Moderators: Dave Moll, Steve Anderson
Steve Anderson wrote:One suggestion is to not feed the motor with quadrature square-waves but quadrature sine waves, this should smooth things out at the expense of a bit more complexity...and heat dissipation.
gary wrote:OTOH Steve, if you turned your mighty talents to developing a suitable (read simple and inexpensive) push-pull amplifier driver it would have many applications in NBTV - cheap synchronous motors for all!
Steve Anderson wrote:Hi Harry, if you wanna have a bash at wire recording I have uploaded a book into the 'Resources' section of this forum under the thread "Tape and Wire audio recording". It should help you with some of the pitfalls to be avoided. It's from 1952 by M.L.Quartermaine entitled, "Magnetic recording, wire & tape".
Being that old the generic circuits are all tube/valve based but should be translatable into semiconductor use.
I'm a bit wary at your use of a stepper-motor though, it could give you a severe dose of the 'flutters', as in wow & flutter from record turntables. I guess it depends on the step size and speed. Some inertia may help.
One suggestion is to not feed the motor with quadrature square-waves but quadrature sine waves, this should smooth things out at the expense of a bit more complexity...and heat dissipation.
[/quote]Don't forget to have your Four and Sixpence ready (front cover).
gary wrote:Ah that's the easy way out. Actually the problem there is that you need a dual power supply to avoid whopping big caps or a transformer on the output.
gary wrote:but what is needed is a kind of H-Bridge power amplifier - should be possible.
gary wrote:But I still see the use of steppers as synchronous motors as a great opportunity for NBTV. Definitely worth persevering with and surprisingly little has been done in that area.
gary wrote:In reference to what Steve and I have been saying the following circuit is all you would need for the speed calculation I have given.
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