Thermite, you have no clue..... Try sourcing a DC motor and drive package in the 10-15 HP range.
LOL! Tempting, Been looking at 7.5 HP RPM III's for re-motoring an AC machine or two. But so far, 5 HP - or even less - (3 HP for the 10EE's..) is all I have needed "in THIS role".
Continuous mining machines were a tad larger.
So "catch up in the back!", then. There is no shortage.
Though nobody can
require that you leave a 40 year outdated time-warp for the present day, can they?
But It looks kinda odd .. to criticize those who HAVE tried to keep up with the present-day when you
have not!
You shudda googled what your hermit-kingdom thinks "does not exist .."
To wit:
"Reliance" hasn't "given up". They are
owned by ABB, operated under Baldor-Reliance:
DC Drives - Baldor.com
A different component of ABB makes the larger DC Drives from 12 HP
(and under, if you chose to use them that way..) to
twenty four THOUSAND HP.. So every size in between fractional and massive HP
is COVERED
with current products:
DC drives | ABB
I like "other" DC drives, but for motors? My favourites are their "RPM III" series:
RPM III Motors - Baldor.com
"GE" branding was coming out of factories in CHINA, last time I looked. But they, too, offer lamination-frame "Rectified Power" optimized DC motors.
There are plenty of others to make up a 20 billion bucks a year market..
Other DC Drives makers, too:
Control-Techniques has been sold and traded MANY times. They still do what they have always done. Make good DC drives.
DC Drives | Industrial DC Drives | Control Techniques
Parker makes DC drives, fractional HP to multiple thousands of HP:
https://ph.parker.com/us/en/dc-drives
Eurotherm has a new line:
ER-PL/ER-PLX | Eurotherm by Schneider Electric
"You doubt"? No fear. I believe you.
"Meanwhile...'
The global DC drives market size was USD 4.34 billion in 2018 and is projected to reach USD 6.71 billion by 2026, exhibiting a CAGR of 5.7% during the forecast period...."
"Read More at:- https://www.fortunebusinessinsights.com/industry-reports"
End of the day, "the REAL world" is paying for those 5 billion dollars worth of DC Drives.
And the DC DRIVES ...are the least part of the cost. World pays a LOT more for the DC motors.. 20 Billion-plus:
https://www.grandviewresearch.com/industry-analysis/electric-dc-motor-market
The HARD part.. is that folks cannot as easily afford the GOOD DC motors as the cheap AC ones.
Now.. if you happen to
ALREADY HAVE a decent Dee Cee motor.... one that "came with" a Grand-Old machine-tool, and was even DESIGNED IN, tested, tuned, and even
proven in USE? . IN that very machine-tool?
They are treasures. Why break what wasn't broken?
I did say the DC
Drive was the CHEAP part?
Run what you got!
That was what you got it FOR!