WO2022047888A1

WO2022047888A1 - Linear motor

Info

Publication number: WO2022047888A1
Application number: PCT/CN2020/120494
Authority: WO
Inventors: 郭顺; 史卫领; 翁兆勇
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技（南京）有限公司
Priority date: 2020-09-01
Filing date: 2020-10-12
Publication date: 2022-03-10
Also published as: CN213661412U

Abstract

A linear motor (100), comprising a base (10), a sliding base (20) slidably connected to the base (10), a primary assembly (30), a secondary assembly (40), and a brush assembly (70). The primary assembly (30) and the brush assembly (70) are fixed on one of the sliding base (20) and the base (10), and the secondary assembly (40) is fixed on the other of the sliding base (20) and the base (10). The primary assembly (30) comprises at least one armature winding (32), and is used for producing a travelling wave magnetic field. The secondary assembly (40) is arranged opposite the primary assembly (30) at an interval, and the secondary assembly (40) comprises a plurality of excitation windings (42) arranged at intervals. The brush assembly (70) is used for electrically conducting the excitation windings (42) opposite the primary assembly (30) so as to produce an excitation magnetic field. The travelling wave magnetic field and the excitation magnetic field interact so as to push the sliding base (20) or the base (10) to slide along a sliding direction. Compared with the prior art, the excitation windings (42) are used instead of magnetic steel as the secondary, thereby reducing the production costs of the linear motor (100).

Description

Linear Motor

technical field

The invention relates to the technical field of drives, in particular to a linear motor.

Background technique

Linear motor is a driver that directly converts electrical energy into mechanical energy of linear motion. Compared with traditional drivers, linear motor can realize linear drive without transmission structure, with simple structure, low loss, high precision and high efficiency.

The linear motor of the related art includes a primary drive assembly and a secondary drive assembly. The primary drive assembly is generally composed of a winding structure, and the secondary drive assembly is generally composed of a magnetic yoke and a magnetic steel. When the primary drive assembly is energized, Relative linear motion is generated between the primary drive assembly and the secondary drive assembly. The length of the secondary drive assembly is proportional to the stroke of the linear drive motor, that is, the longer the stroke of the linear drive motor, the longer the length of the secondary drive assembly, thereby increasing the magnetic yoke and the length of the secondary drive assembly. The length (quantity) of the magnetic steel, and the higher cost of the yoke and the magnetic steel, increase the cost of the linear motor.

Therefore, a new linear motor must be provided to solve the above technical problems.

technical problem

An object of the present invention is to provide a linear motor with reduced cost.

technical solutions

In order to achieve the above object, the present invention provides a linear motor, which includes: a base, a sliding seat slidably connected to the base, a primary assembly, a secondary assembly and a brush assembly; the primary assembly and a brush assembly is fixed to one of the sliding seat and the base, and the secondary assembly is fixed to the other of the sliding seat and the base; the primary assembly includes at least one armature winding, for generating a traveling wave magnetic field; the secondary assembly is spaced apart from and opposite to the primary assembly, the secondary assembly includes a plurality of spaced apart excitation windings; and the brush assembly is used for electrical conduction with all The excitation winding is opposite to the primary assembly to generate an excitation magnetic field, and the traveling wave magnetic field interacts with the excitation magnetic field to push the sliding seat or the base to slide along the sliding direction. .

Preferably, the brush assembly includes a first conductive member and a second conductive member, the excitation winding includes a first outlet end and a second outlet end, and the first conductive member and the second conductive member are respectively connected with the The first outlet end and the second outlet end are electrically connected.

Preferably, the secondary assembly further includes a plurality of first conductive blocks and second conductive blocks, each first conductive block is electrically connected to the first outlet end of each of the excitation windings, and each second conductive block is connected to The second outlet ends of each of the excitation windings are electrically connected, the plurality of first conductive blocks are arranged at intervals along the sliding direction, and the plurality of second conductive blocks are arranged at intervals along the sliding direction; the first conductive blocks are arranged at intervals along the sliding direction; The conductive blocks and the second conductive blocks are arranged at intervals along a second direction perpendicular to the sliding direction.

Preferably, the secondary assembly further comprises a plurality of first insulating parts and a plurality of second insulating parts, each of the first insulating parts is connected between two adjacent first conductive blocks, each The second insulating member is connected between two adjacent second conductive blocks.

Preferably, the secondary assembly further includes a first connecting piece and a second connecting piece, the first connecting piece connects the plurality of first conductive blocks and the plurality of first insulating pieces, the second connecting piece A piece connects the plurality of second conductive blocks and the plurality of second insulating pieces; the first connecting piece and the second connecting piece are arranged in parallel and spaced apart along the sliding direction.

Preferably, the primary assembly and the brush assembly are fixed to the sliding seat, the secondary assembly is fixed to the base, and the primary assembly and the secondary assembly are perpendicular to the sliding direction. The first direction is spaced apart and opposite to each other, and the primary assembly and the brush assembly are spaced apart and opposite to each other along a second direction perpendicular to the sliding direction.

Preferably, the primary assembly and the brush assembly are fixed to the base, the secondary assembly is fixed to the sliding seat, and the primary assembly and the secondary assembly are perpendicular to the sliding direction. The first direction is spaced apart and opposite to each other, and the primary assembly and the brush assembly are spaced apart and opposite to each other along a second direction perpendicular to the sliding direction.

Preferably, the brush assembly further includes a fixing member, the fixing member includes a fixing body connected with the sliding seat, and a first fixing arm and a second fixing arm bent and extended from opposite ends of the fixing body , the first fixed arm is connected to the first conductive member, and the second fixed arm is connected to the second conductive member.

Preferably, the secondary assembly further includes a support member, the support member connects the base with the first outlet end and the second outlet end.

Preferably, the primary assembly further includes an armature iron core, the armature iron core includes a first base plate fixed on the sliding seat, and the at least one armature winding is fixed on the first base plate.

Preferably, the armature core further includes at least one first tooth portion disposed on the first substrate, and the armature winding is sleeved on the first tooth portion.

Preferably, the secondary assembly further includes an excitation core, the excitation core includes a second base plate fixed to the base, and the plurality of excitation windings are fixed to the second base plate.

Preferably, the field core further includes a plurality of second tooth portions disposed on the second substrate, and the plurality of field windings are respectively sleeved on the plurality of second tooth portions.

Preferably, the brush assembly further includes a fixing member, the fixing member includes a fixing body connected with the base, and a first fixing arm and a second fixing arm bent and extended from opposite ends of the fixing body , the first fixed arm is connected to the first conductive member, and the second fixed arm is connected to the second conductive member.

Preferably, the secondary assembly further includes a support member, the support member connects the sliding seat with the first outlet end and the second outlet end.

Preferably, the primary assembly further includes an armature iron core, the armature iron core includes a first base plate fixed on the base, and the at least one armature winding is fixed to the first base plate.

Preferably, the secondary assembly further includes an excitation core, the excitation core includes a second base plate fixed to the sliding seat, and the plurality of excitation windings are fixed to the second base plate.

Preferably, the linear motor further includes a guide rail assembly slidably connecting the base and the sliding seat.

Preferably, the base includes a first plate body, a support plate bent and extended from both sides of the first plate body, and a first mounting portion provided on one end of the support plate away from the first plate body , the sliding seat includes a second plate body and a second mounting portion arranged on both sides of the second plate body, and the guide rail assembly includes a A first guide rail and a second guide rail are slidably connected.

Preferably, the linear motor further includes a detection assembly, the detection assembly includes a scale and a scale reading head, the scale is fixed on one of the base and the sliding seat, and the scale reads A head is secured to the other of the carriage and the base, the sensing end of the scale read head facing the scale.

beneficial effect

Compared with the related art, the base and the sliding seat of the above-mentioned linear motor are driven by the armature winding and the excitation winding to move relative to each other, and the excitation winding is used to replace the magnetic steel in the prior art as the secondary component. The production cost of the above-mentioned linear motor.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort, among which.

FIG. 1 is a schematic diagram of an explosion structure of a linear motor provided by the present invention.

FIG. 2 is a schematic diagram of an exploded structure of the primary assembly shown in FIG. 1 .

FIG. 3 is a schematic diagram of an exploded structure of the secondary assembly shown in FIG. 1 .

FIG. 4 is a schematic structural diagram of the linear motor shown in FIG. 1 after being assembled.

FIG. 5 is a schematic cross-sectional structure diagram of FIG. 4 along the A-A direction.

FIG. 6 is an enlarged view of part B in FIG. 4 .

Embodiments of the present invention

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIGS. 1-5 , the linear motor 100 of the example of the present invention includes a base 10 , a sliding seat 20 , a guide rail assembly 50 for making the base 10 move relative to the sliding seat 20 in the sliding direction X, and a guide rail assembly 50 fixed on the The primary assembly 30 on the sliding seat 20, the secondary assembly 40 fixed on the base 10, the brush assembly 70 fixed on the sliding seat 20 and slidably supplying current to the secondary assembly 40, and A detection assembly 90 for detecting the relative movement of the base 10 and the sliding seat 20 . After the primary component 30 is energized, a traveling wave magnetic field is generated, and the secondary component 40 is energized to generate an excitation magnetic field, and the traveling wave magnetic field and the excitation magnetic field interact to generate thrust, thereby pushing the sliding seat 20 to slide relative to the base 10 along the sliding direction X .

The detection assembly 90 includes a scale 92 and a scale read head 91 , the scale 92 is fixed on the base 10 , the scale read head 91 is fixed on the sliding seat 20 , and the scale read head 91 is fixed to the sliding seat 20 . The sensing end faces the scale 92 . The brush assembly 70 is disposed adjacent to the primary assembly 30 and electrically conducts the secondary assembly 40 when sliding.

Specifically, the base 10 is substantially U-shaped, and includes a first plate body 11 , a support plate 12 bent and extended from both sides of the first plate body 11 , and a support plate 12 disposed on the support plate 12 away from the first plate body 11 . A first mounting portion 14 on one end of the plate body 11 .

The sliding seat 20 is generally in the shape of a plate body, and includes a second plate body 21 and a second mounting portion 22 disposed on both sides of the second plate body 21 .

The guide rail assembly 50 includes a first guide rail 51 and a second guide rail 52 respectively mounted on the first mounting portion 14 and the second mounting portion 22. The first guide rail 51 and the second guide rail 52 can be For sliding connection, during assembly, the sliding seat 20 is covered on the base 10 and is slidably connected together by the first guide rail 51 and the second guide rail 52 . The sliding seat 20 and the base 10 together form a receiving space 13 . The primary assembly 30 , the secondary assembly 40 , the brush assembly 70 and the detection assembly 90 are all accommodated in the accommodation space 13 .

The primary assembly 30 includes an armature iron core 31 and an armature winding 32 sleeved on the armature iron core 31 . The armature core 31 includes a first base plate 311 in a substantially plate shape, a first baffle plate 312 formed by bending and extending from both ends of the first base plate 311 , and two first baffle plates 312 . A plurality of first tooth portions 313 are provided between the plates 312 at intervals along the sliding direction X. A side of the first base plate 311 away from the first tooth portion 313 is connected to the second plate body 21 of the sliding seat 20 . The armature winding 32 includes an armature winding body 321 and a first through hole 322 surrounded by the armature winding body 321 , and the armature winding 32 is sleeved on the first tooth portion 313 through the first through hole 322 , or directly wound on the first tooth portion 313 through the armature winding body 321 . The number of the first teeth 313 and the armature windings 32 are the same. It can be understood that, in other embodiments, the armature iron core may not be provided, or the armature iron core may not be provided with the tooth portion.

The secondary assembly 40 is spaced apart from the primary assembly 30 along a first direction Z perpendicular to the sliding direction X to form an air gap 101 . The secondary assembly 40 includes an excitation core 41 , a plurality of excitation windings 42 arranged on the excitation core 41 , a plurality of first conductive blocks 43 and a plurality of first conductive blocks 43 electrically connected to the excitation windings 42 respectively. Two conductive blocks 44 , a first insulating member 45 connecting two adjacent first conductive blocks 43 , a second insulating member 46 connecting two adjacent second conductive blocks 44 , connecting the first A first connecting piece 47 between the conductive block 43 and the first insulating piece 45 and a second connecting piece 48 connecting the second conducting block 44 and the second insulating piece 46 . The plurality of field windings 42 are arranged at intervals along the sliding direction X. A plurality of first conductive blocks 43 are arranged at intervals along the sliding direction X, and a plurality of second conductive blocks 44 are arranged at intervals along the sliding direction X. Direction Y interval setting. The first connecting piece 47 and the second connecting piece 48 are arranged in parallel along the sliding direction X. It can be understood that, in other embodiments, the first conductive block, the second conductive block, the first insulating member, the second insulating member, the first connecting member and the second connecting member may not be provided.

The excitation core 41 includes a second base plate 411 having a substantially plate shape, a second baffle plate 412 formed by bending and extending from two ends of the second base plate 411 , and two second baffle plates 412 . A plurality of second teeth 413 between 412 . A side of the second base plate 411 away from the second tooth portion 413 is connected to the first plate body 11 , and the excitation windings 42 are respectively sleeved or wound around the second tooth portion 413 . The excitation windings 42 are provided in a one-to-one correspondence with the second tooth portions 413 .

Each excitation winding 42 includes an excitation winding body 421 , a second through hole 422 surrounded by the excitation winding body 421 , a first outlet end 423 and a second outlet end 424 extending from the excitation winding body 421 . Each of the first outlet ends 423 is electrically connected to a first conductive block 43 , and each of the second outlet ends 424 is electrically connected to a second conductive block 44 . The excitation winding 42 is sleeved on the second tooth portion 413 through the second through hole 422 , or directly wound around the second tooth portion 413 through the excitation winding body 421 . The plurality of first conductive blocks 43 are connected together by first insulating members 45 ; the plurality of second conductive blocks 44 are connected together by second insulating members 46 . The first connecting piece 47 and the second connecting piece 48 are also made of insulating material, and the first connecting piece 47 keeps the first conductive block 43 and the first insulating block 45 away from the excitation winding One side of the main body 421 is connected into one body, the second connecting member 48 connects the second conductive block 44 and the second insulating block 46 away from the side of the excitation winding body 421 into one body, and the first A connecting piece 47 and the second connecting piece 48 are spaced apart from each other.

The secondary assembly 40 also includes a support 49 . One side of the support member 49 is connected to the first board body 11 , and the other side is connected to and supports the first outlet end 423 , the second outlet end 424 and the first outlet end 423 and the second outlet end respectively. 424 the first conductive block 43 and the second conductive block 44 that are electrically connected. A side of the first conductive block 43 and the second conductive block 44 away from the support member 80 is electrically connected to the brush assembly 70 .

The brush assembly 70 includes a fixing member 71 fixedly connected with the sliding seat 20 , and a first conductive member 72 and a second conductive member 73 connected with the fixing member 71 . The fixing member 71 is substantially U-shaped, and includes a fixing body 711 and a first fixing arm 712 and a second fixing arm 713 bent and extending from two sides of the fixing body 711 , and the fixing body 711 is fixed to the fixing body 711 . The second plate body 21 is adjacent to the primary assembly 30 . The first conductive member 72 is substantially elongated and connected to the first fixed arm 711 , and the second conductive member 73 is connected to the second fixed arm 713 . During sliding, one end of the first conductive member 72 away from the first fixing arm 712 is in contact with the corresponding first conductive block 43 and is electrically connected, and the second conductive member 73 is away from the second conductive member 73 . One end of the fixed arm 712 is in contact with the corresponding second conductive block 44 and is electrically connected, so as to provide current to the excitation winding 42 .

When working, first connect the armature winding 32 of the primary assembly 30 to the power supply to generate a traveling wave magnetic field, and then connect the first conductive member 72 and the second conductive member 73 of the brush assembly 70 to the positive and negative poles of the power supply, respectively, The first outlet end 423 and the second outlet end 424 of the excitation winding 42 pass through the first conductive block 43 and the second conductive block 44 and the first conductive member 72 and the second conductive member 72 respectively. The component 73 contacts and conducts electrically, thereby generating a stable excitation magnetic field. Finally, driven by the traveling wave magnetic field and the excitation magnetic field, the sliding seat 20 passes through the first guide rail 51 and the first guide rail 51 relative to the base 10. The relative sliding of the second guide rail 52 performs linear motion.

It should be noted that the first conductive member 72 and the second conductive member 73 slide together with the sliding seat 20 and the primary assembly 30 and electrically conduct the excitation of the primary assembly 30 relative to the secondary assembly 40 winding 42, and the excitation winding 42 that is not in contact with the first conductive member 72 and the second conductive member 73 is not connected to the power supply, that is to say, only the excitation winding opposite to the primary assembly 30 42 is energized, which greatly reduces the copper consumption of the motor and improves the efficiency of the above-mentioned linear motor 100.

In other embodiments, the primary assembly 30 , the brush assembly 70 and the scale reading head 91 of the linear motor 100 can be fixed to the first plate body 11 of the base 10 , correspondingly, the secondary The assembly 40 and the scale 92 are fixed to the second plate body 21 of the sliding seat 20 . During operation, the traveling wave magnetic field generated by the primary assembly 30 and the excitation magnetic field generated by the secondary assembly 40 interact to generate thrust to push the sliding seat 20 to slide.

In other embodiments, such as fixing the sliding seat 20, the thrust force generated by the interaction of the traveling wave magnetic field and the excitation magnetic field can push the base 10 to move.

Compared with the related art, the base and the sliding seat of the above-mentioned linear motor are relatively moved by the driving of at least one armature winding and a plurality of excitation windings, the material cost of the excitation winding is low, and the production cost of the above-mentioned linear motor is reduced; The brush assembly only conducts part of the excitation winding, which greatly reduces the copper consumption of the linear motor and improves the efficiency of the linear motor.

The above are only the embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these belong to the present invention. scope of protection.

Claims

A linear motor, characterized in that the linear motor comprises:

a base, a sliding seat slidably connected to the base, a primary assembly, a secondary assembly and a brush assembly; the primary assembly and the brush assembly are fixed to one of the sliding seat and the base, and the the secondary assembly is fixed to the other of the carriage and the base;

The primary assembly includes at least one armature winding for generating a traveling wave magnetic field;

the secondary assembly is spaced apart from and opposite to the primary assembly, the secondary assembly including a plurality of spaced field windings; and

The brush assembly is used for electrically conducting the excitation winding opposite to the primary assembly to generate an excitation magnetic field, and the traveling wave magnetic field interacts with the excitation magnetic field to push the sliding seat or the base Swipe in the swipe direction.
The linear motor according to claim 1, wherein the brush assembly includes a first conductive member and a second conductive member, the excitation winding includes a first outlet end and a second outlet end, the first conductive member The component and the second conductive component are respectively electrically connected to the first outlet end and the second outlet end.
The linear motor according to claim 2, wherein the secondary assembly further comprises a plurality of first conductive blocks and second conductive blocks, each of the first conductive blocks and the first outlet of each of the excitation windings The terminals are electrically connected, each second conductive block is electrically connected to the second outlet end of each of the excitation windings, the plurality of first conductive blocks are arranged at intervals along the sliding direction, and the plurality of second conductive blocks are along the The sliding direction is spaced apart; the first conductive block and the second conductive block are spaced apart along a second direction perpendicular to the sliding direction.
The linear motor according to claim 3, wherein the secondary assembly further comprises a plurality of first insulators and a plurality of second insulators, and each of the first insulators is connected to two adjacent insulators Between the first conductive blocks, each of the second insulating members is connected between two adjacent second conductive blocks.
The linear motor according to claim 4, wherein the secondary assembly further comprises a first connecting piece and a second connecting piece, the first connecting piece connecting the plurality of first conductive blocks and the plurality of a plurality of first insulating parts, the second connecting parts connect the plurality of second conductive blocks and the plurality of second insulating parts; the first connecting parts and the second connecting parts are arranged in parallel and spaced apart along the sliding direction.
The linear motor according to any one of claims 1-5, wherein the primary assembly and the brush assembly are fixed to the sliding seat, the secondary assembly is fixed to the base, and the The primary assembly and the secondary assembly are spaced apart and opposite to each other along a first direction perpendicular to the sliding direction, and the primary assembly and the brush assembly are spaced apart and opposite to a second direction perpendicular to the sliding direction .
The linear motor according to any one of claims 1-5, wherein the primary assembly and the brush assembly are fixed on the base, the secondary assembly is fixed on the sliding seat, and the The primary assembly and the secondary assembly are spaced apart and opposite to each other along a first direction perpendicular to the sliding direction, and the primary assembly and the brush assembly are spaced apart and opposite to a second direction perpendicular to the sliding direction .
The linear motor according to claim 6, wherein the brush assembly further comprises a fixing member, and the fixing member comprises a fixing body connected with the sliding seat and bent from opposite ends of the fixing body An extended first fixed arm and a second fixed arm, the first fixed arm is connected with the first conductive member, and the second fixed arm is connected with the second conductive member.
The linear motor according to claim 8, wherein the secondary assembly further comprises a support member, the support member connects the base with the first outlet end and the second outlet end.
The linear motor according to claim 6, wherein the primary assembly further comprises an armature iron core, the armature iron core comprises a first base plate fixed on the sliding seat, the at least one armature The winding is fixed on the first substrate.
The linear motor according to claim 10, wherein the armature core further comprises at least one first tooth portion disposed on the first base plate, and the armature winding is sleeved on the first teeth.
The linear motor according to claim 6, wherein the secondary assembly further comprises a field core, the field core comprises a second base plate fixed on the base, and the plurality of field windings are fixed on the base the second substrate.
The linear motor according to claim 12, wherein the field core further comprises a plurality of second tooth portions disposed on the second substrate, and the plurality of field windings are respectively sleeved on the plurality of a second tooth.
The linear motor according to claim 7, wherein the brush assembly further comprises a fixing member, and the fixing member comprises a fixing body connected with the base and bent from opposite ends of the fixing body An extended first fixed arm and a second fixed arm, the first fixed arm is connected with the first conductive member, and the second fixed arm is connected with the second conductive member.
The linear motor according to claim 14, wherein the secondary assembly further comprises a support member, the support member connects the sliding seat with the first outlet end and the second outlet end.
The linear motor according to claim 7, wherein the primary assembly further comprises an armature iron core, the armature iron core comprises a first substrate fixed on the base, the at least one armature The winding is fixed on the first substrate.
The linear motor according to claim 7, wherein the secondary assembly further comprises a field core, the field core comprises a second base plate fixed on the sliding seat, and the plurality of field windings are fixed on the second substrate.
The linear motor according to claim 1, wherein the linear motor further comprises a guide rail assembly slidably connecting the base and the sliding seat.
The linear motor according to claim 18, wherein the base comprises a first plate body, a support plate bent and extended from both sides of the first plate body, and a support plate disposed on the support plate away from the A first mounting portion on one end of the first plate body, the sliding seat includes a second plate body and a second mounting portion provided on both sides of the second plate body, and the guide rail assembly includes a second mounting portion respectively mounted on the first plate body The first guide rail and the second guide rail on the installation part and the second installation part, the first guide rail and the second guide rail are slidably connected.
The linear motor according to claim 1, characterized in that, the linear motor further comprises a detection component, the detection component comprises a scale and a scale read head, and the scale is fixed on the base and the slider. One of the seats, the scale read head is fixed to the other of the slide seat and the base, and the sensing end of the scale read head faces the scale.