Inductive Rotary Joint Comprising Polymer Material

Abstract

The invention relates to an inductive rotary joint having at least two component parts which each comprise a coil for introducing power and/or taking-up power. In order that the rotary joint may be able to withstand even high mechanical load, at least one of the component parts is made of a synthetic resin containing soft magnetic particles, and the coil of the one part is at least partially located in the synthetic resin.

Description

The drawings illustrate 3 examples of embodiment according to the invention in a schematically simplified form. Shown by:

FIG. 1: is a section through a component part of a rotary joint comprising a synthetic resin with soft magnetic particles.

FIG. 2: is a section of a component part of another rotary joint comprising a synthetic resin with soft magnetic particles.

FIG. 3: is a robot arm into which synthetic resin with soft magnetic particles has been cast.

FIG. 4: is a component part of a rotary joint comprising a synthetic resin with soft magnetic particles.

FIG. 5: is a component part of a rotary joint comprising a synthetic resin with soft magnetic particles and other additional components.

FIG. 1 illustrates a section through a component part of a rotary joint comprising a synthetic resin with soft magnetic particles. A U-shaped body (1) of synthetic resin with soft magnetic particles accommodates the winding (5). For example, this may be placed into recesses of the U-shaped body (1), or integrally cast with the material thereof. A coil former (7) provides support for the coil, so that the individual windings are fixed in the recesses. During casting, the winding first may be wound onto the coil support, and then integrally cast with the synthetic resin material. A slide track (8) which is also placed into a groove, or even better, integrally cast, serves for galvanic transmission. The leads (6) of the winding (5) also may be integrally cast with the synthetic resin material and thereby relieved from mechanical tension. An optional central leg may consist of conventional iron or ferrite. Likewise, it may also comprise a synthetic resin material with soft magnetic particles.

FIG. 3 shows a robot arm (12) in which a body (1)(2) of a synthetic resin material with soft magnetic particles is integrally cast to enclose the winding (5). Here the body has, by way of example, the shape of a shell type core with the outer edge (1) and the pocket (2) which are (not visibly) joined together.

FIG. 4 shows a section of another rotary joint. The rotor in the center of the illustration is rotatable relative to the outer stator (shown in section on the left and right hand side thereof) via a shaft (3). This shaft may be also hollow. The component parts (1) of synthetic resin material with soft magnetic particles accommodate the windings (5).

FIG. 5 furthermore shows a component part of a rotary joint in which, in addition, light guides (10) for optical transmission, and also a bearing shell (15) for a bearing have been integrally cast. Moreover, a printed circuit board (16) with capacitive coupling elements (17) is also incorporated.

Claims

1.-12. (canceled)

13. An inductive rotary joint having at least two component parts which are movable relative to each other, and which each have at least one coil for introducing power and/or taking-up power, wherein at least one of the component parts is made of a synthetic resin containing soft magnetic particles, and the coil of the one component part is at least partially located within the synthetic resin.

14. The rotary joint according to claim 13, wherein at least one particle is of ferrite or iron or an iron alloy.

15. The rotary joint according to claim 13, wherein the resin is fiber-reinforced.

16. The rotary joint according to claim 13, wherein at least one other component is at least partially integrally cast with the resin.

17. The rotary joint according to claim 16, wherein one other component is a part of a data transmission path.

18. The rotary joint according to claim 17, wherein one other component is a bearing.

19. The rotary joint according to claim 13, wherein at least one of the component parts comprises a slip-ring.

20. An inductive rotary joint having at least two component parts which are movable relative to each other, and which each have at least one coil for introducing power and/or taking-up power, wherein at least one of the component parts comprises a section made of a soft magnetic synthetic resin.

21. The rotary joint according to claim 20, wherein the section is seated in a groove.

22. The rotary joint according to claim 13, wherein at least one of the component parts directly serves to transmit energy and/or signals, and also is of mechanical functionality.

23. The rotary joint according to claim 20, wherein at least one of the component parts directly serves to transmit energy and/or signals, and also is of mechanical functionality.

24. A method for manufacturing a rotary joint having at least two component parts which are movable relative to each other, of which at least one component part is made at least partially of a synthetic resin, comprising the step of admixing soft magnetic particles with the synthetic resin as a filler.

25. The method according to claim 24, wherein a coil former is at least partially integrally cast with or laminated in the synthetic resin component part.