WO2022047887A1

WO2022047887A1 - Linear motor

Info

Publication number: WO2022047887A1
Application number: PCT/CN2020/120493
Authority: WO
Inventors: 郭顺; 史卫领; 郑高伟
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: CN213661411U

Abstract

A linear motor (100), comprising: a sliding seat (20), a base (10) slidably connected to the sliding seat (20), a primary assembly (30), a secondary assembly (40) and an electric brush assembly (70), wherein the primary assembly (30) and the electric brush assembly (70) are fixed to one of the base (10) and the sliding seat (20), and the secondary assembly (40) is fixed to the other of the base (10) and the sliding seat (20); the primary assembly (30) comprises at least two armature windings (32) which are spaced apart and a connecting member (33) which is connected to the two armature windings (32), and the at least two armature windings (32) are used to generate a traveling-wave magnetic field; the secondary assembly (40) and the primary assembly (30) are opposite and spaced apart from each other, and the secondary assembly (40) comprises a plurality of excitation windings (42) which are arranged at intervals; and the electric brush assembly (70) is electrically conducted to the excitation windings (42) corresponding to the primary assembly (30), such that the secondary assembly (40) generates an excitation magnetic field, and the traveling-wave magnetic field and the excitation magnetic field interact with each other to push the base (10) or the sliding seat (20) to slide in a sliding direction. The linear motor (100) reduces copper loss and runs more smoothly.

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 stroke of the linear drive motor is approximately longer, and the length of the secondary drive assembly is also longer, thereby increasing the magnetic yoke and 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. In addition, linear motors are subject to thrust fluctuations during operation, reducing performance.

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 capable of reducing thrust fluctuation.

technical solutions

In order to achieve the above object, the present invention provides a linear motor, which includes: a sliding seat, a base slidably connected to the sliding seat, a primary assembly, a secondary assembly and a brush assembly, the primary assembly and a brush assembly is fixed to one of the base and the sliding seat, and the secondary assembly is fixed to the other of the base and the sliding seat; the primary assembly includes at least two sets of spaced armatures A winding and a connecting piece connecting the two groups of armature windings, the at least two groups of armature windings are used for generating traveling wave magnetic fields; a secondary assembly, opposite to the primary assembly and arranged at intervals, the secondary assembly includes A plurality of field windings arranged at intervals; a brush assembly, the field windings corresponding to the primary assembly are electrically connected to enable the secondary assembly to generate an exciting magnetic field, and the traveling wave magnetic field interacts with the exciting magnetic field to promote The base or slide slides in 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 along a first axis perpendicular to the sliding direction. The directions are opposite and spaced apart; the primary assembly and the brush assembly are opposite and spaced 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 along a first axis perpendicular to the sliding direction. The directions are opposite and spaced apart; the primary assembly and the brush assembly are opposite and spaced along a second direction perpendicular to the sliding direction.

Preferably, the primary assembly further comprises at least two spaced armature cores fixed on the sliding seat or the base, the armature cores are respectively connected with the armature windings, and the connecting pieces The two adjacent armature iron cores are connected, and the connecting piece is made of insulating material.

Preferably, each of the armature cores includes a first base plate fixed to the sliding seat or the base, and the at least one armature coil is fixed to the first base plate.

Preferably, each of the armature cores 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 brush assembly includes at least two brush members, each of which is spaced apart from and opposite to one of the armature windings.

Preferably, the brush member includes a first brush piece, a second brush piece, and a fixing member connecting the first brush piece and the second brush piece to the sliding seat or the base, the first electric brush piece The brush piece and the second brush piece are electrically connected with the corresponding excitation winding.

Preferably, each of the excitation windings includes a first outlet end and a second outlet end; the secondary assembly further includes a plurality of spaced first conductive blocks and a plurality of spaced second conductive blocks, the first conductive blocks The blocks are opposite to the second conductive blocks and are arranged at intervals; each of the first outlet ends is electrically connected to each of the first conductive blocks; each of the second outlet ends and each of the second conductive blocks Electrical connection; the first electric brush piece is in contact with the corresponding first conductive block and is in electrical conduction; the second electric brush piece is in contact with the corresponding second conductive block and is in electrical conduction.

Preferably, the secondary assembly further includes a plurality of first insulating members and a plurality of second insulating members, each first insulating member is connected between two adjacent first conductive blocks, and each second insulating member is connected Between two adjacent second conductive blocks; the first insulating member and the second insulating member are arranged at intervals.

Preferably, the secondary assembly further includes an excitation core, the excitation core includes a second base plate fixed on the base or the sliding seat, 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 arranged on the second base plate and spaced along the sliding direction, and the plurality of field windings are respectively sleeved on the plurality of second teeth. teeth.

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 read head, the scale is fixed on the base or one of the sliding seat, the scale The read head is fixed to the other of the sliding seat or the base, and is arranged opposite to the scale.

beneficial effect

Compared with the related art, the base and the sliding seat of the above-mentioned linear motor are relatively moved by the driving of the armature winding and the excitation winding, the material cost of the armature winding and 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 two adjacent armature windings are connected by the connecting piece, which reduces the cost of the linear motor. The thrust fluctuation during operation makes the linear motor run more smoothly.

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 armature core and the armature winding of the primary assembly of the linear motor shown in FIG. 1 .

FIG. 3 is a schematic diagram of a three-dimensional combined structure of a primary assembly and a sliding seat of the linear motor shown in FIG. 1 .

FIG. 4 is a schematic diagram of an exploded structure of the secondary assembly of the linear motor shown in FIG. 1 .

FIG. 5 is a schematic three-dimensional structure diagram of the linear motor shown in FIG. 1 .

FIG. 6 is a schematic cross-sectional structure diagram of FIG. 5 along the A-A direction.

FIG. 7 is an enlarged view of part B shown in FIG. 5 .

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 drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but 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. 1-7 , the linear motor 100 provided according to the embodiment of the present invention includes a base 10 , a guide rail 50 , a sliding seat 20 , a primary assembly 30 , a secondary assembly 40 , and a brush assembly 70 . The base 10 and the sliding seat 20 are slidably connected by the guide rails 50 . The primary assembly 30 and the brush assembly 70 are fixed to one of the base 10 and the carriage 20, and correspondingly, the secondary assembly 40 is fixed to the other. The primary assembly 30 is used to generate the traveling wave magnetic field, the secondary assembly 40 is used to generate the excitation magnetic field, and the brush assembly 70 is used to supply current to the secondary assembly 40 corresponding to the primary assembly 30 to generate the excitation magnetic field when sliding. The traveling wave magnetic field interacts with the excitation magnetic field to push the base 10 or the sliding seat 20 to slide relatively along the sliding direction X.

In this embodiment, the primary assembly 30 and the brush assembly 70 are both fixed on the sliding seat 20 , and the secondary assembly 40 is fixed on the base 10 . It can be understood that, in other embodiments, the primary assembly 30 and the brush assembly 70 are both fixed on the base 10 , and the secondary assembly 40 is fixed on the sliding seat 20 .

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 The first mounting portion 14 on one end of the body 11 . The secondary assembly 40 is fixed to the first substrate 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 , and the primary assembly 30 and the brush assembly 70 are fixed to the second plate body 21 . The second plate body 21 is described.

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 The base 10 and the sliding seat 20 are slidably connected together. The guide rail assembly 50 and its connected sliding seat 20 and the base 10 together enclose the receiving space 13 . Both the secondary assembly 40 and the primary assembly 30 are accommodated in the accommodating space 13 , and are arranged opposite to each other along the first direction Z perpendicular to the sliding direction X and arranged at intervals. The brush assembly 70 is also accommodated in the accommodating space 13 , and is opposite to and spaced apart from the primary assembly 30 along the second direction Y perpendicular to the sliding direction X. As shown in FIG.

The primary assembly 30 includes at least two armature iron cores 31 spaced along the sliding direction X and at least two armature windings 32 disposed on the armature iron cores 31 and connecting two adjacent armature irons. Connector 33 of core 31 . The connector 33 is made of insulating material. The distance from the end of the first primary assembly 30 to the end of the adjacent second primary assembly 30 is d, specifically, in this embodiment, from the end of the first armature core 31 to The distance between the ends of the adjacent second armature iron core 31 is d; adjusting the size of the distance d can effectively reduce the end positioning force and thrust fluctuation of the linear motor 100 . The number of the primary components 31 may be more than two, and increasing the number of the primary components 31 can reduce the thrust fluctuation of the linear motor 100 and make the linear motor 100 run more smoothly.

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 . The first tooth portion 313 between the plates 312 is connected to the second plate body 21 on the side of the first base plate 311 away from the first tooth portion 313 .

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 through hole 322 through the first through hole 322 . A tooth portion 313 , or directly wound on the first tooth portion 313 through the armature winding body 321 . The numbers of the first teeth 3113 and the armature windings 312 are the same, and the number of the armature windings 312 can be increased according to the driving force required by the primary assembly 31 .

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 The conductive block 43 and the first connecting portion 47 of the first insulating member 45 and the second connecting portion 48 connecting the second conductive block 44 and the second insulating member 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 portion 47 and the second connecting portion 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 portion and the second connecting portion 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 part 47 and the second connecting part 48 are also made of insulating material, and the first connecting part 47 keeps the first conductive block 43 and the first insulating block 45 away from the excitation winding One side of the body 421 is integrally connected, the second connecting portion 48 connects the second conductive block 44 and the second insulating block 46 to the side away from the excitation winding body 421 as a whole, and the first A connecting portion 47 and the second connecting portion 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 49 is electrically connected to the brush assembly 70 .

The brush assembly 70 includes at least two brush pieces 71 , and the brush pieces 71 are both fixed on the sliding seat 20 . Each of the brush members 71 and each of the armature iron cores 31 are arranged in the second direction Y facing and spaced apart. Each brush piece 71 includes a fixing piece 711 fixedly connected with the sliding seat 20 , and a first brush piece 712 and a second brush piece 713 connected with the fixing piece 711 . The fixing member 711 is substantially U-shaped, and includes a fixing body 7111 and a first fixing arm 7112 and a second fixing arm 7113 bent and extending from two sides of the fixing body 7111 , and the fixing body 7111 is fixed to the fixing body 7111 . The second plate body 21 is spaced apart from the primary assembly 30 . The first brush piece 712 is substantially elongated and connected to the first fixed arm 7112 , and the second brush piece 713 is connected to the second fixed arm 7113 . When sliding, one end of the first brush piece 712 away from the first fixing arm 712 contacts with the corresponding first conductive block 43 and is electrically connected, and the second brush piece 713 is away from the One end of the second fixed arm 7113 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 brush piece 712 and the second brush piece 713 slide with the sliding seat 20 and are electrically connected with the primary assembly 30 relative to the secondary assembly 40 The excitation winding 42, but the excitation winding 42 that is not in contact with the first brush piece 712 and the second brush piece 713 is not connected to the power supply, which reduces the loss of resources and greatly reduces the power consumption. Therefore, the copper consumption of the linear motor 100 is reduced, and the efficiency of the linear motor 100 is improved. Moreover, since the two primary assemblies 30 are spaced apart, the end positioning force can be effectively reduced, thereby reducing thrust fluctuations.

The linear motor 100 further includes a detection component 90 for detecting the relative position of the base 10 and the sliding seat 20 . The detection assembly 90 includes a scale 92 and a scale read head 91 , the scale 92 is fixed on the base 10 , and the scale read head 91 is fixed on the sliding seat 20 and is connected with the scale 92 . Relative settings. On the contrary, the scale is fixed on the sliding seat 20 , and the scale reading head 91 is fixed on the base 10 .

Compared with the related art, the base and the sliding seat of the above-mentioned linear motor are relatively moved by the driving of the armature winding and the excitation winding, the material cost of the armature winding and the excitation winding is low, and the production cost of the above-mentioned linear motor is reduced; The component conducts only part of the excitation winding, which greatly reduces the copper loss of the linear motor and improves the efficiency of the linear motor; the arrangement of at least two primary components and the connecting piece connecting the two primary components at intervals reduces the linear The thrust fluctuates when the motor is running, so that the linear motor runs more smoothly.

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

The primary assembly includes at least two sets of spaced armature windings and a connector connecting the two sets of armature windings, and the at least two sets of armature windings are used to generate a traveling wave magnetic field;

a secondary assembly opposite to the primary assembly and disposed at intervals, the secondary assembly including a plurality of spaced field windings;

A brush assembly, the excitation winding corresponding to the primary assembly is electrically connected to make the secondary assembly generate an excitation magnetic field, and the traveling wave magnetic field interacts with the excitation magnetic field to push the base or the sliding seat along the edge Swipe in the direction of swipe.
The linear motor according to claim 1, wherein 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 is connected to the secondary assembly. The assemblies are opposite and spaced apart along a first direction perpendicular to the sliding direction; the primary assembly and the brush assembly are opposite and spaced apart along a second direction perpendicular to the sliding direction.
The linear motor according to claim 1, wherein 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 is connected to the secondary assembly. The assemblies are opposite and spaced apart along a first direction perpendicular to the sliding direction; the primary assembly and the brush assembly are opposite and spaced apart along a second direction perpendicular to the sliding direction.
The linear motor according to claim 2 or 3, wherein the primary assembly further comprises at least two spaced-apart armature iron cores fixed on the sliding seat or the base, the armature iron cores are respectively Connected with the armature winding, the connecting piece connects two adjacent armature iron cores, and the connecting piece is made of insulating material.
The linear motor according to claim 4, wherein each of the armature cores comprises a first base plate fixed to the sliding seat or the base, and the at least one armature coil is fixed to the first base plate. substrate.
The linear motor according to claim 5, wherein each of the armature cores further comprises at least one first tooth portion disposed on the first base plate, and the armature winding is sleeved on the first tooth.
The linear motor according to claim 6, wherein the brush assembly comprises at least two brush members, and each brush member is spaced apart from and opposite to one of the armature windings.
The linear motor according to claim 7, wherein the brush member comprises a first brush piece, a second brush piece, and the first brush piece and the second brush piece are connected to the sliding seat or The fixing part of the base, the first electric brush piece and the second electric brush piece are electrically connected with the corresponding excitation winding.
The linear motor according to claim 8, wherein each of the excitation windings includes a first outlet end and a second outlet end; the secondary assembly further comprises a plurality of spaced first conductive blocks and a plurality of Second conductive blocks arranged at intervals, the first conductive blocks are opposite to the second conductive blocks and are arranged at intervals; each of the first outlet ends is electrically connected to each of the first conductive blocks; each of the second conductive blocks The outlet end is electrically connected to each of the second conductive blocks; the first brushes are in contact with the corresponding first conductive blocks and are electrically connected; the second brushes are in contact with the corresponding second conductive blocks and electrically conducting.
The linear motor according to claim 9, wherein the secondary assembly further comprises a plurality of first insulating parts and a plurality of second insulating parts, and each first insulating part is connected to two adjacent first conductive parts Between the blocks, each second insulating member is connected between two adjacent second conductive blocks; the first insulating member and the second insulating member are arranged at intervals.
The linear motor according to claim 10, wherein the secondary assembly further comprises an excitation core, the excitation core comprises a second base plate fixed on the base or the sliding seat, the plurality of The excitation winding is fixed to the second substrate.
The linear motor according to claim 11, wherein the excitation core further comprises a plurality of second tooth portions arranged on the second base plate at intervals along the sliding direction, the excitation The windings are respectively sleeved on the plurality of second teeth.
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 13, 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 reading head is fixed on the other of the sliding seat and the base, and is arranged opposite to the scale.