The sun-tracking control of solar collectors using high-performance step motorsSun-tracking solar energy-focusing devices involving a central receiver, thermionic conversion, or a distributed solar thermal collector system are described. The Perkins solar collector uses a fixed focal point about which an 18 m-diameter parabolic dish moves on tracks. The elevation axis also moves on a circular track. A microprocessor manipulates sun sensor information and sun ephemeris data to ensure correct placement. Stepper motors are digital devices which provide direct interface with digital electronics and a wide dynamic range, and could easily be associated with the microprocessors. Design philosophy, performance criteria, wind load analysis, and control system requirements are also discussed.
Document ID
19770052178
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hughes, R. O. (California Institute of Technology, Jet Propulsion Laboratory, Control and Energy Conversion Div., Pasadena Calif., United States)
Date Acquired
August 9, 2013
Publication Date
May 1, 1977
Subject Category
Energy Production And Conversion
Meeting Information
Meeting: Annual Symposium on Incremental Motion Control Systems and Devices