Owen Duffy wrote:
Isn't hopping onto the rotor (assuming synchronous speed) to make your
observations called moving from the time domain to the frequency domain,
and all the mathematical shortcuts are only valid if all quantities share
the same angular velocity (or frequency), implying sinusoidal waveform.

Ever wonder which direction, clockwise or counter-clockwise,
a standing-wave phasor is rotating?
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73, Cecil http://www.w5dxp.com