A ring-closed magnetic circuit assembly, a permanent magnet cylindrical linear motor and a generator

Abstract

The application discloses a kind of annular closed magnetic circuit components, permanent magnet cylindrical linear motor and generator.The annular closed magnetic circuit components include multiple strip-shaped mover magnets, magnet fixing device, multiple stator coils and coil fixing device;Multiple the strip-shaped mover magnets are evenly spaced and arranged along the outer side circumference of the magnet fixing device away from the center of circle;Each stator coil is arranged between two adjacent strip-shaped mover magnets;And each stator coil is evenly spaced and arranged on the inner side circumference of the coil fixing device close to the center of circle.The scheme improves the main magnetic flux, efficiency and power density of permanent magnet cylindrical linear motor and permanent magnet cylindrical linear generator through annular closed magnetic circuit components, the permanent magnet field is fully utilized, and the leakage flux and the amount of permanent magnet material are reduced.

Description

Technical Field

[0001] This invention relates to the field of magnetic field technology, and in particular to a ring-shaped closed magnetic circuit assembly, a permanent magnet cylindrical linear motor, and a generator. Background Technology

[0002] Currently, the magnetic circuit design of cylindrical linear motors or generators mainly covers three forms: axial flux, radial flux, and hybrid flux. Although these structures each have their advantages, their performance is still insufficient in applications that require high thrust density and high power density (such as drones and other aircraft applications). Specifically, to achieve high performance, the system often needs to use a large amount of permanent magnet materials, resulting in high costs. Summary of the Invention

[0003] This invention provides a ring-shaped closed magnetic circuit assembly, a permanent magnet cylindrical linear motor, and a generator. The ring-shaped magnetic circuit assembly improves the device efficiency and power density.

[0004] To achieve the above objectives, in a first aspect, embodiments of the present invention provide an annular closed magnetic circuit assembly, which includes a plurality of bar moving magnets, a magnet fixing device, a plurality of stator coils and a coil fixing device;

[0005] The plurality of bar-shaped moving magnets are evenly spaced along the outer circumference of the magnet fixing device away from the center; each stator coil is disposed between two adjacent bar-shaped moving magnets; and each stator coil is evenly spaced on the inner circumference of the coil fixing device near the center.

[0006] Optionally, the bar-shaped moving magnet includes at least two magnets along the axial direction; the two magnets include a first magnet and a second magnet; the second magnet is arranged adjacent to the first magnet along the axial direction;

[0007] The first magnet includes a first north pole and a first south pole; the second magnet includes a second north pole and a second south pole; the first north pole and the first south pole are arranged in a clockwise direction; the second north pole and the second south pole are arranged in a counterclockwise direction.

[0008] Optionally, each of the bar magnets is staggered by a predetermined distance in the axial direction;

[0009] And / or, each of the stator coils is offset by a predetermined distance in the axial direction;

[0010] Wherein, the preset distance L satisfies: , Let be the axial width of the first magnet.

[0011] Optionally, the cross-section of the bar magnet in the circumferential surface includes a rectangular structure, a trapezoidal structure, and a square structure;

[0012] And / or, the cross-section of the stator coil in the circumferential plane includes a rectangular structure, a trapezoidal structure, and a square structure.

[0013] Optionally, each of the said bar magnets may be arranged in an even-numbered array or in an odd-numbered array.

[0014] When each of the bar magnets is arranged in an even array, each of the stator coils is arranged in an even array; when each of the bar magnets is arranged in an odd array, each of the stator coils is arranged in an odd array.

[0015] Optionally, the material of the bar magnet includes at least: ferrite magnet, neodymium iron boron magnet and samarium cobalt magnet.

[0016] In a second aspect, embodiments of the present invention provide a permanent magnet cylindrical linear motor, which includes at least the annular closed magnetic circuit assembly described in the first aspect above; the bar moving magnet is used to reciprocate linearly in the axial direction when current is passed through the stator coil.

[0017] Thirdly, embodiments of the present invention provide a permanent magnet cylindrical linear generator, which includes at least the annular closed magnetic circuit assembly described in the first aspect above; the bar moving magnet is used to generate current in the stator coil when it reciprocates linearly along the axial direction under external power.

[0018] In this embodiment of the invention, multiple bar-shaped moving magnets are evenly spaced along the outer circumference of the magnet fixing device away from the center; each stator coil is disposed between two adjacent bar-shaped moving magnets; and each stator coil is evenly spaced on the inner circumference of the coil fixing device near the center. In this way, the multiple bar-shaped moving magnets can generate a closed annular magnetic field on the circumferential surface. When this annular magnetic circuit assembly is applied to a permanent magnet cylindrical linear generator, the multiple bar-shaped moving magnets reciprocate along the axial direction, thereby generating a changing annular magnetic field. This changing annular magnetic field passes through the stator coils, thereby generating a current in the stator coils. Alternatively, when this annular magnetic circuit assembly is applied to a permanent magnet cylindrical linear motor, a magnetic field is generated when current is injected into the stator coil. This magnetic field interacts with the fixed annular magnetic field generated by the bar mover magnet, thereby causing the magnet fixing device to drive the bar mover magnet to reciprocate linearly in the axial direction. Since a annular magnetic field can be generated by the bar mover magnet, the bar mover magnet forms a complete closed annular magnetic circuit, resulting in stronger main magnetic flux and less leakage flux. Thus, when forming a permanent magnet cylindrical linear generator or permanent magnet cylindrical linear motor, the efficiency and power density of the permanent magnet cylindrical linear generator or permanent magnet cylindrical linear motor can be improved.

[0019] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural schematic diagram of a ring-shaped closed magnetic circuit assembly provided in an embodiment of the present invention;

[0022] Figure 2 This is a top view of a ring-shaped closed magnetic circuit assembly provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the annular magnetic field formed by the annular closed magnetic circuit assembly provided in the embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the bar-shaped moving magnet and the magnet fixing device provided in the embodiment of the present invention;

[0025] Figure 5 It is along Figure 1 A schematic diagram of the cross-sectional structure of CC'. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] Figure 1 This is a three-dimensional structural schematic diagram of a ring-shaped closed magnetic circuit assembly provided in an embodiment of the present invention; Figure 2 This is a top view schematic diagram of a ring-shaped closed magnetic circuit assembly provided in an embodiment of the present invention; as shown. Figure 1 and Figure 2 As shown, the annular magnetic circuit assembly includes multiple bar moving magnets 10, a magnet fixing device 20, multiple stator coils 30, and a coil fixing device 40; the multiple bar moving magnets 10 are evenly spaced along the outer circumference of the magnet fixing device 20 away from the center; each stator coil 30 is disposed between two adjacent bar moving magnets 10; and each stator coil 30 is evenly spaced on the inner circumference of the coil fixing device 40 near the center.

[0029] The magnet fixing device 20 serves to support each bar-shaped moving magnet 10. The magnet fixing device 20 can be in any combination, and this embodiment does not limit its form. For example, the magnet fixing device 20 can be a circular magnet support structure, or a combination of a circular magnet support structure and a support structure covering the bar-shaped moving magnet. The coil fixing device 40 serves to support each stator coil 30. The coil fixing device 40 can be in any combination, and this embodiment does not limit its form. For example, the coil fixing device 40 can be a circular coil support structure, or a combination of a circular coil support structure and a support structure covering the stator coil.

[0030] Specifically, multiple bar magnets 10 can generate a ring magnetic field on the circumferential surface. When this ring magnetic circuit assembly is applied to a permanent magnet cylindrical linear generator, the multiple bar magnets 10 reciprocate along the axial direction, generating a changing ring magnetic field. This changing ring magnetic field passes through the stator coil 30, thereby generating a current in the stator coil 30. Alternatively, when this ring magnetic circuit assembly is applied to a permanent magnet cylindrical linear motor, a magnetic field is generated when variable frequency AC current is injected into the stator coil 30. This magnetic field interacts with the fixed ring magnetic field generated by the bar magnets 10, thereby causing the bar magnets 10 to reciprocate linearly in the axial direction.

[0031] In this embodiment of the invention, since the bar magnet 10 can generate a ring-shaped magnetic field, forming a complete closed magnetic circuit, the main magnetic flux is stronger and the leakage magnetic flux is smaller. Thus, when forming a permanent magnet cylindrical linear generator or permanent magnet cylindrical linear motor, the efficiency and power density of the permanent magnet cylindrical linear generator or permanent magnet cylindrical linear motor can be improved (in some embodiments, the power density exceeds 2 kilowatt-hours per kilogram, which can meet the operating requirements of various aircraft); and the permanent magnet material utilization rate of the bar magnet 10 is higher, and the amount of permanent magnet material used for the same power bar magnet 10 is less.

[0032] It should be noted that, Figure 3 This is a schematic diagram of the ring magnetic field formed by the ring closed magnetic circuit assembly provided in the embodiment of the present invention; as shown. Figure 3 As shown, a ring-shaped magnetic field can be generated using the bar magnet 10; the bar magnet 10 forms a complete closed ring magnetic circuit, resulting in a stronger main magnetic flux and less leakage flux; specifically, to verify the stronger main magnetic flux and less leakage flux, this invention... Figure 3 The magnitude of the magnetic flux at each measuring point ①②③④⑤ of the ring-shaped closed magnetic circuit assembly was experimentally verified, and the specific results are shown in Table 1 below.

[0033]

[0034] Referring to Table 1, it is clear that the leakage flux of the middle part ④ on the outer side of the bar magnet in the thickness direction is relatively small, at 80 Gauss; while the main magnetic flux is 5762 Gauss, 6910 Gauss and 7217 Gauss, which are all relatively strong.

[0035] Optional, Figure 4 This is a schematic diagram of the structure of the bar-shaped moving magnet and the magnet fixing device provided in the embodiment of the present invention; as shown. Figure 4 As shown, the bar-shaped moving magnet 10 includes at least two magnets along the axial direction; the two magnets include a first magnet 11 and a second magnet 12; the second magnet 12 and the first magnet 11 are arranged adjacent to each other in the axial direction;

[0036] The first magnet 11 includes a first north pole N1 and a first south pole S1; the second magnet 12 includes a second north pole N2 and a second south pole S2; the first north pole N1 and the first south pole S1 are arranged in a clockwise direction; the second north pole N2 and the second south pole S2 are arranged in a counterclockwise direction.

[0037] Specifically, the first magnet 11 includes a first north pole N1 and a first south pole S1; the second magnet 12 includes a second north pole N2 and a second south pole S2; the first north pole N1 and the first south pole S1 are arranged sequentially in a clockwise direction; the second north pole N2 and the second south pole S2 are arranged sequentially in a counterclockwise direction. In this way, the first north pole N1 and the first south pole S1 on each bar magnet 10 generate a counterclockwise annular magnetic field; while the second north pole N2 and the second south pole S2 on each bar magnet 10 generate a clockwise annular magnetic field. When this annular magnetic circuit assembly is applied to a circumferential linear generator, when the multiple bar magnets 10 reciprocate along the axial direction, they generate changing counterclockwise and clockwise annular magnetic fields that pass through the stator coil 30, thereby generating a closed-loop variable frequency alternating current in the stator coil 30. In addition, the number and arrangement of magnets in the bar moving magnet 10 can be increased or decreased according to actual design needs.

[0038] Optional, Figure 5 It is along Figure 1 A schematic diagram of the cross-sectional structure of CC'; as shown. Figure 5 As shown, each bar magnet 10 is offset by a predetermined distance in the axial direction; and / or, each stator coil 30 is offset by a predetermined distance in the axial direction (not specifically shown); wherein, the predetermined distance L satisfies: , The axial width of the first magnet 11. Since the bar moving magnet 10 and the stator coil 30 are symmetrically arranged circumferentially, appropriately staggering the axial positions of each bar moving magnet 10 or stator coil 30 can effectively reduce the cogging effect, resulting in smoother operation when the annular magnetic circuit assembly forms a cylindrical linear generator or cylindrical linear motor. For example, the preset distance L can satisfy: , The axial width of the first magnet 11 (axial width A is shown in the figure) Figure 4 ).

[0039] Optional, continue to refer to Figure 1 , Figure 2 and Figure 5 The cross-section of the bar magnet 10 in the circumferential plane includes a rectangular structure, a trapezoidal structure, and a square structure. And / or, the cross-section of the stator coil 30 in the circumferential plane includes a rectangular structure, a trapezoidal structure, and a square structure. The cross-section of the bar magnet 10 or the stator coil 30 in the circumferential plane includes a rectangular structure, a trapezoidal structure, and a square structure; this embodiment does not specifically limit this shape.

[0040] Optional, continue to refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Each bar magnet 10 may be arranged in an even-number array or an odd-number array. When each bar magnet 10 is arranged in an even-number array, each stator coil 30 is arranged in an even-number array; when each bar magnet 10 is arranged in an odd-number array, each stator coil 30 is arranged in an odd-number array. Specifically, the number of bar magnets 10 evenly spaced along the outer circumference of the magnet fixing device 20 away from the center can be either odd or even; this embodiment does not limit this. Similarly, when each bar magnet 10 is arranged in an even-number array, each stator coil 30 is arranged in an even-number array; when each bar magnet 10 is arranged in an odd-number array, each stator coil 30 is arranged in an odd-number array; that is, the number of stator coils 30 can be either odd or even; this embodiment does not limit this.

[0041] Optional, continue to refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The bar magnet 10 is made of at least ferrite magnets, neodymium iron boron magnets, and samarium cobalt magnets. In this embodiment, the bar magnet 10 can generate a ring-shaped magnetic field with stronger main magnetic flux and less leakage flux. This improves the efficiency and power density of the cylindrical linear generator or linear motor. Therefore, under the same power conditions, the increased efficiency and power density of the overall circumferential linear generator or linear motor allow for the selection of relatively weaker ferrite magnets. Of course, in some embodiments, the bar magnet 10 can also be made of relatively stronger neodymium iron boron magnets and samarium cobalt magnets.

[0042] Based on the same inventive concept, this embodiment of the invention also provides a permanent magnet cylindrical linear motor, which includes at least the annular closed magnetic circuit assembly described in the above embodiments; and a bar magnet 10 for reciprocating linear motion along the axial direction when a variable frequency alternating current is applied to the stator coil 30. Since this embodiment of the permanent magnet cylindrical linear motor includes the annular closed magnetic circuit assembly described in the above embodiments, it also possesses the beneficial effects of the above embodiments, namely, it can improve the efficiency and power density of the permanent magnet cylindrical linear motor; and the permanent magnet material utilization rate of the bar magnet 10 is higher, requiring less permanent magnet material for the same power output.

[0043] Based on the same inventive concept, this embodiment of the invention also provides a permanent magnet cylindrical linear generator, which includes at least the annular closed magnetic circuit assembly described in the above embodiments; and a bar magnet 10, used to generate frequency-converted alternating current in the stator coil when reciprocating linearly along the axial direction under external power. Since this embodiment of the permanent magnet cylindrical linear generator includes the annular closed magnetic circuit assembly described in the above embodiments, it also possesses the beneficial effects of the above embodiments, namely, it can improve the efficiency and power density of the permanent magnet cylindrical linear generator; and the permanent magnet material utilization rate of the bar magnet 10 is higher, requiring less permanent magnet material for the same power output.

[0044] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A ring-shaped closed magnetic circuit assembly, characterized in that, Multiple bar mover magnets, magnet fixing device, multiple stator coils and coil fixing device; Multiple bar-shaped moving magnets are evenly spaced along the outer circumference of the magnet fixing device away from the center; each stator coil is disposed between two adjacent bar-shaped moving magnets; and each stator coil is evenly spaced on the inner circumference of the coil fixing device near the center; wherein, the multiple bar-shaped moving magnets and the multiple stator coils form a continuous annular closed magnetic circuit on the circumferential surface.

2. The annular closed magnetic circuit assembly according to claim 1, characterized in that, The bar-shaped moving magnet includes at least two magnets along the axial direction; the two magnets include a first magnet and a second magnet; the second magnet is arranged adjacent to the first magnet along the axial direction. The first magnet includes a first north pole and a first south pole; the second magnet includes a second north pole and a second south pole; the first north pole and the first south pole are arranged in a clockwise direction; the second north pole and the second south pole are arranged in a counterclockwise direction.

3. The annular closed magnetic circuit assembly according to claim 2, characterized in that, Each of the described bar magnets is staggered by a predetermined distance in the axial direction; And / or, each of the stator coils is offset by a predetermined distance in the axial direction; Wherein, the preset distance L satisfies: 0 < L ≤ , Let be the axial width of the first magnet.

4. The annular closed magnetic circuit assembly according to claim 1, characterized in that, The cross-section of the bar magnet in the circumferential plane includes rectangular, trapezoidal and square structures; And / or, the cross-section of the stator coil in the circumferential plane includes a rectangular structure, a trapezoidal structure, and a square structure.

5. The annular closed magnetic circuit assembly according to claim 1, characterized in that, Each of the described bar magnets includes an even-numbered array arrangement or an odd-numbered array arrangement; When each of the bar magnets is arranged in an even array, each of the stator coils is arranged in an even array; when each of the bar magnets is arranged in an odd array, each of the stator coils is arranged in an odd array.

6. The annular closed magnetic circuit assembly according to claim 1, characterized in that, The materials of the bar magnet include at least: ferrite magnets, neodymium iron boron magnets, and samarium cobalt magnets.

7. A permanent magnet cylindrical linear motor, characterized in that, It includes at least the annular closed magnetic circuit assembly as described in any one of claims 1-6; the bar moving magnet is used to reciprocate linearly in the axial direction when current is passed through the stator coil.

8. A permanent magnet cylindrical linear generator, characterized in that, It includes at least the annular closed magnetic circuit assembly as described in any one of claims 1-6; the bar mover magnet is used to generate current in the stator coil when it reciprocates linearly in the axial direction under external power.

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