Design limits of electric motors?

[Rich Grise]

"K Williams" <krw@adelphia.net> wrote in message
news:q5GdndAdscxtolbdRVn-vw@adelphia.com...

Rich Grise wrote:
What do they call that thing where the projectile from a big
gun is another, not so big, gun?

Never heard of such a thing. I've heard of rockets being fired out
of guns and projectiles that bleed gas from the rear to help the
aerodynamics, but why would one launch a gun from a gun? Seems
like wasted throw-weight.

I suppose I was hallucinating when I thought it up, but I had
the impression that I'd read something about something like
this, and it had something to do with muzzle velocity, a la
the tachypomp.

I even seem to remember a diagram of sorts, where the "inner
gun" is really a big bullet with a hole drilled in it, and
some propellant and another projectile. I have no idea how
they fired it; presumably some kind of time fuze.

Cheers!
Rich

 

[Sir Charles W. Shults III]

"K Williams" <krw@adelphia.net> wrote in message
news:q5GdndAdscxtolbdRVn-vw@adelphia.com...

Never heard of such a thing. I've heard of rockets being fired out
of guns and projectiles that bleed gas from the rear to help the
aerodynamics, but why would one launch a gun from a gun? Seems
like wasted throw-weight.

Perhaps if the launched gun could spot the target as it passed and shoot
it from the side?
Similar systems are launched to destroy the magazines of tanks as an
example. They are fired over it, and then they explode downward to give the
full effects from one angle.

Cheers!

Sir Charles W. Shults III, K. B. B.
Xenotech Research
321-206-1840

 

[Jtiggr]

just as a reference, the large motor guys have worked with the large
adjustable speed drive guys to achieve some impressive super-synchronous
feats. I was involved with a 3500 Hp 2 pole motor that with the ASD at top
frequency would put out 11,500 rpm.
And yes, keeping the rotor and bearings together was more a mechanical
problem than electrical.
jtiggr

 

[Terry Given]

"Jtiggr" <jtiggr@hotmail.com> wrote in message
news:EuNAc.6929$5y3.3123@newssvr24.news.prodigy.com...

just as a reference, the large motor guys have worked with the large
adjustable speed drive guys to achieve some impressive super-synchronous
feats. I was involved with a 3500 Hp 2 pole motor that with the ASD at
top
frequency would put out 11,500 rpm.
And yes, keeping the rotor and bearings together was more a mechanical
problem than electrical.
jtiggr

now thats honking! the best I can manage is a 730Hz inside-out PMSM that
stored 3MJ in the rotor (J=0.25 in SI units IIRC). the DSP for that puppy
was quite tricky, as we were sampling comparatively slowly (BLT, internal
model control, blah blah blah)

cheers
Terry