Double-sided permanent magnet linear motor
By setting multiple permanent magnets and chamfered structures in a double-sided permanent magnet linear motor to form an alternating excitation source, the problem of insufficient thrust in traditional linear motors is solved, achieving high thrust density and stable operation in a limited space.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU SEIDAL INTELLIGENT TECH CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-07-03
AI Technical Summary
The limited space in the mover structure of traditional linear motors results in an insufficient number of permanent magnets, leading to insufficient thrust and making it unsuitable for high-thrust applications.
A double-sided permanent magnet linear motor is designed. By setting multiple permanent magnets in the mover and stator structures and setting chamfer structures at the pole shoe and stator teeth, an alternating excitation source is formed, which increases the number and density of excitation sources, optimizes magnetic field modulation, and improves thrust density.
Within a limited structural space, the thrust of the linear motor has been greatly increased, optimizing its performance and improving thrust density and operational stability.
Smart Images
Figure CN224459607U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bilateral permanent magnet linear motor technology, specifically to a bilateral permanent magnet linear motor. Background Technology
[0002] A linear motor is a transmission device that directly converts electrical energy into linear motion mechanical energy without the need for intermediate conversion mechanisms. This makes linear motors more direct and reliable, achieving extremely high motion accuracy; moreover, linear motors use a direct-drive method with no reduction ratio, allowing for higher acceleration and speed. However, in traditional technology, the limited structural space at the mover in a linear motor restricts the number of permanent magnets that can be assembled, easily leading to insufficient thrust and making it unsuitable for high-thrust applications. Utility Model Content
[0003] The main purpose of this invention is to propose a double-sided permanent magnet linear motor, which aims to solve the problem of insufficient thrust in traditional linear motors.
[0004] To achieve the above objectives, this utility model proposes a double-sided permanent magnet linear motor, comprising:
[0005] A mover structure includes a mover yoke and a plurality of mover units arranged sequentially along a transverse direction. Each mover unit includes a mover tooth, a winding, a pole shoe, and a first permanent magnet. The mover tooth protrudes from one vertical end of the mover yoke, the winding surrounds the periphery of the mover tooth, and a first mounting groove is formed at one vertical end of the pole shoe. The first permanent magnet is fixedly mounted in the first mounting groove.
[0006] The stator structure includes a stator yoke, a plurality of stator teeth arranged in a transverse direction, and a plurality of second permanent magnets. The stator teeth protrude from one vertical end of the stator yoke, and a second mounting groove is defined between every two adjacent stator teeth. The second permanent magnets are fixedly mounted in the second mounting grooves.
[0007] The pole shoe is provided with a first chamfer structure at each edge on its outer side and at each edge on the first mounting groove at its opening; the stator tooth is provided with a second chamfer structure at each edge.
[0008] Optionally, the main magnetic flux of the first permanent magnet is located within the leakage magnetic flux of the second permanent magnet; and,
[0009] The main magnetic flux of the second permanent magnet is located within the leakage magnetic flux of the first permanent magnet.
[0010] Optionally, if the vertical central axis of the moving subunit is T0 and the vertical central axis of the first permanent magnet is T1, then the central axis T0 and the central axis T1 are collinear.
[0011] Optionally, the first permanent magnet at the first mounting slot is configured as a single magnet; or...
[0012] The first permanent magnet at the first mounting slot is configured as a plurality of the first permanent magnets, and each of the first permanent magnets is arranged sequentially according to the Heilbeck array.
[0013] Optionally, the second permanent magnet at the second mounting slot is configured as a single magnet; or,
[0014] The second permanent magnet at the second mounting slot is configured as a plurality of the second permanent magnets, and each of the second permanent magnets is arranged sequentially according to the Heilbeck array.
[0015] Optionally, the bilateral permanent magnet linear motor further includes a third permanent magnet;
[0016] The third permanent magnet can be selectively placed or filled in the recessed portion of each of the first chamfered structures or each of the second chamfered structures.
[0017] Optionally, the third permanent magnet fills the corresponding recessed portion of the first chamfered structure or the second chamfered structure; or,
[0018] The third permanent magnet is partially filled in the recessed portion of the corresponding first chamfered structure or second chamfered structure; or...
[0019] The third permanent magnet fills the corresponding recessed portion of the first chamfered structure or the second chamfered structure, and partially protrudes from the corresponding recessed portion of the first chamfered structure or the second chamfered structure.
[0020] Optionally, the chamfer type of the first chamfer structure or the second chamfer structure includes an arc chamfer, a rectangular chamfer, a bevel chamfer, or a multi-level polygonal chamfer.
[0021] Optionally, the first chamfer structure disposed on each edge of the outer side of the pole shoe is the same as the first chamfer structure disposed on each edge of the first mounting groove at its opening; or,
[0022] The first chamfer structure located on each edge of the outer side of the pole shoe is different from the first chamfer structure located on each edge of the first mounting groove at its opening.
[0023] Optionally, each of the moving parts is respectively disposed at both ends of the vertical part of the moving part yoke;
[0024] The stator structure is provided in two parts, and the two stator structures are adapted to be respectively disposed at the vertical ends of the mover unit at the mover yoke.
[0025] In the technical solution provided by this utility model, the first permanent magnet located at the mover structure and the second permanent magnet located at the stator structure can simultaneously provide alternating excitation to the mover structure, thus constituting excitation sources. The stator teeth on the stator structure can modulate the magnetic field of the mover structure. The two sets of excitation sources formed can generate an alternating magnetic field in the windings, thereby generating a lateral thrust when current is applied to the windings. In this way, as many excitation sources as possible can be added within a limited structural space, greatly increasing the overall thrust density of the linear motor, thereby ultimately helping to increase the overall thrust of the linear motor and optimize its overall performance. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0027] Figure 1 A perspective view of the first embodiment of the double-sided permanent magnet linear motor provided by this utility model;
[0028] Figure 2 for Figure 1 A schematic diagram of the first embodiment of the stator structure and the intermediate rotor structure;
[0029] Figures 3 to 15 for Figure 1 Schematic diagrams of some embodiments of the central moving part structure;
[0030] Figures 16 to 20 for Figure 1 Schematic diagrams of some embodiments of the middle stator structure;
[0031] Figure 21 A perspective view of a second embodiment of the bilateral permanent magnet linear motor provided by this utility model;
[0032] Figures 22 to 23 This is a schematic diagram illustrating the relationship between back electromotive force and cogging force in a dual-sided permanent magnet linear motor in the prior art.
[0033] Figures 24 to 25 For Figure 8 A schematic diagram showing the relationship between back electromotive force and cogging force in a double-sided permanent magnet linear motor with a central drive structure as an example.
[0034] Explanation of icon numbers:
[0035] 100 Moving element structure; 110 Moving element yoke; 120 Moving element unit; 121 Moving element tooth; 122 Winding; 123 Pole shoe; 124 First mounting slot; 125 First permanent magnet; 126 First chamfer structure; 200 Stator structure; 210 Stator yoke; 220 Stator tooth; 221 Second mounting slot; 222 Second chamfer structure; 230 Second permanent magnet; 300 Third permanent magnet.
[0036] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0038] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0039] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0040] Please see Figures 1 to 23This utility model provides a double-sided permanent magnet linear motor. It should be noted that, for ease of understanding, the following embodiments are all described using the example of a double-sided permanent magnet linear motor having two roughly perpendicular vertical, horizontal, and longitudinal axes.
[0041] Specifically, the bilateral permanent magnet linear motor includes a mover structure 100 and a stator structure 200.
[0042] The mover structure 100 includes a mover yoke 110 and multiple mover units 120. Each mover unit 120 includes a mover tooth 121, a winding 122, a pole shoe 123, and a first permanent magnet 125. The mover tooth 121 protrudes from one vertical end of the mover yoke 110. The winding 122 surrounds the periphery of the mover tooth 121. A first mounting groove 124 is formed at one vertical end of the pole shoe 123. The first permanent magnet 125 is fixedly mounted in the first mounting groove 124.
[0043] The stator structure 200 includes a stator yoke 210, a plurality of stator teeth 220 arranged sequentially in the transverse direction, and a plurality of second permanent magnets 230. The stator teeth 220 protrude from one vertical end of the stator yoke 210. A second mounting groove 221 is defined between every two adjacent stator teeth 220. The second permanent magnets 230 are fixedly mounted in the second mounting grooves 221.
[0044] The pole shoe portion 123 has a first chamfer structure 126 on each of its outer edges and on each of the edges of the first mounting groove 124 at its opening. The stator tooth portion 220 has a second chamfer structure 222 on each of its edges.
[0045] In the technical solution provided by this utility model, the first permanent magnet 125 provided at the mover structure 100 and the second permanent magnet 230 provided at the stator structure 200 can simultaneously provide alternating excitation to the mover structure 100, thus constituting excitation sources. The stator teeth 220 on the stator structure 200 can modulate the magnetic field of the mover structure 100. The two sets of excitation sources formed can generate an alternating magnetic field in the winding 122, thereby generating a lateral thrust when current is applied to the winding 122. In this way, as many excitation sources as possible can be added within a limited structural space, which greatly increases the overall thrust density of the double-sided permanent magnet linear motor, thereby ultimately helping to increase the overall thrust of the double-sided permanent magnet linear motor and optimize its overall performance.
[0046] Specifically, the moving yoke 110 extends elongatedly in the transverse direction. Multiple moving units 120 are sequentially and spaced apart at one vertical end of the moving yoke 110. The spacing between any two adjacent moving units 120 can be set to be substantially the same. Alternatively, the spacing between any two adjacent moving units 120 can be at least partially different.
[0047] Similarly, the structures of each moving sub-unit 120 can be set to be basically the same. Alternatively, depending on actual needs, the structures of at least two moving sub-units 120 can be set to be different.
[0048] The moving yoke 110 is generally configured as a single integral structure extending laterally. Alternatively, the moving yoke 110 may be configured as being composed of multiple individual structures, with each individual structure corresponding to each moving unit 120. Alternatively, each individual structure may correspond to at least two moving units 120.
[0049] The moving part 121 protrudes from one vertical end of the moving part yoke 110. The moving part 121 extends generally in a vertically elongated shape. The winding 122 is formed by wrapping around the periphery of the moving part 121. The winding 122 has a lead-out section. The lead-out section of the winding 122 is used for electrical connection with an external power source, so that the winding 122 has an energized state and a de-energized state.
[0050] The pole shoe portion 123 protrudes from the end of the mover tooth portion 121 away from the mover yoke portion 110. It should be noted that the pole shoe portion 123 and the mover tooth portion 121 can be integrally formed. Alternatively, the pole shoe portion 123 and the mover tooth portion 121 can be obtained by detachable or non-detachable connection after separate forming.
[0051] The pole shoe portion 123 has a first mounting groove 124 at one end that is vertically away from the moving part tooth portion 121. The number of first mounting grooves 124 can be one or at least two.
[0052] When there is only one mounting slot, the first mounting slot 124 is generally centered laterally at the pole shoe portion 123. Specifically, for example, when the moving subunit 120 has a vertical central axis T0 and the first mounting slot 124 has a vertical central axis T1, the central axes T0 and T1 are substantially collinear. That is, the central axes T0 and T1 can be completely collinear. Alternatively, the central axes T0 and T1 can be parallel to each other, and the distance between them is within a preset deviation range.
[0053] When the number of first mounting slots 124 is at least two, each first mounting slot 124 is generally symmetrically arranged about the central axis T0.
[0054] The number, size, and shape of the first permanent magnet 125 are all adapted to the first mounting groove 124 to which it is assembled. This allows the first permanent magnet 125 to be completely embedded in the pole shoe portion 123. Correspondingly, the central axis of the first permanent magnet 125 extending vertically is also T1.
[0055] After the first permanent magnet 125 is assembled into the first mounting slot 124, the end surface of the first permanent magnet 125 can be approximately flush with the opening of the first mounting slot 124.
[0056] Similarly, the stator yoke 210 extends generally in a long shape along the transverse direction. At least two stator teeth 220 are arranged sequentially along the transverse direction. Each stator tooth 220 protrudes from the end of the stator yoke 210 facing the stator structure 200. Every two adjacent stator teeth 220 and the stator yoke 210 together define a second mounting groove 221. The second permanent magnet 230 can be mounted in the second mounting groove 221.
[0057] It should be noted that this design is not limited to each second mounting slot 221 having a second permanent magnet 230. Depending on actual needs, each second mounting slot 221 is naturally defined by two adjacent stator teeth 220, and can be selectively left empty. Alternatively, it can be selectively provided with one or at least two second permanent magnets 230.
[0058] When the second permanent magnet 230 needs to be assembled, the shape and size of the second permanent magnet 230 can be adapted to the second mounting groove 221 to which it is assembled, so that the second permanent magnet 230 completely fills the second mounting groove 221.
[0059] Alternatively, the width of the second permanent magnet 230 in the lateral direction is smaller than the width of the second mounting groove 221 in the lateral direction. In this way, gaps can be defined between the outer walls of the two lateral sides of the second permanent magnet 230 and the corresponding side walls of the second mounting groove 221. These gaps help to significantly reduce cogging effects. This, in turn, reduces eddy current losses and core losses to a certain extent, thereby preventing overheating problems that may occur under high-speed or high-load conditions.
[0060] Alternatively, in the direction near the mover structure 100, the transverse side walls of the second mounting groove 221 extend at an angle away from each other. This allows the width of the gap, as described above, on both transverse sides of the second permanent magnet 230 to gradually increase, and allows it to connect with the second chamfer structure 222. Of course, the above does not constitute a limitation on the specific structure of the second mounting groove 221 and the stator teeth 220.
[0061] In practical applications, optionally, the end surface of the second permanent magnet 230 can be specifically configured to be no higher than the opening of the second mounting groove 221. This ensures that the protrusion height of the stator tooth portion 220 relative to the stator yoke portion 210 is not less than the protrusion height of the second permanent magnet 230 relative to the stator yoke portion 210. Of course, in other embodiments, the end surface of the second permanent magnet 230 can also be specifically configured to be higher than the opening of the second mounting groove 221 according to actual needs.
[0062] The specific orientations of the first permanent magnet 125 / first mounting slot 124 and the second permanent magnet 230 / second mounting slot 221 are not limited, but it can be understood that the main magnetic flux of the first permanent magnet 125 is located within the leakage magnetic flux of the second permanent magnet 230, and vice versa. This allows for a strong magnetic focusing effect between the first permanent magnet 125 and the second permanent magnet 230. The first permanent magnet 125 and the second permanent magnet 230 can form an extremely high magnetic circuit operating point. This, in turn, significantly increases the thrust density of the mover structure 100, greatly improving the overall performance of the bilateral permanent magnet linear motor.
[0063] In practical applications, optionally, the vertically projected area of the first permanent magnet 125 is not less than the vertically projected area of the second permanent magnet 230. That is, the lateral dimension of a single first permanent magnet 125 is not less than the lateral dimension of a single second permanent magnet 230. Of course, in other embodiments, the vertically projected area of the first permanent magnet 125 can also be set to be smaller than the vertically projected area of the second permanent magnet 230, depending on actual needs.
[0064] Regarding the design of the first chamfer structure 126 and the second chamfer structure 222, such as Figure 2 As indicated by the dashed circle, the first chamfer structure 126 and the second chamfer structure 222 generally extend longitudinally. That is, the first chamfer structure 126 and the second chamfer structure 222 are generally located at the edges extending longitudinally. The specific number of first chamfer structures 126 is related to the shape of the pole shoe portion 123, the shape of the first mounting groove 124, etc. Similarly, the specific number of second chamfer structures 222 is related to the shape of the stator tooth portion 220, etc.
[0065] like Figures 2 to 20 The structure shown is as follows:
[0066] When the pole shoe portion 123 is approximately hexahedral in shape (e.g., cuboid or cube), the outer side of the pole shoe portion 123 may have approximately two edges for the first chamfer structure 126. When the first mounting groove 124 is approximately square, it has approximately two edges at the groove opening. Therefore, for a single moving sub-unit 120, the number of first chamfer structures 126 formed on it is approximately six.
[0067] When the stator tooth portion 220 is approximately hexahedral in shape (e.g., cuboid or cube), the outer side of the stator tooth portion 220 can have approximately two edges of the second chamfer structure 222. Therefore, for a single moving unit 120 and a single stator tooth portion 220, the total number of the first chamfer structure 126 and the second chamfer structure 222 is approximately eight.
[0068] The chamfer type of each of the first chamfer structure 126 or the second chamfer structure 222 described above is not limited. For example, in terms of shape, the chamfer type can be, but is not limited to, an arc chamfer, a rectangular chamfer, a bevel chamfer, or a multi-order polygonal chamfer. The specific dimensional parameters of the first chamfer structures 126 with the same shape can be set the same or different.
[0069] For example, when both are set as rounded chamfers, their curvature can be set to be the same or different according to actual needs. When both are set as beveled chamfers, the angle of inclination can also be set to be the same or different according to actual needs. Specifically, for example, it can be set to 30°, 45°, 60°, or others. When both are set as multi-level polygonal chamfers, the number of steps, the shape and size of each step of different first chamfer structures 126 or second chamfer structures 222 can all be set to be the same or different according to actual needs. The polygons can be, but are not limited to, regular polygons or any suitable irregular shape.
[0070] For example Figures 3 to 20 As shown, the chamfer types of each first chamfer structure 126 in the same moving sub-unit 120 can be set to the same value. Alternatively, at least two of the first chamfer structures 126 in the same moving sub-unit 120 can have different chamfer types.
[0071] Specifically, for example, in the same moving sub-unit 120, the first chamfer structures 126 provided on the outer edge of the pole shoe portion 123 and the first chamfer structures 126 provided at the opening of the first mounting groove 124 can be the same or different.
[0072] However, it is understandable that when the moving subunit 120 is defined to have a vertically extending central axis T0, generally, the two first chamfer structures 126 provided at corresponding positions on the pole shoe portion 123 are symmetrical about the central axis T0. For example, the two first chamfer structures 126 located on the outer side of the pole shoe portion 123 and vertically close to the winding 122 are generally symmetrically arranged about the central axis. Or, for example, the two first chamfer structures 126 located at the openings of the two first mounting slots 124 and laterally separated from each other are generally symmetrically arranged about the central axis.
[0073] Similarly, the chamfer types of each second chamfer structure 222 of the same stator structure 200 can be set to the same value. Alternatively, at least two of the second chamfer structures 222 of the same stator structure 200 can have different chamfer types. However, it is understood that the chamfer types of the two second chamfer structures 222 opened at the same stator tooth 220 are generally set to the same value and are symmetrically arranged.
[0074] The aforementioned first chamfer structure 126 and second chamfer structure 222 enable the stator structure 200 to modulate the magnetic field of the mover structure 100 more smoothly, thereby making the thrust generated by the magnetic field more stable. This helps reduce thrust fluctuations and improve the stability of the mover structure 100 during displacement.
[0075] Based on one or more of the above embodiments, it can be understood that the moving unit 120 also includes a third permanent magnet 300. The recessed portion of each first chamfer structure 126 and / or second chamfer structure 222 can be selectively left empty or filled with a third permanent magnet 300. That is, depending on actual needs, of the above-mentioned, for example, six first chamfer structures 126 and two second chamfer structures 222, all first chamfer structures 126 or second chamfer structures 222 can be left empty. Alternatively, at least one of the six first chamfer structures 126 or two second chamfer structures 222 can be filled with a third permanent magnet 300. The third permanent magnet 300 can be used as an auxiliary to further enhance the magnetic focusing effect, ultimately improving the overall performance of the bilateral permanent magnet linear motor. The permeability of the third permanent magnet 300 is set to be approximately the same as the permeability of air. Thus, by filling the recessed parts of one or more first chamfered structures 126 or second chamfered structures 222 with a third permanent magnet 300, the thrust stability of each first chamfered structure 126 or second chamfered structure 222 itself will not be adversely affected.
[0076] It should be noted that the size, shape, etc., of the third permanent magnet 300 and the first chamfered structure 126 and / or the second chamfered structure 222 can be set to be the same as or different from those required by actual needs. Furthermore, there are no restrictions on the arrangement of the third permanent magnet 300 within any of the first chamfered structures 126 and / or the second chamfered structures 222.
[0077] For example, the third permanent magnet 300 can perfectly fill the first chamfered structure 126 and / or the second chamfered structure 222. That is, the shape and size of the third permanent magnet 300 are exactly matched with the shape and size of the first chamfered structure 126 and / or the second chamfered structure 222.
[0078] Alternatively, the third permanent magnet 300 may be smaller than the first chamfered structure 126 and / or the second chamfered structure 222, such that the third permanent magnet 300 partially fills within the first chamfered structure 126 and / or the second chamfered structure 222. In this case, the third permanent magnet 300 may be slightly smaller than the dimensions of the first chamfered structure 126 and / or the second chamfered structure 222. Alternatively, the third permanent magnet 300 may have a different shape than the first chamfered structure 126 and / or the second chamfered structure 222, resulting in the first chamfered structure 126 and / or the second chamfered structure 222 being partially filled, with the remaining portion left empty.
[0079] Alternatively, the third permanent magnet 300 may be larger than the first chamfered structure 126 and / or the second chamfered structure 222. In this case, the third permanent magnet 300 may also be larger than the size of the first chamfered structure 126 and / or the second chamfered structure 222. Alternatively, the third permanent magnet 300 may have a different shape than the first chamfered structure 126 and / or the second chamfered structure 222. All of the above can make the third permanent magnet 300 not only fill the first chamfered structure 126 and / or the second chamfered structure 222, but also partially protrude outward from the first chamfered structure 126 and / or the second chamfered structure 222.
[0080] It should be noted that when a third permanent magnet 300 is filled in at least one first chamfer structure 126 and at least one second chamfer structure 222, the third permanent magnet 300 set in the first chamfer structure 126 and the third permanent magnet 300 set in the second chamfer structure 222 can be set in the same way or set differently according to actual needs.
[0081] The moving yoke 110, moving tooth 121, pole shoe 123, stator yoke 210, and stator tooth 220 described above can all be made of soft magnetic materials. Examples of soft magnetic materials include silicon steel sheets, soft magnetic ferrites, and amorphous alloys. The winding 122 is generally made of copper core enameled wire. The first permanent magnet 125 and the second permanent magnet 230 described above can be made of permanent magnetic materials.
[0082] In addition, such as Figure 1 As shown, each of the moving units 120 in the moving unit structure 100 can be evenly distributed at the same vertical end of the moving unit yoke 110. At this time, the stator structure 200 is adapted to the moving unit structure 100 as one, and is located at a position where the moving unit 120 is vertically away from the moving unit yoke 110.
[0083] Or such as Figure 21As shown, each mover unit 120 is correspondingly located at both ends of the mover yoke 110. The two sets of mover units 120 share the same mover yoke 110. In this case, the stator structure 200 is adapted to the mover structure 100 as two separate units, located vertically away from the mover yoke 110 from the two sets of mover units 120, forming a single-motor, double-stator combination. This combination can generate double the thrust while helping to eliminate the unilateral magnetic attraction force on the mover structure 100.
[0084] Figure 22 A schematic diagram showing the relationship between back electromotive force and cogging force in a prior art bilateral permanent magnet linear motor (i.e., a bilateral permanent magnet linear motor without the first chamfer structure 126 and the second chamfer structure 222). Figure 23 This utility model provides a specific example of what it offers. Figure 8 The diagram illustrates the relationship between back electromotive force and cogging force in a dual-sided permanent magnet linear motor, exemplified by this invention. It is evident that the solution provided by this invention allows for smoother modulation of the magnetic field of the stator structure 200 on the mover structure 100, resulting in a smoother thrust between the two, ultimately helping to reduce thrust fluctuations and improve operational stability.
[0085] In summary, the double-sided permanent magnet linear motor provided by this utility model has extremely high thrust (thanks to the arrangement between the first permanent magnet 125 and the second permanent magnet 230, and the filling of the third permanent magnet 300) and stable thrust (thanks to the design of the orientation and number of the first chamfer structure 126 and the second chamfer structure 222).
[0086] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A double-sided permanent magnet linear motor, characterized by, include: A mover structure includes a mover yoke and a plurality of mover units arranged sequentially along a transverse direction. Each mover unit includes a mover tooth, a winding, a pole shoe, and a first permanent magnet. The mover tooth protrudes from one vertical end of the mover yoke, the winding surrounds the periphery of the mover tooth, and a first mounting groove is formed at one vertical end of the pole shoe. The first permanent magnet is fixedly mounted in the first mounting groove. The stator structure includes a stator yoke, a plurality of stator teeth arranged in a transverse direction, and a plurality of second permanent magnets. The stator teeth protrude from one vertical end of the stator yoke, and a second mounting groove is defined between every two adjacent stator teeth. The second permanent magnets are fixedly mounted in the second mounting grooves. The pole shoe is provided with a first chamfer structure at each edge on its outer side and at each edge on the first mounting groove at its opening; the stator tooth is provided with a second chamfer structure at each edge.
2. The double-sided permanent magnet linear motor of claim 1, wherein, The main magnetic flux of the first permanent magnet is located within the leakage magnetic flux of the second permanent magnet; and, The main magnetic flux of the second permanent magnet is located within the leakage magnetic flux of the first permanent magnet.
3. The double-sided permanent magnet linear motor of claim 1, wherein, The vertical central axis of the moving subunit is T0, and the vertical central axis of the first permanent magnet is T1. Therefore, the central axis T0 and the central axis T1 are collinear.
4. The double-sided permanent magnet linear motor of claim 1, wherein, The first permanent magnet at the first mounting slot is configured as a single entity; or... The first permanent magnet at the first mounting slot is configured as a plurality of the first permanent magnets, and each of the first permanent magnets is arranged sequentially according to the Heilbeck array.
5. The double-sided permanent magnet linear motor of claim 1, wherein, The second permanent magnet at the second mounting slot is configured as one; or, The second permanent magnet at the second mounting slot is configured as a plurality of the second permanent magnets, and each of the second permanent magnets is arranged sequentially according to the Heilbeck array.
6. The double-sided permanent magnet linear motor of claim 1, wherein, The bilateral permanent magnet linear motor also includes a third permanent magnet; The third permanent magnet can be selectively placed or filled in the recessed portion of each of the first chamfered structures or each of the second chamfered structures.
7. The double-sided permanent magnet linear motor of claim 6, wherein, The third permanent magnet fills the corresponding recessed portion of the first or second chamfered structure; or... The third permanent magnet is partially filled in the recessed portion of the corresponding first chamfered structure or second chamfered structure; or... The third permanent magnet fills the corresponding recessed portion of the first chamfered structure or the second chamfered structure, and partially protrudes from the corresponding recessed portion of the first chamfered structure or the second chamfered structure.
8. The double-sided permanent magnet linear motor of claim 1, wherein, The chamfer type of the first chamfer structure or the second chamfer structure includes arc chamfer, rectangular chamfer, bevel chamfer or multi-level polygon chamfer.
9. The double-sided permanent magnet linear motor of claim 1, wherein, The first chamfer structure provided at each edge on the outer side of the pole shoe is the same as the first chamfer structure provided at each edge of the first mounting groove at its opening; or, The first chamfer structure located on each edge of the outer side of the pole shoe is different from the first chamfer structure located on each edge of the first mounting groove at its opening.
10. The double-sided permanent magnet linear motor of claim 1, wherein, Each of the aforementioned moving parts is correspondingly disposed at both ends of the vertical axis of the moving part yoke; The stator structure is provided in two parts, and the two stator structures are adapted to be respectively disposed at the vertical ends of the mover unit at the mover yoke.