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Two examples that do exactly what I described using exactly the scheme I described. Not new technology. I don’t understand why you can’t understand it. These have existed for years. It’s not for reliability but 12, 18...36 pulse drives naturally load share over a lot more switching elements. ABB has done tons of papers on surviving energized failures and touting DTC as a simple solution to the challenge.
Trying to spin up a “hot spare” should be simple but I gave you an alternative where the drive can survive failures in service.
During the late seventies when I got envolved in variable speed drives, no US manufacturers were heavily involved (in earnest) -- the design and manufacture of VFDs.
It wasn't even called VFD . . . It was called PWM.
At the time- I was a rookie engineer working with an engineer from Frankfurt, Germany on modernizing an old paper mill. Those on your catalog were latest entry in the band wagon.
PWM or VFD was invented in Finland by Martti Harmoinen in the early seventies.
At the time I was working with this German engineer in the paper mill-- no VFD distributors were at hand that we had to put together components on our own using the old hardy SCRs.
Finland was already using PWM on their street cars while US was still experimenting on them.
Reliance Motors was making bare bone mother boards to mount SCRs for a "put together" shop-made unit for primitive VFD.
I was involved on PWM/VFD much earlier than thirty years that you are talking about.
That's a brief history of VFD.
What I'm concerned mostly is your cavalier approach in proclaiming edicts that goes against the grain of sound engineering practice.
And you try to avoid the subject about "where is the source of info" that you can burn up a fuse and still keep the VFD running.
That's one touchy issue. And then you alluded to REDUNDANCY is a bunch of HOOEY.
Redundancy is subsumed in the design of avionics control system. Also applies in military equipment where survival takes the front seat.
As an example-- the attack warplane --the Warthog A10 also known as Thunderbolt is a survival piece of machinery. It is designed to destroy enemy tanks.
Because of its design for deployment in close - to- ground enemy fire--it can continue to fly for a safe landing even if the fuselage is almost blown apart.
The control system components is housed in a titanium enclosure and can take enemy fire from below.
An ugly looking airplane but if you're the pilot --you will feel assured of better chance of survival and get home alive because of its extensive redundant features.
In fact the aircraft's redundant features include its ability to return to airbase with half its wings missing.
I was at a sub-contractor's repair/assembly plant in Arizona where the fuselage was assembled at a maintenance plant.
I serviced their CNC Machines there years ago.
This is an example of the value of redundant design. . .it is not a decrease in reliability.
It is designed keep people alive.
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