Below is an impedance chart of a ~1.9mh inductor. Blue is reactance, Yellow is phase. This was measured using Speaker Workshop (passive component measurement feature).
Typically when I measure a capacitor or a resistor I get a dead straight line for phase (yellow) at 0° for a resistor and -90° for a capacitor. But when I measure an inductor the phase gets skewed like shown in the chart. It starts shifting towards 0 in the low frequency range. Why is that ? My guess is that it could be because of the DCR of the inductor.
I get similar results when I measure high value (1000uf+) capacitors. The phase starts shifting towards 0 in the high frequency range. Again, ESR ?
What do you guys think of an explanation for this ?
An externally hosted image should be here but it was not working when we last tested it.
Typically when I measure a capacitor or a resistor I get a dead straight line for phase (yellow) at 0° for a resistor and -90° for a capacitor. But when I measure an inductor the phase gets skewed like shown in the chart. It starts shifting towards 0 in the low frequency range. Why is that ? My guess is that it could be because of the DCR of the inductor.
I get similar results when I measure high value (1000uf+) capacitors. The phase starts shifting towards 0 in the high frequency range. Again, ESR ?
What do you guys think of an explanation for this ?
flatsoongsc said:
so it IS about dcr/esr, right ?sreten said:Hi,
Think about it. What would a speaker inductor that could
maintain 90 degrees phase shift at 10 Hz look like ?
How low would its DCR need to be ? How big would the
core need to be for the current from your drive voltage ?
/sreten.
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