WO2020073837A1

WO2020073837A1 - Long stroke linear motor

Info

Publication number: WO2020073837A1
Application number: PCT/CN2019/108804
Authority: WO
Inventors: 刘元江; 孙颖; 严雷
Original assignee: 歌尔股份有限公司
Priority date: 2018-10-09
Filing date: 2019-09-28
Publication date: 2020-04-16
Also published as: CN109217618B; CN109217618A

Abstract

A long stroke linear motor, comprising a plurality of stator units spliced together. The stator unit comprises a base (12), mounting strips (17), a magnetic assembly, a guide rail mounting base (18), and a guide rail body (21); a plurality of mounting strips (17) are provided on the base (12) side by side and spaced apart from each other; the guide rail mounting base (18) and the magnetic assembly are provided on the plurality of mounting strips (17); the guide rail body (21) is provided on the guide rail mounting base (18); at least two of the base (12) of the stator unit, the magnetic assembly, the guide rail mounting base (18), and the guide rail body (21) are offset at a first end (25) and offset at a second end (26) in a manner complementary to the first end (25), wherein the first end (25) of one stator unit is spliced with the second end (26) of the other stator unit.

Description

Long stroke linear motor

Technical field

The present invention relates to the technical field of linear motors, and more particularly, to a long-stroke linear motor.

Background technique

At present, most automated production lines use flat belt transmission solutions to achieve long-distance transmission of processed parts. But the flat belt transmission is driven by the motor. The intermediate connection mechanism of the flat belt is too complicated to meet the performance requirements of high efficiency, fast response, and high positioning accuracy.

Linear motors are widely used. However, the formation of existing linear motors is very short. In the automated production line, due to the many processes, the short-stroke linear motor cannot meet the requirements.

Therefore, it is necessary to provide a new technical solution to solve the above technical problems.

Summary of the invention

An object of the present invention is to provide a new technology solution for a long-stroke linear motor.

According to the first aspect of the present invention, a long-stroke linear motor is provided. The linear motor includes a plurality of stator units that are spliced together. The stator unit includes a base, a mounting bar, a magnetic assembly, a guide rail mounting seat, and a guide rail body. The guide rail mounting seat and the magnetic assembly are provided on the plurality of mounting bars, the guide rail body is provided on the guide rail mounting seat, and one end of the stator unit in the sliding direction is the first end, The other end is a second end. At least two of the base, the magnetic assembly, the guide rail mounting seat, and the guide rail body of the stator unit are misaligned at the first end, and at the second end The first ends are arranged in a complementary manner staggered, wherein the first end of one of the stator units is spliced together with the second end of the other of the stator units.

Optionally, it includes a yoke and two of the guide rail mounting seats extending in the sliding direction. The yoke is disposed on the plurality of mounting bars and is located between the two guide rail mounting seats. The first end of the rail mounting seat is flush, and the second end is flush.

Optionally, a first mounting surface is provided on the upper surface of the rail mounting base, and the rail body is fixed on the first mounting surface; it also includes a magnetic scale, and a side surface of the rail mounting base is provided with On the second mounting surface, the magnetic scale is mounted on the second mounting surface.

Optionally, including two said bases arranged parallel to the sliding direction, one end of each mounting bar is fixed on one of the bases, and the other end is fixed on the other of the bases; A first mounting groove parallel to the sliding direction is provided on the upper surface, a stop portion is provided at the opening of the first mounting groove, a first fastener is provided in the first mounting groove, and the stop portion is opposite The first fastener forms a stop, and in an unfastened state, the first fastener can slide along the first mounting groove, and a second fastener is provided on the base mounting bar, The second fastener is connected to the first fastener.

Optionally, it further includes a reinforcing rib, and the side surface of the base is provided with a second mounting groove parallel to the sliding direction, and the reinforcing rib is respectively inserted into the second mounting grooves of the two bases spliced together Inside.

Optionally, the adjacent rail mounting seats are fixedly connected by a connecting plate.

Optionally, the first end of the guide rail mounting base protrudes from the first end of the base, the first end of the magnetic circuit assembly is retracted from the first end of the base, the first end of the guide rail body One end is retracted to the first end of the guide rail mounting seat.

Optionally, a mounting bar is suspended below the first end of the guide rail mounting base, and a mounting position is provided at the second end of the base, the mounting position is used to install another stator unit suspended Set the installation bar.

According to another aspect of the present disclosure, a long-stroke linear motor is provided. The linear motor includes a plurality of stator units spliced together. The stator unit includes a base, a mounting bar, a magnetic component, a guide rail mounting seat, and a guide rail body. The multiple mounting bars are arranged side by side and spaced apart from each other on the base The guide rail mounting seat and the magnetic assembly are provided on the plurality of mounting bars, the guide rail body is provided on the guide rail mounting seat, one end of the stator unit along the sliding direction is the first end, and the other end is At the second end, the plurality of stator units include a first stator unit and a second stator unit, wherein the base of the first stator unit, the magnetic assembly, the guide rail mounting seat, and the guide rail body At least two of them are arranged at a misalignment at the first end, and at least two of the base, the magnetic assembly, the guide rail mounting seat, and the guide rail body of the second stator unit are at the second end The first end of the first stator unit is offset in a complementary manner, and the first end of the first stator unit is spliced together with the second end of the second stator unit.

Optionally, after the assembly of the stator unit is completed, the base, the mounting bar, the guide rail mounting seat, and the guide rail body are processed to a set size.

According to an embodiment of the present disclosure, the linear motor has a strong structure and high positioning accuracy.

Other features and advantages of the present invention will become clear through the following detailed description of exemplary embodiments of the present invention with reference to the drawings.

BRIEF DESCRIPTION

The drawings incorporated in and forming a part of the specification illustrate embodiments of the invention, and together with the description thereof, serve to explain the principles of the invention.

FIG. 1 is a schematic structural diagram of a long-stroke linear motor according to an embodiment of the present disclosure.

2 is an assembly diagram of a long-stroke linear motor according to an embodiment of the present disclosure.

FIG. 3 is a partially enlarged view of FIG. 2.

4 is a front view of a stator unit according to an embodiment of the present disclosure.

Description of reference signs:

12: base; 12a: bottom of the base; 13: first mounting groove; 14: second mounting groove; 15: stopper; 16: T-nut; 17: mounting bar; 17a: yoke mounting surface; 18: guide rail Mounting base; 19: first mounting surface; 19a: positioning side rail; 21: rail body; 22: connecting plate; 23: yoke; 24: rib; 25: first end; 26: second end; 27: Magnetic scale; 27a: second mounting surface.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is actually merely illustrative, and in no way serves as any limitation on the invention and its application or use.

Techniques, methods and equipment known to those of ordinary skill in the related art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the description.

In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiment may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, therefore, once an item is defined in one drawing, there is no need to discuss it further in subsequent drawings.

According to an embodiment of the present disclosure, a long-stroke linear motor is provided. The linear motor includes a plurality of stator units spliced together. Each stator unit includes a base 12, a mounting bar 17, a magnetic assembly, a rail mounting seat 18, and a rail body 21. Magnetic components are used to form magnetic or electromagnetic fields. For example, the magnetic component is a yoke 23. The yoke 23 includes a magnetic conductive plate and a plurality of permanent magnets arranged side by side in the sliding direction. Multiple permanent magnets are fixed on the magnetic conducting plate. The yoke 23 forms a magnetic field. The stator of the linear motor includes a slider and a coil group fixed on the slider. The coil group cooperates with the yoke 23 and is located in the magnetic field of the yoke 23.

Alternatively, the magnetic circuit assembly may include coil sets arranged side by side along the sliding direction. The stator assembly includes a slider and a permanent magnet provided on the slider. The permanent magnet cooperates with the coil group, and the corresponding coil is located in the magnetic field of the permanent magnet. The sliding direction refers to the direction when the mover assembly slides, as shown in C in FIG. 2.

As shown in FIGS. 1-2, a plurality of mounting bars 17 are provided on the base 12 side by side and spaced apart from each other. The rail mounting base 18 and the magnetic assembly are provided on a plurality of mounting bars 17. The mounting bar 17 is used to support the rail mounting base 18. The rail body 21 is provided on the rail mount 18.

For example, the base 12, the guide rail mounting seat 18, and the guide rail body 21 all have a linear structure and are parallel to the sliding direction. The mounting bar 17 has a bar structure. The long side of the mounting bar 17 is perpendicular to the sliding direction to facilitate installation and positioning. Multiple mounting bars 17 are arranged at equal intervals. Of course, the mounting bar 17 may have other angles with respect to the sliding direction. The mounting bar 17, the rail mounting seat 18, and the rail body 21 are respectively fixed by bolting, snapping, riveting, etc. The guide rail body 21 is used to support the mover assembly so that the yoke 23 is spaced from the coil group.

A first mounting surface 19 is provided on the upper surface of the rail mounting base 18. The rail body 21 is fixed on the first mounting surface 19. The first mounting surface 19 is also provided with a guide rail positioning side surface 19a. The guide rail positioning side surface 19a is used to position the guide rail so that the guide rail body 21 can be parallel to the sliding direction.

A second mounting surface 27a is provided on the side surface of the rail mount 18. The magnetic scale 27 is mounted on the second mounting surface 27a. The magnetic scale 27 cooperates with the reading head of the mover assembly to position the mover assembly.

As shown in FIG. 2, one end of the meter stator unit in the sliding direction is the first end 25 and the other end is the second end 26. At least two of the base 12 of the stator unit, the magnetic assembly, the rail mount 18, and the rail body 21 are misaligned at the first end 25 and misaligned at the second end 26 in a manner complementary to the first end 25. The first end 25 of one of the stator units is spliced together with the second end 26 of the other stator unit, as shown in Figures 1-3.

As shown in FIG. 3, the misalignment means that at least two end surfaces of the base 12, the magnetic assembly, the rail mounting base 18, and the rail body 21 are not in the same plane, for example, the plane is perpendicular to the sliding direction. For example, based on the plane where the end face of one of the parts is located, some parts protrude out of this plane, and some parts are indented in this plane. The extending direction of the base 12, the magnetic assembly, the guide rail mounting seat 18, and the guide rail body 21 of each stator unit is parallel to the sliding direction. Complementary means that if the first end 25 of one part protrudes beyond the plane of the end face of the first end 25 of the other part, the second end 26 of the part is retracted from the second end 26 of the other part The end face of one of the parts; if the first end 25 of one part is indented in the plane of the end face of the first end 25 of the other part, the second end 26 of the part protrudes from the end face of the second end 26 of the other part To complement each other.

During installation, the bases 12 of different stator units are docked with the base 12, the rail mounting seat 18 is docked with the rail mounting seat 18, the magnetic components are docked with the magnetic components, and the rail body 21 is docked with the rail body 21. The linearity of the stator unit after docking should be guaranteed to reduce the unstable operation of the linear motor.

In the embodiments of the present disclosure, a plurality of stator units are spliced together, which effectively extends the length of the linear motor to meet the requirements for long strokes.

In addition, the base 12, the magnetic component, the guide rail mounting seat 18 and the guide rail body 21 are arranged in a misaligned manner and in a complementary manner, which can effectively improve the connection strength of the stator unit and effectively improve the positioning accuracy of the multiple stator units. Linearity remains good.

The stator unit of this long-stroke linear motor is of modular design. Those skilled in the art can set the length of the long-stroke linear motor according to actual needs.

In one example, as shown in FIGS. 1-2, the stator unit includes a yoke 23 and two guide rail mounts 18 extending in the sliding direction. The yoke 23 is provided on the plurality of mounting bars 17 and is located between the two rail mounting seats 18. For example, a yoke mounting surface 17a is provided on the central upper surface of each mounting bar 17. The yoke 23 is fixed to the yoke mounting surface 17a. The first end 25 of the two rail mounts 18 is flush, and the second end 26 is flush. The double guide rail structure can provide more balanced support for the mover assembly, making the operation of the linear motor more stable.

In addition, both ends of the two guide rail mounts 18 are flush, which makes alignment between different stator units easier.

Of course, the number of the rail body 21 may be more.

In one example, as shown in FIGS. 1-2, the stator unit includes two bases 12 arranged parallel to the sliding direction. One end of each mounting bar 17 is fixed to one of the bases 12 and the other end is fixed to the other base 12. The two bases 12 can provide a more balanced supporting force for the mounting bar 17 and the like, and make it easier to fix the stator unit to other equipment, and the level of the stator unit is higher.

The upper surface of the base 12 is provided with a first mounting groove 13 parallel to the sliding direction. A stop 15 is provided at the opening of the first mounting groove 13. For example, there are two stopper portions 15 and the first mounting groove 13 is configured to tighten the mouth. The first fastening groove 13 is provided with a first fastener. The stopper 15 forms a stop for the first fastener. In the unfastened state, the first fastener can slide along the first mounting groove 13. In this way, the user can adjust the first fastener to an appropriate position according to actual needs. A second fastener is provided on the mounting bar 17 of the base 12, and the second fastener is connected to the first fastener.

For example, as shown in FIG. 4, the first fastener is a T-shaped nut 16. The T-shaped nut 16 is pre-installed into the first mounting groove 13. The longitudinal portion of the T-nut 16 is located in the opening formed by the two stop portions 15. The second fastener is a screw. During installation, the screw is screwed into the T-nut 16 to form a tight connection. The connection of this type of connection is firm and makes the installation and removal of the mounting bar 17 very easy.

In one example, as shown in FIGS. 2-4, the stator unit further includes reinforcing ribs 24. The side surface of the base 12 is provided with a second mounting groove 14 parallel to the sliding direction. The reinforcing ribs 24 are respectively inserted into the second mounting grooves 14 of the two bases 12 spliced together. The reinforcing ribs 24 can effectively improve the connection strength between multiple stator units, and improve the installation accuracy of the long-stroke linear motor.

For example, as shown in FIG. 4, the first mounting groove 13 is located on the upper surface of the base 12. The second mounting groove 14 is located on the side surface of the base 12. The second mounting groove 14 has a similar structure to the first mounting groove 13. The cross section of the rib 24 is T-shaped. The longitudinal portion of the T shape is located between the openings formed by the two stop portions 15. The longitudinal portion is provided with threaded holes. The screw is installed in the threaded hole. The reinforcing ribs 24 are fixed to the two adjacent bases 12 by screws. This makes the position of the rib 24 more fixed, and the effect of improving the connection strength is more excellent.

In one example, as shown in FIGS. 2-3, the adjacent rail mounting bases 18 are fixedly connected by connecting plates. For example, the connecting plate 22 and two adjacent rail mounting seats 18 are fixed together by screws. This connection method has high assembly accuracy, firm connection and easy disassembly.

In one example, as shown in FIG. 3, the first end 25 of the rail mount 18 protrudes from the first end 25 of the base 12. The first end 25 of the magnetic circuit assembly is retracted from the first end 25 of the base 12. The first end 25 of the rail body 21 is retracted from the first end 25 of the rail mounting seat 18.

In this example, the guide rail mounting base 18, the magnetic circuit assembly and the guide rail body 21 are all formed in a misaligned arrangement. The three connection points are on different planes. When assembling, it needs to be positioned at three positions, which makes the positioning accuracy of the long-stroke linear motor higher.

In one example, as shown in FIG. 3, a mounting bar 17 is suspended below the first end 25 of the rail mounting base 18. An installation position is provided at the second end 26 of the base 12. The mounting position is used to install another mounting bar 17 of the stator unit suspended above the ground. In this example, the mounting bar 17 is fixed to the mounting position, which increases the connection points between adjacent stator units, further improving the connection strength.

In one example, as shown in FIGS. 3-4, after the assembly of the stator unit is completed, the base 12, the mounting bar 17, the rail mounting seat 18, and the rail body 21 are processed to a set size. For example, before assembling, each of the above-mentioned parts reserves a set machining allowance. After the assembly is completed, the stator unit is further processed by the machine tool. The method of assembling and then processing the dimensions enables the dimensions of the stator unit to be more accurate. Compared with the method of first processing into a set size and then assembling, this method can effectively reduce the errors caused by the assembly process and make the processing accuracy of the stator unit higher.

For example, as shown in FIG. 4, the surfaces to be processed include: a first mounting surface 19, a guide rail positioning side surface 19a, a magnetic grid mounting surface, a yoke mounting surface 17a, a base bottom surface 12a, and the like.

During processing, the dimensional accuracy H1 of the yoke mounting surface 17a to the base bottom surface 12a should be ensured to prevent thrust fluctuations caused by uneven air gaps of the linear motor;

Ensure the height H2 of the first mounting surface 19 and the accuracy B of the guide rail positioning side 19a to prevent poor splicing of the guide rail body 21 and affect the accuracy of the movement of the mover assembly of the linear motor;

The accuracy A of the second mounting surface 27a is ensured to prevent the position deviation caused by the splicing of the two rail mounting seats 18, which affects the flatness of the magnetic scale 27 and thus affects the accuracy of the reading head signal.

According to another embodiment of the present disclosure, as shown in FIGS. 1-3, the plurality of stator units includes a first stator unit and a second stator unit. At least two of the base 12, the magnetic assembly, the guide rail mounting seat 18, and the guide rail body 21 of the first stator unit are disposed at the first end 25 in a misaligned manner. At least two of the base 12, the rail mounting seat 18, and the rail body 21 of the second stator unit are misaligned at the second end 26 in a manner complementary to the first end 25 of the first stator unit. The first end 25 of the first stator unit is spliced together with the second end 26 of the second stator unit.

In this example, after being spliced together, the total lengths of the bases 12, the magnetic components, the guide rail mount 18, and the guide rail body 21 of the two stator units are the same. Complementary means that the first end 25 of one part of the first assembly protrudes from the end face of the first end 25 of the other part, then the second end 26 of the part of the second assembly is retracted from the other part The end face of the second end 26.

The linear motor has high installation accuracy, high structural strength, and easy disassembly and assembly.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims

A long-stroke linear motor includes a plurality of stator units that are spliced together. The stator unit includes a base, a mounting bar, a magnetic assembly, a guide rail mounting seat, and a guide rail body. On the base, the guide rail mount and the magnetic assembly are provided on the plurality of mounting bars, the guide rail body is provided on the guide rail mount, and one end of the stator unit in the sliding direction is The first end and the other end are the second end. At least two of the base, the magnetic assembly, the guide rail mounting seat, and the guide rail body of the stator unit are misaligned at the first end, and The two ends are offset in a complementary manner to the first end, wherein the first end of one of the stator units is spliced together with the second end of the other of the stator units.
The long-stroke linear motor according to claim 1, wherein it includes a yoke and two of the guide rail mounting seats extending in the sliding direction, the yoke is provided on the plurality of mounting bars and is located on the two Between the rail mounting seats, the first ends of the two rail mounting seats are flush, and the second ends are flush.
The long-stroke linear motor according to claim 1, wherein a first mounting surface is provided on the upper surface of the rail mounting base, and the rail body is fixed on the first mounting surface;

It also includes a magnetic scale, a second mounting surface is provided on the side surface of the rail mounting base, and the magnetic scale is mounted on the second mounting surface.
The long-stroke linear motor according to claim 1, comprising two said bases arranged parallel to the sliding direction, one end of each mounting bar is fixed on one of the bases, and the other end is fixed on the other One on the base; the upper surface of the base is provided with a first mounting groove parallel to the sliding direction, a stop is provided at the opening of the first mounting groove, and a first is provided in the first mounting groove A fastener, the stopper forms a stop for the first fastener, and in an unfastened state, the first fastener can slide along the first mounting groove and be installed on the base A second fastener is provided on the bar, and the second fastener is connected to the first fastener.
The long-stroke linear motor according to claim 1, further comprising a reinforcing rib, the side surface of the base is provided with a second mounting groove parallel to the sliding direction, and the reinforcing ribs are respectively inserted into two spliced with each other In the second mounting groove of the base.
The long-stroke linear motor according to any one of claims 1 to 5, wherein the adjacent rail mounting seats are fixedly connected by a connecting plate.
The long-stroke linear motor according to any one of claims 1 to 5, wherein the first end of the rail mounting base protrudes from the first end of the base, and the first end of the magnetic circuit assembly Retracted at the first end of the base, the first end of the rail body is retracted at the first end of the rail mounting base.
The long-stroke linear motor according to claim 7, wherein the mounting bar is suspended below the first end of the guide rail mounting seat, and a mounting position is provided at the second end of the base, the The mounting position is used to install another stator unit's suspended mounting bar.
A long-stroke linear motor includes a plurality of stator units spliced together. The stator unit includes a base, a mounting bar, a magnetic assembly, a guide rail mounting seat, and a guide rail body. A plurality of mounting bars are arranged side by side and spaced apart from each other On the base, the guide rail mounting seat and the magnetic assembly are provided on the plurality of mounting bars, the guide rail body is provided on the guide rail mounting seat, and one end of the stator unit in the sliding direction is the first end , The other end is the second end, the plurality of stator units includes a first stator unit and a second stator unit, wherein the base of the first stator unit, the magnetic assembly, the guide rail mounting seat and At least two of the guide rail bodies are disposed at the first end in a misaligned manner, and at least two of the base, the magnetic assembly, the guide rail mounting seat, and the guide rail body of the second stator unit are located in the second The ends are offset in a complementary manner to the first end of the first stator unit, and the first end of the first stator unit is spliced together with the second end of the second stator unit.
The long-stroke linear motor according to any one of claims 1 to 5 and 10, wherein after the assembly of the stator unit is completed, the base, the mounting bar, the rail mounting base, and the The rail body is processed to the set size.