motor rotor material

[Kash2013]

I have a question. Can we accept Motor rotor material as aluminum instead of copper? If we cannot, what is the technical reason?

Thanks.

 

[waross]

Motor rotor material as aluminum instead of copper?

Cast aluminum is common in smaller sizes of Squirrel Cage Induction Motors.
I guess the answer is;
"Yes".

 

[Gr8blu]

Resistivity of copper (and copper alloys) and aluminum are all different. The resistivity of the circuit has an effect on the development of torque and therefore the ability to accelerate a mechanical load. More resistance means more (starting) torque - but a flatter torque capability curve.

Aluminum has less mass for a given volume, so something built with aluminum will be "lighter" than a similar copper-based construction. This typically means that the aluminum construction will use a different cross-section of material (and, in the case of rotor bars, possibly a different shape entirely) to achieve sufficient mass for thermal absorption.

It is not uncommon for physically small squirrel cage induction machines to use cast aluminum rotors (including both bars and end rings). Some end users may specify one material over another based on the reactivity of the rotor material to the local air chemistry.

Bottom line: aluminum rotors are used. Over a certain physical size or in specific industrial applications, a copper-based winding would prove more advantageous in the long term.