Date: 2013-08-01

Schaeffler introduces Fully integrated linear actuator and rolling bearing units designed for solar tracking systems

Photovoltaic (PV), concentrating photovoltaic (CPV) and concentrating solar power (CSP) systems operate more efficiently when their mirrors, collectors and PV modules accurately track the course of the sun during the day. The more precise and trouble-free these systems are, the more efficient and profitable the solar power plants operate.

By offering its linear actuator and bearings for swivel drives as a complete system, Schaeffler has taken another step towards the full integration of precision solar tracking systems for azimuth and elevation axes.

The linear actuator responsible for stroke movements in the elevation axis was custom designed to withstand the harsh operating conditions typically found in solar power plants. The linear actuator is designed for dynamic loads of up to 5kN and static loads of up to 15kN. The actuator can reach a stroke travel of up to 1,000mm at a stroke speed of 5 mm/s.

The complete mechatronics system comprises the rolling bearings for the individual bearing positions, screw drive spindle and spindle nut, extension tube, compact housing with cover, seal, drive technology (motor and gearbox unit), the sensors, and rod end for connecting the actuator. The innovative design and high flexibility of the unit allow the stroke length and mounting to be matched precisely to individual customer requirements.

The linear actuator can operate in high temperatures and is protected from dust, sand, wind and rain. Due to an encapsulated housing, a reduced number of fully-sealed joints, as well as an integrated motor, gearbox unit and entire drive technology, the linear actuator is able to operate maintenance-free. The sealing components provide the actuator with an IP66 protection rating, which prevents the ingress of contaminants such as water and sand. With its low-maintenance requirements and bearing supports, the linear actuator provides an operating life of up to 25 years.

The high precision axes ensure that the solar power plants generate optimum power output on a continuous basis. Schaeffler

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