Direct Drive System

Abstract

The present invention provides a direct drive system including a stator, a primary assembly, a mover, a secondary assembly, and a first magnetic yoke. [Solution] The first magnetic yoke is provided on one side of the stator, the primary assembly is provided on the first magnetic yoke, the mover has a first support surface and a second support surface, the first support surface and the second support surface are provided separately on opposite sides of the stator, the secondary assembly is provided on the first support surface and faces the primary assembly, a first gap is formed between the secondary assembly and the primary assembly, a magnetic field loop is formed between the secondary assembly, the primary assembly and the first magnetic yoke, the side of the stator away from the first magnetic yoke faces the second support surface, and the second support surface is used to support a table surface.

Description

[Technical Field]

[0001] The present invention relates to the technical field of motor drives, and more particularly to direct drive systems. [Background technology]

[0002] Direct drive refers to a new type of motor that is directly connected to the motion executing part, that is, the motor directly drives the machine operation without any intermediate mechanical transmission part. Direct drive applications include linear motion components that use linear motors as the core driving element, and rotary motion components that use torque motors as the core driving element.

[0003] Current direct drive systems have the following advantages: (1) In terms of equipment lifespan, the direct drive system reduces mechanical transmission parts, reduces wear, improves equipment lifespan, and also saves energy. (2) The direct drive system cancels mechanical transmission, thereby reducing the failure rate, saving parts and manufacturing costs, and further reducing the overall cost of the equipment. (3) The direct drive system greatly improves the processing efficiency of the equipment and effectively improves the processing accuracy.

[0004] However, current direct drive systems also have the following drawbacks: To form a magnetic field loop between the primary assembly fixed to the stator and the secondary assembly fixed to the mover, the current-carrying coil of the primary assembly interacts with the magnetic field loop to drive the mover to move along a predetermined trajectory, so a magnetic body must be installed between the base supported by the mover and the stator to generate a magnetic field. However, when the mover is subjected to pressure from the base and moves relative to the stator, the magnetic body is easily damaged, which reduces the reliability of the direct drive system. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art and to provide a new technical solution for a direct drive system. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a direct drive system, the direct drive system including a stator, a primary assembly, a mover, a secondary assembly, and a first magnetic yoke, the first magnetic yoke being provided on one side of the stator, the primary assembly being provided on the first magnetic yoke, the mover having a first support surface and a second support surface, the first support surface and the second support surface being provided separately on opposite sides of the stator, the secondary assembly being provided on the first support surface and facing the primary assembly, a first gap being formed between the secondary assembly and the primary assembly, and a magnetic field loop being formed between the secondary assembly, the primary assembly, and the first magnetic yoke, The side of the stator that is away from the first magnetic yoke faces the second support surface, and the second support surface is used to support a table surface.

[0007] Preferably, the primary assembly includes a plurality of primary units, the plurality of primary units being distributed in the first magnetic yoke along the extension direction of the first magnetic yoke; Each of the primary units includes a coil and an iron core, the iron core is fixed to the first magnetic yoke, and the coil is fitted around the iron core.

[0008] Preferably, the secondary assembly includes a second magnetic yoke and a magnetic body, an even number of the magnetic bodies are provided on the second magnetic yoke, and two adjacent magnetic bodies have opposite polarities; The magnetic flux passes through the first magnetic body, the first iron core, the first magnetic yoke, the second iron core, the second magnetic body, and the second magnetic steel in this order, and then flows into the first magnetic body, forming a magnetic field loop. The first magnetic body and the second magnetic body are adjacent to each other, and the first iron core and the second iron core are adjacent to each other.

[0009] Preferably, the first magnetic yoke includes a predetermined segment extending along a circular arc.

[0010] Preferably, the plurality of primary units are distributed at intervals in the predetermined segment, and any two adjacent primary units form a predetermined included angle.

[0011] Preferably, the direct drive system further includes a base and a support base, the stator being fixed to the support base, and the support base being fixed to the base.

[0012] Preferably, the direct drive system further includes a position regulation assembly, the position regulation assembly including a slider and a guide rail; The guide rail is fixed to the base, the guide rail extends along a direction in which the plurality of primary units are distributed, and the slider is fixed to the movable element, the slider is attached to the guide rail, and can move along the direction in which the guide rail extends.

[0013] Preferably, a groove is provided in the movable element, a part of the stator is fitted into the groove, and an inner wall of the groove forms a first support surface; The second support surface is formed by an outer wall of the groove, and the first support surface and the second support surface face in the same direction.

[0014] Preferably, a second gap is formed between the stator and an inner wall of the groove facing the first support surface.

[0015] Preferably, the slider includes a first slide groove and a second slide groove facing each other, and the guide rail includes a first protrusion and a second protrusion extending in opposite directions, The first protrusion is fitted into the first slide groove, and the second protrusion is fitted into the second slide groove. [Effects of the Invention]

[0016] One technical effect of the present invention is as follows. In the direct drive system of the present invention, the mover has a first support surface and a second support surface, the first support surface and the second support surface are provided separately on opposite sides of the stator, the secondary assembly is provided on the first support surface, and the second support surface is used to support the table surface, whereby the secondary assembly and the table surface are provided separately on opposite sides of the stator, a first magnetic yoke is provided on one side of the stator, a primary assembly is provided on the first magnetic yoke, and the secondary assembly faces the primary assembly, and the side of the stator away from the first magnetic yoke faces the second support surface, and a magnetic field loop is formed between the secondary assembly, the primary assembly, and the first magnetic yoke. As can be seen from the above, a magnetic field loop is formed on one side of the stator, and the table top is fixed on the other side. In this way, there is no need to provide a component such as a magnetic material between the stator and the table top to form the magnetic field loop. On the one hand, the structural design of the direct drive system is rational, the method of forming the magnetic field loop is simple, and the assembly of each component is facilitated. On the other hand, damage to components such as the magnetic material due to the pressure of the table top during the process of the mover moving relative to the stator is avoided, thereby ensuring the stability and reliability of the direct drive system. Third, a first gap is formed between the secondary assembly and the primary assembly, which contributes to ensuring the smooth and stable movement of the mover when driven relative to the stator, and also contributes to avoiding damage to the secondary assembly and primary assemblies during the movement process, thereby further ensuring the stability and reliability of the direct drive system. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a structural schematic diagram of a direct drive system according to an embodiment of the present invention; [Figure 2] FIG. 2 is a structural schematic diagram of a direct drive system according to an embodiment of the present invention, showing another view angle; [Figure 3] FIG. 2 is a schematic diagram illustrating the positional relationship between a primary assembly and a secondary assembly of a direct drive system according to an embodiment of the present invention. [Figure 4] FIG. 2 is a schematic diagram of a magnetic field loop of a direct drive system according to an embodiment of the present invention. [Figure 5] 3A and 3B are structural schematic diagrams of a first slide groove and a second slide groove of a slider in a direct drive system according to an embodiment of the present invention. [Figure 6] FIG. 1 is a bottom view of the primary assembly of the direct drive system of an embodiment of the present invention. [Figure 7] FIG. 2 is a bottom view of the direct drive system according to the embodiment of the present invention. [Figure 8] FIG. 8 is a cross-sectional view taken along line AA in FIG. [Figure 9] 3 is a schematic diagram of the connection relationship between the first magnetic steel and the primary unit of the direct drive system according to the embodiment of the present invention. FIG. [Figure 10] FIG. 2 is a structural schematic diagram of a mover and a secondary assembly of a direct drive system according to an embodiment of the present invention. [Figure 11] 3 is a schematic diagram of a groove of a mover of a direct drive system according to an embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Various exemplary embodiments of the present application will be described in detail below with reference to the drawings. Unless otherwise specified, the relative arrangement of components and steps, numerical expressions and values ​​described in these embodiments do not limit the scope of the present application.

[0019] The following describes in detail the embodiments of the present application, and examples of the embodiments are illustrated in the drawings, where the same or similar reference numerals throughout refer to the same or similar elements or elements having the same or similar functions. It should be understood that the embodiments described below with reference to the drawings are illustrative and are for the purpose of explaining the present application only, and do not limit the present application. Any other embodiments that a person skilled in the art can come up with based on the embodiments in the present application without requiring any creative effort shall fall within the scope of protection of the present application.

[0020] In the present specification and claims, the terms "first" and "second" feature may explicitly or implicitly include one or more of those features. In the present description, unless otherwise specified, "plurality" means two or more than two. Also, in the specification and claims, "and / or" refers to at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the related objects.

[0021] In the description of this application, the orientations or positional relationships indicated by terms such as "center," "longitudinal direction," "lateral direction," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown based on the drawings, and are intended merely for the convenience of explaining and simplifying the description of this application. It should be understood that these terms do not indicate or imply that the indicated devices or elements must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be understood as limiting the application.

[0022] In the description of this application, unless otherwise specified or limited, the terms "attached," "connected," and "coupled" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in this application depending on the specific circumstances.

[0023] 1 to 11, the present application provides a direct drive system for moving a work table along a predetermined trajectory, for example, a linear trajectory. Of course, the trajectory of the work table can be set according to actual needs, and the trajectory may be, but is not limited to, a linear trajectory.

[0024] 1 and 2, the direct drive system includes a stator 1, a primary assembly, a mover 3, a secondary assembly 4, and a first magnetic yoke 5. Here, the stator 1 is a fixed structure, and the mover 3 is a movable structure, and the mover 3 moves relative to the stator 1 when driven by the direct drive system.

[0025] More specifically, a first magnetic yoke 5 is provided on one side of the stator 1, a primary assembly is provided on the first magnetic yoke 5, the mover 3 has a first support surface 31 and a second support surface 32, the first support surface 31 and the second support surface 32 are provided separately on opposite sides of the stator 1, a secondary assembly 4 is provided on the first support surface 31 and faces the primary assembly, a first gap 81 is formed between the secondary assembly 4 and the primary assembly, and a magnetic field loop 100 is formed between the secondary assembly 4, the primary assembly, and the first magnetic yoke 5. Here, with regard to the magnetic field loop 100, refer to Figures 3 and 4.

[0026] The side of the stator 1 away from the first magnetic yoke 5 faces the second support surface 32, which is used to support the table surface, thereby enabling the table surface to move according to a predetermined trajectory by the mover 3.

[0027] In the direct drive system of the present invention, the mover 3 has a first support surface 31 and a second support surface 32, which are provided separately on opposite sides of the stator 1, the secondary assembly 4 is provided on the first support surface 31, and the second support surface 32 is used to support the table surface, whereby the secondary assembly 4 and the table surface are provided separately on opposite sides of the stator 1. Furthermore, a first magnetic yoke 5 is provided based on one side of the stator 1, and a primary assembly is provided on the first magnetic yoke 5, with the secondary assembly 4 facing the primary assembly and the side of the stator 1 away from the first magnetic yoke 5 facing the second support surface 32, and a magnetic field loop 100 is formed between the secondary assembly 4, the primary assembly, and the first magnetic yoke 5.

[0028] As can be seen from the above, a magnetic field loop 100 is formed on one side of the stator 1, and the table surface is fixed on the other side. This eliminates the need for components such as the magnetic material 42 to form the magnetic field loop 100 between the stator 1 and the table surface. On the one hand, the structural design of the direct drive system is rational, the method for forming the magnetic field loop 100 is simple, and the assembly of each component is facilitated. On the other hand, damage to components such as the magnetic material 42 due to pressure from the table surface during the movement of the mover 3 relative to the stator 1 is avoided, ensuring the stability and reliability of the direct drive system. Third, a first gap 81 is formed between the secondary assembly 4 and the primary assembly, which contributes to ensuring the smooth and stable movement of the mover 3 relative to the stator 1 and also contributes to preventing damage to the secondary assembly 4 and the primary assembly during the movement process, thereby further ensuring the stability and reliability of the direct drive system.

[0029] Preferably, referring to FIGS. 6 and 9, the primary assembly includes a plurality of primary units 21, which are distributed on the first magnetic yoke 5 along the extending direction of the first magnetic yoke 5.

[0030] Each primary unit 21 includes a coil 211 and an iron core 212 , the iron core 212 is fixed to the first magnetic yoke 5 , and the coil 211 is fitted around the iron core 212 .

[0031] In addition, adjacent primary units 21 are distributed with a gap between them. The first magnetic yoke 5 can extend in the moving direction of the mover 3, so that the multiple primary units 21 distributed along the extending direction of the first magnetic yoke 5 can cooperate well with the secondary units on the mover 3 to form a magnetic field loop 100, and the interaction between the magnetic field loop 100 and the primary assembly can ensure that the mover 3 moves more smoothly.

[0032] In the above embodiment, the structure of the primary unit 21 and the distribution method of multiple primary units 21 are simplified, which also contributes to optimizing the structure of the direct drive system and improving the stability of the connection between the primary assembly and the first magnetic yoke 5.

[0033] 10 and 11, the secondary assembly 4 preferably includes a second magnetic yoke 41 and magnetic bodies 42, an even number of magnetic bodies 42 are provided on the second magnetic yoke 41, and adjacent two magnetic bodies 42 have opposite polarities. For example, the magnetic bodies 42 may be magnetic steel. The even number of magnetic bodies 42 ensures that a magnetic field loop 100 can be formed between the primary assembly, the secondary assembly 4, and the first magnetic yoke 5 during the movement of the mover 3.

[0034] The magnetic flux passes through the first magnetic body 42, the first iron core 212, the first magnetic yoke 5, the second iron core 212, the second magnetic body 42, and the second magnetic steel in this order, before flowing into the first magnetic body 42, thereby forming a magnetic field loop 100. Here, the first magnetic body 42 and the second magnetic body 42 are adjacent to each other, and the first iron core 212 and the second iron core 212 are adjacent to each other.

[0035] In the above embodiment, the magnetic field loop 100 is located on the side of the stator 1 that is away from the table surface, and the formation method of the magnetic field loop 100 is reasonable, which not only reduces the amount of magnetic material 42 used and contributes to cost savings, but also contributes to simplifying the structure of the secondary assembly 4, and at the same time, can effectively realize the stator 1 moving better through the cooperation of the coil 211 and the magnetic field loop 100.

[0036] Preferably, the first magnetic yoke 5 includes a predetermined segment extending along a circular arc. When the first magnetic yoke 5 has a predetermined segment extending along a circular arc, the multiple primary units 21 are distributed along the predetermined arc-shaped segment, so that the secondary units on the mover 3 cooperate with the primary units 21 to make the mover 3 move along a circular arc-shaped trajectory, which can effectively make the mover 3 move the worktable along a circular arc-shaped trajectory, and the movement method is simple.

[0037] Preferably, the primary units 21 are distributed at intervals in a predetermined segment, and any two adjacent primary units 21 form a predetermined included angle.

[0038] The above embodiment contributes to realizing the formation of a stable magnetic field loop 100 between the secondary unit, the primary unit 21 and the first magnetic steel, and can ensure that the mover 3 moves the work table more stably along the arc-shaped trajectory.

[0039] Preferably, the direct drive system further includes a base 9 and a support 6 , the stator 1 being fixed to the support 6 , and the support 6 being fixed to the base 9 .

[0040] In the above embodiment, the support 6 can securely fix the stator 1, and the base 9 can contribute to stably fixing the stator 1 in a predetermined position.

[0041] Preferably, the direct drive system further includes a slider 71 and a guide rail 72 . The guide rail 72 is fixed to the base 9, and the guide rail 72 extends along the direction in which the multiple primary units 21 are distributed, and the slider 71 is fixed to the movable element 3, and the slider 71 is attached to the guide rail 72 and can move along the direction in which the guide rail 72 extends.

[0042] In the above embodiment, the guide rail 72 extends along the direction in which the multiple primary units 21 are distributed, which helps ensure that the mover 3 can cooperate well with the primary assembly during its movement, makes it easier to realize the magnetic field loop 100, and makes the mover 3 move more stably.

[0043] In addition, the guide rail 72 fits into the slider 71, contributing to accurately guiding the direction of movement of the mover 3 and at the same time contributing to reducing movement resistance, thereby allowing the mover 3 to move the work table accurately and stably along a predetermined trajectory.

[0044] Preferably, referring to FIGS. 1 and 11, a groove 33 is provided in the mover 3, a part of the stator 1 is fitted into the groove 33, and an inner wall of the groove 33 forms the first support surface 31; The outer wall of the recessed groove 33 forms a second support surface 32, and the first support surface 31 and the second support surface 32 face in the same direction.

[0045] In the above embodiment, the structural design of the mover 3 is reasonable, and the need for a magnetic material 42 such as magnetic steel between the table surface and the stator 1 can be effectively avoided, significantly reducing the amount of magnetic steel used, while optimizing the structure of the secondary assembly 4 and effectively reducing costs.

[0046] Preferably, a second gap 82 is formed between the inner wall of the groove 33 facing the first support surface 31 and the stator 1. This leaves only a motion gap between the table surface and the stator 1, and no magnetic steel between the table surface and the stator 1, improving reliability. At the same time, this can contribute to more stable movement of the mover 3 relative to the stator 1.

[0047] 5 and 6, the slider 71 preferably includes a first slide groove 711 and a second slide groove 712 facing each other. Referring to FIGS. 7 and 8, the guide rail 72 preferably includes a first protrusion 721 and a second protrusion 722 extending in opposite directions. The first protrusion 721 is fitted into the first slide groove 711 , and the second protrusion 722 is fitted into the second slide groove 712 .

[0048] In the above embodiment, the first protrusion 721 is fitted into the first slide groove 711, and the second protrusion 722 is fitted into the second slide groove 712, which not only achieves accurate positional control of the movable member 3, but also contributes to ensuring stability during the movement of the movable member 3.

[0049] In addition, in the current direct drive system, magnetic steel is provided between the stator 1 and the table surface, which on the one hand increases the amount of magnetic steel used and increases costs, and on the other hand, the magnetic steel is easily damaged in the process of movement of the mover 3, reducing the stability of the direct drive system.

[0050] The technical solution of the present invention can effectively solve the problems existing in the prior art by forming a magnetic field loop 100 between the secondary assembly 4, the primary assembly, and the first magnetic yoke 5, provided that no magnetic material 42 such as magnetic steel is provided between the table surface and the stator 1. That is, magnetic flux flows from the secondary assembly 4 to the primary assembly and then returns to the secondary assembly 4, thereby forming a circuit. Therefore, the direct drive system provided by the embodiment of the present application enables the mover 3 to move along a predetermined trajectory, which not only significantly reduces the cost of the direct drive system, but also optimizes the structure of the direct drive system and ensures the stability and reliability of the entire direct drive system.

[0051] In some embodiments, the primary unit 21 is stably fixed to the first magnetic yoke 5 by an assembly tool. The assembly method is simple, which can contribute to quickly achieving the fixation between the primary assembly and the first magnetic yoke 5.

[0052] In another embodiment, referring to Figure 1, positioning protrusions 10 are provided at intervals on the surface of the first magnetic yoke 5 facing the primary unit 21, and at least one primary unit 21 is provided between two adjacent positioning protrusions 10, thereby enabling positioning relative to the primary unit 21 and contributing to quick and accurate attachment of the primary unit 21 to the first magnetic yoke 5.

[0053] To sum up, the structural design of the direct drive system provided by the present invention is reasonable, can provide good protection for the primary assembly and secondary assembly 4, and is stable and reliable.

[0054] It is understood that the above embodiments are merely exemplary embodiments used to explain the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art can make various modifications and improvements without departing from the spirit and substance of the present invention, and these modifications and improvements are also considered to be within the protection scope of the present invention. [Explanation of symbols]

[0055] 100, magnetic field loop; 1, stator; 21, primary unit; 211, coil; 212, iron core; 3, mover; 31, first support surface; 32, second support surface; 33, groove; 4, secondary assembly; 41, second magnetic yoke; 42, magnetic material; 5, first magnetic yoke; 6, support base; 71, slider; 711, first slide groove; 712, second slide groove; 72, guide rail; 721, first protrusion; 722, second protrusion; 81, first gap; 82, second gap; 9, base; 10, positioning protrusion.

Claims

1. A direct drive system, the rotor includes a stator, a primary assembly, a mover, a secondary assembly, and a first magnetic yoke, the first magnetic yoke being provided on one side of the stator, the primary assembly being provided on the first magnetic yoke, the mover having a first support surface and a second support surface, the first support surface and the second support surface being provided separately on opposite sides of the stator, the secondary assembly being provided on the first support surface and facing the primary assembly, a first gap being formed between the secondary assembly and the primary assembly, and a magnetic field loop being formed between the secondary assembly, the primary assembly, and the first magnetic yoke, a side of the stator away from the first magnetic yoke facing the second support surface, the second support surface being used to support a table surface;

2. The primary assembly includes a plurality of primary units, the plurality of primary units being distributed on the first magnetic yoke along an extension direction of the first magnetic yoke; 2. The direct drive system according to claim 1, wherein each of the primary units includes a coil and an iron core, the iron core is fixed to the first magnetic yoke, and the coil is fitted around the iron core.

3. the secondary assembly includes a second magnetic yoke and a magnetic body, an even number of the magnetic bodies are provided on the second magnetic yoke, and two adjacent magnetic bodies have opposite polarities; The magnetic flux passes through the first magnetic body, the first iron core, the first magnetic yoke, the second iron core, the second magnetic body, and the second magnetic steel in this order before flowing into the first magnetic body, thereby forming a magnetic field loop.

3. The direct drive system according to claim 2, wherein the first magnetic body and the second magnetic body are adjacent to each other, and the first iron core and the second iron core are adjacent to each other.

4. 3. The direct drive system of claim 2, wherein the first magnetic yoke includes predetermined segments extending along a circular arc.

5. 5. The direct drive system according to claim 4, wherein a plurality of primary units are distributed at intervals in the predetermined segment, and any two adjacent primary units form a predetermined included angle.

6. 3. The direct drive system of claim 2, further comprising a base and a support base, wherein the stator is fixed to the support base and the support base is fixed to the base.

7. Further, the position regulation assembly includes a slider and a guide rail; 7. The direct drive system according to claim 6, wherein the guide rail is fixed to the base, the guide rail extends along a direction in which the plurality of primary units are distributed, and the slider is fixed to the mover, the slider is attached to the guide rail, and is movable along the direction in which the guide rail extends.

8. a groove is provided in the movable element, a portion of the stator is fitted into the groove, and an inner wall of the groove forms a first support surface; 8. The direct drive system according to claim 7, wherein the second support surface is formed by an outer wall of the groove, and the first support surface and the second support surface face in the same direction.

9. 9. The direct drive system according to claim 8, wherein a second gap is formed between the stator and an inner wall of the groove that faces the first support surface.

10. the slider includes a first slide groove and a second slide groove facing each other, and the guide rail includes a first protrusion and a second protrusion extending in opposite directions; 8. The direct drive system according to claim 7, wherein the first protrusion is fitted into the first slide groove, and the second protrusion is fitted into the second slide groove.

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