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From: "Richard Everett"
Subject: large (5HP) DC motor controller design issues
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Fri, 27 Sep 2002 18:46:17 GMT
NNTP-Posting-Date: Fri, 27 Sep 2002 14:46:17 EDT
I would like to build a somewhat simple PWM controller for a largish DC
brush motor (5HP). This is a shunt wound motor, with a 180V armature
(guessing about 24 amps) and a 200V field (at 1 or 2 amps). I can live
without field weakening if needed.
One big problem is that I need to be able to control the motor position. It
is the spindle motor in a cnc mill I picked up cheap because the spindle
drive was shot ($7500 to replace)...the cnc mill has a tool changer and so
the spindle has to stop in a certain position for a notch in the spindle
taper to line up with a notch in the tool holder when changing tools.
Ideally, I would like to build a solid state reversing drive (hbridge made
up of IBGT devices, or mosfets) with quadrature encoder feedback. I have
built discrete h-bridges for small motors and steppers, but have never
tackled something of this power. I am worried about things like voltage
spikes and inrush currents.
A fairly exhaustive search of past posts has not yielded much information in
larger DC motor control...any articles or sources of information would be
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