Photovoltaic Array Tracking Linkage to Reduce Shading
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Solution Overview
Problem
Conventional tracking systems for photovoltaic arrays face issues with interference and shading due to large drive gears, and reliability problems with linear actuators, necessitating a solution that reduces the profile and interference with the array assembly.
Innovation Solution
A tracking system featuring a torque rail with an actuator positioned below it, using links and a slew drive mechanism to rotate the array, with mounting members that extend from the rail to amplify power and reduce interference, and a controller to adjust the array's position to follow the sun's path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If large drive gears are used to rotate the array, then the rotation function is achieved, but the array is shaded and other parts are interfered with
Solution Approach 1:
The patent extracts the drive mechanism from its conventional position along the torque rail and relocates it to a separate location. The actuator is positioned away from the torque rail, and rotation is transmitted through links connected to mounting members, thereby removing the large drive gears from the area where they cause shading and interference with the array.
Solution Approach 2:
The patent introduces links as intermediary elements to transmit rotational motion from the actuator to the torque rail. These links serve as mediators that allow the drive function to be performed remotely, eliminating the need for large gears in direct contact with the array structure and thus reducing shading and interference.
2Object-affected harmful factors
If taller rail modules are used to provide clearance, then interference is reduced, but the profile and complexity increase
Solution Approach 1:
The patent resolves the clearance issue by moving the actuator to a different spatial dimension - positioning it below the torque rail rather than increasing the height of rail modules. This dimensional repositioning provides the necessary clearance without increasing the overall profile or structural complexity of the system.
3Ease of operation
If linear actuators are used to rotate the array, then the rotation function is achieved, but reliability issues cause pivoting failure
Solution Approach 1:
The patent employs a dynamic linkage mechanism that allows for smooth, controlled motion transmission. The four-bar linkage system provides mechanical advantage and distributes forces more evenly, reducing stress on individual components and improving the reliability of the pivoting action compared to direct linear actuator engagement.
Data Source
AI summary
Tracking systems for adjusting a photovoltaic array are disclosed. In some embodiments, the tracking system includes an actuator that moves one or more links to cause the array to rotate. The tracking system may be disposed below a torque rail of the tracking system. The actuator may be a slew drive that retracts or extends the one or more links to cause the array to rotate.