CN118432392B - Permanent magnet synchronous rotor punching sheet, permanent magnet synchronous rotor and permanent magnet synchronous motor - Google Patents
Permanent magnet synchronous rotor punching sheet, permanent magnet synchronous rotor and permanent magnet synchronous motor Download PDFInfo
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- CN118432392B CN118432392B CN202410897606.3A CN202410897606A CN118432392B CN 118432392 B CN118432392 B CN 118432392B CN 202410897606 A CN202410897606 A CN 202410897606A CN 118432392 B CN118432392 B CN 118432392B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 58
- 238000004080 punching Methods 0.000 title claims abstract description 57
- 238000002955 isolation Methods 0.000 claims abstract description 65
- 230000005389 magnetism Effects 0.000 claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims description 65
- 239000010959 steel Substances 0.000 claims description 65
- 239000013585 weight reducing agent Substances 0.000 claims description 57
- 238000009826 distribution Methods 0.000 abstract description 22
- 230000010349 pulsation Effects 0.000 abstract description 20
- 238000003475 lamination Methods 0.000 description 8
- 238000004088 simulation Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
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Abstract
The invention provides a permanent magnet synchronous rotor punching sheet, a permanent magnet synchronous rotor and a permanent magnet synchronous motor, wherein the permanent magnet synchronous rotor punching sheet comprises: the weight reducing groove is formed by rounding the positions of three corners of the weight reducing groove on the basis of the triangular groove, and comprises a weight reducing groove first arc section formed by rounding one corner, wherein the weight reducing groove first arc section is opposite to the magnetic isolating bridge in the radial direction of the shaft hole; an included angle a is formed between extension lines of the first straight sections of the weight reducing grooves, a midpoint of the length of each magnetic isolation bridge arc section is taken as a tangent line, an included angle b is formed between midpoint tangents of the two magnetic isolation bridge arc sections, and a constraint relation exists: a/b=0.78 to 1. According to the invention, the weight of the rotor is reduced under the condition that the stress release of the magnetic circuit and the magnetism isolating bridge is not affected, and the moment of inertia of the rotor is reduced, so that the stress is reduced, the strength of the rotor is improved, the distribution of magnetic force lines is optimized, and the torque pulsation is further reduced.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a permanent magnet synchronous rotor punching sheet, a permanent magnet synchronous rotor and a permanent magnet synchronous motor.
Background
Permanent magnet synchronous motors are becoming one of the main motors of automobile driving systems due to their excellent characteristics of high efficiency, high power factor, high power density, and the like. In the design process of the permanent magnet synchronous motor, the motor must be capable of safely running in the rotating speed range required by the performance index, so that the mechanical strength of the motor rotor structure must be checked, and the motor rotor is ensured not to be seriously deformed and damaged under the action of centrifugal force when rotating at a high speed.
Centrifugal force generated when the built-in permanent magnet rotor runs at high speed mainly acts on the rotor magnetism isolating bridge, and damage to the rotor magnetism isolating bridge is extremely easy to cause. The mechanical strength of the magnetic isolation bridge can be enhanced by increasing the width of the magnetic isolation bridge, but the magnetic leakage of the motor is increased and the electromagnetic performance of the permanent magnet motor is reduced along with the increase of the width of the magnetic isolation bridge. In addition, the partial area of the rotor core, which is close to the rotating shaft, has small contribution to electromagnetic performance, and the excessive mass can increase centrifugal force load, reduce the fatigue life of the rotor core and increase design cost.
Because the permanent magnet synchronous motor in the prior art has the technical problems of magnetic bridge stress, torque pulsation and the like, the invention designs a permanent magnet synchronous rotor punching sheet, a permanent magnet synchronous rotor and a permanent magnet synchronous motor.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of magnetic bridge stress isolation and torque pulsation of the permanent magnet synchronous motor in the prior art, thereby providing a permanent magnet synchronous rotor punching sheet, a permanent magnet synchronous rotor and a permanent magnet synchronous motor.
In order to solve the above problems, the present invention provides a permanent magnet synchronous rotor sheet, which includes:
The magnetic steel grooves are positioned at the radial outer sides of the shaft holes, the magnetic isolation bridges are arranged between two adjacent magnetic steel grooves, the weight reduction grooves are formed in the positions which are radially inner sides of the magnetic isolation bridges and are positioned at the radial outer sides of the shaft holes, the weight reduction grooves are grooves formed by rounding the positions of three corners of the weight reduction grooves on the basis of triangular grooves, and each weight reduction groove comprises a weight reduction groove first arc section formed by rounding one corner, and the weight reduction groove first arc section is opposite to the magnetic isolation bridge in the radial direction of the shaft hole;
Two straight edges of the weight-reducing groove, which are respectively connected with the first arc sections of the weight-reducing groove, are two first straight sections of the weight-reducing groove, and an included angle a, namely an included angle between the first straight lines of the weight-reducing groove, is formed between the extension lines of the two first straight sections of the weight-reducing groove;
In the same magnetic pole, in two adjacent magnetic steel grooves, the radial innermost side of one magnetic steel groove is provided with a first magnetic steel groove arc edge, the radial innermost side of the other magnetic steel groove is provided with a second magnetic steel groove arc edge, the first magnetic steel groove arc edge and the second magnetic steel groove arc edge are oppositely arranged to form two opposite arc sections of the magnetic isolation bridge, namely magnetic isolation bridge arc sections, a midpoint of the length of each magnetic isolation bridge arc section is taken as a tangent line, namely a midpoint tangent line of the magnetic isolation bridge arc section, so that an included angle b is formed between midpoint tangent lines of the two magnetic isolation bridge arc sections, namely an included angle between midpoint tangent lines of the magnetic isolation bridge arc sections;
and there is a constraint relationship: a/b=0.78 to 1.
In some embodiments of the present invention, in some embodiments,
The weight-reducing groove further comprises two weight-reducing groove third arc sections formed by rounding at the other two corners of the triangular groove, the two weight-reducing groove third arc sections are connected through a weight-reducing groove second arc section, and the weight-reducing groove second arc sections are opposite to the shaft hole in the radial direction of the shaft hole.
In some embodiments of the present invention, in some embodiments,
The rounding of the weight-reducing groove is an inscribed circle tangent to two adjacent sides of the weight-reducing groove, the second arc section of the weight-reducing groove is an arc section made by taking two endpoints of opposite straight sides of the triangular groove and the shaft hole as endpoints, and the circle center of the second arc section of the weight-reducing groove coincides with the center of the shaft hole.
In some embodiments of the present invention, in some embodiments,
In the same magnetic pole, in two adjacent magnetic steel grooves, a first magnetic steel groove straight edge is connected with the arc edge of the first magnetic steel groove, a second magnetic steel groove straight edge is connected with the arc edge of the second magnetic steel groove, the first magnetic steel groove straight edge and the second magnetic steel groove straight edge are oppositely arranged, and a straight section of the magnetic isolation bridge, namely a straight line section of the magnetic isolation bridge, is formed between the first magnetic steel groove straight edge and the second magnetic steel groove straight edge.
In some embodiments of the present invention, in some embodiments,
The center line of the weight-reducing groove is a connecting line of the center of the shaft hole and the length midpoint of the first arc section of the weight-reducing groove, namely the center line of the weight-reducing groove, and the center line of the weight-reducing groove also passes through the length midpoint of the second arc section of the weight-reducing groove;
The central line of the magnetic isolation bridge is a bisector of the width of the magnetic isolation bridge along the circumferential direction, namely the central line of the magnetic isolation bridge, and the central line of the magnetic isolation bridge passes through the center of the shaft hole;
an included angle e is formed between the center line of the weight-reducing groove and the center line of the magnetic isolation bridge, namely an included angle between the center line of the weight-reducing groove and the center line of the magnetic isolation bridge, and the included angle e is the oblique polar angle alpha of the rotor divided by the number of sections of the rotor.
In some embodiments of the present invention, in some embodiments,
The number of the rotor punching pieces in the rotor axial direction is two, and the rotor inclined pole angle alpha=3.75 degrees and e=1.875 degrees.
In some embodiments of the present invention, in some embodiments,
The radius of the first arc section of the weight-reducing groove is r c1, and the radius of the third arc section of the weight-reducing groove is r c3,rc1=2~4mm,rc3 =2-4 mm.
In some embodiments of the present invention, in some embodiments,
The center line of the weight-reducing groove is a connecting line of the center of the shaft hole and the length midpoint of the first arc section of the weight-reducing groove, namely the center line of the weight-reducing groove, and the center line of the weight-reducing groove also passes through the length midpoint of the second arc section of the weight-reducing groove;
The center O C1 of the first arc section of the weight-reducing groove is positioned on the center line of the weight-reducing groove, the center O C2 of the second arc section of the weight-reducing groove coincides with the center O of the rotor punching sheet, the center O of the rotor punching sheet is the center of the shaft hole, the distance from O C1 to the center O of the rotor punching sheet is d OC1, the radius of the second arc section of the weight-reducing groove is r OC2, and the radius of the rotor punching sheet is r, wherein the constraint relation exists: d OC1=0.58~0.62r,rOC2=0.45~0.5r,dOC1/rOC2 =1.16 to 1.37.
The invention also provides a permanent magnet synchronous rotor, which comprises the permanent magnet synchronous rotor punching sheet.
The invention also provides a permanent magnet synchronous motor which comprises the permanent magnet synchronous rotor.
The permanent magnet synchronous rotor punching sheet, the permanent magnet synchronous rotor and the permanent magnet synchronous motor provided by the invention have the following beneficial effects:
1. The invention discloses a weight reduction groove arranged between a magnetism isolating bridge and a shaft hole of a permanent magnet synchronous rotor punching sheet, and the weight reduction groove is formed by rounding the positions of three corners of the weight reduction groove on the basis of a triangular groove, wherein the weight reduction groove comprises a weight reduction groove first arc section formed by rounding one corner, and the weight reduction groove first arc section is opposite to the magnetism isolating bridge in the radial direction of the shaft hole, so that the weight of a rotor can be reduced under the condition that the stress release of a magnetic circuit and the magnetism isolating bridge is not influenced, the rotational inertia of the rotor is reduced, the stress is reduced, the strength of the rotor is improved, the distribution of magnetic force lines can be optimized, and the torque pulsation is further reduced; the included angle a between the first straight lines of the weight-reducing groove and the included angle b between the first straight lines of the weight-reducing groove and the midpoint tangent line of the arc section of the magnetic isolation bridge are set to meet constraint relation: a/b=0.78-1, and can prevent the stress concentration problem at the position of the magnetism isolating bridge caused by blocking the stress release at the position of the magnetism isolating bridge H by the weight reducing groove C while ensuring that the weight reducing groove is larger.
2. According to the invention, the included angle e between the center line L2 of the weight reduction groove and the center line L3 of the magnetic isolation bridge is set to be the rotor oblique polar angle divided by the number of the rotor segments, so that the weight reduction groove can be conveniently utilized for positioning during rotor oblique polar assembly, and the setting mode can be correspondingly adjusted according to the rotor oblique polar angle, so that the installation efficiency is improved.
3. According to the invention, the radius r c1 of the first arc section C1 of the weight reduction groove is set to be r c1 =2-4 mm, the radius r c3 of the third arc section is set to be r c3 =2-4 mm, so that the problem that the stress release at the position of the magnetic isolation bridge is blocked due to overlarge radius of two arcs can be effectively avoided, and meanwhile, the problem that the stress of the rotor is concentrated on the weight reduction groove due to overlarge radius of the two arcs can be avoided, and the stress diffusion at the position of the weight reduction groove is not facilitated. Effectively reduces stress and further improves the strength of the rotor.
4. The invention further discloses a distance d OC1 from the circle center O C1 of the first arc section C1 of the weight reduction groove to the circle center O of the rotor punching sheet, the circle center O C2 of the second arc section C2 of the weight reduction groove coincides with the circle center O of the rotor punching sheet, the radius of the second arc C2 is r OC2, and the radius of the rotor punching sheet is r, wherein the constraint relation exists: d OC1=0.58~0.62r,rOC2=0.45~0.5r,dOC1/rOC2 =1.16-1.37, and can further optimize magnetic force line distribution and stress distribution and reduce torque pulsation and rotor stress while ensuring electromagnetic performance.
Drawings
FIG. 1 is a schematic diagram of a permanent magnet synchronous rotor sheet of the present invention;
FIG. 2 is a schematic diagram of a permanent magnet synchronous rotor sheet according to the present invention;
FIG. 3a is a rotor stress simulation of a permanent magnet synchronous rotor lamination of the present invention (inventive point one);
FIG. 3b is a rotor stress simulation diagram (overall) of a permanent magnet synchronous rotor lamination of the present invention;
FIG. 3c is a rotor stress simulation diagram of a prior art permanent magnet synchronous rotor lamination;
FIG. 4a is a torque ripple simulation of a permanent magnet synchronous rotor lamination of the present invention (inventive point one);
FIG. 4b is a torque ripple simulation diagram (overall) of a permanent magnet synchronous rotor lamination of the present invention;
fig. 4c is a torque ripple simulation of a prior art permanent magnet synchronous rotor sheet.
The reference numerals are expressed as:
1. A shaft hole; A. rotor punching; B. a magnetic steel groove; C. a weight reduction groove; D. a large rivet hole; E. a small rivet hole; H. a magnetic isolation bridge;
C1, a first arc section of the weight reducing groove; c2, a second arc section of the weight reducing groove; c3, a third arc section of the weight reducing groove; c4, a first straight section of the weight-reducing groove; h1, a magnetic isolation bridge straight line segment; h2, magnetic bridge arc segment; l1, a midpoint tangent line of an arc section of the magnetic isolation bridge; l2, the center line of the weight reducing groove; l3, magnetically isolated bridge centerline; a. an included angle between the first straight lines of the weight reducing grooves; b. an included angle is formed between midpoint tangents of arc sections of the magnetic isolation bridge; e. center line and partition of weight-reducing groove an included angle is formed between the central lines of the magnetic bridges; o, the circle center of the rotor punching sheet; d OC1, the distance from the circle center of the first arc section of the weight-reducing groove to the circle center of the rotor punching sheet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
As shown in fig. 1 to 4c, the present invention provides a permanent magnet synchronous rotor sheet, which includes:
The magnetic steel groove B is provided with at least two magnetic steel grooves B, at least two magnetic steel grooves B are positioned on the radial outer side of the shaft hole 1, the magnetic isolation bridge H is arranged between two adjacent magnetic steel grooves B, the weight reduction groove C is formed by rounding the positions of three corners of the magnetic steel grooves B on the basis of a triangular groove, the weight reduction groove C comprises a weight reduction groove first arc section C1 formed by rounding one corner of the weight reduction groove first arc section C1, the weight reduction groove first arc section C1 is opposite to the magnetic isolation bridge H in the radial direction of the shaft hole 1 (as shown in figure 2, the weight reduction groove C is a triangular-like structural groove and comprises a straight edge, two straight edges and one arc edge which are all rounded at the three corners);
Two straight edges of the weight-reducing groove C, which are respectively connected with the first arc sections C1 of the weight-reducing groove, are two first straight sections C4 of the weight-reducing groove, and an included angle a is formed between extension lines of the first straight sections C4 of the weight-reducing groove, namely an included angle a between the first straight lines of the weight-reducing groove;
In the same magnetic pole, in two adjacent magnetic steel grooves B, the radial innermost side of one magnetic steel groove is provided with a first magnetic steel groove arc edge, the radial innermost side of the other magnetic steel groove is provided with a second magnetic steel groove arc edge, the first magnetic steel groove arc edge and the second magnetic steel groove arc edge are oppositely arranged to form two opposite arc sections of the magnetic isolation bridge H, namely a magnetic isolation bridge arc section H2, a tangential line is taken from the midpoint of the length of each magnetic isolation bridge arc section H2, namely a midpoint tangential line L1 of the magnetic isolation bridge arc section, and an included angle B is formed between the midpoint tangential lines L1 of the two magnetic isolation bridge arc sections, namely an included angle B between the midpoint tangential lines of the magnetic isolation bridge arc sections;
and there is a constraint relationship: a/b=0.78 to 1.
The invention discloses a weight reduction groove arranged between a magnetism isolating bridge and a shaft hole of a permanent magnet synchronous rotor punching sheet, and the weight reduction groove is formed by rounding the positions of three corners of the weight reduction groove on the basis of a triangular groove, wherein the weight reduction groove comprises a weight reduction groove first arc section formed by rounding one corner, and the weight reduction groove first arc section is opposite to the magnetism isolating bridge in the radial direction of the shaft hole, so that the weight of a rotor can be reduced under the condition that the stress release of a magnetic circuit and the magnetism isolating bridge is not influenced, the rotational inertia of the rotor is reduced, the stress is reduced, the strength of the rotor is improved, the distribution of magnetic force lines can be optimized, and the torque pulsation is further reduced;
The invention sets the included angle a between the first straight lines of the weight-reducing groove and the included angle b between the included angle a and the midpoint tangent of the arc section of the magnetic isolation bridge as meeting the constraint relation: a/b=0.78-1, can guarantee to subtract heavy groove great simultaneously, can also prevent to subtract heavy groove C and block magnetism isolating bridge H department stress release, cause magnetism isolating bridge department stress concentration problem, consequently can reduce stress, improve rotor structural strength, can also guarantee simultaneously that the area that subtracts heavy groove can not reduce, reduce the cost.
Based on the preferred V-shaped rotor topological structure (which can be also applied to other types of rotors, wherein the V-shaped (or other types) refers to a structure formed by magnetic steel grooves on one pole, the number of poles of the rotor is preferably 8, and each pole is formed by two magnetic steel grooves to form the V-shaped structure), the invention provides a method for improving the strength of the rotor and reducing the quality of the rotor under the condition of ensuring the electromagnetic performance, and the aims of improving the strength of the rotor, reducing the quality of the rotor and reducing the torque pulsation are achieved through the matching optimization of a magnetism isolating bridge and a weight reducing groove.
Fig. 1 shows a rotor punching sheet according to the present invention, wherein a rotor punching sheet a includes a magnetic steel groove B, a weight reduction groove C, a large rivet hole D, and a small rivet hole E. The magnetic steel grooves, the weight-reducing grooves and the rivet holes are preferably distributed uniformly and at intervals in the circumferential direction of the rotor punching sheet.
An intermediate magnetism isolating bridge H is formed between the proximal shaft hole ends of the two magnetic steel grooves B, and as shown in fig. 2, the magnetism isolating bridge H consists of a magnetism isolating bridge straight line segment H1 and a magnetism isolating bridge arc segment H2. The weight reduction groove C is positioned at the position of the near-axis hole 1 below the magnetism isolating bridge, and is approximately triangular, so that the weight of the rotor can be reduced under the condition that the stress release of the magnetic circuit and the magnetism isolating bridge is not affected, and the moment of inertia of the rotor is reduced.
The invention has the following beneficial effects:
1. By adding the weight increasing and decreasing grooves in the region, close to the rotating shaft, of the rotor core, the electromagnetic performance is ensured, meanwhile, the rotor quality is reduced, and the stress distribution is optimized.
2. Through optimizing the matching of the weight reduction groove and the magnetism isolating bridge, the stress of the magnetism isolating bridge is reduced, the distribution of magnetic force lines of a rotor is improved, and the torque pulsation is reduced.
As shown in fig. 3a, 3c and 4a and 4c, the invention aims at the problems of insufficient strength of a rotor punching sheet, large mass of a rotor core, high torque pulsation and the like of a driving motor at high rotating speed, increases a weight reducing groove on the rotor core in a region close to a rotating shaft, reduces the mass of the rotor while ensuring electromagnetic performance, and optimizes stress distribution. Through optimizing the matching of the weight reduction groove and the magnetism isolating bridge, the stress of the magnetism isolating bridge is reduced, the distribution of magnetic force lines of a rotor is improved, and the torque pulsation is reduced. The final beneficial effects are as follows: the maximum stress of the rotor is reduced from 323MPa (figure 3 c) to 301MPa (figure 3 a) while the electromagnetic performance is ensured, and the maximum stress is reduced by 6%; the torque ripple was reduced from 4.9% (fig. 4 c) to 4.1% (fig. 4 a), by 16%.
In some embodiments of the present invention, in some embodiments,
The weight-reducing groove C further comprises two weight-reducing groove third arc sections C3 formed by rounding at the other two corners of the triangular groove, the two weight-reducing groove third arc sections C3 are connected through a weight-reducing groove second arc section C2, and the weight-reducing groove second arc sections C2 are opposite to the shaft hole 1 in the radial direction of the shaft hole.
The weight reducing groove C is preferably composed of a weight reducing groove first arc section C1, a weight reducing groove second arc section C2, 2 weight reducing groove third arc sections C3 and two weight reducing groove first straight sections C4, which are further preferred structural forms of the invention, the weight reducing groove second arc sections are formed by rounding at other two corners and are connected between the two weight reducing groove third arc sections, and the weight reducing groove second arc sections are opposite to the shaft hole in the radial direction, so that the electromagnetic performance can be further ensured, the rotor quality can be reduced, the stress distribution can be optimized, the rotor magnetic force line distribution can be improved, and the torque pulsation can be reduced.
In some embodiments of the present invention, in some embodiments,
The rounding of the weight-reducing groove C is an inscribed circle tangent to two adjacent sides of the weight-reducing groove C, the second arc section C2 of the weight-reducing groove is an arc section which is made by taking two endpoints of opposite straight edges of the triangular structure and the shaft hole 1 as endpoints, and the center of the second arc section C2 of the weight-reducing groove is coincident with the center of the shaft hole 1.
The weight reducing groove is a further preferable structural form, namely the second arc section of the weight reducing groove takes two opposite end points (namely two end points of a straight edge of a virtual triangle structure opposite to a shaft hole) of the third arc section of the weight reducing groove as end points, one end arc section is made, the circle center of the arc section coincides with the center of the shaft hole (namely the circle center O of a rotor punching sheet), the electromagnetic performance can be further ensured, the rotor quality can be reduced, the stress distribution can be optimized, the rotor magnetic force line distribution can be improved, and the torque pulsation can be reduced.
In some embodiments of the present invention, in some embodiments,
In the same magnetic pole, in two adjacent magnetic steel grooves B, a first magnetic steel groove straight edge is connected with the first magnetic steel groove arc edge, a second magnetic steel groove straight edge is connected with the second magnetic steel groove arc edge, the first magnetic steel groove straight edge and the second magnetic steel groove straight edge are oppositely arranged, and a straight section of the magnetic isolation bridge H, namely a magnetic isolation bridge straight section H1, is formed between the first magnetic steel groove straight edge and the second magnetic steel groove straight edge.
In some embodiments of the present invention, in some embodiments,
The center line of the weight-reducing groove C is a connecting line between the center of the shaft hole 1 and the length midpoint of the first arc section C1 of the weight-reducing groove, namely a center line L2 of the weight-reducing groove, and the center line L2 of the weight-reducing groove also passes through the length midpoint of the second arc section C2 of the weight-reducing groove;
the central line of the magnetic isolation bridge H is a bisector of the width of the magnetic isolation bridge H along the circumferential direction, namely a magnetic isolation bridge central line L3, and the magnetic isolation bridge central line L3 passes through the center of the shaft hole 1;
An included angle e is formed between the center line L2 of the weight-reducing groove and the center line L3 of the magnetic isolation bridge, namely, an included angle e is formed between the center line of the weight-reducing groove and the center line of the magnetic isolation bridge, and the included angle e is the oblique polar angle alpha of the rotor divided by the number of sections of the rotor (the oblique polar of the motor rotor of the invention means that the motor rotor is inclined by a certain angle along the circumferential direction so that the magnetic pole of the rotor is not completely vertical to the magnetic pole of the stator any more; the invention is characterized in that a plurality of superposed rotor punching sheets are axially divided into a plurality of sections, and the circumferential rotation angles exist between the sections, namely, the oblique polar angle of the rotor).
According to the invention, the included angle e between the center line L2 of the weight reduction groove and the center line L3 of the magnetic isolation bridge is set to be the rotor oblique polar angle divided by the number of the rotor segments, so that the weight reduction groove can be conveniently utilized for positioning during rotor oblique polar assembly, and the setting mode can be correspondingly adjusted according to the rotor oblique polar angle, so that the installation efficiency is improved.
In some embodiments of the present invention, in some embodiments,
The number of the rotor punching pieces in the rotor axial direction is two, and the rotor inclined pole angle alpha=3.75 degrees and e=1.875 degrees.
The rotor reduces torque pulsation and harmonic content, preferably adopts a mode of oblique polar angle of 3.75 degrees and is divided into two sections, the included angle e between the central line L2 of the weight reduction groove and the central line L3 of the magnetism isolating bridge is 1.875 degrees, and is half of the oblique polar angle of the rotor, the arrangement mode can be conveniently used for positioning when the oblique polar of the rotor is formed by assembling, and the arrangement mode can be correspondingly adjusted according to the oblique polar angle of the rotor.
In some embodiments of the present invention, in some embodiments,
The radius of the first arc section C1 of the weight-reducing groove is r c1, and the radius of the third arc section C3 of the weight-reducing groove is r c3,rc1=2~4mm,rc3 =2-4 mm.
According to the invention, the radius r c1 of the first arc section C1 of the weight reduction groove is set to be r c1 =2-4 mm, the radius r c3 of the third arc section is set to be r c3 =2-4 mm, so that the problem that the stress release at the position of the magnetic isolation bridge is blocked due to overlarge radius of two arcs can be effectively avoided, and meanwhile, the problem that the stress of the rotor is concentrated on the weight reduction groove due to overlarge radius of the two arcs can be avoided, and the stress diffusion at the position of the weight reduction groove is not facilitated. Effectively reduces stress and further improves the strength of the rotor.
In some embodiments of the present invention, in some embodiments,
The center line of the weight-reducing groove C is a connecting line between the center of the shaft hole 1 and the length midpoint of the first arc section C1 of the weight-reducing groove, namely a center line L2 of the weight-reducing groove, and the center line L2 of the weight-reducing groove also passes through the length midpoint of the second arc section C2 of the weight-reducing groove;
The center O C1 of the first arc section C1 of the weight-reducing groove is positioned on the center line L2 of the weight-reducing groove, the center O C2 of the second arc section C2 of the weight-reducing groove coincides with the center O of the rotor punching sheet, the center O of the rotor punching sheet is the center of the shaft hole 1, the distance from O C1 to the center O of the rotor punching sheet is d OC1, the radius of the second arc section C2 of the weight-reducing groove is r OC2, the radius of the rotor punching sheet is r, and constraint relation exists: d OC1=0.58~0.62r,rOC2=0.45~0.5r,dOC1/rOC2 =1.16 to 1.37.
The invention further discloses a method for manufacturing the rotor sheet, which comprises the following steps that through the distance d OC1 from the circle center O C1 of a first arc section C1 of the weight reduction groove to the circle center O of the rotor sheet, the circle center O C2 of a second arc section C2 of the weight reduction groove coincides with the circle center O of the rotor sheet, the radius of the second arc section C2 of the weight reduction groove is r OC2, and the radius of the rotor sheet is r, wherein the constraint relation exists: d OC1=0.58~0.62r,rOC2=0.45~0.5r,dOC1/rOC2 =1.16-1.37, and can further optimize magnetic force line distribution and stress distribution and reduce torque pulsation and rotor stress while ensuring electromagnetic performance.
In the invention, the circle center O C1 of the first arc section C1 of the weight-reducing groove is preferably positioned on the center line L2 of the weight-reducing groove, the circle center O C2 of the second arc section C2 of the weight-reducing groove coincides with the circle center O of the rotor punching sheet, the distance from O C1 to the circle center O of the rotor punching sheet is d OC1, the radius of the second arc section C2 of the weight-reducing groove is r OC2, and the radius of the rotor punching sheet is r, so that the constraint relation is satisfied: d OC1=0.58~0.62r,rOC2=0.45~0.5r,dOC1/rOC2 =1.16-1.37, so that the weight reduction groove is positioned on the paraxial side, the distribution of magnetic force lines and the stress distribution are optimized while the electromagnetic performance is ensured, and the torque pulsation and the rotor stress are reduced.
According to the design, the final effect of the invention is compared as follows: fig. 3b-3c are graphs comparing the stress of the rotor punching sheet (overall effect) of the present invention with that of a conventional weight-reducing slot rotor punching sheet (simulation result of the eighth model strength of the rotor in the figure), the maximum stress of the rotor of the present invention is 255MPa (see fig. 3 b), and the maximum stress of the conventional weight-reducing slot rotor punching sheet is 323MPa (see fig. 3 c), so that the stress is reduced by 21%. Fig. 4b-4c are torque ripple plots for a rotor lamination motor of the present invention (see fig. 4b, overall effect) versus a conventional reduced-weight slot rotor lamination motor (see fig. 4 c), with the rotor lamination motor of the present invention, torque ripple is reduced from 4.9% (fig. 4 c) to 2.3% (fig. 4 b), by 52%.
The invention also provides a permanent magnet synchronous rotor, which comprises the permanent magnet synchronous rotor punching sheet.
Aiming at the problems of insufficient strength of a rotor punching sheet, large mass of a rotor core, high torque pulsation and the like of a driving motor at a high rotating speed, the invention adds the weight reducing groove on the rotor core in the area close to the rotating shaft, reduces the mass of the rotor while ensuring the electromagnetic performance, and optimizes the stress distribution. Through optimizing the matching of the weight reduction groove and the magnetism isolating bridge, the stress of the magnetism isolating bridge is reduced, the distribution of magnetic force lines of a rotor is improved, and the torque pulsation is reduced. The final beneficial effects are as follows: the maximum stress of the rotor is reduced from 323MPa (figure 3 c) to 255MPa (figure 3 b) while the electromagnetic performance is ensured, and 21% is reduced; the torque ripple is reduced by 52%.
The invention also provides a permanent magnet synchronous motor which comprises the permanent magnet synchronous rotor.
Specific examples:
An intermediate magnetism isolating bridge H is formed between the proximal shaft hole ends of the two magnetic steel grooves B, and as shown in figure 2, the magnetism isolating bridge H consists of a magnetism isolating bridge straight line segment H1 and a magnetism isolating bridge arc segment H2. The weight reduction groove C is positioned at the position of the near shaft hole below the magnetism isolating bridge, and is in a triangle-like shape, so that the weight of the rotor can be reduced under the condition that the stress release of the magnetic circuit and the magnetism isolating bridge is not influenced, and the rotational inertia of the rotor is reduced. The weight-reducing groove C consists of a weight-reducing groove first arc section C1, a weight-reducing groove second arc section C2, a weight-reducing groove third arc section C3 and a weight-reducing groove first straight section C4. The included angle between the first straight sections C4 of the two weight-reducing grooves is a, the included angle between the midpoint tangent lines L1 of the arc sections H2 of the two magnetism isolating bridges is b, and the constraint relation exists: the constraint relation can prevent the stress at the position of the magnetic isolation bridge H from being released by the weight reduction groove C to cause the problem of stress concentration at the position of the magnetic isolation bridge while ensuring that the weight reduction groove is large, and a/b=0.78-1. In order to reduce torque pulsation and harmonic content, the rotor preferably adopts a diagonal pole 3.75 degrees, and is divided into two sections, the included angle e between the central line L2 of the weight reduction groove and the central line L3 of the magnetism isolating bridge is 1.875 degrees, and is half of the diagonal pole angle of the rotor.
According to the invention, the radius of the first arc section C1 of the weight-reducing groove is r c1, the radius of the third arc section C3 of the weight-reducing groove is r c3,rc1=2~4,rc3 =2-4, the excessive radiuses of the two arcs can prevent the stress release at the position of the magnetism-isolating bridge, and the too small radius can cause the stress of the rotor to be concentrated on the weight-reducing groove, so that the stress diffusion at the position of the weight-reducing groove is not facilitated. The circle center O C1 of the first arc section C1 of the weight-reducing groove is positioned on the center line L2 of the weight-reducing groove, the circle center O C2 of the second arc section C2 of the weight-reducing groove coincides with the circle center O of the rotor punching sheet, the distance from O C1 to the circle center O of the rotor punching sheet is d OC1, the radius of the second arc section C2 of the weight-reducing groove is r OC2, and the radius of the rotor punching sheet is r, wherein the constraint relation exists: d OC1=0.58~0.62r,rOC2=0.45~0.5r,dOC1/rOC2 =1.16 to 1.37. The constraint relation enables the weight reduction groove to be located on the paraxial side, and the distribution of magnetic force lines and the stress distribution are optimized while the electromagnetic performance is ensured, so that the torque pulsation and the rotor stress are reduced.
According to the invention, through the matching optimization of the weight reduction groove and the magnetism isolating bridge, the stress of the magnetism isolating bridge can be reduced, the distribution of magnetic force lines of a rotor can be improved, and the torque pulsation can be reduced. The whole beneficial effects are as follows: the maximum stress of the rotor is reduced from 323MPa (figure 3 c) to 255MPa (figure 3 b) while the electromagnetic performance is ensured, and 21% is reduced; the torque ripple was reduced from 4.9% (fig. 4 c) to 2.3% (fig. 4 b), by 52%.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (10)
1. A permanent magnet synchronous rotor punching sheet is characterized in that: comprising the following steps:
The magnetic steel groove (B) is positioned at the radial outer side of the shaft hole (1), the magnetic isolation bridge (H) is arranged between every two adjacent magnetic steel grooves (B), the weight reduction groove (C) is formed by rounding the positions of three corners of the magnetic steel grooves on the basis of the triangular grooves, the weight reduction groove (C) comprises a weight reduction groove first arc section (C1) formed by rounding one corner, and the weight reduction groove first arc section (C1) is opposite to the magnetic isolation bridge (H) in the radial direction of the shaft hole (1);
Two straight edges of the weight-reducing groove (C) respectively connected with the first arc sections (C1) of the weight-reducing groove are two first straight sections (C4) of the weight-reducing groove, and an included angle a is formed between extension lines of the two first straight sections (C4) of the weight-reducing groove, namely an included angle (a) between the first straight lines of the weight-reducing groove;
In the same magnetic pole, in two adjacent magnetic steel grooves (B), the radial innermost side of one magnetic steel groove is provided with a first magnetic steel groove arc edge, the radial innermost side of the other magnetic steel groove is provided with a second magnetic steel groove arc edge, the first magnetic steel groove arc edge and the second magnetic steel groove arc edge are oppositely arranged to form two opposite arc sections of the magnetic isolation bridge (H), namely magnetic isolation bridge arc sections (H2), the midpoint of the length of each magnetic isolation bridge arc section (H2) is taken as a tangent line, namely a midpoint tangent line (L1) of the magnetic isolation bridge arc section, and an included angle B is formed between the midpoint tangent lines (L1) of the two magnetic isolation bridge arc sections, namely an included angle (B) between midpoint tangent lines of the magnetic isolation bridge arc sections;
and there is a constraint relationship: a/b=0.78 to 1.
2. The permanent magnet synchronous rotor punching according to claim 1, characterized in that:
The weight-reducing groove (C) further comprises two weight-reducing groove third arc sections (C3) formed by rounding at the other two corners of the triangular groove, the two weight-reducing groove third arc sections (C3) are connected through a weight-reducing groove second arc section (C2), and the weight-reducing groove second arc sections (C2) are opposite to the shaft hole (1) in the radial direction of the shaft hole (1).
3. The permanent magnet synchronous rotor punching according to claim 2, characterized in that:
The rounding of the weight-reducing groove (C) is an inscribed circle tangent to two adjacent sides of the weight-reducing groove, the second arc section (C2) of the weight-reducing groove is an arc section which is made by taking two endpoints of opposite straight sides of the triangular groove and the shaft hole (1) as endpoints, and the center of the second arc section (C2) of the weight-reducing groove coincides with the center of the shaft hole (1).
4. The permanent magnet synchronous rotor punching according to claim 1, characterized in that:
In the same magnetic pole, in two adjacent magnetic steel grooves (B), a first magnetic steel groove straight edge is connected with a first magnetic steel groove arc edge, a second magnetic steel groove straight edge is connected with a second magnetic steel groove arc edge, the first magnetic steel groove straight edge and the second magnetic steel groove straight edge are oppositely arranged, and a straight section of a magnetism isolating bridge (H), namely a magnetism isolating bridge straight section (H1), is formed between the first magnetic steel groove straight edge and the second magnetic steel groove straight edge.
5. The permanent magnet synchronous rotor punching according to claim 2, characterized in that:
The center line of the weight-reducing groove (C) is a connecting line between the center of the shaft hole (1) and the length midpoint of the first arc section (C1) of the weight-reducing groove, namely a weight-reducing groove center line (L2), and the weight-reducing groove center line (L2) also passes through the length midpoint of the second arc section (C2) of the weight-reducing groove;
The central line of the magnetic isolation bridge (H) is a bisector of the width of the magnetic isolation bridge (H) along the circumferential direction, namely a magnetic isolation bridge central line (L3), and the magnetic isolation bridge central line (L3) passes through the center of the shaft hole (1);
An included angle e is formed between the center line (L2) of the weight-reducing groove and the center line (L3) of the magnetic isolation bridge, namely an included angle (e) between the center line of the weight-reducing groove and the center line of the magnetic isolation bridge, and the included angle e is the rotor oblique polar angle alpha divided by the number of sections of the rotor.
6. The permanent magnet synchronous rotor punching according to claim 5, characterized in that:
The number of the rotor punching pieces in the rotor axial direction is two, and the rotor inclined pole angle alpha=3.75 degrees and e=1.875 degrees.
7. The permanent magnet synchronous rotor punching according to claim 2, characterized in that:
The radius of the first arc section (C1) of the weight-reducing groove is r c1, and the radius of the third arc section (C3) of the weight-reducing groove is r c3,rc1=2~4mm,rc3 =2-4 mm.
8. The permanent magnet synchronous rotor punching according to claim 2, characterized in that:
The center line of the weight-reducing groove (C) is a connecting line between the center of the shaft hole (1) and the length midpoint of the first arc section (C1) of the weight-reducing groove, namely a weight-reducing groove center line (L2), and the weight-reducing groove center line (L2) also passes through the length midpoint of the second arc section (C2) of the weight-reducing groove;
The center O C1 of the first arc section (C1) of the weight-reducing groove is positioned on the center line (L2) of the weight-reducing groove, the center O C2 of the second arc section (C2) of the weight-reducing groove coincides with the center O of the rotor punching sheet, the center O of the rotor punching sheet is the center of the shaft hole (1), the distance from O C1 to the center O of the rotor punching sheet is d OC1, the radius of the second arc section (C2) of the weight-reducing groove is r OC2, and the radius of the rotor punching sheet is r, wherein the constraint relation exists: d OC1=0.58~0.62r,rOC2=0.45~0.5r,dOC1/rOC2 =1.16 to 1.37.
9. A permanent magnet synchronous rotor, characterized in that: comprising a permanent magnet synchronous rotor sheet according to any one of claims 1-8.
10. A permanent magnet synchronous motor, characterized in that: comprising the permanent magnet synchronous rotor of claim 9.
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| CN202410897606.3A CN118432392B (en) | 2024-07-05 | 2024-07-05 | Permanent magnet synchronous rotor punching sheet, permanent magnet synchronous rotor and permanent magnet synchronous motor |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000287419A (en) * | 1999-03-30 | 2000-10-13 | Fujitsu General Ltd | Reluctance motor |
| CN219875236U (en) * | 2023-03-30 | 2023-10-20 | 武汉理工通宇新源动力有限公司 | High-speed high-power-density permanent magnet motor rotor punching structure |
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| CN116247841A (en) * | 2021-12-08 | 2023-06-09 | 安徽威灵汽车部件有限公司 | Rotor punching sheet, rotor, motor, electric power steering system and vehicle |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000287419A (en) * | 1999-03-30 | 2000-10-13 | Fujitsu General Ltd | Reluctance motor |
| CN219875236U (en) * | 2023-03-30 | 2023-10-20 | 武汉理工通宇新源动力有限公司 | High-speed high-power-density permanent magnet motor rotor punching structure |
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