I used only three rods, in addition to steel. But to my surprise it worked, I did not have the equipment or time to carry out the tests, the only thing I've done is to check how quickly rotates counter when directly connected an electric kettle, and through transformer, shown in the photo below.
Scheme modeled on the link below.
[VIDEO]https://www.youtube.com/watch?v=lUtRFSqj504[/VIDEO]

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