CN111799054B - Permanent magnet array - Google Patents
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- CN111799054B CN111799054B CN202010718456.7A CN202010718456A CN111799054B CN 111799054 B CN111799054 B CN 111799054B CN 202010718456 A CN202010718456 A CN 202010718456A CN 111799054 B CN111799054 B CN 111799054B
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Abstract
The invention discloses a permanent magnet array, which comprises a plurality of permanent magnet bodiesRegular triangle magnetic steels with the same size are sequentially arranged and formed, the magnetizing directions of the adjacent regular triangle magnetic steels are different, so that a single side of a magnetic field is converged, the number Z of the magnetic steel blocks meets the condition that Z is 4 x N +3, (N belongs to N*). When the permanent magnet array is used, the magnetizing directions of 2-4 adjacent magnetic steels in the permanent magnet array are converged, and the magnetic lines of force are superposed through the convergence of local N-pole or S-pole magnetic fields, so that the unilateral magnetic flux density of the permanent magnet array is increased, the unilateral magnetic field on the surface of the guide rail is enhanced, and the magnetic field intensity above the array and the effective area of the magnetic field intensity are increased.
Description
Technical Field
The invention mainly relates to the technical field of permanent magnets, in particular to an array of permanent magnets, and particularly relates to a permutation and combination array of permanent magnets in different magnetizing directions.
Background
The conventional permanent magnet array usually adopts a plurality of square permanent magnets to be sequentially arranged to generate a certain magnetic field, and can be applied to various occasions.
For example, a permanent magnet array used in a conventional superconducting levitation model is arranged in an N-S manner only by permanent magnets to form a stable magnetic field, so as to achieve the purpose of levitating a superconducting material.
Patents such as CN106240399B, CN2027345548U, CN105463957B, CN102717725A and CN105803872B, CN201049595Y, and CN106240398B in the prior art are a series of patents in which improvements to permanent magnet arrays therein can be seen. The magnetizing directions of the traditional permanent magnet arrays are opposite to each other in the vertical direction, and in a series of patents, the magnetizing directions of the permanent magnets are opposite to each other in the vertical direction and the horizontal direction, so that the gain of the magnetic field intensity above the traditional permanent magnet guide rail is achieved. The permanent magnet guide rails for superconducting train levitation described in these patents are all specific rectangular magnetic steels arranged in specific magnetizing directions in horizontal and vertical directions to achieve the purpose of increasing the magnetic field strength above the track, but because effective magnetic field convergence is not formed, the actual magnetic field increase effect is still limited.
Disclosure of Invention
Aiming at the problems, the invention provides a permanent magnet array, which adopts a topological structure that a plurality of regular triangle magnetic steels with different magnetizing directions are matched in a rotating way and then spliced into an array, so that a magnetic field is converged, and a unilateral magnetic field on the surface of a guide rail can be enhanced.
The purpose of the invention can be realized by the following technical scheme: the permanent magnet array is characterized in that the array is formed by sequentially arranging a plurality of regular triangle-shaped magnetic steels with the same size, the magnetizing directions of the adjacent regular triangle-shaped magnetic steels are different, so that a single side of a magnetic field is converged, the number of the magnetic steel blocks is Z, and the Z-4 x N +3 is met, (N belongs to N*)。
Furthermore, in the permanent magnet array, an included angle beta exists between two adjacent magnetic steels and the horizontal plane, wherein the beta is more than 0 degree and less than or equal to 90 degrees.
In order to ensure the machinability of the permanent magnet, the sharp corner of each triangular magnet is provided with a chamfer angle which is more than or equal to 0.5mm x 45 degrees. The preferred value of the chamfer is that the radius of the chamfer is not more than 10% of the unilateral side length of the polygonal permanent magnet, the unilateral side length of the polygonal magnet adopted in the implementation case is 25mm, the chamfer is 1mm x 60 degrees, the radius of the chamfer is 4% of the unilateral side length, and the requirement is less than or equal to 10%. Furthermore, in the array structure formed by the regular triangle magnetic steels, the bottom edge of the first triangle magnetic steel block from left to right is specified to be the horizontal direction, and the included angle between the magnetizing direction of the first triangle magnetic steel and the horizontal right direction is alpha, then
(wherein [, ]]Limited value range), the angle theta (theta belongs to R) between the magnetizing direction and the horizontal right direction of each magnetic steel of the guide rail formed by the whole permanent magnet array, and the anticlockwise direction of the angle is positive, then the ith magnetic steel (i belongs to N)*) Direction of magnetization
(in this formula, [ 2 ]]As a rounding function).
Compared with the prior art, the technical scheme of the invention comprises the improvement of a plurality of details besides the improvement of the whole technical scheme, and particularly has the following beneficial effects:
1. according to the improved scheme, the array is formed by sequentially arranging a plurality of regular triangle magnetic steels with the same size, the magnetizing directions of the adjacent regular triangle magnetic steels are different, so that the magnetic fields are converged, the unilateral magnetic field on the surface of the guide rail can be enhanced, and the magnetic field intensity above the array and the effective area of the magnetic field intensity are increased;
2. in the technical scheme of the invention, in the permanent magnet array, the magnetizing directions of 2-4 adjacent magnetic steels are converged, and the magnetic lines of force are superposed through the convergence of local N-pole or S-pole magnetic fields, so that the unilateral magnetic flux density of the permanent magnet array is increased;
3. the permanent magnet array has a strong enhancement effect on the magnetic field above the array, and compared with the traditional scheme, the gain effect reaches more than 40 percent, so that the permanent magnet array is worthy of popularization and application;
4. the permanent magnet array has wide application range, can be applied to guide rails, rotors and stators, obtains unilateral magnetic field intensity which can not be obtained by common permanent magnets, and has great commercial utilization value.
Drawings
FIG. 1 is a schematic view of the present invention.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of another embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a magnetic steel with a chamfer in the embodiment of the invention.
Fig. 5 is a schematic structural view of a first magnetic steel block with a magnetizing angle of 30 degrees in the horizontal direction in the embodiment of the invention.
Fig. 6 is a schematic structural view of a first magnetic steel block with a magnetizing angle of 30 ° in the horizontal direction according to another embodiment of the present invention.
Fig. 7 is a schematic structural view of a first magnetic steel block with a magnetizing angle of 60 ° in the horizontal direction according to another embodiment of the present invention.
Fig. 8 is a magnetic field comparison of the optimized prior art magnetic steel and the magnetic steel array of the present invention.
Fig. 9 is a magnetic field simulation diagram of two-dimensional finite element simulation calculation of equilateral triangle magnetic steel according to the present invention.
FIG. 10 is a magnetic field simulation diagram of two-dimensional finite element simulation calculation of an equilateral triangle magnetic steel according to the present invention.
The figures are labeled as follows:
1 regular triangle magnetic steel, 2 magnetizing directions, 3 soft magnets, 4 chamfers and 5 magnetic induction lines.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in conjunction with the accompanying drawings to make it clear to those skilled in the art how to practice the present invention. While the invention has been described in connection with preferred embodiments thereof, these embodiments are merely illustrative, and not restrictive, of the scope of the invention.
As shown in fig. 1, a permanent magnet array is different from the prior art in that the array is formed by sequentially arranging a plurality of regular triangle-shaped magnetic steels 1 with the same size, the magnetizing directions 2 of the adjacent regular triangle-shaped magnetic steels are different, so that a single side of a magnetic field is converged, the number of the magnetic steel blocks Z satisfies that Z is 4 × N +3, (N belongs to N*)。
Furthermore, in the permanent magnet array, an included angle beta exists between two adjacent magnetic steels and the horizontal plane, wherein the included angle beta is more than 0 degree and less than 90 degrees. In the permanent magnet array, the magnetizing directions of 2-4 adjacent magnetic steels are converged to form N-pole or S-pole square magnetic field convergence, the converging of the magnetizing directions means that the magnetizing directions of two adjacent magnetic steels form an included angle delta, delta is larger than 15 degrees and smaller than 75 degrees, and the magnetic field convergence can occur on the 2-4 magnetic steels.
When the superconducting magnetic field generator is used, the minimum amount of regular triangle magnetic steel is used, a specific array topological structure is formed by adjusting the magnetizing direction and the arrangement direction of the magnetic steel, the magnetic field intensity above the array and the effective area of the magnetic field intensity are increased, a magnetic field with a stronger single side is generated above the array, if the superconducting magnetic field generator is applied to a guide rail, the load carrying capacity of a superconductor suspended above the superconducting magnetic field generator can be increased, and the superconducting magnetic field generator can also be applied to a rotor or stator structure of a motor, so that an unexpected effect can be generated.
For example, the permanent magnet rotor can be applied to a permanent magnet rotor of a synchronous linear motor, and the linear motor rotor formed by adopting the arrangement form of the permanent magnet array can enhance the air gap magnetic field of the linear motor by increasing the unilateral magnetic flux density, so that the counter potential is increased to obtain larger thrust under the condition of the same cost; the magnetic clutch can also be used as a plane type electromagnetic clutch, and the acceleration of the clutch during operation is enhanced and increased in a mode of enhancing the unilateral magnetic flux density, so that the response time is shorter. Because the inner angle sum of the adjacent 3 permanent magnets is limited in one plane (namely 180 degrees), the rotating electric machine cannot be simply applied to a rotating electric machine in a plane mode, but the rotating electric machine with one circumferential surface can be filled with a triangular topological structure in an equivalent mode from a plane to a circumferential curved surface, the acceleration of the clutch during operation can also be enhanced, and the rotating electric machine has a good effect. Meanwhile, the application of the invention is not limited to the above examples, and the special structure and the permanent magnet array topological structure with special magnetizing angle can achieve the unilateral magnetic field intensity enhancement effect which cannot be achieved by the prior art.
Fig. 9 and 10 show the magnetic field obtained by two-dimensional finite element simulation calculation of the equilateral triangular magnetic steel used in the embodiment of the present invention, wherein the arrow represents the magnetizing direction, and the black ring line is the magnetic induction line generated by the magnet. In which several embodiments of the present invention are all formed by arranging the magnets of the two magnetizing modes in a plane in a rotating manner.
Example 1
The magnetic steel blocks adopt a regular triangle structure, and seven blocks are sequentially arranged and spliced to form an isosceles trapezoid structure with a base angle of 60 degrees. The magnetizing direction of each magnetic steel in the magnetic steel array is popularized, the direction parallel to the upper side line of the array is firstly specified as the horizontal direction, the vector direction which faces the cross section of the array and is vertical to the horizontal direction and points to the right is specified as the positive direction, the magnetizing angle theta is the angle which is changed from the horizontal direction in the anticlockwise positive direction, and the local coordinate system of the permanent magnet array is specified as the right-hand system. In this embodiment, in an array structure composed of seven regular triangle magnetic steels, the magnetizing direction of the first magnetic steel on the left is rotated 30 ° counterclockwise along the horizontal direction, then starting from the first magnetic steel, the 2 nd and 3 rd magnetic steels are arranged, the magnetizing direction of each magnetic steel on the right in sequence is rotated 60 ° counterclockwise than that of the previous magnetic steel, the magnetizing direction of the 5 th magnetic steel on the left is rotated 30 ° clockwise along the horizontal direction, then starting from the 5 th magnetic steel, the 6 th and 7 th magnetic steels are arranged, the magnetizing direction of each magnetic steel on the right in sequence is rotated 60 ° counterclockwise than that of the previous magnetic steel, and one magnetic steel with the magnetizing direction being horizontal to the left is arranged at the 4 th magnetic steel position. Referring to fig. 1, the magnetizing direction of the adjacent magnetic steel is arranged in such a way that the convergence of the magnetic poles and the partial demagnetization are not caused.
According to the formula, the number of the magnetic steel blocks Z, Z is 4 x N +3, (N belongs to N)*) In this embodiment, n is 1, the number of magnetic steel blocks is 7, the magnetization direction α of the first magnetic steel block is 30 °, and the magnetization directions of the next magnetic steels satisfy the requirement
Is given by this formula (in this formula [ ])]As a rounding function).
Specifically, the magnetizing direction in the present invention is directed from the S pole to the N pole inside the magnet, so the end of the arrow is the N pole of the magnet, and the beginning of the arrow is the S pole of the magnet. Therefore, in embodiment 1, the first to third permanent magnets converge the N poles, the fifth to seventh permanent magnets converge the S poles, and the fourth permanent magnet ensures smooth rotation of the internal magnetic flux. The convergence of the magnetic field is essentially realized by the convergence of the magnetic poles on one side of the permanent magnet array. Because the steel wire runs outside the magnet in the direction that the N pole points to the S pole (opposite to the inside), the same direction magnetic induction lines are superimposed on each other and the opposite direction magnetic induction lines cancel each other out, see fig. 5.
The enhancement effect of the permanent magnet array on the traditional permanent magnet array can be obtained by carrying out finite element simulation calculation on the magnetic field distribution condition of 10mm above the permanent magnet array, under the condition of the same permanent magnet sectional area, namely when the use amount of the permanent magnet is controlled to be constant, the magnetic field distribution of 10mm above the array, which is achieved by the method, is compared with the magnetic field distribution of 10mm above the traditional permanent magnet array with the rectangular section, the maximum value of the magnetic field is increased to 0.9T from 0.54T, the gain value can reach 67% which is surprising compared with the gain value of the traditional scheme, and the gain can reach 40-60% under the condition of considering the influence of the actual processing technology and the influence of chamfering.
Further, when the magnetizing direction of the first permanent magnet of the permanent magnet array forms an angle of 56-60 degrees with the horizontal direction, namely theta (1) is between 56-60 degrees, the maximum value of the magnetic field intensity above the guide rail is optimal; when the magnetizing direction of the first permanent magnet of the permanent magnet array forms an angle of 43-47 degrees with the horizontal direction, namely theta (1) is 43-47 degrees, the effective area of the magnetic field intensity above the array is optimal.
For example, as shown in fig. 8, the horizontal axis in the figure is the horizontal distance of the guide rail, the vertical axis is the magnetic flux density at a position 10mm above the guide rail, the dotted line is the maximum magnetic density which can be achieved after size optimization in the conventional rectangular optimal magnetizing scheme, and the solid line is the magnetic field distribution 10mm above the permanent magnet array with the equilateral triangular cross section in the first embodiment of the present invention, it can be seen that the magnetic density of the magnetic field is higher than that of the magnetic field which is jointly optimized by the conventional optimal magnetizing optimal size, and the gain effect can still reach 43%. The influence of the processing technology and the chamfer angle is eliminated, the gain effect can still reach 25% -40%, and the superiority of the scheme is proved.
Example 2
The permanent magnet array can be applied to a permanent magnet guide rail and comprises an array structure formed by sequentially arranging a plurality of regular triangle-shaped magnetic steels 1 with the same size, the magnetizing directions of the adjacent regular triangle-shaped magnetic steels are different, so that a magnetic field is converged, the number of the magnetic steel blocks Z meets the condition that Z is 4 x N +3, (N belongs to N*). This embodiment is shown in fig. 6, in which chamfering is taken into consideration. In embodiment 2, the number of magnetic steel blocks satisfies the above formula, that is, n is 1.
Specifically, the sequential arrangement here means that the corresponding sides of the adjacent regular triangle magnetic steels are closely attached to each other, the vertex angle of each regular triangle is provided with a chamfer, the chamfer is more than or equal to 0.5mm x 45 °, specifically, as shown in fig. 4, the preferred value of the embodiment is 0.5mm x 60 ° -1 mm x 60 °, the chamfer can control the spatial distribution of the magnetic field, and further, the larger the chamfer is, the more difficult the processing is, the better the chamfer is; limited by the magnetic field strength (the chamfer will create an additional air gap), the smaller the better, and the applicant can obtain better performance and processing convenience by obtaining the chamfer value according to repeated experiments.
In the array structure formed by a group of a plurality of regular triangle magnetic steels, the bottom edge of the first triangle magnetic steel block from left to right is specified to be in the horizontal direction, and the included angle between the magnetizing direction of the first triangle magnetic steel and the horizontal right direction is specified, then
Here, [ 2 ]]The value range of alpha is represented, the included angle theta (theta belongs to R) between the magnetizing direction and the horizontal right direction of each magnetic steel of the guide rail formed by the whole permanent magnet array is positive, and the counterclockwise direction of the included angle is positive, then the ith magnetic steel (i belongs to N)*) Direction of magnetization
Here, [ 2 ]]Represents the computation of the rounding function. The case described in embodiment 2 satisfies the case where the formula α is 30 °, but is topologically mirrored in the horizontal direction in embodiment 1.
Example 3
In this embodiment, the number of magnetic steel blocks Z satisfies Z4 × N +3, (N ∈ N £ N @*) If n is 1, that is, if there is a topological array structure formed by 7 magnetic steels, in this embodiment, as shown in fig. 7, if there is a chamfer, it is specified that the bottom side of the first triangular magnetic steel block from left to right is in the horizontal direction, and the angle between the magnetizing direction of the first triangular magnetic steel and the horizontal right direction is, then
Here, [ 2 ]]The value range of alpha is shown, the implementation case 3 meets the condition that the magnetizing angle alpha of the first magnetic steel is 60 degrees, the magnetizing direction of each subsequent permanent magnet meets the detailed formula, the included angle theta (theta belongs to R) between the magnetizing direction of each magnetic steel formed by the whole permanent magnet array and the horizontal right direction is positive, and the anticlockwise direction of the included angle is positive, so that the ith magnetic steel (i belongs to N)*) Direction of magnetization
(herein [ 2 ]]Representing the computation of the rounding function).
The magnetizing direction of the first magnetic steel on the left is rotated by 60 degrees counterclockwise along the horizontal direction, specifically referring to fig. 7, the magnetizing direction is parallel to one side of a regular triangle from the S pole to the N pole, then starting from the first magnetic steel, the 2 nd and 3 rd magnetic steels are arranged, the magnetizing direction of each magnetic steel on the right sequentially rotates by 30 degrees counterclockwise compared with the magnetizing direction of the previous magnetic steel, the magnetizing direction of the 5 th magnetic steel on the left is rotated by 60 degrees clockwise along the horizontal direction, then starting from the 5 th magnetic steel, the 6 th and 7 th magnetic steels are arranged, the magnetizing direction of each magnetic steel on the right sequentially rotates by 30 degrees counterclockwise compared with the magnetizing direction of the previous magnetic steel, and a magnetic steel with the magnetizing direction being horizontal to the left is arranged at the 4 th magnetic steel position. The magnetizing direction of the adjacent magnetic steel is distributed in such a way that the convergence of the magnetic poles and the partial demagnetization cannot be caused.
The magnetizing direction of the invention refers to that the magnetic steel points to the N pole from the S pole along the side edge of the magnetic steel in the magnet, so the tail end of the arrow is the N pole of the magnet, and the starting end of the arrow is the S pole of the magnet. Therefore, in embodiment 3, the first to third permanent magnets converge the N pole, the fifth to seventh permanent magnets converge the S pole, and the fourth permanent magnet ensures smooth rotation of the internal magnetic flux. The convergence of the magnetic field is essentially realized by the convergence of the magnetic poles on one side of the permanent magnet array. Because the direction of travel of the steel magnet wire outside the magnet is such that the N pole points towards the S pole (opposite to the inside), the equally directed lines of magnetic induction overlap each other and the oppositely directed lines of magnetic induction cancel each other out, see fig. 7.
Example 4
Referring to fig. 2, the number of magnetic steel blocks Z satisfies Z4 × N +3, (N ∈ N +*) Under the condition that the middle n is 1, namely a permanent magnet array consisting of a topological array structure consisting of 7 pieces of magnetic steel adopts a right-hand system coordinate, the magnetizing direction of the first piece of magnetic steel on the left is rotated 30 degrees anticlockwise right along the horizontal direction, then six pieces of magnetic steel are firstly arranged from the first piece of magnetic steel, the magnetizing direction of each piece of magnetic steel which sequentially faces right is rotated 60 degrees anticlockwise compared with the magnetizing direction of the previous piece of magnetic steel, and then six pieces of magnetic steel are arrangedThe most important difference between the two magnetic steels is that the arrangement modes of the two magnetic steels are different compared with embodiment 1, embodiment 4 is a mirror image structure in embodiment 1, and the magnetization directions of the magnetic steels in embodiment 4 are as shown in fig. 6, so that the adjacent magnetic steels are converged along the vertex angle of the magnetization direction, that is, the N poles of the magnetic steels in 1-3 are converged, and the S poles of the magnetic steels in 5-7 are converged, and the convergence of the same magnetic poles can form magnetic pole convergence, which can cause partial demagnetization of the magnetic steels with triangular cross sections, thereby affecting the magnetic field distribution on the unilateral surface, so the arrangement mode has a poorer effect than that of embodiment 1.
Further, to improve the effect of this alignment, for the 4 th x N, (N e N)*) The block magnet steel is replaced by a soft magnet 3 with the same structure, wherein n is equal to 1, and different effects can be produced. As shown in fig. 3, the gray part in the figure is a substituted soft magnetic material, the direction of the magnetic flux inside the gray part is approximately close to the horizontal direction, the addition of the soft magnetic material can greatly reduce the magnetic field strength of the left and right magnetic poles, thus reducing the problem of demagnetization caused by convergence of the same magnetic poles, and the arrangement of the soft magnetic material also greatly reduces the cost of the permanent magnet array, although the effect is weaker than that of the magnetic field enhancement in embodiment 1, when the gain of 10-12% can be achieved on the basis of the prior art, the performance-price ratio is higher.
The invention can be further applied to a permanent magnet rotor of a synchronous linear motor, and the linear motor rotor formed by adopting the arrangement form of the permanent magnet array can enhance the air gap magnetic field of the linear motor by increasing the single-side magnetic flux density, so that the counter electromotive force is increased to obtain larger thrust under the condition of the same cost; the magnetic clutch can also be used as a plane type electromagnetic clutch, and the acceleration of the clutch during operation is enhanced and increased in a mode of enhancing the unilateral magnetic flux density, so that the response time is shorter. Because the inner angle sum of the adjacent 3 permanent magnets is limited in one plane (namely 180 degrees), the rotating electric machine cannot be simply applied to a rotating electric machine in a plane mode, but the rotating electric machine with one circumferential surface can be filled with a triangular topological structure in an equivalent mode from a plane to a circumferential curved surface, the acceleration of the clutch during operation can also be enhanced, and the rotating electric machine has a good effect.
It should be noted that many variations and modifications of the embodiments of the present invention fully described are possible and are not to be considered as limited to the specific examples of the above embodiments. The above examples are given by way of illustration of the invention and are not intended to limit the invention. In conclusion, the scope of the present invention shall include those alterations or substitutions and modifications which are obvious to those of ordinary skill in the art, and shall be subject to the appended claims.
Claims (5)
1. The permanent magnet array is characterized in that the array is formed by sequentially arranging a plurality of regular triangle-shaped magnetic steels with the same size, the magnetizing directions of the adjacent regular triangle-shaped magnetic steels are different, so that a single side of a magnetic field is converged, the number of the magnetic steel blocks Z meets the condition that Z is 4 x N +3, (N belongs to N*) (ii) a In the array structure formed by regular triangular magnetic steels, the bottom side of a first triangular magnetic steel block from left to right is specified to be in the horizontal direction, and the included angle between the magnetizing direction of the first triangular magnetic steel and the horizontal right direction is alpha, so that the magnetic steel is in a magnetic flux state
The angle theta (theta belongs to R) between the magnetizing direction of each magnetic steel of the guide rail formed by the whole permanent magnet array and the horizontal right direction, and the anticlockwise direction of the angle is positive, then the ith magnetic steel (i belongs to N)*) Direction of magnetization
The sharp angle of each triangular magnet is provided with a chamfer angle, and the chamfer angle value is 0.5mm 60 degrees to 1mm 60 degrees; when the included angle theta between the magnetizing direction of the first permanent magnet of the permanent magnet array and the horizontal direction is 56-60 degrees, the strongest magnetic field intensity is obtained above the guide rail; when the included angle theta between the magnetizing direction of the first permanent magnet of the permanent magnet array and the horizontal direction is 43-47 degrees, the magnetic field intensity above the array obtains the optimal effective area.
2. The permanent magnet array according to claim 1, wherein in the permanent magnet array, two adjacent magnetic steels have an included angle β with the horizontal plane, and β is greater than 0 ° and less than 90 °.
3. The permanent magnet array according to claim 1, wherein the magnetizing directions of 2-4 adjacent magnetic steels in the permanent magnet array converge.
4. The permanent magnet array according to claim 1, wherein in an array structure composed of seven regular triangle-shaped magnetic steels, the magnetizing direction of the first magnetic steel on the left is rotated 30 ° counterclockwise to the right along the horizontal direction, then from the first magnetic steel, the 2 nd and 3 rd magnetic steels are arranged, the magnetizing direction of each magnetic steel on the right sequentially rotates 60 ° counterclockwise than that of the previous magnetic steel, the magnetizing direction of the 5 th magnetic steel on the left is rotated 30 ° clockwise to the left along the horizontal direction, then from the 5 th magnetic steel, the 6 th and 7 th magnetic steels are arranged, the magnetizing direction of each magnetic steel on the right sequentially rotates 60 ° counterclockwise than that of the previous magnetic steel, and a magnetic steel with the magnetizing direction being horizontal to the left is arranged at the 4 th magnetic steel position.
5. The permanent magnet array of claim 1, wherein the 4 th x N, (N e N) in the array structure consisting of a plurality of regular triangular magnetic steels*) The block magnetic steel is replaced by soft magnetic material with the same structure.
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| CN112259321B (en) * | 2020-10-30 | 2023-09-22 | 苏州英磁新能源科技有限公司 | Electromagnetic unit, array and application |
| CN112635152A (en) * | 2020-12-14 | 2021-04-09 | 瑞声精密制造科技(常州)有限公司 | Annular array magnetic steel system and magnetic attraction positioning system |
| CN112953151B (en) * | 2021-03-04 | 2022-05-03 | 北京航空航天大学 | Outer rotor motor of polygonal dovetail type spliced magnetic steel structure |
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