Body
Hi Warren,
The inductive reactance of the no load transformer is increasing proportionally with the frequency as this is actually just an inductor (i.e. there is only current through the primary coil when the secondary is open circuited). This means that to fully magnetize the core at double the designed frequency the input voltage must be doubled too. At half the frequency the primary voltage then must be halved to prevent saturating the core as the no load current is doubled. Another problem at higher frequency is the resistive loss from eddy currents in the core. To minimize this loss thinner lamination sheets are needed or a less electrical conductive magnetic conductor for the core material.
Regards
Ole
---In [email protected], <schoonersolsticemoon@...> wrote :
Norm and all Does anyone have a ball park idea of the frequency tolerance of a 60 hz transformer doing other frequencies? How far can one stretch a 60 hz transformer before it smokes? Like 25hz to 400hz?
Cheers Warren
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On Sun, 3 Mar 2019 at 7:07 AM, Norman Wootan nwootan@... [EVGRAY]
<[email protected]> wrote:
http://www.dartmouth.edu/ http://www.dartmouth.edu/~sshepherd/research/Shielding/
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Pretty good review of problem, Ole.