HELIOSTAT MECHANICAL STOP AND METHOD OF FINDING HELIOSTAT HOME POSITION
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United States of America Patent
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app pub date -
Sep 23, 2014
filing date -
Sep 23, 2013
priority date (Note) -
Abandoned
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Abstract
A drive assembly for a heliostat and a method of determining the drive's home position are described. The drive assembly comprises at least one mechanical hard stop for impeding the motion of an output gear of at least one gear transmission driven by a motor. Each hard stop may be built into the housing of a gear transmission or may be made integral with an output gear. The method for determining the drive assembly's home position comprises the steps of iteratively actuating an output gear towards, and then away from, a hard stop feature while monitoring the input torque of the driving motor. When the motor input torque is registered to be higher than a predetermined trip torque, the stepper motor is commanded to stop and the home position of the drive assembly is determined.
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