Thread: How do you slow down an electric motor?

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sounds like the same belt sanded like i have .i do not run the disc sander any more after having the same thing happen to me .there was a sound coming off the sanding disc look over and BANG 80grit sanding disc to the face hit me so hard it look the the safety glasses off my face hit me in the lip and teeth so hard i was thinking i open my lip up. it was stringing could not tell at first . but i did not do any thing to my good looksbut i did get very sick looking at the safety glasses .if i did not have them on i would not have the use of that eye . you can not slow it down to much with out hurting the tq of the sander the ac motor needs to run at max rpm for tq if you cut it down with a speed controll it may not work as good . i have a ac motor machine with a frequency drive on it did not work that hot step it down with pulleys .it still needs more tq .with a dc motors work better with a controller and you can turn up the tq at low rpm i have used the baldor and the danfoss drives