Positional Repeatability Measurements Of Stepper Motors At Cryogenic Temperatures

Stephen M. Pompea; Michael S. Hall; Frank Bartko; James R. Houck

doi:10.1117/12.934193

16 August 1983 Positional Repeatability Measurements Of Stepper Motors At Cryogenic Temperatures

Stephen M. Pompea, Michael S. Hall, Frank Bartko, James R. Houck

Proceedings Volume 0364, Technologies of Cryogenically Cooled Sensors and Fourier Transform Spectrometers II; (1983) https://doi.org/10.1117/12.934193
Event: 26th Annual Technical Symposium, 1982, San Diego, United States

Abstract

Stepper motors operating at liquid helium temperature have multiple applications in cryogenically-cooled telescopes such as the Shuttle Infrared Telescope Facility (SIRTF). These SIRTF applications include driving cryogen flow valves, operating the Multiple Instrument Chamber (MIC) beam splitter mechanism, and operating filters and grating wheel mechanisms in the scientific instruments. The positional repeatability of the beam splitter drive mechanism is especially critical since it feeds the optical beam to the scien-tific instruments. Despite these important applications, no significant data on the positional repeatability of stepper motors at cryogenic temperatures has been available. Therefore, we conducted a series of measurements to determine the positional repeatability of a modified, off-the-shelf Berger/Lahr stepper motor (model RDM 253/25, step angle 3.6°) which had demonstrated excellent performance in previous endurance testing at LHe temperature. These test results indicated that the positional repeatability of the motor was excellent at all temperatures, with somewhat better performance at cryogenic temperatures. Another important result was that the motor could be repeatedly turned off and on while still accurately retaining its rotor position.

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Stephen M. Pompea, Michael S. Hall, Frank Bartko, and James R. Houck "Positional Repeatability Measurements Of Stepper Motors At Cryogenic Temperatures", Proc. SPIE 0364, Technologies of Cryogenically Cooled Sensors and Fourier Transform Spectrometers II, (16 August 1983); https://doi.org/10.1117/12.934193

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KEYWORDS

Cryogenics

Temperature metrology

Beam splitters

Mirrors

Space telescopes

Infrared telescopes

Autocollimation

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