I agree with the info above.
5 wires probably means its got different speeds or some sort of invertor setup powering it.
Washing machine motors is what's used for bench grinders. They have the size to keep the momentum as well as the brackets (on the older ones that have a saddle for the ruber ring to fit into).
I have one on a small concrete mixer ( morter mixer).
There may be more than 3 wires on it. Be carefull, once the motors up to top speed, it trips a switch inside it and one of those wires becomes a live wire, with power runing out of it.
Get a electricin to check it or something. We use 240 v ac in NZ, so there's differences.
Just be carefull that you cannot short one soon to be live wire onto something like a metal bench like I did.....
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