阅读说明：本技术 一种压缩机电机及其转子 (Compressor motor and rotor thereof ) 是由 汪圣原 张兴志 于 2020-04-23 设计创作，主要内容包括：本发明提供的转子和压缩机电机,其中所述转子具有多个沿轴向布置的磁铁槽,多个所述磁铁槽沿所述转子的周向均匀分布,每一所述磁铁槽均用于放置磁铁以形成所述转子的磁极；定义所述转子的轴心到所述磁铁槽的两端的连线的距离为D,所述转子的外轮廓的最大半径为R,则满足0.7≤D/R≤0.9；定义所述磁铁槽的厚度为Lm,所述转子与所述定子间最小气隙间距为La,则满足0.25≤La/Lm≤0.35。通过上述对磁铁槽的限定,使得所述磁铁槽的位置及厚度被限定在一定范围内,进而使得在磁铁槽内的磁铁处于最佳的工作点且磁性能达到最佳,还可以避免磁铁在高温下的退磁。因此,解决了永磁同步电机中磁铁没有发挥最佳性能和容易在高温下退磁的问题。(The invention provides a rotor and a compressor motor, wherein the rotor is provided with a plurality of magnet slots which are arranged along the axial direction, the plurality of magnet slots are uniformly distributed along the circumferential direction of the rotor, and each magnet slot is used for placing a magnet to form a magnetic pole of the rotor; defining the distance from the axis of the rotor to a connecting line of two ends of the magnet slot as D, and the maximum radius of the outer contour of the rotor as R, so that D/R is more than or equal to 0.7 and less than or equal to 0.9; the thickness of the magnet slot is defined to be Lm, and the minimum air gap distance between the rotor and the stator is La, so that La/Lm is more than or equal to 0.25 and less than or equal to 0.35. Through the limitation to the magnet slot, the position and the thickness of the magnet slot are limited within a certain range, so that the magnet in the magnet slot is positioned at the optimal working point, the magnetic performance is optimal, and the demagnetization of the magnet at high temperature can be avoided. Therefore, the problems that the magnet in the permanent magnet synchronous motor does not exert the optimal performance and is easy to demagnetize at high temperature are solved.)

1. A rotor for use with a stator, wherein the rotor has a plurality of axially disposed magnet slots uniformly distributed along a circumference of the rotor, each magnet slot for receiving a magnet to form a magnetic pole of the rotor;

defining the distance from the axis of the rotor to a connecting line of two ends of the magnet slot as D, and the maximum radius of the outer contour of the rotor as R, so that D/R is more than or equal to 0.7 and less than or equal to 0.9;

the thickness of the magnet slot is defined to be Lm, and the minimum air gap distance between the rotor and the stator is La, so that La/Lm is more than or equal to 0.25 and less than or equal to 0.35.

2. The rotor of claim 1 wherein the thickness Lm of the magnet slots is the maximum thickness of the magnet slots.

3. The rotor of claim 1 wherein said magnet slots have at least one cavity, each said cavity for receiving at least one said magnet.

4. The rotor of claim 3, wherein the magnet slot has two or more cavities, all of which are sequentially distributed in a width direction of the magnet slot.

5. The rotor of claim 1, wherein the magnet slots are symmetrical structures about a diameter of the rotor.

6. The rotor of claim 5, wherein the symmetrical structure is in the shape of a straight line.

7. The rotor as set forth in claim 5 wherein said symmetrical structure is concave toward the axial center of said rotor.

8. The rotor of claim 5, wherein the width of the symmetrical structure gradually decreases from an end away from the axial center of the rotor to an end close to the axial center of the rotor.

9. The rotor of claim 1, further comprising a plurality of axially arranged magnetic shield grooves, wherein each of the magnetic shield grooves is provided at both ends of one side of the magnet groove away from the axis of the rotor.

10. A compressor motor comprising a stator and a rotor according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of permanent magnet synchronous motors, in particular to a compressor motor and a rotor thereof.

Background

The household air conditioner compressor is in complete transition to the frequency conversion product, and the motor is used as a core component of the compressor, so that the requirement on efficiency is higher and higher. The permanent magnet synchronous motor has high performance and low cost, and is widely applied to household air conditioner compressors. Unlike other motors, the permanent magnets in a permanent magnet synchronous motor are the source of the magnetic field of the rotor, which drives the rotor to rotate with the magnetic field of the stator. Therefore, the related design of the magnets in the permanent magnet synchronous motor is very important. It is important to ensure that the magnet has the best performance and that the magnet is not easy to demagnetize at high temperature.

In the prior art, the related design of the magnet in the permanent magnet synchronous motor is not optimized, so that when the existing permanent magnet synchronous motor runs under a load, the magnet (permanent magnet) is not at the optimal working point, and the magnet does not exert the optimal performance. Meanwhile, due to the fact that the thickness of the magnet (permanent magnet) is not designed reasonably, the magnet is prone to demagnetization at high temperature. Specifically, the arrangement of the magnets in the rotor, especially the distance between the magnets and the center of the rotor, affects the magnetic performance of the magnets; under the action of a magnetic field generated by electrifying the stator winding, the magnet is easy to demagnetize at high temperature, and meanwhile, under the condition that the gap distance of the motor air gap is not changed, if the thickness of the magnet is thinner, the risk of demagnetization of the magnet is easy to cause at high temperature.

Disclosure of Invention

The invention aims to provide a compressor motor and a rotor thereof, which are used for solving the problems that magnets in a permanent magnet synchronous motor do not exert the optimal performance and are easy to demagnetize at high temperature.

In order to solve the technical problem, the present invention provides a rotor, which is used in cooperation with a stator, wherein the rotor has a plurality of magnet slots arranged along an axial direction, the plurality of magnet slots are uniformly distributed along a circumferential direction of the rotor, and each magnet slot is used for placing a magnet to form a magnetic pole of the rotor; defining the distance from the axis of the rotor to a connecting line of two ends of the magnet slot as D, and the maximum radius of the outer contour of the rotor as R, so that D/R is more than or equal to 0.7 and less than or equal to 0.9; the thickness of the magnet slot is defined to be Lm, and the minimum air gap distance between the rotor and the stator is La, so that La/Lm is more than or equal to 0.25 and less than or equal to 0.35.

Optionally, in the rotor, a thickness Lm of the magnet slot is a maximum thickness of the magnet slot.

Optionally, in the rotor, the magnet slot has at least one cavity, and each cavity is used for placing at least one magnet.

Optionally, in the rotor, the magnet slot has two or more cavities, and all the cavities are sequentially distributed along the width direction of the magnet slot.

Optionally, in the rotor, the magnet slots are symmetrical structures that are symmetrical about a diameter of the rotor.

Optionally, in the rotor, the symmetrical structure is in a straight shape.

Optionally, in the rotor, the symmetrical structure is concave towards the direction close to the axis of the rotor.

Optionally, in the rotor, the width of the symmetrical structure gradually decreases from one end away from the axial center of the rotor to one end close to the axial center of the rotor.

Optionally, in the rotor, the rotor further has a plurality of magnetic isolation grooves arranged along the axial direction, and both ends of one side of each magnet groove, which is far away from the axis of the rotor, are provided with the magnetic isolation grooves.

In order to solve the technical problem, the invention further provides a compressor motor, which comprises a stator and the rotor.

The invention provides a rotor and a compressor motor, wherein the rotor is provided with a plurality of magnet slots which are arranged along the axial direction, the plurality of magnet slots are uniformly distributed along the circumferential direction of the rotor, and each magnet slot is used for placing a magnet to form a magnetic pole of the rotor; defining the distance from the axis of the rotor to a connecting line of two ends of the magnet slot as D, and the maximum radius of the outer contour of the rotor as R, so that D/R is more than or equal to 0.7 and less than or equal to 0.9; the thickness of the magnet slot is defined to be Lm, and the minimum air gap distance between the rotor and the stator is La, so that La/Lm is more than or equal to 0.25 and less than or equal to 0.35. Through the above-mentioned limited to the magnet groove, make the position and the thickness foundation of magnet groove the maximum radius of the outline of rotor and with the stator between the air gap interval and be injectd in certain extent, and then make and place magnet in the magnet groove is in the best operating point and the magnetic property of magnet reaches the best, simultaneously, can also avoid the demagnetization of magnet under high temperature. Therefore, the problems that the magnet in the permanent magnet synchronous motor does not exert the optimal performance and is easy to demagnetize at high temperature are solved.

Drawings

Fig. 1 is a schematic structural view illustrating a rotor according to the present embodiment, in which magnet slots are in a straight line shape;

FIG. 2 is a partial enlarged view of the rotor and stator assembly provided in this embodiment;

FIG. 3 is a schematic view of an arrangement of two cavities in the magnet slot of this embodiment;

FIG. 4 is a schematic view of an arrangement of three cavities in the magnet slot of this embodiment;

FIG. 5 is a schematic view of an arrangement of four cavities in the magnet slot of this embodiment;

fig. 6 is a schematic structural view of the rotor according to the present embodiment, in which the magnet slots are V-shaped;

fig. 7 is a schematic structural view of the rotor provided in this embodiment, in which the magnet slots are isosceles triangles;

fig. 8 is a schematic structural view of the rotor according to the present embodiment, in which the magnet slots are arc-shaped;

fig. 9 is a schematic view of a matching structure of the rotor and the stator provided in this embodiment

Wherein the reference numerals are as follows:

10-a rotor; 110-magnet slots; 111-a cavity; 120-magnetism isolating groove; 20-stator.

Detailed Description

The compressor motor and its rotor according to the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

The present embodiment provides a rotor 10, configured to cooperate with a stator, as shown in fig. 1, where the rotor 10 has a plurality of magnet slots 110 arranged along an axial direction, the plurality of magnet slots 110 are uniformly distributed along a circumferential direction of the rotor 10, and each magnet slot 110 is used for placing a magnet to form a magnetic pole of the rotor 10; defining the distance from the axis of the rotor 10 to the connecting line of the two ends of the magnet slot 110 as D, and the maximum radius of the outer contour of the rotor 10 as R, so that D/R is more than or equal to 0.7 and less than or equal to 0.9; as shown in fig. 2, when the thickness of the magnet slot 110 is defined as Lm and the minimum air gap distance between the rotor 10 and the stator 20 is La, La/Lm/0.35 is satisfied to be 0.25 ≦ La.

It should be noted that, the example shown in fig. 1 is a case where the magnet slot 110 is in a straight shape in a radial cross section, in other embodiments, the magnet slot 110 may have other shapes, and when the magnet slot has other shapes, there may be a case where the thicknesses of the magnet slot are not uniform; of course, the thickness of the magnet slot 110 may not be absolutely uniform during actual machining. Therefore, the thickness Lm of the magnet slot 110 is the maximum thickness of the magnet slot 110.

Through the above-mentioned limiting conditions, the position and thickness of the magnet slot 110 are limited within a certain range according to the maximum radius of the outer contour of the rotor 10 and the gap distance between the rotor 10 and the stator 20, so that the magnet placed in the magnet slot 110 is at the optimal working point and the magnetic performance of the magnet is optimal, and simultaneously, the demagnetization of the magnet at high temperature can be avoided. Therefore, the problems that the magnet in the permanent magnet synchronous motor does not exert the optimal performance and is easy to demagnetize at high temperature are solved.

In addition, in the rotor provided in this embodiment, the magnet slot 110 has at least one cavity 111, and each cavity 111 is used for placing at least one magnet. When the magnet slot 110 has only one cavity 111, it can be understood that the cavity 111 is the magnet slot 110, and the magnet is placed in the magnet slot 110.

Of course, the magnet slot 110 may also have two or more than two cavities 111, and the arrangement of the cavities 111 may be arbitrary, for example, in this embodiment, when the magnet slot 110 has two or more than two cavities 111, all the cavities 111 are sequentially distributed along the width direction of the magnet slot 110, and fig. 3 to 5 respectively show the structural schematic diagrams when the magnet slot 110 is composed of two cavities 111, three cavities 111, and four cavities 111. Of course, the number of the cavities 111 is merely for illustration, and in practical applications, the number of the cavities 111 is not limited thereto. When the shape of the radial cross section of the magnet slot 110 is complex, the magnet slot 110 may be divided into a plurality of empty slots with simple shapes, such as rectangular empty slots, by the cavity 111. Thus, the magnet can be placed in the cavity 111 without additional processing, and the complexity of processing and mounting the magnet is reduced.

In the rotor provided in this embodiment, preferably, referring to fig. 1, the magnet slots 110 are symmetrical structures symmetrical about the diameter of the rotor 10, and the shape and size of all the magnet slots 110 are also consistent so as to keep the magnetic property of the rotor stable.

Further, in the rotor provided in this embodiment, the symmetrical structure may be in a straight shape. Specifically, the radial section of the rotor 10 is as shown in fig. 1, and the magnet slot 110 is in a straight shape along the radial section of the rotor 10, so that the straight shape has a simple structure, is convenient to manufacture, and has low cost. Meanwhile, the magnetism of the magnet is also favorably exerted.

Or, in the rotor provided in this embodiment, the symmetric structure is concave toward a direction close to the axial center of the rotor. For example, as shown in fig. 6, the magnet groove 110 has a V-shaped cross section along the radial direction of the rotor 10, and the opening of the V-shape is away from the axial center of the rotor 10. Of course, the magnet slot 110 may also be arc-shaped, and the opening of the arc-shape is away from the axis of the rotor 10. The magnet slots 110 are arranged in a symmetrical pattern that is concave toward the axial center of the rotor 10, so that the problem of magnet flying out and the like in the working state of the rotor 10 can be prevented, and the magnetic interference between the magnets in each magnetic pole can be reduced.

Still alternatively, in the rotor provided in this embodiment, a width of the symmetric structure gradually decreases from one end away from the axial center of the rotor to one end close to the axial center of the rotor. For example, as shown in fig. 7, a cross section of the magnet slot 110 in the radial direction of the rotor 10 is an isosceles triangle, and an opening of a vertex of the isosceles triangle is away from the axial center of the rotor 10. For another example, as shown in fig. 8, a cross section of the magnet slot 110 in the radial direction of the rotor 10 is an arc shape, and an opening of the arc shape is away from the axial center of the rotor 10. Of course, the shape of the magnet slot 110 may also be an isosceles trapezoid, etc. The magnet slot 110 is set to be a symmetrical figure with the width gradually reduced from one end far away from the axle center of the rotor to one end close to the axle center of the rotor, so that the magnet structure matched with the magnet slot 110 in the shape is simpler and is easy to process, and meanwhile, the width of one side of the magnet slot 110 close to the outer contour of the rotor 10 is larger than that of one side close to the axle center of the rotor 10, so that the magnetism of the magnet close to the outer side of the rotor 10 is larger, and the magnetic performance of the magnet is favorably realized.

Of course, besides the shapes of the magnet slots 110 exemplified above, in other embodiments, the magnet slots 110 may also have other shapes, such as M-shaped, diamond-shaped, and the like.

In addition, in the rotor provided in the present embodiment, the rotor 10 further has a plurality of magnetic isolation grooves 120 arranged along the axial direction, and as shown in fig. 1, both ends of one side of each magnet groove 110 away from the axis of the rotor 10 are provided with the magnetic isolation grooves 120.

Increase magnetism groove 120, can effectively improve and separate the magnetism effect, reduce the inboard magnetic leakage of rotor, promote the magnetic flux utilization ratio of rotor, promote motor performance.

Specifically, the magnetic isolation groove 120 may be configured as follows: two ends of each magnet slot 110 along the circumferential direction of the rotor 10 are communicated with two correspondingly arranged magnetism isolating slots 120; alternatively, two ends of each magnet slot 110 in the circumferential direction of the rotor 10 are spaced apart from two corresponding magnet-isolating slots 120; still alternatively, one of the magnetism isolating grooves 120 is disposed between two ends of the adjacent magnet grooves 110, and the magnetism isolating groove 120 may be spaced apart from the magnet groove 110, or may be communicated with two ends of the magnet groove 110. The above-mentioned arrangement of the magnetism isolating grooves 120 is only an example, and in other specific embodiments, other designs of the magnetism isolating grooves 120 may exist.

The embodiment also provides a compressor motor, which comprises a stator 20 and any one of the rotors 10, and fig. 9 shows a schematic view of a matching structure of the rotor 10 and the stator 20.

Since the rotor 10 of the present embodiment is adopted in the compressor motor of the present embodiment, the position and thickness of the magnet slot 110 of the rotor 10 are limited within a certain range according to the maximum radius of the outer contour of the rotor 10 and the air gap distance between the rotor and the stator 20 by the above-mentioned limitation of the magnet slot 110 of the rotor 10; at the same time, the thickness of the magnet slots 110 and the air gap spacing also limit the requirements for the inner diameter of the stator 20 used with the rotor 10. Therefore, when the compressor motor works, the magnet placed in the magnet slot 110 can be at the optimal working point and the magnetic performance of the magnet can be optimal, and simultaneously, the demagnetization of the magnet at high temperature can be avoided. Therefore, the problems that the magnet in the permanent magnet synchronous motor does not exert the optimal performance and is easy to demagnetize at high temperature are solved.

In the compressor motor provided in the present embodiment, the rotor 10 has a plurality of magnetic poles each of which is constituted by the magnet slot 110 and a magnet placed therein; the stator 20 has a plurality of slots.

The position of the magnet in the rotor 10 is in the best working point by defining the position of the magnet slot 110 in the rotor 10 and the requirement between the thickness of the magnet slot 110 and the minimum air gap length, so that the magnet can exert the best performance, and simultaneously, the demagnetization of the magnet at high temperature can be avoided. Therefore, the problems that the magnet in the permanent magnet synchronous motor does not exert the optimal performance and is easy to demagnetize at high temperature are solved.

In summary, the present embodiment provides a rotor and a compressor motor, wherein the rotor 10 has a plurality of magnet slots 110 arranged along an axial direction, the plurality of magnet slots 110 are uniformly distributed along a circumferential direction of the rotor 10, and each magnet slot 110 is used for placing a magnet to form a magnetic pole of the rotor 10; defining the distance from the axis of the rotor 10 to the connecting line of the two ends of the magnet slot 110 as D, and the maximum radius of the outer contour of the rotor 10 as R, so that D/R is more than or equal to 0.7 and less than or equal to 0.9; the thickness of the magnet slot 110 is defined to be Lm, and the minimum air gap distance between the rotor 10 and the stator 20 is La, so that La/Lm is greater than or equal to 0.25 and less than or equal to 0.35. Meanwhile, in the compressor motor, the inner diameter of the stator 20 can also be understood to satisfy 0.25. ltoreq. La/Lm. ltoreq.0.35 to some extent. The position of the magnet slot 110 in the rotor 10 and the requirement between the thickness of the magnet slot 110 and the minimum air gap length are defined, and the inner diameter of the stator 20 used in cooperation with the compressor motor is also defined to meet the requirement between the minimum air gap length, so that the position of the magnet in the rotor is in the best working point, the magnet further exerts the best performance, and simultaneously, the demagnetization of the magnet at high temperature can be avoided. Therefore, the problems that the magnet in the permanent magnet synchronous motor does not exert the optimal performance and is easy to demagnetize at high temperature are solved.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.