CN114759703A - Rotor subassembly, permanent-magnet machine and compressor - Google Patents

Rotor subassembly, permanent-magnet machine and compressor Download PDF

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Publication number
CN114759703A
CN114759703A CN202210460319.7A CN202210460319A CN114759703A CN 114759703 A CN114759703 A CN 114759703A CN 202210460319 A CN202210460319 A CN 202210460319A CN 114759703 A CN114759703 A CN 114759703A
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CN
China
Prior art keywords
permanent magnet
diffusion
rotor assembly
rotor
heavy metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210460319.7A
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Chinese (zh)
Inventor
李宏涛
邱小华
于岚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Meizhi Precision Manufacturing Co Ltd
Original Assignee
Anhui Meizhi Precision Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anhui Meizhi Precision Manufacturing Co Ltd filed Critical Anhui Meizhi Precision Manufacturing Co Ltd
Priority to CN202210460319.7A priority Critical patent/CN114759703A/en
Publication of CN114759703A publication Critical patent/CN114759703A/en
Priority to JP2023557803A priority patent/JP2024518238A/en
Priority to PCT/CN2023/089698 priority patent/WO2023207775A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Abstract

The invention provides a rotor assembly, a permanent magnet motor and a compressor. The rotor assembly includes: a rotor core including a through hole; the permanent magnet is arranged in the through hole and comprises: a non-diffusion portion; a diffusion part, the diffusion part and at least part of the non-diffusion part are arranged side by side in a first direction, and the first direction is perpendicular to the rotating shaft of the rotor core; wherein the mass ratio of the heavy metal element in the diffusion part is larger than that in the non-diffusion part. Therefore, a diffusion area with strong demagnetization resistance is formed in a partial area of the permanent magnet, so that the local demagnetization resistance of the permanent magnet is improved through the diffusion area, and the overall demagnetization resistance of the rotor assembly is further improved. The possibility of irreversible demagnetization of the rotor assembly is reduced, the permanent magnet motor and related products can be ensured to operate reliably for a long time, and the service life of the products is prolonged.

Description

Rotor subassembly, permanent-magnet machine and compressor
Technical Field
The invention relates to the technical field of compressors, in particular to a rotor assembly, a permanent magnet motor and a compressor.
Background
At present, the air conditioner compressor at home and abroad basically adopts a variable frequency motor, the variable frequency motor generally adopts a permanent magnet motor, the excitation mode of a permanent magnet motor rotor is excited by a permanent magnet, and the demagnetization resistance of the rotor permanent magnet is weakened due to the characteristic of high power density and cost reduction requirement of the existing permanent magnet motor. When the permanent magnet is irreversibly demagnetized, the operation performance and reliability of the motor and the compressor are affected, and the service life of the product is seriously affected.
Therefore, how to design a rotor assembly that can effectively solve the above technical drawbacks is a challenge.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
To this end, a first aspect of the present invention proposes a rotor assembly.
A second aspect of the invention provides a permanent magnet electric machine.
A third aspect of the present invention provides a compressor.
In view of this, the present application proposes, in a first aspect, a rotor assembly including: a rotor core including a through hole; the permanent magnet is arranged in the through hole and comprises: a non-diffusion portion; a diffusion part, the diffusion part and at least part of the non-diffusion part are arranged side by side in a first direction, and the first direction is perpendicular to the rotating shaft of the rotor core; wherein the mass ratio of the heavy metal element in the diffusion part is larger than that in the non-diffusion part.
The present application defines a rotor assembly for use in a permanent magnet electric machine. Specifically, the rotor assembly includes a rotor core, and a permanent magnet. Rotor core folds through a plurality of rotor punching and presses and forms, wherein all is provided with the opening on every rotor punching's the corresponding position, aims at the opening of a plurality of rotor punching and superposes together and can form the through-hole that the axial runs through rotor core on rotor core. The permanent magnet is inserted into the through hole, the shape of the through hole is matched with the shape of the outer contour of the permanent magnet, and the permanent magnet is used for providing excitation.
In the related art, various products provide requirements of high power density and low cost for a permanent magnet motor, so that the design of the permanent magnet motor is limited by the requirements, and the technical problems that the permanent magnet motor is weak in demagnetization resistance and easy to generate irreversible demagnetization occur. If irreversible demagnetization occurs, the permanent magnet motor and associated products can be caused to lose efficacy, the service life of the products is directly influenced, and the use experience of users is damaged.
In contrast, in the technical solution defined in the present application, the permanent magnet is divided into a non-diffusion portion and a diffusion portion by adjusting the content of the heavy metal element in the local region of the permanent magnet. Specifically, on the permanent magnet, the diffusion portion is arranged side by side with at least a part of the non-diffusion portion in the first direction. The first direction is perpendicular to the axial direction of the rotor core, namely, the permanent magnet is cut out perpendicular to the plane of the rotor core, and the diffusion part and the non-diffusion part which are arranged side by side can be obtained on the tangent plane at the same time. On this basis, the ratio of the mass of the heavy metal element to the entire mass of the diffusion portion is the metal element mass ratio g1 of the diffusion portion. Correspondingly, the ratio of the mass of the heavy metal element in the non-diffusion part to the overall mass of the non-diffusion part is the metal element mass ratio g2 of the non-diffusion part, wherein g2 is greater than g 1.
The mass ratio of the heavy metal elements of the diffusion parts is larger than that of the heavy metal elements of the non-diffusion parts, so that the coercive force of the diffusion parts arranged side by side in the first direction can be larger than that of the non-diffusion parts, a diffusion area with strong demagnetization resistance is formed in a partial area of the permanent magnet, the local demagnetization resistance of the permanent magnet is improved through the diffusion area, and the entire demagnetization resistance of the rotor assembly is further improved. The possibility of irreversible demagnetization of the rotor assembly is reduced, the permanent magnet motor and related products can be ensured to operate reliably for a long time, and the service life of the products is prolonged.
Therefore, the rotor assembly solves the technical problems that the permanent magnet motor is weak in demagnetization resistance and easy to generate irreversible demagnetization in the related technology. Meanwhile, the structure can improve the demagnetization resistance of the rotor assembly on the basis of not increasing the volume of the permanent magnet, so that the requirements of high power density and low cost of the permanent magnet motor are met. And then realize optimizing rotor subassembly structure, promote rotor subassembly reliability, extension rotor subassembly life reduces the technological effect of product fault rate.
In addition, the rotor assembly provided by the invention can also have the following additional technical characteristics:
in the above technical solution, the rotor assembly includes a plurality of groups of permanent magnets; the two permanent magnets in the same group are symmetrically arranged on two sides of the first plane, and the rotating shaft of the rotor core and the diameter of the rotor core are both in the first plane.
In this solution, a definition is made of the layout of the permanent magnets on the rotor assembly. Specifically, each rotor assembly is provided with a plurality of groups of permanent magnets, and the plurality of groups of permanent magnets are arranged around the axis of the rotor core. Each group of permanent magnets comprises two permanent magnets, and the two permanent magnets are symmetrically arranged on two sides of the first plane. The diameter of the rotor core and the diameter of the rotor core are both in a first plane, the rotor core and the permanent magnet are specifically intercepted through a plane perpendicular to the axis of the rotor core, and the diameter of the rotor core on the section is the first plane.
Through set up multiunit permanent magnet on the rotor subassembly, can strengthen the anti demagnetization ability of rotor subassembly to further reduce the possibility that rotor subassembly appears irreversible demagnetization. On the basis, through two permanent magnets in each group of permanent magnets symmetrically distributed on two sides of the first plane, a plurality of areas with stronger demagnetization resistance can be formed on the peripheral side of the rotating shaft of the rotor core, so that the entire demagnetization resistance of the rotor core is improved. Thereby realizing the technical effects of improving the reliability of the rotor assembly and prolonging the service life of the rotor assembly.
In any one of the above technical solutions, the two permanent magnets in the same group are distributed in a V-shape.
In the technical scheme, in each group of permanent magnets, two permanent magnets are distributed in a V-shaped shape on two sides of a first plane. Specifically, the permanent magnets are taken through a plane perpendicular to the axis of the rotor core. On the section, an included angle exists between the two permanent magnets in the same group and the first surface, and the included angle is smaller than 90 degrees so as to form two permanent magnets which are distributed in a V shape. The openings of the two permanent magnets distributed in the shape of the V may face the axis of the rotor core or the outside of the rotor core, and this technical solution is not rigidly limited.
By distributing the two permanent magnets in the same group in a V shape, on one hand, a hybrid magnetic circuit structure can be formed in the rotor assembly. The hybrid magnetic circuit structure can improve the stable state performance and the dynamic performance of the rotor assembly, is favorable for improving the power density and the overload capacity of the permanent magnet motor, and is favorable for realizing flux weakening and speed expansion. On the other hand, the coverage area of the permanent magnet in the circumferential direction of the rotor core is favorably increased, and the technical effect of improving the performance of the permanent magnet motor is further achieved.
In any one of the above embodiments, the diffusion portion includes: the first diffusion part is arranged at one end of the non-diffusion part far away from the first plane.
In this embodiment, the diffusion portion includes a first diffusion portion. Specifically, the first diffusion portion is located at an end of the non-diffusion portion away from the first plane, and the first diffusion portion and a part of the non-diffusion portion are arranged side by side in the first direction. By arranging the first diffusion part, two demagnetization resisting areas can be formed at the left end and the right end of the two permanent magnets distributed in a V shape.
Because the mass proportion of the heavy metal element in the first diffusion part is larger than that in the non-diffusion part. The coercivities of the left and right anti-demagnetization regions are greater than the coercivities of the middle non-diffusion region. After saturation magnetization, when an external magnetic field returns to zero, the magnetic induction intensity of the magnetic material does not return to zero, and the magnetic induction intensity can return to zero only by adding a magnetic field with a certain size in the opposite direction of the original magnetization field, so that the magnetic field becomes coercive force. Therefore, the intensity of the coercive magnetic field which can be resisted by the first diffusion part is larger than that of the coercive magnetic field which can be resisted by the non-diffusion part, so that the magnetic induction intensity of the non-diffusion part is kept when the non-diffusion part is at the risk of demagnetization, and further the non-diffusion part is prevented from generating irreversible demagnetization. The anti-demagnetization capability of the permanent magnet is improved, the service life of the rotor assembly is prolonged, and the reliability of the rotor assembly is improved.
In any of the above technical solutions, the mass ratio of the heavy metal elements in the first diffusion part is in the range of: 0.6 or more and 0.8 or less.
In this embodiment, the range of the mass ratio of the heavy metal element in the first diffusion portion is limited. Specifically, the mass ratio of the heavy metal element in the first diffusion portion needs to be 0.6 or more and 0.8 or less. By limiting the mass ratio of the heavy metal elements in the first diffusion part to be more than 0.6, the first diffusion part can be ensured to have the coercive force which is more than that of the non-diffusion part, and the first diffusion part can be ensured to improve the demagnetization resistance of the whole permanent magnet. By limiting the mass ratio of the heavy metal elements in the first diffusion part to be less than 0.8, the production cost of the permanent magnet can be reduced on the basis that the first diffusion part has strong demagnetization resistance, so that the low-cost requirement of the permanent magnet motor is met, and the market competitiveness of the product is further improved.
In any of the above technical solutions, the permanent magnet is cut out by a plane perpendicular to the rotor core; in cross section, the area of the first diffuser portion is S1, and the area of the permanent magnet is S3; the ratio of S1 to S3 is 0.1 or more and 0.4 or less.
In this embodiment, the dimensional relationship between the first diffusion portion and the non-diffusion portion is defined. Specifically, the permanent magnet extends in the through hole along the through hole parallel to the axis of the rotor core, and on the basis of the through hole, the permanent magnet is taken out through a plane perpendicular to the axis of the rotor core, so that the cross section of the first diffusion part and the cross section of the non-diffusion part can be obtained in cross section, the area of the cross section of the first diffusion part is S1, the area of the cross section of the permanent magnet is S3, and the ratio of S1 to S3 is equal to or greater than 0.1 and equal to or less than 0.4.
In a case where the first diffusion portion and the non-diffusion portion are arranged side by side in the first direction, a relative size relationship between the first diffusion portion and the non-diffusion portion may be reflected by a ratio between a cross-sectional area of the first diffusion portion and a cross-sectional area of the permanent magnet. By limiting the ratio of S1 to S3 to be equal to or greater than 0.1, the situation that effective anti-demagnetization support cannot be provided for the non-diffusion part due to the fact that the size of the first diffusion part is too small can be avoided, and accordingly the anti-demagnetization capability of the whole permanent magnet is guaranteed. By limiting the ratio of S1 to S3 to be less than or equal to 0.4, the using amount of heavy metal elements can be reduced on the basis of ensuring the demagnetization resistance of the permanent magnet, so that the cost of the permanent magnet is reduced, and the demagnetization resistance requirement and the low-cost requirement of the permanent magnet motor are both considered. Therefore, the technical effects of optimizing the structural layout of the permanent magnet, improving the reliability of the permanent magnet, prolonging the service life of the permanent magnet and improving the market competitiveness of products are achieved.
In any of the above technical solutions, two permanent magnets in the same group are arranged at intervals.
In the technical scheme, on the basis that two permanent magnets in the same group are symmetrically distributed on two sides of a first plane in a V shape, a gap is reserved between the two permanent magnets. The two permanent magnets in the same group are arranged at intervals, so that on one hand, independent multiple magnetic circuits can be formed in the permanent magnets, and the magnetic circuit distribution in the rotor assembly is optimized. On the other hand, the interval between two permanent magnets can play the magnetism effect of keeping apart to avoid adjacent permanent magnet mutual interference, thereby promote rotor assembly's stability.
In any one of the above embodiments, the diffusion portion further includes: the second diffusion part is arranged at one end of the non-diffusion part close to the first plane.
In this embodiment, the diffusion portion includes a second diffusion portion. Specifically, the second diffusion portion is located at one end of the non-diffusion portion adjacent to the first plane, and the second diffusion portion and a part of the non-diffusion portion are arranged side by side in the first direction. By providing the second diffusion portion, two demagnetization resisting regions can be formed in the central regions of the two permanent magnets distributed in the V-shape, so that the non-diffusion portion is arranged between the first diffusion portion and the second diffusion portion, thereby strengthening the demagnetization resisting capability of the permanent magnets.
Specifically, the mass proportion of the heavy metal element in the second diffusion portion is larger than that in the non-diffusion portion. The coercivities of the two anti-demagnetization regions in the middle are greater than the coercivities of the non-diffusion regions on the two sides. After saturation magnetization, when an external magnetic field returns to zero, the magnetic induction intensity of the magnetic material does not return to zero, and the magnetic induction intensity can return to zero only by adding a magnetic field with a certain size in the opposite direction of the original magnetization field, so that the magnetic field becomes coercive force. Therefore, the intensity of the coercive magnetic field which can be resisted by the second diffusion part is larger than that of the coercive magnetic field which can be resisted by the non-diffusion part, so that the magnetic induction intensity of the non-diffusion part is kept when the non-diffusion part is at the risk of demagnetization, and further the non-diffusion part is prevented from generating irreversible demagnetization. The anti-demagnetization capability of the permanent magnet is improved, the service life of the rotor assembly is prolonged, and the reliability of the rotor assembly is improved.
In any one of the above embodiments, the mass ratio of the heavy metal element in the second diffusion portion is larger than the mass ratio of the heavy metal element in the first diffusion portion.
In this embodiment, the mass fraction of the heavy metal element in the second diffusion portion is larger than the mass fraction of the heavy metal element in the first diffusion portion, that is, the coercivity of the second diffusion portion is larger than the coercivity of the first diffusion portion. Through setting up first diffusion portion and the second diffusion portion that heavy metal element mass accounts for than different, can form the first diffusion region and the second diffusion region that anti demagnetization ability is different on every permanent magnet to through the anti demagnetization performance of the regional strengthening rotor subassembly of the anti demagnetization of gradient, and then reduce the probability that irreversible demagnetization problem appears in the rotor subassembly.
In any of the above technical solutions, the mass ratio of the heavy metal elements in the second diffusion part is in the range of: 0.4 or more and 0.75 or less.
In this embodiment, the range of the mass ratio of the heavy metal element in the second diffusion portion is limited. Specifically, the mass ratio of the heavy metal element in the second diffusion portion needs to be 0.4 or more and 0.75 or less. By limiting the mass ratio of the heavy metal elements in the second diffusion part to be more than 0.4, the second diffusion part can be ensured to have the coercive force which is more than that of the non-diffusion part, and the second diffusion part can be ensured to improve the demagnetization resistance of the whole permanent magnet. The mass ratio of the heavy metal elements of the second diffusion part is limited to be less than 0.75, so that the production cost of the permanent magnet can be reduced on the basis of ensuring that the second diffusion part has strong demagnetization resistance, the low-cost requirement of the permanent magnet motor is met, and the market competitiveness of the product is further improved.
In any of the above technical solutions, the permanent magnet is cut out by a plane perpendicular to the rotor core; in cross section, the area of the second diffuser portion is S2, and the area of the permanent magnet is S3; the ratio of S2 to S3 is 0.1 or more and 0.4 or less.
In this embodiment, the dimensional relationship between the second diffusion portion and the non-diffusion portion is defined. Specifically, the permanent magnet extends in the through hole along the through hole parallel to the axis of the rotor core, and on the basis of the through hole, the cross section of the permanent magnet can be obtained by cutting the permanent magnet through a plane perpendicular to the axis of the rotor core, the area of the cross section of the second diffusion part is S2, the area of the cross section of the permanent magnet is S3, wherein the ratio of S2 to S3 is equal to or greater than 0.1 and equal to or less than 0.4.
In a case where the second diffuser portion and the non-diffuser portion are arranged side by side in the first direction, the relative size relationship between the second diffuser portion and the non-diffuser portion may be reflected by the ratio of the cross-sectional area of the second diffuser portion to the cross-sectional area of the permanent magnet. By limiting the ratio of S2 to S3 to be equal to or greater than 0.1, the situation that effective anti-demagnetization support cannot be provided for the non-diffusion part due to the fact that the size of the second diffusion part is too small can be avoided, and accordingly the anti-demagnetization capability of the whole permanent magnet is guaranteed. By limiting the ratio of S2 to S3 to be less than or equal to 0.4, the dosage of heavy metal elements can be reduced on the basis of ensuring the demagnetization resistance of the permanent magnet, so that the cost of the permanent magnet is reduced, and the demagnetization resistance requirement and the low-cost requirement of the permanent magnet motor are both considered. And then realize optimizing permanent magnet structural configuration, promote the permanent magnet reliability, prolong the permanent magnet life-span, promote the technical effect of product market competitiveness.
In any of the above technical solutions, the permanent magnet is magnetized radially, or the permanent magnet is magnetized in parallel.
In the technical scheme, the magnetizing direction of the permanent magnet can be radial magnetizing or parallel magnetizing. In contrast, the magnetizing directions of the plurality of permanent magnets in the rotor assembly may be kept uniform, and the magnetizing directions of the first diffusion portion, the second diffusion portion, and the diffusion portion in each permanent magnet may be uniform. When the non-diffusion part produces the demagnetization phenomenon because of the external magnetic field, the first diffusion part and the second diffusion part with stronger anti-demagnetization capacity can also ensure the magnetism of the non-diffusion part, so that the non-diffusion part is magnetized through the first diffusion part and the second diffusion part, and the problem of irreversible demagnetization of the permanent magnet is avoided.
In any of the above technical solutions, in the diffusion portion, the heavy metal elements are uniformly distributed in the magnetization direction of the permanent magnet.
In the technical scheme, heavy metal elements are uniformly distributed in the first diffusion part and the second diffusion part in the magnetizing direction of the permanent magnet. Through the heavy metal elements in the diffusion parts which are uniformly distributed in the magnetizing direction, the uniformity of the distribution of the demagnetization resistant areas on the permanent magnet can be improved, and the probability of the irreversible demagnetization of the permanent magnet is further reduced.
This application second aspect provides a permanent-magnet machine, and permanent-magnet machine includes: a rotor assembly as in any one of the previous claims.
In this technical solution, a permanent magnet motor provided with the rotor assembly in any one of the above technical solutions is proposed. Therefore, the permanent magnet motor has the advantages of the rotor assembly in any one of the technical schemes. The technical effects that can be realized by the rotor assembly in any technical scheme can be realized. To avoid repetition, further description is omitted here.
A third aspect of the present application provides a compressor, including: the permanent magnet motor in the technical scheme is provided.
In the technical scheme, the compressor provided with the permanent magnet motor in the technical scheme is provided, and the compressor can be applied to an inverter air conditioner. Therefore, the compressor has the advantages of the permanent magnet motor in the technical scheme. The technical effect that permanent-magnet machine among the above-mentioned technical scheme can realize can be realized. To avoid repetition, further description is omitted here.
Additional aspects and advantages of the invention 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 invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 illustrates one of the structural schematic views of a rotor assembly according to one embodiment of the present invention;
FIG. 2 illustrates a second schematic structural view of a rotor assembly according to an embodiment of the present invention;
fig. 3 illustrates a third structural schematic view of a rotor assembly according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:
100 rotor assembly, 110 rotor core, 120 permanent magnet, 122 non-diffusion part, 124 diffusion part, 1242 first diffusion part, 1244 second diffusion part.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention, taken in conjunction with the accompanying drawings and detailed description, is set forth below. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A rotor assembly, a permanent magnet motor, and a compressor according to some embodiments of the present invention are described below with reference to fig. 1 to 3.
Example one
As shown in fig. 1, 2 and 3, the first aspect embodiment of the present invention provides a rotor assembly 100, where the rotor assembly 100 includes: a rotor core 110 including a through hole; permanent magnet 120, locate in the through-hole, permanent magnet 120 includes: a non-diffusing portion 122; diffusion portion 124, diffusion portion 124 and at least part of non-diffusion portion 122 are arranged side by side in a first direction (direction a and direction B in fig. 3 show the first direction, specifically, a is the thickness direction of the permanent magnet, and B is the width direction of the permanent magnet), the first direction being perpendicular to the rotation axis of rotor core 110; the mass ratio of the heavy metal element in the diffusion portion 124 is larger than the mass ratio of the heavy metal element in the non-diffusion portion 122.
The present application defines a rotor assembly 100, the rotor assembly 100 being applied to a permanent magnet electric machine. Specifically, the rotor assembly 100 includes a rotor core 110, and a permanent magnet 120. Rotor core 110 is laminated through a plurality of rotor punching and is formed, wherein all is provided with the opening on every rotor punching's the corresponding position, aligns the opening of a plurality of rotor punching together and superposes and can form the through-hole that the axial runs through rotor core 110 on rotor core 110. The permanent magnet 120 is inserted into the through hole, and the shape of the through hole is matched with the outer contour shape of the permanent magnet 120, wherein the permanent magnet 120 is used for providing excitation.
In the related art, various products provide requirements of high power density and low cost for a permanent magnet motor, so that the design of the permanent magnet motor is limited by the requirements, and the technical problems that the permanent magnet motor has weak demagnetization resistance and is easy to generate irreversible demagnetization occur. If irreversible demagnetization occurs, the permanent magnet motor and associated products can be caused to lose effectiveness, the service life of the products is directly influenced, and the use experience of users is damaged.
In this regard, in the embodiment defined in the present application, the permanent magnet 120 is divided into the non-diffused portion 122 and the diffused portion 124 by adjusting the content of the heavy metal element in the local region of the permanent magnet 120. Specifically, on the permanent magnet 120, the diffuser portion 124 is arranged side by side with at least part of the non-diffuser portion 122 in the first direction. Here, the first direction is perpendicular to the axial direction of the rotor core 110, that is, by cutting the permanent magnet 120 perpendicular to the plane of the rotor core 110, the diffusion part 124 and the non-diffusion part 122, which are arranged side by side, can be simultaneously obtained on a tangent plane. On this basis, the ratio of the mass of the heavy metal element in diffusion portion 124 to the mass of diffusion portion 124 as a whole is diffusion portion 124 metal element mass ratio g 1. Correspondingly, the ratio of the mass of the heavy metal element in the non-diffusing part 122 to the mass of the whole non-diffusing part 122 is g2, where g2 is greater than g 1.
By limiting the mass ratio of the heavy metal elements of the diffusion part 124 to be greater than that of the heavy metal elements of the non-diffusion part 122, it can be ensured that the coercive force of the diffusion part 124 arranged side by side in the first direction is greater than that of the non-diffusion part 122, so that a diffusion region with strong demagnetization resistance is formed in a partial region of the permanent magnet 120, and the local demagnetization resistance of the permanent magnet 120 is improved by the diffusion region, thereby improving the demagnetization resistance of the entire rotor assembly 100. The possibility of irreversible demagnetization of the rotor assembly 100 is reduced, the permanent magnet motor and related products can be ensured to operate reliably for a long time, and the service life of the products is prolonged.
Therefore, the rotor assembly 100 defined in the present application solves the technical problems of the related art that the permanent magnet motor has weak demagnetization resistance and is easy to generate irreversible demagnetization. Meanwhile, the structure can improve the demagnetization resistance of the rotor assembly 100 on the basis of not increasing the volume of the permanent magnet 120, thereby meeting the requirements of high power density and low cost of the permanent magnet motor. And then realize optimizing rotor subassembly 100 structure, promote rotor subassembly 100 reliability, extension rotor subassembly 100 life reduces the technical effect of product fault rate.
Example two
As shown in fig. 1, 2 and 3, in a second aspect embodiment of the present invention, the rotor assembly 100 includes a plurality of sets of permanent magnets 120; the two permanent magnets 120 in the same group are symmetrically arranged on both sides of the first plane, and the rotating shaft of the rotor core 110 and the diameter of the rotor core 110 are both in the first plane.
In this embodiment, a definition is made of the layout of the permanent magnets 120 on the rotor assembly 100. Specifically, each rotor assembly 100 is provided with a plurality of sets of permanent magnets 120, and the plurality of sets of permanent magnets 120 are disposed around the axis of the rotor core 110. Each set of permanent magnets 120 includes two permanent magnets 120, and the two permanent magnets 120 are symmetrically disposed on both sides of the first plane. The axis of the rotor core 110 and the diameter of the rotor core 110 are both in a first plane, specifically, the rotor core 110 and the permanent magnet 120 are cut through a plane perpendicular to the axis of the rotor core 110, and the diameter of the rotor core 110 in the cross section is the first plane.
By providing the plurality of sets of permanent magnets 120 on the rotor assembly 100, the demagnetization resistance of the rotor assembly 100 can be enhanced, thereby further reducing the possibility of irreversible demagnetization of the rotor assembly 100. On this basis, two permanent magnets 120 in each group of permanent magnets 120 are symmetrically distributed on two sides of the first plane, so that a plurality of areas with strong demagnetization resistance can be formed on the periphery of the rotating shaft of the rotor core 110, and the entire demagnetization resistance of the rotor core 110 can be improved. Thereby realizing the technical effects of improving the reliability of the rotor assembly 100 and prolonging the service life of the rotor assembly 100.
In the above embodiment, the two permanent magnets 120 in the same group are distributed in a V-shape.
In this embodiment, in each set of permanent magnets 120, two permanent magnets 120 are distributed in a V-shape on both sides of the first plane. Specifically, the permanent magnet 120 is cut out by a plane perpendicular to the axis of the rotor core 110. On the cross section, an included angle exists between the two permanent magnets 120 in the same group and the first surface, and the included angle is smaller than 90 degrees, so that two permanent magnets 120 distributed in a V shape are formed. The openings of the two permanent magnets 120 distributed in a V shape may be toward the axis of the rotor core 110, or may be toward the outer side of the rotor core 110, which is not rigidly limited in this embodiment.
By distributing the two permanent magnets 120V-shaped in the same group, a hybrid magnetic circuit structure may be formed in the rotor assembly 100 on the one hand. The hybrid magnetic circuit structure can improve the steady-state performance and the dynamic performance of the rotor assembly 100, and is beneficial to improving the power density and the overload capacity of the permanent magnet motor, and the hybrid magnetic circuit is beneficial to realizing flux-weakening speed expansion. On the other hand, the coverage area of the permanent magnet 120 in the circumferential direction of the rotor core 110 is increased, and the technical effect of improving the performance of the permanent magnet motor is further achieved.
EXAMPLE III
As shown in fig. 1, 2, and 3, in the third embodiment of the present invention, diffuser portion 124 includes: the first diffusion 1242 is provided at an end of the non-diffusion portion 122 remote from the first plane.
In this embodiment, diffuser portion 124 includes a first diffuser portion 1242. Specifically, the first diffuser 1242 is located at an end of the non-diffuser 122 away from the first plane, and the first diffuser 1242 is arranged side by side with a part of the non-diffuser 122 in the first direction. By providing the first diffusion part 1242, two demagnetization resistant regions may be formed at the left and right ends of the two permanent magnets 120 distributed in a V-shape.
Because the mass occupation ratio of the heavy metal element of the first diffusion part 1242 is larger than that of the non-diffusion part 122. The coercive force of the left and right anti-demagnetization regions is larger than that of the middle non-diffusion region. After saturation magnetization, when an external magnetic field returns to zero, the magnetic induction intensity of the magnetic material does not return to zero, and the magnetic induction intensity can return to zero only by adding a magnetic field with a certain size in the opposite direction of the original magnetization field, so that the magnetic field becomes coercive force. It can be seen that the intensity of the coercive magnetic field that the first diffusion 1242 can resist is greater than that of the coercive magnetic field that the non-diffusion 122 can resist, so that the magnetic induction of the non-diffusion 122 is maintained when the non-diffusion 122 is at risk of demagnetization, and thus the non-diffusion 122 is prevented from irreversible demagnetization. The demagnetization resistance of the permanent magnet 120 is improved, the service life of the rotor assembly 100 is prolonged, and the reliability of the rotor assembly 100 is improved.
In any of the above embodiments, the mass ratio of the heavy metal elements in the first diffusion part 1242 is in the range of: 0.6 or more and 0.8 or less.
In this embodiment, a range of the mass ratio of the heavy metal element in the first diffusion part 1242 is defined. Specifically, the mass ratio of the heavy metal element in the first diffusion portion 1242 needs to be 0.6 or more and 0.8 or less. By defining the mass ratio of the heavy metal elements of the first diffusion part 1242 to be greater than 0.6, it is possible to ensure that the first diffusion part 1242 has a coercive force greater than that of the non-diffusion part 122, and thus it is possible to ensure that the first diffusion part 1242 can enhance the demagnetization resistance of the entire permanent magnet 120. The mass ratio of the heavy metal elements of the first diffusion part 1242 is limited to be less than 0.8, so that the production cost of the permanent magnet 120 can be reduced on the basis of ensuring that the first diffusion part 1242 has strong demagnetization resistance, the low-cost requirement of the permanent magnet motor is met, and the market competitiveness of the product is further improved.
In any of the above embodiments, the permanent magnets 120 are cut out by being perpendicular to the face of the rotor core 110; in cross section, the area of the first diffuser 1242 is S1, and the area of the permanent magnet 120 is S3; the ratio of S1 to S3 is 0.1 or more and 0.4 or less.
In this embodiment, the dimensional relationship between the first diffuser portion 1242 and the non-diffuser portion 122 is defined. Specifically, the permanent magnet 120 extends in the through hole along the through hole parallel to the axis of the rotor core 110, and on this basis, by cutting the permanent magnet 120 through a plane perpendicular to the axis of the rotor core 110, the cross section of the first diffuser portion 1242 and the cross section of the non-diffuser portion 122 can be obtained in cross section, the area of the cross section of the first diffuser portion 1242 is S1, and the area of the cross section of the permanent magnet 120 is S3. As shown in fig. 2, the thickness of the permanent magnet 120 is W, the width of the permanent magnet 120 is L, the product of W and L is S3, and the ratio of S1 to S3 is equal to or greater than 0.1 and equal to or less than 0.4.
Where the first diffuser portion 1242 and the non-diffuser portion 122 are arranged side-by-side in a first direction, the relationship between the area of the cross-section of the first diffuser portion 1242 and the area of the cross-section of the permanent magnet 120 may reflect the relative dimensional relationship between the first diffuser portion 1242 and the non-diffuser portion 122. By limiting the ratio of S1 to S3 to 0.1 or more, it is possible to avoid the situation where the first diffusion 1242 is too small in size and cannot provide effective demagnetization resistance support for the non-diffusion 122, thereby ensuring the demagnetization resistance of the permanent magnet 120 as a whole. By limiting the ratio of S1 to S3 to be less than or equal to 0.4, the use amount of heavy metal elements can be reduced on the basis of ensuring the demagnetization resistance of the permanent magnet 120, so that the cost of the permanent magnet 120 is reduced, and the demagnetization resistance requirement and the low-cost requirement of the permanent magnet motor are both considered. And then realize optimizing permanent magnet 120 structural configuration, promote permanent magnet 120 reliability, prolong permanent magnet 120 life-span, promote the technical effect of product market competitiveness.
Example four
As shown in fig. 1, 2 and 3, in the fourth embodiment of the present invention, two permanent magnets 120 in the same group are arranged at intervals.
In this embodiment, on the basis that two permanent magnets 120 in the same group are symmetrically distributed in a V shape on both sides of the first plane, a space is left between the two permanent magnets 120. The two permanent magnets 120 in the same group are spaced apart to form independent magnetic paths in the permanent magnets 120, so as to optimize the magnetic path distribution in the rotor assembly 100. On the other hand, the space between two permanent magnets 120 may play a role of magnetic isolation to avoid the adjacent permanent magnets 120 from interfering with each other, thereby improving the stability of the rotor assembly 100.
In any of the embodiments described above, diffuser portion 124 further includes: the second diffuser portion 1244 is provided at one end of the non-diffuser portion 122 adjacent to the first plane.
In this embodiment, diffuser portion 124 includes a second diffuser portion 1244. Specifically, the second diffuser 1244 is located at an end of the non-diffuser 122 adjacent to the first plane, and the second diffuser 1244 is arranged side by side with a part of the non-diffuser 122 in the first direction. By providing the second diffuser 1244, two demagnetization resistant areas may be formed in the central areas of the two permanent magnets 120 distributed in the V-shape to dispose the non-diffuser 122 between the first diffuser 1242 and the second diffuser 1244, thereby enhancing the demagnetization resistance of the permanent magnets 120.
Specifically, since the mass occupation ratio of the heavy metal element of the second diffusion 1244 is larger than that of the non-diffusion 122. The coercive force of the two demagnetization-resistant areas in the middle part is larger than that of the non-diffusion areas on the two sides. After the magnetic material is magnetized in saturation, when the external magnetic field returns to zero, the magnetic induction intensity of the magnetic material does not return to zero, and the magnetic induction intensity can return to zero only by adding a magnetic field with a certain size in the opposite direction of the original magnetization field, so that the magnetic field becomes coercive force. It can be seen that the intensity of the coercive magnetic field that the second diffusion 1244 can resist is greater than that of the coercive magnetic field that the non-diffusion 122 can resist, so that the magnetic induction of the non-diffusion 122 is maintained when the non-diffusion 122 is at risk of demagnetization, and thus the non-diffusion 122 is prevented from irreversible demagnetization. The demagnetization resistance of the permanent magnet 120 is improved, the service life of the rotor assembly 100 is prolonged, and the reliability of the rotor assembly 100 is improved.
In any of the above embodiments, the mass proportion of the heavy metal element in the second diffusion part 1244 is larger than the mass proportion of the heavy metal element in the first diffusion part 1242.
In this embodiment, the mass proportion of the heavy metal element in the second diffusion 1244 is larger than that in the first diffusion 1242, that is, the coercive force of the second diffusion 1244 is larger than that of the first diffusion 1242. Through setting up first diffusion 1242 and second diffusion 1244 that heavy metal element mass accounts for than different, can form the first diffusion region and the second diffusion region that anti demagnetization ability is different on every permanent magnet 120 to through the anti demagnetization performance of regional strengthening rotor subassembly 100 of anti demagnetization of gradient, and then reduce the probability that rotor subassembly 100 appears irreversible demagnetization problem.
In any of the above embodiments, the mass ratio of the heavy metal elements in the second diffusion part 1244 is in the range of: 0.4 or more and 0.75 or less.
In this embodiment, a range of the mass ratio of the heavy metal element in the second diffusion 1244 is defined. Specifically, the mass ratio of the heavy metal element in the second diffusion portion 1244 needs to be 0.4 or more and 0.75 or less. By defining the second diffusion 1244 with a heavy metal element mass fraction greater than 0.4, it is possible to ensure that the second diffusion 1244 has a coercive force greater than that of the non-diffusion 122, and thus it is possible to ensure that the second diffusion 1244 can enhance the demagnetization resisting capability of the entire permanent magnet 120. By limiting the mass ratio of the heavy metal elements in the second diffusion part 1244 to be less than 0.75, the production cost of the permanent magnet 120 can be reduced on the basis of ensuring that the second diffusion part 1244 has strong demagnetization resistance, so that the low-cost requirement of the permanent magnet motor is met, and the market competitiveness of the product is further improved.
In any of the above embodiments, the permanent magnets 120 are cut out by being perpendicular to the face of the rotor core 110; in cross section, the area of the second diffuser 1244 is S2, and the area of the permanent magnet 120 is S3; the ratio of S2 to S3 is 0.1 or more and 0.4 or less.
In this embodiment, the dimensional relationship between the second diffuser portion 1244 and the non-diffuser portion 122 is defined. Specifically, the permanent magnet 120 extends in the through hole along the through hole parallel to the axis of the rotor core 110, and on this basis, the permanent magnet 120 is taken through a plane perpendicular to the axis of the rotor core 110, so that the cross section of the second diffusing part 1244 and the cross section of the non-diffusing part 122 can be obtained in cross section, the area of the cross section of the second diffusing part 1244 is S2, and the area of the cross section of the permanent magnet 120 is S3, where, as shown in fig. 2, the thickness of the permanent magnet 120 is W, the width of the permanent magnet 120 is L, the product of W and L is S3, and the ratio of S2 to S3 needs to be greater than or equal to 0.1 and less than or equal to 0.4.
In the case where the second diffuser 1244 and the non-diffuser 122 are arranged side by side in the first direction, the relationship between the cross-sectional area of the second diffuser 1244 and the cross-sectional area of the permanent magnet 120 may reflect the relative dimensional relationship between the second diffuser 1244 and the non-diffuser 122. By limiting the ratio of S2 to S3 to 0.1 or more, it is possible to avoid the situation where the effective demagnetization resistance support cannot be provided for the non-diffusion portion 122 due to the excessively small size of the second diffusion portion 1244, thereby ensuring the demagnetization resistance of the entire permanent magnet 120. By limiting the ratio of S2 to S3 to be less than or equal to 0.4, the use amount of heavy metal elements can be reduced on the basis of ensuring the demagnetization resistance of the permanent magnet 120, so that the cost of the permanent magnet 120 is reduced, and the demagnetization resistance requirement and the low cost requirement of the permanent magnet motor are taken into consideration. And further, the technical effects of optimizing the structural layout of the permanent magnet 120, improving the reliability of the permanent magnet 120, prolonging the service life of the permanent magnet 120 and improving the market competitiveness of products are achieved.
EXAMPLE five
In the fifth aspect embodiment of the present invention, the permanent magnets 120 are radially magnetized, or the permanent magnets 120 are magnetized in parallel.
In this embodiment, the magnetization direction of the permanent magnet 120 may be radial magnetization or parallel magnetization. In contrast, the magnetizing directions of the plurality of permanent magnets 120 in the rotor assembly 100 may be kept uniform, and the magnetizing directions of the first diffusion part 1242, the second diffusion part 1244, and the fiscal diffusion part 124 may be uniform for each permanent magnet 120. When the non-diffusion part 122 generates a demagnetization phenomenon due to an external magnetic field, the first diffusion part 1242 and the second diffusion part 1244 having strong demagnetization resistance can also ensure their own magnetism, so that the non-diffusion part 122 is magnetized by the first diffusion part 1242 and the second diffusion part 1244, thereby avoiding the problem of irreversible demagnetization of the permanent magnet 120.
In any of the above embodiments, in the diffusion portion 124, the heavy metal elements are uniformly distributed in the magnetization direction of the permanent magnet 120.
In this embodiment, in the first and second diffusion parts 1242 and 1244, the heavy metal elements are uniformly distributed in the magnetization direction of the permanent magnet 120. By uniformly distributing the heavy metal elements in the diffusion part 124 in the magnetizing direction, the uniformity of the distribution of the demagnetization resistant area on the permanent magnet 120 can be improved, thereby further reducing the probability of the irreversible demagnetization problem of the permanent magnet 120.
EXAMPLE six
An embodiment of a sixth aspect of the invention provides a permanent magnet electric machine, comprising: such as rotor assembly 100 of any of the embodiments described above.
In this embodiment, a permanent magnet motor provided with the rotor assembly 100 of any of the above embodiments is proposed. Therefore, the permanent magnet motor has the advantages of the rotor assembly 100 in any of the embodiments. The technical effects that can be achieved by the rotor assembly 100 of any of the above embodiments can be achieved. To avoid repetition, the description is omitted here.
EXAMPLE seven
A seventh aspect embodiment of the present invention provides a compressor, including: such as the permanent magnet motor of the above embodiments.
In this embodiment, a compressor provided with the permanent magnet motor in the above embodiments is provided, and the compressor can be applied to an inverter air conditioner. Therefore, the compressor has the advantages of the permanent magnet motor in the above embodiment. The technical effects that can be achieved by the permanent magnet motor in the above embodiments can be achieved. To avoid repetition, the description is omitted here.
It is to be understood that, in the claims, the specification and the drawings of the specification of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the terms "upper", "lower" and the like indicate orientations or positional relationships based on those shown in the drawings, and are used only for the purpose of describing the present invention more conveniently and simplifying the description, and are not used to indicate or imply that the device or element referred to must have the specific orientation described, be constructed in a specific orientation, and be operated, and thus the description should not be construed as limiting the present invention; the terms "connect," "install," "fix," and the like are to be understood broadly, for example, "connect" may be a fixed connection between a plurality of objects, a detachable connection between a plurality of objects, or an integral connection; the multiple objects may be directly connected to each other or indirectly connected to each other through an intermediate. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art from the above data specifically.
In the claims, specification, and drawings that follow the present disclosure, the description of the terms "one embodiment," "some embodiments," "specific embodiments," and so forth, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In the claims, specification and drawings of the specification, schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
It is to be understood that, in the claims, the specification and the drawings of the specification of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the terms "upper", "lower" and the like indicate orientations or positional relationships based on those shown in the drawings, and are used only for the purpose of describing the present invention more conveniently and simplifying the description, and are not used to indicate or imply that the device or element referred to must have the specific orientation described, be constructed in a specific orientation, and be operated, and thus the description should not be construed as limiting the present invention; the terms "connect," "install," "fix," and the like are to be understood broadly, for example, "connect" may be a fixed connection between a plurality of objects, a detachable connection between a plurality of objects, or an integral connection; the multiple objects may be directly connected to each other or indirectly connected to each other through an intermediate. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art from the above data specifically.
In the claims, specification, and drawings of the specification, the description of "one embodiment," "some embodiments," "specific embodiments," and so forth, is intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In the claims, specification and drawings of the present invention, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. A rotor assembly, comprising:
a rotor core including a through hole;
the permanent magnet is arranged in the through hole and comprises:
a non-diffusion portion;
a diffusion portion, the diffusion portion and at least a part of the non-diffusion portion being arranged side by side in a first direction, the first direction being perpendicular to a rotation axis of the rotor core;
wherein the mass proportion of the heavy metal element in the diffusion part is larger than that in the non-diffusion part.
2. The rotor assembly of claim 1,
the rotor assembly comprises a plurality of groups of permanent magnets;
the two permanent magnets are in a group, the permanent magnets in the same group are symmetrically arranged on two sides of a first plane, and the rotating shaft of the rotor core and the diameter of the rotor core are both in the first plane.
3. The rotor assembly of claim 2 wherein two of the permanent magnets in the same group are distributed in a chevron shape.
4. The rotor assembly of claim 3, wherein the diffuser portion comprises:
and a first diffusion part arranged at one end of the non-diffusion part far away from the first plane.
5. The rotor assembly of claim 4 wherein the ratio of heavy metal elements in the first diffusion section is in the range of: 0.6 or more and 0.8 or less.
6. The rotor assembly of claim 4,
intercepting the permanent magnets by a plane perpendicular to the rotor core;
in cross section, the area of the first diffusion part is S1, and the area of the permanent magnet is S3;
the ratio of S1 to S3 is 0.1 or more and 0.4 or less.
7. The rotor assembly of claim 4 wherein two of the permanent magnets in the same group are spaced apart.
8. The rotor assembly of claim 7, wherein the diffuser portion further comprises:
and a second diffusion portion provided at one end of the non-diffusion portion adjacent to the first plane.
9. The rotor assembly of claim 8 wherein the mass fraction of the heavy metal element in the second diffusion portion is greater than the mass fraction of the heavy metal element in the first diffusion portion.
10. The rotor assembly of claim 8, wherein the heavy metal element in the second diffusion section is in a mass ratio range of: 0.4 or more and 0.75 or less.
11. The rotor assembly of claim 8,
intercepting the permanent magnets by a plane perpendicular to the rotor core;
in cross section, the area of the second diffuser portion is S2, and the area of the permanent magnet is S3;
the ratio of S2 to S3 is 0.1 or more and 0.4 or less.
12. The rotor assembly of any one of claims 1 to 11,
and the permanent magnets are magnetized in the radial direction, or the permanent magnets are magnetized in parallel.
13. The rotor assembly of claim 12, wherein in the diffusion portion, the heavy metal elements are uniformly distributed in a magnetizing direction of the permanent magnet.
14. A permanent magnet electric machine, comprising:
a rotor assembly as claimed in any one of claims 1 to 13.
15. A compressor, comprising:
a permanent magnet electric machine as claimed in claim 14.
CN202210460319.7A 2022-04-28 2022-04-28 Rotor subassembly, permanent-magnet machine and compressor Pending CN114759703A (en)

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PCT/CN2023/089698 WO2023207775A1 (en) 2022-04-28 2023-04-21 Rotor assembly, permanent magnet motor, and compressor

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WO2023207777A1 (en) * 2022-04-28 2023-11-02 安徽美芝精密制造有限公司 Rotor assembly, permanent magnet motor, and compressor
WO2023207775A1 (en) * 2022-04-28 2023-11-02 安徽美芝精密制造有限公司 Rotor assembly, permanent magnet motor, and compressor

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JP5256724B2 (en) * 2007-12-18 2013-08-07 株式会社安川電機 A rotor core manufacturing method, a rotor core manufactured by the manufacturing method, a rotor thereof, an embedded magnet type rotating electric machine having the rotor, and a vehicle, an elevator, and a processing machine using the rotating electric machine.
JP4896104B2 (en) * 2008-09-29 2012-03-14 株式会社日立製作所 Sintered magnet and rotating machine using the same
JP4961454B2 (en) * 2009-05-12 2012-06-27 株式会社日立製作所 Rare earth magnet and motor using the same
CN114731075A (en) * 2020-07-23 2022-07-08 华为数字能源技术有限公司 Motor rotor and motor
CN112531929A (en) * 2020-12-03 2021-03-19 珠海格力节能环保制冷技术研究中心有限公司 Permanent magnet, rotor structure, permanent magnet motor and compressor
CN114759703A (en) * 2022-04-28 2022-07-15 安徽美芝精密制造有限公司 Rotor subassembly, permanent-magnet machine and compressor
CN114709952A (en) * 2022-04-28 2022-07-05 安徽美芝精密制造有限公司 Rotor subassembly, permanent-magnet machine and compressor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023207777A1 (en) * 2022-04-28 2023-11-02 安徽美芝精密制造有限公司 Rotor assembly, permanent magnet motor, and compressor
WO2023207775A1 (en) * 2022-04-28 2023-11-02 安徽美芝精密制造有限公司 Rotor assembly, permanent magnet motor, and compressor

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