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aussie_bloke wrote:I am now wondering what was used in those sewing machine pedals to control the speed of the motor, was a high wattage potentiometer used or a mini variac?
Steve Anderson wrote:aussie_bloke wrote:I am now wondering what was used in those sewing machine pedals to control the speed of the motor, was a high wattage potentiometer used or a mini variac?
Usually a fairly high wattage rheostat of 20W or so rating, after an extended period on her machine my mother would complain about the heat. A variac would have been far too expensive and probably too large even if only 60W or so. I also remember the pedal itself weighed almost nothing, no transformer in there!
Today, I would guess a Triac, basically a light-dimmer.
As these were generally universal brushed motors (akin to earlier power-drill motors) I would think that running them off DC would be the way to go, controlling 50Hz for NBTV use seems laden with problems. But beware of the volts!
Steve A.
Nice motor you have there, certainly does look similar with the exception of the wiring arrangement.
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