{"id":4451,"date":"2026-08-01T10:33:51","date_gmt":"2026-08-01T02:33:51","guid":{"rendered":"https:\/\/solartrackersystem.com\/?p=4451"},"modified":"2026-08-01T10:33:54","modified_gmt":"2026-08-01T02:33:54","slug":"azimuth-only-single-axis-solar-trackers","status":"publish","type":"post","link":"https:\/\/solartrackersystem.com\/fr\/azimuth-only-single-axis-solar-trackers\/","title":{"rendered":"Azimuth-Only Single Axis Solar Trackers: Structure, Control Principles, and Real-World Applications"},"content":{"rendered":"

In the rapidly evolving landscape of renewable energy, single axis solar trackers<\/strong> have emerged as a proven technology to maximize photovoltaic energy yield. Among the various tracker configurations, the azimuth angle<\/strong> tracking system<\/a>\u2014also known as the vertical single-axis tracker\u2014offers a unique mechanical approach that rotates solar panels around a vertical axis to follow the sun’s daily east-to-west path. This article provides a comprehensive technical overview of azimuth-only single axis trackers, covering their structural design, control methodology, and specific industry examples.<\/p>\n\n\n\n

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Structural Design and Mechanical Principles<\/h2>\n\n\n\n

Un azimuth angle<\/strong> single axis tracker fundamentally differs from the more common horizontal single-axis tracker. While horizontal trackers rotate around a north-south aligned horizontal axis to change panel tilt throughout the day, azimuth-only trackers rotate the entire panel assembly around a vertical axis, much like a weather vane following wind direction. This configuration allows the solar array to sweep through the full 360-degree compass range, directly addressing the sun’s changing azimuth angle<\/strong> from sunrise to sunset.<\/p>\n\n\n\n

The structural system comprises four core components:<\/p>\n\n\n\n

1. Foundation and Vertical Pylon:<\/strong> A robust steel or concrete pylon anchored to the ground provides the primary vertical axis. This pylon must withstand both the dead weight of the panel array and dynamic wind loads transmitted through the rotating structure.<\/p>\n\n\n\n

2. Azimuth Rotation Mechanism:<\/strong> At the top of the pylon, a slewing bearing or rotary drive assembly enables smooth horizontal rotation. In many designs, a worm gear and worm wheel mechanism is employed because it offers self-locking characteristics\u2014preventing the tracker from rotating under wind forces when the motor is inactive.<\/p>\n\n\n\n

\"Solar<\/a><\/figure>\n\n\n\n

3. Panel Mounting Frame:<\/strong> The torque tube or mounting frame extends horizontally from the rotation mechanism, carrying multiple photovoltaic modules in portrait or landscape orientation. The frame is engineered to maintain structural rigidity across long rows while minimizing torsional deflection.<\/p>\n\n\n\n

4. Drive System:<\/strong> A DC motor, stepper motor, or AC motor paired with a high-ratio gearbox (often 40:1 or higher) provides the precise rotational force. Linear actuators may also be integrated in certain patented designs to push or pull the array through its azimuth arc.<\/p>\n\n\n\n

\"Single<\/a><\/figure>\n\n\n\n

The diagram above illustrates the fundamental distinction between horizontal and vertical single-axis tracking. In the vertical configuration (right side), the panel rotates around a vertical post, making it ideal for sites where the solar tracking system<\/strong> must adapt to uneven terrain or where a full 360-degree sweep is mechanically advantageous.<\/p>\n\n\n\n

5. Dual axis solar tracker without linear actuators. We can apply this construction to be azimuth angle single axis solar tarckers.<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n
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Control System Architecture and Operating Principles<\/h2>\n\n\n\n

The control architecture of an azimuth-only solar tracking system<\/strong> balances precision, reliability, and energy efficiency. Modern controllers employ one of three strategies:<\/p>\n\n\n\n

Open-Loop Astronomical Control<\/h3>\n\n\n\n

The most prevalent method uses embedded astronomical algorithms. The controller calculates the sun’s real-time azimuth angle<\/strong> based on the installation site’s GPS coordinates, date, time, and established solar position equations (such as the PSA or SPA algorithms). The motor then rotates the panel to match the calculated azimuth. This approach eliminates sensor drift and operates reliably under overcast conditions.<\/p>\n\n\n\n

Closed-Loop Sensor-Based Control<\/h3>\n\n\n\n

In this configuration, four photodetectors arranged at 90-degree intervals (east, west, south, north) detect differential light intensity. The controller computes error signals:<\/p>\n\n\n\n