[AT] Texas AM wind tunnel changes motor after 70 yrs

Rob Wilson ro.wilson at att.net
Mon May 28 18:59:11 PDT 2012


Allis-Chalmers sure built some dependable pieces. 
Rob

http://phys.org/news/2012-05-tunnel-motor.html

Sample quote

A new motor has been installed in the Oran W. Nicks Low Speed Wind Tunnel,
replacing a 900RPM, 1,000-horsepower synchronous motor from Allis-Chalmers
that was surplused by the U.S The old motor was in service at the Low Speed
Wind Tunnel for 70 years. 
The new motor is a 3,000-horsepower induction motor with a variable
frequency drive that allows for spinning the motor anywhere from less than
100 RPM to 1,200 RPM. The motor and drive package were purchased from
TECO/Westinghouse.
.....
The first spin of the prop demonstrated a remarkable decrease in vibrations
and noise, as well. Testers were able to stand in the tunnel at 30 mph and
hold a normal conversation, something that would have been impossible with
the old motor. While it may not seem incredibly important for wind tunnel
aerodynamic testing, when you are testing bicycles and riders or downhill
skiers in the tunnel at very low speeds, it is critical.
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