Incremental encoder AE series

absolutefor aircraftfor motors

Absolute encoders from FAULHABER detect the position of the shaft immediately after switching on. This can make a reference run unnecessary – an important prerequisite for many applications. Additionally, absolute encoders can be used to commutate brushless DC-motors. This eliminates not only the integrated Hall sensors for the motors but also reduces the wiring requirements. Like all components from FAULHABER, the encoders have an extremely compact design. Integrating them in drive results in either none or only minimal increase in the overall length. What is an absolute encoder? Unlike the incremental encoder, an absolute encoder determines absolute positions, not relative positions. After switching on the absolute encoder, an absolute return value is available for each position of the motor shaft. A distinction is made between single- and multi-turn encoders. The absolute encoders from FAULHABER are all based on a magnetic measurement principle. How does a magnetic absolute encoder work? A magnet on the motor shaft moves with the motor revolution, and its magnetic field rotates with it. This rotating change is detected by a sensor and is output by the encoder's electronics. The position of the shaft can be derived from this value. The magnetic measurement principle is insensitive to dust and is generally very robust. How are FAULHABER absolute encoders designed? The rotating magnetic field is generated by a two-pole sensor magnet that is fastened to the motor shaft. Located above the sensor magnet is an encoder chip. In addition to sensors, it contains additional components that are necessary for signal processing.