ARRANGEMENT FOR THE TRANSMISSION OF CONTROL COMMANDS FROM A STATIONARY PART TO A ROTATING PART OF AN ELECTRIC MACHINE

• US 3,925,694 A
• Filed: 09/20/1973
• Issued: 12/09/1975
• Est. Priority Date: 09/21/1972
• 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): Trammell, James D.
• Assistant Examiner(s): Hickey, Robert J.
• Application Number:
  US05/399,349
• Time in Patent Office: 810 Days
• Field of Search: 310/DIG.3,68D 322/DIG.5,100 307/278,308,309
• US Class Current: 310/68.00D
• CPC Class Codes: H02K 19/36 Structural association of synchronous generators with auxiliary electric devices influencing the characteristic of the generator or controlling the generator, e.g. with impedances or switches
• CPC Class Codes: Y10S 310/03 Hall effect generators and converters
• CPC Class Codes: Y10S 322/05 Hall effects elements

Abstract

An arrangement for the contactless transmission of control commands from a stationary part to a rotating part of an electrical machine in which a ring shaped signal receiving member coupled to the shaft of the machine has installed therein a plurality of Hall effect generators, which ring and Hall effect generators rotate within the gap of a stationary electromagnet to which is provided a control current, whereby the control current varies the magnetic field, which variation is picked up by the Hall effect generators, the resulting Hall generator voltages then amplified and provided to control elements within the rotating portion of the electric machine.

Claims

1. Apparatus for the contactless transmission of control commands from a stationary part to a rotating part of an electric machine, which machine is controlled through the use of rotating thyristors comprising:

a. a ring shaped anti-magnetic signal receiving member adapted to be coupled to the machine shaft and having installed, at the circumference of the ring, a plurality of Hall effect generators;

b. a stationary electromagnet having poles forming an air gap located so that said signal receiving member will rotate therein; and

c. means to provide a control signal to said electromagnet.

2. The invention according to claim 1 wherein said electric machine is a synchronous generator without slip rings and with an external pole exciter.

3. The invention according to claim 1 wherein said electromagnet is fed with a control current from a co-rotating current source.

4. The invention according to claim 3 wherein a control signal transmitter is coupled to said electromagnet to develop in the air gap a magnetic field for the Hall effect generators and wherein the resulting Hall generator voltages developed are coupled through amplifiers mounted for rotation with the shaft to control means for the control elements to be controlled.

5. The invention according to claim 1 wherein each the Hall effect generators is contained between two collector strips of mu metal inserted in upper and lower circular grooves in said ring shaped signal receiving member with an air gap established between each Hall effect generator and its associated collector strips and those of adjacent Hall effect generators and collector strips.

6. The invention according to claim 5 wherein said collector strips are laminated.

7. The invention according to claim 5 wherein said collector strips comprise sections of wires cast into the circular grooves.

8. The invention according to claim 1 wherein said signal receiving member is made of one of brass and aluminum and has one of a T and L shaped profile.

9. The invention according to claim 1 wherein the control command for the control elements to be controlled is provided from a signal transmitter which is coupled through a modulator and power amplifier to said stationary electromagnet to thereby establish the magnetic field in which the Hall effect generators operate.

10. The invention according to claim 1 wherein the Hall voltage outputs developed by each of said plurality of Hall effect generators is provided through an amplifier to a common summing amplifier, and further including a demodulator coupled to the output of said summing amplifier said demodulator providing its output to a control set for controlling the control elements.

11. The invention according to claim 1 wherein said Hall effect generators are connected in series with each other and a control voltage supply.