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Discussion Starter #1
Hey guys it seems the more I read the more confusing it is on motors.

Like a smaller motor is better because it has a higher rpm? What affects the motors rpm? Like between a 9” and a 11” motor? Also are you exceeding the rpm rating?


I saw this 15hp 230v 3phase ac motor at the scrapyard today. Says it says it’s rated for 1700rpm. This motor is massive, I would estimate 15” diameter and 20” long.

How is this only rated at 15hp when it’s probably double the size of a 9” motor? And since I’m assuming this isn’t going to be a good canidate for an ev car, what should I be looking for in an ac motor that would make it a good canidate?
 

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Discussion Starter #3
Thanks I’ll give them a read, the more info the better. From what I’ve read ac motors are better because speed depends on frequency not voltage, so you aren’t limited like a brushed dc motor. I’m an electrician so I have a basic understanding of motors but we don’t repair them, it’s cheaper to throw them out and get a new one, so I’m trying to see if it’s worthwile to get a scrapped one and rebuild it for an ev car.
 
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