---Reply to email---
Good morning, Henry. Thanks for your interest. K1,2, and 3 are large double-throw relays used to re-configure between the Wye and Delta modes. In my post you can see I used Double-Poll Double-Throw relays. I wired so both polls are parallel - doubling current capabilities of the contacts (each contact rated for 30amps totalling 60amps per relay). K4 is a small 5volt(?) relay on the proposed control board in the power-shack. The sensor winding will generate a voltage proportional to turbine RPM, the Pot fine tunes the point of delta engagement. Hopefully the hysteresis in the small relay will buffer momentary drops in RPM/wind speed.
I wound the sensor winding in tandem when winding the two-in-hand coil. The 24awg does not increase the size of the completed coil much, as its diameter nicely fills the voids between the 14awg wires, (therefore, the sensor winding is embedded). Only one coil has this winding, and it does not matter where you place it in the mold, as it does not have an electrical connection to the main phases. I mounted this coil at the bottom of my stator as there was no other contact-lugs there.
