CN108462358B - Cylindrical double-stator salient pole permanent magnet linear motor based on halbach array - Google Patents
Cylindrical double-stator salient pole permanent magnet linear motor based on halbach array Download PDFInfo
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- CN108462358B CN108462358B CN201810442938.7A CN201810442938A CN108462358B CN 108462358 B CN108462358 B CN 108462358B CN 201810442938 A CN201810442938 A CN 201810442938A CN 108462358 B CN108462358 B CN 108462358B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 65
- 238000003491 array Methods 0.000 claims abstract description 18
- 229910052742 iron Inorganic materials 0.000 claims description 29
- 238000004804 winding Methods 0.000 claims description 16
- 235000012771 pancakes Nutrition 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 12
- 230000005415 magnetization Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/12—Transversal flux machines
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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Linear Motors (AREA)
Abstract
A cylindrical double-stator salient pole permanent magnet linear motor based on halbach arrays belongs to the technical field of special motors. The invention solves the technical problems that: the existing cylindrical permanent magnet linear motor has the problem of low thrust density and power density. The invention comprises an inner primary and an outer primary and a secondary matched with the inner primary, wherein the secondary is a salient pole halbach array, and the inner salient pole halbach array and the outer salient pole halbach array are included. The radial magnetizing permanent magnets and the axial magnetizing permanent magnets are alternately and closely arranged to form a salient pole halbach array; the salient pole halbach magnet array clung to the surface of the inner air gap back iron forms an inner layer salient pole halbach array, and the salient pole halbach magnet array clung to the surface of the outer air gap back iron forms an outer layer salient pole halbach array. The invention is especially suitable for the application occasions of linear motor engineering with larger power and thrust requirements.
Description
Technical Field
The invention relates to a permanent magnet linear motor, in particular to a cylindrical double-stator salient pole permanent magnet linear motor based on a halbach array, and belongs to the technical field of special motors.
Background
Permanent magnet linear motors are widely used in various fields of industry. Such as free piston engines for electric vehicles, industrial machine tools, maglev trains, electromagnetic guns, electromagnetic catapults, and the like. Most of the conventional cylindrical permanent magnet linear motors have a common single-primary-single-pole structure, so that the thrust is small, and the requirements of occasions needing large thrust are difficult to meet. The common halbach permanent magnet array has larger magnetic leakage phenomenon, and the back iron consumption and the electromagnetic loss are larger. Therefore, there is a need to design a cylindrical double-stator salient pole permanent magnet linear motor based on halbach array with a new structure so as to solve the problems of low thrust density, low power density, high secondary mover mass and large volume of the conventional permanent magnet linear motor.
Disclosure of Invention
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
Because the core technical problem of the conventional cylindrical permanent magnet linear motor is that the thrust density and the power density are small, the invention aims to simulate and calculate the electromagnetic field and the vortex field of the motor according to the electromagnetic theory of the motor and optimize the permanent magnet array structure, and provides the cylindrical double-stator salient pole permanent magnet linear motor based on the halbach array, which is used for greatly improving the thrust density and the power density of the conventional cylindrical permanent magnet linear motor, and reducing the volume and the cost.
The scheme adopted by the invention is as follows: a cylindrical double-stator salient pole permanent magnet linear motor based on halbach array comprises an inner primary stator structure, an outer primary stator structure and a secondary rotor structure matched with the inner primary stator structure and the outer primary stator structure, wherein an inner air gap is formed between the inner primary stator structure and the secondary rotor structure, and an outer air gap is formed between the outer primary stator structure and the secondary rotor structure;
the secondary rotor structure is a salient pole halbach array, and comprises an inner layer salient pole halbach array and an outer layer salient pole halbach array, wherein radial magnetizing permanent magnets and axial magnetizing permanent magnets are mutually and closely arranged to form the salient pole halbach array, the salient pole halbach array which is closely attached to an inner layer air gap and is positioned on the back iron surface of the secondary rotor structure forms the inner layer salient pole halbach array, and the salient pole halbach array which is closely attached to the outer layer air gap and is positioned on the back iron surface of the secondary rotor structure forms the outer layer salient pole halbach array; the secondary mover structure of the halbach array of salient poles and the inner primary stator structure and the outer primary stator structure which are matched with the secondary mover structure and contain energized windings form the cylindrical double-stator salient pole permanent magnet linear motor based on the halbach array.
Further: the radial magnetizing permanent magnets with the conical pentagons in cross section and the axial magnetizing permanent magnets with the trapezoidal cross section are alternately and closely arranged to form a salient pole halbach array. By the arrangement, the magnetic density of the air gap side can be greatly enhanced, the magnetic density of the back iron side is obviously reduced, and the magnetic leakage is greatly reduced or even completely eliminated. The consumption of the permanent magnet can be effectively reduced, and the manufacturing cost of the motor is reduced.
Further: the salient pole halbach arrays on two sides of the back iron are in mirror symmetry with respect to the axial center plane of the back iron, wherein the magnetizing directions of the two symmetrical radial magnetizing permanent magnets are opposite, and the magnetizing directions of the two symmetrical axial magnetizing permanent magnets are the same. The arrangement reduces the mutual interference of the magnetic fields of the two layers of permanent magnets inside and outside the secondary rotor.
Further: the back iron is characterized in that a plurality of air cavities with rectangular cross sections are formed in the middle of the back iron, the width of each air cavity is equal to the length of the long bottom edge of the axial magnetizing permanent magnet with the trapezoid cross section, the axial air cavities are equally spaced, and the spacing distance is the length of the long bottom edge of the axial magnetizing permanent magnet with the trapezoid cross section. The air cavity in the middle of the back iron can reduce secondary quality, rotor material consumption and eddy current loss, and the interaction between permanent magnets at two sides can be reduced.
Further: the salient pole halbach array surrounds a longitudinal axis and is formed by rolling the two transverse ends of the salient pole composite array into a cylinder shape in an end-to-end mode.
Further: the inner primary stator structure and the outer primary stator structure are provided with a certain number of grooves on one side close to the secondary rotor structure, and the pancake windings are embedded in the grooves and connected.
Further: the secondary rotor structure of the salient pole halbach array is connected with the inner primary stator structure and the outer primary stator structure which are matched with the secondary rotor structure and contain energized windings through connecting shafts and bearing assemblies.
The invention achieves the following effects:
1. the invention provides a cylindrical double-stator salient pole permanent magnet linear motor based on a halbach array, which adopts a double-stator structure, improves the thrust of the motor and can solve the problem of insufficient thrust of the linear motor in the existing high-thrust occasion.
2. The invention provides a cylindrical double-stator salient pole permanent magnet linear motor based on a halbach array, which adopts a novel salient pole halbach structure permanent magnet array, and is formed by alternately and closely arranging radial magnetizing permanent magnets with conical pentagons in cross section and axial magnetizing permanent magnets with trapezoids in cross section, so that the magnetic density of an air gap side can be greatly enhanced, the magnetic density of a back iron side is obviously reduced, and the magnetic leakage is greatly reduced or even completely eliminated. The consumption of the permanent magnet can be effectively reduced, and the manufacturing cost of the motor is reduced.
3. The invention provides a cylindrical double-stator salient pole permanent magnet linear motor based on halbach arrays, wherein salient pole halbach arrays on two sides of a secondary back iron air gap are in mirror symmetry with respect to the axial center plane of the back iron, and mutual interference of magnetic fields of an inner permanent magnet and an outer permanent magnet of a secondary of a rotor is reduced.
4. The invention provides a cylindrical double-stator salient pole permanent magnet linear motor based on halbach arrays. The mutual interference of the magnetic fields of the inner permanent magnet and the outer permanent magnet of the secondary of the rotor is reduced, and meanwhile, the material consumption of the rotor is reduced, and the quality of the rotor is lightened.
5. The invention is especially suitable for the application occasions of linear motor engineering with larger power and thrust requirements.
Drawings
FIG. 1 is a schematic axial section structure of a cylindrical double-stator salient pole permanent magnet linear motor based on halbach arrays;
FIG. 2 is a schematic diagram of a radial cross-section structure of a cylindrical double-stator salient pole permanent magnet linear motor based on halbach arrays;
fig. 3 is a schematic diagram of a secondary structure of a rotor of a cylindrical double-stator salient pole permanent magnet linear motor based on halbach arrays;
fig. 4 is a schematic diagram II of a secondary structure of a rotor of a cylindrical double-stator salient pole permanent magnet linear motor based on a halbach array;
fig. 5 is a schematic diagram of a common halbach permanent magnet array structure;
fig. 6 is a schematic diagram II of a common halbach permanent magnet array structure;
FIG. 7 is a schematic diagram of a salient pole halbach permanent magnet array structure of the present invention;
FIG. 8 is a schematic diagram of the structural dimensions of a salient pole halbach permanent magnet array of the present invention;
FIG. 9 is a diagram of field finite element simulated magnetic lines of a cylindrical double-stator salient permanent magnet linear motor based on halbach arrays;
FIG. 10 is a schematic view of the primary structure of the present invention;
FIG. 11 is a schematic diagram of a three-dimensional model of a cylindrical double-stator salient pole permanent magnet linear motor based on halbach arrays;
FIG. 12 is a schematic diagram of one half of a three-dimensional model of a cylindrical double-stator salient pole permanent magnet linear motor based on halbach arrays;
FIG. 13 is a three-quarter schematic diagram of a cylindrical double-stator salient pole permanent magnet linear motor three-dimensional model based on halbach arrays;
FIG. 14 is a schematic diagram of a three-dimensional model of a cylindrical double-stator salient pole permanent magnet linear motor based on halbach arrays;
in the figure, 1. An outer primary core; 2. an outer primary winding; 3. axially magnetizing the permanent magnet; 4. radial magnetizing permanent magnets; 5. back iron; 6. an air chamber; 7. an inner primary core; 8. an outer layer air gap; 9. an inner layer air gap; 10. an inner primary winding; 11. an inner salient pole halbach array; 12. an outer salient pole halbach array; 13. an outer primary stator structure; 14. an inner primary stator structure; 15. secondary mover structure.
Detailed Description
In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made in order to achieve the developer's specific goals, such as compliance with system-and business-related constraints, and that these constraints will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
It should be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only the device structures and/or processing steps closely related to the solution according to the present invention are shown in the application document, while other details not greatly related to the present invention are omitted.
Examples: referring to fig. 1 to 14, a cylindrical double-stator salient pole permanent magnet linear motor based on halbach array in the present embodiment includes an inner primary stator structure 14, an outer primary stator structure 13 and a secondary mover structure 15 cooperating with the inner primary stator structure 14 and the secondary mover structure 15, an inner air gap 9 is formed between the inner primary stator structure 14 and the secondary mover structure 15, and an outer air gap 8 is formed between the outer primary stator structure 13 and the secondary mover structure 15;
the secondary rotor structure 15 is a salient pole halbach array, and comprises an inner layer salient pole halbach array 11 and an outer layer salient pole halbach array 12, wherein radial magnetizing permanent magnets 4 and axial magnetizing permanent magnets 3 are alternately and closely arranged to form the salient pole halbach array, the salient pole halbach array which is closely attached to an inner layer air gap 9 and is positioned on the surface of a back iron 5 of the secondary rotor structure 15 forms the inner layer salient pole halbach array, and the salient pole halbach array which is closely attached to an outer layer air gap 8 and is positioned on the surface of the back iron 5 of the secondary rotor structure 15 forms the outer layer salient pole halbach array; the secondary mover structure 15 of the halbach array of salient poles and the inner primary stator structure 14 and the outer primary stator structure 13 which are matched with the secondary mover structure and contain energized windings form a cylindrical double-stator salient pole permanent magnet linear motor based on the halbach array.
More specifically: the radial magnetizing permanent magnets 4 with the conical pentagons in cross section and the axial magnetizing permanent magnets 3 with the trapezoidal cross section are alternately and closely arranged to form a salient pole halbach array.
More specifically: the salient pole halbach arrays on two sides of the back iron 5 are in mirror symmetry with respect to the axial center plane of the back iron 5, wherein the magnetizing directions of the two symmetrical radial magnetizing permanent magnets 4 are opposite, and the magnetizing directions of the two symmetrical axial magnetizing permanent magnets 3 are the same.
More specifically: the back iron 5 is provided with a plurality of air cavities 6 with rectangular cross sections in the middle, the width of each air cavity 6 is equal to the long bottom edge of the axial magnetizing permanent magnet 3 with the trapezoidal cross section, the axial air cavities 6 are equally spaced, and the spacing distance is the side length of the long bottom edge of the axial magnetizing permanent magnet 3 with the trapezoidal cross section.
More specifically: the salient pole halbach array surrounds a longitudinal axis and is formed by rolling the two transverse ends of the salient pole composite array into a cylinder shape in an end-to-end mode.
More specifically: the inner primary stator structure 14 and the outer primary stator structure 13 are provided with a number of slots on the side close to the secondary mover structure 15, in which pancake windings are embedded and connected.
More specifically: the secondary mover structure 15 of the salient pole halbach array and the inner primary stator structure 14 and the outer primary stator structure 13 which are matched with the secondary mover structure and contain energized windings are connected together through a connecting shaft and a bearing assembly.
The axial direction is defined as the tangential direction of the surface of the back iron 5 or the movement direction of the secondary mover structure 15, and the radial direction is defined as the normal direction of the surface of the back iron 5 or the direction perpendicular to the axial direction.
As shown in fig. 3, the surface of the weak magnetic area of the salient pole halbach array is adhered to the magnetic or non-magnetic back iron 5.
In the salient pole halbach array, the axial sections of the radial magnetizing permanent magnet 4 and the axial magnetizing permanent magnet 3 are respectively conical pentagons and trapezoids, the section size ratio is as shown in fig. 8, and the two permanent magnets are alternately stuck and arranged through an adhesive as shown in fig. 7.
As shown in FIG. 3, the salient pole halbach arrays are respectively stuck to two sides of the inner air gap and the outer air gap of the secondary back iron 5, and the two salient pole halbach arrays are in mirror symmetry about the axial center line of the back iron. Wherein the magnetization directions of the conical pentagon permanent magnets are opposite, and the magnetization directions of the trapezoidal permanent magnets are the same.
As shown in fig. 4, a plurality of air cavities 6 with rectangular cross sections are reserved in the middle of the back iron 5, the axial sides are correspondingly equal to the long bottom edges of the trapezoidal magnets, the axial air cavities are equally spaced, and the length of one long bottom edge of the trapezoid is the length of the long bottom edge of the trapezoid.
As shown in fig. 10, on the inner primary stator structure 14 and the outer primary stator structure 13 of the motor, a certain number of slots are formed on the outer primary core 1 and the inner primary core 7 according to the pole slots in the motor design and the fit on the side close to the secondary mover structure 15; the pancake windings are embedded in the motor and connected according to a certain rule to form the motor primary. The pancake winding embedded in the groove of the outer primary iron core 1 is the outer primary winding 2, and the pancake winding embedded in the groove of the inner primary iron core 7 is the inner primary winding 10.
As shown in fig. 11-14, a cylindrical secondary mover of a salient pole halbach permanent magnet array is placed between two cylindrical primary stators, and the three are combined by using a connecting shaft, a bearing, a fixing device and the like to form the cylindrical double-stator salient pole permanent magnet linear motor based on the halbach array.
The salient pole halbach array of the linear motor of this embodiment is significantly different from the general halbach permanent magnet array structure shown in fig. 5 and 6.
Although the embodiments of the present invention are described above, the present invention is not limited to the embodiments adopted for the purpose of facilitating understanding of the technical aspects of the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the core technical solution disclosed in the present invention, but the scope of protection defined by the present invention is still subject to the scope defined by the appended claims.
Claims (6)
1. A cylindrical double-stator salient pole permanent magnet linear motor based on halbach arrays is characterized in that: the stator comprises an inner primary stator structure (14), an outer primary stator structure (13) and a secondary rotor structure (15) matched with the inner primary stator structure and the outer primary stator structure, wherein an inner air gap (9) is formed between the inner primary stator structure (14) and the secondary rotor structure (15), and an outer air gap (8) is formed between the outer primary stator structure (13) and the secondary rotor structure (15);
the secondary rotor structure (15) is a salient pole halbach array, and comprises an inner layer salient pole halbach array (11) and an outer layer salient pole halbach array (12), wherein the radial magnetizing permanent magnets (4) and the axial magnetizing permanent magnets (3) are mutually and closely arranged to form the salient pole halbach array, the salient pole halbach array which is closely attached to an inner layer air gap (9) and is positioned on the surface of a back iron (5) of the secondary rotor structure (15) forms the inner layer salient pole halbach array, and the salient pole halbach array which is closely attached to an outer layer air gap (8) and is positioned on the surface of the back iron (5) of the secondary rotor structure (15) forms the outer layer salient pole halbach array; the secondary rotor structure (15) of the salient pole halbach array, the inner primary stator structure (14) and the outer primary stator structure (13) which are matched with the secondary rotor structure and contain energized windings form a cylindrical double-stator salient pole permanent magnet linear motor based on the halbach array;
a plurality of air cavities (6) with rectangular cross sections are formed in the middle of the back iron (5), the width of each air cavity (6) is equal to the length bottom edge of the axial magnetizing permanent magnet (3) with the trapezoidal cross section, the intervals of the axial air cavities (6) are equal, and the interval distance is the side length of the length bottom edge of the axial magnetizing permanent magnet (3) with the trapezoidal cross section.
2. The halbach array-based cylindrical double-stator salient pole permanent magnet linear motor as claimed in claim 1, wherein: radial magnetizing permanent magnets (4) with conical pentagons in cross section and axial magnetizing permanent magnets (3) with trapezoidal cross section are alternately and closely arranged to form a salient pole halbach array.
3. The halbach array-based cylindrical double-stator salient pole permanent magnet linear motor as claimed in claim 2, wherein: salient pole halbach arrays on two sides of the back iron (5) are in mirror symmetry with respect to an axial center plane of the back iron (5), wherein magnetizing directions of two symmetrical radial magnetizing permanent magnets (4) are opposite, and magnetizing directions of the two symmetrical axial magnetizing permanent magnets (3) are the same.
4. A cylindrical double-stator salient permanent magnet linear motor based on halbach array as claimed in claim 3, wherein: the salient pole halbach array surrounds a longitudinal axis and is formed by rolling the two transverse ends of the salient pole composite array into a cylinder shape in an end-to-end mode.
5. The halbach array-based cylindrical double-stator salient pole permanent magnet linear motor as claimed in claim 1, wherein: the inner primary stator structure (14) and the outer primary stator structure (13) are provided with a certain number of slots on one side close to the secondary rotor structure (15), and pancake windings are embedded in the slots and connected.
6. The halbach array-based cylindrical double-stator salient pole permanent magnet linear motor as claimed in claim 5, wherein: the secondary rotor structure (15) of the salient pole halbach array is connected with the inner primary stator structure (14) and the outer primary stator structure (13) which are matched with the secondary rotor structure and contain energized windings through connecting shafts and bearing assemblies.
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| CN201810442938.7A CN108462358B (en) | 2018-05-10 | 2018-05-10 | Cylindrical double-stator salient pole permanent magnet linear motor based on halbach array |
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| CN201810442938.7A CN108462358B (en) | 2018-05-10 | 2018-05-10 | Cylindrical double-stator salient pole permanent magnet linear motor based on halbach array |
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| CN108462358B true CN108462358B (en) | 2023-11-10 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109274241A (en) * | 2018-11-09 | 2019-01-25 | 东南大学 | A kind of not wide halbach array axial stator iron-core less motor |
| CN109361305A (en) * | 2018-12-12 | 2019-02-19 | 宋局 | A kind of structure of Dual-conjugate bar type linear motor |
| CN113629972B (en) * | 2020-05-08 | 2022-05-27 | 河北国创石油设备有限公司 | Rotor structure of submersible linear motor power device |
| CN112688524A (en) * | 2020-12-10 | 2021-04-20 | 山东大学 | Double-stator split-tooth type cylindrical linear motor |
| CN114665645B (en) * | 2022-04-06 | 2024-01-23 | 上海交通大学 | Slotless cylindrical linear motor |
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