CN219999130U - Rotor and motor - Google Patents

Abstract

The utility model relates to a rotor and an electric motor, the electric motor comprising: the rotor core is provided with a plurality of mounting grooves which are distributed at intervals along the circumferential direction, each mounting groove comprises a first groove part and a second groove part which are communicated with each other, the plurality of permanent magnets are arranged in the plurality of mounting grooves in a one-to-one correspondence mode, each permanent magnet comprises a first magnet part and a second magnet part, the first magnet part is matched in the first groove part, the second magnet part is matched in the second groove part, the second magnet part is connected to one side, facing the outer contour of the rotor core, of the first magnet part, and the width of the first magnet part is larger than that of the second magnet part. Therefore, the second magnet part is arranged, so that the ratio of the permanent magnet to the rotor core is high, the torque of the motor can be improved, the second magnet part is closer to the stator of the motor, the utilization rate of the second magnet part can be improved, the mechanical strength of the rotor core can be ensured, and the performance of the motor is optimized.

Description

Rotor and motor

Technical Field

The utility model relates to the technical field of motors, in particular to a rotor and a motor.

Background

In the related art, for example, the thickness of an air gap between stator and rotor of a motor of an embedded permanent magnet synchronous motor can be controlled in a small range, and the power density of the motor can be higher than that of a motor of a surface-mounted rotor. In-line permanent magnet synchronous motors, in order to reduce leakage rate and increase torque density, the width of the magnetic gap bridge of the permanent magnet slots is generally reduced as much as possible, which results in that the permanent magnets must be mounted near the outer periphery of the rotor core, but such an arrangement limits the permanent magnet's duty cycle in the rotor core. Therefore, how to improve the space utilization of the rotor is a problem to be solved.

Disclosure of Invention

The utility model provides a rotor and a motor, which are used for solving the problem of low utilization rate of the rotor.

In a first aspect, the present utility model provides a rotor.

In a second aspect, the utility model provides an electric machine comprising a rotor as described above.

According to the rotor of the embodiment of the utility model, the rotor comprises a rotor core and a plurality of permanent magnets, the rotor core is provided with a plurality of mounting grooves which are arranged at intervals along the circumferential direction, each mounting groove comprises a first groove part and a second groove part which are communicated with each other, the plurality of permanent magnets are arranged in the plurality of mounting grooves in a one-to-one correspondence manner, each permanent magnet comprises a first magnet part and a second magnet part, the first magnet part is matched in the first groove part, the second magnet part is matched in the second groove part, the second magnet part is connected to one side of the first magnet part, which faces the outer contour of the rotor core, and the width of the first magnet part is larger than that of the second magnet part.

Compared with the prior art, the technical scheme provided by the embodiment of the utility model has the following advantages:

according to the rotor provided by the embodiment of the utility model, the ratio of the permanent magnets in the rotor core is high, so that the torque of the motor can be improved, the second magnet part is closer to the stator of the motor, the utilization rate of the second magnet part can be improved, the mechanical strength of the rotor core can be ensured, and the performance of the motor can be optimized.

In some embodiments, the height of the first magnet portion is H1, the height of the permanent magnet is H2, the H1, H2 satisfying: H1/H2 is more than or equal to 0.5 and less than or equal to 0.99.

In some embodiments, the width of the permanent magnet is B1, the width of the second magnet portion is B2, the B1, B2 satisfying: B2/B1 is more than or equal to 0.3 and less than or equal to 0.7.

In some embodiments, 0.56.ltoreq.B2/B1.ltoreq.0.66.

In some embodiments, the first groove portion includes a first sidewall and a second sidewall opposite to each other in a width direction, the first sidewall and the second sidewall being distant from each other in a direction from the first groove portion to the second groove portion.

In some embodiments, the plurality of mounting slots includes adjacent first and second mounting slots, the second side wall of the first mounting slot being adjacent the first side wall of the second mounting slot, the second side wall of the first slot portion being parallel to the first side wall of the second slot portion.

In some embodiments, the mounting groove further includes a third groove portion communicating with the first groove portion, a portion of a side wall of the first groove portion remote from the second groove portion protruding toward the central axis of the rotor core to form the third groove portion.

In some embodiments, at least one side wall of the mounting groove remote from the central axis of the rotor core is spaced apart from the permanent magnet by a distance H3, the H3 satisfying: h3 is more than or equal to 0.05mm and less than or equal to 0.3mm.

In some embodiments, the second magnet portion comprises: the third side wall and the fourth side wall are oppositely arranged along the width direction, the fifth side wall is connected between the third side wall and the fourth side wall, and the cross section of the fifth side wall is in a straight line shape or an arc shape.

In some embodiments, the fifth side wall is in a circular arc shape, and the center of the circle where the circular arc is located is eccentric to the center of the rotor core.

In some embodiments, the third sidewall and the fourth sidewall are each arcuate in cross-section; or the third side wall and the fourth side wall are rectilinear in cross section, and the third side wall and the fourth side wall are distant from each other in a direction from the second magnet portion to the first magnet portion.

In some embodiments, the second groove portion is connected at a widthwise middle portion of the first groove portion.

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

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

FIG. 1 is a top view of a rotor according to an embodiment of the present utility model;

FIG. 2 is a top view of a portion of a rotor structure according to an embodiment of the present utility model;

FIG. 3 is a top view of a permanent magnet and mounting slots provided in one embodiment of the present utility model;

FIG. 4 is a top view of a permanent magnet and mounting slots provided in another embodiment of the present utility model;

FIG. 5 is a top view of a permanent magnet and mounting slot provided in accordance with yet another embodiment of the present utility model;

FIG. 6 is a top view of a permanent magnet and mounting slot provided in accordance with yet another embodiment of the present utility model;

FIG. 7 is a graph of B2/B1 ratio versus torque parameters provided by an embodiment of the present utility model;

FIG. 8 is a graph of B2/B1 ratio versus torque ripple parameter for an embodiment of the present utility model.

Reference numerals illustrate:

100. a rotor;

10. a rotor core; 11. a mounting groove; 111. a first groove portion; 111a, a first sidewall; 111b, a second sidewall; 112. a second groove portion; 113. a first mounting groove; 114. a second mounting groove; 115. a third groove portion;

20. a permanent magnet; 21. a first magnet portion; 22. a second magnet portion; 221. a third sidewall; 222. a fourth sidewall; 223. a fifth sidewall;

30. a rotating shaft.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. 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.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

For ease of description, spatially relative terms, such as "inner," "outer," "width," "height," "length," "lower," "upper," and the like, may be used herein to describe one element's or feature's relative positional relationship or movement with respect to another element's or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figure experiences a position flip or a change in attitude or a change in state of motion, then the indications of these directivities correspondingly change, for example: an element described as "under" or "beneath" another element or feature would then be oriented "over" or "above" the other element or feature. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

In order to solve the technical problems in the prior art, the utility model provides a rotor 100 which can improve the torque of a motor, has high utilization rate of permanent magnets 20 and has good mechanical strength of a rotor core 10.

A rotor 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 8, the rotor 100 including a rotor core 10 and a plurality of permanent magnets 20. The following description will be given by taking an example in which the rotor 100 is applied to a motor, but this is not a limitation.

Specifically, as shown in fig. 1 to 6, the rotor core 10 has a plurality of mounting grooves 11 arranged at intervals in the circumferential direction, the plurality of mounting grooves 11 may be arranged uniformly and at intervals in the circumferential direction of the rotor core 10, each mounting groove 11 includes a first groove portion 111 and a second groove portion 112 communicating with each other, the plurality of permanent magnets 20 are provided in the plurality of mounting grooves 11 in one-to-one correspondence, and the mounting grooves 11 may limit the permanent magnets 20. Each permanent magnet 20 includes a first magnet portion 21 and a second magnet portion 22, the second magnet portion 22 being connected to a side of the first magnet portion 21 facing the outer contour of the rotor core 10, that is, the second magnet portion 22 being connected to a side of the first magnet portion 21 facing away from the center axis of the rotor core 10. By providing the second magnet portion 22, the ratio of the permanent magnet 20 to the rotor core 10 can be increased, and thus the torque of the motor can be increased. Meanwhile, the second magnet portion 22 is connected to one side of the first magnet portion 21 facing the outer contour of the rotor core 10, and compared with the arrangement mode in which the first magnet portion is connected to one side of the first magnet portion facing away from the outer contour of the rotor core, which is a straight-line type permanent magnet or the second magnet portion is connected to one side of the first magnet portion facing away from the outer contour of the rotor core, the second magnet portion 22 of the embodiment of the present utility model can be closer to the stator of the motor, so that the magnetic field of the stator and the magnetic field of the permanent magnet 20 interact, thereby improving the torque of the motor, and the utilization rate of the permanent magnet 20 is high.

In addition, the width of the first magnet portion 21 is larger than the width of the second magnet portion 22, and thus the arrangement can prevent the cross-sectional area of the mounting groove 20 at the outer peripheral wall of the rotor core 10 from being excessively large to affect the structural strength of the rotor core 10, whereby by making the width of the first magnet portion 21 larger than the width of the second magnet portion 22, it is possible to advantageously ensure the mechanical strength of the rotor core 10 and to ensure the structural reliability of the rotor core 10. The first magnet portion 21 is fitted in the first groove portion 111, and the second magnet portion 22 is fitted in the second groove portion 112. For example, the inner side walls of the first groove portion 111 and the second groove portion 112 may be respectively adapted to at least a portion of the outer side surfaces of the first magnet portion 21 and the second magnet portion 22, so as to further improve the utilization ratio of the permanent magnet 20.

According to the rotor 100 of the embodiment of the present utility model, the ratio of the permanent magnet 20 in the rotor core 10 is high, so that the torque of the motor can be improved, the second magnet 22 is closer to the stator of the motor, the utilization rate of the second magnet 22 can be improved, the mechanical strength of the rotor core 10 can be ensured, and the motor performance can be optimized.

In some embodiments, as shown in FIGS. 3-6, the height of the first magnet portion 21 is H1 and the height of the permanent magnet 20 is H2, H1, H2 satisfying 0.5.ltoreq.H2.ltoreq.0.99. When h1/h2=0.5, the height of the first magnet portion 21 is the same as the height of the second magnet portion 22, and at this time, the second magnet portion 22 may be closer to the stator of the motor, so as to further facilitate improving the utilization rate of the permanent magnet 20. When h1/h2=0.99, the height of the first magnet portion is much greater than the height of the second magnet portion 22, and at this time, the second magnet portion 22 is further away from the outer contour of the rotor core 10, which may be more advantageous for ensuring high mechanical strength of the rotor core 10. For example, H1/h2=0.7, or H1/h2=0.8, the height ranges of the first magnet portion 21 and the permanent magnet 20 thus provided are reasonable, and the ratio of the second magnet portion 22 in the rotor core 10 and the high mechanical strength of the rotor core 10 can be compatible.

In some embodiments, as shown in fig. 3-6, the width of the permanent magnet 20 is B1, the width of the second magnet portion 22 is B2, B1, B2 satisfy: 0.3.ltoreq.B2/B1.ltoreq.0.7 to further give consideration to the ratio of the second magnet portion 22 in the rotor core 10 and the high mechanical strength of the rotor core 10.

Further, 0.56.ltoreq.B2/B1.ltoreq.0.66, e.g. B2/B1=0.6, or B2/B1=0.62. Experiments prove that the parameter range is reasonable, the torque of the motor can be increased, the torque pulsation of the motor can be reduced, the rotor core 10 is effectively utilized, the high utilization rate of the permanent magnet 20 can be ensured, and the problem that the torque pulsation of the motor of a built-in motor increases along with the increase of the use amount of the permanent magnet 20 is solved.

In some examples, as shown in fig. 2, the first groove portion 111 includes a first side wall 111a and a second side wall 111b opposite to each other in the width direction, the first side wall 111a and the second side wall 111b being distant from each other in a direction from the first groove portion 111 to the second groove portion 112. Thereby, the interval distance between the first side wall 111a, the second side wall 111b and the first magnet part 21 is larger to form an avoidance space, so that on one hand, the installation is convenient, and damage caused by scratch during the installation is prevented; on the other hand, the sinusoidal property of the air gap flux density can be improved, the magnetic leakage can be reduced, and the performance of the motor can be improved.

Further, as shown in fig. 1, the plurality of mounting grooves 11 includes adjacent first mounting grooves 11 and second mounting grooves 11, the second side wall 111b of the first groove portion 111 is adjacent to the first side wall 111a of the second groove portion 112, and the second side wall 111b of the first groove portion 111 is parallel to the first side wall 111a of the second groove portion 112, so as to further reduce magnetic leakage and further improve the performance of the motor.

In some embodiments, as shown in fig. 3, the mounting groove 11 further includes a third groove portion 115 communicating with the first groove portion 111, and a portion of a side wall of the first groove portion 111 remote from the second groove portion 112 protrudes toward the central axis of the rotor core 10 to form the third groove portion 115. For example, a middle portion of a side wall of the first slot portion 111, which is distant from the second slot portion 112, protrudes toward the center axis of the rotor core 10. By providing the third groove portion 115, it is possible to facilitate the separation of the permanent magnet 20 from the side of the mounting groove 11 facing the center of the rotor core 10, and the other portion of the side wall of the first groove portion 111 away from the second groove portion 112 may be disposed in contact with or spaced apart from the permanent magnet 20 by a small distance, so as to facilitate the reduction of the occupied space of the mounting groove 11 while improving the duty ratio of the permanent magnet 20.

In some embodiments, as shown in fig. 3 to 6, at least one side wall of the mounting groove 11 away from the central axis of the rotor core 10 is spaced apart from the permanent magnet 20 by a distance H3, and H3 satisfies: h3 is more than or equal to 0.05mm and less than or equal to 0.3mm. For example, h3=0.1 mm, or h3=0.2 mm. That is, one side wall of the mounting groove 11 away from the center axis of the rotor core 10 is spaced apart from the permanent magnets 20, while, for example, at least one side wall of the mounting groove 11 in the width direction may also be spaced apart from the permanent magnets 20. The interval distance that so set up sets up rationally, can be convenient for the installation of permanent magnet 20, and can be convenient for the permanent magnet 20 be connected with the bonding of the inner wall of mounting groove 11, can guarantee the thickness of adhesive linkage in order to do benefit to the bonding reliability that improves permanent magnet 20 and mounting groove 11, can reduce the magnetic leakage simultaneously.

In some embodiments, as shown in fig. 3 to 4, the second magnet portion 22 includes a third sidewall 221, a fourth sidewall 222, and a fifth sidewall 223, where the third sidewall 221 and the fourth sidewall 222 are disposed opposite to each other in the width direction, the fifth sidewall 223 is connected between the third sidewall 221 and the fourth sidewall 222, and a cross section of the fifth sidewall 223 is linear or arc-shaped, and both the above arrangements can increase the duty ratio of the permanent magnet 20 in the rotor core 10, increase the motor torque, and reduce the torque ripple. When the cross section of the fifth side wall 223 is arc-shaped, the middle portion of the fifth side wall 223 protrudes toward a direction away from the first magnet portion 21 to form the arc-shape described above. Of course, in other examples, the cross section of the fifth side wall 223 may have other shapes such as a wave shape, which is not limited herein.

Further, referring to fig. 4, the fifth side wall 223 is in a circular arc shape, and the center of the circle where the circular arc shape is located is eccentric to the center of the rotor core 10, and by using boolean operation, the sine of the air gap flux density can be improved, and the performance of the motor can be improved.

In some embodiments, as shown in fig. 5, the third sidewall 221 and the fourth sidewall 222 are each arcuate in cross-section. For example, in the example of fig. 5, the third sidewall 221 and the fourth sidewall 222 are each a circular arc segment of a quarter circle. In other embodiments, as shown in fig. 6, the cross sections of the third sidewall 221 and the fourth sidewall 222 are straight, and the third sidewall 221 and the fourth sidewall 222 are away from each other in the direction from the second magnet portion 22 to the first magnet portion 21, whereby the second magnet portion 22 can reduce the distance between the stator and the permanent magnet 20, the cross sectional area of the mounting groove 20 at the outer peripheral wall of the rotor core 10 can be further reduced, the utilization ratio of the permanent magnet 20 can be improved, the structural strength of the rotor core 10 can be further improved, the ratio of the permanent magnet 20 in the rotor core 10 can be improved, the torque of the motor can be improved, and the torque ripple can be reduced. It is to be understood that in the examples of fig. 5 and 6, the width B2 of the second magnet portion 22 refers to the width of the side of the second magnet portion 22 away from the center axis of the rotor core 10, not the maximum width of the second magnet portion 22.

As shown in fig. 3 to 6, the second groove portion 112 is connected to the middle portion of the first groove portion 111 in the width direction. Therefore, compared with the heights of the two sides in the width direction, the height of the middle part of the permanent magnet 20 is higher, the sine of the air gap flux density can be further improved, the running stability of the motor is improved, and the motor performance is optimized.

For example, the outer contour of the rotor core 10 may be cylindrical, and the mounting groove 11 penetrates the rotor core 10 in the axial direction of the rotor core 10 and is spaced apart from the outer circumferential wall of the rotor core 10. The mounting grooves 11 may be ten provided at intervals in the circumferential direction of the rotor core 10, but are not limited thereto. The rotor core 10 may be formed by laminating permanent magnet plates 20, and most of the rotor 100 is configured as a main magnetic circuit. The rotor 100 may include an even number of permanent magnets 20, e.g., 10. The permanent magnet 20 is fixed in the installation groove 11 by an adhesive and then magnetized by a magnetizing manner. Wherein, in some embodiments, the outer diameter r=51.4 mm of the rotor core 10, the height h1=1.9 mm of the first magnet portion 21, the width b1=12.8 mm of the permanent magnet 20, the height h2=2.9 mm of the permanent magnet 20, and the width B2 of the second magnet portion 22 may be specifically set according to practical situations, so as to ensure that torque of the motor can be lifted and reduce torque pulsation at the same time, wherein, the interval distance h3=0.1 mm between the permanent magnet 20 and the second slot portion 112, and the axial length l=37.45 mm of the rotor core 10, when the rotor 100 meets the above parameters, torque pulsation can be reduced, torque can be improved, sine of air gap density can be improved, power density of the motor can be improved, and stability of motor operation is high and performance is good.

Cogging torque is a main cause of torque ripple, and the following formula is a calculation formula of cogging torque of a motor:

wherein F is _n Represents magnetomotive force generated by the permanent magnet 20, br is residual magnetic density, alpha _p Is the polar arc coefficient.

Therefore, the distribution of the permanent magnetic field can be adjusted by arranging the second magnet part 22, so that the magnetic density in the air gap is improved, the waveform is more ideal, and the torque pulsation of the motor are optimized.

The parameter simulation of the permanent magnet 20 in the embodiment of the present utility model is performed as follows in conjunction with table 1.

TABLE 1

Referring to fig. 7, the remaining parameter values of the motor are unchanged, the width B2 of the second magnet portion 22 is changed, at this time, the ratio of B2/B1 is changed, the simulation calculation of the torque is performed for different ratios of B2/B1, and the curve result of the ratio torque of B2/B1 is shown in fig. 7. The ratio of B1 to B2 is controlled to be 0.3-0.2/B1-0.7 to give consideration to the ratio of the second magnet portion 22 in the rotor core 10 and the mechanical strength of the rotor core 10, and at this time, the width B2 of the second magnet portion 22 satisfies: b2 is more than or equal to 3.84mm and less than or equal to 8.96mm. Referring to the torque curve of fig. 7, as the value of B2/B1 increases, the torque curve of the motor tends to increase.

Referring to fig. 8, the torque ripple is calculated for different values of B2/B1 by changing the width B2 of the second magnet portion 22 and the ratio of B2/B1, with the values of the remaining parameters of the motor being kept unchanged, and the calculation result is shown in fig. 8. As can be seen from the torque ripple curve of fig. 8, as the value of B2/B1 increases, the torque ripple curve of the motor shows a curve that increases first, then decreases then increases. With continued reference to FIG. 8, it can be seen from the torque ripple plot of FIG. 8 that when 0.31.ltoreq.B2/B1.ltoreq.0.44, the torque ripple generally exhibits an increasing trend with increasing B2/B1 value; when B2/B1 is more than 0.44 and less than or equal to 0.63, the torque pulsation generally tends to decrease along with the increase of the value of B2/B1; when B2/B1 is more than 0.63 and less than or equal to 0.70, the torque pulsation generally shows an increasing trend along with the increase of the B2/B1 value; and when the B2/B1 value=0.63, the torque ripple reaches the minimum value of 1.00%.

From this, it can be found that the parameter range is reasonable when 0.56.ltoreq.B2/B1.ltoreq.0.66, the torque ripple is in the low value range, and at this time, the value range of the width B2 of the second magnet portion 22 is 7.2 mm.ltoreq.B2.ltoreq.8.5 mm. Through data analysis, the values of the rest parameters of the motor are kept unchanged, and the ratio of the second magnet part 22 to the permanent magnet 20 can be changed by changing the width B2 of the second magnet part 22, so that the torque pulsation of the motor can be reduced while the torque of the motor can be increased when the range of B2/B1 is reasonable, the rotor core 10 is effectively utilized, and the problem that the torque pulsation of the built-in motor is increased along with the increase of the use amount of the permanent magnet 20 is solved.

The motor according to the embodiment of the present utility model includes the rotor 100 of the above-described embodiment of the present utility model, whereby the duty ratio of the permanent magnets 20 in the rotor core 10 can be increased to increase the torque of the motor. Meanwhile, the second magnet part 22 can be closer to the stator of the motor, so that the magnetic field of the stator and the magnetic field of the permanent magnet 20 interact, the torque of the motor is improved, the utilization rate of the permanent magnet 20 is high, the mechanical strength of the rotor core 10 can be ensured, and the structural reliability of the rotor core 10 is ensured.

Other constructions, etc. and operation of the rotor 100, such as the shaft 30, according to the novel embodiment of the present utility model are known to those skilled in the art and will not be described in detail herein.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

The foregoing is only a specific embodiment of the utility model to enable those skilled in the art to understand or practice the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (13)

1. A rotor, comprising:

a rotor core having a plurality of mounting slots arranged at intervals in a circumferential direction, each of the mounting slots including a first slot portion and a second slot portion communicating with each other;

the permanent magnets are arranged in the mounting grooves in a one-to-one correspondence manner, each permanent magnet comprises a first magnet portion and a second magnet portion, the first magnet portion is matched in the first groove portion, the second magnet portion is matched in the second groove portion, the second magnet portion is connected to one side, facing the outer contour of the rotor core, of the first magnet portion, and the width of the first magnet portion is larger than that of the second magnet portion.

2. The rotor of claim 1, wherein the height of the first magnet portion is H1 and the height of the permanent magnet is H2, the H1, H2 satisfying:

0.5≤H1/H2≤0.99。

3. the rotor of claim 1, wherein the width of the permanent magnet is B1, the width of the second magnet portion is B2, the B1, B2 satisfying:

0.3≤B2/B1≤0.7。

4. a rotor according to claim 3, wherein 0.56.ltoreq.b2/b1.ltoreq.0.66.

5. The rotor of claim 1, wherein the first groove portion includes a first side wall and a second side wall opposite to each other in a width direction, the first side wall and the second side wall being distant from each other in a direction from the first groove portion to the second groove portion.

6. The rotor of claim 5, wherein the plurality of mounting slots includes adjacent first and second mounting slots, the second side wall of the first mounting slot being adjacent the first side wall of the second mounting slot, the second side wall of the first slot portion being parallel to the first side wall of the second slot portion.

7. The rotor of claim 1, wherein the mounting groove further includes a third groove portion communicating with the first groove portion, a portion of a side wall of the first groove portion remote from the second groove portion protruding toward a central axis of the rotor core to form the third groove portion.

8. The rotor of claim 1, wherein at least a side wall of the mounting groove remote from a central axis of the rotor core is spaced apart from the permanent magnets by a distance H3, the H3 satisfying: h3 is more than or equal to 0.05mm and less than or equal to 0.3mm.

9. The rotor of claim 1, wherein the second magnet portion comprises:

a third side wall and a fourth side wall, the third side wall and the fourth side wall being disposed opposite each other in a width direction;

and the fifth side wall is connected between the third side wall and the fourth side wall, and the cross section of the fifth side wall is in a straight line shape or an arc shape.

10. The rotor of claim 9, wherein the fifth side wall is circular arc-shaped and a center of a circle where the circular arc is located is eccentrically disposed with respect to a center of the rotor core.

11. The rotor of claim 9, wherein the third and fourth sidewalls are each arcuate in cross-section; or (b)

The third side wall and the fourth side wall are rectilinear in cross section, and the third side wall and the fourth side wall are distant from each other in a direction from the second magnet portion to the first magnet portion.

12. The rotor of claim 1, wherein the second groove portion is connected to a widthwise middle portion of the first groove portion.

13. An electric machine comprising a rotor according to any one of claims 1-12.