The device I developed is a Mosfet swithching array. Actually its really just a bunch of dc solidstate relays wired in parallel. The trick in developing it was using an input signal of 4volts dc, to activate the solidstate relays, with fast switching speeds this is crucial. The star/delta switch is something different. But the stator wired in star, in my opinion, is the easy way when trying to convert a dual rotor machine into a traction motor. the "electronic commuter" would energize each of the dc phases at the right rotational position, using the mosfet array to switch power on to the phases. And water cooling could really benefit such an motor.
For wind gennys, its my opinion, cooling over the coils(in the stator) would be better for that application. Although construction could be a bit tedious. An alternative to linseed oil (boiled would be fine) is heat transfer fluid. This is a type of oil with a high flashpoint that would resist carbonizing.
I love this board :)
JW[ Parent ]
As you can most likely imagion the star/delta swithing for a genny could be acomplished in the same fashion. Most will point out that mechanical relays could accomplish the same task, and since the swithing frequency(in and out from star to delta) would be like once an hour or something like that, burning up the contact point's in the relay is not a major concern. But it is very hard to compete with a mosfet(solidstate dc relay) in terms of the power req'd to energise it. Compared to a mechanical relay(like a auto starter soleniod) mosfets use way less power to energize. Im very impressed, neat topic.
JW [ Parent ]
