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Positional repeatability measurements of stepper motors at cryogenic temperatures (1983)

Houck, J. R. ; Hall, M. S. ; Pompea, S. M. ; [et al.]

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Publication Date: 2019-06-28

Description: For 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.

Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING

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