Increasing drive output from 60 Hz to 120 Hz... transformer losses?
Increasing drive output from 60 Hz to 120 Hz... transformer losses?
(OP)
If I increase the output frequency on a given drive from 60Hz on the output to 120Hz, what can I expect as far as output-side transformer loss changes? The output voltage would remain the same. I am pretty sure winding losses will go up, but based on practical experience, by what factor? I suspect that halving the volts/hertz ratio will drop the flux density by an amount that will negate any increases in core eddy and hysteresis losses and give good no-load performance. I am concerned about the cooling on the unit under a loaded condition however. Any help would be greatly appreciated!





RE: Increasing drive output from 60 Hz to 120 Hz... transformer losses?
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If we learn from our mistakes I'm getting a great education!
RE: Increasing drive output from 60 Hz to 120 Hz... transformer losses?
RE: Increasing drive output from 60 Hz to 120 Hz... transformer losses?
The mmf [E=U-Zp*I1] will decrease [2-3% I think], as Zp will raise [Zp=Rp+jXp] Xp=Lp*2*pi()*f will be doubled.
E=B*S*w1*2*pi()*f and as Scotty said if f2=2*f1 then B2=B1/2.
In this case hysterezis losses =n*f*B^1.6 will decrease B2^1.6=B1^1.6/2^1.6=B1^1.6/3 then:
hysterezis losses2= hysterezis losses1*2/3[67%]
The eddy current will stay unchanged [approx.].As you said already, no significant change will be in copper losses due to
skin effect.
The big change will be in voltage drop across the transformer and the secondary voltage could be 4-5% less.