[ARC5] Dynamotor Regulation

[Michael Hanz]

Amen!  They're rated at 50 amps @28v, or 100 amps @14v continuous, but 
mine have never failed to start the largest dynamotor I've ever need to 
power up, including a big three phase 100 amp input rating 400Hz 
aircraft inverter that turned out to be a real screamer.  I think I lost 
some hearing in that test even though it was unloaded. (I decided I did 
not need that in the radio shack for obvious reasons...)

The 1104's use of a saturable core reactor with a magnetic amplifier 
configuration eliminates all the crowbar problems encountered with later 
regulated solid state supplies.  It just grunts softly and carries the 
load.  The original -A model actually used copper oxide rectifiers - 
that's how far back the technology goes.  The last (-C) model uses ten 
30 amp IN3660 diodes to divide up the load to separate windings on the 
power transformer.  It's pretty much bullet-proof.

Against my better judgement, I recently purchased another one on ebay - 
mostly because it was nearby and I could pick it up for a couple gallons 
of gas.  Shipping for its 151 pound weight is fairly prohibitive these days.

- Mike  KC4TOS

On 7/29/2017 4:22 PM, WA5CAB--- via ARC5 wrote:
> You need to find a PP-1104(*). :-)  Mine never met a 12 or 24 V 
> dynamotor it didn't love.
>
> In a message dated 07/29/2017 09:10:59 AM Central Daylight Time, 
> jeepp at comcast.net writes:
>> For what it may be worth, I use a PP-4763A power supply, well known for
>> its ability to trip at 1ma over 50 amps....hi!  I use a parallel battery
>> and a .25 ohm 200w watt resistor as a manual operated output soft-start
>> for the PP-4763.   So far no issues with either the DY-17A or the PE-73C
>> dynamotors.
>>
>> Jeep - K3HVG
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)

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