged at the bottom of the box body,

200 of the motor, and the motor is arranged,

210 a permanent magnet, and a permanent magnet,

a 220 stator (a) and a second stator (b),

300 of a compressor is set up in the compressor,

310 housing.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A rotor punching sheet 100, a rotor core, a motor 200, and a compressor 300 provided according to some embodiments of the present invention are described below with reference to fig. 1 to 8.

Example one

According to a first aspect of the present invention, as shown in fig. 1 and fig. 2, a rotor punching sheet 100 is provided, which includes a punching sheet body 110, a shaft hole 120 and a plurality of installation portions 130, wherein the shaft hole 120 is disposed on the punching sheet body 110. The plurality of mounting portions 130 are disposed on the punch body 110 around the shaft 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 shaft hole 120, wherein the first slot end 131 includes a straight slot segment 131a and an arc slot segment 131b connected to both ends of the straight slot segment 131 a.

The utility model provides a rotor punching sheet 100 includes towards piece body 110, shaft hole 120 and a plurality of installation department 130. The shaft hole 120 is formed in the punching sheet body 110, and the punching sheet body 110 is made of a silicon steel material. Wherein, the silicon steel is silicon alloy steel with 1.0-4.5% of silicon content and less than 0.08% of carbon content. Silicon steel has the characteristics of high magnetic permeability, low coercive force, large resistivity and the like, so that the ratio of hysteresis loss to eddy current loss is small. The shaft hole 120 is used for assembling a rotation shaft of the rotor. The plurality of mounting portions 130 are disposed on the sheet punching body 110 around the shaft hole 120, and it should be noted that each of the mounting portions 130 in the plurality of mounting portions 130 may have the same structure or may be partially the same structure, and may be adjusted according to actual needs. Each mounting portion 130 includes two magnet slots 130a, and each magnet slot 130a includes a first slot end 131 adjacent to the shaft hole 120, wherein a slot wall of the first slot end 131 includes a straight slot segment 131a and an arc slot segment 131b connected at both ends of the straight slot segment 131 a. The straight slot segments 131a of the two first slot ends 131 can ensure that the width of the magnetic separation bridge between the two straight slot segments 131a is not too large to affect the demagnetization and magnetic flux leakage of the magnetic steel and the utilization rate of the magnetic steel. By arranging the arc groove sections 131b at the two ends of the straight groove section 131a, the arc groove sections 131b can structurally reinforce the position where the centrifugal force is concentrated (the stress is the largest), so that the high rotating speed of the motor 200 and the stress and deformation of the rotor under the condition of large torque are reduced, the mechanical strength of the rotor is improved, and the reliability of the motor 200 is enhanced. It should be noted that the position on the punching sheet body 110 where the centrifugal force is concentrated is the punching sheet body 110 between the arc groove segments 131b of the two first groove ends 131. The utility model discloses a make the first groove end 131 that is close to shaft hole 120 in each magnet groove 130a include straight flute section 131a and arc flute section 131b, on the basis of effectively improving the magnetic leakage and the demagnetization phenomenon that are located the permanent magnet 210 in magnet groove 130a, can also reduce the high rotational speed of motor 200, rotor punching sheet 100 stress deformation under the big moment of torsion circumstances, improve the mechanical strength of rotor punching sheet 100, strengthen motor 200 reliability, solve motor 200 and be difficult to satisfy the problem of requirement at high rotational speed rotor punching sheet 100 mechanical strength, realize low magnetic leakage and high strength motor 200's design.

Further, as shown in fig. 1, fig. 2 and fig. 7, a part of the punching sheet body 110 located between the two straight groove sections 131a forms a first magnetic isolation bridge 140, and a ratio of a width w of the first magnetic isolation bridge 140 to a radius R of the punching sheet body 110 is greater than 0.012 and less than 0.02.

In this embodiment, two magnet slots 130a each have a first slot end 131 close to the shaft hole 120, the two first slot ends 131 each have a straight slot segment 131a, a part of the lamination body 110 between the two straight slot segments 131a forms a first magnetic isolation bridge 140, and a ratio (w/R) between a width w of the first magnetic isolation bridge 140 and a radius R of the lamination body 110 satisfies the above relationship, as shown in fig. 3 and 4, so as to optimize a rotor magnetic field distribution condition, significantly improve an electromagnetic torque of the motor 200 having the rotor lamination 100, effectively improve magnetic leakage and demagnetization phenomena of the permanent magnets 210 located in the magnet slots 130a, disperse a centrifugal stress around the magnet slots 130a when the rotor lamination 100 is in a high-speed working condition, thereby solving a problem that the mechanical strength of the rotor lamination 100 is difficult to satisfy requirements at a high speed of the motor 200, and implement a design of the low-magnetic leakage and high-strength motor 200, in addition, the utilization rate of the permanent magnet 210 and the power density of the motor 200 can be obviously improved, the working performance of the motor 200 is further improved, and the use comfort of a user is improved. As shown in fig. 7, when the ratio of the width w of the first magnetic isolation bridge 140 to the radius R of the punching sheet body 110 satisfies the above range, the stress applied to the punching sheet body 110 is less than 230 Mpa.

Further, as shown in fig. 1 and 2, a ratio of the width w of the first magnetic isolation bridge 140 to the pole pair number p of the rotor sheet 100 is greater than 0.2 and less than 0.5.

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 relational expression, as shown in fig. 3 and fig. 5, so as to optimize the distribution of the rotor magnetic field, significantly improve the electromagnetic torque of the motor 200 with the rotor sheet 100, effectively improve the magnetic leakage and demagnetization phenomena of the permanent magnets 210 located in the magnet slots 130a, and disperse the centrifugal stress around the magnet slots 130a when the rotor sheet 100 is in a high-speed working condition, thereby solving the problem that the mechanical strength of the rotor sheet 100 is difficult to meet the requirement at a high speed of the motor 200, and realizing the design of the motor 200 with low magnetic leakage and high strength, in addition, the utilization rate of the permanent magnets 210 and the power density of the motor 200 can be significantly improved, further improve the working performance of the motor 200, and improve the use comfort of users.

Further, as shown in fig. 1 and 2, the width of the first magnetic bridge 140 is greater than 0.6 mm.

In this embodiment, the width of the first magnetic isolation bridge 140 is greater than 0.6mm, so as to ensure that the first magnetic isolation bridge 140 can provide a certain structural reinforcement for the punching sheet body 110, when the width of the first magnetic isolation bridge 140 is less than 0.7mm, on one hand, the smaller width can increase the processing difficulty, on the other hand, on the basis of meeting the magnetic isolation requirement, the stress deformation of the rotor punching sheet 100 of the motor 200 of the compressor 300 can also be reduced, the mechanical strength of the rotor punching sheet 100 is enhanced, and the reliability of the motor 200 is improved.

Further, as shown in fig. 1 and fig. 2, at least one arc groove segment 131b of the two arc groove segments 131b is an arc segment, the arc segment includes an arc line located on an axial end surface of the punching sheet body 110, and a ratio of a curvature radius R of the arc line to a radius R of the punching sheet body 110 is greater than or equal to 0.015 and less than or equal to 0.02.

In this embodiment, each first slot end 131 has a straight slot segment 131a and an arc slot segment 131b connected to both ends of the straight slot segment 131a, i.e., the number of the arc slot segments 131b is two. It should be noted that the two arc groove segments 131b may be bent to the same degree or different degrees. At least one arc groove section 131b of the two arc groove sections 131b is an arc section, that is, the two arc groove sections 131b include an arc section and a non-arc section, or the two arc groove sections 131b include two arc sections. Further, the arc segment includes an arc line located on the axial end face of the punching sheet body 110, and the curvature radius R of the arc line and the radius R of the punching sheet body 110 satisfy the above relationship, so that the deformation problem of the position on the punching sheet body 110, where centrifugal force is concentrated, is effectively improved, the mechanical strength of the rotor punching sheet 100 is improved, the reliability of the motor 200 is enhanced, the problem that the mechanical strength of the rotor punching sheet 100 is difficult to meet requirements at a high rotation speed of the motor 200 is solved, and the design of the low-leakage and high-strength motor 200 is realized.

Furthermore, the curvature radius of the arc line is more than or equal to 0.8 mm.

In this embodiment, the curvature radius of the arc line satisfies the above value, so that the curvature of the slot wall of the first slot end 131 satisfies the structural design requirement, thereby effectively improving the deformation of the punching sheet body 110 at a position where centrifugal force is concentrated, improving the mechanical strength of the rotor punching sheet 100, enhancing the reliability of the motor 200, solving the problem that the mechanical strength of the rotor punching sheet 100 is difficult to satisfy the requirement at a high rotation speed of the motor 200, and realizing the design of the motor 200 with low magnetic leakage and high strength.

Further, as shown in fig. 1 and fig. 2, a mounting region 150 is formed by a portion of the punching sheet body 110 located between two magnet slots 130a, the magnet slot 130a includes a first straight slot wall 170 close to the center of the mounting region 150, and an included angle θ formed by the two first straight slot walls 170 is greater than or equal to 115 ° and smaller than or equal to 125 °.

In this embodiment, a portion of the punch body 110 is located between two magnet slots 130a, and the portion of the punch body 110 is referred to as a mounting region 150. The magnet slots 130a include a first straight slot wall 170 near the center of the mounting region 150, and the two magnet slots 130a have two first straight slot walls 170. It should be noted that when the cross section of the mounting area 150 has a geometric shape, the center of the mounting area 150 is the center of the geometric shape. When the cross section of the mounting region 150 is a non-geometric figure, the center of the mounting region 150 is the intersection point of the two points which are farthest away from each other in the circumferential direction and the two points which are farthest away from each other in the radial direction. The included angle θ formed by the two first straight groove walls 170 satisfies the above relation, so that the direct-axis magnetic circuit and the quadrature-axis magnetic circuit of the motor 200 can be influenced, and various performances of the motor 200 can be indirectly influenced. Regarding the output torque of the motor 200, when θ satisfies the foregoing 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 a reluctance torque component and a permanent magnet torque component, wherein the permanent magnet torque of the motor 200 is in direct proportion to the amount of the permanent magnet 210, the reluctance torque is in direct proportion to the ratio of the quadrature axis inductance to the direct axis inductance, and the ratio of the quadrature axis inductance to the direct axis inductance is directly related to the value of θ, and under the condition that the amount of the permanent magnet 210 is not increased, the value of θ is reasonably set, so that the ratio of the quadrature axis inductance to the direct axis inductance of the motor 200 can be increased, and the reluctance torque component is improved. When the same torque of the motor 200 is output, the permanent magnet torque can be smaller, so that the use amount of the permanent magnet 210 can be reduced, and the cost is reduced.

Example two

On the basis of the foregoing embodiment, as shown in fig. 1 and fig. 2, in this embodiment, a specific description is made on a second slot end 132 of the magnet slot 130a away from the shaft hole 120, and further, the magnet slot 130a includes the second slot end 132 away from the shaft hole 120, a distance between the two first slot ends 131 is smaller than a distance between the two second slot ends 132, the second slot end 132 extends toward the inside of the mounting area 150, and a 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.

In this embodiment, the magnet slot 130a further includes a second slot end 132 distal from the shaft aperture 120, the second slot end 132 and the first slot end 131 being opposite ends of the magnet slot 130 a. Since the number of the magnet slots 130a is two, the number of the second slot ends 132 is also two. The distance between the two first slot ends 131 is smaller than the distance between the two second slot ends 132, and the two magnet slots 130a are arranged on the punching sheet body 110 in a V shape. Further, the second slot end 132 extends towards the inside of the mounting area 150, and a 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 forms a second magnetic isolation bridge 160. Since the number of the second slot ends 132 is two, two second magnetic bridges 160 and one first magnetic bridge 140 are provided in one mounting portion 130. The double magnetic isolation bridge structure can improve the mechanical strength of the rotor punching sheet 100, optimize the distribution condition of a rotor magnetic field, obviously improve the electromagnetic torque of the motor 200 with the rotor punching sheet 100, effectively improve the magnetic leakage and demagnetization phenomena of the permanent magnet 210 positioned in the magnet groove 130a, disperse the centrifugal stress around the magnet groove 130a when the rotor punching sheet 100 is in a high-speed working condition, thereby solving the problem that the mechanical strength of the rotor punching sheet 100 is difficult to meet the requirement under the high-speed working condition of the motor 200, realize the design of the motor 200 with low magnetic leakage and high strength, in addition, the utilization rate of the permanent magnet 210 and the power density of the motor 200 can be obviously improved, further improve the working performance of the motor 200, simultaneously weaken the torque pulsation of the motor 200 to a certain extent, reduce the running noise of the motor 200 and improve the use comfort level of users; on the other hand, the air gap slot is located on the side of the first end surface, which is far away from the shaft hole 120, so that the magnetic leakage of the punching sheet body 110 can be effectively improved, the d-axis and q-axis magnetic circuits of the motor 200 are not affected, and the sufficient permanent magnet torque of the motor 200 is ensured.

Further, as shown in fig. 1 and fig. 2, the rotor punching sheet 100 further includes an assembly opening 180, the assembly opening 180 is disposed on the punching sheet body 110 and located between two adjacent mounting portions 130 of the plurality of mounting portions 130, and the assembly opening 180 is used for mounting a connecting member.

In this embodiment, the rotor sheet 100 further includes an assembly opening 180, the assembly opening 180 is disposed between two adjacent mounting portions 130, when a plurality of rotor sheets 100 are stacked to form a rotor core, the assembly openings 180 axially penetrate through the assembly opening to form an assembly through slot, and a connecting member penetrates through the assembly through slot to tightly connect the plurality of rotor sheets 100. In particular, the connecting member is a rivet.

EXAMPLE III

According to a second aspect of the present invention, a rotor core is provided, which includes the rotor sheet 100 provided in any one of the above embodiments.

The utility model provides a rotor core, including the rotor punching 100 that any above-mentioned design provided, consequently have this rotor punching 100's whole beneficial effect, no longer give consideration to here.

Example four

According to a third aspect of the present invention, as shown in fig. 6, there is provided a motor 200 including a rotor core provided by any of the above-described designs.

The utility model provides a motor 200, including the rotor core that any of the above-mentioned designs provided, consequently have this rotor core's whole beneficial effect, no longer describe herein.

Further, the two magnet slots 130a of the plurality of rotor sheets 100 of the rotor core penetrate in the axial direction of the rotor core to form slots respectively. The motor 200 further includes two permanent magnets 210, and the two permanent magnets 210 are disposed in the two slots in a one-to-one correspondence.

Further, each of the two permanent magnets 210 has a space with the first slot end 131 and/or the second slot end 132 of the rotor sheet 100.

In this embodiment, each permanent magnet 210 has a space with at least one of the two ends of the slot, and the space can play a role of magnetic isolation, which can further improve the magnetic leakage and demagnetization phenomena of the permanent magnet 210 located in the magnet slot 130 a.

Further, the motor 200 further includes a stator 220, and the stator 220 has an assembly cavity in which the rotor core is disposed and is rotatable with respect to the stator 220.

EXAMPLE five

According to a fourth aspect of the present invention, there is provided a compressor 300, as shown in fig. 8, comprising a motor 200 provided by any of the above designs.

The utility model provides a compressor 300, including the motor 200 that any design of the aforesaid provided, consequently have all beneficial effects of this motor 200, no longer describe herein.

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

Specifically, the utility model provides a rotor punching sheet 100 includes towards piece body 110, shaft hole 120 and a plurality of installation department 130. The shaft hole 120 is formed in the punching sheet body 110, and the punching sheet body 110 is made of a silicon steel material. Wherein, the silicon steel is silicon alloy steel with 1.0-4.5% of silicon content and less than 0.08% of carbon content. Silicon steel has the characteristics of high magnetic permeability, low coercive force, large resistivity and the like, so that the ratio of hysteresis loss to eddy current loss is small. The shaft hole 120 is used for assembling a rotation shaft of the rotor. The plurality of mounting portions 130 are disposed on the sheet punching body 110 around the shaft hole 120, and it should be noted that each of the mounting portions 130 in the plurality of mounting portions 130 may have the same structure or may be partially the same structure, and may be adjusted according to actual needs. Each mounting portion 130 includes two magnet slots 130a, and each magnet slot 130a includes a first slot end 131 adjacent to the shaft hole 120, wherein a slot wall of the first slot end 131 includes a straight slot segment 131a and an arc slot segment 131b connected at both ends of the straight slot segment 131 a. The straight slot segments 131a of the two first slot ends 131 can ensure that the width of the magnetic separation bridge between the two straight slot segments 131a is not too large to affect the demagnetization and magnetic flux leakage of the magnetic steel and the utilization rate of the magnetic steel. By arranging the arc groove sections 131b at the two ends of the straight groove section 131a, the arc groove sections 131b can structurally reinforce the position where the centrifugal force is concentrated (the stress is the largest), so that the high rotating speed of the motor 200 and the stress and deformation of the rotor under the condition of large torque are reduced, the mechanical strength of the rotor is improved, and the reliability of the motor 200 is enhanced. It should be noted that the position on the punching sheet body 110 where the centrifugal force is concentrated is the punching sheet body 110 between the arc groove segments 131b of the two first groove ends 131. The utility model discloses a make the first groove end 131 that is close to shaft hole 120 in each magnet groove 130a include straight flute section 131a and arc flute section 131b, on the basis of effectively improving the magnetic leakage and the demagnetization phenomenon that are located the permanent magnet 210 in magnet groove 130a, can also reduce the high rotational speed of motor 200, rotor punching sheet 100 stress deformation under the big moment of torsion circumstances, improve the mechanical strength of rotor punching sheet 100, strengthen motor 200 reliability, solve motor 200 and be difficult to satisfy the problem of requirement at high rotational speed rotor punching sheet 100 mechanical strength, realize low magnetic leakage and high strength motor 200's design.

Detailed description of the preferred embodiments

The utility model provides a rotor punching 100, permanent-magnet machine and have compressor 300 of this motor. Wherein, the rotor core has a plurality of pairs of magnet slots 130a for inserting the V-shaped permanent magnet 210, the plurality of magnet slots 130a are symmetrically distributed around the 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 outer circumference of the rotor, and each pair of magnet slots 130a is provided with a first magnetic isolation bridge 140 at the adjacent side. The first magnetic isolation bridge 140 includes a straight groove section 131a, the minimum width of the straight groove section 131a is w, and the radius R of the rotor sheet 100 satisfies the following relationship: w/R is more than or equal to 0.012 and less than or equal to 0.02. Wherein, still include the arc groove section 131b of being connected with straight groove section 131a, arc groove section 131b bending radian curvature radius R has following relation with rotor sheet 100 radius R: 0.015 is less than or equal to R/R is less than or equal to 0.02, according to the utility model discloses can reduce the high rotational speed of motor 200, rotor stress and deformation under the big moment of torsion condition improve the mechanical strength of rotor, reinforcing motor 200 reliability.

Further, on the cross section of each rotor sheet 100, a line connecting the center of each group of magnetic poles and the axis of the rotating shaft of the rotor sheet 100 forms a d-axis, a straight line passing through the center of the rotor sheet 100 and the midpoint between two adjacent magnetic poles is set as a q-axis, and the first magnetic bridge 140 coincides with the d-axis. Therefore, the stress deformation of the rotor of the motor 200 of the compressor 300 can be effectively reduced, the mechanical strength of the rotor is enhanced, and the reliability of the motor 200 is improved.

In the present application, the term "plurality" means two or more unless expressly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor punching sheet is characterized by comprising:

punching a sheet body;

the shaft hole is arranged on the punching sheet body;

a plurality of mounting parts arranged on the punching sheet body around the shaft hole,

each of the plurality of mounting portions includes:

each of the two magnet grooves comprises a first groove end close to the shaft hole, wherein the first groove end comprises a straight groove section and arc groove sections connected to two ends of the straight groove section.

2. The rotor sheet as recited in claim 1,

the part of the punching sheet body between the two straight groove sections forms 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 larger than 0.012 and smaller than 0.02.

3. The rotor sheet as recited in claim 2,

the ratio of the width w of the first magnetic isolation bridge to the number p of pole pairs of the rotor punching sheet is larger than 0.2 and smaller than 0.5.

4. The rotor sheet as recited in claim 2,

the width of the first magnetism isolating bridge is larger than 0.6 mm.

5. The rotor sheet according to any one of claims 1 to 4,

at least one of the two arc groove sections is an arc section, the arc section comprises an arc line located on the axial end face of the punching sheet body, and the ratio of the curvature radius R of the arc line to the radius R of the punching sheet body is greater than or equal to 0.015 and smaller than or equal to 0.02.

6. The rotor sheet as recited in claim 5,

the curvature radius of the arc line is more than or equal to 0.8 mm.

7. The rotor sheet according to any one of claims 1 to 4,

the part of the punching sheet body between the two magnet grooves forms a mounting area, the magnet grooves comprise first straight groove walls close to the center of the mounting area, and an included angle theta formed by the two first straight groove walls is larger than or equal to 115 degrees and smaller than or equal to 125 degrees.

8. The rotor sheet as recited in claim 7,

the magnet groove comprises second groove ends far away from the shaft hole, the distance between the two first groove ends is smaller than the distance between the two second groove ends, the second groove ends extend towards the inside of the mounting area, and the part between the second groove ends and the peripheral edge of the punching sheet body forms a second magnetic isolation bridge.

9. The rotor sheet according to any one of claims 1 to 4, further comprising:

and the assembly opening is arranged on the punching sheet body and is positioned between two adjacent installation parts in the installation parts, and the assembly opening is used for installing a connecting piece.

10. A rotor core, comprising: the rotor sheet as recited in any one of claims 1 to 9.

11. An electric machine, comprising:

the rotor core according to claim 10, wherein two magnet slots of the plurality of rotor sheets of the rotor core penetrate along the axial direction of the rotor core to form slots respectively;

and the two permanent magnets are arranged in the two slots in a one-to-one correspondence manner.

12. The electric machine of claim 11,

and a space is reserved between each permanent magnet of the two permanent magnets and the first slot end and/or the second slot end of the rotor punching sheet.

13. A compressor, comprising: an electrical machine as claimed in claim 11 or 12.