CN115642728A - Halbach array permanent magnet motor rotor, rotor manufacturing method and Halbach array permanent magnet motor - Google Patents
Halbach array permanent magnet motor rotor, rotor manufacturing method and Halbach array permanent magnet motor Download PDFInfo
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- CN115642728A CN115642728A CN202110815843.7A CN202110815843A CN115642728A CN 115642728 A CN115642728 A CN 115642728A CN 202110815843 A CN202110815843 A CN 202110815843A CN 115642728 A CN115642728 A CN 115642728A
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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
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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
- H02K1/278—Surface mounted magnets; Inset magnets
- H02K1/2783—Surface mounted magnets; Inset magnets with magnets arranged in Halbach arrays
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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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
A Halbach array permanent magnet machine rotor, the rotor comprising: a rotor support member, a first permanent magnet array and a second permanent magnet array; the first permanent magnet array comprises a plurality of first permanent magnets with the same cross section shape; the second permanent magnet array comprises a plurality of second permanent magnets with the same cross section shapes; the first permanent magnet array and the second permanent magnet array are arranged on the rotor supporting part in a staggered and spaced mode to form a Halbach array; the rotor supporting component comprises a rotor yoke part and a plurality of supporting and fixing parts; each first permanent magnet comprises a first fixing part and a second fixing part, and the first fixing part is connected with the support fixing part and used for fixing the first permanent magnet; and a gap is formed between the second fixing parts of the two adjacent first permanent magnets, and the second permanent magnets are arranged in the gap and form a self-locking structure with the first permanent magnets.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a Halbach array permanent magnet motor rotor, a rotor manufacturing method and a Halbach array permanent magnet motor.
Background
In recent years, the field of robots has developed rapidly, especially special robots such as legged robots. Such robots place high demands on the actuators: low rotation speed (below 500 rpm), large torque, light weight, large output power, small volume and high response speed. The performance of the actuators directly determines the performance of the robot, while the performance of the actuators is directly determined by the motors. The performance of a robot motor can be measured by the motor constant density, namely: the motor constant per unit mass, i.e. output torque/root (copper loss)/weight of the motor.
One of the keys to increasing the torque density of a motor is increasing the magnetic flux and flux density of the air gap. The Halbach Array is a magnet structure, is an approximate ideal structure in engineering, aims to generate a strongest magnetic field by using a minimum amount of magnets, is a means for effectively improving air gap flux according to research, and has the advantages of good sine property, high magnet utilization rate, low rotor iron loss and the like.
Halbach arrays were proposed by Klaus Halbach, an american scholarer, early in the 1980 s, however, halbach arrays were not common in the practical design and application of electric machines, and one of the main reasons limiting the popularity of Halbach arrays in electric machines was their complex assembly process.
In the conventional Halbach array motor, in order to improve the strength of permanent magnets on a rotor and reduce the vibration and torque pulsation of the motor, the permanent magnets are uniformly distributed on the inner surface of a rotor core in a circumferential manner, wherein tile-shaped, square or fan-shaped magnets are generally adopted. During assembly, the following methods are mainly adopted for assembly, namely:
1. the permanent magnet is forcibly locked through the tool, the contact surface between the permanent magnet and the rotor is bonded by strong glue, and the radial and tangential fixation of the permanent magnet is realized through the bonding force of the glue.
However, the fixing mode needs higher tooling fixture cost, and when the motor runs at a high speed, eddy current loss causes magnet heating, possibly causing glue failure, so that the magnet is loosened or falls off, and danger is generated;
2. the permanent magnet is limited in the radial direction and/or the axial direction by arranging the limiting device at one side of the permanent magnet close to the stator.
However, although the assembly process is relatively simple, the number and types of parts required are increased, and the processing cost is increased; and the rotor generates dead space occupied by the limiting structure in the tangential direction and the radial direction, so that the magnetic flux density of an air gap is reduced.
3. The sleeve is arranged on the outer surface of the rotor, and the permanent magnet is bound through the sleeve to prevent the permanent magnet from falling off.
However, this fixing method requires a special oversleeve process, increasing the number of working steps; the sleeve has a certain thickness and occupies the space of the air gap, so that the magnetic flux density of the air gap is reduced; the oversleeve technology is difficult to use in the motor with smaller axial height, and the universality is not high.
Disclosure of Invention
The invention aims to provide a Halbach array permanent magnet motor rotor, a rotor manufacturing method and a Halbach array permanent magnet motor, which solve the technical problems in the prior art, so that the Halbach array permanent magnet motor has the characteristics of convenience in production and manufacture, high structural strength and long service life while giving full play to excellent electromagnetic performance.
The technical scheme of the Halbach array permanent magnet motor rotor provided by the invention specifically comprises the following steps:
a Halbach array permanent magnet machine rotor, the rotor comprising: the permanent magnet rotor comprises a rotor supporting part, a first permanent magnet array and a second permanent magnet array;
the first permanent magnet array comprises a plurality of first permanent magnets with the same cross section shapes;
the second permanent magnet array comprises a plurality of second permanent magnets with the same cross section shapes;
the first permanent magnet array and the second permanent magnet array are arranged on the rotor supporting part in a staggered and spaced mode to form a Halbach array;
the rotor supporting component comprises a rotor yoke part and a plurality of supporting and fixing parts;
each first permanent magnet comprises a first fixing part and a second fixing part, and the first fixing part is connected with the support fixing part and used for fixing the first permanent magnets;
a gap is formed between the second fixing parts of the two adjacent first permanent magnets, and the second permanent magnets are arranged in the gap and form a self-locking structure with the first permanent magnets.
Preferably, the first permanent magnet is magnetized along the radial direction, and the second permanent magnet is magnetized along the tangential direction.
Preferably, the magnetizing directions of the two adjacent first permanent magnets are opposite, and the magnetizing directions of the two adjacent second permanent magnets are opposite.
Preferably, the radial length of the second fixing portion is 1.3 to 4.5 times the radial length of the first fixing portion.
Preferably, the average tangential width of the second stationary part is 0.35 to 2.0 times the average tangential width of the second permanent magnet.
Preferably, the supporting and fixing part is of a groove structure, and the cross section of the groove structure is in a dovetail groove shape.
Preferably, the first fixing part is approximately trapezoidal in cross section and is matched with the groove structure to realize fixed connection.
Preferably, the second fixing portion is provided with a limiting structure at a position radially far away from the rotor supporting part, and the limiting structure is used for limiting the second permanent magnet.
Preferably, the second fixing portion has a substantially trapezoidal cross-section, and the width of the second fixing portion decreases toward the rotor support member for radially and tangentially limiting the second permanent magnet.
Preferably, the limit structure further comprises an axial limit structure.
The invention also provides a method for manufacturing a rotor of a permanent magnet synchronous motor, wherein the rotor comprises the following steps: a rotor support member, a first permanent magnet array and a second permanent magnet array;
the first permanent magnet array comprises a plurality of first permanent magnets with the same cross section shapes;
the second permanent magnet array comprises a plurality of second permanent magnets with the same cross section shape;
each first permanent magnet comprises a first fixed part and a second fixed part;
the rotor supporting component comprises a rotor yoke part and a plurality of supporting and fixing parts;
the assembling method comprises the following steps:
a magnetizing step, namely respectively magnetizing the first permanent magnet array and the second permanent magnet array;
a first permanent magnet array mounting step of mounting a first fixing portion of a first permanent magnet on a support fixing portion in an axial direction of a rotor support member;
and a second permanent magnet array mounting step of mounting a second permanent magnet in a gap formed between the second fixing parts of two adjacent first permanent magnets along the axial direction of the rotor support part.
Preferably, the manufacturing method further includes, after the second permanent magnet array mounting step:
and a permanent magnet fixing step of respectively fixing the first fixing part and the support fixing part, and the second permanent magnet and the adjacent second fixing part.
Preferably, in the permanent magnet fixing step, the first fixing portion and the support fixing portion, and/or the second permanent magnet and the adjacent second fixing portion are fixed by an adhesive.
In addition, the invention also provides a Halbach array permanent magnet motor which comprises a stator and any one of the rotors.
By applying the Halbach array permanent magnet motor rotor, the rotor manufacturing method and the Halbach array permanent magnet motor provided by the invention, the problems in the prior art can be solved from the source, and the following advantages are brought:
firstly, the Halbach array permanent magnet motor rotor, the rotor manufacturing method and the permanent magnet motor fix the permanent magnet in a self-locking mode, and compared with the technical scheme that the structure is locked by common structural adhesive in the prior art, the critical strength of structural failure can reach ten times that of the prior art, so that the motor rotor can run at high speed, and the problem that the rotor and the motor fail in advance due to centrifugal force generated by high-speed rotation or the failure of the adhesive in a high-temperature environment is avoided;
secondly, the Halbach array permanent magnet motor rotor, the rotor manufacturing method and the permanent magnet motor fix the permanent magnet in a self-locking mode, have low requirements on manufacturing tolerance of the permanent magnet and low design difficulty and cost of a tool fixture, and are suitable for low-cost mass production.
Thirdly, the Halbach array permanent magnet motor rotor, the rotor manufacturing method and the permanent magnet motor provided by the invention can improve the integral rigidity of the motor rotor, reduce noise and are not easy to deform through mutual limit of the permanent magnet and the rotor support.
These and other objects and advantages will become more apparent to those skilled in the art after reading the following portions of this specification in conjunction with the accompanying drawings.
Drawings
The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the appended drawings. It is to be noted that the figures are only examples of the claimed invention. In the drawings, like reference characters designate the same or similar elements.
Fig. 1 is a schematic structural diagram of a rotor of a Halbach array permanent magnet motor according to an embodiment of the present invention;
FIG. 2 is a schematic view of a first permanent magnet array and rotor support member provided in accordance with an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a first permanent magnet according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a second permanent magnet array according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a part of a first permanent magnet array for limiting a second permanent magnet array according to an embodiment of the present invention;
fig. 6 is a schematic view illustrating a magnetizing direction of a permanent magnet according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating major dimensions of cross sections of a first permanent magnet and a second permanent magnet according to an embodiment of the present invention;
fig. 8 is a diagram illustrating a relationship between a ratio of a radial length of a second fixed portion of a rotor of a Halbach array permanent magnet motor with respect to a first permanent magnet to a radial length of a second permanent magnet and a motor performance according to an embodiment of the present invention;
fig. 9 is a diagram illustrating a relationship between a ratio of an average tangential width of a rotor of a Halbach array permanent magnet motor with respect to a second fixed portion of a first permanent magnet to an average tangential width of a second permanent magnet and motor performance according to an embodiment of the present invention;
fig. 10 is a schematic diagram illustrating a first permanent magnet array installation procedure of a Halbach array permanent magnet motor rotor according to an embodiment of the present invention;
fig. 11 is a schematic diagram illustrating a second permanent magnet array installation procedure of a Halbach array permanent magnet motor rotor according to an embodiment of the present invention;
the reference numbers are as follows:
100. rotor support member
110. Rotor yoke
120. Support fixing part
200. First permanent magnet array
210. First permanent magnet
211. First fixed part
212. Second fixed part
213. Limiting structure
300. Second permanent magnet array
310. First permanent magnet
400. Voids
Detailed Description
The detailed features and advantages of the present invention are described in detail in the detailed description which follows, and will be sufficient for anyone skilled in the art to understand the technical content of the present invention and to implement the present invention, and the related objects and advantages of the present invention will be easily understood by those skilled in the art from the description, claims and drawings disclosed in the present specification.
Fig. 1 to fig. 11 show a preferred embodiment of a Halbach array permanent magnet motor rotor, a rotor manufacturing method and a permanent magnet motor provided by the invention.
A Halbach array permanent magnet machine rotor as shown in figure 1, the rotor comprising: a rotor support member 100, a first permanent magnet array 200, a second permanent magnet array 300; the first permanent magnet array 200 includes a plurality of first permanent magnets 210 having the same shape in cross section (cross section in a direction perpendicular to the axial direction of the motor); the second permanent magnet array 300 includes a plurality of second permanent magnets 310 having the same shape in cross section (cross section in a direction perpendicular to the axial direction of the motor).
In a preferred embodiment, the sum of the number of the first permanent magnets 210 and the second permanent magnets 310 is n, and n is an integer multiple of 4.
The first permanent magnet array and the second permanent magnet array are arranged on the rotor support member 100 in a staggered and spaced manner to form a Halbach array.
Since the rotor provided in this embodiment is applied to an inner rotor motor, the first permanent magnet array 200 and the second permanent magnet array 300 are fixed to the radially outer side of the rotor support member 100. In a preferred embodiment, the rotor of the present invention may be applied to an outer rotor motor, and the first permanent magnet array 200 and the second permanent magnet array 300 are fixed to the radially inner side of the rotor support member 100.
In a preferred embodiment, as shown in fig. 6, the first permanent magnet 210 is a radially charged permanent magnet and the second permanent magnet 310 is a tangentially charged permanent magnet.
In a preferred embodiment, the adjacent two first permanent magnets 210 have opposite magnetizing directions, the adjacent two second permanent magnets 310 have opposite magnetizing directions, and the first permanent magnets and the second permanent magnets are respectively mounted on the rotor supporting member 100 in a manner as shown in fig. 6, with the N poles and the S poles staggered, and the magnetizing directions are repeated along the circumference of the rotor supporting member 100.
The magnetizing direction causes the first permanent magnet 210 to generate an electromagnetic attraction force to the second permanent magnet 310 in a direction to make the second permanent magnet close to the rotor support member 100 during assembly, which facilitates simplification of the assembly process.
As shown in fig. 1, the rotor support member 100 includes a rotor yoke portion 110 and a plurality of support fixing portions 120. In a preferred embodiment, the rotor support member 100 is made of a magnetically non-conductive material.
As shown in fig. 2 and 3, the first permanent magnet 210 includes a first fixing portion 211 and a second fixing portion 212, and the first fixing portion 211 is connected to the supporting and fixing portion 120 for fixing the first permanent magnet 210.
The support fixing part 120 is provided in a groove structure having a cross-section (a cross-section perpendicular to the axial direction of the motor) in the shape of a dovetail groove.
The first fixing portion 211 has a trapezoidal cross section and is matched with the groove structure to realize a fixed connection.
A gap 400 is formed between the second fixing parts 212 of two adjacent first permanent magnets 210, and the second permanent magnet 310 is arranged in the gap 400 and forms a self-locking structure with the first permanent magnets 210.
In a preferred embodiment, the second fixing portion 212 is provided with a limiting structure 213 at a position radially far away from the rotor supporting member 100 for limiting the second permanent magnet 310.
As a preferred embodiment of the position limiting structure 213, as shown in fig. 2, the cross section of the second fixing portion 212 is approximately trapezoidal, and the width of the position closer to the rotor supporting member 100 is smaller, so that a radial closing structure exists in the gap 400 formed between two adjacent second fixing portions 212, and the second permanent magnet 310 cannot move radially away from the rotor supporting member 100. This structure ensures that the second permanent magnet 310 is always located in the gap 400 during the rotation of the rotor without slipping or dislocation.
In a preferred embodiment, the position-limiting structure of the second fixing portion 212 can also be, for example: positioning pins, sawtooth flanges and the like.
In a preferred embodiment, the limiting structure may further comprise an axial limiting structure, such as: axial ribs, etc.
In a preferred embodiment, the gap 400 formed between the second fixing portions 212 of two adjacent first permanent magnets 210 and the second permanent magnet 310 are in clearance fit, so as to facilitate the assembly of the second permanent magnet, and meanwhile, the clearance fit can provide a space for the subsequent glue fixing, which can further improve the structural strength.
Fig. 7 shows the main dimensions of the first permanent magnet 210 and the second permanent magnet 310, wherein the radial length of the first fixed part 211 is r _211, the radial length of the second fixed part 212 is r _212, the average tangential width w _212, and the average tangential width w _310 of the second permanent magnet 310 are given.
Fig. 8 and 9 show the relationship between the magnetic field strength and the stress safety factor of the rotor of the Halbach array motor provided by the invention and the sizes of the first permanent magnet 210 and the second permanent magnet 310.
Figure 8 shows a plot of the magnetic field strength, stress safety factor and the ratio of the radial length of the second fixed part to the radial length of the first fixed part for a Halbach array motor rotor, where it can be seen that with other parameters unchanged, as the ratio of the radial length of the second fixed part to the radial length of the first fixed part increases, the magnetic field strength of the motor rotor increases and the stress safety factor of the rotor decreases.
In a preferred embodiment, the radial length of the second fixed part is 1.3 to 4.5 times that of the first fixed part, and in the interval, the magnetic field intensity of the motor rotor (based on the magnetic field intensity of the non-Halbach array, set as 1) is more than 1.2, namely, the magnetic field intensity is improved by more than 20% compared with the magnetic field intensity of the non-Halbach array; the stress safety coefficient of the rotor is kept above 6, and the rotor is relatively stable and not easy to lose efficacy.
Figure 9 shows a diagram of the magnetic field strength of the Halbach array motor rotor versus the ratio of the average tangential width of the second stationary part to the average tangential width of the second permanent magnet, where it can be seen that the magnetic field strength of the motor rotor increases first and then decreases as the ratio of the average tangential width of the second stationary part to the average tangential width of the second permanent magnet increases, with other parameters being unchanged.
In a preferred embodiment, the average tangential width of the second fixing portion is 0.35 to 2.0 times the average tangential width of the second permanent magnet, and in this interval, the magnetic field strength of the motor rotor (based on the magnetic field strength of the non-Halbach array, set as 1) is more than 1.2, that is, the magnetic field strength is increased by more than 20% compared with the magnetic field strength of the non-Halbach array.
The invention comprehensively considers the stress condition and the magnetic field intensity performance of the permanent magnet and provides the appearance size relationship of the first permanent magnet and the second permanent magnet, so that the first permanent magnet 210 has higher stress safety factor, can not be broken or fatigue failure caused by over-concentrated stress, and also fully exerts the characteristic of Halbach high magnetic field density.
The invention also provides a method for manufacturing a rotor of a permanent magnet synchronous motor, wherein the rotor comprises the following steps: a rotor support member 100, a first permanent magnet array 200, a second permanent magnet array 300; the first permanent magnet array 200 includes a plurality of first permanent magnets 210 having the same cross-sectional shape; the second permanent magnet array 300 includes a plurality of second permanent magnets 310 having the same sectional shape; in one embodiment, the sum of the number of the first permanent magnets 210 and the second permanent magnets 310 is n, which is an integer multiple of 4.
The rotor support member 100 includes a rotor yoke 110 and a plurality of support fixing portions 120. The first permanent magnet 210 includes a first fixing portion 211 and a second fixing portion 212, and the first fixing portion 211 is connected to the support fixing portion 120 for fixing the first permanent magnet 210.
The rotor manufacturing method specifically comprises the following steps:
a magnetizing step of respectively magnetizing the first permanent magnet array 200 and the second permanent magnet array 300;
a first permanent magnet array mounting step of mounting the first fixing portion 211 of the first permanent magnet 210 to the support fixing portion 120 in the axial direction of the rotor support member 100;
in a preferred embodiment, the supporting and fixing part 120 is provided in a groove structure having a cross-sectional shape of a dovetail groove. The first fixing portion 211 has a trapezoidal cross section and is matched with the groove structure to realize a fixed connection.
The machined rotor support member 100 is set on a tooling jig, and the first permanent magnets 210 are mounted on the rotor support member 100 such that the N-poles and S-poles thereof are staggered in the manner shown in fig. 6 and 10, so that the first fixing portions 211 of the first permanent magnets 210 having an approximately trapezoidal shape are fitted into the dovetail grooves of the support fixing portions 120 of the rotor support member 100.
In a preferred embodiment, glue may be applied to the dovetail groove of the support fixing part 120 or the surface of the first permanent magnet 210 before or during the insertion of the first permanent magnet 210. So that the radial and tangential positions of the first permanent magnet 210 are defined after mounting. The axial position limitation of the first permanent magnet 210 may be achieved by a tool holder or a structure of the support fixing part 120 itself.
And a second permanent magnet array installation step of installing a second permanent magnet 310 in a gap formed between the second fixing parts 212 of adjacent two first permanent magnets 210 in the axial direction of the rotor support part 100.
In a preferred embodiment, the second permanent magnet 310 is inserted into the gap 400 formed between the second fixing portions 212 of two adjacent first permanent magnets 210 in a manner that the N and S poles are alternately inserted in the axial direction as shown in fig. 6 and 11. By the arrangement, the assembling process of the second permanent magnet 310 is relatively labor-saving and easy, and automation or manual operation is easy.
In a preferred embodiment, glue may be applied to the surface of the second fixing part 212 or the second permanent magnet 310 during the installation of the second permanent magnet 310. So that the radial and tangential positions of the second permanent magnet 310 are defined after mounting.
In a preferred embodiment, the manufacturing method further comprises: a permanent magnet fixing step of respectively fixing the first fixing portion 211 and the support fixing portion 120, and the second permanent magnet 310 and the adjacent second fixing portion 212.
In a preferred embodiment, the permanent magnet fixing step may be fixed by an adhesive, such as: the permanent magnets can be integrally sealed and fixed by air drying and curing of glue.
In a preferred embodiment, the permanent magnet fixing step can also be realized by arranging an axial locking limiting device.
In addition, the invention also provides a Halbach array permanent magnet motor which comprises a stator and any one of the rotors.
According to the Halbach array permanent magnet motor rotor, the rotor manufacturing method and the permanent magnet motor, the permanent magnets are fixed on the rotor in a mode that the rotor supporting part, the first permanent magnet and the second permanent magnet form a self-locking structure, and compared with the prior art, the Halbach array permanent magnet motor rotor has excellent mechanical strength, so that the motor rotor can run at a high speed, and the problem that the rotor and the motor fail in advance due to centrifugal force generated by high-speed rotation or failure of glue in a high-temperature environment is avoided; secondly, in the machining process, the requirement on the manufacturing tolerance of the permanent magnet is low, the design difficulty and the cost of a tool fixture are low, and the method is suitable for low-cost mass production; in addition, the permanent magnet and the rotor support are mutually limited, so that the integral rigidity of the motor rotor can be improved, the noise is reduced, and the motor rotor is not easy to deform.
By taking a small-size (less than 1.5kg and less than 150mm in diameter) motor applied to a robot, low stack height (the stack height of a stator is less than 25 percent of the diameter of the stator), and a multi-pole (the number of poles of a rotor is more than 20) motor as an example, the Halbach array permanent magnet motor rotor and the manufacturing method thereof provided by the invention can play a role in improving large torque and other properties brought by a Halbach array, are easy to automate in manufacturing process, and have excellent mechanical strength. The motor constant of the robot motor adopting the Halbach array rotor in unit mass can be improved by 25% at most, and the Halbach array rotor has important significance for saving the volume and the mass of the motor.
The terms and expressions which have been employed herein are used as terms of description and not of limitation. The use of such terms and expressions is not intended to exclude any equivalents of the features shown and described (or portions thereof), and it is recognized that various modifications may be made which are within the scope of the claims. Other modifications, variations, and alternatives are also possible. Accordingly, the claims should be looked to in order to cover all such equivalents.
Also, it should be noted that although the present invention has been described with reference to the current specific embodiments, it should be understood by those skilled in the art that the above embodiments are merely illustrative of the present invention, and various equivalent changes or substitutions may be made without departing from the spirit of the present invention, and therefore, it is intended that all changes and modifications to the above embodiments be included within the scope of the claims of the present application.
Claims (14)
1. A Halbach array permanent magnet machine rotor, the rotor comprising: a rotor support member, a first permanent magnet array and a second permanent magnet array;
the first permanent magnet array comprises a plurality of first permanent magnets with the same cross section shape;
the second permanent magnet array comprises a plurality of second permanent magnets with the same cross-sectional shapes;
the first permanent magnet array and the second permanent magnet array are arranged on the rotor supporting part in a staggered and spaced mode to form a Halbach array;
the rotor supporting component comprises a rotor yoke part and a plurality of supporting and fixing parts;
it is characterized in that the preparation method is characterized in that,
each first permanent magnet comprises a first fixing part and a second fixing part, and the first fixing part is connected with the support fixing part and used for fixing the first permanent magnet;
and a gap is formed between the second fixing parts of the two adjacent first permanent magnets, and the second permanent magnet is arranged in the gap and forms a self-locking structure with the first permanent magnet.
2. The Halbach array permanent magnet machine rotor of claim 1, wherein the first permanent magnet is magnetized in a radial direction and the second permanent magnet is magnetized in a tangential direction.
3. The Halbach array permanent magnet machine rotor of claim 2, wherein adjacent ones of the first permanent magnets have opposite charging directions and adjacent ones of the second permanent magnets have opposite charging directions.
4. The Halbach array permanent magnet machine rotor of claim 1, wherein the radial length of the second stationary part is 1.3 to 4.5 times the radial length of the first stationary part.
5. The Halbach array permanent magnet machine rotor of claim 1, wherein the average tangential width of the second stationary part is 0.35 to 2.0 times the average tangential width of the second permanent magnets.
6. The Halbach array permanent magnet machine rotor of claim 1, wherein the support fixture is a groove structure having a cross-sectional shape of a dovetail groove.
7. The Halbach array permanent magnet machine rotor of claim 6, wherein the first fixing portion is approximately trapezoidal in cross-section and cooperates with the groove structure to achieve a fixed connection.
8. The Halbach array permanent magnet machine rotor of claim 1 or 7, wherein the second fixture portion is provided with a limiting structure at a position radially away from the rotor support member for limiting the second permanent magnet.
9. The Halbach array permanent magnet machine rotor of claim 8, wherein the second stationary portion is approximately trapezoidal in cross-section, having a smaller width closer to the rotor support member for radially and tangentially confining the second permanent magnet.
10. The Halbach array permanent magnet machine rotor of claim 9, wherein the limit formation further comprises an axial limit formation.
11. A method of manufacturing a rotor of a permanent magnet synchronous motor, the rotor comprising: the permanent magnet rotor comprises a rotor supporting part, a first permanent magnet array and a second permanent magnet array;
the first permanent magnet array comprises a plurality of first permanent magnets with the same cross section shape;
the second permanent magnet array comprises a plurality of second permanent magnets with the same cross section shapes;
each first permanent magnet comprises a first fixed part and a second fixed part;
the rotor supporting component comprises a rotor yoke part and a plurality of supporting and fixing parts;
characterized in that the assembly method comprises:
a magnetizing step of respectively magnetizing the first permanent magnet array and the second permanent magnet array;
a first permanent magnet array mounting step of mounting the first fixing portion of the first permanent magnet to the support fixing portion in the axial direction of the rotor support member;
and a second permanent magnet array mounting step of mounting the second permanent magnets in a gap formed between the second fixing portions of two adjacent first permanent magnets along the axial direction of the rotor support member.
12. The method of manufacturing a rotor of a permanent magnet synchronous motor according to claim 11, further comprising, after the second permanent magnet array mounting step:
and a permanent magnet fixing step of fixing the first fixing part and the support fixing part, and the second permanent magnet and the adjacent second fixing part respectively.
13. The method of manufacturing a rotor of a permanent magnet synchronous motor according to claim 12, wherein in the permanent magnet fixing step, the first fixing portion and the support fixing portion, and/or the second permanent magnet and the adjacent second fixing portion are fixed by an adhesive.
14. A Halbach array permanent magnet machine comprising a stator, characterised in that the permanent magnet machine comprises a rotor according to any one of claims 1 to 10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110815843.7A CN115642728A (en) | 2021-07-19 | 2021-07-19 | Halbach array permanent magnet motor rotor, rotor manufacturing method and Halbach array permanent magnet motor |
| PCT/CN2022/098391 WO2023000865A1 (en) | 2021-07-19 | 2022-06-13 | Halbach array permanent magnet electric motor rotor, rotor manufacturing method and halbach array permanent magnet electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110815843.7A CN115642728A (en) | 2021-07-19 | 2021-07-19 | Halbach array permanent magnet motor rotor, rotor manufacturing method and Halbach array permanent magnet motor |
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| Publication Number | Publication Date |
|---|---|
| CN115642728A true CN115642728A (en) | 2023-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110815843.7A Pending CN115642728A (en) | 2021-07-19 | 2021-07-19 | Halbach array permanent magnet motor rotor, rotor manufacturing method and Halbach array permanent magnet motor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115642728A (en) |
| WO (1) | WO2023000865A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007151321A (en) * | 2005-11-29 | 2007-06-14 | Nissan Motor Co Ltd | Rotor of rotary electric machine |
| JP2010098891A (en) * | 2008-10-17 | 2010-04-30 | Asmo Co Ltd | Motor |
| CN106849409B (en) * | 2016-11-11 | 2020-10-30 | 南方电机科技有限公司 | Motor comprising HALBACH array and equipment comprising motor |
| CN112350463A (en) * | 2020-12-14 | 2021-02-09 | 哈尔滨理工大学 | Novel permanent magnet synchronous motor structure |
| CN215498470U (en) * | 2021-07-19 | 2022-01-11 | 上海舞肌科技有限公司 | Halbach array permanent magnet motor rotor and Halbach array permanent magnet motor |
-
2021
- 2021-07-19 CN CN202110815843.7A patent/CN115642728A/en active Pending
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2022
- 2022-06-13 WO PCT/CN2022/098391 patent/WO2023000865A1/en unknown
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| WO2023000865A1 (en) | 2023-01-26 |
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