This is DIY universal AC motor with tacho sensor speed controller. This system is called closed loop. This controller can keep RPM and torque at any our set speed. Even on load. It's possible to control any AC brushed mototor. I.e. washing mashine, drill, angle grinder, router, etc. For motors, where is no tacho sensor we'll need to add it. It could be hall or induction sensor. There is a lot of tacho sensor projects on internet.
Full projet details:
https://www.hackster.io/saulius-bandz...