Arrangement for the inductive transmission of signals between a stationary point and a rotating electric machine part

• US 3,876,998 A
• Filed: 09/20/1973
• Issued: 04/08/1975
• Est. Priority Date: 09/28/1972
• Status: Expired due to Term

• Current Assignee: Ingo Kroger, Martin Richter
• Original Assignee: Ingo Kroger, Martin Richter
• Inventors: Richter, Martin, Kroger, Ingo
• Primary Examiner(s): Habecker, Thomas B.
• Application Number:
  US05/399,350
• Time in Patent Office: 565 Days
• Field of Search: 340/189M
• US Class Current: 340/870.31
• CPC Class Codes: G01K 13/08 in rotary movement
• CPC Class Codes: H04B 5/263 Multiple coils at either side

Abstract

An improved arrangement for the interference free, inductive transmission of data between a stationary point and a rotating part of an electric machine, which data may be transferred in either direction, comprising two hollow cylindrical structures of non-magnetic material both of which surround the machine shaft and one of which is mounted thereto, the other being mounted to a stationary point with the two cylindrical structures disposed side by side or coaxially and each cylindrical structure having on its surface a plurality of flat coil loops which are side by side and behind each other, the coils of one structure being coupled to means for transmitting signals and those of the other structure to means for receiving whereby data may be transmitted inductively through a gap between the hollow structures.

Claims

1. Apparatus for the inductive transmission of data between a stationary point and a rotating electrical machine part comprising:

a. a first hollow cylindrical structure of nonmagnetic material surrounding and secured to the shaft of the machine and containing thereon a first set of at least two flat coils in loops arranged one behind the other around the circumference of the structure and a second set of at least two flat coils located beside said first set and also arranged around the circumference of said structure one behind the other;

b. a second hollow cylindrical structure of non-magnetic material concentric with the shaft and disposed coaxially with respect said first hollow cylindrical structure and attached to a stationary point, an annular air gap being formed between said first and second structures, said second hollow cylindrical structure having on its surface a third set of at least two flat coils arranged in loops one behind the other around the circumference of said structure and a fourth set of at least two flat coils arranged in loops one behind the other around the circumference of said structure beside said third set;

c. transmitting means coupled to one of said first and second sets of coils on said first hollow cylindrical structure and said third and fourth sets of coils on said second hollow cylindrical structure; and

d. receiving means coupled to the other said sets of coils.

2. The invention according to claim 1 wherein on at least one of said first and second hollow cylindrical structures said flat coils are applied to the inside surface.

3. The invention according to claim 1 wherein adjacent flat coils on said first and second hollow cylindrical structures are connected in series opposition.

4. The invention according to claim 1 wherein the width of the inner space between legs of said flat coils of one said first and second hollow cylindrical structures is larger than the corresponding width in the other of said hollow structures.

5. The invention according to claim 4 wherein said width is matched to the longitudinal displacement of the machine shaft with said width being larger the larger the displacement is.

6. The invention according to claim 1 wherein each of said first and second hollow structures is divisible at least into halves thereby permitting the modification or retrofitting of a pre-existing machine.