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[DPRG] Inductors and PID

Subject: [DPRG] Inductors and PID
From: rten at new.metronet.com rten at new.metronet.com
Date: Thu Nov 14 10:04:01 CST 2002

I expect he was suggesting a high-current, small-inductance coil to kill
the fast leading edges. The motor's inductance is much higher -- and will
control it's own inrush, but that is on the far side of the brushes. I
don't quite understand his concern, but that is my guess.

On Thu, 14 Nov 2002, Kipton Moravec wrote:

> I was talking in passing to an older electrical engineer about my 10 amp 90V
> motor controller.
> I told him I was chopping and he said don't forget to add an inductor, or
> you will burn out your motor's brushes faster.
> I always thought the motor windings were a huge inductor, and why would I
> want more?  I put a 3000V 2000 pF capacitor on the motor output to help
> attenuate the spikes I think he is talking about.
> I have never seen it on h-bridges, or is it only an issue with the high
> voltage?   Can anyone point me to some sources?
> Kip
> Kipton Moravec  kip at kdream.com
> Custom Electronics Design and Manufacture
> http://www.kdream.com
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