Linear drive device

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 belongs to the field of linear drive technology, and particularly relates to a linear drive device.

Background Art

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

[0003] In a conventional linear drive device, there is no need to install other stations in some places, and it is only necessary to drive the mover to move by the coils, without requiring precise drive control and cooperative control.

[0004] However, in actual use, since one driver is installed for each coil in the linear drive device, a large number of drivers are wasted due to a plurality of coils that do not require precise control, resulting in a high cost of the linear drive device and difficulty in controlling the entire control system.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The technical problem to be solved by the present invention is how to provide a linear drive device to solve the problems of the conventional linear drive device, which wastes drivers due to installing one driver for each coil, resulting in high costs and high control difficulty.

Means for Solving the Problems

[0006] The present invention is realized as follows. The present invention provides a linear drive device, which 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 the extending direction of the stator body. At least a part of the continuously arranged coils is installed in series or in parallel. The mover includes a mover body supported by the stator body and slidably connected thereto, and a magnet steel fixed to the mover body and installed facing the coil with a gap therebetween. The first position feedback unit is fixed to the side of the mover body close to the stator. There are a plurality of the drivers, and a plurality of the coils installed in series or in parallel as a set are electrically connected to one of the drivers, and the remaining coils not installed in series or in parallel are divided into a plurality of sets, and a plurality of the coils in each set are electrically connected to another one of the drivers. Each set of coils installed in series or in parallel includes MN of the coils, and each set of coils not installed in series or in parallel includes N of the coils, where M≥2 and N≥3. Each of the controllers is electrically connected to the plurality of drivers, and the controller acquires the position information of the mover by the first position feedback unit.

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

[0008] Furthermore, the mover further includes a permeable body fixed to the side of the mover body close to the stator, there are a plurality of the magnet steels, and they are fixed to the side of the permeable body close to the stator with a gap therebetween, and the first position feedback unit is fixed to the side of the mover body close to the stator and installed with a gap from the permeable body.

[0009] Furthermore, the stator further includes two guide rails that are fixed to the side of the stator body close to the mover and are arranged at intervals from each other. The two guide rails are provided along the extending direction of the stator body. The coil is fixed to the side of the stator body close to the mover and is located between the two guide rails. The mover further includes two sliders that are fixed to the side of the mover body close to the stator and are arranged at intervals from each other. The two sliders are respectively supported by the two guide rails and are slidably connected. The permeable body is located between the two sliders.

[0010] Furthermore, the stator further includes a plurality of cores that are arranged to be sequentially in contact with each other. Each core includes a flat plate portion that is fixed to the side of the stator body close to the mover, and a plurality of extending portions that are formed to protrude and extend from the side of the flat plate portion close to the mover in the direction of the mover and are provided at intervals. Each coil is externally fitted and fixed to one of the extending portions. A plurality of the coils that are arranged in series or in parallel as a set to form a series or parallel connection are fixed to the same core. A plurality of the coils of each set that are not arranged in series or in parallel are fixed to the same core.

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

[0012] Furthermore, the linear drive device further includes a plurality of second position feedback units fixedly installed at an interval on the side of the stator body close to the mover, the second position feedback units are electrically connected to the controller, and when the first position feedback unit moves so as to face the second position feedback unit, the second position feedback unit reads the 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 the position information of the mover.

[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, 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.

Advantages of the Invention

[0015] Compared with the prior art, the linear drive device in the present invention installs at least some of the coils as the stator in series or in parallel, and electrically connects the plurality of coils installed in series or in parallel to one driver, so that a plurality of coils that do not require precise control are integrated as one module with low requirements by series or parallel, and then are driven and controlled by a driver with larger power. In this way, not only the number of drivers used can be saved, but also the cost of the linear drive device can be reduced, and the difficulty of controlling the entire control system can be decreased.

Brief Description of the Drawings

[0016] To more clearly explain the technical solutions in the prior art or the embodiments of the present invention, the drawings necessary for the description of the prior art or the 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 creative efforts.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Description of Reference Numerals

[0017] 100: Linear drive device 1: Stator 11: Coil 12: Stator body 13: Guide rail 14: Core 141: Flat plate portion 142: Extension portion 2: Mover 21: Magnet steel 22: Mover body 23: Magnetizer 24: Slider 3: First position feedback unit 4: Driver 41: First cable [[ID=�8]]42: Second cable 5: Controller 6: Second Position Feedback Unit

Embodiment for Carrying Out the Invention

[0018] In order to make the object, technical solution and advantages of the present application clearer and easier to understand, the present invention will be described in more detail below by combining embodiments and corresponding drawings. It should be understood that the specific embodiments described here are only used to explain the present invention and do not limit the present invention.

[0019] In an embodiment of the present invention, a linear drive device 100 is provided. As shown in FIGS. 1 to 6, the linear drive 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 includes a stator main body 12 and a plurality of coils 11 fixed to the stator main body 12 and sequentially arranged along the extending direction of the stator main body 12. At least a part of the continuously arranged coils 11 are installed in series or in parallel.

[0021] In addition to being electrically connected between a plurality of coils 11 installed in series or in parallel as a set, the plurality of coils 11 not installed in series or in parallel are insulated from each other. At the same time, the coils 11 installed in series or in parallel as a set and the coils 11 not installed in series or in parallel are insulated from each other.

[0022] The mover 2 includes a mover main body 22 supported by the stator main body 12 and slidably connected thereto, and a magnet steel 21 fixed to the mover main body 22 and facing the coil 11 with a gap therebetween.

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

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

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

[0026] That is, each set of coils installed in series or in parallel includes at least 6 coils 11, or an integer multiple of 2×3 or more coils 11, or an integer multiple of 3×2 or more coils 11, and each set of coils not installed in series or in parallel also includes at least 3 coils 11.

[0027] Each controller 5 is electrically connected to a plurality of drivers 4, and the controller 5 acquires the 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 the 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 close to the stator 1. There are a plurality of magnet steels 21, and they are fixed at intervals on the side of the permeable body 23 close to the stator 1. The first position feedback unit 3 is fixed to the side of the mover body 22 close to the stator 1 and is installed at an interval from the permeable body 23. By installing in this way, 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 that are fixed to the side of the stator body 12 close to the mover 2 and are arranged at intervals from each other. The two guide rails 13 are provided along the extending direction of the stator body 12. The coil 11 is fixed to the side of the stator body 12 close to the mover 2 and is located between the two guide rails 13. The mover 2 further includes two sliders 24 that are fixed to the side of the mover body 22 close to the stator 1 and are arranged at intervals from each other. The two sliders 24 are respectively supported by the two guide rails 13 and are slidably connected. The permeable magnet 23 is located between the two sliders 24. By installing in this way, it becomes easy for the mover body 22 to be slidably supported by the stator body 12, and the sliding effect between the two can be improved.

[0031] In this embodiment, the stator 1 further includes a plurality of cores 14 that are arranged to be in contact with each other in sequence. Each core 14 includes a flat plate portion 141 that is fixed to the side of the stator body 12 close to the mover 2, and a plurality of extending portions 142 that are formed to protrude and extend from the side of the flat plate portion 141 close to the mover 2 in the direction of the mover 2 and are provided at intervals from each other. Each coil 11 is externally fitted and fixed to one extending portion 142. A plurality of coils 11 that are installed in series or in parallel as a set to form a series or parallel connection are fixed to the same core 14. The plurality of coils 11 of each set that are not installed in series or in parallel are fixed to the same core 14 and are insulated from each other. By installing in this way, the installation and fixation of the coil 11 become easy, and the connection between the plurality of coils 11 installed in series or in parallel becomes easy.

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

[0033] In this embodiment, a plurality of coils 11 that do not require precise control are integrated as one module so as to be installed in series or in parallel, and then, the plurality of coils 11 in this module are driven and controlled by one driver 4 with more powerful 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, generates an air-gap magnetic field between the magnet steel 21 and the coil 11, and when an appropriate current is introduced into the coil 11, the coil 11 can generate a traveling-wave magnetic field, generate a thrust between the magnet steel 21 and the coil 11, and thereby, the mover 2 slides along the stator 1.

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

[0036] Compared with the prior art, in the linear drive device 100 in this embodiment, at least some of the coils 11 as the stator 1 are installed in series or in parallel, and by electrically connecting the plurality of coils 11 installed in series or in parallel to one driver 4, the plurality of coils 11 that do not require precise control are integrated as one module with low requirements by series or parallel connection, and then, are driven and controlled by a driver 4 with greater power. In this way, not only the number of drivers 4 used can be saved, but also the cost of the linear drive device 100 can be reduced, and the difficulty of control of the entire control system can be lowered.

[0037] As another selectable embodiment of the present invention, as shown in FIGS. 4 to 6, the linear drive device 100 further includes a plurality of second position feedback units 6 fixedly installed at intervals on the side of the stator body 12 close to the mover 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 face the second position feedback unit 6, the second position feedback unit 6 reads 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 acquire the position information of the mover 2. That is, 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 stops acquiring the position information of the mover 2 fed back by the first position feedback unit 3 by non-contact control or frequency conversion control, and instead acquires it by reading it by the second position feedback unit 6.

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

[0041] Further, the linear drive device 100 further includes a signal processing module (not shown). In this case, the second position feedback unit 6 is first electrically connected to the signal processing module via the third cable, and then electrically connected to the driver 4 via the signal processing module. Here, 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 do not limit the present invention. Any changes, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A linear drive device comprising a stator, a mover, a first position feedback unit, a driver, and a controller, wherein the stator includes a stator body and a plurality of coils fixed to the stator body and sequentially arranged along the extending direction of the stator body, and at least a part of the continuously arranged coils is installed to be electrically connected in series or in parallel, the mover includes a mover body supported by the stator body and slidably connected thereto, and a magnet steel fixed to the mover body and installed facing the coils with a gap therebetween, the first position feedback unit is fixed to the side of the mover body close to the stator, the driver includes a first driver and a second driver having a greater power than the first driver, and a plurality of the coils installed to be electrically connected in series or in parallel as one set are electrically connected to the second driver, and the remaining coils installed not to be electrically connected in series or in parallel are divided into a plurality of sets, and a plurality of the coils in each set installed not to be electrically connected in series or in parallel are electrically connected to the first driver, each set of coils installed to be electrically connected in series or in parallel includes M×N of the coils, each set of coils installed not to be electrically connected in series or in parallel includes N of the coils, where M≥2 and N≥3, and each set of coils installed to be electrically connected in series or in parallel does not require more precise control than each set of coils installed not to be electrically connected in series or in parallel, the controllers are each electrically connected to the plurality of drivers, and the controller acquires position information of the mover by the first position feedback unit, characterized in that.

2. The driver is electrically connected to the coil via a first cable. The linear drive device according to claim 1, characterized in that.

3. The mover further includes a magnetic permeable body fixed to the side of the mover body closer to the stator. There are a plurality of magnet steels, and they are fixed at intervals on the side of the magnetic permeable body closer to the stator. 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 magnetic permeable body. The linear drive device according to claim 1, characterized in that.

4. The stator further includes two guide rails fixed to the side of the stator body closer to the mover and installed at intervals from each other. The two guide rails are provided along the extending direction of the stator body. The coil is fixed to the side of the stator body closer to the mover and is located between the two guide rails. The mover further includes two sliders fixed to the side of the mover body closer to the stator and installed at intervals from each other. The two sliders are respectively supported by the two guide rails and are slidably connected. The magnetic permeable body is located between the two sliders. The linear drive device according to claim 3, characterized in that.

5. The stator further includes a plurality of cores installed so as to be in sequential contact. Each core includes 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 in the direction of the mover and provided at intervals. Each coil is externally fitted and fixed to one of the extending portions. A plurality of the coils installed in series or in parallel as a set to form a series or parallel connection are fixed to the same core. A plurality of the coils of each set not installed in series or in parallel are fixed to the same core. The linear drive device according to claim 4, characterized in that.

6. The controller acquires the position information of the mover fed back by the first position feedback unit by non-inductive control or frequency conversion control. The linear drive device according to claim 1, characterized in that.

7. The linear drive device further includes a plurality of second position feedback units fixedly arranged at intervals on the side of the stator body close to the mover. The second position feedback units are electrically connected to the controller. When the first position feedback unit moves such that it faces the second position feedback unit, the second position feedback unit reads the 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 the position information of the mover. The linear drive device according to claim 1, characterized in that.

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

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. The linear drive device according to claim 7, characterized in that.

Images