CN220775484U

CN220775484U - Permanent magnet auxiliary synchronous reluctance motor rotor structure and permanent magnet auxiliary synchronous reluctance motor

Info

Publication number: CN220775484U
Application number: CN202322472592.4U
Authority: CN
Inventors: 陈彬; 黄浩涛; 汪汉新; 贾金信; 刘淼; 杨小娟
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2023-09-12
Filing date: 2023-09-12
Publication date: 2024-04-12
Anticipated expiration: 2033-09-12

Abstract

The utility model provides a rotor structure of a permanent magnet auxiliary synchronous reluctance motor and the permanent magnet auxiliary synchronous reluctance motor, which comprise a rotor core, wherein a central line extends outwards along the radial direction from the center of the rotor core and intersects with the radial periphery of the rotor core at a point M, and at least two air grooves are formed in the rotor core; the width of the air groove along the circumferential direction is B, the width of the first magnetism isolating bridge is w1, and the constraint relation exists: b= (3.5-3.7) ×10ζ8/(w 1×nmax 2), the ratio MN/mp=0.5-0.52 of the distance of MN to the distance of MP. According to the utility model, the electromagnetic performance is effectively ensured while the larger centrifugal force generated during high-speed rotation is reduced, and the problem that the mechanical strength of the rotor is lower due to larger stress applied to the magnetism isolating bridge caused by larger centrifugal force applied to the rotor core of the permanent magnet auxiliary synchronous reluctance motor during high-speed rotation is solved.

Description

Permanent magnet auxiliary synchronous reluctance motor rotor structure and permanent magnet auxiliary synchronous reluctance motor

Technical Field

The utility model relates to the technical field of motors, in particular to a permanent magnet auxiliary synchronous reluctance motor rotor structure and a permanent magnet auxiliary synchronous reluctance motor.

Background

With the increasing importance of people on environmental protection and efficient energy utilization, the new and four-purpose of automobiles becomes industry consensus, and the surge of automobile electric power is also more and more expanded. For new energy automobiles, battery technology, motor technology and motor controller technology are called as key three-electricity technology of the new energy automobiles. On the premise that the current battery technology fails to break through, the improvement of the efficiency, the power density, the safety and the reliability of the motor driving system becomes a main research direction of the motor driving system of the new energy automobile.

The permanent magnet auxiliary synchronous reluctance motor is widely applied to the field of pure electric or hybrid new energy automobiles because of the advantages of high torque density, high efficiency, good steady state performance, high reliability and the like.

With the rising price of rare earth raw materials, the cost pressure of the rare earth motor is higher, the minimum cost is required to output the maximum torque to meet the whole vehicle performance, and the cost performance of the motor is improved. Therefore, the research and development of the permanent magnet auxiliary synchronous reluctance motor with relatively low cost is of great significance. The rotor of the permanent magnet auxiliary synchronous reluctance motor usually adopts a multi-layer magnetic barrier structure to obtain higher reluctance torque, and a magnetic barrier bridge is added to maintain the mechanical strength of the motor during operation. However, since the width of the magnetically permeable bridge is generally small, the mechanical strength of the rotor is one of the difficulties in design and manufacture. When the motor runs at a high speed, the effect of centrifugal force is particularly outstanding and is far greater than the influence of other acting forces, the centrifugal force is proportional to the square of the rotating speed, and as the rotating speed is increased, the centrifugal force is greatly increased, so that the problem that the rotor is damaged due to overlarge stress of a magnetic isolation bridge is easily caused.

The rotor core of the permanent magnet auxiliary synchronous reluctance motor in the prior art receives larger centrifugal force when rotating at a high speed, so that the stress received by the magnetism isolating bridge is larger, and the mechanical strength of the rotor is low, and the like.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to overcome the defect that the rotor core of the permanent magnet auxiliary synchronous reluctance motor in the prior art receives larger centrifugal force when rotating at high speed, so that the stress received by the magnetism isolating bridge is larger, and the mechanical strength of the rotor is lower, thereby providing a rotor structure of the permanent magnet auxiliary synchronous reluctance motor and the permanent magnet auxiliary synchronous reluctance motor.

In order to solve the above problems, the present utility model provides a rotor structure of a permanent magnet auxiliary synchronous reluctance motor, comprising:

the rotor iron core is provided with a plurality of magnetic poles, is positioned in an axial projection plane in any magnetic pole, is provided with a central line, extends outwards in the radial direction from the center of the rotor iron core and is intersected with the radial periphery of the rotor iron core at a point M, is provided with at least two air grooves, including a first air groove and a second air groove, and is symmetrically arranged relative to the central line, is provided with at least two magnetic steel grooves, including a first magnetic steel groove closest to the first air groove and a second magnetic steel groove closest to the second air groove, and is symmetrically arranged relative to the central line;

The width of the air groove along the circumferential direction is B, a first magnetism isolating bridge is arranged between a cavity on the radial inner side of the first magnetic steel groove and a cavity on the radial inner side of the second magnetic steel groove, the width of the first magnetism isolating bridge is w1, and the restraint relationship exists: b= (3.5-3.7) ×10ζ8/(w 1×nmax ζ2), wherein nmax is the motor design highest rotation speed, an intersection point of a connecting line between an end of the first air groove closest to the center line and an end of the second air groove closest to the center line and the center line is N, a radially outer end of the first magnetic separation bridge Q1 and the center line intersect at P, wherein a ratio MN/mp=0.5-0.52 of a distance of MN to a distance of MP.

In some embodiments of the present invention, in some embodiments,

B＝4.5/w1，w1＝1.5-2mm。

in some embodiments of the present invention, in some embodiments,

w1＝1.8mm，nmax＝9000rpm，MN/MP＝0.515。

in some embodiments of the present invention, in some embodiments,

the first air groove and the first magnetic steel groove are positioned on the same side in the circumferential direction of the central line, the shortest distance between the first air groove and the first magnetic steel groove along the circumferential direction is x, the value range of x is 3-3.3mm, the side, facing the central line, of the first air groove is a first side of the first air groove, the side, facing the central line, of the second air groove is a first side of the second air groove, the included angle between the first side of the first air groove and the first side of the second air groove is Ak, and the value range of Ak is: ak=360 deg/pole±2deg, pole is the number of poles, and deg is the degree of angle.

In some embodiments of the present invention, in some embodiments,

x=3.14 mm; ak=360 deg/pole, pole 8.

In some embodiments of the present invention, in some embodiments,

the magnetic steel grooves further comprise third magnetic steel grooves which are positioned on one side of the first magnetic steel groove, which is far away from the circumference of the center line, and fourth magnetic steel grooves which are positioned on one side of the second magnetic steel groove, which is far away from the circumference of the center line, and fifth magnetic steel grooves which are positioned on the radial inner sides of the first magnetic steel grooves and the second magnetic steel grooves, wherein the third magnetic steel grooves and the fourth magnetic steel grooves are also symmetrically arranged relative to the center line, and the fifth magnetic steel grooves are also symmetrically arranged relative to the center line.

In some embodiments of the present invention, in some embodiments,

a second magnetic isolation bridge is arranged between the cavity at the radial inner side of the third magnetic steel groove and the fifth magnetic steel groove closest to the third magnetic steel groove, and a third magnetic isolation bridge is arranged between the cavity at the radial inner side of the fourth magnetic steel groove and the fifth magnetic steel groove closest to the fourth magnetic steel groove; the widths of the second magnetic isolation bridge and the third magnetic isolation bridge are w2;

and there is a constraint relationship: w2-w1=0.2-0.4 mm.

In some embodiments of the present invention, in some embodiments,

in the projection plane of the axial end face of the rotor core: the first magnetic isolation bridge is of a rectangular structure, the side, located on the outer side in the radial direction, of the first magnetic isolation bridge intersects with the central line at a point Q1a, and the side, located on the inner side in the radial direction, of the first magnetic isolation bridge intersects with the central line at a point Q1b;

The second magnetic isolation bridge is of a rectangular structure, the midpoint of the length of the side, closest to the center line, of the second magnetic isolation bridge is Q2a, and the midpoint of the length, farthest from the center line, of the side of the second magnetic isolation bridge is Q2b;

the third magnetic isolation bridge is of a rectangular structure, the midpoint of the length of the side, closest to the center line, of the third magnetic isolation bridge is Q3a, and the midpoint of the length of the side, farthest from the center line, of the third magnetic isolation bridge is Q3b; the included angle between the connecting line of Q1a and Q2b and the connecting line of Q1a and Q3b is A1, and the included angle between the connecting line of Q1b and Q2a and the connecting line of Q1b and Q3a is A2; the included angle between the width central line of the second magnetic isolation bridge and the width central line of the third magnetic isolation bridge is Aq, and A1, A2 and Aq have a constraint relation:

A1<Aq<A2。

in some embodiments of the present invention, in some embodiments,

the first magnetic steel groove comprises a first magnetic steel groove first edge, a first magnetic steel groove second edge and a first magnetic steel groove third edge, the first magnetic steel groove first edge faces the central line, the first magnetic steel groove second edge is located on the radial inner side of the first magnetic steel groove first edge and opposite to the second magnetic steel groove, and the first magnetic steel groove third edge is located on the radial inner side of the first magnetic steel groove first edge and opposite to the fifth magnetic steel groove; the second magnetic steel groove comprises a second magnetic steel groove first edge, a second magnetic steel groove second edge and a second magnetic steel groove third edge, the second magnetic steel groove first edge faces the central line, the second magnetic steel groove second edge is positioned on the radial inner side of the second magnetic steel groove first edge and opposite to the first magnetic steel groove, and the second magnetic steel groove third edge is positioned on the radial inner side of the second magnetic steel groove first edge and opposite to the fifth magnetic steel groove;

The third magnetic steel groove comprises a third magnetic steel groove first edge, a third magnetic steel groove second edge and a third magnetic steel groove third edge, the third magnetic steel groove first edge faces the first magnetic steel groove, the third magnetic steel groove second edge is located on the radial inner side of the third magnetic steel groove first edge and opposite to the fifth magnetic steel groove, and the third magnetic steel groove third edge is opposite to the third magnetic steel groove first edge; the fourth magnetic steel groove comprises a fourth magnetic steel groove first edge, a fourth magnetic steel groove second edge and a fourth magnetic steel groove third edge, the fourth magnetic steel groove first edge faces the second magnetic steel groove, the fourth magnetic steel groove second edge is located on the radial inner side of the fourth magnetic steel groove first edge and opposite to the fifth magnetic steel groove, and the fourth magnetic steel groove third edge is opposite to the fourth magnetic steel groove first edge;

the fifth magnetic steel groove comprises a fifth magnetic steel groove first edge which is positioned at the radial outer end and is intersected with the central line, a fifth magnetic steel groove second edge which is opposite to the third magnetic steel groove second edge, a fifth magnetic steel groove third edge which is opposite to the fourth magnetic steel groove second edge, and a fifth magnetic steel groove fourth edge which is positioned at the radial inner side and is intersected with the central line;

The first side of the first magnetic steel groove is connected with the second side of the first magnetic steel groove, and the first side of the second magnetic steel groove is connected with the second side of the second magnetic steel groove; the second side of the first magnetic steel groove is connected with the third side of the first magnetic steel groove through an arc line, and the second side of the second magnetic steel groove is connected with the third side of the second magnetic steel groove through an arc line;

the first side of the third magnetic steel groove is connected with the second side of the third magnetic steel groove through an arc section, and the first side of the fifth magnetic steel groove is connected with the second side of the fifth magnetic steel groove through an arc section; the third side of the third magnetic steel groove is connected with the second side of the third magnetic steel groove through an arc line, and the second side of the fifth magnetic steel groove is connected with the fourth side of the fifth magnetic steel groove through an arc line;

the first side of the fourth magnetic steel groove is connected with the second side of the fourth magnetic steel groove through an arc line, and the first side of the fifth magnetic steel groove is connected with the third side of the fifth magnetic steel groove through an arc line; the third side of the fourth magnetic steel groove is connected with the second side of the fourth magnetic steel groove through an arc line, and the third side of the fifth magnetic steel groove is connected with the fourth side of the fifth magnetic steel groove through an arc line.

In some embodiments of the present invention, in some embodiments,

The intersection between the central line and the connecting line between the intersection point of the first magnetic steel groove first edge and the first magnetic steel groove second edge and the intersection point of the second magnetic steel groove first edge and the second magnetic steel groove second edge is in Q1a;

the intersection point of the extension line of the second side of the first magnetic steel groove and the extension line of the third side of the first magnetic steel groove and the intersection point of the extension line of the second side of the second magnetic steel groove and the extension line of the third side of the second magnetic steel groove are intersected with the central line at the Q1b;

the intersection point of the extension line of the first side of the third magnetic steel groove and the extension line of the second side of the third magnetic steel groove and the intersection point of the extension line of the first side of the fifth magnetic steel groove and the extension line of the second side of the fifth magnetic steel groove and the width central line of the second magnetism isolating bridge are intersected at Q2a; the intersection point of the extension line of the third side of the third magnetic steel groove and the extension line of the second side of the third magnetic steel groove and the intersection point of the extension line of the second side of the fifth magnetic steel groove and the extension line of the fourth side of the fifth magnetic steel groove and the width central line of the second magnetism isolating bridge are intersected at the Q2b;

the intersection point of the extension line of the first side of the fourth magnetic steel groove and the extension line of the second side of the fourth magnetic steel groove and the intersection point of the extension line of the first side of the fifth magnetic steel groove and the extension line of the third side of the fifth magnetic steel groove and the width central line of the third magnetism isolating bridge are intersected at Q3a; and a connecting line between an extension line of the third side of the fourth magnetic steel groove and an extension line of the second side of the fourth magnetic steel groove and an intersection line between an extension line of the third side of the fifth magnetic steel groove and an extension line of the fourth side of the fifth magnetic steel groove and a width central line of the third magnetism isolating bridge are intersected in Q3b.

In some embodiments of the present utility model, in some embodiments,

aq=67.5 deg, the radius of all arc sections is 0.8-1.5mm, the first air groove and the second air groove are rectangular structures, the range of the length L is 14-16mm, and the length direction is perpendicular to the width direction.

The utility model also provides a permanent magnet auxiliary synchronous reluctance motor which comprises the rotor structure of the permanent magnet auxiliary synchronous reluctance motor.

The rotor structure of the permanent magnet auxiliary synchronous reluctance motor and the permanent magnet auxiliary synchronous reluctance motor provided by the utility model have the following beneficial effects:

1. the utility model sets the width B of the air groove along the circumferential direction and the width w1 of the first magnetism isolating bridge along the circumferential direction to meet the constraint relation: b= (3.5-3.7) ×10ζ 8/(w 1×nmax 2), where nmax is the highest rotation speed of the motor design, which can effectively limit the width range of the air slot, and the intersection point of the connecting line between the end of the first air slot closest to the center line and the end of the second air slot closest to the center line and the center line is the intersection point of the radial outer end of the first magnetic isolation bridge Q1 of N level and the center line with the center line at P, so as to satisfy the ratio MN/mp=0.5-0.52 of the distance between MN and MP, and effectively limit the radial position of the air slot, so that the size and the positional relationship of the air slot are limited together, and the electromagnetic performance is not affected by the air slot too close to the radial outer side, and the centrifugal force of the rotor is too high, and the centrifugal force of the rotor is also not too low by the air slot too close to the radial inner side, and the centrifugal force of the rotor is effectively ensured when the centrifugal force generated when the rotor rotates at high speed is reduced, the centrifugal force when the centrifugal force of the rotor rotates is reduced, the motor of the magnetic isolation bridge is reduced, the magnetic isolation bridge is stressed by the magnetic bridge is greatly when the rotor is rotated at high speed, and the mechanical stress is greatly receives the rotor is stressed when the rotor is relatively high;

2. The shortest distance x between the first air groove and the first magnetic steel groove along the circumferential direction is set to be 3-3.3mm, so that the distance between the first magnetic steel groove and the first air groove is limited not to be too close, the side, facing the center line, of the first air groove is the first side of the first air groove, the side, facing the center line, of the second air groove is the first side of the second air groove, the included angle between the first side of the first air groove and the first side of the second air groove is Ak, and the value range of Ak is as follows: ak=360 deg/pole + -2 deg, which can define the included angle between two air grooves, so that the air grooves and the magnetic steel grooves are parallel as far as possible, and the air grooves and the magnetic steel grooves are prevented from being separated relatively close (the gap is too small, the magnetic density is too high, and the force is not generated), and the air grooves and the magnetic steel grooves are prevented from being separated relatively far, mainly from being separated too close; therefore, the range limitation of X and Ak can limit the distance between the air groove and the magnetic steel groove not to be too small, thereby preventing the conditions of magnetic density saturation and flux linkage reduction, reducing harmonic content and improving electromagnetic performance.

3. The utility model also sets the relation between the width W2 of the second magnetic isolation bridge and the third magnetic isolation bridge and the width W1 of the first magnetic isolation bridge to meet the condition that W2-w1=0.2-0.4 mm, so that the widths of the second magnetic isolation bridge and the third magnetic isolation bridge are as large as possible, and the widths are increased and the stresses to which the second magnetic isolation bridge and the third magnetic isolation bridge are subjected are reduced as much as possible because the stresses to which the second magnetic isolation bridge and the third magnetic isolation bridge are subjected are larger than those of the middle (first) magnetic isolation bridge, so that the stresses are as uniform as possible; deformation caused by overlarge stress of a certain magnetic isolation bridge is avoided;

4. The utility model also uses the included angle between the connecting line of Q1a and Q2b and the connecting line of Q1a and Q3b as A1, and the included angle between the connecting line of Q1b and Q2a and the connecting line of Q1b and Q3a as A2; the included angle between the width central line of the second magnetic isolation bridge and the width central line of the third magnetic isolation bridge is Aq, and A1, A2 and Aq have a constraint relation: a1< Aq < A2, the intersection point of the central lines of the second and third magnetic isolation bridges is positioned in the area between the upper and lower ends of the first magnetic isolation bridge, so that the stress direction born by the magnetic isolation bridges Q2 and Q3 is parallel to the central line of the magnetic isolation bridge, and the magnetic isolation bridges Q2 and Q3 only bear tensile stress, so that the stress born by the magnetic isolation bridges is relatively uniform.

Drawings

FIG. 1 is a schematic diagram of a rotor structure of a permanent magnet assisted synchronous reluctance motor of the present utility model;

FIG. 2 is a schematic diagram of a rotor structure of a permanent magnet assisted synchronous reluctance motor according to the present utility model;

FIG. 3 is a third schematic diagram of the rotor structure of the permanent magnet assisted synchronous reluctance motor of the present utility model;

FIG. 4 is a schematic diagram of a rotor structure of a permanent magnet assisted synchronous reluctance motor according to the present utility model;

FIG. 5 is a schematic diagram of a rotor structure of a permanent magnet assisted synchronous reluctance motor according to the present utility model;

FIG. 6 is a schematic diagram of a rotor structure of a permanent magnet assisted synchronous reluctance motor according to the present utility model;

FIG. 7 is a schematic diagram of a rotor structure of a permanent magnet assisted synchronous reluctance motor according to the present utility model;

FIG. 8 is a schematic diagram of a rotor structure of a permanent magnet assisted synchronous reluctance motor according to the present utility model;

FIG. 9 is one of the partial enlarged schematic views of the magnetically isolated bridge of the rotor structure of the present utility model;

FIG. 10 is a second enlarged partial schematic view of a magnetic barrier of the rotor structure of the present utility model.

FIG. 11 is a diagram showing a comparison of the stress simulation of the rotor core according to the present utility model with a conventional rotor core;

FIG. 12 is a graph of stress distribution of a rotor core magnetic gap bridge (the stress of the magnetic gap bridge is relatively uniform);

fig. 13 is a graph showing a comparison of stress simulation at a conventional rotor core magnetic barrier bridge with a scheme of the present utility model.

The reference numerals are:

1. a rotor core; 2. a magnetic steel groove; 21. a first magnetic steel groove; 22. a second magnetic steel groove; 23. a third magnetic steel groove; 24. a fourth magnetic steel groove; 25. a fifth magnetic steel groove; 3. magnetic steel; 31. a first magnetic steel; 32. a second magnetic steel; 33. a third magnetic steel; 34. fourth magnetic steel; 35. fifth magnetic steel; 4. an air tank; 41. a first air tank; 42. a second air tank;

I. a center line; q1, a first magnetism isolating bridge; q2, a second magnetism isolating bridge; q3, a third magnetism isolating bridge; 211. a first magnetic steel groove first edge; 212. a second side of the first magnetic steel groove; 213. a third side of the first magnetic steel groove; 221. a first edge of the second magnetic steel groove; 222. a second magnetic steel groove second side; 223. a third side of the second magnetic steel groove; 231. a first edge of the third magnetic steel groove; 232. a second side of the third magnetic steel groove; 233. a third side of the third magnetic steel groove; 241. a fourth magnetic steel groove first edge; 242. a second side of the fourth magnetic steel groove; 243. a fourth magnetic steel groove third side; 251. a fifth magnetic steel groove first edge; 252. a second side of the fifth magnetic steel groove; 253. a fifth magnetic steel groove third side; 254. a fifth magnetic steel groove fourth side; 411. a first air slot first edge; 412. a first air slot second side; 421. a second air slot first edge; 422. a second air slot second side;

O, a rotor center point; p, the end point of the first magnetism isolating bridge, which is close to one side of the outer edge of the rotor; n, the first air groove and the second air groove are close to the intersection point of the vertex connecting line of the central line and the central line; m, the intersection point of the central line and the outer edge of the rotor; ak. The first air groove first side and the second air groove first side form an included angle; B. the width of the air groove; l, length of air groove; x, the shortest distance between the first air groove and the first magnetic steel groove; w1, width of the first magnetic isolation bridge Q1; w2, the widths of the second and third magnetic bridges Q2 and Q3; aq, the included angle between the central line of the second magnetic isolation bridge Q2 and the central line of the third magnetic isolation bridge Q3;

q1a, the end point of one side of the first magnetism isolating bridge, which is close to the outer edge of the rotor; q1b, the end point of the first magnetism isolating bridge near the center point of the rotor; q2a, the second magnetism isolating bridge is close to the end point of one side of the central line I; q2b, the second magnetism isolating bridge is far away from the end point of one side of the center line I of the rotor; q3a, the end point of the third magnetism isolating bridge close to one side of the central line I; q3b, the end point of one side of the third magnetism isolating bridge far away from the center line I of the rotor; a1, angles between straight lines Q1a and Q2b and straight lines Q1a and Q3 b; a2, straight lines Q1b, Q2a and straight lines Q1b, Q3 a.

Detailed Description

The following description of the embodiments of the present utility model 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 utility model, 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 utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

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 example embodiments in accordance with 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 utility model 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 utility model, 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 utility model 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 utility model; 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 at … …," "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 of "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 utility model.

As shown in fig. 1 to 13, the present utility model provides a rotor structure of a permanent magnet auxiliary synchronous reluctance motor, which includes:

a rotor core 1, the rotor core having a plurality of magnetic poles, in any magnetic pole and located in an axial projection plane, the rotor core 1 having a center line I, the center line I extending radially outward from a center of the rotor core 1 and intersecting a radial outer circumference of the rotor core 1 at a point M, the rotor core 1 being provided with at least two air slots 4 including a first air slot 41 and a second air slot 42, the first air slot 41 and the second air slot 42 being symmetrically arranged with respect to the center line I, the rotor core 1 being provided with at least two magnetic steel slots 2 including a first magnetic steel slot 21 closest to the first air slot 41 and a second magnetic steel slot 22 closest to the second air slot 42, the first magnetic steel slot 21 and the second magnetic steel slot 22 also being symmetrically arranged with respect to the center line I;

The width of the air slot 4 along the circumferential direction is B, a space (i.e. a part of the first magnetic steel slot, which is an approximately triangular area located at the innermost side in the radial direction) on the radially inner side of the first magnetic steel slot 21 and a space (i.e. a part of the second magnetic steel slot, which is an approximately triangular area located at the innermost side in the radial direction, as shown in fig. 3-4) on the radially inner side of the second magnetic steel slot 22 are a first magnetic bridge Q1, the width of the first magnetic bridge Q1 is w1 (the width is the minimum distance between two opposite sides of the first and second magnetic steel slots, preferably the two opposite sides of the two magnetic steel slots are parallel, and therefore the minimum distances of the different positions are the same, so the width w1 is constant), where there is a constraint relationship: b= (3.5-3.7) ×10ζ8/(w 1×nmax ζ2), wherein nmax is the motor design maximum rotation speed, an intersection point of a connecting line between an end of the first air groove 41 closest to the center line and an end of the second air groove 22 closest to the center line and the center line I is N, a radially outer end of the first magnetically isolated bridge Q1 intersects the center line I at P, and a ratio MN/mp=0.5-0.52 of a distance of MN to a distance of MP.

The utility model sets the width B of the air groove along the circumferential direction and the width w1 of the first magnetism isolating bridge along the circumferential direction to meet the constraint relation: b= (3.5-3.7) ×10ζ 8/(w 1×nmax 2), wherein nmax is the highest rotational speed of the motor design, the width range of the air slot can be effectively limited, the intersection point of the connecting line between the end of the first air slot closest to the center line and the end of the second air slot closest to the center line and the center line is the intersection point of the radial outer end of the first magnetic isolation bridge Q1 of N level and the center line with the center line at P, the ratio MN/MP=0.5-0.52 of the distance between MN and MP is satisfied, the radial position of the air slot can be effectively limited, the size and the position relation of the air slot are limited jointly, the electromagnetic performance is not influenced by the fact that the air slot is too close to the radial outer side, the centrifugal force of the rotor is too high because the air slot is too close to the radial inner side, the centrifugal force of the rotor is also effectively ensured when the centrifugal force of the rotor is reduced, the centrifugal force of the magnetic isolation bridge is reduced when the rotor rotates at high speed is reduced, the motor of the magnetic isolation bridge is reduced, the problem that the magnetic isolation of the rotor is stressed by high magnetic isolation is greatly when the rotor is stressed is solved, and the mechanical stress is greatly when the rotor is stressed when the rotor is high is stressed.

According to the utility model, through designing the magnetism isolating bridge and the air groove on the rotor core, the mechanical strength problem of the permanent magnet auxiliary synchronous reluctance motor rotor under the high-speed working condition is solved from the two aspects of reducing the centrifugal force of the rotor core and reducing the maximum stress value on the magnetism isolating bridge.

The improvement points of the utility model are as follows:

1. aiming at the problem of insufficient mechanical strength of a rotor of a permanent magnet auxiliary synchronous reluctance motor under a high-speed working condition, the utility model designs a motor for a logistics vehicle with 3-4.5t through designing a magnetism isolating bridge and an air groove on a rotor core, wherein the outer diameter of a motor stator is 230mm, the peak power is 70Kw-80Kw, the peak torque is 200Nm-300Nm, and the peak rotating speed is 9000rpm-12000rpm. The utility model designs the air groove on the rotor structure, greatly reduces the centrifugal force born by the rotor core during high-speed rotation, reduces the stress born by the magnetism isolating bridge and improves the mechanical strength of the rotor.

2. Through the design of the magnetic isolation bridge, the stress of the magnetic isolation bridge mainly bearing the centrifugal force is more consistent, and the phenomenon that the rotor core is excessively deformed due to overlarge local stress of a certain magnetic isolation bridge caused by uneven stress of the magnetic isolation bridge is avoided; the problem of separate magnetic bridge local stress increase that the magnetic bridge appears stretching and bending combined action and leads to is solved. The mechanical strength of the rotor is improved, the reliability of the motor is improved, and the electromagnetic performance and the torque output capability of the motor are ensured.

Solves the following technical problems:

1. the centrifugal force born by the rotor core during high-speed rotation is greatly reduced, the stress born by the magnetism isolating bridge is reduced, and the mechanical strength of the rotor is improved;

2. the output torque of the motor is ensured, the harmonic content of the motor is reduced, and the torque pulsation of the motor is reduced;

3. the problem that the mechanical strength of a rotor of the permanent magnet auxiliary synchronous reluctance motor is insufficient under a high-speed working condition is solved; (by reducing stress);

4. the problem that the rotor iron core is excessively deformed due to overlarge local stress of a certain magnetic isolation bridge caused by uneven stress of the magnetic isolation bridge is solved;

5. the problem of separate magnetic bridge local stress increase that the magnetic bridge appears stretching and bending combined action and leads to is solved.

In some embodiments of the present utility model, in some embodiments,

b=4.5/w 1, w1=1.5-2 mm. The air slot width and the first magnetic isolation bridge width w1 are further optimized, the electromagnetic performance is effectively ensured while the larger centrifugal force generated during high-speed rotation is further reduced through further optimized limitation, the centrifugal force during iron core rotation is reduced, the stress of the magnetic isolation bridge is reduced, and the problem that the rotor core of the permanent magnet auxiliary synchronous reluctance motor receives the larger centrifugal force during high-speed rotation, the stress received by the magnetic isolation bridge is larger, and the mechanical strength of the rotor is lower is solved.

In some embodiments of the present utility model, in some embodiments,

w1=1.8 mm, nmax=9000 rpm, mn/mp=0.515. The air slot is a preferable ratio relation of preferable width, preferable motor rotating speed and preferable MN/MP, the preferable relation is used for limiting the larger centrifugal force generated during high-speed rotation, simultaneously effectively ensuring electromagnetic performance, reducing the centrifugal force during iron core rotation, reducing the stress of a magnetism isolating bridge, and solving the problem that the rotor core of the permanent magnet auxiliary synchronous reluctance motor receives the larger centrifugal force during high-speed rotation, so that the magnetism isolating bridge receives the larger stress, and the mechanical strength of the rotor is lower.

In some embodiments of the present utility model, in some embodiments,

the first air slot 41 and the first magnetic steel slot 21 are located on the same side in the circumferential direction of the central line I, the shortest distance between the first air slot 41 and the first magnetic steel slot 21 along the circumferential direction is x, the value range of x is 3-3.3mm, the side, facing the central line I, of the first air slot 41 is a first air slot first side 411, the side, facing the central line I, of the second air slot 42 is a second air slot first side 421, and the included angle between the first air slot first side 411 and the second air slot first side 421 is Ak, and the value range of Ak is: ak=360 deg/pole±2deg, pole is the number of poles, and deg is the degree of angle.

The shortest distance x between the first air groove and the first magnetic steel groove along the circumferential direction is set to be 3-3.3mm, so that the distance between the first magnetic steel groove and the first air groove is limited not to be too close, the side, facing the center line, of the first air groove is the first side of the first air groove, the side, facing the center line, of the second air groove is the first side of the second air groove, the included angle between the first side of the first air groove and the first side of the second air groove is Ak, and the value range of Ak is as follows: ak=360 deg/pole + -2 deg, which can define the included angle between two air grooves, so that the air grooves and the magnetic steel grooves are parallel as far as possible, and the air grooves and the magnetic steel grooves are prevented from being separated relatively close (the gap is too small, the magnetic density is too high, and the force is not generated), and the air grooves and the magnetic steel grooves are prevented from being separated relatively far, mainly from being separated too close; therefore, the range limitation of X and Ak can limit the distance between the air groove and the magnetic steel groove not to be too small, thereby preventing the conditions of magnetic density saturation and flux linkage reduction, reducing harmonic content and improving electromagnetic performance.

In some embodiments of the present utility model, in some embodiments,

x=3.14 mm; ak=360 deg/pole, pole 8. The optimal numerical value of the shortest distance x between the first air groove and the first magnetic steel groove along the circumferential direction and the optimal numerical value of the Ak and the polar number can further limit the distance between the air groove and the magnetic steel groove not to be too small, so that the conditions of magnetic density saturation and flux linkage reduction are prevented, the harmonic content is reduced, and the electromagnetic performance is improved.

The utility model comprises an air groove design and a magnetism isolating bridge design, and the improvement is that:

1. and (5) designing an air groove. The length of the air groove is L, the value range of L is 14-16mm, and L=14.5 mm is preferable; the width of the air groove is B, the width of the first magnetism isolating bridge Q1 is w1, the width of the second magnetism isolating bridge Q2 and the width of the third magnetism isolating bridge Q3 are w2, and the constraint relation exists: b= (3.5-3.7) ×10ζ8/(w1×nmax 2), preferably b=4.5/w 1, and w1=1.5-2 mm, preferably w1=1.8 mm; the intersection point of the central line and the outer edge of the rotor is M, the intersection point of the connecting line of the vertex of the first air groove and the second air groove, which is close to the central line, and the central line is N, the end point of the first magnetism isolating bridge Q1, which is close to one side of the outer edge of the rotor, is P, wherein the ratio of the distance of MN to the distance of MP is 0.5-0.52, and preferably 0.515. The constraint relation can greatly reduce the centrifugal force born by the rotor core during high-speed rotation and reduce the stress born by the magnetism isolating bridge, so that the mechanical strength of the rotor is improved, and the reliability of the motor is improved. The shortest distance between the first air groove and the first magnetic steel groove is x, and the value range of x is 3-3.3mm, preferably x=3.14 mm; the included angle between the first air slot first edge 411 and the second air slot first edge 421 is Ak, and the value range of Ak is: ak=360 deg/pole±2deg, (pole is the number of poles, which is 8 in this case), preferably ak=360 deg/pole. The distance x and the included angle Ak can avoid saturation of magnetic density and flux linkage drop of the rotor core, reduce harmonic content of the motor and improve electromagnetic performance of the rotor.

In some embodiments of the present utility model, in some embodiments,

the magnetic steel grooves 2 further comprise a third magnetic steel groove 23 positioned on one side of the first magnetic steel groove 21, which is far away from the circumference of the center line I, and a fourth magnetic steel groove 24 positioned on one side of the second magnetic steel groove 22, which is far away from the circumference of the center line I, the magnetic steel grooves 2 further comprise fifth magnetic steel grooves 25 positioned on the radial inner sides of the first magnetic steel groove 21 and the second magnetic steel groove 22, the third magnetic steel groove 23 and the fourth magnetic steel groove 24 are symmetrically arranged relative to the center line I, and the fifth magnetic steel grooves 25 are also symmetrically arranged relative to the center line I.

The magnetic steel is arranged in the third magnetic steel groove, the fourth magnetic steel groove and the fifth magnetic steel groove, so that the electromagnetic performance of the rotor core is further improved.

Fig. 1 is a schematic diagram of a rotor structure of the present utility model, a rotor core 1 is provided with a magnetic steel groove 2, a magnetic steel 3 and an air groove 4, the magnetic steel 3 is installed inside the magnetic steel groove 2, and a magnetism isolating bridge is formed between the magnetic steel groove and the magnetic steel groove or between the magnetic steel groove and the outer edge of the rotor core. Fig. 1 is a schematic diagram of an eighth structure of a rotor according to the present utility model, which is a magnetic pole of the rotor according to the present utility model, and the structure thereof is symmetrical about a center line I.

The magnetic steel grooves 2 comprise a first magnetic steel groove 21, a second magnetic steel groove 22, a third magnetic steel groove 23, a fourth magnetic steel groove 24 and a fifth magnetic steel groove 25; the magnetic steel 3 comprises a first magnetic steel 31, a second magnetic steel 32, a third magnetic steel 33, a fourth magnetic steel 34 and a fifth magnetic steel 35; the air grooves include a first air groove 41 and a second air groove 42. The first, second, third, fourth and fifth magnetic steels 31, 32, 33, 34, 35 are respectively mounted to the first, second, third, fourth and fifth magnetic steel grooves 21, 22, 23, 24, 25. The third magnetic steel groove 23, the fourth magnetic steel groove 24 and the fifth magnetic steel groove 25 form a first layer, the first magnetic steel groove 21 and the second magnetic steel groove 22 form a second layer, the first air groove 41 and the second air groove 42 form a third layer, and the three layers show a UVV structure.

In some embodiments of the present invention, in some embodiments,

a second bridge Q2 is spaced between the radially inner cavity of the third magnetic steel groove 23 (i.e., as shown in fig. 3-4, the cavity belongs to a part of the third magnetic steel groove and is an approximately triangular area located at the radially innermost side) and the fifth magnetic steel groove 25 closest to the third magnetic steel groove 23, and a third bridge Q3 is spaced between the radially inner cavity of the fourth magnetic steel groove 24 (i.e., as shown in fig. 3-4, the cavity belongs to a part of the fourth magnetic steel groove and is an approximately triangular area located at the radially innermost side) and the fifth magnetic steel groove 25 closest to the fourth magnetic steel groove 24; the width w2 of the second magnetic isolation bridge Q2 and the width w3 of the third magnetic isolation bridge Q3 (the width of the second magnetic isolation bridge Q2 is the minimum distance between the two opposite sides of the third and fifth magnetic steel grooves, preferably the two opposite sides of the third and fifth magnetic steel grooves are parallel, and thus the width w2 is constant; the width of the third magnetic isolation bridge Q3 is the minimum distance between the two opposite sides of the fourth and fifth magnetic steel grooves, preferably the two opposite sides of the fourth and fifth magnetic steel grooves are parallel, and thus the width w3 is constant);

And there is a constraint relationship: w2-w1=0.2-0.4 mm.

The utility model also sets the relation between the width W2 of the second magnetic isolation bridge and the third magnetic isolation bridge and the width W1 of the first magnetic isolation bridge to meet the condition that W2-w1=0.2-0.4 mm, so that the widths of the second magnetic isolation bridge and the third magnetic isolation bridge are as large as possible, and the widths are increased and the stresses to which the second magnetic isolation bridge and the third magnetic isolation bridge are subjected are reduced as much as possible because the stresses to which the second magnetic isolation bridge and the third magnetic isolation bridge are subjected are larger than those of the middle (first) magnetic isolation bridge, so that the stresses are as uniform as possible; avoiding deformation caused by overlarge stress of a certain magnetic isolation bridge.

In some embodiments of the present utility model, in some embodiments,

in the projection plane of the axial end face of the rotor core 1: the first magnetic isolation bridge Q1 is in a rectangular structure, a side of the first magnetic isolation bridge Q1 located at the radial outer side intersects with the central line I at a point Q1a, and a side of the first magnetic isolation bridge Q1 located at the radial inner side intersects with the central line I at a point Q1b;

the second magnetic isolation bridge Q2 is of a rectangular structure, the midpoint of the length of the side, closest to the central line I, of the second magnetic isolation bridge Q2 is Q2a, and the midpoint of the length, farthest from the central line I, of the second magnetic isolation bridge Q2 is Q2b;

the third magnetic isolation bridge Q3 is in a rectangular structure, the midpoint of the length of the side of the third magnetic isolation bridge Q3 closest to the center line I is Q3a, and the midpoint of the length of the side of the third magnetic isolation bridge Q3 farthest from the center line I is Q3b; the included angle between the connecting line of Q1a and Q2b and the connecting line of Q1a and Q3b is A1, and the included angle between the connecting line of Q1b and Q2a and the connecting line of Q1b and Q3a is A2; the included angle between the width center line of the second magnetic isolation bridge Q2 and the width center line of the third magnetic isolation bridge Q3 is Aq, and A1, A2 and Aq have a constraint relationship: a1< Aq < A2.

The utility model also uses the included angle between the connecting line of Q1a and Q2b and the connecting line of Q1a and Q3b as A1, and the included angle between the connecting line of Q1b and Q2a and the connecting line of Q1b and Q3a as A2; the included angle between the width central line of the second magnetic isolation bridge and the width central line of the third magnetic isolation bridge is Aq, and A1, A2 and Aq have a constraint relation: a1< Aq < A2, the intersection point of the central lines of the second and third magnetism isolating bridges is positioned in the area between the upper and lower ends of the first magnetism isolating bridge, so that the stress directions of the magnetism isolating bridges Q2 and Q3 are parallel to the central lines of the magnetism isolating bridges, the magnetism isolating bridges Q2 and Q3 only receive tensile stress, the stress of the magnetism isolating bridges is uniform (the traditional diagram of FIG. 13 receives bending stress besides tensile force, and the stress is the largest place of 2 circles), and the effect of uniform stress distribution is realized by almost the stress of the four circles.

The second improvement of the utility model is as follows:

2. and (5) designing a magnetic isolation bridge. The width w1 of the first magnetic isolation bridge Q1, the width w2 of the second magnetic isolation bridge Q2 and the width w2 of the third magnetic isolation bridge Q3 have a constraint relation: w2-w1=0.2-0.4 mm, the constraint relation can make the stress magnitude of the three magnetic isolation bridges consistent, and as shown in the figure, excessive deformation of a rotor core caused by overlarge stress of a certain magnetic isolation bridge is avoided, so that abnormal edge rubbing of the rotor is avoided, and the reliability of the motor is influenced. Through the design of the included angle Aq of the central line of the magnetism isolating bridges Q2 and Q3, the stress direction born by the magnetism isolating bridges Q2 and Q3 is parallel to the central line of the magnetism isolating bridges Q2 and Q3, and the magnetism isolating bridges Q2 and Q3 only bear tensile stress, so that the stress born by the magnetism isolating bridges is relatively uniform. Otherwise, the stress direction of the magnetic isolation bridge Q2, Q3 is not parallel to the centerline of the magnetic isolation bridge, and the magnetic isolation bridge is under the combined action of stretching and bending, so that the stress at the local position of the magnetic isolation bridge Q2, Q3 is greatly increased. The maximum stress on the magnetism isolating bridge is reduced, so that the mechanical strength of the rotor is improved, the reliability of the motor is improved, and the electromagnetic performance and the torque output capability of the motor are ensured.

In some embodiments of the present invention, in some embodiments,

the first magnetic steel groove 21 includes a first magnetic steel groove first edge 211, a first magnetic steel groove second edge 212, and a first magnetic steel groove third edge 213, wherein the first magnetic steel groove first edge 211 faces the center line I, the first magnetic steel groove second edge 212 is located radially inward of the first magnetic steel groove first edge 211 and opposite to the second magnetic steel groove 22, and the first magnetic steel groove third edge 213 is located radially inward of the first magnetic steel groove first edge 211 and opposite to the fifth magnetic steel groove 25; the second magnetic steel groove 22 includes a second magnetic steel groove first edge 221, a second magnetic steel groove second edge 222, and a second magnetic steel groove third edge 223, the second magnetic steel groove first edge 221 faces the center line I, the second magnetic steel groove second edge 222 is located radially inward of the second magnetic steel groove first edge 221 and opposite to the first magnetic steel groove 21, and the second magnetic steel groove third edge 223 is located radially inward of the second magnetic steel groove first edge 221 and opposite to the fifth magnetic steel groove 25;

the third magnetic steel groove 23 includes a third magnetic steel groove first edge 231, a third magnetic steel groove second edge 232, and a third magnetic steel groove third edge 233, wherein the third magnetic steel groove first edge 231 faces the first magnetic steel groove 21, the third magnetic steel groove second edge 232 is located radially inward of the third magnetic steel groove first edge 231 and opposite to the fifth magnetic steel groove 25, and the third magnetic steel groove third edge 233 is opposite to the third magnetic steel groove first edge 231; the fourth magnetic steel groove 24 includes a fourth magnetic steel groove first edge 241, a fourth magnetic steel groove second edge 242, and a fourth magnetic steel groove third edge 243, wherein the fourth magnetic steel groove first edge 241 faces the second magnetic steel groove 22, the fourth magnetic steel groove second edge 242 is located radially inward of the fourth magnetic steel groove first edge 241 and opposite to the fifth magnetic steel groove 25, and the fourth magnetic steel groove third edge 243 is opposite to the fourth magnetic steel groove first edge 241;

The fifth magnetic steel groove 25 comprises a fifth magnetic steel groove first edge 251 positioned at the radial outer end and intersected with the central line I, a fifth magnetic steel groove second edge 252 opposite to the third magnetic steel groove second edge 232, a fifth magnetic steel groove third edge 253 opposite to the fourth magnetic steel groove second edge 242 and a fifth magnetic steel groove fourth edge 254 positioned at the radial inner side and intersected with the central line I;

the first magnetic steel groove first edge 211 is connected with the first magnetic steel groove second edge 212, and the second magnetic steel groove first edge 221 is connected with the second magnetic steel groove second edge 222; the first magnetic steel groove second edge 212 is connected with the first magnetic steel groove third edge 213 through an arc line segment, and the second magnetic steel groove second edge 222 is connected with the second magnetic steel groove third edge 223 through an arc line segment;

the first side 231 of the third magnetic steel groove is connected with the second side 232 of the third magnetic steel groove through an arc line segment, and the first side 251 of the fifth magnetic steel groove is connected with the second side 252 of the fifth magnetic steel groove through an arc line segment; the third side 233 of the third magnetic steel groove is connected with the second side 232 of the third magnetic steel groove through an arc line segment, and the second side 252 of the fifth magnetic steel groove is connected with the fourth side 254 of the fifth magnetic steel groove through an arc line segment;

The first side 241 of the fourth magnetic steel groove is connected with the second side 242 of the fourth magnetic steel groove through an arc line, and the first side 251 of the fifth magnetic steel groove is connected with the third side 253 of the fifth magnetic steel groove through an arc line; the third side 243 of the fourth magnetic steel groove is connected with the second side 242 of the fourth magnetic steel groove through an arc line, and the third side 253 of the fifth magnetic steel groove is connected with the fourth side 254 of the fifth magnetic steel groove through an arc line.

The first, second, third, fourth and fifth magnetic steel grooves are preferably formed, and stress at the position can be effectively reduced by forming a structure with a plurality of edges and connecting arc segments between certain adjacent edges. The magnetic isolation bridge comprises a first magnetic isolation bridge Q1, a second magnetic isolation bridge Q2 and a third magnetic isolation bridge Q3. The side of the first magnetic steel groove 21, which is close to the first air groove 41, is a first magnetic steel groove first side 211, and one end, which is close to the center point, of the first magnetic steel groove first side 211 is in arc transition connection with a first magnetic steel groove second side 212. The second edge 212 of the first magnetic steel groove is in arc transition connection with the third edge 213 of the first magnetic steel groove, the radius of the arc is 0.8-1.5mm, preferably 1mm, and the arc can avoid stress concentration and improve the mechanical strength of the rotor core. The side of the second magnetic steel groove 22 close to the second air groove 42 is a first side 221 of the second magnetic steel groove, and one end of the first side 221 of the second magnetic steel groove close to the center point is in transition connection with a second side 222 of the second magnetic steel groove through an arc. The second side 222 of the second magnetic steel groove is in arc transition connection with the third side 223 of the second magnetic steel groove, the radius of the arc is 0.8-1.5mm, preferably 1mm, and the arc can avoid stress concentration and improve the mechanical strength of the rotor core. The first magnet steel groove second side 212 and the second magnet steel groove second side 222 form a first magnetism isolating bridge Q1.

In some embodiments of the present invention, in some embodiments,

the line between the intersection point of the first magnetic steel groove first edge 211 and the first magnetic steel groove second edge 212 and the intersection point of the second magnetic steel groove first edge 221 and the second magnetic steel groove second edge 222 intersects the center line I to form a Q1a;

the intersection point of the extension line of the second side 212 of the first magnetic steel groove and the extension line of the third side 213 of the first magnetic steel groove and the intersection point of the extension line of the second side 222 of the second magnetic steel groove and the extension line of the third side 223 of the second magnetic steel groove and the center line I are intersected at the Q1b;

the intersection point of the extension line of the third magnetic steel groove first side 231 and the extension line of the third magnetic steel groove second side 232 and the intersection point of the extension line of the fifth magnetic steel groove first side 251 and the extension line of the fifth magnetic steel groove second side 252 intersect with the width center line of the second magnetism isolating bridge Q2 at the Q2a; the intersection point of the extension line of the third side 233 of the third magnetic steel groove and the extension line of the second side 232 of the third magnetic steel groove and the intersection point of the extension line of the second side 252 of the fifth magnetic steel groove and the extension line of the fourth side 254 of the fifth magnetic steel groove intersect with the width center line of the second magnetism isolating bridge Q2 at the Q2b;

A connecting line between an extension line of the fourth magnetic steel groove first side 241 and an extension line of the fourth magnetic steel groove second side 242 and an extension line of the fifth magnetic steel groove first side 251 and an extension line of the fifth magnetic steel groove third side 253 and a width center line of the third magnetism isolating bridge Q3 intersect at the Q3a; and a connecting line between an extension line of the third side 243 of the fourth magnetic steel groove and an extension line of the second side 242 of the fourth magnetic steel groove and an intersection line between an extension line of the third side 253 of the fifth magnetic steel groove and an extension line of the fourth side 254 of the fifth magnetic steel groove and a width central line of the third magnetism isolating bridge Q3 are intersected at the Q3b.

The preferred forming and confirming mode for forming the magnetic isolation bridges Q1a, Q1b, Q2a, Q2b, Q3a and Q3b can further enable the stress directions of the magnetic isolation bridges Q2 and Q3 to be parallel to the central line of the magnetic isolation bridges, and the magnetic isolation bridges Q2 and Q3 only receive tensile stress, so that the stress of the magnetic isolation bridges is relatively uniform.

The side of the third magnetic steel groove 23, which is close to the first magnetic steel groove 21, is a first side 231 of the third magnetic steel groove, and one end, which is close to the center point, of the first side 231 of the third magnetic steel groove is in arc transition connection with a second side 232 of the third magnetic steel groove. The second side 232 of the third magnetic steel groove is in arc transition connection with the third side 233 of the third magnetic steel groove, and the radius of the arc is 0.8-1.5mm, preferably 1mm. The side of the fourth magnetic steel groove 24, which is close to the second magnetic steel groove 22, is a first side 241 of the fourth magnetic steel groove, and one end, which is close to the center point, of the first side 241 of the fourth magnetic steel groove is in arc transition connection with a second side 242 of the fourth magnetic steel groove. The second side 242 of the fourth magnetic steel groove is in arc transition connection with the third side 243 of the fourth magnetic steel groove, and the radius of the arc is 0.8-1.5mm, preferably 1mm. The fifth magnetic steel groove 25 is formed by a first side 251 of the fifth magnetic steel groove, a second side 252 of the fifth magnetic steel groove, a third side 253 of the fifth magnetic steel groove and a fourth side 254 of the fifth magnetic steel groove, and is in an isosceles trapezoid shape, and the first side 251 of the fifth magnetic steel groove and the fourth side 254 of the fifth magnetic steel groove are parallel sides. The edges of the fifth magnetic steel groove are in arc transition connection, wherein the radius of an arc at the two ends of the fourth side 254 of the fifth magnetic steel groove is 0.8-1.5mm, preferably 1mm. All the circular arcs are the circular arcs at the two ends of the magnetic isolation bridge, and can avoid local stress concentration of the magnetic isolation bridge and improve the mechanical strength of the rotor core. The third magnetic steel groove second side 232 and the fifth magnetic steel groove second side 252 form a magnetic isolation bridge Q2, and the fourth magnetic steel groove second side 242 and the fifth magnetic steel groove third side 253 form a magnetic isolation bridge Q3.

Further explanation is as follows: q1a is the intersection point of the centerline I and the connecting line between the connecting point of the first magnetic steel groove first side 211 and the first magnetic steel groove second side 212 and the connecting point of the second magnetic steel groove first side 221 and the second magnetic steel groove second side 222; q1b is the intersection point of the central line I and the connecting line between the intersection point of the extension lines of the first magnetic steel groove second side 212 and the first magnetic steel groove third side 213 and the intersection point of the extension lines of the second magnetic steel groove second side 222 and the second magnetic steel groove third side 223; q2a is an intersection point between a line connecting the intersection points of the extension lines of the third magnetic steel first side 231 and the third magnetic steel groove second side 232 and the intersection points of the extension lines of the fifth magnetic steel groove first side 251 and the fifth magnetic steel groove second side 252 and the middle line of the second magnetism isolating bridge Q2; q2b is an intersection point of a line between the intersection point of the extension lines of the third magnetic steel second side 232 and the third magnetic steel groove third side 233 and the intersection point of the extension lines of the fifth magnetic steel groove second side 252 and the fifth magnetic steel groove fourth side 254 and the middle line of the second magnetism isolating bridge Q2; q3a is an intersection point of a line between an intersection point of extension lines of the fourth magnetic steel first side 241 and the fourth magnetic steel groove second side 242 and an intersection point of extension lines of the fifth magnetic steel groove first side 251 and the fifth magnetic steel groove third side 253 and a center line of the third magnetism isolating bridge Q3; q3b is an intersection point of a line between the intersection point of the extension lines of the fourth magnetic steel second side 242 and the fourth magnetic steel groove third side 243 and the intersection point of the extension lines of the fifth magnetic steel groove third side 253 and the fifth magnetic steel groove fourth side 254 and the center line of the third magnetism isolating bridge Q3.

In some embodiments of the present utility model, in some embodiments,

aq=67.5 deg, the radius of all arc sections is 0.8-1.5mm, the first air groove 41 and the second air groove 42 are rectangular structures, the range of the length L is 14-16mm, and the length direction is perpendicular to the width direction.

The first air groove 41 and the second air groove 42 are rectangular, the edges are connected through arc transition, the two air grooves are symmetrical about the central line I and are in an eight shape, and the opening faces the outer edge of the rotor. The long side of the first air groove 41 close to the central line is a first air groove first side 411, and the long side parallel to the first air groove is a first air groove second side 412; the long side of the second air groove 42 near the center line is a second air groove first side 421, and the long side parallel to the long side is a second air groove second side 422.

The utility model is used for the motor of the 3-4.5t logistics vehicle, the outer diameter of the motor stator is 230mm, the peak power is 70Kw-80Kw, the peak torque is 200Nm-300Nm, and the peak rotating speed is 9000rpm-12000rpm.

As shown in fig. 7, the length of the air groove is L, and the value range of L is 14-16mm, preferably l=14.5 mm; the width of the air groove is B, the width of the first magnetism isolating bridge Q1 is w1, the width of the second magnetism isolating bridge Q2 and the width of the third magnetism isolating bridge Q3 are w2, and the constraint relation exists: b=4.5/w 1, and w1=1.5-2 mm, preferably w1=1.8 mm; the intersection point of the central line and the outer edge of the rotor is M, the intersection point of the connecting line of the vertex of the first air groove and the second air groove, which is close to the central line, and the central line is N, the end point of the first magnetism isolating bridge Q1, which is close to one side of the outer edge of the rotor, is P, wherein the ratio of the distance of MN to the distance of MP is 0.5-0.52, and preferably 0.515. The constraint relation can greatly reduce the centrifugal force born by the rotor core during high-speed rotation and reduce the stress born by the magnetism isolating bridge, as shown in figure 11, so that the mechanical strength of the rotor is improved and the reliability of the motor is improved. The shortest distance between the first air groove and the first magnetic steel groove is x, and the value range of x is 3-3.3mm, preferably x=3.14 mm; the included angle between the first air slot first edge 411 and the second air slot first edge 421 is Ak, and the value range of Ak is: ak=360 deg/pole±2deg, (pole is the number of poles, preferably 8 in the present utility model), preferably ak=360 deg/pole. The distance x and the included angle Ak can avoid saturation of magnetic density and flux linkage drop of the rotor core, reduce harmonic content of the motor and improve electromagnetic performance of the rotor. The width w1 of the first magnetic isolation bridge Q1, the width w2 of the second magnetic isolation bridge Q2 and the width w2 of the third magnetic isolation bridge Q3 have a constraint relation: the constraint relation of W2-w1=0.2-0.4 mm can make the stress magnitude of the three magnetic isolation bridges consistent, as shown in fig. 12, so that excessive deformation of the rotor core caused by overlarge stress of a certain magnetic isolation bridge is avoided, and the rotor edge rubbing abnormality is avoided, and the reliability of the motor is influenced.

As shown in fig. 9, the end point of the first magnetism isolating bridge Q1 near the outer edge of the rotor is Q1a, and the other end point is Q1b; the end point of the second magnetism isolating bridge Q2 close to the central line I is Q2a, and the other end point is Q2b; the end point of the third magnetism isolating bridge Q3 close to the central line I is Q3a, and the other end point is Q3b; the included angles between the straight lines Q1a and Q2b and the straight lines Q1a and Q3b are A1, and the included angles between the straight lines Q1b and Q2a and the straight lines Q1b and Q3a are A2; the included angle between the central line of the second magnetic isolation bridge Q2 and the central line of the third magnetic isolation bridge Q3 is Aq, and the included angle Aq has a constraint relationship: a1< Aq < A2, preferably aq=67.5 deg, the constraint relation being such that the intersection of the centerline of the bridge Q2 and the centerline of the bridge Q3 is located on the centerline I between the two ends Q1a and Q1b of the bridge Q1. The included angle Aq can enable the stress direction born by the magnetism isolating bridges Q2 and Q3 to be parallel to the center line of the magnetism isolating bridge, and the magnetism isolating bridges Q2 and Q3 only receive tensile stress, so that the stress born by the magnetism isolating bridges is relatively uniform. Otherwise, the stress direction of the magnetic isolation bridge Q2, Q3 is not parallel to the centerline of the magnetic isolation bridge, and the magnetic isolation bridge is under the combined action of stretching and bending, so that the stress at the local position of the magnetic isolation bridge Q2, Q3 is greatly increased, as shown in fig. 13. When the motor runs at a high speed, the centrifugal force is particularly outstanding, the influence of the centrifugal force is far greater than that of other acting forces, the centrifugal force is proportional to the square of the rotating speed, and the centrifugal force is greatly increased along with the increase of the rotating speed. The centrifugal force applied to the rotor is completely borne by the magnetic isolating bridge, and the maximum stress point is always present on the magnetic isolating bridge. According to the motor, through the design of the center line included angle Aq of the magnetism isolating bridges Q2 and Q3, the magnetism isolating bridges Q2 and Q3 are stressed uniformly, the maximum stress on the magnetism isolating bridges is reduced, so that the mechanical strength of the rotor is improved, the reliability of the motor is improved, and the electromagnetic performance and the torque output capacity of the motor are guaranteed.

The foregoing description of the preferred embodiments of the utility model 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 utility model. The foregoing is merely a preferred embodiment of the present utility model, 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 utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims

1. A rotor structure of a permanent magnet auxiliary synchronous reluctance motor is characterized in that: comprising the following steps:

a rotor core (1) having a plurality of magnetic poles, in any one of the magnetic poles and located in an axial projection plane, the rotor core (1) having a center line (I) extending radially outward from a center of the rotor core (1) and intersecting a radial outer periphery of the rotor core (1) at a point M, at least two air slots (4) being provided on the rotor core (1), including a first air slot (41) and a second air slot (42), the first air slot (41) and the second air slot (42) being symmetrically arranged with respect to the center line (I), at least two magnetic steel slots (2) being provided on the rotor core (1), including a first magnetic steel slot (21) closest to the first air slot (41) and a second magnetic steel slot (22) closest to the second air slot (42), the first magnetic steel slot (21) and the second magnetic steel slot (22) also being symmetrically arranged with respect to the center line (I);

The width of the air groove (4) along the circumferential direction is B, a first magnetism isolating bridge (Q1) is formed between a cavity of the radial inner side of the first magnetic steel groove (21) and a cavity of the radial inner side of the second magnetic steel groove (22), the width of the first magnetism isolating bridge (Q1) is w1, and a constraint relation exists: b= (3.5-3.7) ×10ζ8/(w 1×nmax ζ2), wherein nmax is the motor design highest rotation speed, an intersection point of a connecting line between an end of the first air groove (41) closest to the center line and an end of the second air groove (42) closest to the center line and the center line (I) is N, a radially outer end of the first magnetic shielding bridge Q1 and the center line (I) intersect at P, wherein a ratio MN/mp=0.5-0.52 of a distance of MN to a distance of MP.

2. The permanent magnet assisted synchronous reluctance motor rotor structure according to claim 1, wherein:

B＝4.5/w1，w1＝1.5-2mm。

3. the permanent magnet-assisted synchronous reluctance motor rotor structure according to claim 2, wherein:

w1＝1.8mm，nmax＝9000rpm，MN/MP＝0.515。

4. the permanent magnet assisted synchronous reluctance motor rotor structure according to claim 1, wherein:

the first air groove (41) and the first magnetic steel groove (21) are positioned on the same side in the circumferential direction of the central line (I), the shortest distance between the first air groove (41) and the first magnetic steel groove (21) along the circumferential direction is x, the value range of x is 3-3.3mm, the side, facing the central line (I), of the first air groove (41) is a first air groove first side (411), the side, facing the central line (I), of the second air groove (42) is a second air groove first side (421), and the included angle between the first air groove first side (411) and the second air groove first side (421) is Ak, and the value range of Ak is: ak=360 deg/pole±2deg, pole is the number of poles, and deg is the degree of angle.

5. The permanent magnet assisted synchronous reluctance motor rotor structure according to claim 4, wherein:

x=3.14 mm; ak=360 deg/pole, pole 8.

6. The permanent magnet assisted synchronous reluctance motor rotor structure according to claim 1, wherein:

the magnetic steel grooves (2) further comprise third magnetic steel grooves (23) which are arranged on one side of the first magnetic steel groove (21) away from the circumference of the central line (I), and fourth magnetic steel grooves (24) which are arranged on one side of the second magnetic steel groove (22) away from the circumference of the central line (I), the magnetic steel grooves (2) further comprise fifth magnetic steel grooves (25) which are arranged on the inner side of the first magnetic steel groove (21) and the second magnetic steel groove (22) in the radial direction, the third magnetic steel grooves (23) and the fourth magnetic steel grooves (24) are symmetrically arranged relative to the central line (I), and the fifth magnetic steel grooves (25) are also symmetrical relative to the central line (I).

7. The permanent magnet assisted synchronous reluctance machine rotor structure according to claim 6, wherein:

a second magnetism isolating bridge (Q2) is arranged between a cavity on the radial inner side of the third magnetic steel groove (23) and the fifth magnetic steel groove (25) closest to the third magnetic steel groove (23), and a third magnetism isolating bridge (Q3) is arranged between the cavity on the radial inner side of the fourth magnetic steel groove (24) and the fifth magnetic steel groove (25) closest to the fourth magnetic steel groove (24); the widths of the second magnetic isolation bridge (Q2) and the third magnetic isolation bridge (Q3) are w2;

And there is a constraint relationship: w2-w1=0.2-0.4 mm.

8. The permanent magnet assisted synchronous reluctance machine rotor structure according to claim 7, wherein:

in the projection plane of the axial end face of the rotor core (1): the first magnetic isolation bridge (Q1) is of a rectangular structure, the side of the first magnetic isolation bridge (Q1) positioned on the radial outer side intersects with the central line (I) at a point Q1a, and the side of the first magnetic isolation bridge (Q1) positioned on the radial inner side intersects with the central line (I) at a point Q1b;

the second magnetic isolation bridge (Q2) is of a rectangular structure, the midpoint of the length of the side, closest to the center line (I), of the second magnetic isolation bridge (Q2) is Q2a, and the midpoint of the length, farthest from the center line (I), of the side of the second magnetic isolation bridge (Q2) is Q2b;

the third magnetic isolation bridge (Q3) is of a rectangular structure, the midpoint of the length of the side, closest to the central line (I), of the third magnetic isolation bridge (Q3) is Q3a, and the midpoint of the length of the side, farthest from the central line (I), of the third magnetic isolation bridge (Q3) is Q3b; the included angle between the connecting line of Q1a and Q2b and the connecting line of Q1a and Q3b is A1, and the included angle between the connecting line of Q1b and Q2a and the connecting line of Q1b and Q3a is A2; an included angle between a width center line of the second magnetic isolation bridge (Q2) and a width center line of the third magnetic isolation bridge (Q3) is Aq, and A1, A2 and Aq have a constraint relation: a1< Aq < A2.

9. The permanent magnet assisted synchronous reluctance motor rotor structure according to claim 8, wherein:

the first magnetic steel groove (21) comprises a first magnetic steel groove first edge (211), a first magnetic steel groove second edge (212) and a first magnetic steel groove third edge (213), the first magnetic steel groove first edge (211) faces the central line (I), the first magnetic steel groove second edge (212) is positioned on the radial inner side of the first magnetic steel groove first edge (211) and opposite to the second magnetic steel groove (22), and the first magnetic steel groove third edge (213) is positioned on the radial inner side of the first magnetic steel groove first edge (211) and opposite to the fifth magnetic steel groove (25); the second magnetic steel groove (22) comprises a second magnetic steel groove first edge (221), a second magnetic steel groove second edge (222) and a second magnetic steel groove third edge (223), the second magnetic steel groove first edge (221) faces the central line (I), the second magnetic steel groove second edge (222) is positioned on the radial inner side of the second magnetic steel groove first edge (221) and opposite to the first magnetic steel groove (21), and the second magnetic steel groove third edge (223) is positioned on the radial inner side of the second magnetic steel groove first edge (221) and opposite to the fifth magnetic steel groove (25);

the third magnetic steel groove (23) comprises a third magnetic steel groove first edge (231), a third magnetic steel groove second edge (232) and a third magnetic steel groove third edge (233), the third magnetic steel groove first edge (231) faces the first magnetic steel groove (21), the third magnetic steel groove second edge (232) is positioned on the radial inner side of the third magnetic steel groove first edge (231) and opposite to the fifth magnetic steel groove (25), and the third magnetic steel groove third edge (233) is opposite to the third magnetic steel groove first edge (231); the fourth magnetic steel groove (24) comprises a fourth magnetic steel groove first edge (241), a fourth magnetic steel groove second edge (242) and a fourth magnetic steel groove third edge (243), the fourth magnetic steel groove first edge (241) faces the second magnetic steel groove (22), the fourth magnetic steel groove second edge (242) is located on the radial inner side of the fourth magnetic steel groove first edge (241) and opposite to the fifth magnetic steel groove (25), and the fourth magnetic steel groove third edge (243) is opposite to the fourth magnetic steel groove first edge (241);

The fifth magnetic steel groove (25) comprises a fifth magnetic steel groove first edge (251) which is positioned at the radial outer end and is intersected with the central line (I), a fifth magnetic steel groove second edge (252) which is opposite to the third magnetic steel groove second edge (232), a fifth magnetic steel groove third edge (253) which is opposite to the fourth magnetic steel groove second edge (242) and a fifth magnetic steel groove fourth edge (254) which is positioned at the radial inner side and is intersected with the central line (I);

the first magnetic steel groove first edge (211) is connected with the first magnetic steel groove second edge (212), and the second magnetic steel groove first edge (221) is connected with the second magnetic steel groove second edge (222); the first magnetic steel groove second side (212) is connected with the first magnetic steel groove third side (213) through an arc section, and the second magnetic steel groove second side (222) is connected with the second magnetic steel groove third side (223) through an arc section;

the first side (231) of the third magnetic steel groove is connected with the second side (232) of the third magnetic steel groove through an arc line, and the first side (251) of the fifth magnetic steel groove is connected with the second side (252) of the fifth magnetic steel groove through an arc line; the third side (233) of the third magnetic steel groove is connected with the second side (232) of the third magnetic steel groove through an arc line, and the second side (252) of the fifth magnetic steel groove is connected with the fourth side (254) of the fifth magnetic steel groove through an arc line;

The first side (241) of the fourth magnetic steel groove is connected with the second side (242) of the fourth magnetic steel groove through an arc line, and the first side (251) of the fifth magnetic steel groove is connected with the third side (253) of the fifth magnetic steel groove through an arc line; the third side (243) of the fourth magnetic steel groove is connected with the second side (242) of the fourth magnetic steel groove through an arc line, and the third side (253) of the fifth magnetic steel groove is connected with the fourth side (254) of the fifth magnetic steel groove through an arc line.

10. The permanent magnet assisted synchronous reluctance machine rotor structure according to claim 9, wherein:

a connecting line between an intersection point of the first magnetic steel groove first side (211) and the first magnetic steel groove second side (212) and an intersection point of the second magnetic steel groove first side (221) and the second magnetic steel groove second side (222) and the central line (I) intersect at the Q1a;

the intersection point of the extension line of the second side (212) of the first magnetic steel groove and the extension line of the third side (213) of the first magnetic steel groove and the intersection point of the extension line of the second side (222) of the second magnetic steel groove and the extension line of the third side (223) of the second magnetic steel groove are intersected with the central line (I) at the Q1b;

a connecting line between an extension line of the first side (231) of the third magnetic steel groove and an extension line of the second side (232) of the third magnetic steel groove and an extension line of the first side (251) of the fifth magnetic steel groove and an extension line of the second side (252) of the fifth magnetic steel groove and a width central line of the second magnetism isolating bridge (Q2) are intersected at the Q2a; a connecting line between an extension line of the third magnetic steel groove third side (233) and an extension line of the third magnetic steel groove second side (232) and an extension line of the fifth magnetic steel groove second side (252) and an extension line of the fifth magnetic steel groove fourth side (254) and a width central line of the second magnetism isolating bridge (Q2) are intersected at the Q2b;

A connecting line between an extension line of the first side (241) of the fourth magnetic steel groove and an extension line of the second side (242) of the fourth magnetic steel groove and an extension line of the first side (251) of the fifth magnetic steel groove and an extension line of the third side (253) of the fifth magnetic steel groove and a width central line of the third magnetism isolating bridge (Q3) are intersected at the Q3a; and a connecting line between an extension line of the third side (243) of the fourth magnetic steel groove and an extension line of the second side (242) of the fourth magnetic steel groove and an intersection line between an extension line of the third side (253) of the fifth magnetic steel groove and an extension line of the fourth side (254) of the fifth magnetic steel groove and a width central line of the third magnetism isolating bridge (Q3) are intersected at the Q3b.

11. The permanent magnet assisted synchronous reluctance machine rotor structure according to claim 9, wherein:

aq=67.5 deg, the radius of all arc sections is 0.8-1.5mm, the first air groove (41) and the second air groove (42) are rectangular structures, the value range of the length L is 14-16mm, and the length direction is perpendicular to the width direction.

12. A permanent magnet auxiliary synchronous reluctance motor is characterized in that: a rotor structure comprising a permanent magnet assisted synchronous reluctance motor according to any one of claims 1 to 11.