Any of the older or even kind of newer(not withing the last 20 years or so) on industrial machines with a clutch used induction motors, They slipped the clutch, controlled by your knee, to change the speed of sewing, not a foot rheostat. The real newer ones use a BLDC motor and the same knee operated lever for speed..Many of the older machines (an some current ones!) used a Universal motor with simple variable resistance pedal.
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by Aaron Carman