Re: DC Motor Control: H-Bridge +5A, 48v

On Tue, 10 May 2005 13:08:49 -0400, R Adsett
<radsett@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:


>I once did the SW for a variant that used a pair of controllers to
>control a series wound traction motor in an H-bridge configuration. We
>had the current oscillating at about +-700A IIRC with the motor reversing
>direction every few seconds. I could swear I could feel the magnetic
>field off of that sucker. Twitching 00 cable does make for an intriguing
>sight.

That reminds me of another thing. Way back when I started at the
forklift company in 1994, the engineering department was a bit
lacking in equipment. So for a while, we had to use an old WYSE
terminal for debugging. The forklift had a serial port on the
controller board and you could plug in a terminal or computer
with terminal program, and look at things like all the sensor
readings, examine memory contents, etc.

When we would run the lift motor at about half PWM, which
resulted in maybe 250 amps or so, the image on the CRT of that
old WYSE terminal would shake up and down about 1/4 inch, even
though it was on a table a couple feet away.


.

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