Finding a motor

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Hi all, I’m a year 12 Design and Technology student currently aiming to create a ‘leslie speaker’- a speaker projecting into a fast spinning wooden baffle - from 40 to 500rpm- creating a cool sound, but the thing is that I have absolutely no clue of what I will specifically need for the rotary mechanism.

I have been recommended a geared 12V motor, producing about 5kg/cm of torque. - if this is appropriate, would anyone have a clue where I could find one / if it could be scrapped off a preexisting product?

I would also want a variable speed control mechanism but again, have absolutely no clue how to go about this haha.

Thank you all, any mentorship would be greatly appreciated,

Gus (:

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Hi Gus
Have a look at some of the Electronic Organs around. A lot of these are fitted with the “Leslie” speakers and you might get some ideas. I don’t know if it is just the baffle or the whole speaker that rotates but the idea is to alter the acoustic path length at a controllable rate. I think your 500RPM might be a bit high but then again I don’t know as I have not experimented with this.

I think that altering the acoustic path length would have a slight doppler effect and alter the pitch very slightly producing the sound these speakers are known for.
Cheers Bob

Could be an interesting exercise as you don’t want the mechanism making any noise.

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