Magnetic steel structure, rotor structure and motor

Abstract

The present application relates to the technical field of motors, and discloses a magnetic steel structure, a rotor structure and a motor. The magnetic steel structure comprises a first magnetic steel section and a second magnetic steel section. The second magnetic steel section is connected to the end of the first magnetic steel section. The first magnetic steel section and the second magnetic steel section are each of a sinusoidal structure. In the present application, the first magnetic steel section and the second magnetic steel section are each of a sinusoidal structure, the magnetic field gathered at the edge of a magnetic steel is diluted, the harmonic magnetic field formed by flux density concentration is reduced, and the local flux density saturation degree is reduced, thereby reducing the vibration noise of the motor.

Description

Magnetic steel structure, rotor structure and motor

[0001] This application is based on the Chinese patent application with application number 202410016033.9 and application date January 4, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0002] The present application relates to the field of motor technology, for example, to a magnetic steel structure, a rotor structure and a motor. Background Art

[0003] At present, compressor noise is the main problem of compressor products, and motor noise is one of the main noise sources of compressor noise.

[0004] In order to optimize the air gap magnetic field, reduce back electromotive force harmonics and reduce noise, the traditional solution is to assemble different blocks of magnetic steel into a whole or open auxiliary slots on the rotor core magnetic steel to optimize the magnetic line arrangement, improve the utilization rate of the fundamental magnetic field and reduce the proportion of harmonic magnetic field.

[0005] However, as the air-conditioning system's requirements for compressor efficiency continue to increase, the requirements for motor output under the same current are also increasing. It is difficult to further reduce the proportion of motor harmonic magnetic fields simply by opening auxiliary slots.

[0006] In the related art, in the motor of the air-conditioning compressor, the rotor magnet is mostly rectangular or semicircular.

[0007] During the implementation of the embodiments of the present disclosure, it was found that at least the following problems exist in the related art:

[0008] In related technologies, the rotor core magnets are rectangular or semicircular in shape. When the motor outputs torque, the magnetic flux density at the edges of the magnets is not utilized, resulting in wasted permanent magnets and local magnetic saturation, which in turn increases harmonic magnetic fields and motor vibration and noise.

[0009] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field.

[0010] Summary of the Invention

[0011] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0012] The embodiments of the present disclosure provide a magnetic steel structure, a rotor structure and a motor, which can dilute the magnetic field gathered at the edge of the magnetic steel, reduce the formation of harmonic magnetic fields in the magnetic density, reduce the local magnetic density saturation, and thus reduce the vibration noise of the motor.

[0013] In some embodiments, the present disclosure provides a magnetic steel structure, comprising: a first magnetic steel segment; a second magnetic steel segment, the second magnetic steel segment being connected to the end of the first magnetic steel segment; wherein the first magnetic steel segment and the second magnetic steel segment are both sinusoidal structures.

[0014] Optionally, the first magnetic steel segment and the second magnetic steel segment are connected by splicing to form a magnetic steel structure.

[0015] Optionally, the first magnetic steel segment and the second magnetic steel segment are an integrated structure to form an integrated magnetic steel structure.

[0016] Optionally, the first magnetic steel segment and the second magnetic steel segment are symmetrically arranged relative to their connecting end faces; the first magnetic steel segment includes a first peak segment and a first trough segment connected to the end of the first peak segment; the second magnetic steel segment includes a second peak segment and a second trough segment connected to the end of the second peak segment; along the direction from the first magnetic steel segment to the second magnetic steel segment, the first peak segment and the first trough segment are arranged in sequence, and the second trough segment and the second peak segment are arranged in sequence.

[0017] Optionally, the first wave crest section and the first wave trough section are an integrated structure to form an integral first magnetic steel section.

[0018] Optionally, the second wave valley section and the second wave peak section are an integrated structure to form an integral second magnetic steel section.

[0019] Optionally, the number of the first wave peak segments and the first wave trough segments are both one or more; when the number of the first wave peak segments and the first wave trough segments are both multiple, multiple first wave peak segments and multiple first wave trough segments are alternately arranged; the number of the second wave peak segments and the second wave trough segments are both one or more; when the number of the second wave peak segments and the second wave trough segments are both multiple, multiple second wave peak segments and multiple second wave trough segments are alternately arranged.

[0020] Optionally, the shortest distance H1 between the peak point of the first peak segment and the straight line connecting the end of the first magnetic steel segment, and the straight line length L1 of the first magnetic steel segment, satisfy: H1≤0.3·L1; the shortest distance H2 between the peak point of the second peak segment and the straight line connecting the end of the second magnetic steel segment, and the straight line length L2 of the second magnetic steel segment, satisfy: H2≤0.3·L2.

[0021] Optionally, relative to the magnetization direction of the first magnetic steel segment at the starting position of magnetic steel magnetization, the magnetization direction of the first magnetic steel segment varies sinusoidally with different magnetic steel magnetization positions; relative to the magnetization direction of the second magnetic steel segment at the starting position of magnetic steel magnetization, the magnetization direction of the second magnetic steel segment varies sinusoidally with different magnetic steel magnetization positions.

[0022] Optionally, at the starting position of magnetizing the magnetic steel of the first magnetic steel segment, the magnetizing direction is perpendicular to a straight line connecting the beginning and the end of the first magnetic steel segment.

[0023] Optionally, at the starting position of magnetization of the second magnetic steel segment, the magnetization direction is perpendicular to a straight line connecting the beginning and the end of the second magnetic steel segment.

[0024] Optionally, on the first magnetic steel segment and the second magnetic steel segment, the magnetization direction of each magnetic steel magnetization position relative to the magnetization direction of the magnetic steel magnetization starting position is a magnetization offset angle of satisfy:

[0025] Where, is the initial magnetization offset angle on the first magnetic steel segment or the initial magnetization offset angle on the second magnetic steel segment; L is the straight length of the first magnetic steel segment or the straight length of the second magnetic steel segment; x is the distance between the magnetization position and the starting position of magnetization on the first magnetic steel segment or the distance between the magnetization position and the starting position of magnetization on the second magnetic steel segment.

[0026] Optionally, the initial magnetization offset angle on the first magnetic steel segment is The value range is: 30° to 60°.

[0027] Optionally, the magnetization starting position of the first magnetic steel segment is located in the middle of the first magnetic steel segment. The distance x1 between the magnetization position on the first magnetic steel segment and the magnetization starting position is in the range of to At the magnet magnetization starting position of the first magnet segment, x1=0.

[0028] Optionally, the initial magnetization offset angle on the second magnetic steel segment is The value range is: 30° to 60°.

[0029] Optionally, the magnetization starting position of the second magnetic steel segment is located in the middle of the second magnetic steel segment. The distance x2 between the magnetization position of the second magnetic steel segment and the magnetization starting position is in the range of to At the magnet magnetization starting position of the second magnetic steel segment, x2=0.

[0030] Optionally, the magnetization directions of the first magnetic steel segment and the second magnetic steel segment are both positive to the magnetic pole direction; the magnetization directions of all magnetic steel magnetization positions on the first magnetic steel segment are parallel; the magnetization directions of all magnetic steel magnetization positions on the second magnetic steel segment are parallel.

[0031] In some embodiments, a rotor structure is provided, comprising: a rotor core having magnetic steel slots; and a magnetic steel structure as in any of the previous embodiments, the magnetic steel structure being disposed in the magnetic steel slots.

[0032] Optionally, the rotor core is provided with a plurality of magnetic steel slots along the circumferential direction, and the plurality of magnetic steel structures are placed in the plurality of magnetic steel slots in a one-to-one correspondence.

[0033] Optionally, the rotor core is formed by stacking a plurality of punching sheets with magnetic steel slots.

[0034] Optionally, the rotor core is further provided with auxiliary slots to reduce magnetic leakage.

[0035] Optionally, the straight length of the first magnetic steel segment and the straight length of the second magnetic steel segment both satisfy:

[0036] Wherein, R is the radius of the rotor core; p is the number of pole pairs; and L is the straight length of the first magnetic steel segment or the straight length of the second magnetic steel segment.

[0037] Optionally, the radius R of the rotor core ranges from 48 mm to 60 mm.

[0038] In some embodiments, the present disclosure provides a motor, comprising: a rotor structure as described in any of the preceding embodiments.

[0039] The magnetic steel structure, rotor structure, and motor provided by the embodiments of the present disclosure can achieve the following technical effects:

[0040] The magnetic steel structure provided in the embodiment of the present disclosure dilutes the magnetic field gathered at the edge of the magnetic steel by making the first magnetic steel segment and the second magnetic steel segment both have a sinusoidal structure, reduces the formation of harmonic magnetic fields in the magnetic flux density, reduces the local magnetic flux density saturation, and thus reduces the vibration noise of the motor.

[0041] When the magnetic steel structure is applied to the motor, the first magnetic steel segment and the second magnetic steel segment are both sinusoidal structures, which optimizes and reduces the harmonic magnetic field in the rotating magnetic field of the motor, reduces the peak value of the harmonic magnetic field during the motor rotation process, and thus reduces the vibration noise caused by the motor.

[0042] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0044] FIG1 is a schematic structural diagram of a rotor structure provided by an embodiment of the present disclosure;

[0045] FIG2 is a schematic diagram of a partial structure of a rotor structure provided by the embodiment shown in FIG1 ;

[0046] Figure 3 is an enlarged view of point A in Figure 2;

[0047] Figure 4 is an enlarged view of point B in Figure 2;

[0048] FIG5 is a first schematic diagram of the magnetization direction of a magnetic steel structure provided by one embodiment of the present disclosure;

[0049] FIG6 is a second schematic diagram of the magnetization direction of a magnetic steel structure provided by one embodiment of the present disclosure;

[0050] FIG7 is a schematic diagram of the magnetization direction of a magnetic steel structure provided by another embodiment of the present disclosure;

[0051] FIG8 is a back electromotive force curve diagram of a motor having a magnetic steel structure of the present application and a motor having rectangular magnetic steel;

[0052] FIG9 is a back-EMF harmonic amplitude curve diagram obtained by Fourier transforming the back-EMF curve diagram in FIG8 ;

[0053] FIG10 is a graph showing output torque curves of a motor having the magnetic steel structure of the present application and a motor having rectangular magnetic steel.

[0054] Reference numerals: 100: magnetic steel structure; 101: first magnetic steel segment; 1011: first wave crest segment; 1012: first wave trough segment; 102: second magnetic steel segment; 1021: second wave crest segment; 1022: second wave trough segment; 200: rotor structure; 201: rotor core; 202: magnetic steel slot. DETAILED DESCRIPTION

[0055] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0056] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0057] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to having a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0058] Furthermore, the terms "disposed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal connection between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this disclosure based on the specific circumstances.

[0059] Unless otherwise stated, the term "plurality" means two or more.

[0060] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0061] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0062] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0063] 1 to 10 , an embodiment of the present disclosure provides a magnetic steel structure 100. The magnetic steel structure 100 includes a first magnetic steel segment 101 and a second magnetic steel segment 102. The second magnetic steel segment 102 is connected to the end of the first magnetic steel segment 101. Both the first magnetic steel segment 101 and the second magnetic steel segment 102 have a sinusoidal structure.

[0064] In the disclosed embodiment, the magnetic steel structure 100 includes a first magnetic steel segment 101 and a second magnetic steel segment 102. Since both the first magnetic steel segment 101 and the second magnetic steel segment 102 have a sinusoidal structure, the originally concentrated local magnetic field (for example, the magnetic field concentrated at the edge of the magnetic steel) is diluted, reducing the formation of harmonic magnetic fields in the magnetic field density and lowering the degree of local magnetic field saturation, thereby reducing the vibration and noise of the motor.

[0065] In the embodiment of the present disclosure, when the magnetic steel structure 100 is applied to a motor, the first magnetic steel segment 101 and the second magnetic steel segment 102 are both sinusoidal structures, so that the harmonic magnetic field in the rotating magnetic field of the motor is optimized and reduced, so that the peak value of the harmonic magnetic field during the rotation process of the motor is reduced, thereby reducing the vibration noise caused by the motor.

[0066] Optionally, the first magnetic steel segment 101 and the second magnetic steel segment 102 are connected by splicing to form the magnetic steel structure 100 .

[0067] Optionally, the magnetic steel structure 100 is a periodic sinusoidal curve segment structure.

[0068] Optionally, the magnetic steel structure 100 is a sinusoidal curve segment structure with a cycle from a crest to a trough and then to a crest.

[0069] As shown in combination with FIG. 1 and FIG. 2 , optionally, the first magnetic steel segment 101 and the second magnetic steel segment 102 are an integrated structure to form an integrated magnetic steel structure 100 .

[0070] For example, in combination with FIG8 and FIG9 , a motor having the magnetic steel structure 100 of the present application and a motor having conventional rectangular magnetic steel are taken as examples to illustrate the good effect of the magnetic steel structure 100 of the present application in applying to the motor.

[0071] Through motor finite element simulation analysis, the back EMF curve of the motor with the magnetic steel structure 100 of the present application is shown in the solid line curve in Figure 8 (i.e., the sinusoidal magnetic steel back EMF curve in Figure 8). The back EMF curve of the motor with conventional rectangular magnetic steel is shown in the dashed line curve in Figure 8 (i.e., the conventional rectangular magnetic steel back EMF curve in Figure 8). By comparison, it can be found that the back EMF curve of the motor with the magnetic steel structure 100 of the present application is smoother and closer to a sine curve. The back EMF curve of the motor with conventional rectangular magnetic steel fluctuates greatly.

[0072] A Fourier transform of the back-EMF curve in FIG8 yields the back-EMF harmonic amplitude curve shown in FIG9 . The back-EMF harmonic amplitude curve of a motor having the magnetic steel structure 100 of the present application is shown as the solid line curve in FIG9 (i.e., the back-EMF harmonic amplitude curve for a sinusoidal magnetic steel in FIG9 ). The back-EMF harmonic amplitude curve of a motor having conventional rectangular magnetic steel is shown as the dashed line curve in FIG9 (i.e., the back-EMF harmonic amplitude curve for a conventional rectangular magnetic steel in FIG9 ).

[0073] By comparison, it can be found that, at the same frequency, the back-EMF harmonic amplitude of the motor with conventional rectangular magnetic steel is higher than that of the motor with the magnetic steel structure 100 of the present application. Compared to the position where the back-EMF harmonic amplitude of the motor with conventional rectangular magnetic steel is the highest, the back-EMF harmonic amplitude of the motor with the magnetic steel structure 100 of the present application is reduced by 70% to 80%, for example, by 76%.

[0074] It can be seen that the magnetic steel structure 100 of the present application can reduce the degree of local magnetic flux saturation, comprehensively reducing back EMF harmonics and pulsating torque, thereby reducing the vibration and noise of the motor. In other words, the magnetic steel structure 100, composed of the first magnetic steel segment 101 with a sinusoidal structure and the second magnetic steel segment 102 with a sinusoidal structure, can modulate the rotor and air gap magnetic fields, dilute the originally concentrated local magnetic field (for example, the magnetic field concentrated at the edge of the magnetic steel), and reduce the formation of harmonic magnetic fields in the magnetic flux density.

[0075] As shown in conjunction with Figures 1, 2, and 5 to 7, in some embodiments, the first magnetic steel segment 101 and the second magnetic steel segment 102 are symmetrically arranged relative to their connecting end faces. The first magnetic steel segment 101 includes a first peak segment 1011 and a first trough segment 1012 connected to the end of the first peak segment 1011. The second magnetic steel segment 102 includes a second peak segment 1021 and a second trough segment 1022 connected to the end of the second peak segment 1021. Along the direction from the first magnetic steel segment 101 to the second magnetic steel segment 102, the first peak segment 1011 and the first trough segment 1012 are arranged in sequence, and the second trough segment 1022 and the second peak segment 1021 are arranged in sequence.

[0076] In this embodiment, by symmetrically arranging the first magnetic steel segment 101 and the second magnetic steel segment 102 relative to the connecting end surface of the first magnetic steel segment 101 and the second magnetic steel segment 102, it is possible to dilute the originally concentrated local magnetic field (for example, the magnetic field concentrated at the edge of the magnetic steel), reduce the formation of harmonic magnetic fields in the magnetic field concentration, and thus reduce the vibration noise of the motor.

[0077] In this embodiment, along the direction from the first magnetic steel segment 101 to the second magnetic steel segment 102, the first peak segment 1011 and the first trough segment 1012 are arranged in sequence, and the second trough segment 1022 and the second peak segment 1021 are arranged in sequence, so as to achieve symmetrical arrangement of the first magnetic steel segment 101 and the second magnetic steel segment 102 relative to the connecting end surface of the first magnetic steel segment 101 and the second magnetic steel segment 102.

[0078] Optionally, the first wave crest section 1011 and the first wave trough section 1012 are integrated into a structure to form an integrated first magnetic steel section 101 , so that the first magnetic steel section 101 has a sinusoidal structure.

[0079] Optionally, the second trough section 1022 and the second peak section 1021 are integrated into a structure to form an integrated second magnetic steel section 102 , so that the second magnetic steel section 102 has a sinusoidal structure.

[0080] In some embodiments, the number of the first wave crest segment 1011 and the number of the first wave trough segment 1012 are both one, and the number of the second wave crest segment 1021 and the number of the second wave trough segment 1022 are both one.

[0081] 1 , 2 , and 5 to 7 , in this embodiment, when the number of the first peak segment 1011 and the first trough segment 1012 are both one, and the number of the second peak segment 1021 and the second trough segment 1022 are both one, the magnetic steel structure 100 includes two peak and trough structures, which can optimize the air gap magnetic field, reduce the formation of harmonic magnetic fields in the magnetic field density, reduce back electromotive force harmonics, and reduce the degree of local magnetic field saturation.

[0082] In some embodiments, the number of first wave crest sections 1011 and first wave trough sections 1012 are both plural, and the plurality of first wave crest sections 1011 and the plurality of first wave trough sections 1012 are alternately arranged. The number of second wave crest sections 1021 and the second wave trough sections 1022 are both plural, and the plurality of second wave crest sections 1021 and the plurality of second wave trough sections 1022 are alternately arranged.

[0083] In this embodiment, by having multiple first peak sections 1011 and multiple first trough sections 1012, and alternating the multiple first peak sections 1011 and multiple first trough sections 1012; and having multiple second peak sections 1021 and multiple second trough sections 1022, and alternating the multiple second peak sections 1021 and multiple second trough sections 1022, it is possible to achieve the magnetic steel structure 100 including multiple peak and trough structures, thereby optimizing the air gap magnetic field, reducing the formation of harmonic magnetic fields in the magnetic field density, reducing back electromotive force harmonics, and reducing the degree of local magnetic field saturation.

[0084] As shown in FIG2 , in some embodiments, the distance H1 between the peak point of the first wave peak segment 1011 and the straight line connecting the end of the first magnetic steel segment 101 (e.g., the dashed line on the first magnetic steel segment 101 in FIG2 ), together with the straight line length L1 of the first magnetic steel segment 101, satisfies the following: H1 ≤ 30%·L1. The distance H2 between the peak point of the second wave peak segment 1021 and the straight line connecting the end of the second magnetic steel segment 102 (e.g., the dashed line on the second magnetic steel segment 102 in FIG2 ), together with the straight line length L2 of the second magnetic steel segment 102, satisfies the following: H2 ≤ 30%·L2.

[0085] In this embodiment, the shortest distance H1 between the peak point of the first wave peak segment 1011 and the straight line connecting the end of the first magnetic steel segment 101 is the maximum distance between the first wave peak segment 1011 and the straight line connecting the end of the first magnetic steel segment 101 in a direction perpendicular to the straight line connecting the end of the first magnetic steel segment 101. The relationship between the shortest distance H1 between the peak point of the first wave peak segment 1011 and the straight line connecting the end of the first magnetic steel segment 101 and the straight line length L1 of the first magnetic steel segment 101 satisfies the following: H1 ≤ 0.3·L1, thereby optimizing the air gap magnetic field and reducing back EMF harmonics.

[0086] In this embodiment, the shortest distance H2 between the peak point of the second wave peak segment 1021 and the straight line connecting the end and end of the second magnetic steel segment 102 is the maximum distance between the second wave peak segment 1021 and the straight line connecting the end and end of the second magnetic steel segment 102 in a direction perpendicular to the straight line connecting the end and end of the second magnetic steel segment 102. The relationship between the shortest distance H2 between the peak point of the second wave peak segment 1021 and the straight line connecting the end and end of the second magnetic steel segment 102 and the straight line length L2 of the second magnetic steel segment 102 satisfies the following: H2 ≤ 0.3·L2. This optimizes the air gap magnetic field and reduces back EMF harmonics.

[0087] As shown in conjunction with Figures 2 to 6 , in some embodiments, relative to the magnetization direction of the first magnetic steel segment 101 at the starting magnetization position O1 (indicated by the arrow at O1 in Figures 5 and 6 ), the magnetization direction of the first magnetic steel segment 101 (indicated by the arrow on the first magnetic steel segment 101 in Figures 5 and 6 ) varies sinusoidally with different magnetization positions. Relative to the magnetization direction of the second magnetic steel segment 102 at the starting magnetization position O2 (indicated by the arrow at O2 in Figures 5 and 6 ), the magnetization direction of the second magnetic steel segment 102 (indicated by the arrow on the second magnetic steel segment 102 in Figures 5 and 6 ) varies sinusoidally with different magnetization positions.

[0088] In this embodiment, relative to the magnetization direction of the first magnetic steel segment 101 at the magnetization starting position O1, the magnetization direction of the first magnetic steel segment 101 varies sinusoidally with different magnetization positions. Specifically, the sinusoidal variation is a sinusoidally distributed angular deviation along the waveband direction of the first magnetic steel segment 101, thereby diluting the originally concentrated local magnetic field and reducing the formation of harmonic magnetic fields in the magnetic field concentration.

[0089] In this embodiment, relative to the magnetization direction at the magnetization starting position O2 of the second magnetic steel segment 102, the magnetization direction of the second magnetic steel segment 102 varies sinusoidally with different magnetization positions. Specifically, the sinusoidal variation is a sinusoidally distributed angular deviation along the waveband direction of the second magnetic steel segment 102, thereby diluting the originally concentrated local magnetic field and reducing the formation of harmonic magnetic fields in the magnetic field concentration.

[0090] As shown in conjunction with FIG5 and FIG6 , optionally, the magnetization direction at the magnetization starting position O1 of the first magnetic steel segment 101 is perpendicular to the straight line connecting the head and tail of the first magnetic steel segment 101. That is, the angle between the magnetization direction at the magnetization starting position O1 of the first magnetic steel segment 101 and the straight line connecting the head and tail of the first magnetic steel segment 101 is 90°.

[0091] As shown in conjunction with FIG5 and FIG6 , optionally, at the magnetization starting position O2 of the second magnetic steel segment 102, the magnetization direction is perpendicular to the straight line connecting the head and tail of the second magnetic steel segment 102. That is, the angle between the magnetization direction at the magnetization starting position O2 of the second magnetic steel segment 102 and the straight line connecting the head and tail of the second magnetic steel segment 102 is 90°.

[0092] Optionally, on the first magnetic steel segment 101 and the second magnetic steel segment 102, the magnetization direction of each magnetic steel magnetization position relative to the magnetization direction of the magnetic steel magnetization starting position is a magnetization offset angle of satisfy:

[0093] Where, is the initial magnetization offset angle on the first magnetic steel segment 101 Or the initial magnetization offset angle on the second magnetic steel segment 102 L is the straight length L1 of the first magnetic steel segment or the straight length L2 of the second magnetic steel segment; x is the distance x1 between the magnetizing position on the first magnetic steel segment 101 and the magnetizing starting position O1 or the distance x2 between the magnetizing position on the second magnetic steel segment 102 and the magnetizing starting position O2.

[0094] The straight length L1 of the first magnetic steel segment and the straight length L2 of the second magnetic steel segment both satisfy:

[0095] Wherein, R is the radius of the rotor core; p is the number of pole pairs; and L is the straight length L1 of the first magnetic steel segment or the straight length L2 of the second magnetic steel segment.

[0096] 2 to 6 , in some embodiments, on the first magnetic steel segment 101, the magnetization direction of each magnetic steel magnetization position relative to the magnetization direction of the magnetic steel magnetization starting position O1 is offset by an angle of satisfy:

[0097] Where, is the initial magnetization offset angle on the first magnetic steel segment 101. L1 is the straight length of the first magnetic steel segment 101. x1 is the distance between the magnetic steel magnetization position on the first magnetic steel segment 101 and the magnetic steel magnetization starting position O1.

[0098] In this embodiment, on the first magnetic steel segment 101, the magnetization direction of each magnetic steel magnetization position is relative to the magnetization direction of the magnetic steel magnetization starting position O1 by the magnetization offset angle. satisfy: The magnetization direction presents a sinusoidal angular deviation along the band direction of the first magnetic steel segment 101, thereby achieving a magnetization direction relative to the magnetization starting position O1 of the first magnetic steel segment 101. The magnetization direction of the first magnetic steel segment 101 changes sinusoidally with different magnetization positions of the magnetic steel, thereby diluting the originally concentrated local magnetic field and reducing the formation of harmonic magnetic fields in the magnetic field concentration.

[0099] Optionally, the initial magnetization offset angle on the first magnetic steel segment 101 is The value range is: 30° to 60°.

[0100] In this embodiment, by adjusting the initial magnetization offset angle of the first magnetic steel segment 101 It is possible to adjust the magnetization direction of the magnet magnetization position relative to the magnetization direction of the magnet magnetization starting position O1 to achieve the magnetization offset angle This is to dilute the originally concentrated local magnetic field and reduce the formation of harmonic magnetic fields in the magnetic field density.

[0101] As shown in FIG5 and FIG6, optionally, the magnetizing starting position O1 of the first magnetic steel segment 101 is located in the middle of the first magnetic steel segment 101. The value range of the distance x1 between the magnetizing position on the first magnetic steel segment 101 and the magnetizing starting position O1 is to At the magnet magnetization starting position O1 of the first magnetic steel segment 101 , x1=0.

[0102] In this embodiment, the magnetization starting position O1 of the first magnetic steel segment 101 is located in the middle of the first magnetic steel segment 101, so as to achieve a magnetic concentration effect in the middle of the first magnetic steel segment 101, thereby diluting the originally concentrated local magnetic field.

[0103] 2 to 6 , in some embodiments, on the second magnetic steel segment 102 , the magnetization direction of each magnetic steel magnetization position relative to the magnetization direction of the magnetic steel magnetization starting position O2 is offset by an angle of satisfy:

[0104] Where, is the initial magnetization offset angle on the second magnetic steel segment 102. L2 is the straight length of the second magnetic steel segment 102. x2 is the distance between the magnetic steel magnetization position on the second magnetic steel segment 102 and the magnetic steel magnetization starting position O2.

[0105] In this embodiment, on the second magnetic steel segment 102, the magnetization direction of each magnetic steel magnetization position is relative to the magnetization direction of the magnetic steel magnetization starting position O2 by the magnetization offset angle. satisfy The magnetization direction presents a sinusoidal angular deviation along the waveband direction of the second magnetic steel segment, thereby realizing that the magnetization direction of the second magnetic steel segment 102 relative to the magnetization starting position O2 of the second magnetic steel segment 102 changes sinusoidally with the different magnetization positions of the magnetic steel, thereby diluting the originally concentrated local magnetic field and reducing the formation of harmonic magnetic fields in the magnetic field concentration.

[0106] Optionally, the initial magnetization offset angle on the second magnetic steel segment 102 is The value range is: 30° to 60°.

[0107] In this embodiment, by adjusting the initial magnetization offset angle of the second magnetic steel segment 102 It is possible to adjust the magnetization direction of the magnetization position relative to the magnetization direction of the magnetization starting position O2 to achieve the magnetization offset angle This is to dilute the originally concentrated local magnetic field and reduce the formation of harmonic magnetic fields in the magnetic field density.

[0108] As shown in FIG5 and FIG6, optionally, the magnetizing starting position O2 of the second magnetic steel segment 102 is located in the middle of the second magnetic steel segment 102. The distance x2 between the magnetizing position on the second magnetic steel segment 102 and the magnetizing starting position O2 is in the range of to At the magnet magnetization starting position O2 of the second magnetic steel segment 102 , x2=0.

[0109] In this embodiment, the magnetization starting position O2 of the second magnetic steel segment 102 is located in the middle of the second magnetic steel segment 102 , thereby achieving a magnetic concentration effect in the middle of the second magnetic steel segment 102 to dilute the originally concentrated local magnetic field.

[0110] Exemplarily, in combination with FIG10 , a motor having the magnetic steel structure 100 of the present application and a motor having conventional rectangular magnetic steel are taken as examples to illustrate the efficiency improvement effect of the magnetic steel structure 100 of the present application.

[0111] Electromagnetic simulations show that the output torque of a motor with the magnetic steel structure 100 of the present application is shown by the solid-line curve in FIG10 (i.e., the sinusoidal magnetic steel torque curve in FIG10 ), with an average output torque of 2.224 N·m. The output torque of a motor with conventional rectangular magnetic steel is shown by the dashed-line curve in FIG10 (i.e., the conventional rectangular magnetic steel torque curve in FIG10 ), with an average output torque of 2.168 N·m.

[0112] It can be seen that under rated operating conditions, the average output torque of the motor with the magnetic steel structure 100 of the present application can be increased by 3% compared to a motor with conventional rectangular magnetic steel, achieving an efficiency improvement effect. In other words, the magnetic field focusing effect in the middle of the first magnetic steel segment 101 and the magnetic field focusing effect in the middle of the second magnetic steel segment 102 can achieve both noise reduction and improved performance.

[0113] As shown in FIG6 , in actual application, the magnetic steel structure 100 is applied to the rotor. According to the rotation direction of the rotor, the magnetic steel structure 100 can be adjusted by adjusting the initial magnetization offset angle of the first magnetic steel segment 101 under the same pole. and the initial magnetization offset angle on the second magnetic steel segment 102 make and Not equal, and thus and The left and right lobes of the magnetic steel structure 100 under the same pole are not equal, so as to achieve asymmetry of the left and right magnetic poles, thereby matching the peak resistance torque of the compressor pump body, effectively reducing motor losses, improving motor efficiency, and achieving magnetic pole asymmetry to adapt to the peak resistance torque of the compressor under key working conditions and reduce losses.

[0114] As shown in FIG7 , in some embodiments, the magnetization directions of the first magnetic steel segment 101 and the second magnetic steel segment 102 are both positively oriented in the magnetic pole direction. The magnetization directions of all magnetization positions on the first magnetic steel segment 101 are parallel (as indicated by the arrows on the first magnetic steel segment 101 in FIG7 ). The magnetization directions of all magnetization positions on the second magnetic steel segment 102 are parallel (as indicated by the arrows on the second magnetic steel segment 102 in FIG7 ).

[0115] In this embodiment, the magnetization directions of the first magnetic steel segment 101 and the second magnetic steel segment 102 are both positive to the magnetic pole direction, so that the magnetic steel structure 100 can dilute the originally concentrated local magnetic field, reduce the formation of harmonic magnetic fields in the magnetic field concentration, and reduce the local magnetic field saturation.

[0116] In this embodiment, the magnetic field can be optimized by making the magnetization directions of all the magnetization positions of the first magnetic steel segment 101 parallel and the magnetization directions of all the magnetization positions of the second magnetic steel segment 102 parallel.

[0117] In this application, two magnetization methods are provided:

[0118] One magnetization method is as follows: as shown in FIG5 and FIG6 , relative to the magnetization direction of the first magnetic steel segment 101 at the magnetization starting position O1 of the first magnetic steel segment 101, the magnetization direction of the first magnetic steel segment 101 varies sinusoidally with different magnetization positions; and relative to the magnetization direction of the second magnetic steel segment 102 at the magnetization starting position O2 of the second magnetic steel segment 102, the magnetization direction of the second magnetic steel segment 102 varies sinusoidally with different magnetization positions.

[0119] Another magnetizing method is as shown in FIG7 , the magnetizing directions of the first magnetic steel segment 101 and the second magnetic steel segment 102 are both positive to the magnetic pole direction.

[0120] On the premise that the first magnetic steel segment 101 and the second magnetic steel segment 102 are both sinusoidal structures, the magnetic steel structure 100 magnetized using the above two magnetizing methods can dilute the originally concentrated local magnetic field, reduce the formation of harmonic magnetic fields in the magnetic field density, reduce the local magnetic field saturation level, and thus reduce the vibration noise of the motor.

[0121] 1 to 10 , the present disclosure also provides a rotor structure 200 . The rotor structure 200 includes a rotor core 201 and a magnetic steel structure 100 as described in any of the previous embodiments. The rotor core 201 defines magnetic steel slots 202 . The magnetic steel structure 100 is disposed within the magnetic steel slots 202 .

[0122] In this embodiment, the rotor structure 200 includes a magnetic steel structure 100 as in any of the previous embodiments, so that when the rotor structure 200 is applied to a motor, it can optimize and reduce the harmonic magnetic field in the rotating magnetic field of the motor, reduce the peak value of the harmonic magnetic field during the rotation process of the motor, and thereby reduce the vibration noise caused by the motor.

[0123] As shown in FIG. 1 , optionally, the rotor core 201 is provided with a plurality of magnetic steel slots 202 along the circumferential direction, and the plurality of magnetic steel structures 100 are placed in the plurality of magnetic steel slots 202 in a one-to-one correspondence.

[0124] Optionally, the rotor core 201 is formed by stacking a plurality of punching sheets with magnetic steel slots 202 .

[0125] As shown in combination with FIG. 1 and FIG. 2 , optionally, the rotor core 201 is further provided with auxiliary slots to reduce magnetic leakage.

[0126] In some embodiments, the straight length of the first magnetic steel segment 101 satisfies:

[0127] Wherein, R is the radius of the rotor core 201 ; p is the number of pole pairs; and L1 is the straight length of the first magnetic steel segment 101 .

[0128] In this embodiment, the straight length of the first magnetic steel segment 101 is determined by the radius R and the pole pair number p of the rotor core 201, thereby optimizing the coordination between the magnetic steel structure 100 and the rotor structure 200, further optimizing and reducing the harmonic magnetic field in the rotating magnetic field of the motor, reducing the peak value of the harmonic magnetic field during the motor rotation process, and reducing the vibration noise caused by the motor.

[0129] Optionally, the radius R of the rotor core 201 ranges from 48 mm to 60 mm.

[0130] For example, taking the radius R of the rotor core 201 as 50 mm and the number of pole pairs p as 4, the straight length L1 of the first magnetic steel segment 101 ranges from 20.6 mm to 25.5 mm.

[0131] In some embodiments, the straight length of the second magnetic steel segment 102 satisfies:

[0132] Wherein, R is the radius of the rotor core 201 ; p is the number of pole pairs; and L2 is the straight length of the second magnetic steel segment 102 .

[0133] In this embodiment, the straight length of the second magnetic steel segment 102 is determined by the radius R and the pole pair number p of the rotor core 201, thereby optimizing the coordination between the magnetic steel structure 100 and the rotor structure 200, further optimizing and reducing the harmonic magnetic field in the rotating magnetic field of the motor, reducing the peak value of the harmonic magnetic field during the motor rotation process, and reducing the vibration noise caused by the motor.

[0134] Optionally, the radius R of the rotor core 201 ranges from 48 mm to 60 mm.

[0135] For example, taking the radius R of the rotor core 201 as 50 mm and the number of pole pairs p as 4, the straight length L2 of the second magnetic steel segment 102 ranges from 20.6 mm to 25.5 mm.

[0136] 1 to 10 , an embodiment of the present disclosure further provides a motor, which includes a motor body, a stator, and a rotor structure 200 as in any of the previous embodiments.

[0137] In this embodiment, the motor includes a rotor structure 200 as in any of the previous embodiments, which can optimize and reduce the harmonic magnetic field in the rotating magnetic field of the motor, reduce the harmonic magnetic field peak during the motor rotation process, and reduce the vibration noise caused by the motor.

[0138] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A magnetic steel structure, characterized in that, Comprising: A first magnetic steel segment; A second magnetic steel segment, connected to the end of the first magnetic steel segment; Wherein, both the first magnetic steel segment and the second magnetic steel segment are of sinusoidal curve structures.

2. The magnetic steel structure according to claim 1, wherein The first magnetic steel segment and the second magnetic steel segment are symmetrically arranged with respect to the connection end face of the two; The first magnetic steel segment includes a first peak segment and a first valley segment connected to the end of the first peak segment; The second magnetic steel segment includes a second peak segment and a second valley segment connected to the end of the second peak segment; Along the direction from the first magnetic steel segment to the second magnetic steel segment, the first peak segment and the first valley segment are arranged in sequence, and the second valley segment and the second peak segment are arranged in sequence.

3. The magnetic steel structure according to claim 2, wherein The number of both the first peak segment and the first valley segment is one or more; when the number of both the first peak segment and the first valley segment is more than one, the multiple first peak segments and the multiple first valley segments are arranged alternately; or The number of both the second peak segment and the second valley segment is one or more; when the number of both the second peak segment and the second valley segment is more than one, the multiple second peak segments and the multiple second valley segments are arranged alternately.

4. The magnetic steel structure according to claim 2, wherein The shortest distance H1 between the peak point of the first peak segment and the head-to-tail connection straight line of the first magnetic steel segment, and the straight line length L1 of the first magnetic steel segment, satisfy: H1 ≤ 0.3·L1; Or The shortest distance H2 between the peak point of the second peak segment and the head-to-tail connection straight line of the second magnetic steel segment, and the straight line length L2 of the second magnetic steel segment, satisfy: H2 ≤ 0.3·L2.

5. The magnetic steel structure according to any one of claims 1 to 4, wherein With respect to the magnetization direction at the magnetization starting position of the first magnetic steel segment, the magnetization direction of the first magnetic steel segment changes sinusoidally with the different magnetization positions of the magnetic steel; or With respect to the magnetization direction at the magnetization starting position of the second magnetic steel segment, the magnetization direction of the second magnetic steel segment changes sinusoidally with the different magnetization positions of the magnetic steel.

6. The magnetic steel structure according to claim 5, wherein On the first magnet segment, the magnetization offset angle of the magnetization direction at each magnetization position relative to the magnetization direction at the magnetization starting position of the magnet Satisfy: In the formula, Is the initial magnetization offset angle on the first magnetic steel segment, L1 is the straight line length of the first magnetic steel segment, and x1 is the distance between the magnetization position and the magnetization starting position of the magnetic steel on the first magnetic steel segment; or On the second magnetic steel segment, the magnetization offset angle of the magnetization direction at each magnetization position relative to the magnetization direction at the starting position of magnetization of the magnetic steel Satisfy: Wherein, Is the initial magnetization offset angle on the second magnetic steel segment, L2 is the straight line length of the second magnetic steel segment, and x2 is the distance between the magnetization position and the magnetization starting position of the magnetic steel on the second magnetic steel segment.

7. The magnetic steel structure according to any one of claims 1 to 6, wherein The magnetization directions of both the first magnetic steel segment and the second magnetic steel segment are positive in the pole direction; The magnetization directions of all magnetization positions on the first magnetic steel segment are parallel; the magnetization directions of all magnetization positions on the second magnetic steel segment are parallel.

8. A rotor structure, characterized in that, Comprising: A rotor iron core, provided with a magnetic steel groove; The magnetic steel structure according to any one of claims 1 to 7, arranged in the magnetic steel groove.

9. The rotor structure according to claim 8, characterized in that, The linear length of the first magnetic steel segment of the magnetic steel structure satisfies: Wherein, R is the radius of the rotor iron core; p is the number of pole pairs; L1 is the straight line length of the first magnetic steel segment; Or The linear length of the second magnet segment of the magnet structure satisfies: Wherein, R is the radius of the rotor core; p is the number of pole pairs; L2 is the linear length of the second magnetic steel segment.

10. A motor, characterized in that, Comprising: The motor body; The stator; The rotor structure according to claim 8 or 9.

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