We used a dc drive to run the rotor - then used the (IIRC) existing
large adjustable resistor to drop the field as you increased the speed..
(from simple rectified dc). This is still a manual lathe. I
think though it would be pretty easy to use 2 dc drives - one for the
rotor and one for the field. (seems easy enough to control it from hal..)
Yes - the dc motor has very nice low end torque..
sam
On 4/29/2013 9:48 AM, andy pugh wrote:
> On 29 April 2013 15:16, John Kasunich <[email protected]> wrote:
>
>> Discarding the DC motor will almost certainly mean
>> a significant performance penalty. Keeping the DC
>> motor and driving it with either a DC drive, or the
>> existing motor-generator set, will keep the performance.
> Good point, I didn't think of that.
>
> There are a couple of 2hp DC drives on eBay for around the $200 mark.
> I didn't find any 3HP ones, though there are several "Unidrive" units
> on there, which can drive pretty much anything.
>
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