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Re: Canarsie CBTC

Posted by Jeff H. on Tue Jun 14 21:13:06 2005, in response to Re: Canarsie CBTC, posted by Stephen Bauman on Tue Jun 14 16:48:05 2005.

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I'm trying to picture the R142/R143 traction motors. They have
the 3 heavy phase conductor leads coming out, but I don't recall
a tach output. I could be wrong though.

As you said, there are other ways. Control of the torque and speed
of an induction motor doesn't require tach feedback. It can be
done easily through current sensing. Vector (position) control
is tougher to do this way (although reasonably practical if you
have an accurate model of the motor's characteristics).

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