21-05-2012, 08:07 AM
Yorkie mentioned the effect of broken strands in Litz wire and I came across this on an HMV radio. On some IFts resistance measurments clearly showed that some coils had 3-4 strands broken out of the 10. But when I made some Q measurements I couldnt, within the accuracy of the setup, measure any difference between them. The broken strands will still contribute by their capacitance to those that are unbroken.
Later, I typed into Goggle “Litz wire broken strands” expecting to get nothing of value. Within minutes I found an article “Litz Wire - The Effect of Broken Strands”, by member Alan Douglas from back in 1997. In the article he gives the percentage reduction in Q for broken strands of 3 and 7 strand wire. It really is quite astonishing that 4 broken strands, in 7 strand wire, only reduced the Q by 10% and the result was the same if the wires were broken at the inner or outer ends of the winding.
Gary
Later, I typed into Goggle “Litz wire broken strands” expecting to get nothing of value. Within minutes I found an article “Litz Wire - The Effect of Broken Strands”, by member Alan Douglas from back in 1997. In the article he gives the percentage reduction in Q for broken strands of 3 and 7 strand wire. It really is quite astonishing that 4 broken strands, in 7 strand wire, only reduced the Q by 10% and the result was the same if the wires were broken at the inner or outer ends of the winding.
Gary
