[modeleng] Re: Electric Traction Problems

Patrick said:
>90 amps, or 90 milli-amps
The priciple is the same. Yes, you need to get into some industrial 
power electronics,if need be, you have to do some parallel switching of 
power components, and indeed you need more than a little multi meter, 
bought for 10£<
Very true, but the point I was managing not to make very well is that at 
these sort of current levels, this is not a project for the newcomer to 
power control.electronics. High power rlrctronicsd is interesting in 
itself, and the related mechanical engineering problems are of interest, 
too  -  the biggest things I've ever worked on were a 750kW output 
broadcast transmitter, a 10MW peak output radar, and the second 
transmitter to go in at Goonhilly, which took about 75kW of DC for 10kW of 
RF. These days, I'm at the other end of the spectrum, where 1.8volts at 
5mA is high power!

But I do feel that it's a bit too easy to under estimate the problems in 
building (and testing) such a controller if you don't have some experience 
in the field.

Peter Chadwick
Swindon
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