Abstract
A driven ring assembly for a ring-spinning or ring-twisting machine includes a ring and an electric drive having a stator and a rotor with a magnet. A ring crown is on the ring and a ring traveler is on the ring crown. A connecting portion is between the ring and the rotor. The electric drive includes coil winding strands in the stator that generate a torque and radial forces. An axial degree of freedom and tilting degrees of freedom of the rotor are passively stabilized by reluctance forces and radial degrees of freedom of the rotor are actively stabilized by a control loop controlling current through the coil winding strands.
Claims
1-15. (canceled)
16. A driven ring assembly for a ring-spinning or ring-twisting machine, comprising: a ring; an electric drive comprising a stator and a rotor, the rotor comprising a magnet; a ring crown on the ring, and a ring traveler in contact with the ring crown; a connecting portion between the ring and the rotor; the electric drive further comprising coil winding strands in the stator that generate a torque and radial forces; and wherein an axial degree of freedom and tilting degrees of freedom of the rotor are passively stabilized by reluctance forces and radial degrees of freedom of the rotor are actively stabilized by a control loop controlling current through the coil winding strands.
17. The driven ring assembly according to claim 16, wherein the rotor is a disc rotor and the stator is a flat stator, and wherein a ratio of an axial length (L) of the magnet to a diameter (D) of the magnet is less than 0.4.
18. The driven ring assembly according to claim 16, wherein the stator comprises a temple shape, and a ratio of an axial length (L) of the magnet to a diameter (D) of the magnet being less than 0.4.
19. The driven ring assembly according to claim 16, wherein the ring traveler is provided in a free-moving manner on the ring crown.
20. The driven ring assembly according to claim 16, wherein the ring traveler is provided in a fixed stationary manner on the ring crown.
21. The driven ring assembly according to claim 20, wherein the ring traveler and the ring crown are formed as one piece.
22. The driven ring assembly according to claim 16, further comprising an additional active magnetic bearing located to stabilize axial degrees of freedom of the rotor.
23. The driven ring assembly according to claim 16, further comprising a conductor loop in the stator separated from coil windings to dampen tilting vibrations.
24. The driven ring assembly according to claim 16, further comprising an emergency bearing comprising at least one sliding ring fastened to the stator.
25. The driven ring assembly according to claim 16, wherein the magnet comprises six poles and the stator comprises five winding strands.
26. The driven ring assembly according to claim 16, wherein the magnet comprises six poles and the stator comprises from four to six winding strands.
27. The driven ring assembly according to claim 16, wherein the magnet comprises four poles and the stator comprises four winding strands.
28. A ring-spinning machine, comprising a ring rail and at least one driven ring assembly according to claim 16.
29. The ring-spinning machine according to claim 28, wherein the stator is fastened to the ring rail with a viscoelastic damping element.
30. A ring-twisting machine, comprising a ring rail and at least one driven ring assembly according to claim 16.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0033] The invention is explained in more detail below by means of drawings, in which:
[0034] FIG. 1 is a schematic representation of a ring-spinning machine;
[0035] FIG. 2 is a schematic representation of a driven spinning ring according to the invention in a first embodiment;
[0036] FIG. 3 is a schematic sectional view at point X-X of the embodiment according to FIG. 2;
[0037] FIG. 4 is a schematic representation of a driven spinning ring according to the invention in a second embodiment;
[0038] FIG. 5 is a schematic representation of a fastening means driven spinning ring on a ring rail;
[0039] FIG. 6a, 6b are a schematic representation of a disc rotor with a flat stator in a first embodiment;
[0040] FIG. 7a, 7b are a schematic representation of a disc rotor with a stator in temple shape;
[0041] FIG. 8 is a schematic representation of the degrees of freedom;
[0042] FIG. 9a, 9b are a schematic representation of a disc rotor in a second embodiment; and
[0043] FIG. 10 is a schematic representation of a disc rotor in a third embodiment.
DETAILED DESCRIPTION
[0044] In the following description of the alternative exemplary embodiments represented in the figures, the same reference signs are utilized for features that are identical or at least comparable in terms of their configuration and/or mode of operation. Provided the features are not described in detail again, their design and/or mode of operation correspond/corresponds to the design and mode of operation of the above-described features. For the sake of greater clarity, reference signs for previously described components have not been individually included in the figures.
[0045] FIG. 1 shows a schematic representation of a spinning position of a ring-spinning machine, with today's ring spinning machines having up to 2,000 such spinning positions. In the ring-spinning machine, a fiber structure, a so-called sliver 1, is fed to a drafting system 2. The sliver 1 is drawn into a thread 3 by the drafting system 2. The drafting system 2 shown is a so-called apron drafting system, which is usually used for cotton. Many types of drafting systems 2 are known from the prior art, depending on the application. Downstream of the drafting system 2, the thread 3 is guided to a ring traveler 10 via a thread guide 4. After passing the ring traveler 10, the thread 3 is wound onto the bobbin 5. The bobbin 5 is set in rotation 6 by a drive 7. As a result of this rotation 6 of the bobbin 5, the ring traveler 10 is carried along by the thread 3, which means that the thread 3 is given a twist and the yarn is thus formed. Because the ring traveler 10 is held on the spinning ring 8, the ring traveler 10 is forced to revolve around the bobbin 5. The spinning ring 8 is held in a stationary manner on a ring frame 9.
[0046] FIG. 2 shows a schematic representation of a driven ring according to the invention in a first embodiment in a plan view and FIG. 3 shows a schematic sectional representation at point X-X of the embodiment according to FIG. 2. The stator 12 is fastened on a ring rail 9 using a fastening means 18. The stator 12 shown by way of example has a square shape and is held in a stationary manner in each of the corners thereof using a fastening means 18 in the form of a screw on the ring rail 9. A possible embodiment of this fastening means is shown in FIG. 5. A rotor 13 is arranged inside the stator 12, the stator 12 forming the drive 11 together with the rotor 13. The magnet 17 is connected to the rotor 13. The rotor 13 (respectively the magnet 17 thereof) has an axial length L and a diameter D. The magnet 17 has a number of poles of 4, 6 or 8, for example. The magnet 17 can be designed as a single ring or in segments. The stator 12 and the rotor 13 are arranged concentrically around an axis of rotation 14 of the spinning ring 8. A spinning ring 8 is also arranged concentrically to the drive 11; this is fastened to the rotor 13 in a stationary manner via a connecting portion 16. The spinning ring 8 has a ring crown 15 on which a ring traveler 10 is configured so as to be movable.
[0047] FIG. 4 shows a schematic representation of a driven ring according to the invention in a second embodiment. The rotor 13 having magnets 17 and the stator 12 arranged around the rotor 13 are shown. A spinning ring 8 having a ring crown 15 and a connecting portion 16 is constructed on the rotor 13. The spinning ring 8 is connected to the rotor 13 in a stationary manner via the connecting portion 16. A ring traveler 10 is also fastened to the ring crown 15 in a stationary manner. As a result, the rotor 13 is set in rotation and the spinning ring 8 as well as the ring traveler 10 fastened thereto are also set in rotation by the rotor 13. In contrast to the representation in FIG. 3, the ring traveler 10 is not freely movable on the ring crown 15 but has the same speed at all times as the spinning ring 8 or the rotor 13.
[0048] The displacement sensor 22 for controlling the active radial magnetic bearing is embedded in the stator 12. The emergency bearings 20, which partially encompass the rotor 13 and are configured in the form of rings, are also fastened to the stator 12. The emergency bearings 20 act in the radial as well as in the axial direction. An additional axial magnetic bearing 31 with an associated axial displacement sensor 21 is also shown. A compensation means 19 in the form of a conductor loop is embedded in the stator 12.
[0049] FIG. 5 shows a schematic representation of a fastening means of the driven ring on a ring rail 9. The stator 12 equipped with a compensation means 19 and the radial displacement sensor 22 is provided with passage openings and the ring rail 9 is provided with correspondingly arranged internal threads. The passage openings have an enlarged diameter at their two ends to accommodate damping means 23. By means of the damping means 23, on the one hand, the stator 12 is decoupled from the ring rail 9 and, on the other hand, the stator 12 is decoupled from the fastening means 18. The fastening means 18 is exemplified by a screw. In the case of a screw in the embodiment shown, it is necessary to attach a damping means 23 to both screw ends since otherwise the vibrations would be transmitted from the ring rail 9 via the screw body to the stator 12 (or vice versa).
[0050] FIGS. 6a and 6b show a schematic representation of a so-called bearingless disc rotor in a first embodiment. A plan view and a cross section of the disc rotor with a flat stator 12 are shown. The rotor 13 is arranged inside the stator 12 and the magnet 17 thereof has an axial length L and a diameter D. The rotor 13 and the stator 12 are arranged concentrically around the axis of rotation 14. The magnets 17 are shown schematically on the rotor 13, the number of poles not being shown in the representation. The stator 12 is shown as a laminated core with windings 24 facing the rotor 13 in five strands.
[0051] FIGS. 7a and 7b are a schematic representation of a disc rotor with a stator 12 in temple shape. A plan view and a cross section of the disc rotor are shown. The design of the rotor 13, with the magnets 17 and the axial length L and diameter D thereof, corresponds to the rotor 13 according to FIGS. 6a and 6b. In this embodiment, too, the stator 12 and the rotor 13 are arranged concentrically around the axis of rotation 14. The laminated core of the stator 12 is, however, provided with a greater axial extent than the rotor 13, so that the windings 24, shown in this case as six strands, are arranged in an axial displacement along the axis of rotation 14 with respect to the rotor 13.
[0052] FIG. 8 is a schematic representation of the degrees of freedom. For the sake of simplicity, the rotor 13 is shown as a cylindrical ring. A rotation of the rotor 13 about the axis of rotation 14 takes place, the rotational degree of freedom 25 being indicated. For all direction specifications in FIG. 8, however, the direction specifications also include the specification about an opposite direction. The two tilting degrees of freedom 27 and 28 as well as an axial degree of freedom 26 and both radial degrees of freedom 29 and 30 are also indicated.
[0053] FIGS. 9a and 9b show a schematic representation of a disc rotor in a second embodiment. A plan view and a cross section of the disc rotor are shown. The rotor 13 is arranged inside the stator 12 and the magnet 17 thereof has an axial length L and a diameter D. The spinning ring 8 is fastened to the rotor 13. The rotor 13 and the stator 12 are arranged concentrically around the axis of rotation 14. Four fastening means 18 are provided on the stator 12. The magnets 17 are shown schematically on the rotor 13, a number of poles of six poles being visible in the plan view. The stator 12 is provided with five teeth 34 on each of which a winding 24 is attached, resulting in five strands.
[0054] FIG. 10 shows a schematic representation of a disc rotor in a third embodiment in a plan view. The rotor 13 is arranged inside the stator 12. The rotor 13 and stator 12 are arranged concentrically. Four fastening means 18 are provided on the stator 12. The magnets 17 are shown schematically on the rotor 13, a number of poles of six poles being visible in the plan view. The stator 12 is provided with five teeth 34, resulting in five strands. The windings in the form of coils are attached to the teeth, each inner coil on the tooth 34 being designed as a radial force coil 32 and each outer coil on the tooth 34 being designed as a torque coil 33.
[0055] The present invention is not limited to the represented and described exemplary embodiments. Modifications within the scope of the claims are also possible, as is any combination of the described features, even if they are represented and described in different parts of the description or the claims or in different exemplary embodiments, provided no contradiction to the teaching of the independent claims results.
LIST OF REFERENCE SIGNS
[0056] 1 Sliver [0057] 2 Drafting system [0058] 3 Thread [0059] 4 Thread guide [0060] 5 Bobbin [0061] 6 Rotation bobbin [0062] 7 Drive [0063] 8 Spinning ring [0064] 9 Ring frame [0065] 10 Ring traveler [0066] 11 Drive [0067] 12 Stator [0068] 13 Rotor [0069] 14 Axis of rotation spinning ring [0070] 15 Ring crown [0071] 16 Connecting portion [0072] 17 Magnet [0073] 18 Fastening means [0074] 19 Compensation means [0075] 20 Emergency bearing [0076] 21 Axial displacement sensor [0077] 22 Radial displacement sensor [0078] 23 Damping element [0079] 24 Winding [0080] 25 Rotational degree of freedom [0081] 26 Axial degree of freedom [0082] 27 Tilting degree of freedom [0083] 28 Tilting degree of freedom [0084] 29 Radial degree of freedom [0085] 30 Radial degree of freedom [0086] 31 Axial magnetic bearing [0087] 32 Radial force coil [0088] 33 Torque coil [0089] 34 Tooth of the stator [0090] D Diameter rotor [0091] L Axial length rotor
