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"would an SDS work?"

Posted by Mark Kelly (M) on April 12, 2007 at 15:28:26

In Reply to: I've had similar frustration on this Empire belt issue... posted by Supercool! on April 11, 2007 at 22:53:21:

No. The Papst motor chews about 30 watts, ideally they require a dedicated three phase motor supply.

You can DIY a reasonably accurate one fairly cheaply - the last one I built cost about $300 in parts IIRC and achieved better accuracy than the 100ppm which SDS claims but required a good deal of careful building to achieve this. Several inmates are collectively building a new design which will be somewhat more expensive but much more accurate. If it works as well as I think it will I'm thinking of commercialising it, I'm also toying with a cheaper version at around the 100 ppm mark.

The basic idea is to generate a very accurate low voltage quadrature pair then convert the quadrature pair to three phase, amplify the three phases using audio grade amplifiers and then step up to mains voltage with three transformers. If the quadrature pair is generated using one of the new DDS chips the accuracy is dependent only on the clock supply to the chip which can be very accurate indeed (1 ppb or better). The cheap version uses a cheap crystal clock and a simple CMOS waveform generator I designed myself.

Mark Kelly

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