Aluminum Wired Fan vs. Copper Wired Fan

the "watts "rating here is a measure of power consumption to run this device, so the power draw on both can be identical. But your aluminum wire will actually be warmer. aluminum will indeed carry electricity, it just doest do it as well as the copper. Aluminum also has undesirable expansion and cooling rates that can cause connection issues including fires. save time and stick with what works, go copper.

You are overlooking a simple electrical principle of AC motors. Inductive impedance.

Thats what determines how many amps your alternating current motor will draw not the actual resistance of the wire itself.

To get 75 watts to flow through the motor at 220 VAC the electrical inductive impedance of the coils would be producing an equivalent resistance of 645 ohms.

However that actual resistance of the windings could be only 50 - 100 ohms themselves which if the motor manufacturer simply stepped up his wire cross sectional area by 20% and went with just a few less turns of wire one each coil he could have easily fit aluminum windings in the same motor core and got the same working mechanical power output without sacrificing any motor efficiency or performance.

Apart from others' relevant comments, is the 75W the motor output power or the electrical power drawn? Most domestic appliances quote the power drawn (unlike industrial motors where the rated power is the shaft output power).

But if your 75W is the motor output power (= power needed to drive the fan), the electrical input power could be higher for the one with aluminium windings.

Mechanical vs. electrical difference = aluminum wire WEIGHS less than copper wire, so the aluminum wound motor has LESS inertia to sling around, which ultimately (if properly & cleverly designed) could explain the answer to your question: *why & how* is it possible they have idential wattage numbers?

The stator with the windings is mostly standing still, only the rotor turns. I don't see how the weight of a non moving stator can increase the inertia of a turning rotor…

But there are conductors in both the rotor and the stator. I don't know whether there's any reason why they're both same material, or can be one of each. Perhaps somebody will enlighten me.

It means, technically there is no problem in using of aluminum wires instead of copper (wattage can be same) but major difference is that the aluminum winding can produce more heat as compare with copper. But I think this extra heat could be caused by ruining of winding too early. Am I correct?