On Tuesday, March 7, 2023 at 4:10:26 AM UTC+11, boB wrote:
> On Mon, 6 Mar 2023 01:35:41 -0800 (PST), Anthony William Sloman
> <bill....@ieee.org> wrote:
> >On Monday, March 6, 2023 at 4:09:22?AM UTC+11, John Larkin wrote:
> >> On Sat, 04 Mar 2023 23:36:56 -0700, boB <b...@K7IQ.com> wrote:
> >> >On Fri, 3 Mar 2023 20:13:46 -0800 (PST), Anthony William Sloman <bill.....@ieee.org> wrote:
> >> >>On Saturday, March 4, 2023 at 2:04:20?PM UTC+11, John Larkin wrote:
> >> >>> On Sat, 04 Mar 2023 01:23:17 -0000, "Commander Kinsey" <C...@nospam.com> wrote:
> >> >>> >On Sun, 26 Feb 2023 16:13:19 -0000, John Larkin <jla...@highlandsnipmetechnology.com> wrote:
> >> >>> >> On Sun, 26 Feb 2023 09:45:26 -0000, "Commander Kinsey" <C...@nospam.com> wrote:
> >
> >><snip>
> >
> >> >>> The reason that loading a transformer doesn't make it saturate is
> >> >>> because the primary excitation flux and the flux from the secondary
> >> >>> load current cancel. Loading a transformer reduces the core flux.
> >> >>
> >> >>Not exactly. The core flux has to keep increasing to generate the voltage the drives the current into the external load. Because you drive transformers with AC the voltage eventually reverses, ideally before you saturate the core.
> >> >
> >> >Bill, I think this assumes that the voltage is regulated with
> >> >feedback.
> >> >
> >> >Driving the transformer with, say, just grid voltage would do what JL
> >> >is talking about because the IR drop when loaded, reduces the
> >> >volt-seconds imposed on the core which is what causes saturation.
> >> Yes. Shorting the secondary will drop the core flux about in half.
> >> >
> >> >Pretty sure that's it anyway.
> >>
> >> Sloman has lectured us hundreds of times about how we should design and not buy transformers, so it's hilarious that he doesn't understand the basics.
> >
> >Joh Larkin's reading comprehension is down there with Flyguys. I'm all in favour of buying off-shelf transformers if you can find one to do the job..
> >
> >The problem is that you rarely can.
> >
> >As to why he thinks I don't understand the basics of transformer design, the answer has to be that he doesn't, and thinks that boB does, which is hilarious.
>
> That's OK, Bill. But at least we know what works for transformer design in a product.

In the sense that they haven't blown up recently. John Larkin's problem is that he really doesn't want to design a transfomer to a do a specific job or go to the trouble of getting it made, and doesn't want to admit that he is avoiding a task that he finds difficult.

> There may be some confusion between inductor magnetics and transformer magnetics design going on down there. It's all the same thing in the end.

Obviously, but only up to a point.
> Try operating a transformer designed for 50/60 Hz operation with = decreasing frequency and watch the magnetizing current rise as it starts to go into saturation. Lower frequency means higher volt-seconds.

Obviously.
> You have to reduce the excitation voltage as you decrease the frequency to keep the V-S from increasing and saturating the core in a transformer.

That's one option. If you feel the need to do the experiment, you can't have grasped the theory
--
Bill Sloman, Sydney