Controlling the Speed on a 240VAC Industrial Fan: Suggestions please
I have acquired an old "Airspeed" Industrial air circulator or fan, which stands on a pedestal. It still works, but at only one, fairly fast speed and in one fixed position. As a project, I am stripping it down and restoring it, while altering the overall look to something more in tune with a Steampunk aesthetic. As part of this I am adding a brass worm-drive which will enable me to alter the angle of the fan plus motor assembly on the pole to which it's attached. I would also like to be able to adjust the speed, either continuously, or using set points ( slow, medium, fast etc.). The motor appears to be single phase and connects directly to mains 240V AC supply. There are no electronics at all in the current construction - I would guess that the unit dates to the 1950s or 60s? Can any one suggest a safe and reasonably simple way to set up a speed control system?
All suggestions welcome, however banal - the more simply outlined the better. If you know of an electromechanical means of doing this, so much the better.
Regards and thanks