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Alma
The prototype of the ALMA (Atacama Large Millimeter Array) radio telescope, completed testing at the NRAO site in Socorro, New Mexico. The complete radio telescope will consist of an array of over 50, 12 m diameter, submillimeter radio telescopes to be installed at 5000m height in the Atacama desert in northern Chile. This will be the one of the largest radio telescopes in the world, with a resolving power on a par with an optical telescope. The ESO built prototype is driven by a 3.2 m diameter direct drive for Azimuth and by a novel IP68 direct drive arc motor, on a 3 m radius, for Elevation. Both drives are rated approximately 100,000 Nm. Motors and drives are supplied by Phase Motion Control.
For more information: www.eso.org/projects/alma/
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In large diameter applications, from the 16 m, 300,000 Nm ring motor
controlling the GRANTECAN telescope in the canary Islands to the 4
10 diameter direct drives which operate the European Southern Observatory
VLT telescope in the Atacama desert in Chile, Phase Motion Control
large direct drives are engineered to position large structures to
submicron accuracy. In the back of the actuator, a multiturn absolute
encoder which is used for electronic control of the electric piston
across the stroke.
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