Linear Drive

Abstract

The present invention discloses a linear drive device. [Solution] The linear drive device includes a stator, a mover, a first position feedback unit, a driver, and a controller, the stator includes a stator body and a plurality of coils fixed to the stator body, at least some of the coils arranged in series are arranged in parallel or in series, the mover includes a mover body supported by the stator body and a magnet steel fixed to the mover body, the first position feedback unit is fixed to the mover body, there are a plurality of drivers, the plurality of coils arranged in series or in parallel as one set are electrically connected to one of the drivers, the remaining coils not arranged in series or in parallel are divided into a plurality of sets, and the plurality of coils of each set are electrically connected to another one of the drivers, and the controller is electrically connected to the plurality of drivers. The linear drive device in the present invention can not only save the number of drivers used, but also reduce the cost of the linear drive device and the difficulty of controlling the entire control system.

Description

[Technical field]

[0001] The present invention relates to the field of linear drive technology, and in particular to linear drive devices. [Background technology]

[0002] A linear drive device is a motion device for driving a mover to move along a straight line, and includes a stator consisting of a plurality of coils, a mover slidably connected to the stator and made of magnetic steel, a plurality of drivers for driving and controlling each of the coils, and a controller connected to each of the multiple drivers.

[0003] In the conventional linear driving device, there is no need to install other stations at some locations, and it is only necessary to drive the mover to move by the coil, and precise driving control and cooperative control are not required.

[0004] However, in practical use, a linear drive device has one driver for each coil, which results in the waste of multiple drivers for multiple coils that do not require precise control, which increases the cost of the linear drive device and makes it difficult to control the entire control system. Summary of the Invention [Problem to be solved by the invention]

[0005] The technical problem that the present invention aims to solve is how to provide a linear drive device that solves the problems of conventional linear drive devices, such as wasting drivers, high costs, and high difficulty of control, caused by installing one driver for each coil. [Means for solving the problem]

[0006] The present invention provides a linear driving device, the linear driving device comprising a stator, a mover, a first position feedback unit, a driver and a controller; The stator includes a stator body and a plurality of coils fixed to the stator body and sequentially arranged along an extension direction of the stator body, and at least a portion of the coils sequentially arranged are installed in series or in parallel, The mover includes a mover body supported by and slidably connected to the stator body, and a magnet steel fixed to the mover body and disposed directly opposite and spaced from the coil; the first position feedback unit is fixed to a side of the mover body closer to the stator, There are a plurality of drivers, and a plurality of the coils arranged in series or parallel as one set are electrically connected to one of the drivers, and the remaining coils that are not arranged in series or parallel are divided into a plurality of sets, and the plurality of coils in each set are electrically connected to another one of the drivers, Each set of coils arranged in series or parallel includes M N coils, and each set of coils not arranged in series or parallel includes N coils, where M≧2 and N≧3; The controllers are each electrically connected to a plurality of the drivers, and the controllers obtain position information of the mover through the first position feedback unit.

[0007] Furthermore, the driver is electrically connected to the coil via the first cable.

[0008] Furthermore, the mover further comprises a permeable body fixed to a side of the mover body closer to the stator, the magnet steel is present in a plurality of pieces and is fixed at intervals to the side of the permeable body closer to the stator, and the first position feedback unit is fixed to the side of the mover body closer to the stator and is installed at an interval from the permeable body.

[0009] Furthermore, the stator further comprises two guide rails fixed to the side of the stator body closer to the movable member and spaced apart from each other, the two guide rails being arranged along the extension direction of the stator body, the coil being fixed to the side of the stator body closer to the movable member and positioned between the two guide rails, the movable member further includes two sliders fixed to the side of the movable member body closer to the stator and spaced apart from each other, the two sliders being supported by and slidably connected to the two guide rails, respectively, and the magnetic body being positioned between the two sliders.

[0010] Furthermore, the stator further includes a plurality of cores arranged to abut sequentially, each of the cores including a flat plate portion fixed to the side of the stator body closer to the movable member, and a plurality of extension portions formed to protrude and extend from the side of the flat plate portion closer to the movable member toward the movable member and spaced apart from one another, each of the coils being fitted externally onto one of the extension portions, and a plurality of the coils arranged in series or parallel as a set to form a series or parallel arrangement are fixed to the same core, and the plurality of the coils of each set that are not arranged in series or parallel are fixed to the same core.

[0011] Furthermore, the controller obtains the position information of the mover fed back by the first position feedback unit through non-inductive control or frequency conversion control.

[0012] Furthermore, the linear drive device further includes a plurality of second position feedback units fixed at intervals on a side of the stator body closer to the movable member, the second position feedback units being electrically connected to the controller, and when the first position feedback unit moves so as to be directly opposite the second position feedback unit, the second position feedback unit reads out position information from the first position feedback unit and feeds back the position information from the first position feedback unit to the controller so that the controller can obtain position information of the movable member.

[0013] Furthermore, the second position feedback unit is electrically connected to the controller via a second cable.

[0014] Furthermore, the linear drive device further includes a signal processing module, and the second position feedback unit is electrically connected to the signal processing module via a third cable and electrically connected to the driver via the signal processing module. Effect of the Invention

[0015] Compared with the prior art, the linear driving device of the present invention installs at least some of the coils as stators in series or parallel, and electrically connects the multiple coils installed in series or parallel with one driver, so that the multiple coils that do not require precise control are integrated into one low-demand module in series or parallel, and then driven and controlled by a driver with higher power, thus not only saving the number of drivers used, but also reducing the cost of the linear driving device and reducing the difficulty of controlling the entire control system. [Brief description of the drawings]

[0016] In order to more clearly describe the technical solutions in the prior art or embodiments of the present invention, the drawings necessary for describing the prior art or embodiments of the present invention will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without making any inventive efforts. [Figure 1] FIG. 1 is an exploded view of a first linear drive device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing an overall configuration of a first linear driving device according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. [Figure 4] FIG. 4 is a diagram showing an overall configuration of a second linear drive device according to an embodiment of the present invention. [Diagram 5] FIG. 5 is a cross-sectional view taken along line BB in FIG. [Figure 6] FIG. 6 is a schematic diagram of a drive control in the second linear drive device according to the embodiment of the present invention. [Explanation of symbols]

[0017] 100: Linear drive unit 1: Stator 11: Coil 12: Stator body 13: Guide rail 14: Core 141: Flat plate part 142: Extension part 2: Mover 21: Magnet steel 22: Mover body 23: Magnetizer 24: Slider 3: First position feedback unit 4: Driver 41: First cable 42: Second cable 5: Controller 6: Second position feedback unit DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] In order to make the objectives, technical solutions and advantages of the present application clearer and easier to understand, the present invention will be further described in detail below in combination with the embodiments and corresponding drawings. It should be understood that the specific embodiments described herein are only used to illustrate the present invention, and do not limit the present invention.

[0019] In an embodiment of the present invention, a linear driving device 100 is provided. As shown in FIGS. 1 to 6, the linear driving device 100 includes a stator 1, a mover 2, a first position feedback unit 3, a driver 4, and a controller 5.

[0020] Here, the stator 1 comprises a stator body 12 and a plurality of coils 11 fixed to the stator body 12 and arranged sequentially along the extension direction of the stator body 12, and at least some of the consecutively arranged coils 11 are installed in series or parallel.

[0021] In addition to being electrically connected between the multiple coils 11 arranged in series or parallel as a set, the multiple coils 11 that are not arranged in series or parallel are insulated from each other, and at the same time, the coils 11 arranged in series or parallel as a set are insulated from the coils 11 that are not arranged in series or parallel.

[0022] The mover 2 comprises a mover body 22 supported by and slidably connected to the stator body 12, and a magnet steel 21 fixed to the mover body 22 and disposed directly opposite the coil 11 with a gap therebetween.

[0023] The first position feedback unit 3 is fixed to the side of the mover body 22 close to the stator 1 .

[0024] There are multiple drivers 4, and multiple coils 11 arranged in series or parallel as one set are electrically connected to one of the drivers 4, while the remaining coils 11 that are not arranged in series or parallel are divided into multiple sets, and the multiple coils 11 in each set are electrically connected to another driver 4.

[0025] Each set of coils arranged in series or parallel includes MN coils 11, and each set of coils not arranged in series or parallel includes N coils 11, where M≧2, N≧3, and M and N are both integers.

[0026] That is, each set of coils arranged in series or parallel includes at least six coils 11, or an integer multiple of 2 x 3 or greater, or an integer multiple of 3 x 2 or greater, and each set of coils not arranged in series or parallel also includes at least three coils 11.

[0027] The controllers 5 are each electrically connected to the multiple drivers 4 , and the controllers 5 obtain position information of the mover 2 by the first position feedback unit 3 .

[0028] In this embodiment, the driver 4 is electrically connected to the coil 11 via a first cable 41 .

[0029] In this embodiment, the mover 2 further includes a permeable body 23 fixed to the side of the mover body 22 closer to the stator 1, the magnet steel 21 is provided in plurality and fixed at intervals on the side of the permeable bodies 23 closer to the stator 1, and the first position feedback unit 3 is fixed to the side of the mover body 22 closer to the stator 1 and installed at an interval from the permeable bodies 23. By installing them in this manner, it is easy to fix the magnet steel 21, and the magnetic field effect formed by the magnet steel 21 and the coil 11 can be enhanced.

[0030] In this embodiment, the stator 1 further includes two guide rails 13 fixed to the side of the stator body 12 close to the mover 2 and installed at a distance from each other. The two guide rails 13 are provided along the extension direction of the stator body 12, and the coil 11 is fixed to the side of the stator body 12 close to the mover 2 and located between the two guide rails 13. The mover 2 further includes two sliders 24 fixed to the side of the mover body 22 close to the stator 1 and installed at a distance from each other, and the two sliders 24 are supported by and slidably connected to the two guide rails 13, respectively, and the magnetically permeable body 23 is located between the two sliders 24. By installing them in this manner, it becomes easy for the mover body 22 to be slidably supported by the stator body 12, and the sliding effect between them can be improved.

[0031] In this embodiment, the stator 1 further includes a plurality of cores 14 arranged to abut against each other in sequence, and each core 14 includes a flat plate portion 141 fixed to the side of the stator body 12 close to the mover 2, and a plurality of extension portions 142 formed to protrude and extend from the side of the flat plate portion 141 close to the mover 2 toward the mover 2 and provided at intervals. Each coil 11 is fitted and fixed to one extension portion 142, and a plurality of coils 11 arranged in series or parallel as one set to form a series or parallel connection are fixed to the same core 14, and a plurality of coils 11 of each set that are not arranged in series or parallel are fixed to the same core 14 and insulated from each other. By installing in this manner, the coils 11 can be easily attached and fixed, and the connection between the plurality of coils 11 arranged in series or parallel can be easily performed.

[0032] In this embodiment, the controller 5 obtains the position information fed back by the first position feedback unit 2 through non-inductive control or frequency conversion control.

[0033] In this embodiment, multiple coils 11 that do not require precise control are integrated into one module by being arranged in series or parallel, and then the multiple coils 11 in this module are driven and controlled by one driver 4 that has the stronger power among them.

[0034] The operating principle of the linear drive device 100 in this embodiment is that the magnet steel 21 induces a magnetic field, generating an air gap magnetic field between it and the coil 11; when an appropriate current is introduced into the coil 11, the coil 11 can generate a traveling wave magnetic field, generating a thrust between the magnet steel 21 and the coil 11, thereby causing the mover 2 to slide along the stator 1.

[0035] When the first position feedback unit 3 of the mover 2 passes through the corresponding area, the controller 5 operates in a non-inductive control or frequency conversion control manner for this area, so as to cooperate with the first position feedback unit 3 to obtain position information of the mover 2.

[0036] Compared with the prior art, the linear driving device 100 in this embodiment installs at least some of the coils 11 as the stator 1 in series or parallel, and electrically connects the multiple coils 11 installed in series or parallel to one driver 4, so that the multiple coils 11 that do not require precise control are integrated into one low-demand module in series or parallel, and then driven and controlled by the driver 4 with higher power, thus not only saving the number of drivers 4 used, but also reducing the cost of the linear driving device 100 and reducing the difficulty of controlling the entire control system.

[0037] As another optional embodiment of the present invention, as shown in Figures 4 to 6, the linear drive device 100 further includes a plurality of second position feedback units 6 fixed at intervals on the side of the stator body 12 closer to the movable element 2, and the second position feedback units 6 are electrically connected to the controller 6.

[0038] When the first position feedback unit 3 moves so as to be directly opposite the second position feedback unit 6, the second position feedback unit 6 reads out the position information from the first position feedback unit 3 and feeds back the position information from the first position feedback unit 3 to the controller 5 so that the controller 5 can obtain the position information of the mover 2. In other words, the position information fed back by the first position feedback unit 3 is the position information of the mover 2.

[0039] In this embodiment, the first position feedback unit 3 is a grid ruler, and the second position feedback unit 6 is a read head of the grid ruler. The controller 5 does not obtain the position information of the mover 2 fed back by the first position feedback unit 3 by non-guided control or frequency conversion control, but obtains it by reading it out by the second position feedback unit 6 instead.

[0040] In this embodiment, the second position feedback unit 6 is electrically connected to the controller 5 via a second cable 42 .

[0041] In addition, the linear drive device 100 further includes a signal processing module (not shown), in which the second position feedback unit 6 is first electrically connected to the signal processing module via a third cable, and then electrically connected to the driver 4 via the signal processing module, where the signal processing module is also electrically connected to the driver 4 via the third cable.

[0042] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the scope of protection of the present invention.

Claims

1. The present invention includes a stator, a mover, a first position feedback unit, a driver, and a controller, The stator includes a stator body and a plurality of coils fixed to the stator body and sequentially arranged along an extension direction of the stator body, and at least a portion of the coils sequentially arranged are installed in series or parallel, The mover includes a mover body supported by and slidably connected to the stator body, and a magnet steel fixed to the mover body and disposed directly opposite and spaced from the coil; the first position feedback unit is fixed to a side of the mover body close to the stator, There are a plurality of drivers, and a plurality of the coils arranged in series or parallel as one set are electrically connected to one of the drivers, and the remaining coils that are not arranged in series or parallel are divided into a plurality of sets, and the plurality of coils in each set are electrically connected to another one of the drivers, Each set of coils arranged in series or parallel includes M N of said coils, and each set of coils not arranged in series or parallel includes N of said coils, where M > 2 and N > 3; Each of the controllers is electrically connected to a plurality of the drivers, and the controllers obtain position information of the mover through the first position feedback unit. A linear drive device characterized by:

2. The driver is electrically connected to the coil via the first cable.

2. The linear drive device according to claim 1 .

3. The mover further includes a magnetic body fixed to a side of the mover body close to the stator, the magnet steel is present in a plurality of pieces and is fixed to the side of the magnetic body close to the stator at intervals, and the first position feedback unit is fixed to the side of the mover body close to the stator and is installed at an interval from the magnetic body.

2. The linear drive device according to claim 1 .

4. the stator further comprises two guide rails fixed to a side of the stator body close to the mover and spaced apart from each other, the two guide rails being provided along an extension direction of the stator body, the coil being fixed to a side of the stator body close to the mover and positioned between the two guide rails, the mover further comprises two sliders fixed to a side of the mover body close to the stator and spaced apart from each other, the two sliders being supported by and slidably connected to the two guide rails, respectively, and the magnetic body being positioned between the two sliders.

4. The linear drive device according to claim 3.

5. The stator further comprises a plurality of cores arranged to abut in sequence, each of the cores comprising a flat plate portion fixed to the side of the stator body closer to the mover, and a plurality of extending portions formed to protrude and extend from the side of the flat plate portion closer to the mover toward the mover and provided at intervals, each of the coils being fitted and fixed to the outside of one of the extending portions, the plurality of coils arranged in series or parallel as one set to form a series or parallel arrangement are fixed to the same core, and the plurality of coils of each set that are not arranged in series or parallel are fixed to the same core.

5. The linear drive device according to claim 4.

6. The controller obtains the position information of the mover fed back by the first position feedback unit through non-inductive control or frequency conversion control.

2. The linear drive device according to claim 1 .

7. the linear drive device further comprises a plurality of second position feedback units fixed at intervals on a side of the stator body close to the mover, the second position feedback units being electrically connected to the controller, and when the first position feedback unit moves so as to be directly opposite the second position feedback unit, the second position feedback unit reads out position information from the first position feedback unit and feeds back the position information from the first position feedback unit to the controller so that the controller can obtain position information of the mover.

2. The linear drive device according to claim 1 .

8. the second position feedback unit is electrically connected to the controller via a second cable; 8. The linear drive device according to claim 7.

9. the linear drive device further includes a signal processing module, the second position feedback unit is electrically connected to the signal processing module via a third cable, and is electrically connected to the driver via the signal processing module; 8. The linear drive device according to claim 7.

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