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On Fri, Jun 08, 2007 at 06:08:33PM -0600, Dwayne Reid wrote:
> I think that you will find that trying to use a 6 Hz sine or square 
> wave signal to not work very well because of core saturation problems.
> 
> However, you might try using narrow pulses (a few ms wide) pulses 
> alternating at a 6 Hz rate.
> 
> Half-wave rectifier running directly from power line, small reservoir 
> cap, H-bridge driving motor.
> 
> For that matter, I've envisioning the possibility of a really simple 
> H-bridge with 2 small reservoir caps (one for each side of the motor 
> winding) and treating the whole thing like a capacitive discharge 
> supply.  Maybe . . .  Have to think it over.
> 
> Bottom line: think in terms of narrow pulses alternating at your 
> desired rate.  I think its got a good chance of working just fine.

Thanks for the input. Sounds like your idea could work, but to generate
those pulses I might as well have a microprocessor and at that point you
might as well just use the on/off scheme. 

Still, I can see pulses being cheaper and smaller in some cases, a pulse
generating circuit would likely take up less space than a solid state
relay module. A key advantage would be that the circuit could run off a
low voltage wall wart, and therefore avoid having AC line voltage in the
project. (not that ms pulses are completely safe either)

- -- 
http://petertodd.org
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