Identifying a squirrel cage rotor
How can i identify a rotor interms of number of poles, frame size etc if its not marked. l want to match a rotors to their stators but the challenge is there are no details on the rotors. Are there any physical characteristics that i can see to know the number of poles or frame size of these rotors?
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lalIn choosing a rotor there is no need to consider the number of poles in a squirrel cage, because the rotor acts as a short circuited path for the induced current to flow.
So i think the important factors are the rating of the motor and the dimensions. A high rated motor should have the rotor conductors which are able to withstand high current. That means larger conductors for higher rating. Another factor worth considering is the rotor diameter. As rating increases, this diameter increases too for two similar constructions. The airgap length of inductions motors are so small that the inside diameter of the stator is only a notch higher than the rotor diameter. So I guess the rotors can be identified my measuring the inside diameter of the stators. Do share if you found some other way to find it out.
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