Patent ID: 8904774
Filing Date: 2014-12-09
Classification: F24S,Y02E,Y10T

Abstract:
1. A rotational actuator system for controlling rotation of a solar collector, said system comprising: a bi-directional motor that establishes a flow direction of hydraulic fluid to cause rotation of a bi-directional rotational actuator through an arc substantially perpendicular to a plane of the ground, wherein the arc has a selected upper limit of about 180 degrees to about 240 degrees; a control system hydraulically connected to said actuator for controlling rotation of the solar collector along the arc in either a clockwise or counter-clockwise direction depending on the flow direction of the hydraulic fluid from the bi-directional motor; wherein the control system and the actuator are connected by a closed-loop hydraulic circuit comprising first and second hydraulic lines; first and second pressure sensors for individually monitoring said first and second hydraulic lines; and a solenoid valve that is opened in response to dual pressure signals from both said first and second pressure sensors.