SIGNAL TRANSMITTING SYSTEM FOR ROTATING APPARATUS

• US 3,758,845 A
• Filed: 11/01/1971
• Issued: 09/11/1973
• Est. Priority Date: 05/12/1969
• Status: Expired due to Term

• Current Assignee: Ganton Webster Clarke, John Stewart Mackelvie
• Original Assignee: Ganton Webster Clarke, John Stewart Mackelvie
• Inventors: MacKelvie, John Stewart, Clarke, Ganton Webster
• Primary Examiner(s): Goldberg, Gerald
• Application Number:
  US05/194,378
• Time in Patent Office: 680 Days
• Field of Search: 336/120,122,123 340/194,195,207,177 324/127 323/51
• US Class Current: 340/870.32
• CPC Class Codes: G01R 31/343 in operation
• CPC Class Codes: H01F 38/18 Rotary transformers
• CPC Class Codes: H02K 11/25 Devices for sensing temperature, or actuated thereby

Abstract

This invention relates to a rotary transformer having both windings prewound in a flat rectangular skein for transmitting signals between the rotor and stator of a dynamoelectric machine. Suitably, one skein is wrapped flatwise around, and secured to, the rotor shaft with the second skein being fixedly secured to the stator in a concentric attitude relative to the first skein to permit rotary transformer action between the skeins. In a second disclosed embodiment both rectangular skeins are bent in an arcuate configuration about the rotor axis and are disposed in parallel planes at displaced locations along the axis of rotation. The two coils are designed such that they are coupled inductively at all times during rotation of the rotor.

Claims

1. A signal transmitting system for a dynamoelectric machine comprising a first coil formed of a plurality of turns of an electrical conductor wound in the form of a complete loop, said coil being laid flat upon a substantially cylindrical rotor surface disposed concentrically about the axis of the rotor, two opposite sides of said coil being arcuately disposed about said rotor axis at axially spaced locations along said cylindrical surface, a second coil formed of a plurality of turns on an electrical conductor wound in the form of a complete loop, said second coil being laid flat upon an arcuately shaped stator surface concentrically disposed about the cylindrical rotor surface, two opposite sides of said second coil being arcuately disposed about said rotor axis at axially spaced locations along said stator surface, one said coil having an arcuate length and disposition relative to the other said coil to continuously maintain at least a pre-determined amount of mutual inductive coupling between said first and second coils during rotation of said rotor, means mounted upon said rotor for generating an electrical signal indicative of a pre-determined physical characteristic of said rotor, means connecting said signal generating means to said first coil to transform said electrical signal to said second coil by the continuous mutual induction maintained between said coils during rotor rotation and detection means connected to said second coil for producing an output signal proportional to the detected physical characteristic of said rotor.

2. A signal transmitting system for a dynamoelectric machine according to claim 1 wherein said connecting means include signal processing means and further including a third coil formed of a plurality of turns of an electrical conductor wound in a closed loop, said third coil being laid flat upon said substantially cylindrical rotor surface in co-planar disposition with said first coil, power supply means connected to said second coil, and means connecting said third coil to said signal processing means.

3. A signal transmitting system for a dynamoelectric machine comprising first and second surfaces juxtaposed in axially spaced planes perpendicularly orientated relative to the axis of said machine, one said surface being connected to the rotor of said machine to produce rotary motion between said first and second surfaCes, a first coil formed of a plurality of turns of a conductor wound in the form of complete loops, said first coil being laid flat on said first surface with two opposite sides of the coil being concentrically disposed about said machine axis as radially displaced arcs, a second coil formed of a plurality of turns of a conductor wound in the form of complete loops, said second coil being laid flatwise on said second surface with two opposite sides of the coil being concentrically disposed about said machine axis as radially displaced arcs, the relative size and the arcuate span of said first coil in relation to said second coil being such that at least a minimum amount of mutual induction is continuously maintained between said coils during rotation of said first coil relative to said second coil, means mounted upon said rotor for generating an electric signal indicative of a pre-determined physical characteristic of said rotor, means connecting said signal generating means to the rotary coil to transform said electrical signal to the stationary coil by the continuous mutual induction maintained between said coils during rotor rotation and detection means connected to said stationary coil for producing an output signal proportional to the detected physical characteristic of said rotor.