WO1997025765A1 - Antriebsvorrichtung mit mehreren flachen linearmotoren - Google Patents
Antriebsvorrichtung mit mehreren flachen linearmotoren Download PDFInfo
- Publication number
- WO1997025765A1 WO1997025765A1 PCT/EP1997/000070 EP9700070W WO9725765A1 WO 1997025765 A1 WO1997025765 A1 WO 1997025765A1 EP 9700070 W EP9700070 W EP 9700070W WO 9725765 A1 WO9725765 A1 WO 9725765A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- drive device
- rotor
- plate
- linear motors
- windings
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
- H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/32—Cam systems or assemblies for operating knitting instruments
- D04B15/36—Cam systems or assemblies for operating knitting instruments for flat-bed knitting machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
Definitions
- the invention relates to a drive device with a plurality of flat linear motors which are arranged next to one another and each have a plate-shaped stator, a plate-shaped rotor and at least one magnet generating a magnetic field or windings through which current flows.
- a knitting machine with such a drive device is known from US Pat. No. 4,768,357, with which the individual needles of the knitting machine are moved back and forth.
- permanent magnets are fastened on the outer surfaces of the plate-shaped rotors which move the needles.
- Coil windings are attached to the sides of the stators facing the rotors.
- the invention is therefore based on the object of providing a drive device with linear motors which has very flat linear motors and thus a large number of linear motors per centimeter and which can be operated with a low power consumption.
- the object is achieved according to the invention in that the windings are inserted in the rotor. Since the windings are much lighter than permanent magnets, the weight of the rotors can be reduced considerably, with the result that the energy to be applied to accelerate and decelerate the rotor, but also the mechanical stress and wear on the linear motors, are significantly lower is so that the linear motors can be built simpler and lighter and have a longer service life. By inserting or embedding the windings in the rotor, there is again a reduction in the width of the linear motor.
- An embodiment of the invention is particularly advantageous in which the rotor consists of an insulating material in which the windings are inserted or embedded.
- the insulating material should have the lowest possible specific weight. It is advantageous here to use a printed circuit board that is provided with windings, be it through printed lines or wires that run in corresponding grooves or bores in the printed circuit boards.
- the stated object is additionally or alternatively also achieved in that the magnets are inserted in a plate of the stator. Since the relatively heavy magnets are now part of the stator and do not have to be accelerated and braked, it is possible to borrow less energy for the drive.
- the drive device is significantly increased.
- the drive device has significantly more linear motors per centimeter, that is to say a higher density than conventional drive devices, because the magnets are not arranged on the surface of a stator plate, but instead are inserted into the plate, and the linear motors can thereby be constructed much narrower.
- the magnets can also be attached to or in magnetic flux return plates of the stators, it is particularly advantageous to manufacture the plate into which the magnets are inserted from a non-magnetic material. This is particularly advantageous if - as will be described in the following - a drive device is selected as described in the unpublished DE-A-195 04 641, namely to combine several linear motors into one package and to allow the magnetic flux to flow through the linear motors of the package in series connection.
- the width or thickness of the plate is less than or equal to the width of the magnets.
- the plate does not add to the width of the individual linear motors. It is advantageous to keep the width of the magnets small, insofar as this is possible with regard to the magnetic field to be generated by the magnet.
- the magnets which according to the invention are arranged on the stator side, are preferably permanent magnets. However, it is also possible to use electromagnets if this is advantageous in terms of construction or in view of the operation of the arrangement.
- linear motors are combined to form a package, as described in the previously mentioned, not previously published DE-A-195 04 641.
- the inner yoke plates can be omitted and only yoke plates are provided on the outside of the package. Additionally or alternatively, however, inner yoke plates are also provided for each individual linear motor, the inner yoke plates of at least some of the linear motors in a package being thinner than the outer yoke plates. The thickness of the inner yoke plates is only to be selected with regard to the magnetic load.
- the magnets are arranged on the inner yoke plates or are inserted or embedded in the inner yoke plates.
- the yoke plates have recesses in which the permanent magnets with the magnetically insulating regions surrounding them are inserted.
- bearing and / or guide elements are additionally or alternatively provided for the runners in accordance with the invention in order to keep the wear and in particular also the frictional forces during operation of the drive device as small as possible.
- the storage and / or guide elements are preferred as sliding sleeves and / or rotating elements, such as wheels or rollers, the outer peripheries of which preferably have a circumferential groove for guiding the rotor.
- the bearing and / or guide elements are provided on the rotor, but it is also possible to provide them on the stator, in which the rotor then slides or rolls.
- at least the edges of the rotor are preferably made of a special material and / or the bearing and / or guide elements are made of a particularly abrasion-resistant, resistant material.
- a bearing and / or guide element is provided at the end regions of the edges of the runner, which are in particular glued to the runner and / or are mechanically fastened in some other way.
- the drive device according to the invention can be used for a wide variety of applications. However, their use for driving needles of a knitting machine, in particular a flat knitting machine, is particularly advantageous.
- FIG. 1 is a schematic perspective view of a linear motor element of the drive device according to the invention
- FIG. 2 shows a cross section along the section line II-II shown in FIG. 1
- FIG. 3 shows a schematic cross-sectional view of an embodiment of the rotor according to the invention
- FIG. 4 shows a schematic cross-sectional view of a stator plate with inserted permanent magnets
- 5 shows a schematic cross-sectional illustration of a plurality of linear motors combined to form a package
- FIG. 7 is a perspective, schematic representation of a bearing and / or guide element
- Fig. 9 is a side view of the rotor with attached storage and / or guide elements.
- FIG. 10 shows a cross section along the section line X-X shown in FIG. 9.
- a rotor 1 is provided with windings 2 inserted or attached therein, which is movable with respect to fixed permanent magnets 3 assigned to a stator.
- the stator has magnetic return plates 4, 5, which enable magnetic flux feedback of the magnetic flux formed by the permanent magnets 3.
- the front yoke plate 5 is omitted in FIG. 1.
- the structure of linear motors and their mode of operation is generally known and is described, for example, in the book Budig "Linearmotoren", Verlagtechnik, Berlin, 1977, or in the article by Y. Kanu et al. in Electrical Engineers of Japan, Vol. MAG-85, No. 111-119, pages 77-86 described in detail. In order to avoid repetition, reference is made to these publications and in this respect made them the content of the present application.
- the permanent magnets 3 are attached to the yoke plates 4, 5 of the stators.
- the windings 2 are also mounted on the runners 1.
- the width, ie the dimensions in the X direction, of each individual linear motor becomes enlarged by the applied magnets and windings.
- the windings in this embodiment of the invention are inserted or embedded in rotor 1, so that the width of rotor 1 and thus also the mechanical air gap ⁇ is reduced by the dimension 2d ⁇ .
- the width of the linear motor can thus also be reduced by 2d ⁇ .
- the width of the linear motors, rotors, yoke plates or the drive device As the width of the linear motors, rotors, yoke plates or the drive device, the dimension perpendicular to the direction of movement of the rotors, i. H. understood in the X direction shown in FIG. 2.
- the motor width or pitch t of a packet can be further reduced by the fact that the permanent magnets 3, which in the embodiment shown in FIG , 5 are arranged, are now inserted or embedded in a plate made of non-magnetic material.
- FIG. 5 shows an embodiment of the drive device according to the invention with a plurality of linear motors combined in a package, in which the return plates 4, 5 can be made much thinner than is the case with conventional linear motors due to the package arrangement.
- the dimensioning of the material thickness for the yoke plates 4, 5 must correspond to the magnetic interfacial forces occurring between them
- Vs / Am A area m 2
- B magnetic induction Vs / m 2
- the yoke plates 4, 5 are therefore wider or thicker than is necessary due to the magnetic load.
- a reduction in the thickness of the linear motors ie smaller dimensions in the x direction shown in FIG. 2, can be achieved by combining several motors to form a "module" or package. Since the yoke plates 7 located inside are only subjected to the magnetic stresses, they can be made thinner and thus n * (d 2 -d 3 ) can be saved or reduced in the x direction, ie the motor width, whereby n is the number of linear motors per package, d 2 is the thickness of the conventional, "thick" return plates 4, 5, and d 3 is the thickness of the inner, "thin” return plates 7.
- the dimensions from linear motor to linear motor within a package that is to say the division t of the package or module, can thus be significantly reduced with the features according to the invention.
- FIG. 6 shows two packages 8, 9 of linear motors in two planes one above the other. If the pitch of the assemblies to be driven, for example the needles of a knitting machine, is smaller than that of the linear motor package, the motors must be offset in the y-direction from one another in order to couple all of these assemblies, that is to say arranged in two or more planes. Multi-dimensionally shaped coupling pieces are then required to actuate the assemblies, for example the needles of a knitting machine.
- the rotor 1 ie the insulating part provided with windings or its edge 10
- the rotor 1 is guided and held in a guide groove or slideway 11 of a bearing and guide element 12.
- the bearing and guide element 12, like the edge of the rotor 1, can consist of a mechanically resistant material and have good sliding properties.
- a rotary element or roller bearing 13 is provided as the bearing and guide element, which has a circumferential groove 14 between outer rings, in which the edge of the rotor 1 runs, and the rotary element 13 yourself a
- Rotation axis 15 rotates.
- the friction is low, so that not only the wear and abrasion remain low, but also the effort required for the movement is low and the power consumption of the linear motors and their acquisition can thus be kept low.
- bearing and guide elements 16 made of a wear-resistant and / or good sliding material are arranged in such a way that they guide the rotor 1 over the entire rotor stroke.
- the bearing and guide elements 16 can, depending on the structural conditions and requirements, be provided both on the rotor 1 and on the stator, or only on the rotor 1 or only on the stator.
- the bearing and guide elements 16 are sliding shoes fastened to the rotor 1, which are guided and stored either in sliding sleeves of complementary design or in roller bearings.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Textile Engineering (AREA)
- Linear Motors (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97900980A EP0873586A1 (de) | 1996-01-10 | 1997-01-09 | Antriebsvorrichtung mit mehreren flachen linearmotoren |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19600610 | 1996-01-10 | ||
DE19600611 | 1996-01-10 | ||
DE19600611.2 | 1996-01-10 | ||
DE19600610.4 | 1996-01-10 | ||
DE19700392A DE19700392A1 (de) | 1996-01-10 | 1997-01-08 | Antriebsvorrichtung mit mehreren flachen Linearmotoren |
DE19700392.3 | 1997-01-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997025765A1 true WO1997025765A1 (de) | 1997-07-17 |
Family
ID=27215815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/000070 WO1997025765A1 (de) | 1996-01-10 | 1997-01-09 | Antriebsvorrichtung mit mehreren flachen linearmotoren |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0873586A1 (de) |
WO (1) | WO1997025765A1 (de) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1981001223A1 (en) * | 1979-10-18 | 1981-04-30 | Burroughs Corp | Flat-coil actuator array for multi-head disk drive |
US4768357A (en) * | 1986-02-13 | 1988-09-06 | Asahi Kasei Kogyo Kabushiki Kaisha | Method for knitting a flat knitted fabric, a flat knitting machine and a novel flat knitted fabric knitted by said flat knitting machine |
US4945268A (en) * | 1987-12-26 | 1990-07-31 | Hitachi, Ltd. | Permanent magnet type linear pulse motor |
JPH0556624A (ja) * | 1991-08-26 | 1993-03-05 | Shinko Electric Co Ltd | リニアモ−タの固定子 |
US5293290A (en) * | 1991-10-17 | 1994-03-08 | Storage Technology Corporation | Stackable linear actuator using embedded coil carriages |
EP0717136A1 (de) * | 1994-12-14 | 1996-06-19 | Tsudakoma Kogyo Kabushiki Kaisha | Antriebsapparat für Nadeln einer Strickmaschine |
DE19504641A1 (de) * | 1995-02-13 | 1996-08-14 | Elektrische Automatisierungs U | Aktuator für den Antrieb von Strickmaschinennadeln |
-
1997
- 1997-01-09 WO PCT/EP1997/000070 patent/WO1997025765A1/de not_active Application Discontinuation
- 1997-01-09 EP EP97900980A patent/EP0873586A1/de not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1981001223A1 (en) * | 1979-10-18 | 1981-04-30 | Burroughs Corp | Flat-coil actuator array for multi-head disk drive |
US4768357A (en) * | 1986-02-13 | 1988-09-06 | Asahi Kasei Kogyo Kabushiki Kaisha | Method for knitting a flat knitted fabric, a flat knitting machine and a novel flat knitted fabric knitted by said flat knitting machine |
US4945268A (en) * | 1987-12-26 | 1990-07-31 | Hitachi, Ltd. | Permanent magnet type linear pulse motor |
JPH0556624A (ja) * | 1991-08-26 | 1993-03-05 | Shinko Electric Co Ltd | リニアモ−タの固定子 |
US5293290A (en) * | 1991-10-17 | 1994-03-08 | Storage Technology Corporation | Stackable linear actuator using embedded coil carriages |
EP0717136A1 (de) * | 1994-12-14 | 1996-06-19 | Tsudakoma Kogyo Kabushiki Kaisha | Antriebsapparat für Nadeln einer Strickmaschine |
DE19504641A1 (de) * | 1995-02-13 | 1996-08-14 | Elektrische Automatisierungs U | Aktuator für den Antrieb von Strickmaschinennadeln |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 017, no. 371 (E - 1396) 13 July 1993 (1993-07-13) * |
Also Published As
Publication number | Publication date |
---|---|
EP0873586A1 (de) | 1998-10-28 |
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