Maximum performance for climate protection

Hengstler encoders play an important role in the energy transition: they ensure the optimal alignment of PV modules and rotor blades on wind turbines. The use of encoders can significantly increase the yield of these systems.

In order to make optimum use of the kinetic energy of the wind, the angle of attack of the rotors must be constantly adjusted to the wind conditions. The exact position of the rotors is required for their precise alignment. The ACURO AC58 absolute encoder from Hengstler determines this position using an optical transmitted light method with an absolute accuracy of ±35'‘ and a repeat accuracy of ±10’'. Due to their reliability, the rotary encoders are ideal for use in wind energy and PV systems, which are often exposed to harsh weather conditions. Despite the optical system used in the encoders, neither lightning strikes, condensation, seawater, nor high temperatures (up to +100 °C) can impair the function of the ACURO AC58. The absolute encoder has already been installed in thousands of wind turbines and has impressively proven its robustness in these applications. Hengstler also offers a customized version of the encoder for offshore applications.

The optical method used in the ACURO AC58 is based on a monolithically integrated opto-ASIC, in which all optical and electronic components are arranged on a silicon chip. To determine the position value, an LED emits light that is modulated by a code pattern attached to a rotating disc. The opto-ASIC then scans the pattern, with each position being assigned a unique bit pattern. Since the rotary encoder immediately detects the position of the shaft even when de-energized, the ACURO AC58 absolute encoders are ideal for fail-safe applications. The encoders are supplied with aluminum housings as standard, but are also available in more robust designs on request.

Precise alignment of PV modules

Hengstler encoders also ensure maximum energy yield in photovoltaic systems. The ACURO AR series absolute encoders are used in the actuators of PV modules, where they detect the angle of the modules. This value is transmitted to the system control and compared with the pre-programmed sun path (astronomical control) or the light conditions determined by the sensor. The modules are then optimally aligned with the sun.

Encoders from the ACURO AR series by Hengstler operate according to the magnetic scanning principle and are therefore wear-free. The encoders offer resolutions of up to 28 bits (12 bits single-turn/16 bits multi-turn) and a wide temperature range (–40 to +100 °C). Since the absolute encoders can be operated independently of any external power source, they are particularly suitable for agri-PV systems, which are usually located far away from power grids. Hengstler offers the ACURO AR series encoders in various versions – all of which are very compact with a housing depth of only 32 mm.