Bilateral transverse flux linear motor

Abstract

The invention provides a double-side transverse flux linear motor which comprises a single-phase primary unit, and the single-phase primary unit comprises a primary winding, a primary permanent magnet and two primary iron cores which are arranged in a staggered manner. Each primary iron core comprises a wide tooth, two narrow teeth located on the left side and the right side of the wide tooth and a magnet yoke connected to the first end of the wide tooth and the first end of each narrow tooth, the primary winding is arranged on the wide teeth of the two primary iron cores in a surrounding mode, and in the same primary iron core, the wide teeth and the two narrow teeth are spaced front and back in the linear motion direction of the primary iron cores. According to the invention, the mutual inductance between the wide teeth and the narrow teeth can be reduced, the induced current caused by the mutual inductance between the wide teeth and the narrow teeth is reduced, the probability of high-temperature burning loss of the primary winding and high-temperature demagnetization of the primary permanent magnet is reduced, and the mutual limitation of the sizes of the wide teeth and the narrow teeth in the same plane is avoided; and on the premise of the same motor performance, the structure of the front-back staggered primary iron core is more compact.

Description

Technical Field

[0001] The invention belongs to the technical field of linear motor design, and in particular relates to a bilateral transverse flux linear motor. Background Art

[0002] In traditional flat-type permanent magnet synchronous linear motors, since the core teeth of the winding slot electric load and magnetic load are located in the same plane, the simultaneous increase of the electric load and magnetic load is limited to a certain extent, which limits the thrust density of the linear motor. However, since the main magnetic flux loop in the flat-type transverse flux linear motor is perpendicular to the direction of motor movement, the electric load and magnetic load of the motor are relatively decoupled in space, and the electric and magnetic loads can be increased at the same time to increase the thrust density of the motor, making the transverse flux linear motor have the advantages of high thrust density and flexible design. For example, the patent document with publication number CN114977718A discloses a primary iron core staggered bilateral flat plate type transverse flux linear motor, including at least one single-phase primary unit and a secondary unit, the secondary unit includes two flat plate units, the single-phase primary unit is located between the two flat plate units, the single-phase primary unit includes a primary iron core, a winding and a primary permanent magnet, a plurality of primary iron cores are provided, the plurality of primary iron cores are divided into two columns and staggered, the windings are wound on the two columns of primary iron cores, the primary iron cores are provided with primary permanent magnets, the flat plate unit includes a secondary iron core and a secondary permanent magnet, the secondary iron core is plate-shaped, and the secondary iron core There is an air gap between the single-phase primary unit and the secondary permanent magnet is arranged on the side of the secondary iron core opposite to the single-phase primary unit. The primary permanent magnet and the secondary permanent magnet are arranged opposite to each other, which can improve the thrust density of the linear motor. Due to the double-sided structure, the normal attraction between the mover and the stator offset each other, greatly reducing the friction loss of the motor mover transmission mechanism. However, the mutual inductance between the wide teeth and narrow teeth of the primary iron core is relatively serious, and when it is necessary to increase its magnetic load and change the size of the wide teeth and narrow teeth, the sizes of the wide teeth and narrow teeth are limited to each other, resulting in a significant increase in the overall size of the primary iron core, which is not conducive to the compact design of the linear motor. Summary of the invention

[0003] Therefore, the present invention provides a bilateral transverse flux linear motor, which can overcome the technical problems in the related art that the mutual inductance between the wide teeth and the narrow teeth in the bilateral transverse flux linear motor is relatively serious, and the sizes of the wide teeth and the narrow teeth are limited to each other when increasing the magnetic load, resulting in an overall increase in the size of the primary iron core, which is not conducive to the compact design of the linear motor.

[0004] In order to solve the above problems, the present invention provides a bilateral transverse flux linear motor, including a single-phase primary unit, the single-phase primary unit including a primary winding, a primary permanent magnet and two primary iron cores arranged alternately, each of the primary iron cores including a wide tooth, two narrow teeth on the left and right sides of the wide tooth, and a yoke connected to the first end of the wide tooth and the first end of each narrow tooth, the primary winding is arranged around the wide teeth of the two primary iron cores, and in the same primary iron core, the wide tooth and the two narrow teeth form a front and rear gap in the linear motion direction of the primary iron core.

[0005] In some embodiments, the bilateral transverse flux linear motor also includes a secondary unit, which includes two oppositely arranged stator magnetic plates and secondary permanent magnets on opposite sides of each of the stator magnetic plates, and the single-phase primary unit is located between the two stator magnetic plates. In the same primary core, the projections of the magnetic yokes on both sides of the wide teeth on any of the stator magnetic plates form a V shape and are mirror images of each other.

[0006] In some embodiments, the matching gap between the two wide teeth and the matching gap between the two narrow teeth of the two primary cores are filled with magnetic isolation layers respectively.

[0007] In some embodiments, the material of the magnetic isolation layer is epoxy resin or cast aluminum; and / or the thickness of the magnetic isolation layer is not less than 1.5 to 2 times of the air gap distance between the single-phase primary unit and the secondary unit.

[0008] In some embodiments, the wide tooth has a first front-to-back symmetry plane perpendicular to the linear motion direction of the primary iron core, a wide tooth shoe is formed at the second end of the wide tooth, the first front-to-back symmetry plane separates the shoe surface of the wide tooth shoe into a first front side area and a first rear side area, a wide tooth magnetic groove is formed on one of the first front side area and the first rear side area, the primary permanent magnet includes a wide tooth permanent magnet, the wide tooth permanent magnet is matched and inlaid in the wide tooth magnetic groove, and after the wide tooth permanent magnet is inlaid and assembled in the wide tooth magnetic groove, the outer end surface of the wide tooth permanent magnet is flush with the shoe surface of the wide tooth shoe; and the narrow tooth has a first front-to-back symmetry plane perpendicular to the A second front-to-back symmetric plane in the linear motion direction of the primary iron core, a narrow tooth shoe is formed at the second end of the narrow tooth, the second front-to-back symmetric plane divides the shoe surface of the narrow tooth shoe into a second front side area and a second rear side area, a narrow tooth magnetic groove is formed on one of the second front side area and the second rear side area, the primary permanent magnet includes a narrow tooth permanent magnet, the narrow tooth permanent magnet is matched and inlaid in the narrow tooth magnetic groove, and after the narrow tooth permanent magnet is inlaid and assembled in the narrow tooth magnetic groove, the outer end surface of the narrow tooth permanent magnet is flush with the shoe surface of the narrow tooth shoe, and the width of the wide tooth shoe and the narrow tooth shoe in the linear motion direction of the primary iron core is equal.

[0009] In some embodiments, the wide-tooth tooth boot has a first front side, a first rear side, a first left side and a first right side, wherein the first left side is parallel to and spaced from the first right side and perpendicular to the first front-to-back symmetry plane, the wide-tooth tooth boot also has a first left-right symmetry plane perpendicular to the first front-to-back symmetry plane, the first left side and the first right side are symmetrical about the first left-right symmetry plane, and projected onto the stator magnetic plate, the first front side includes a middle plane parallel to the first front-to-back symmetry plane and a side inclined plane connected to one end of the middle plane and the first left side or the first right side, the width of the middle plane in a direction parallel to the first front-to-back symmetry plane is BS2, the spacing between the first left side and the first right side is BS3, the spacing between the middle plane of the first front side and the middle plane of the first rear side is BH2, the length of the first left side in the linear motion direction of the primary core is BH3, BS3:BS2=3:1, BH2:BH3=3:2.

[0010] In some embodiments, the narrow-tooth tooth boot has a second front side surface, a second rear side surface, an outer side surface and an inner side surface, wherein the outer side surface is parallel to and spaced apart from the inner side surface and is perpendicular to the second front-to-back symmetry plane. Projected onto the stator magnetic plate, the second front side surface and the second rear side surface both include a parallel plane parallel to the second front-to-back symmetry plane and a connecting inclined plane connected between the parallel plane and the end away from the wide tooth and the outer side surface. The spacing between the outer side surface and the inner side surface is BS1, the width of the connecting inclined plane in a direction parallel to the second front-to-back symmetry plane is BS2, the spacing between the second front side surface and the second rear side surface is BH2, and the length of the outer side surface in the linear motion direction of the primary iron core is BH1, BS1:BS2=3:2, BH2:BH1=3:2.

[0011] In some embodiments, the distance between the first front-to-back symmetry plane and the second front-to-back symmetry plane is half of the width of the wide-tooth shoe in the linear motion direction of the primary core.

[0012] In some embodiments, a plurality of stator magnetic slots are formed on the stator magnetic plate, and a spacing boss is provided between two adjacent stator magnetic slots in the linear motion direction of the primary iron core. Each of the secondary permanent magnets is respectively and one by one embedded and assembled in each of the stator magnetic slots. When each of the secondary permanent magnets is embedded and assembled in the stator magnetic slot, the outer end surface of each of the secondary permanent magnets is flush with the top surface of the spacing boss.

[0013] In some embodiments, the secondary permanent magnet includes a plurality of permanent magnet groups arranged at intervals in front and behind along the linear motion direction of the primary iron core, each of the permanent magnet groups includes a first secondary permanent magnet arranged corresponding to the wide-tooth permanent magnet and two second secondary permanent magnets arranged corresponding to the narrow-tooth permanent magnets, the length, width and thickness of each wide-tooth permanent magnet are respectively equal to those of each first secondary permanent magnet, the length, width and thickness of each narrow-tooth permanent magnet are respectively equal to those of each second secondary permanent magnet, and the length of each spacing boss is equal to that of the first secondary permanent magnet and the second secondary permanent magnet in the linear motion direction of the primary iron core.

[0014] The bilateral transverse flux linear motor provided by the present invention has the following beneficial effects:

[0015] Compared with the structure in the prior art in which the wide teeth and the narrow teeth in the primary iron core are in the same plane, the wide teeth and the narrow teeth in the primary iron core of the present invention are offset front and back in the linear motion direction of the primary iron core, so that the wide teeth and the narrow teeth in the same primary iron core can have a larger spacing, which can help reduce the mutual inductance between the two, which can help reduce the induced current caused by the mutual inductance of the wide teeth and the narrow teeth, thereby reducing the temperature rise of the iron core, and thereby reducing the probability of high-temperature burning of the primary winding and high-temperature demagnetization of the primary permanent magnet. At the same time, the offset between the wide teeth and the narrow teeth in the present invention is also conducive to separately changing the size of the wide teeth and the narrow teeth to meet the adjustment of the magnetic load of the motor, eliminating the mutual limitation of the sizes of the wide teeth and the narrow teeth in the same plane. Under the premise of the same motor performance, the structure of the primary iron core with front and back offset is more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0017] Figure 1 is a front view structural schematic diagram of a bilateral transverse flux linear motor in an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the primary unit in;

[0019] Figure 3 yes Figure 2 Schematic diagram of the three-dimensional structure of the primary unit after removing the super winding;

[0020] Figure 4 yes Figure 2 A schematic diagram of a three-dimensional structure of a primary iron core and a corresponding primary permanent magnet in a primary unit in an assembled state;

[0021] Figure 5 yes Figure 4 Schematic diagram of the structure of the primary iron core and the primary permanent magnet in the exploded state;

[0022] Figure 6 yes Figure 2 A schematic diagram of the three-dimensional structure of a primary iron core in a primary unit;

[0023] Figure 7 yes Figure 2 The projection diagram of the primary core on the stator magnetic plate, with the relevant dimensions of the tooth shoes marked in the figure;

[0024] Figure 8 yes Figure 1 Schematic diagram of the three-dimensional structure of the secondary unit in;

[0025] Fig. 9 yes Figure 8 A schematic diagram of the structure of the secondary unit in a decomposed state;

[0026] Fig.10 yes Figure 1 Schematic diagram of the core magnetic circuit analysis of the bilateral transverse flux linear motor in one position.

[0027] The accompanying drawings are marked as follows:

[0028] 10. Single-phase primary unit; 11. Primary winding; 12. Primary core; 121. Wide teeth; 1210. Wide tooth magnetic slots; 122. Narrow teeth; 1220. Narrow tooth magnetic slots; 123. Yoke; 131. Wide tooth permanent magnet; 132. Narrow tooth permanent magnet; 20. Secondary unit; 21. Stator magnetic plate; 211. Stator magnetic slots; 212. Spacer bosses; 221. First secondary permanent magnet; 222. Second secondary permanent magnet. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0032] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0033] See also Figures 1 to 10 As shown, according to an embodiment of the present invention, there is provided a bilateral transverse flux linear motor, comprising a single-phase primary unit 10, wherein the single-phase primary unit 10 comprises a primary winding 11, a primary permanent magnet (not labeled in the figure) and two primary iron cores 12 arranged alternately with each other, each of the primary iron cores 12 comprises a wide tooth 121, two narrow teeth 122 on the left and right sides of the wide tooth 121 and a yoke 123 connected to a first end of the wide tooth 121 and a first end of each of the narrow teeth 122, wherein the left and right sides take the linear motion direction of the primary iron core 12 as the front-rear direction as an orientation reference, and the primary iron core 12 is arranged in a staggered manner. The secondary winding 11 is arranged around the wide teeth 121 of the two primary cores 12. In the same primary core 12, the wide teeth 121 and the two narrow teeth 122 form a front-to-back interval in the linear motion direction of the primary core 12, that is, the first front-to-back symmetry plane of the wide teeth 121 perpendicular to the linear motion direction of the primary core 12 and the second front-to-back symmetry plane of the narrow teeth 122 perpendicular to the linear motion direction of the primary core 12 are not in the same plane, but form a front-to-back staggered in the linear motion direction of the primary core 12. For details, see Figure 4 As shown, the wide teeth 121 protrude forward or backward for a certain distance along the linear motion direction, thereby realizing the staggered arrangement of the two narrow teeth 122 and the wide teeth 121, and forming a structure similar to the shape of a "mountain" as a whole.

[0034] In this technical solution, compared with the structure in the prior art in which the wide teeth and the narrow teeth in the primary iron core are in the same plane, the wide teeth 121 and the narrow teeth 122 in the primary iron core 12 of the present invention are displaced forward and backward in the linear motion direction of the primary iron core 12, so that the wide teeth 121 and the narrow teeth 122 in the same primary iron core 12 can have a larger spacing, which can help reduce the mutual inductance between the two, which can help reduce the induced current caused by the mutual inductance of the wide teeth 121 and the narrow teeth 122, thereby reducing the temperature rise of the iron core, thereby reducing the probability of high-temperature burning of the primary winding 11 and high-temperature demagnetization of the primary permanent magnet. At the same time, the dislocation between the wide teeth 121 and the narrow teeth 122 in the present invention is also conducive to separately changing the size of the wide teeth 121 and the narrow teeth 122 to meet the adjustment of the motor magnetic load, eliminating the mutual limitation of the sizes of the wide teeth 121 and the narrow teeth 122 in the same plane. Under the premise of the same motor performance, the structure of the primary iron core 12 with front and back dislocation is more compact.

[0035] In some embodiments, the bilateral transverse flux linear motor further includes a secondary unit 20, wherein the secondary unit 20 includes two oppositely disposed stator magnetic plates 21 and secondary permanent magnets on opposite sides of each of the stator magnetic plates 21, and the single-phase primary unit 10 is located between the two stator magnetic plates 21. In the same primary core 12, the projections of the yokes 123 on both sides of the wide teeth 121 on any of the stator magnetic plates 21 form a V shape and are mirror images of each other. For details, see Figure 7 As shown, at this time, the narrow teeth 122 on both sides of the wide teeth 121 also form mirror images of each other. Specifically, the wide teeth 121 have a symmetry plane in the linear motion direction of the primary core 12. At this time, the two magnetic yokes 123 and the narrow teeth 122 are also symmetrical about the symmetry plane, that is, they form the aforementioned mirror images. The aforementioned stator magnetic plate 21 can be made of electrical pure iron or ferromagnetic material with good magnetic conductivity, and is a flat plate structure.

[0036] In some embodiments, the mating gap between the two wide teeth 121 and the mating gap between the two narrow teeth 122 of the two primary cores 12 are respectively filled with a magnetic isolation layer (not shown in the figure and not labeled). Specifically, the thickness of the magnetic isolation layer is not less than 1.5 to 2 times the air gap distance between the single-phase primary unit 10 and the secondary unit 20.

[0037] In this technical solution, by providing a magnetic isolation layer between two primary iron cores 12 in the same single-phase primary unit 10, effective magnetic isolation between two front-to-back adjacent wide teeth 121 and narrow teeth 122 can be achieved.

[0038] The material of the magnetic isolation layer is epoxy resin or cast aluminum, so that in addition to achieving effective magnetic isolation between two adjacent wide teeth 121 or two narrow teeth 122, a reliable and stable connection between the two primary cores 12 in the same single-phase primary unit 10 is achieved (the connection between the two is achieved by curing of injection molding).

[0039] In some embodiments, the wide tooth 121 has a first front-to-back symmetry plane perpendicular to the linear motion direction of the primary iron core 12, and a wide tooth shoe (not labeled in the figure) is formed at the second end of the wide tooth 121. The first front-to-back symmetry plane divides the shoe surface of the wide tooth shoe into a first front side area (not labeled in the figure) and a first rear side area (not labeled in the figure), that is, the first front side area and the first rear side area are front-to-back symmetric about the first front-to-back symmetry plane, and a wide tooth magnetic groove 1210 is formed in one of the first front side area and the first rear side area. The primary permanent magnet includes a wide tooth permanent magnet 131, and the wide tooth permanent magnet 131 is matched and inlaid in the wide tooth magnetic groove 1210, and after the wide tooth permanent magnet 131 is inlaid and assembled in the wide tooth magnetic groove 1210, the outer end surface of the wide tooth permanent magnet 131 is flush with the shoe surface of the wide tooth shoe; and the narrow tooth 122 has a first front-to-back symmetry plane perpendicular to the primary iron core 12 A second front-to-back symmetric plane in the direction of linear motion, a narrow tooth shoe (not marked in the figure) is formed at the second end of the narrow tooth 122, the second front-to-back symmetric plane divides the shoe surface of the narrow tooth shoe into a second front side area (not marked in the figure) and a second rear side area (not marked in the figure), that is, the second front side area and the second rear side area are front-to-back symmetric about the second front-to-back symmetric plane, a narrow tooth magnetic groove 1220 is formed in one of the second front side area and the second rear side area, the primary permanent magnet includes a narrow tooth permanent magnet 132, the narrow tooth permanent magnet 132 is matched and inlaid in the narrow tooth magnetic groove 1220, and after the narrow tooth permanent magnet 132 is inlaid and assembled in the narrow tooth magnetic groove 1220, the outer end surface of the narrow tooth permanent magnet 132 is flush with the shoe surface of the narrow tooth shoe to reduce the fluctuation caused by the tooth groove, and the width of the wide tooth shoe and the narrow tooth shoe in the direction of linear motion of the primary iron core 12 is equal.

[0040] See also Figure 7As shown, the wide-tooth tooth boot has a first front side surface (not labeled in the figure), a first rear side surface (not labeled in the figure), a first left side surface (not labeled in the figure) and a first right side surface (not labeled in the figure), wherein the first left side surface is parallel to and spaced from the first right side surface and perpendicular to the first front-to-back symmetry plane, the wide-tooth tooth boot also has a first left-right symmetry plane perpendicular to the first front-to-back symmetry plane, the first left side surface and the first right side surface are symmetrical about the first left-right symmetry plane, projected on the stator magnetic plate 21, the first front side surface includes a middle plane (not labeled in the figure) parallel to the first front-to-back symmetry plane and a side inclined plane (not labeled in the figure) connected to one end of the middle plane and the first left side surface or the first right side surface, the width of the middle plane in a direction parallel to the first front-to-back symmetry plane is BS2, the spacing between the first left side surface and the first right side surface is BS3, the spacing between the middle plane of the first front side surface and the middle plane of the first rear side surface is BH2, the first left side surface is in the The length of the primary core 12 in the linear motion direction is BH3, BS3: BS2 = 3:1, BH2: BH3 = 3:2; the narrow tooth shoe has a second front side surface (not labeled in the figure), a second rear side surface (not labeled in the figure), an outer side surface (not labeled in the figure) and an inner side surface (not labeled in the figure), wherein the outer side surface is parallel to the inner side surface and is spaced apart and perpendicular to the second front-to-back symmetry plane, and projected on the stator magnetic plate 21, the second front side surface and the second rear side surface both include parallel planes parallel to the second front-to-back symmetry plane ( The outer side surface is connected to the parallel plane at one end away from the wide tooth 121 and the outer side surface. The spacing between the outer side surface and the inner side surface is BS1. The width of the connecting inclined plane in the direction parallel to the second front-to-back symmetry plane is BS2. The spacing between the second front side surface and the second rear side surface is BH2. The length of the outer side surface in the linear motion direction of the primary core 12 is BH1. BS1:BS2=3:2, BH2:BH1=3:2.

[0041] In this technical solution, the wide tooth boots of the wide teeth 121 and the narrow tooth boots of the narrow teeth 122 are objectively designed with a cut angle. Since the wide tooth permanent magnets 131 and the narrow tooth permanent magnets 132 are matched in shape and size and embedded in the corresponding wide tooth magnetic slots 1210 and narrow tooth magnetic slots 1220, the corresponding permanent magnets are objectively designed with a cut angle. The permanent magnets are polygonal, which can be approximately equivalent to oblique pole treatment, which has a more obvious advantage in weakening the positioning force and thrust fluctuations. More importantly, the aforementioned BS2=3:1, BH2:BH3=3:2, BS1:BS2=3:2, BH2:BH1=3:2 size ratios can effectively reduce the 2nd, 3rd, and 4th low-frequency harmonics in the motor positioning force harmonics, thereby further reducing the positioning force and thrust fluctuations.

[0042] In some embodiments, the spacing between the first front-to-back symmetry plane and the second front-to-back symmetry plane is half the width of the wide-tooth shoe in the linear motion direction of the primary core 12, that is, the spacing between the wide teeth 121 and the narrow teeth 122 is BH2 / 2, which can ensure the magnetic isolation distance between adjacent cores and effectively reduce the mutual inductance and self-inductance between adjacent cores.

[0043] See also Figure 8 and Fig. 9 In some embodiments, a plurality of stator magnetic slots 211 are formed on the stator magnetic plate 21, and a spacing boss 212 is provided between two adjacent stator magnetic slots 211 in the linear motion direction of the primary core 12. Each of the secondary permanent magnets is respectively and one by one inlaid and assembled in each of the stator magnetic slots 211. When each of the secondary permanent magnets is inlaid and assembled in the stator magnetic slots 211, the outer end surface of each of the secondary permanent magnets is flush with the top surface of the spacing boss 212 to ensure the uniformity of the breath between the moving stators.

[0044] In some embodiments, the secondary permanent magnet includes a plurality of permanent magnet groups (not labeled in the figure) arranged in a front-to-rear spacing along the linear motion direction of the primary core 12, each permanent magnet group includes a first secondary permanent magnet 221 corresponding to the wide-tooth permanent magnet 131 and two second secondary permanent magnets 222 corresponding to the narrow-tooth permanent magnets 132, each wide-tooth permanent magnet 131 is equal to each first secondary permanent magnet 221 in length, width and thickness, each narrow-tooth permanent magnet 132 is equal to each second secondary permanent magnet 222 in length (i.e., BH2 / 2), width and thickness, each spacing boss 212 is equal to the first secondary permanent magnet 221 and the second secondary permanent magnet 222 in length in the linear motion direction of the primary core 12, and specifically, their magnetization directions should also be the same. In this way, Fig.10As shown, it can ensure that when the second secondary permanent magnet 222 on the stator magnetic plate 21 and the narrow tooth permanent magnet 132 are just offset in the linear motion direction of the primary core 12, the first secondary permanent magnet 221 and the wide tooth permanent magnet 131 are just aligned, ensuring that the main magnetic circuit can enter from the narrow tooth shoe through the V-shaped magnetic yoke 123 and merge into the wide tooth 121, and then enter the stator magnetic plate 21 from the wide tooth shoe of the wide tooth 121 through the air gap, forming a closed loop, that is, realizing the driving movement of the linear motor. Different from the polygon (cut-angle design) of the wide tooth permanent magnet 131 and the narrow tooth permanent magnet 132, the first secondary permanent magnet 221 and the second secondary permanent magnet 222 are specifically rectangular.

[0045] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A bilateral transverse flux linear motor, comprising a single-phase primary unit (10), the single-phase primary unit (10) comprising a primary winding (11), a primary permanent magnet and two primary iron cores (12) arranged alternately with each other, each of the primary iron cores (12) comprising a wide tooth (121), two narrow teeth (122) on the left and right sides of the wide tooth (121) and a yoke (123) connected to a first end of the wide tooth (121) and a first end of each narrow tooth (122), the primary winding (11) being arranged around the wide teeth (121) of the two primary iron cores (12), characterized in that: In the same primary iron core (12), the wide tooth (121) and the two narrow teeth (122) form a front-to-rear spacing in the linear motion direction of the primary iron core (12).

2. The bilateral transverse flux linear motor according to claim 1, characterized in that: It also includes a secondary unit (20), wherein the secondary unit (20) includes two stator magnetic plates (21) arranged opposite to each other and secondary permanent magnets located on opposite sides of each of the stator magnetic plates (21), the single-phase primary unit (10) is located between the two stator magnetic plates (21), and within the same primary core (12), the projections of the yokes (123) on both sides of the wide teeth (121) on any of the stator magnetic plates (21) form a V shape and are mirror images of each other.

3. The bilateral transverse flux linear motor according to claim 2, characterized in that: The matching gap between the two wide teeth (121) and the matching gap between the two narrow teeth (122) respectively possessed by the two primary iron cores (12) are respectively filled with magnetic isolation layers.

4. The bilateral transverse flux linear motor according to claim 3, characterized in that: The material of the magnetic isolation layer is epoxy resin or cast aluminum; and / or the thickness of the magnetic isolation layer is not less than 1.5 to 2 times the air gap distance between the single-phase primary unit (10) and the secondary unit (20).

5. The double-sided transverse flux linear motor according to claim 2, characterized in that: The wide tooth (121) has a first front-to-back symmetric plane perpendicular to the linear motion direction of the primary iron core (12); a wide tooth shoe is formed at the second end of the wide tooth (121); the first front-to-back symmetric plane divides the shoe surface of the wide tooth shoe into a first front side area and a first rear side area; a wide tooth magnetic groove (1210) is formed on one of the first front side area and the first rear side area; the primary permanent magnet comprises a wide tooth permanent magnet (131); the wide tooth permanent magnet (131) is matched and inlaid in the wide tooth magnetic groove (1210); and after the wide tooth permanent magnet (131) is inlaid and assembled in the wide tooth magnetic groove (1210), the outer end surface of the wide tooth permanent magnet (131) is flush with the shoe surface of the wide tooth shoe; and the narrow tooth (122) has a first front-to-back symmetric plane perpendicular to the primary iron core (12); A second front-to-back symmetric plane in the linear motion direction of the iron core (12), a narrow tooth tooth shoe is formed at the second end of the narrow tooth (122), the second front-to-back symmetric plane divides the shoe surface of the narrow tooth tooth shoe into a second front side area and a second rear side area, a narrow tooth magnetic groove (1220) is formed on one of the second front side area and the second rear side area, the primary permanent magnet comprises a narrow tooth permanent magnet (132), the narrow tooth permanent magnet (132) is matched and inlaid in the narrow tooth magnetic groove (1220), and after the narrow tooth permanent magnet (132) is inlaid and assembled in the narrow tooth magnetic groove (1220), the outer end surface of the narrow tooth permanent magnet (132) is flush with the shoe surface of the narrow tooth tooth shoe, and the width of the wide tooth tooth shoe and the narrow tooth tooth shoe in the linear motion direction of the primary iron core (12) is equal.

6. The double-sided transverse flux linear motor according to claim 5, characterized in that: The wide-tooth tooth boot has a first front side, a first rear side, a first left side and a first right side, wherein the first left side is parallel to and spaced from the first right side and perpendicular to the first front-to-back symmetry plane, the wide-tooth tooth boot also has a first left-right symmetry plane perpendicular to the first front-to-back symmetry plane, the first left side and the first right side are symmetrical about the first left-right symmetry plane and are projected onto the stator magnetic plate (21), the first front side includes a middle plane parallel to the first front-to-back symmetry plane and a side inclined plane connected between one end of the middle plane and the first left side or the first right side, the width of the middle plane in a direction parallel to the first front-to-back symmetry plane is BS2, the spacing between the first left side and the first right side is BS3, the spacing between the middle plane of the first front side and the middle plane of the first rear side is BH2, the length of the first left side in the linear motion direction of the primary core (12) is BH3, BS3:BS2=3:1, BH2:BH3=3:

2.

7. The bilateral transverse flux linear motor according to claim 6, characterized in that: The narrow tooth shoe has a second front side surface, a second rear side surface, an outer side surface and an inner side surface, wherein the outer side surface is parallel to and spaced from the inner side surface and perpendicular to the second front-to-back symmetry plane, and is projected onto the stator magnetic plate (21). The second front side surface and the second rear side surface both include a parallel plane parallel to the second front-to-back symmetry plane and a connecting inclined plane connected between the end of the parallel plane away from the wide tooth (121) and the outer side surface. The spacing between the outer side surface and the inner side surface is BS1, the width of the connecting inclined plane in a direction parallel to the second front-to-back symmetry plane is BS2, the spacing between the second front side surface and the second rear side surface is BH2, and the length of the outer side surface in the linear motion direction of the primary core (12) is BH1, BS1:BS2=3:2, BH2:BH1=3:

2.

8. The bilateral transverse flux linear motor according to claim 5, characterized in that: The distance between the first front-to-back symmetric plane and the second front-to-back symmetric plane is half the width of the wide-toothed shoe in the linear motion direction of the primary iron core (12).

9. The bilateral transverse flux linear motor according to claim 5, characterized in that: A plurality of stator magnetic slots (211) are formed on the stator magnetic plate (21), and a spacing boss (212) is provided between two adjacent stator magnetic slots (211) in the linear motion direction of the primary iron core (12). Each of the secondary permanent magnets is respectively embedded and assembled in each of the stator magnetic slots (211) in a one-to-one correspondence. When each of the secondary permanent magnets is embedded and assembled in the stator magnetic slots (211), the outer end surface of each of the secondary permanent magnets is flush with the top surface of the spacing boss (212).

10. The double-sided transverse flux linear motor according to claim 9, characterized in that: The secondary permanent magnet comprises a plurality of permanent magnet groups arranged in a front-to-rear spacing along the linear motion direction of the primary iron core (12), each of the permanent magnet groups comprising a first secondary permanent magnet (221) arranged corresponding to the wide-tooth permanent magnet (131) and two second secondary permanent magnets (222) arranged corresponding to the narrow-tooth permanent magnets (132), the length, width and thickness of each wide-tooth permanent magnet (131) being equal to that of each first secondary permanent magnet (221), the length, width and thickness of each narrow-tooth permanent magnet (132) being equal to that of each second secondary permanent magnet (222), and the length of each spacing boss (212) being equal to that of the first secondary permanent magnet (221) and the second secondary permanent magnet (222) in the linear motion direction of the primary iron core (12).

Images