[Milsurplus] 400 Hz Static Inverter

[Francesco Ledda]

Well, I know that they can handle large load variations. I guess the problem
is how quickly the load changes. 

Now, an asynchronous motors look like a transformer (load wise); at start,
they look like a transformer with a shorted secondary, and max "unloaded"
speed (synchronous speed), they look like a transformer with no load.
Therefore, the PF of the load can easily go from one extreme to the other. 

These converters are designed to work with "lathes" and similar industrial
equipment; these, by nature, provide sudden load variation, during their
operation. I am hopeful that it may work with some of my radio stuff.  

Francesco


-----Original Message-----
From: Nick England [mailto:navy.radio at gmail.com] 
Sent: Monday, April 30, 2012 4:35 AM
To: Francesco Ledda
Cc: milsurplus at qth.net
Subject: Re: [Milsurplus] 400 Hz Static Inverter

I looked into these controllers. They all have big warnings about switching
the load. So you could transmit about once every 10 minutes maybe. Rats!



On Apr 29, 2012, at 9:55 PM, "Francesco Ledda" <frledda at att.net> wrote:

> Has anyone tried one of those AC/AC converters for motor control? They 
> are pretty cheap and can go up to 1000Hz.
> 
> -----