DE102009018866A1 - Linear drive arrangement, has yoke with two U-shaped yoke parts directed to each other, and another yoke part provided between yoke parts, where yoke and carriage with guidance are provided on support plate in direction of motion of coil - Google Patents

Abstract

The arrangement has a moved coil (5) connected with a carriage supported in guidance accommodating an element e.g. mirror. A stationary magnetic circuit has a multipart yoke and magnets (10), where the coil encompasses a part of the yoke. The yoke is divided in plane of direction of motion of the coil, and includes two U-shaped yoke parts (1, 2) directed to each other. A third yoke part is provided between the parts. The carriage guide is formed as a double rail-ball/role guide. The yoke and the carriage with guidance are provided on a support plate (4) in a direction of motion of the coil.

Description

The The invention relates to a linear drive arrangement with fixed Magnetic circuit and current-carrying, moving coil, which with a carriage mounted in a guide for receiving an element to be positioned is in communication, wherein the Magnetic circuit having a multi-part yoke and permanent magnets and the coil surrounds a part of the yoke, according to the preamble of Patent claim 1.

From the DE 10 2006 052 364 A1 is a precision linear drive with fixed magnetic circuit and moving coil previously known. The coil is used to move a component to be positioned. According to the local solution, there is firstly a main guide and, in addition, a secondary guide in order to enable a safe, backlash-free movement in accordance with the selected coordinate direction. The main guide comprises a movable main guide element having a base with a receptacle for rolling elements. The yoke according to the arrangement DE 10 2006 052 364 A1 consists of two E-shaped parts. The parting line of the magnetic circuit is perpendicular to the direction of movement of the coil. The attachment of the necessary permanent magnets can be made in this embodiment, only after mounting the E-shaped yoke parts on a support body. In addition, a subsequent adjustment of a gap for the required free mobility of the coil is not possible or only with difficulty. The guide elements in the form of a main and secondary guide are on the one hand space-consuming and on the other hand associated with higher production costs.

From the US 2006/0120819 A1 a three-axis micropositioning drive is previously known which has various linear drives. According to a local embodiment, a yoke is formed in five parts, wherein a central yoke part simultaneously forms a rail for a current-carrying, moving coil. The middle yoke part laterally adjacent webs are associated, which receive an upper and lower yoke, said upper and lower yoke are associated with permanent magnet strip.

From the DE 41 34 100 A1 is a linear motor drive with a rail previously known, wherein the rail is used to receive a carriage. Rail and carriage are connected via a plurality of rolling bearing elements in connection to ensure a secure longitudinally displaceable guide. Rail and carriage have a U-profile in cross-section and are directed with their U-shaped legs to each other such that the rail receives the actual carriage in its leg gap almost flush.

The state of the art is still on the DE 196 01 018 A1 referenced, which discloses a linearly adjustable precision table, which comprises a linear drive for adjusting a cover plate relative to a base plate for movement in at least one coordinate axis. The linear drive in turn has a magnet and a coil. The magnet or the coil of the linear drive are in this case arranged so that the linear drive exerts a resultant force centrally on the plate to be moved.

at Linear drives according to the known plunger drive is the physical Principle of the Lorentz force used. Usually wise Such linear drives on rectangular coils, the order a cuboid iron core wrapped within two cuboid high-performance magnets are arranged. These high-performance magnets are usually located on outer iron yoke parts. Inner core as well the outer iron part form the yoke for the thus designed linear motor.

The Magnetic field of the high-performance permanent magnets used is directed radially to the coil package or the coil assembly, wherein with power supply, the axially directed Lorentz force on the Coil works. The coil is then removed from the magnetic space of the moved magnet fixed to the frame fixed to the frame. A reversal of movement can be achieved by energization reversal. Coil current and the linear force of the drive behaves proportionally to each other, so that the strength of the driving force usually very sensitive about the operating current of the coil can be regulated. For achieving a corresponding fine positioning Incremental path measuring systems are used, which are usually associated with the regulation of the linear motor.

outgoing from the above-described prior art, the object of Invention therein, an advanced linear actuator assembly with fixed magnetic circuit and current-carrying, moving Specify coil, which occupies only a small space and the enough room volume for the recording to be moved Elements, e.g. B. a mirror of an interferometer available provides. Furthermore, the to be created linear drive assembly be very easy to install and be produced at low cost.

The Solution of the object of the invention is achieved by the feature combination according to claim 1, wherein the dependent claims at least expedient Represent refinements and developments.

It is therefore assumed that a linear drive assembly with fixed magnetic circuit and current-carrying, moving coil, wel surface is in communication with a carriage mounted in a guide for receiving an element to be positioned. The magnetic circuit has a multi-part yoke and permanent magnets, wherein the coil surrounds a part of the yoke, which virtually forms the coil core.

According to the invention the yoke is divided in the plane of the direction of movement of the coil. The Yoke initially has two U-shaped, facing each other first yoke parts and a third, between the first yoke parts located on another yoke part, wherein the third yoke part the Coil absorbs.

Of the Carriage is connected via a coupling part with the coil in operative connection and it is the carriage guide as a double rail ball rolling guide educated.

yoke and sledges with guide are on a rack plate arranged side by side in the direction of movement of the coil.

Ausgestaltend is on the top of the rack plate opposite U-shaped yoke part an electrical wiring carrier, z. As a circuit board, arranged, which or which in the direction the carriage survives at least partially relative to the yoke dimensions, a flexible, laid in open loop ribbon cable end take. The other end of the ribbon cable is then with the coil in electrical connection to the necessary energization perform.

The Yoke parts are positively connected with each other, wherein the distance setting between the U-legs of the first Yoke parts and the surface of the third yoke part liners, z. B. in the form of film strips, can be arranged.

The central, third yoke part points over its length a rectangular or square cross section, the clear open cross-sectional area of the coil is adjusted.

The Coupling is still ausgestaltend with a guide plate connected. The guide plate is on the slide fixed.

The Guide plate can be at one of its in the direction of movement extending surface sides an incremental scale for an electronic path measuring system, with a sensor located on the frame plate cooperates.

The illustrated yoke parts form a sandwich arrangement in Result of their assembled state.

The first U-shaped yoke parts can be at their yoke ends Projections or projections with recesses or holes for non-positive connection, in particular screwing exhibit.

The Level of the double rail guide runs in Substantially perpendicular to the plane of the arrangement of the stacked yoke parts. In the thighs spread thereby, d. H. a first leg from the yoke part sandwich arrangement and a second leg Slide guide and guide plate results a free space volume, which is used to hold the elements to be moved, z. B. a mirror or a prism of an interferometer can be used.

At the inside of the connecting leg of the first U-shaped Yoke parts are the respective permanent magnets fixed, this Fixing preferably cohesively, d. H. done by gluing.

in the Comparison with the prior art is in the presented inventive Solve the coil directly with a single guide, in particular connected to a rolling guide. The Yoke itself is in three parts with horizontal joining levels provided, allowing easy production and easier installation is possible.

to Energizing the coil is a flexible ribbon cable present forcibly guided with a plug connection on a wiring carrier is connected, wherein on the wiring support at least Portions of the power supply and regulator circuitry included could be.

The Invention will be described below with reference to an embodiment and explained in more detail with the aid of a figure become.

The FIG. 1 shows a perspective view of the invention Linear drive assembly, the linear drive assembly in longitudinal side view and a supplementary view of the drive assembly of viewed from the front side.

On a rack plate 4 First, there is the sandwich arrangement of the various yoke parts.

The yoke parts comprise two U-shaped, mutually facing first yoke parts 1 and 2 , The yoke part 1 is called the lower U-yoke part and the yoke part 2 referred to as the upper U-yoke part.

Between the lower U-yoke part 1 and the upper U-yoke part 2 is a cuboid yoke core 3 as the third yoke part.

The third yoke part, ie the cuboid yoke core 3 serves to accommodate the substantially square or rectangular coil 5 ,

High-performance magnets 10 are located on the respective inner side of the U-connecting leg at the lower yoke part 1 and upper yoke part 2 , spacers 9 serve the exact positioning of the high-performance magnets 10 in the connection, in particular by gluing with the respective yoke part 1 respectively. 2 ,

On the rack plate 4 , the sandwich arrangement of the yoke parts 1 . 2 and 3 adjacent, is a lower U-shaped, flat running profile 8b in which an inner profile 8a is arranged. Between the profiles 8a and 8b are not shown in the figure balls introduced to create a ball roller guide.

The profile 8a So it is in the profile recess of the profile 8b longitudinal displacement.

It therefore forms the profile 8a a sled.

The carriage takes a guide plate 7 on. At the guide plate 7 is a coupling part 6 arranged, with its free end with the coil 5 communicates and absorbs these.

On the long side of the guide plate 7 can be an incremental scale 12 be attached, with a sensor arrangement 11 communicates to form a position measuring system.

Above the upper yoke part 2 , ie on its top, is a wiring carrier 13 , z. B. arranged in the form of a regulator and power supply board.

This wiring carrier 13 protrudes laterally in the direction of the carriage and receives a connector, which is the connection of a flexible ribbon cable 14 serves. About the flexible ribbon cable 14 becomes the coil 5 supplied the necessary operating current.

The Ribbon cable is, as shown in the figure, as an open U-shaped Loop laid. An obstruction to the movement of the slide including the coil does not take place by the ribbon cable.

The yoke parts 1 and 2 have extensions in the embodiment shown in the figure 15 on, the recesses 16 have. The recesses 16 can screws 18 for frictional connection of the individual yoke parts record.

As can be seen from the illustrations, the plane of the double ball roller guide is substantially perpendicular to the arrangement of the stacked yoke parts 1 to 3 , This results in a very large free volume 17 for receiving moving elements on the guide plate 7 or on the carriage thus formed.

In the illustrations according to the figures, the linear drive accordingly comprises a rectangular coil 5 , which surround a cuboid iron yoke core 3 is wound and which is within two cuboid high-performance magnets 10 located. These high performance magnets are as explained on the outer iron yoke parts 1 and 2 appropriate. The inner core 3 and the outer U-shaped yoke pieces of iron 1 and 2 form the illustrated sandwiched yoke for the linear motor.

The magnetic field of the high-performance magnets 10 is directed radially to the coil, being at the power supply by means of the ribbon cable 14 the axially directed Lorentz force acts on the coil. The coil is thereby moved out of the space of the frame-fixed magnet. A reversal of motion is possible by Strompolungsuplolung easily.

The accuracy of fine positioning depends on the quality of the incremental position measuring system used with the scale 12 on the carriage and fixed to the frame arranged opposite sensor 11 from. By coupling the coil with the guide plate in a ball roller guide 8a and 8b results in a high-precision, dynamic and low-friction positioning of the guide carriage.

Because of that on the guide plate 7 on the ball roller guide 8a and 8b to acquire Wegmessinformationen preferably laterally of the mentioned incremental scale 12 with opposite sensor 11 There is the possibility to customize the electronic position measuring system. Here, only a software adaptation to the controller concerned is necessary. At the bottom of the wiring harness 13 is a fixation for the power ribbon cable 14 located (not shown), allowing a defined unwinding of the ribbon cable 14 during travel of the coil 5 can be done.

1

lower U-shaped yoke part

2

upper U-shaped yoke part

3

cuboid Yoke core / third yoke part

4

frame plate

5

Kitchen sink

6

coupling part

7

guide plate

8a and 8b

U-shaped Rails for the formation of the ball roller guide

9

spacer

10

High-performance magnet

11

sensor

12

incremental scale

13

Wiring support assembly

14

Power cable

15

extension

16

recess

17

Volume / free space

18

Connecting member / screw

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102006052364 A1 [0002, 0002]
• US 2006/0120819 A1 [0003]
• - DE 4134100 A1 [0004]
• - DE 19601018 A1 [0005]

Claims (9)

Linear drive assembly with fixed magnetic circuit and current-carrying, moving coil, which is in communication with a slide mounted in a guide for receiving a member to be positioned, wherein the magnetic circuit having a multi-part yoke and permanent magnets and the coil surrounds a part of the yoke, characterized in that the yoke is divided in the plane of the direction of movement of the coil and two U-shaped, facing each other first yoke parts and a third, located between the first yoke parts further yoke part which accommodates the coil comprises, the carriage via a coupling part with the coil in connection is and the carriage guide is designed as a double rail ball roller guide and continue to yoke and slide with guide on a frame plate in the direction of movement of the coil are located side by side. Linear drive arrangement according to claim 1, characterized characterized in that on the top of the frame plate opposite U-shaped yoke part of an electrical wiring board is arranged, which in the direction of the carriage at least partially relative to the dimensions of the yoke, to provide a flexible, to record in open loop laid ribbon cable end, which is in electrical connection with the coil. Linear drive arrangement according to claim 1 or 2, characterized characterized in that the yoke parts frictionally with each other be connected, wherein the distance between the U-thighs of the first yoke parts and the surface of the third yoke part liners can be arranged. Linear drive arrangement according to one of the preceding Claims, characterized in that the central, third Yoke part over its length a rectangular or having cuboid cross-section. Linear drive arrangement according to one of the preceding Claims, characterized in that the coupling part connected to a guide plate and the guide plate fixed on the carriage and continue the guide plate at its surface in the direction of movement an incremental scale for an electronic Distance measuring system has. Linear drive arrangement according to one of the preceding Claims, characterized in that the yoke parts a Form sandwich arrangement. Linear drive arrangement according to claim 6, characterized in that the first U-shaped yoke parts their yokes extensions with recesses or holes for non-positive connection, in particular screwing exhibit. Linear drive arrangement according to one of the preceding Claims, characterized in that the plane of the double Rail guide substantially perpendicular to the plane of the Arrangement of the stacked yoke parts runs. Linear drive arrangement according to one of the preceding Claims, characterized in that on the inside the connecting leg of the first U-shaped yoke parts each permanent magnet, preferably cohesively fixed are.