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It's a LEM 500amp (900 amp peak) current transducer. It responds to a 90% of max current step in under 5 us. However, there will be no 90% current jump because I'm having the throttle control current rather than PWM duty, and I'll add sufficient ramping to slow di/dt to reasonable levels, and the mosfets I'll be using will be able to handle a current pulse that is much larger than 500 amps. More like 500 amps per mosfet for a single 100 us pulse according to the datasheet, which is a 5000 amp pulse.
Fran is the chief engineer at a company that designs brushless DC motors. He just volunteers his time on the EVTech list. I've never seen him receive any sort of help on there. He's very helpful though.
-Paul
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