Contactless inductive current collectors for investigating loads in rotating components

Conclusions

• 1. For measuring small deformations it is advantageous to have current collectors with carbonyl iron cores, since they can raise the signal obtained from the transducer (U_out/U_in>1), especially when amplifiers 8ANCh-7m are used. Moreover, they are cheaper and simpler to make than current collectors with alsifer or ferrite cores.

• 2. For measuring large deformations it is advisable to use current collectors with low-carbon steel cores. They are simple and inexpensive to make. Current collectors with steel 3 cores were also tested. Their characteristics hardly differed from those of current collectors with steel 20 cores.

Repeated testing of the instruments has established that variations in the ratio U_out/U_in with frequency changes do not produce noticeable changes in the recording scale of the tested process, since the amplifier carrier frequency is sufficiently stable. By using current collectors of different sizes, we have discovered that the inductive coupling rises with increasing core diameters.

Feed-through current collectors for testing the propeller shaft and the main gearbox shaft were provided with steel 20 cores.