Permanent magnet linear motor and primary structure thereof

Abstract

The invention discloses a permanent magnet linear motor and a primary structure thereof, and the primary structure comprises a magnetism gathering center body which is made of a magnetic material and is in a preset regular shape; the plurality of silicon steel sheet superposition bodies are arranged on the magnetism gathering center body in a sleeving manner and are sequentially and uniformly distributed in the length direction of the magnetism gathering center body, so that a plurality of wire slots are formed in the magnetism gathering center body; at least one side face of the silicon steel sheet stacked body is a magnetism gathering side face used for being connected with a secondary structure, and each magnetism gathering side face is provided with magnetic steel. And the plurality of coils are respectively arranged in the wire slots and are wound on the magnetism gathering center body. According to the technical scheme, the end length and magnetic flux leakage can be effectively reduced, and the efficiency and the power factor of the linear motor are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a permanent magnet linear motor and its primary structure. Background Art

[0002] In the technical field of motors, as a special type of motor capable of achieving linear motion, the linear motor has received extensive attention and application. However, the existing linear motors still have some deficiencies in many aspects, which limit the performance and application scope of the linear motors.

[0003] For example, the efficiency and power factor of the existing linear motors are relatively low. This is mainly due to the energy losses inside the motor, such as leakage magnetic flux, reluctance loss, copper loss, etc. These losses not only reduce the efficiency of the motor, but also increase the energy consumption and operating cost. Therefore, improving the efficiency and power factor of the linear motor has become an urgent problem to be solved. Summary of the Invention

[0004] The present invention provides a permanent magnet linear motor and its primary structure, and the purpose is to improve the efficiency and power factor of the linear motor.

[0005] Specifically, in the first aspect, the present invention provides a primary structure of a permanent magnet linear motor, including:

[0006] A magnetic flux concentrating core body, which is made of magnetic material and has a preset regular shape;

[0007] A plurality of silicon steel sheet stacks, which are all sleeved on the magnetic flux concentrating core body and are uniformly distributed in sequence in the length direction of the magnetic flux concentrating core body to form a plurality of wire grooves on the magnetic flux concentrating core body; at least one side surface of the silicon steel sheet stack is a magnetic flux concentrating side surface for connecting the secondary structure, and a magnetic steel is arranged on each magnetic flux concentrating side surface;

[0008] A plurality of coils, which are respectively arranged in the wire grooves and wound around the magnetic flux concentrating core body.

[0009] Furthermore, each magnetic flux concentrating side surface is provided with a U-shaped mounting groove, and each magnetic steel is respectively assembled in the U-shaped mounting groove of its corresponding magnetic flux concentrating side surface.

[0010] Furthermore, the magnetic flux concentrating core body is made of SMC soft magnetic material, and carbon steel is attached to the outer surface of the magnetic flux concentrating core body.

[0011] Furthermore, each silicon steel sheet stack is provided with a magnetic shoe for reducing the distance between adjacent silicon steel sheet stacks.

[0012] Further, the silicon steel sheet stack is a splicing body formed by stacking a plurality of non-oriented silicon steel sheets or oriented silicon steel sheets in the length direction of the magnetic focusing center body.

[0013] Further, the primary structure is formed by curing with epoxy resin after assembling each of the silicon steel sheet stacks onto the magnetic focusing center body and arranging each of the coils in its corresponding wire groove.

[0014] Further, the magnetic focusing center body is cylindrical, and a positioning device is provided on each of the silicon steel sheet stacks for maintaining the consistency of the direction of each of the silicon steel sheet stacks.

[0015] In a second aspect, the present invention further provides a permanent magnet linear motor, comprising:

[0016] a secondary structure, and the primary structure according to any one of the above.

[0017] Further, the secondary structure includes a plurality of secondary plates, and the plurality of secondary plates are sequentially connected to form a long groove with a preset shape; the primary structure is assembled in the long groove and can move in the length direction of the long groove.

[0018] Further, the plurality of secondary plates are integrally formed to form the secondary structure.

[0019] In the technical solution of the present invention, the primary structure of the permanent magnet linear motor uses a plurality of silicon steel sheet stacks to form a plurality of wire grooves on the magnetic focusing center body, and a permanent magnet is assembled on the silicon steel sheet stack, and the coils are assembled in each wire groove. Since the magnetic focusing center body, the silicon steel sheet stack and the permanent magnet can improve the magnetic focusing effect of the primary structure, the magnetic leakage phenomenon of the ordinary vernier motor can be reduced, thereby reducing the end effect of the permanent magnet linear motor, and at the same time reducing the proportion of the end impedance in the system, further improving the thrust density of the permanent magnet linear motor. And the primary structure of the present invention has the advantage of strong magnetic focusing effect, so it also helps to reduce the volume and weight of the permanent magnet linear motor, making it more compact and lightweight. Since the secondary structure does not contain permanent magnets, it has low cost and is easy to process, and is particularly suitable for the field of long-distance linear motion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the primary structure of a permanent magnet linear motor in an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of the primary structure of a permanent magnet linear motor in another embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of the primary structure of a permanent magnet linear motor in yet another embodiment of the present invention;

[0023] Figure 4 Schematic structural diagram of the primary structure of a permanent magnet linear motor in another embodiment of the present invention;

[0024] Figure 5 Schematic structural diagram of a permanent magnet linear motor in an embodiment of the present invention;

[0025] Figure 6 Exploded view of a permanent magnet linear motor in an embodiment of the present invention. Detailed implementation manners

[0026] Terms such as "first", "second", etc. in the specification, claims and the above-mentioned accompanying drawing descriptions of this application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing when describing objects with the same attributes in the embodiments of this application. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product or device including a series of units does not have to be limited to those units, but may include other units not clearly listed or inherent to these processes, methods, products or devices.

[0027] Please refer to Figures 1 - 6 , in which Figure 1 shown is a schematic diagram of the primary structure of a permanent magnet linear motor in an embodiment of the present invention. The primary structure includes a magnetic flux concentrating center body 11, a plurality of coils 12 and a plurality of stacks of silicon steel sheets 13. The magnetic flux concentrating center body 11 is made of a magnetic material and has a preset regular shape. For example, it can be in the shape of a cuboid or a cylinder. The magnetic flux concentrating center body 11 can play a role of concentrating magnetic flux during the operation of the permanent magnet linear motor, enhancing the electromagnetic induction intensity between the secondary structure and the primary structure.

[0028] Each stack of silicon steel sheets 13 is sleeved on the magnetic flux concentrating center body 11, and the stacks of silicon steel sheets 13 are evenly spaced along the length direction of the magnetic flux concentrating center body 11, so as to form a plurality of wire grooves 14 on the magnetic flux concentrating center body 11. The wire grooves 14 are the positions between adjacent stacks of silicon steel sheets 13 on the magnetic flux concentrating center body 11. Each coil 12 is disposed in the corresponding wire groove 14 and wound around the magnetic flux concentrating center body 11 at the corresponding wire groove.

[0029] In this embodiment, the stack of silicon steel sheets 13 is in the shape of a polyhedron, and at least one side surface is a magnetic flux concentrating side surface for approaching the secondary structure, and a magnetic steel is disposed on the magnetic flux concentrating side surface to increase the electromagnetic induction intensity between the secondary structure and the primary structure, and can further improve the magnetic flux concentrating effect of the secondary structure.

[0030] For example, in this embodiment, the bottom surface, left side surface, and right side surface of each silicon steel sheet stack 13 are side surfaces close to the secondary structure, that is, magnetic flux concentrating side surfaces. Then, a first permanent magnet 141, a second permanent magnet 142, and a third permanent magnet 143 are respectively arranged on the bottom surface, left side surface, and right side surface of each silicon steel sheet stack 13. Among them, the first permanent magnet 141 can enhance the magnetic flux concentrating ability at the bottom of the primary structure, the second permanent magnet 14 can enhance the magnetic flux concentrating ability at the left part of the primary structure, and the third permanent magnet 143 can enhance the magnetic flux concentrating ability at the right part of the primary structure.

[0031] According to the above content, in the secondary structure of the permanent magnet linear motor of this embodiment, multiple silicon steel sheet stacks form multiple wire grooves on the magnetic flux concentrating central body, and permanent magnets are assembled on the silicon steel sheet stacks, and coils are assembled in each wire groove. Since the magnetic flux concentrating central body, silicon steel sheet stacks, and permanent magnets can improve the magnetic flux concentrating effect of the secondary structure, the magnetic leakage phenomenon of the ordinary vernier motor can be reduced, thereby reducing the end effect of the permanent magnet linear motor. At the same time, the proportion of the end impedance in the system is reduced, and the thrust density of the permanent magnet linear motor is further improved. And the primary structure of this embodiment has the advantage of strong magnetic flux concentrating effect, so it also helps to reduce the volume and weight of the permanent magnet linear motor, making it more compact and lightweight.

[0032] In some embodiments of the present invention, U-shaped mounting grooves are arranged on the magnetic flux concentrating side surfaces of the silicon steel sheet stacks 13, and each permanent magnet is respectively assembled in the U-shaped mounting groove on its corresponding magnetic flux concentrating side surface.

[0033] For example, a first U-shaped mounting groove 131 is arranged on the bottom surface of each silicon steel sheet stack 13, a second U-shaped mounting groove 132 is arranged on the left side surface, and a third U-shaped mounting groove 133 is arranged on the right side surface. And the first permanent magnet 141 is assembled in the first U-shaped mounting groove 131, the second permanent magnet 142 is assembled in the second U-shaped mounting groove 132, and the third permanent magnet 143 is assembled in the third U-shaped mounting groove 133.

[0034] In this embodiment, U-shaped mounting grooves are arranged on the magnetic flux concentrating side surfaces of the silicon steel sheet stacks 13 to assemble permanent magnets, which can improve the stability and convenience of permanent magnet assembly.

[0035] In other embodiments, each permanent magnet of the silicon steel sheet stack 13 can be assembled on its corresponding magnetic flux concentrating side surface by other means. For example, each permanent magnet can be attached to its corresponding magnetic flux concentrating side surface by means of pasting.

[0036] In some embodiments of the present invention, the magnetic flux concentrating central body 11 is made of SMC soft magnetic material, and carbon steel is attached to the outer surface of the magnetic flux concentrating central body 11, and the thickness of the carbon steel can be set between 0.2 mm and 0.6 mm.

[0037] SMC soft magnetic material is a new type of iron-based powder magnetic material, which has a wide range of applications in the field of power electronic components. The characteristics of SMC soft magnetic material are low high-frequency eddy current loss and high saturation magnetic induction intensity. The magnetic properties of SMC soft magnetic material are relatively stable and are not easily affected by temperature and time. These characteristics are beneficial to the long-term operation stability of DC motors.

[0038] Although the SMC soft magnetic material has low strength and low efficiency at low frequencies, at high-frequency operation, due to the low eddy current loss of the SMC soft magnetic material, it may exhibit better performance than traditional materials. Therefore, in this embodiment, carbon steel is attached to the surface of the SMC soft magnetic material in the magnetic concentrating center body 11 to increase the overall strength of the SMC soft magnetic material.

[0039] In some embodiments of the present invention, each grain-oriented silicon steel 13 is provided with a plurality of magnetic shoes 151, and the respective magnetic shoes 151 are respectively arranged at the top and bottom of the front and rear sides of the corresponding grain-oriented silicon steel 13, wherein the front-rear direction is the length direction of the magnetic concentrating center body 11.

[0040] During the operation of the linear motor, the space formed by the wire grooves 14 may generate thrust fluctuations due to magnetic field non-uniformity or other factors. Such fluctuations will not only affect the running smoothness of the motor, but may also cause an increase in the noise and a shortening of the lifespan of the DC motor. Therefore, in this embodiment, the tooth shoes 151 are arranged on the silicon steel 13, which can not only effectively ensure the winding space of the coil 12, but also shorten the distance between adjacent silicon steels 13 to improve the uniformity of the magnetic field distribution of the secondary structure and reduce the thrust fluctuations of the permanent magnet DC motor.

[0041] In some embodiments of the present invention, the silicon steel sheet stack 13 is a splicing body formed by stacking a plurality of non-oriented silicon steel sheets or grain-oriented silicon steel sheets in the length direction of the magnetic concentrating center body.

[0042] In this embodiment, if the silicon steel sheet stack 13 uses non-oriented silicon steel sheets, the non-oriented silicon steel sheets are stacked in the length direction of the magnetic concentrating center body 11 to splice into the silicon steel sheet stack 13. If the silicon steel sheet stack 13 uses grain-oriented silicon steel sheets, first, a plurality of grain-oriented silicon steel sheets are spliced into a silicon steel sheet, and the magnetic orientation of each grain-oriented silicon steel sheet is the central direction of the silicon steel sheet, and then a plurality of silicon steel sheets are stacked in the length direction of the magnetic concentrating center body 11 to obtain the silicon steel sheet stack.

[0043] In some embodiments of the present invention, the primary structure 10 is formed by assembling a plurality of silicon steel sheet stacks 13 onto the magnetic concentrating center body 11, and respectively arranging each coil 12 in its corresponding wire groove 14, and then curing and forming with epoxy resin.

[0044] In this embodiment, epoxy resin is used to cure and form the primary structure, which can prevent the primary structure from deforming and ensure the stability and safety of the primary structure.

[0045] In some embodiments of the present invention, the poly-magnetic center body 11 is cylindrical, and a positioning device is provided on each silicon steel sheet stack 13. The positioning device is used to maintain the consistency of the direction of each silicon steel sheet stack 13.

[0046] In this embodiment, the positioning device on the silicon steel sheet stack 13 includes a first positioning hole 131 and a second positioning hole 132. After assembling each silicon steel sheet stack 13 onto the poly-magnetic center body 11, the first positioning holes 131 of each silicon steel sheet stack 13 are connected, and the second positioning holes 132 of each silicon steel sheet stack 13 are connected.

[0047] In this embodiment, the positioning device is used to position each silicon steel sheet stack 13, which can make the direction of each silicon steel sheet stack 13 consistent and improve the stability of the primary structure 10.

[0048] In some embodiments of the present invention, the linear motor of the present invention includes a primary structure 10 and a secondary structure 20. The secondary structure 10 can be the primary structure in any of the above embodiments. Since the primary structure 10 has been described in detail in the above embodiments, in order to avoid redundancy, it will not be described in detail in this embodiment.

[0049] In some embodiments of the present invention, the secondary structure 20 includes a plurality of secondary plates. The plurality of secondary plates are sequentially connected to form a long groove with a preset shape. The primary structure 10 is assembled in the long groove and can move in the length direction of the long groove.

[0050] For example, the secondary structure 20 includes a first secondary plate 211, a second secondary plate 212, and a third secondary plate 213. The first secondary plate 211, the second secondary plate 212, and the third secondary plate 213 are sequentially connected to form a U-shaped long groove 210, and the length direction of the U-shaped long groove 210 is the same as the length direction of the first secondary plate 211, the second secondary plate 212, and the third secondary plate 213. The primary structure 10 is assembled in the U-shaped long groove 210, matches the shape of the U-shaped long groove 210, and the length direction is the length direction of the U-shaped long groove 210.

[0051] In some embodiments of the present invention, the plurality of secondary plates of the secondary structure 20 are integrally formed.

[0052] In this embodiment, the plurality of secondary plates of the secondary structure 20 are manufactured by an integral forming technology, that is, they are no longer manufactured and assembled separately, but directly form a whole during the manufacturing process.

[0053] In this embodiment, a plurality of secondary plates of the secondary structure 20 are integrally formed, which can not only reduce the assembly error between components, improve the overall accuracy and reliability of the DC motor, but also reduce the assembly steps and lower the production cost of the DC motor.

[0054] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The primary structure of a permanent magnet linear motor, characterized in that, Comprising: A magnetic flux concentrating core body, which is made of a magnetic material and has a preset regular shape; A plurality of stacked silicon steel sheets, which are all sleeved on the magnetic flux concentrating core body and are uniformly distributed in sequence in the length direction of the magnetic flux concentrating core body to form a plurality of wire grooves on the magnetic flux concentrating core body; at least one side surface of the stacked silicon steel sheets is a magnetic flux concentrating side surface for connecting a secondary structure, and a magnetic steel is arranged on each magnetic flux concentrating side surface; A plurality of coils, which are respectively arranged in the wire grooves and wound around the magnetic flux concentrating core body.

2. The primary structure according to claim 1, wherein: Each magnetic flux concentrating side surface is provided with a U-shaped mounting groove, and each magnetic steel is respectively assembled in the U-shaped mounting groove of its corresponding magnetic flux concentrating side surface.

3. The primary structure according to claim 1, wherein: The magnetic flux concentrating core body is made of SMC soft magnetic material, and carbon steel is attached to the outer surface of the magnetic flux concentrating core body.

4. The primary structure according to claim 1, wherein: Each stacked silicon steel sheet is provided with a magnetic yoke for reducing the distance between adjacent stacked silicon steel sheets.

5. The primary structure according to claim 1, wherein: The stacked silicon steel sheets are a splicing body formed by stacking a plurality of non-oriented silicon steel sheets or oriented silicon steel sheets in the length direction of the magnetic flux concentrating core body.

6. The primary structure according to claim 1, wherein: The primary structure is formed by curing with epoxy resin after assembling each stacked silicon steel sheet to the magnetic flux concentrating core body and arranging each coil in its corresponding wire groove.

7. The secondary structure according to claim 1, wherein: The magnetic flux concentrating core body is cylindrical, and a positioning device is arranged on each stacked silicon steel sheet for maintaining the consistency of the direction of each stacked silicon steel sheet.

8. A permanent magnet linear motor, characterized in that, Comprising: A secondary structure, and the primary structure according to any one of claims 1-9.

9. The permanent magnet linear motor according to claim 8, wherein: The secondary structure includes a plurality of secondary plates, and the plurality of secondary plates are sequentially connected to form a long groove with a preset shape; the primary structure is assembled in the long groove and can move in the length direction of the long groove.

10. The permanent magnet linear motor according to claim 9, wherein: The plurality of secondary plates are integrally formed to form the secondary structure.

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