Interesting paper.
http://opiod.01www.com/asa_2005/rcl_.../126_Gross.pdf

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How wrong you are! In fact magnetic amplifiers might make a comeback and magnetism itself is far from being fully understood.

"The magnetic amplifier is important to many phases of naval engineering because it provides a rugged, trouble-free device that has many applications aboard ship and in aircraft. These applications include throttle controls on the main engines of ships; speed, frequency, voltage, current, and temperature controls on auxiliary equipment; and fire control, servomechanisms, and stabilizers for guns, radar, and sonar equipment."

http://www.tpub.com/content/neets/14.../14180_131.htm

 

hi,
As far as I am aware, they have never gone away..

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PIC tutorials:
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Thanks for that Mikebits. Kind of makes my point really.

Oh, and thanks for editing your previous post Chumly.
The email I got was:

I'm not sure why you felt the need for rudeness.
Yes, there is a lot of loss in AC power lines but if you read the link Mikebits posted you may understand why I was correct in what I said.

Larry

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Oh, and Edison later patented the electric chair in order to show the danger in AC transmission. Just thought you might like to know.

Larry

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Not really true - there was an ongoing battle between Edison and Westinghouse - one DC and one AC. Both were trying to prove the others system was the most dangerous - including various barbaric displays in the streets. The invention of the electric chair was just another stunt to try and discredit the rivel system.

There's even a film about it, which is quite interesting.

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I changed it as soon as I realized that I posted before I editing.

I most often start with putting down general thoughts (sometimes pretty wild!) then editing them, but in this case I copy-pasted without edits as I half-asleep. Naturally I changed it very shortly thereafter.


Nope you are still incorrect when you said "The reason AC is used is precisely because it has less loss........"

As discussed you do not understand AC Effective Resistance.

 

Here is the definition of the word comeback: "A return to formerly enjoyed status or prosperity" and in that context they are not as popular as they once were and my post has merit.

Understand that the word comeback does not infer that the concern in question has "gone away" as you suggest above.

As discussed I said "magnetic amplifiers might make a comeback" and yes they were more popular by default as the alternatives were fewer!

Wiki says and I concur:

In later years, improved vacuum tubes, followed by the transistor, would come into play for the production and regulation of high-power AC and radio waves. Recently, however, a resurgence in the interest and applications of the magnetic amplifier is resulting in new uses for this venerable technology.

At one time, magnetic amplifiers were considered as an alternative to vacuum tubes because of their rugged construction, high reliability, and lower working voltages. Consequently, vacuum tubes had a definite lifespan due to heater filaments that eventually burned out over time, or a loss of vacuum resulting in potentially-destructive arc-overs within the tube.

Magnetic amplifiers were used early on to control large, high-power alternators by turning them on and off for telegraphy or to vary the signal for voice modulation. However, the alternator's frequency limits were rather low to where a frequency multiplier had to be utilized to generate higher radio frequencies than the alternator was capable of producing. Even so, early magnetic amplifiers incorporating powdered-iron cores were incapable of producing radio frequencies above approximately 200 kHz. Other core materials, such as ferrite cores and oil-filled transformers, would have to be developed to allow the amplifier to produce higher frequencies.

http://en.wikipedia.org/wiki/Magneti...fiers_(history)

 

hi,
Thanks for the history lesson, but I was one of the engineers back in the 1950 and 60's working on industrial mag amp systems...

I have no need to read Wiki on this occasion.

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"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

 

Fair enough, do you thus think the definition of comeback and the subsequent viewpoint to be incorrect?

In any case, and outside of such silliness, if you have any info in regard to the topic at hand, I would be more than pleased to read it and respond in kind.

 

I would be thrilled if you could locate that as per YouTube or otherwise. In fact any videos on the pioneers of power distribution / power generation would be great!

Much thanks!

 

hi,
There is no silliness or confrontational intent.

But with ref to Mag Amps you are pushing on an open door.! I agree with you.
I cant say it any plainer than that.

My usage of 'comeback' is that 'something' that has gone out of fashion/use and is now coming back into use, as you have stated the Mag Amp is still in service, so how can something make a comeback if it hasn't gone out of usage.

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"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

 

hi,
I also saw that TV documentary.

__________________
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"Good enough is Perfect"

PIC tutorials:
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Bill's: www.blueroomelectronics.com/

 

Ah....because I use the word in the relative sense and not the absolute sense, as such my text indicates this context.

I can't be responsible should you wish to apply the word outside the context of my text! Well I could take said responsibility but I won't (insert punchline).

I'm off the Costco to buy some stuff......

 

That's what I said, basically.

Larry

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