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Estimation of Motor HP

PostPosted: Tue Nov 30, 2021 12:36 am
by clivep
I have a smallish DC motor made by Siba. It's about the size of an old fashioned car dynamo and is a 4 pole series wound machine. Spec plate says Type TM 3008E 12/24 volts. I've put it on a power supply. at 12 volts it runs at 4900 rpm and at 24 volts 8600 rpm both unloaded. It draws 8 amps at both voltages.

Without putting a physical load on it, is there any way to estimate the HP rating of the motor?

I'm guessing 1/4 to 1/2 HP. It's about 30 years old and unused but I can find no info on the internet about it.

Any thoughts welcome.