Positional repeatability measurements of stepper motors at cryogenic temperaturesFor cryogenically-cooled infrared instruments and telescopes employed in space, reliable and predictable motor operations at 4 K in vacuum are in most cases necessary. For the Shuttle Infrared Telescope Facility (SIRTF), stepper motors may be employed in a number of applications. A test facility was designed and built for measuring stepper motor positional repeatability, in vacuum, over a temperature range from ambient to liquid helium temperature. Tests regarding positional repeatability were conducted at different motor speeds, directions of motor rotation, step sizes, and power conditions. In addition, tests were performed with respect to the ability of the motor to remain in a position with no power applied to the motor.
Document ID
19840044533
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Pompea, S. M. (Martin Marietta Aerospace, Denver; Colorado State University Fort Collins, CO, United States)
Hall, M. S. (Martin Marietta Aerospace Denver, CO, United States)
Bartko, F. (Martin Marietta Aerospace Denver, CO, United States)
Houck, J. R. (Cornell University Ithaca, NY, United States)