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#1
02-17-2011, 04:47 PM
 john_g Silver Member Join Date: Jul 2008 Posts: 518
Amplidynes

Hi
I came across this device, which seems to give some pointers related to a few of the ongoing threads:

Amplidynes

AMPLIDYNES

Amplidynes are special-purpose dc generators. They supply large dc currents, precisely controlled, to the large dc motors used to drive heavy physical loads, such as gun turrets and missile launchers.

The amplidyne is really a motor and a generator. It consists of a constant-speed ac motor (the prime mover) mechanically coupled to a dc generator, which is wired to function as a high-gain amplifier (an amplifier is a device in which a small input voltage can control a large current source). For instance, in a normal dc generator, a small dc voltage applied to the field windings is able to control the output of the generator. In a typical generator, a change in voltage from 0-volt dc to 3-volts dc applied to the field winding may cause the generator output to vary from 0-volt dc to 300-volts dc. If the 3 volts applied to the field winding is considered an input, and the 300 volts taken from the brushes is an output, there is a gain of 100. Gain is expressed as the ratio of output to input:

In this case 300 V &divide; 3 V = 100. This means that the 3 volts output is 100 times larger than the input.

The following paragraphs explain how gain is achieved in a typical dc generator and how the modifications making the generator an amplidyne increase the gain to as high as 10,000.

Some info here as well, with good section on motors and generators:

http://jricher.com/NEETS/14177.pdf

Regards

John
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#2
08-05-2014, 03:18 AM
 Danny B Platinum Member Join Date: Oct 2012 Location: L.A. Ca. Posts: 4,096
Amplidyne

Here is a vid on the amplidyne. They keep talking amps and not watts.
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#3
09-14-2018, 04:41 PM
 thaelin Member Join Date: Aug 2008 Posts: 80
I know this is a thread from '14 but really do need to bring this into prospective of what a true Amplidyne is. It requires a motor and a Genset. In reality, it is the extra brushes and extra coils added that make it unique.

This does require more view. Getting the right balance of added coils is the trick. Does it make this gen easier to turn over? An open frame build will be a necessary item to test different sizes of coils.

Something to play with

thay
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