3000W Chinese Gensets Info.
professor95 wrote: EDIT ADDED 45/5/2013- When this thread started in March of 2005, I never expected to see it survive this long or amass the quantity of information that has been shared here. In...
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I'm sturggling to understand this... Now, bear in mind, my dad has his own lawn and garden tool sales and repair shop. It's been YEARS, but I've seen the insides of an (admittedly) ancient generator. This is what my experience involves, and I guarantee that it wasn't as "high tech" as these newer generators.
I want to understand this, and I have a pretty good background in electronic components (as in transistors, resistors, etc.). So bear with me as I muddle my way through this.
To adjust the magnetic field, if memory serves, you either have to move the magnets closer/further to the windings, or you'd have to increase the strength of the magnet, right?
The magnets in those ancient generators I've had apart had fixed magnets that were rotated by the engine, and they couldn't be moved in relation to the windings (as an aside, in one generator, one of the magnets had gone out of position and had worn away some of the windings to the point where they broke. When that machine was started.... Ah, the sparks that flew!).
I'm thinking that in the Champion then, either the magnets are electromagnets, not permanent magnets, that are adjusted by the AVR.
-or-
The AVR's transistors, which you mentioned below, open/close off resistive pathways, which, by V=IR, keeps the voltage constant for a given current draw...
It's the latter that's right, right? Or am I missing the boat entirely here?
If it is the latter, and the transistors were "closed" to begin with, then power would have to be supplied to open them up. Which also works with your explanation below. As the motor winds down, the transistors close, which increases the resistance, which decreases the current, which drops the voltage...
Or am I completely confused?
cnsayre
I want to understand this, and I have a pretty good background in electronic components (as in transistors, resistors, etc.). So bear with me as I muddle my way through this.
generator-guy wrote:
First some background... For those of you who have no idea how an AVR works, it's really pretty simple. To produce AC power, the generator head uses a rotating magnetic field against a set of armature windings. The strength of the magnetic field controls the output voltage of the generator. So the AVR adjusts the magnetic field (the current to the field winding).
To adjust the magnetic field, if memory serves, you either have to move the magnets closer/further to the windings, or you'd have to increase the strength of the magnet, right?
The magnets in those ancient generators I've had apart had fixed magnets that were rotated by the engine, and they couldn't be moved in relation to the windings (as an aside, in one generator, one of the magnets had gone out of position and had worn away some of the windings to the point where they broke. When that machine was started.... Ah, the sparks that flew!).
I'm thinking that in the Champion then, either the magnets are electromagnets, not permanent magnets, that are adjusted by the AVR.
-or-
The AVR's transistors, which you mentioned below, open/close off resistive pathways, which, by V=IR, keeps the voltage constant for a given current draw...
It's the latter that's right, right? Or am I missing the boat entirely here?
If it is the latter, and the transistors were "closed" to begin with, then power would have to be supplied to open them up. Which also works with your explanation below. As the motor winds down, the transistors close, which increases the resistance, which decreases the current, which drops the voltage...
Or am I completely confused?
cnsayre
