CN218829568U

CN218829568U - Linear motor capable of offsetting magnetic attraction force and electric equipment comprising linear motor

Info

Publication number: CN218829568U
Application number: CN202223459278.4U
Authority: CN
Inventors: 张胜龄
Original assignee: Apas Cnc Machine Tool Manufacturing Shanghai Co ltd
Current assignee: Apas Cnc Machine Tool Manufacturing Shanghai Co ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-04-07
Anticipated expiration: 2032-12-21

Abstract

The utility model provides a linear motor capable of offsetting magnetic attraction, which comprises at least one first linear motor component, at least one second linear motor component, a workbench and a base, wherein two sides of the workbench are respectively connected on the base in a sliding way through at least one group of slide rail modules; the first linear motor assembly and the second linear motor assembly are sleeved with each other, and the second linear motor assembly moves relative to the first linear motor assembly when the linear motor operates. The utility model discloses can accommodate motor in the same volume more, thrust is bigger, and the loss rate is higher, reaches the equilibrium at the central point because of the magnetic attraction of each group's motor, and the moment of flexure causes the deformation to reduce by a wide margin to stabilize the air gap size, the output force is more stable.

Description

Linear motor capable of offsetting magnetic attraction force and electric equipment comprising linear motor

Technical Field

The utility model relates to a linear electric motor field, in particular to can offset linear electric motor of magnetic attraction and including its consumer.

Background

With the continuous development of high-speed and ultrahigh-speed machining, the linear motor is more and more widely applied to various machine tools and machining centers, and compared with the traditional ball screw system, the linear motor system has the advantages of no intermediate link, high precision, high speed and acceleration and the like.

The linear motor servo feeding system has a series of advantages of simple structure, fast dynamic response, high speed and acceleration, high positioning precision, unlimited stroke length, small vibration and noise and the like, so the linear motor servo feeding system has wide application prospect on a machine tool. But at the same time the linear motor itself has some problems that are not solved well.

The linear motor driving system mainly comprises a magnet for driving, a motor coil (a rotor or a stator), a grating ruler reading head for accurate positioning and the like. When the linear motor is applied to a machine tool, the stator is fixed on the machine tool, the rotor is connected with the workbench and supported by the linear guide rail, and a certain air gap is kept between the surface of the rotor and the stator. After the winding is electrified, tangential electromagnetic thrust is generated between the rotor and the stator, the rotor drives the workbench to do linear motion under the support of the linear guide rail and the guide of the sliding block, the stator is made of a permanent magnetic material, and normal magnetic attraction force can be generated no matter whether the winding is electrified or not. A normal magnetic attraction force perpendicular to the feed motion direction has a value of about 10 times the thrust force for the single-sided linear motor. The normal magnetic attraction force can cause assembly difficulty and generate additional frictional resistance, so that the thrust fluctuation is caused, and the accuracy of moving parts of the machining center is influenced.

The existing linear motor is mainly arranged in a single-side mode and an opposite-side distributed mode, the single-side mode comprises a group of linear motor stators and linear motor rotors, and the opposite-side distributed mode comprises two groups of linear motor stators and linear motor rotors which are distributed in an opposite direction. The magnetic attraction between the stator and the rotor completely exists, and a device for keeping the position of the rotor and the stator of the unilateral motor bears a large load. The symmetric distribution can balance the magnetic attraction between most of the stators, and the deformation of a bending moment exists, namely the air gap between the near end and the far end is inconsistent. The double-side linear motor used on the machine tool puts higher requirements on the structural rigidity of the machine tool, so when the machine tool is designed, in order to ensure stable thrust, the layout of the linear motor is made into a symmetrical structure as much as possible, and the smaller the influence of the normal magnetic attraction is, the better the influence is.

In view of the above, the present inventors have devised a linear motor capable of canceling a magnetic attraction force and an electric device including the same.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to have higher requirement to lathe structural rigidity in order to overcome among the prior art linear electric motor, need bear defects such as great load, provide a linear electric motor that can offset magnetic attraction and reach consumer including it.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

a linear motor capable of offsetting magnetic attraction is characterized by comprising at least one first linear motor assembly, at least one second linear motor assembly, a workbench and a base, wherein two sides of the workbench are respectively connected to the base in a sliding mode through at least one group of sliding rail modules;

the first linear motor assembly and the second linear motor assembly are sleeved with each other, and the second linear motor assembly moves relative to the first linear motor assembly when the linear motor operates.

According to an embodiment of the present invention, the first linear motor assembly is a linear motor stator, and the second linear motor assembly is a linear motor mover;

or the first linear motor assembly is a linear motor rotor, and the second linear motor assembly is a linear motor stator.

According to an embodiment of the present invention, the linear motor rotor includes a rotor mounting bracket and a plurality of motor coils, the rotor mounting bracket is mounted at the bottom of the worktable, and the motor coils are mounted on the rotor mounting bracket in a central symmetry manner;

the linear motor stator comprises a stator mounting bracket and a plurality of magnets, the stator mounting bracket is arranged in a groove of the base, and the magnets are arranged on the stator mounting bracket in a central symmetry manner; the motor coil is arranged opposite to the magnet.

According to the utility model discloses an embodiment, the active cell installing support is the support frame structure, the stator installing support is frame-shaped supporting structure, the active cell installing support wears to overlap in the stator installing support.

According to an embodiment of the present invention, the linear motor rotor includes a rotor mounting bracket and a plurality of motor coils, the rotor mounting bracket is disposed in the groove of the base, and the motor coils are installed on the rotor mounting bracket in a central symmetry manner;

the linear motor stator comprises a stator mounting bracket and a plurality of magnets, the stator mounting bracket is mounted at the bottom of the workbench, and the magnets are mounted on the stator mounting bracket in a centrosymmetric manner; the motor coil is arranged opposite to the magnet.

According to the utility model discloses an embodiment, the active cell installing support is frame-shaped supporting structure, the stator installing support is the support frame structure, the stator installing support wears to overlap in the active cell installing support.

According to the utility model discloses an embodiment, each group the slide rail module includes at least a set of guide rail and at least a set of slider, the slider is installed the bottom both sides of workstation, the guide rail is installed the upper end both sides of base, just the slider with guide rail relative slip sets up.

According to the utility model discloses an embodiment, motor coil inlays to be established in each inner wall face of active cell installing support.

According to an embodiment of the utility model, the active cell installing support with the stator installing support is regular polygon.

According to an embodiment of the present invention, the linear motor further comprises a measuring device, the measuring device is mounted on the base for measuring a movement position of the linear motor mover;

the motion center of the slide rail module, the measurement center of the measurement device and the thrust center of the linear motor are positioned on the same straight line.

The utility model also provides an electric equipment, its characteristics lie in, electric equipment includes as above the linear electric motor that can offset magnetic attraction.

The utility model discloses an actively advance the effect and lie in:

the utility model discloses can offset linear electric motor of magnetic attraction and including its consumer, can hold motor quantity more in the same volume, thrust is bigger, and the loss rate is higher, reaches the balance at the central point because of the magnetic attraction of each group's motor, and the moment of flexure causes the deformation to reduce by a wide margin to stabilize the air gap size, the output power is more stable, and the enclosed construction can remain stable for a long time in high frequency work, reduces the structure creep, improves the control bandwidth.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which like reference numerals refer to like features throughout, and in which:

fig. 1 is a perspective view of a first embodiment of the linear electric motor capable of offsetting magnetic attraction.

Fig. 2 is a front view of the first embodiment of the linear electric motor of the present invention capable of offsetting the magnetic attraction.

Fig. 3 is a perspective view of the second embodiment of the linear electric motor of the present invention capable of offsetting the magnetic attraction.

Fig. 4 is a front view of the second embodiment of the linear electric motor of the present invention capable of offsetting the magnetic attraction.

Fig. 5 is the utility model discloses can offset the structure schematic diagram that the central three group's linear electric motor central symmetry formula of motor coil center distributes in the linear electric motor's of magnetic attraction embodiment three.

Fig. 6 is the utility model discloses can offset the structure schematic diagram that the centralized three group's linear electric motor central symmetry formula of magnet center distributes in the linear electric motor's of magnetic attraction embodiment three.

Fig. 7 is the utility model discloses can offset the structure schematic diagram that magnetic attraction's linear electric motor's embodiment three in the centralized five groups of linear electric motor centrosymmetric distributions in motor coil center.

Fig. 8 is the utility model discloses can offset the structure schematic diagram that the centralized five groups of linear electric motor centrosymmetric distributions in the linear electric motor's of magnetic attraction embodiment three.

Fig. 9 is the utility model discloses can offset the structure schematic diagram that magnetic attraction's linear electric motor's embodiment three in the centralized six group linear electric motor centrosymmetric distributions in motor coil center.

Fig. 10 is the structural schematic diagram of the centralized six groups of linear electric motor centrosymmetric distributions in magnet center in the third embodiment of the linear electric motor that can counteract magnetic attraction.

Fig. 11 is the utility model discloses can offset the structure schematic diagram that magnetic attraction's linear electric motor's embodiment three in eight groups of linear electric motor central symmetry formulas of motor coil central authorities distribute.

Fig. 12 is the utility model discloses can offset the structure sketch map that the centralized eight group of linear electric motor centrosymmetric distributions in magnet center in the linear electric motor's of magnetic attraction's embodiment three.

Fig. 13 is the mounting structure diagram of another octagon of linear electric motor in the third embodiment of the linear electric motor that can counteract magnetic attraction.

Fig. 14 is a schematic diagram of the first to third embodiments of the linear motor according to the present invention capable of offsetting the magnetic attraction.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

Further, although the terms used in the present invention are selected from publicly known and used terms, some of the terms mentioned in the description of the present invention may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein.

Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meaning of each term lying within.

The first embodiment is as follows:

as shown in fig. 1 and 2, the utility model discloses a can offset linear electric motor of magnetic attraction, it includes at least one first linear electric motor subassembly 10, at least one second linear electric motor subassembly 20, workstation 30 and base 40. The both sides of workstation 30 are respectively through at least a set of slide rail module sliding connection on base 40, have recess 41 in base 40. The first linear motor assembly 10 is disposed in the groove 41, and the second linear motor assembly 20 is installed at the bottom of the table 30. The first linear motor assembly 10 and the second linear motor assembly 20 are sleeved with each other, and the second linear motor assembly 20 moves relative to the first linear motor assembly 10 when the linear motor operates.

In this embodiment, the first linear motor assembly 10 may be preferably a linear motor stator, and the second linear motor assembly 20 may be preferably a linear motor mover.

It is further preferable that the linear motor mover (i.e., the second linear motor assembly 20) includes a mover mounting bracket a1 and a plurality of motor coils b1, the mover mounting bracket a1 is mounted at the bottom of the table 30, and the motor coils b1 are centrally symmetrically mounted on the mover mounting bracket a 1. The linear motor stator (i.e., the first linear motor assembly 10) includes a stator mounting bracket a2 and a plurality of magnets b2, the stator mounting bracket a2 is disposed in the recess 41 of the base 40, and the magnets b2 are installed on the stator mounting bracket 11 in a center-symmetric manner. The motor coil b1 is arranged opposite to the magnet b 2.

Alternatively, in the present embodiment, the first linear motor assembly 10 may be a linear motor mover, and the second linear motor assembly 20 may be a linear motor stator (not shown).

It is further preferable that the linear motor mover (i.e., the first linear motor assembly 10) includes a mover mounting bracket a1 and a plurality of motor coils b1, the mover mounting bracket a1 is disposed in the groove 41 of the base 40, and the motor coils b1 are centrally symmetrically mounted on the mover mounting bracket a 1. The linear motor stator (i.e., the second linear motor assembly 20) includes a stator mounting bracket a2 and a plurality of magnets b2, the stator mounting bracket a2 is mounted at the bottom of the table 30, and the magnets b2 are centrally symmetrically mounted on the stator mounting bracket a 2. The motor coil b1 is arranged opposite to the magnet b 2.

In this embodiment, the mover mounting bracket a1 may preferably be a support frame structure, the stator mounting bracket a2 may preferably be a frame-shaped bracket structure, and the mover mounting bracket a1 is inserted into the stator mounting bracket a 2. The mover mounting bracket a1 and the stator mounting bracket a2 may preferably be regular polygons, and may be triangular, pentagonal, hexagonal or octagonal, for example. The linear motor in this case has a structure in which the center of the motor coil is concentrated.

For example, as shown in fig. 1 and 2, the present embodiment is exemplified by a three-group linear motor centrosymmetric distribution in which the centers of the motor coils are concentrated, and the three-group linear motor centrosymmetric distribution is realized by installing a triangular magnet support frame (i.e., the stator mounting bracket 11) and a triangular motor support frame (i.e., the mover mounting bracket 21) in the linear motor, locking the stator mounting bracket a2 with the base 40, and locking the mover mounting bracket a1 with the table 30. When the linear motor works, the rotor drives the workbench 30 to move.

Furthermore, the utility model discloses can offset linear electric motor of magnetic attraction can also include measuring device 50, and measuring device 50 can be installed on base 40 for measure linear electric motor active cell's motion position. The motion center of the slide rail module, the measurement center of the measurement device 50 and the thrust center of the linear motor are located on the same straight line.

The measuring device 50 may here preferably be a grating ruler. For example, the grating ruler is fixed on the base 40, and the reading head 31 moves linearly along the grating ruler (i.e. the measuring device 50) through the reading head bracket 32 under the driving of the workbench 30.

Preferably, each set of the slide rail modules includes at least one set of guide rails 60 and at least one set of sliding blocks 70, the sliding blocks 70 are installed at two sides of the bottom of the working platform 30, the guide rails 60 are installed at two sides of the upper end of the base 40, and the sliding blocks 70 and the guide rails 60 are arranged in a relatively sliding manner.

Example two:

as shown in fig. 3 and 4, the structure of the present embodiment is substantially the same as that of the first embodiment, and the difference is: in this embodiment, the mover mounting bracket a1 may preferably have a frame-shaped bracket structure, and the stator mounting bracket a2 may preferably have a support frame structure, and the stator mounting bracket a2 is inserted into the mover mounting bracket a 1. The mover mounting bracket a1 and the stator mounting bracket a2 may preferably be regular polygons, and may be triangular, pentagonal, hexagonal or octagonal, for example.

For example, as shown in fig. 3 and 4, the present embodiment is exemplified by a center-symmetrical distribution of three sets of linear motors with centralized motor coil centers, which is realized by installing a triangular magnet supporting frame (i.e., a stator mounting bracket a 2) and a triangular motor supporting frame (i.e., a mover mounting bracket a 1) in the linear motors, locking the stator mounting bracket a2 with the base 40, and locking the mover mounting bracket a1 with the table 30. When the linear motor works, the rotor drives the workbench 30 to move.

Example three:

the structure of the present embodiment is substantially the same as that of the first embodiment, and the difference is: the mover mounting bracket a1 and the stator mounting bracket a2 may preferably have various polygonal structures. In practical application, the magnets can be assembled into different lengths in a parallel splicing mode so as to ensure that the coupling between the magnets and the motor coil is kept unchanged in a required stroke range.

According to different configuration modes of a motor coil and a magnet, two different assembling structures are respectively designed for the triangular mounting structure, the pentagonal mounting structure, the hexagonal mounting structure and the octagonal mounting structure. The two assembling structures are mainly two embodiments formed by interchanging the positions of the motor coil and the magnet.

Of course, other structures than the two different assembly structures illustrated in the present embodiment are also within the scope of the present application, as long as the principle structures are similar and the obtained functions are consistent.

As shown in fig. 5, a mounting structure in which three groups of linear motors with centralized motor coil centers are distributed in a central symmetry manner is adopted, the motor coils b1 are installed on the outer wall surface of the mover mounting bracket a1 in a central symmetry manner, the magnets b2 are installed on the inner wall surface of the stator mounting bracket a2 in a central symmetry manner, and the motor coils b1 and the magnets b2 are arranged in a one-to-one opposite manner.

As shown in fig. 6, a mounting structure in which three groups of linear motors with centralized magnet centers are distributed in a central symmetry manner is adopted, the motor coils b1 are embedded in the inner wall surface of the mover mounting bracket a1 in a central symmetry manner, the magnets b2 are installed on the outer wall surface of the stator mounting bracket a2 in a central symmetry manner, and the motor coils b1 and the magnets b2 are arranged in a one-to-one opposite manner.

As shown in fig. 7, a mounting structure in which five groups of linear motors with centralized motor coil centers are distributed in a central symmetry manner is adopted, the motor coils b1 are installed on the outer wall surface of the mover mounting bracket a1 in a central symmetry manner, the magnets b2 are installed on the inner wall surface of the stator mounting bracket a2 in a central symmetry manner, and the motor coils b1 and the magnets b2 are arranged in a one-to-one opposite manner.

As shown in fig. 8, a mounting structure in which five groups of linear motors with centralized magnet centers are distributed in a central symmetry manner is adopted, the motor coils b1 are embedded in the inner wall surface of the mover mounting bracket a1 in a central symmetry manner, the magnets b2 are installed on the outer wall surface of the stator mounting bracket a2 in a central symmetry manner, and the motor coils b1 and the magnets b2 are arranged in a one-to-one opposite manner.

As shown in fig. 9, a mounting structure in which six groups of linear motors with centralized motor coil centers are distributed in a central symmetry manner is adopted, the motor coils b1 are installed on the outer wall surface of the mover mounting bracket a1 in a central symmetry manner, the magnets b2 are installed on the inner wall surface of the stator mounting bracket a2 in a central symmetry manner, and the motor coils b1 and the magnets b2 are arranged in a one-to-one manner.

As shown in fig. 10, a mounting structure in which six groups of linear motors with centralized magnet centers are distributed in a central symmetry manner is adopted, the motor coils b1 are embedded in the inner wall surface of the mover mounting bracket a1 in a central symmetry manner, the magnets b2 are installed on the outer wall surface of the stator mounting bracket a2 in a central symmetry manner, and the motor coils b1 and the magnets b2 are arranged in a one-to-one opposite manner.

As shown in fig. 11, an installation structure in which eight groups of linear motors with centralized motor coil centers are distributed in a central symmetry manner is adopted, the motor coils b1 are installed on the outer wall surface of the mover installation support a1 in a central symmetry manner, the magnets b2 are installed on the inner wall surface of the stator installation support a2 in a central symmetry manner, and the motor coils b1 and the magnets b2 are arranged in a one-to-one manner.

As shown in fig. 12, an installation structure in which eight groups of linear motors with centralized magnet centers are distributed in a central symmetry manner is adopted, the motor coils b1 are installed in the inner wall surface of the mover installation support a1 in a central symmetry manner, the magnets b2 are installed in the outer wall surface of the stator installation support a2 in a central symmetry manner, and the motor coils b1 and the magnets b2 are arranged in a one-to-one manner.

As shown in fig. 13, with the mounting structure in which eight groups of linear motors with staggered motor coils and magnets are distributed in a central symmetry manner, the motor coils b1 and the magnets b2 are respectively mounted on the inner wall surface of the frame-shaped support structure (i.e., the mover mounting support a 1) and the outer wall surface of the support frame structure (i.e., the stator mounting support a 2) in a staggered manner at intervals, and the motor coils b1 and the magnets b2 are arranged in a one-to-one manner.

As described in the first embodiment to the third embodiment, the utility model provides a pair of linear electric motor that can offset magnetic attraction, including at least three group's linear electric motor stators and linear electric motor active cell. As shown in fig. 14, each group of linear motor stators and linear motor movers are distributed around a central point a, and the magnetic attraction forces of each group of linear motor stators and linear motor movers are respectively F1, F2, and F3 offset at the central point a (a stress balance state is achieved).

The counteractable magnetic attraction linear motor utilizes a force balance principle to distribute at least three groups of linear motor assemblies around a central point, and the magnetic attraction of each group of linear motor stators and linear motor rotors is counteracted at the central point. The design of a novel linear motor mounting structure is carried out by combining common mechanical structures which reach balance and delicate equilibrium in nature, taking regular pentagons in golden section proportion and regular hexagons in honeycomb structure as examples, and the regular pentagons are often applied to regular octagon structures in large span structures.

The linear motor capable of offsetting the magnetic attraction force in the structure can accommodate more motors in the same volume, the thrust is larger, and the loss tolerance rate is higher.

The magnetic attraction of each group of motors is balanced at the central point, the deformation is greatly reduced due to the bending moment, so that the air gap size is stabilized, the output force is more stable, the closed structure can be kept stable for a long time in high-frequency work, the structural creep is reduced, and the control bandwidth is improved.

To sum up, the utility model discloses can offset linear electric motor of magnetic attraction and including its consumer, compare with prior art, it has following a great deal of beneficial effect:

1. the motor can be arranged for counteracting the magnetic attraction force;

2. the manufacturing cost of the base can be reduced;

3. the mounting difficulty of the locking mechanism at the bottom of the bracket can be reduced;

4. the rigidity of the base can be increased;

5. the three-core one-line or four-core one-line can be kept, and the adaptability of the motor and the mechanical structure is optimal.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are all within the scope of the invention.

Claims

1. The linear motor capable of offsetting the magnetic attraction is characterized by comprising at least one first linear motor assembly, at least one second linear motor assembly, a workbench and a base, wherein two sides of the workbench are respectively connected to the base in a sliding mode through at least one group of sliding rail modules;

2. The linear motor capable of counteracting magnetic attraction of claim 1 wherein said first linear motor assembly is a linear motor stator and said second linear motor assembly is a linear motor mover;

3. The linear motor capable of canceling a magnetic attractive force according to claim 2, wherein the linear motor mover includes a mover mounting bracket and a plurality of motor coils, the mover mounting bracket is mounted at a bottom of the table, and the motor coils are centrally symmetrically mounted on the mover mounting bracket;

the linear motor stator comprises a stator mounting bracket and a plurality of magnets, the stator mounting bracket is arranged in a groove of the base, and the magnets are arranged on the stator mounting bracket in a centrosymmetric manner; the motor coil is arranged opposite to the magnet.

4. The linear motor of claim 3, wherein the rotor mounting bracket is a supporting frame structure, the stator mounting bracket is a frame-shaped bracket structure, and the rotor mounting bracket is sleeved in the stator mounting bracket.

5. The linear motor capable of canceling a magnetic attraction as claimed in claim 2, wherein said linear motor mover includes a mover mounting bracket and a plurality of motor coils, said mover mounting bracket being disposed in a recess of said base, said motor coils being centrally symmetrically mounted on said mover mounting bracket;

6. The linear motor of claim 5, wherein the rotor mounting bracket is a frame bracket structure, the stator mounting bracket is a supporting frame structure, and the stator mounting bracket is inserted into the rotor mounting bracket.

7. The linear motor capable of counteracting the magnetic attraction of claim 1, wherein each set of the slide rail modules comprises at least one set of guide rails and at least one set of slide blocks, the slide blocks are installed on two sides of the bottom of the worktable, the guide rails are installed on two sides of the upper end of the base, and the slide blocks are slidably disposed relative to the guide rails.

8. The linear motor capable of canceling a magnetic attractive force according to claim 3 or 5, wherein the motor coil is embedded in each inner wall surface of the mover mounting bracket.

9. The linear motor of claim 3 or 5, wherein the mover mounting bracket and the stator mounting bracket are regular polygons.

10. The linear motor of claim 1, further comprising a measuring device mounted on the base for measuring a movement position of the linear motor mover;

11. An electric consumer, characterized in that the electric consumer comprises a linear motor according to any one of claims 1-10, which counteracts magnetic attraction.