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From: email@example.com (Bill Allison)
Subject: Re: Help - Power mosfets - difficult load
Date: 25 Oct 2002 02:40:56 -0700
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: 25 Oct 2002 09:40:56 GMT
Thanks for your encouragement, and tips. I looked at smaller motors
but none are sufficiently powerful. Car starter motors are pretty much
the norm for this job (http://www.monkeytumble.com/winchdoc/). I will
be able to start off gently though by wiring some resistance in series
with the motor.
firstname.lastname@example.org (John Crighton) wrote in message news:<email@example.com>...
> On 24 Oct 2002 00:37:20 -0700, firstname.lastname@example.org (Bill Allison)
> >To all - this has generated such interest and controversy that I feel
> >obliged, once construction is complete and assuming (!!??) success, to
> >post oscillograms somewhere (somebody suggest where?) to quantify just
> >how much of a problem operating at 50Hz turned out to be. So keep an
> >eye open for this thread re-awakening in a few weeks.
> Hello Bill,
> I wish you good luck in your project and look forward to
> hearing about the results of your efforts.
> Have you had a look at the 4 QD website on motor control?
> There is lots of info there.
> You'll find the site using a Google search quite easily.
> A work mate of mine repaired the bosse's wife's
> motorised golf caddy. It had a small car battery
> but I do recall the motor was not a car starter motor.
> He replaced the whole control unit with his own
> scratch built 555 and two paralled 20 amp fets.
> I do recall the lady complaining that she had to run after
> the golf caddy occassionally when she was learning to
> use the new speed control knob. Heh heh heh.......
> If you find the starter motor that you have is a bit too strong
> perhaps have a look at golf caddy or golf buggy motors
> or even a smaller stater motor from a small 3 cylinder car.
> Suzuki 540cc, Daihatsu 650cc etc. About a fiver in your
> money from the car wrecking/breakers yard.
> Maybe work up gradually using parralled cheap fets on
> smaller motors, gradually getting bigger, rather than risk
> popping an expensive device on the first swich on with
> your big starter motor. That would be my approach but
> I am sure you know all that already.
> Keep us informed Bill,
> John Crighton
> Hornsby Heights
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