Answer Posted / kj

Most of the world including India and the USA use AC power.
the main reason for this is the ease with which the
voltages can be changed using transformers. The 2
differences are that USA uses power of 120 volts and 60 Hz
but it is still AC.

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I have a drawing of a wound rotor induction motor for a crane. This crane motor has 5 forward speeds & 5 reverse speed implemented of course with different amount of resistance for each speed setting selected. What has got me scratching around is the fact that 8 of the 10 speed selections switch in uneven (unbalanced) amounts of resistances on each of the 3 connections to the motor's rotor.Can this be possible? I would have assumed this would produce unbalanced rotor currents and therefore vibration in the motor. I would greatly appreciate anyone's comments on this. Many thanks, Confused.

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