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How to Determine Voltage and RPM of an Unknown DC Motor?

I am a DIY enthusiast and due to expensive range of materials i am currently looking for some used dc motors. Some days ago i bought some used dc motors but no information was visible on them due to that i am unable to determine their voltage and rpm. Did their any easiest way to check voltage and rpm of these dc motors through any meter/ instrument? More so did tachometer really work for this purpose to check rpm of my dc motor and a mini volt meter to check voltage of motor?


randofo2 months ago

I am not sure how to check for voltage. A tachometer I suppose would give you the RPM. It's probably best to just buy one with a known voltage and RPM if that is important to what you are doing.

Keep in mind RPM changes as the voltage changes.