Linear Motors

Abstract

The present invention provides a linear motor, which includes a motor frame, a plurality of guide shafts fixed on both sides of the motor frame, a plurality of stator plates arranged in sequence in the motor frame, and a mover plate sandwiched between adjacent stator plates, wherein the stator plate includes a plurality of magnets distributed in an array, the mover plate includes a plurality of coils that react with the magnets to generate a magnetic field, and guide blocks fixed on both sides of the plate body, wherein the guide shafts are passed through the guide blocks and are slidably connected to the guide blocks. The linear motor provided by the present invention, by arranging guide blocks on both sides of the plate body of the mover plate and fixing guide shafts on both sides of the motor frame, enables the plate body to drive the guide blocks to slide on the guide shafts, and the volume occupied by such a guide structure is relatively small; in addition, the stator plates and the mover plates are arranged in sequence, which greatly saves space and reduces the size of the motor frame.

Description

Technical Field

[0001] The invention belongs to the technical field of textile equipment, and more specifically, relates to a linear motor. Background Art

[0002] Weaving is a key link in the textile manufacturing industry. Looms are widely used in the textile industry. Looms include five major movements: opening, weft insertion, weft beating, winding, and warp feeding. The opening mechanism that controls the opening movement is used to separate the warp yarns up and down to form a shed for weft insertion. The opening mechanism is a key structure to control the movement of the loom. The working efficiency of the opening machine directly affects the production holes, product adaptability and fabric quality of the loom. The common opening mechanisms on the market are mainly: cam opening mechanism, connecting rod opening mechanism, multi-arm opening mechanism, jacquard opening mechanism. Correspondingly, each opening mechanism has its limitations and disadvantages. For example, the multi-arm opening mechanism has a very complex structure, too high manufacturing precision requirements, too thin parts, huge impact resistance, and difficult maintenance.

[0003] At present, some foreign companies are researching servo-driven textile heald frame opening mechanisms. However, due to the servo drive's characteristic of converting the motor's rotational motion into linear motion, the servo-driven textile heald frame's overall structure is relatively complex, easy to damage, large in size, and inefficient, and cannot meet production needs. With the increasing demand for customized, small-batch, and multi-color fabrics, the market is in urgent need of an intelligent opening machine that can replace traditional opening structures such as multi-arm opening mechanisms. Linear motor-driven opening mechanisms have emerged, but the existing linear motors must be guided by linear guides outside the linear motors, resulting in an overall motor that is too large and cannot be installed in the limited space of a loom heald frame center distance of only 12 mm. Summary of the invention

[0004] The purpose of the present invention is to provide a linear motor to solve the technical problem in the prior art that the linear motor is too large to be installed in a limited space.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a linear motor, including a motor frame, a plurality of guide shafts fixed on both sides of the motor frame, a plurality of stator plates arranged in sequence in the motor frame, and a mover plate clamped between adjacent stator plates, the stator plate including a plurality of magnets distributed in an array, the mover plate including a plate body, a plurality of coils fixed on the plate body and acting with the magnets to generate a magnetic field, and guide blocks fixed on both sides of the plate body, the guide shafts passing through the guide blocks and being slidably connected to the guide blocks.

[0006] Furthermore, the stator plate also includes a magnet frame having a plurality of square slots, and cover plates fixed to both sides of the magnet frame, the magnets are arranged in the square slots in a one-to-one correspondence, and each of the magnets is sandwiched between two of the cover plates.

[0007] Furthermore, the magnets are distributed in a two-dimensional array, and in each column of the magnets, the magnetic poles of adjacent magnets facing the same side of the mover plate are opposite.

[0008] Furthermore, a plurality of coil slots are provided on the plate body, the coil slots are distributed in a two-dimensional array, and the coils are arranged in the coil slots in a one-to-one correspondence.

[0009] Furthermore, a ball linear bearing is provided between the guide block and the guide shaft.

[0010] Furthermore, buffer pads are provided at both ends of the guide shaft.

[0011] Furthermore, the motor frame includes an upper frame, a lower frame and two side plates arranged between the upper frame and the lower frame, and two ends of the guide shaft are respectively fixed to the upper frame and the lower frame.

[0012] Furthermore, the inner wall of the upper frame and the inner wall of the lower frame are both provided with positioning grooves for inserting the stator plate.

[0013] Furthermore, a pressure strip for pressing the stator plate is fixed to the upper frame, and a length direction of the pressure strip is the same as a thickness direction of the stator plate.

[0014] Furthermore, a notch is provided at one end of the guide shaft, and the end of the guide shaft extends into the lower frame. A fastening hole is also provided on the side wall of the lower frame, and a steel ball screw abutting against the side wall of the notch is provided in the fastening hole.

[0015] The beneficial effect of the linear motor provided by the present invention is that: compared with the prior art, the linear motor of the present invention arranges guide blocks on both sides of the plate body of the mover plate and fixes guide shafts on both sides of the motor frame, so that the plate body drives the guide blocks to slide on the guide shafts, thereby driving the movement of the heald frame. The guide device of this structure occupies a small volume and makes full use of the space on both sides of the mover plate and in the motor frame, reducing the volume of the linear motor; in addition, the stator plates are arranged in sequence in the motor frame, and the mover plate is clamped between the two stator plates. This arrangement method greatly saves space and reduces the size of the motor frame, so that it can be installed in the opening mechanism of the loom. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A three-dimensional structural diagram of a linear motor provided by an embodiment of the present invention;

[0018] Figure 2 A partial three-dimensional structural diagram of a linear motor provided by an embodiment of the present invention;

[0019] Figure 3 A three-dimensional structural diagram of a stator plate provided in an embodiment of the present invention;

[0020] Figure 4 An exploded structural diagram of a stator plate provided in an embodiment of the present invention;

[0021] Figure 5 A three-dimensional structural diagram of a mover plate provided in an embodiment of the present invention;

[0022] Figure 6 A three-dimensional structural diagram of an upper frame provided in an embodiment of the present invention;

[0023] Figure 7 A top view of a linear motor provided by an embodiment of the present invention;

[0024] Figure 8 A partial structural diagram of a guide shaft provided in an embodiment of the present invention.

[0025] Among them, the reference numerals in the figure are:

[0026] 1-motor frame; 11-upper frame; 110-mounting hole; 111-positioning block; 1110-positioning slot; 12-lower frame; 120-fastening hole; 13-side plate; 14-pressure strip; 15-guide shaft pressure plate; 2-statator plate; 21-magnet frame; 210-square slot; 211-notch; 22-magnet; 23-cover plate; 3-moving plate; 31-plate body; 310-coil slot; 32-coil; 321-connection bus; 33-guide block; 330-through hole; 34-parallel outlet plate; 4-guide shaft; 41-notch; 5-buffer pad; 6-magnetic scale reading head. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] Please also read Figure 1 and Figure 2, the linear motor provided by the present invention is now described. The linear motor is used in mechanisms such as looms. For example, the linear motor is used in the opening structure of the loom to drive the movement of the heald frame. The linear motor includes a motor frame 1, a guide shaft 4, a stator plate 2 and a mover plate 3. There are multiple stator plates 2, which are arranged in sequence in the motor frame 1 and fixed on the motor frame 1. In this embodiment, the stator plates 2 are arranged vertically and the stator plates 2 are parallel to each other. The stator plate 2 includes a plurality of magnets 22, and the magnets 22 are distributed in an array. The mover plate 3 is sandwiched between two adjacent stator plates 2. The mover plate 3 includes a plate body 31 and a coil 32 fixed on the plate body 31. The coil 32 on the mover plate 3 interacts with the magnet 22 to generate a magnetic field. The magnetic field drives the mover plate 3 to move up and down, so that the mover plate 3 drives the heald frame to move. The stator plate 2 and the mover plate 3 are both arranged vertically, and are arranged in sequence in the manner of stator plate 2, mover plate 3, stator plate 2, mover plate 3, etc., so that the structure of the linear motor is more compact, greatly saving space and reducing the volume of the linear motor. Guide blocks 33 are fixed on both sides of the plate body 31, and the guide shaft 4 is inserted into the guide blocks 33 and slidably connected with the guide blocks 33. More specifically, the guide blocks 33 are fixed on the left and right sides of the plate body 31, and the guide shaft 4 is correspondingly fixed vertically on the left and right sides of the motor frame 1. The space on both sides of the motor frame 1 is used to install the guide device, thereby increasing the space utilization rate. The number of guide blocks 33 is equal to the number of guide shafts 4. Moreover, guide blocks 33 and guide shafts 4 are provided on both sides of the mover plate 3, which can make the movement of the mover plate 3 itself more stable. When the plate body 31 of the mover plate 3 moves, the guide block 33 moves accordingly, and its guide block 33 slides longitudinally on the guide shaft 4. The setting of the guide shaft 4 ensures the smooth movement of the guide block 33 and improves the manufacturing accuracy. The number of stator plates 2 and mover plates 3 is not limited here. The number of stator plates 2 is one more than the number of mover plates 3, which can be selected according to specific circumstances. For example, the number of stator plates 2 is 17, and the number of mover plates 3 is 16. The linear motor also includes a driver, which is used to control the current of the coil 32 in the mover plate 3. The driver can control multiple mover plates 3 to move as a whole, or can control one of the mover plates 3 separately to realize the needle selection of the textile machine, eliminate the complex and weak electromagnetic mechanical clutch, so that there is no high-speed clutch impact destructive force of the electromagnetic mechanical clutch in the motor, and the direct drive by the driver greatly simplifies the motor structure, reduces the wear and energy consumption of complex machinery. In addition, the core algorithm can be placed in the driver, so that the communication delay is less than 1 microsecond, the response speed is fast, and the restriction of communication delay on the high-speed movement of the opening mechanism is solved. In addition, the use of the matching mode of the coil 32 and the magnet 22 to drive the mover plate 3 generates less noise, reduces noise pollution, and improves the working environment of the textile factory.

[0032] Compared with the prior art, the linear motor provided by the present invention has guide blocks 33 arranged on both sides of the plate body 31 of the mover plate 3 and guide shafts 4 fixedly arranged on both sides of the motor frame 1, so that the plate body 31 drives the guide blocks 33 to slide on the guide shafts 4, thereby driving the movement of the heald frame. The guide device of this structure occupies a small volume and makes full use of the space on both sides of the mover plate 3 and in the motor frame 1, thereby reducing the volume of the linear motor. In addition, the stator plates 2 are arranged in sequence in the motor frame 1, and the mover plate 3 is clamped between the two stator plates 2. This arrangement method greatly saves space and reduces the size of the motor frame 1, so that it can be installed in the opening mechanism of the loom.

[0033] Please also read Figure 3 and Figure 4 As a specific embodiment of the linear motor provided by the present invention, the stator plate 2 also includes a magnet frame 21 having a plurality of square slots 210, and a cover plate 23 fixed on both sides of the magnet frame 21, and the magnets 22 are arranged in the square slots 210 one by one, and each magnet 22 is sandwiched between the two cover plates 23. The stator plate 2 includes a magnet frame 21, two cover plates 23 and a plurality of magnets 22, and the magnet frame 21 has a plurality of square slots 210, and the magnets 22 are arranged in the square slots 210 one by one, so that the magnets 22 on one stator plate 2 can be used by two adjacent mover plates 3, thereby reducing the number of magnets 22 and further reducing the space occupied by the linear motor. The cover plates 23 on both sides of the magnet 22 provide installation positions for the magnet 22, and the magnet 22 is attached to the cover plate 23, so that the structural strength of the stator plate 2 is higher and easier to install. Preferably, the thickness of the magnet frame 21 is the same as the thickness of the magnet 22, so that the cover plate 23 is attached to the magnet 22 and the magnet frame 21. The cover plate 23 is made of non-magnetic material to avoid affecting the magnetic field distribution between the stator plate 2 and the mover plate 3. Specifically, the cover plate 23 is made of non-magnetic or weakly magnetic stainless steel, such as 316 stainless steel.

[0034] See also Figure 3 and Figure 4 As a specific embodiment of the linear motor provided by the present invention, the magnets 22 are distributed in a two-dimensional array. In each column of magnets 22, the magnetic poles of adjacent magnets 22 facing the same rotor plate 3 are opposite. There are two columns of magnets 22 on the stator plate 2. More specifically, the arrangement direction of each column of magnets 22 is vertical. The two faces of the magnets 22 corresponding to the rotor plate 3 are N poles and S poles, respectively. In the same column of magnets 22 facing the same rotor plate 3, the magnetic poles of two adjacent magnets 22 are opposite. For example, the magnetic poles of one side of the same column of magnets 22 facing the same rotor plate 3 are N pole, S pole, N pole, S pole, etc., respectively. Please refer to Figure 4The pole distribution of the other row of magnets 22 is the same as that of the row of magnets 22. This pole arrangement can eliminate the normal magnetic attraction, avoid deformation of the stator plate 2, and make the mechanical structure of the motor more stable. The number of magnets 22 is not limited here.

[0035] See also Figure 5 As a specific embodiment of the linear motor provided by the present invention, a plurality of coil slots 310 are provided on the plate body 31, and the coil slots 310 are distributed in a two-dimensional array, and the coils 32 are arranged in the coil slots 310 one by one. The height of the plate body 31 is less than the height of the stator plate 2, so that the mover plate 3 can move freely up and down between the two stator plates 2. The coils 32 on the stator plate 2 are distributed in a two-dimensional array, and each column of coils 32 is arranged vertically and opposite to one of the columns of magnets 22, so that a double-sided coil 32 is formed, which effectively utilizes the space inside the motor frame 1 and increases the thrust it receives. At the same time, the coils 32 are connected in parallel, and a connection bus 321 is formed between the two columns of coils 32, and the connection bus 321 extends out of the plate body 31 and is connected to the driver. A parallel outlet plate 34 is provided at the edge of the plate body 31, and the connection bus 321 is arranged in the parallel outlet plate 34 to avoid friction between the connection bus 321 and the stator plate 2, and is used to protect the connection bus 321. In this embodiment, the coil 32 is a coreless coil. First, it can form a balanced double magnetic track for the mover plate 3, and there is no need to deal with attraction during installation, which is easier to align and install. Second, there is no cogging effect and the operation is extremely smooth. Third, the weight of the mover plate 3 is reduced, and it has a higher acceleration and a higher mechanical bandwidth.

[0036] See also Figure 1 and Figure 2 As a specific embodiment of the linear motor provided by the present invention, a ball linear bearing is provided between the guide block 33 and the guide shaft 4, so that the movement of the guide block 33 is smoother, the movement displacement of the guide block 33 is more accurate, and high-precision control of the heald frame is achieved, and the friction between the guide block 33 and the guide shaft 4 can be reduced. Furthermore, buffer pads 5 are sleeved at both ends of the guide shaft 4. When the guide block 33 moves to the end of the guide shaft 4, the buffer pads 5 can play a buffering role on the guide block 33, preventing the motor frame 1 from hitting the guide block 33 when the motor fails, thereby improving the reliability of the motor.

[0037] See also Figure 1As a specific embodiment of the linear motor provided by the present invention, the motor frame 1 includes an upper frame 11, a lower frame 12 and two side plates 13 arranged between the upper frame 11 and the lower frame 12, and the two ends of the guide shaft 4 are respectively fixed to the upper frame 11 and the lower frame 12. Specifically, the stator plate 2 and the mover plate 3 are parallel to the side plates 13 and are arranged in sequence between the two side plates 13. The positions of the two side plates 13 are set as the front side and the rear side, then the guide block 33 is fixed to the left and right sides of the plate body 31, and the guide shaft 4 is arranged on the left and right sides of the motor frame 1, and the guide block 33 slides longitudinally on the guide shaft 4. The two ends of the guide shaft 4 extend into the upper frame 11 and the lower frame 12 respectively, so that the guide shaft 4 has a stable structure, and the sliding displacement between it and the guide block 33 is more accurate. Furthermore, a magnetic scale reading head 6 is also provided on the side plate 13, which is used to detect the sliding displacement of each guide block 33, and feed back the displacement signal to the driver to form a closed-loop control of the mover plate 3.

[0038] See also Figure 1 , Figure 6 and Figure 7 As a specific embodiment of the linear motor provided by the present invention, the inner wall of the upper frame 11 and the inner wall of the lower frame 12 are both provided with positioning grooves 1110 for inserting the stator plate 2. Specifically, positioning grooves 1110 are provided on the left and right sides of the inner wall of the upper frame 11, and positioning grooves 1110 are also provided on the left and right sides of the inner wall of the lower frame 12. The number of positioning grooves 1110 is four times the number of stator plates 2. The upper end of the stator plate 2 is inserted into the positioning groove 1110 of the upper frame 11, and the lower end of the stator plate 2 is inserted into the positioning groove 1110 of the lower frame 12. The positioning groove 1110 supports, positions and fixes the stator plate 2. In another embodiment, a plurality of positioning blocks 111 are protruding from the inner walls of the upper frame 11 and the lower frame 12. The positioning blocks 111 are arranged in sequence on the left and right sides of the inner walls thereof, and positioning grooves 1110 for positioning the stator plate 2 are formed between adjacent positioning blocks 111.

[0039] See also Figure 1 , Figure 6 and Figure 7 As a specific embodiment of the linear motor provided by the present invention, the upper frame 11 is fixed with a pressure strip 14 for pressing the stator plate 2, and the length direction of the pressure strip 14 is the same as the thickness direction of the stator plate 2. In this embodiment, the pressure strip 14 is crimped to the upper side of each stator plate 2, and the pressure strip 14 and the stator plate 2 are perpendicular to each other. Of course, a pressure plate can also be provided on the lower side of the stator plate 2, and the pressure plate is fixed on the lower frame 12. The provision of the pressure plate further enhances the structural strength of the stator plate 2. Preferably, the upper pressure plate is fixed on the positioning block 111. In another embodiment, notches 211 are provided at the four corners of the magnet frame 21, and the two side surfaces of the magnet frame 21 are inserted into the positioning groove 1110, and one side of the pressure plate abuts against the side wall of the notch 211, so that the structure of the motor frame 1 can be made more compact.

[0040] See also Figure 1 , Figure 6 and Figure 7 As a specific embodiment of the linear motor provided by the present invention, a guide shaft 4 pressing plate 15 is also fixed on the upper frame 11. The guide shaft 4 extends into the upper frame 11, and the upper frame 11 is correspondingly provided with a mounting hole 110 for mounting the guide shaft pressing plate 15. The guide shaft pressing plate 15 is abutted against the upper frame 11 and fixedly connected to the guide shaft 4 by fasteners such as bolts, thereby fixing the guide shaft 4. Correspondingly, a guide shaft pressing plate 15 is also fixed on the lower frame 12.

[0041] See also Figure 1 and Figure 8 As a specific embodiment of the linear motor provided by the present invention, a notch is provided at one end of the guide shaft, and the end of the guide shaft extends into the lower frame, and a fastening hole is provided on the side wall of the lower frame, and a steel ball screw abutting against the side wall of the notch is provided in the fastening hole. The steel ball screw is fastened in the fastening hole, and its end abuts against the notch of the guide shaft. Under the abutment of the steel ball screw, the guide shaft can withstand a large bending moment. The mover plate has a large impact on the guide shaft when moving at high speed. The cooperation between the notch of the guide shaft and the steel ball screw can prevent the guide shaft from bending under long-term impact, thereby extending the service life of the guide shaft.

[0042] The linear motor can be applied to the opening mechanism of a loom, the opening structure of the loom includes a heald frame and the linear motor in any of the above embodiments, and the heald frame is connected one-to-one with the guide block 33. A through hole 330 is provided on the wire block, and the extension direction of the through hole 330 is the same as the length direction of the guide shaft 4. The steel rope passes through the through hole 330, and the steel rope cooperates with a connection mechanism such as a pulley to realize the connection between the steel rope and the heald frame, so that the movement of the guide block 33 drives the movement of the heald frame, eliminating the need for a dobby machine, a heald lifting mechanism, etc., with a simple structure and convenient maintenance.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A linear motor, characterized in that: The invention comprises a motor frame, a plurality of guide shafts fixed on both sides of the motor frame, a plurality of stator plates arranged in sequence in the motor frame, and a mover plate sandwiched between adjacent stator plates, wherein the stator plate comprises a plurality of magnets distributed in an array, the mover plate comprises a plate body, a plurality of coils fixed on the plate body and acting with the magnets to generate a magnetic field, and guide blocks fixed on both sides of the plate body, the guide shafts are passed through the guide blocks and are slidably connected to the guide blocks, and by arranging guide blocks on both sides of the plate body and fixing guide shafts on both sides of the motor frame, the volume occupied by the guide device is small, and the use of The space on both sides of the mover plate and in the motor frame reduces the volume of the linear motor; the motor frame includes an upper frame, a lower frame and two side plates arranged between the upper frame and the lower frame, the two ends of the guide shaft are respectively fixed to the upper frame and the lower frame, a guide shaft pressure plate is also fixed on the upper frame, the guide shaft extends into the upper frame, the upper frame is correspondingly provided with a mounting hole for installing the guide shaft pressure plate, one end of the guide shaft is provided with a notch, and the lower end of the guide shaft extends into the lower frame, the side wall of the lower frame is also provided with a fastening hole, and a steel ball screw abutting against the side wall of the notch is provided in the fastening hole.

2. The linear motor according to claim 1, characterized in that: The stator plate further comprises a magnet frame having a plurality of square slots and cover plates fixed on both sides of the magnet frame. The magnets are arranged in the square slots in a one-to-one correspondence, and each magnet is sandwiched between two cover plates.

3. The linear motor according to claim 1, characterized in that: The magnets are distributed in a two-dimensional array. In each column of the magnets, the magnetic poles of adjacent magnets facing the same mover plate are opposite.

4. The linear motor according to claim 3, characterized in that: The plate body is provided with a plurality of coil slots, the coil slots are distributed in a two-dimensional array, and the coils are arranged in the coil slots in a one-to-one correspondence.

5. The linear motor according to claim 1, characterized in that: A ball linear bearing is provided between the guide block and the guide shaft.

6. The linear motor according to claim 1, characterized in that: Buffer pads are sleeved on both ends of the guide shaft.

7. The linear motor according to claim 1, characterized in that: The inner wall of the upper frame and the inner wall of the lower frame are both provided with positioning grooves for inserting the stator plate.

8. The linear motor according to claim 1, characterized in that: A pressure strip for pressing the stator plate is fixed to the upper frame, and the length direction of the pressure strip is the same as the thickness direction of the stator plate.

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