Absolute encoder

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Rotary encoders should be used in any application that requires precision motion control. While a power can be supplied to a motor to make it turn, to control exactly how fast it actually turns  requires real time feedback so that the controlling device can increase or decrease power to achieve a consistent motor speed or shaft position. Rotary encoders are therefore indispensable in precision motion control applications including servo motor feedback, robotics, factory automation and more.

- Absolute encoders provide a distinct digital code for each position, allowing for immediate position feedback without the need for homing or referencing.

- They retain position information even during power loss or system shutdown.

- They offer high accuracy and resolution, enabling precise positioning.

- Absolute encoders are immune to signal degradation or interference in long cable runs.

- Single-turn absolute encoders: These provide position information within a single revolution.

- Multi-turn absolute encoders: These can track and report multiple complete revolutions, providing extended range position feedback.

Yes, absolute encoders can provide position feedback without power. They have a non-volatile memory that retains the position information, allowing the encoder to resume providing accurate position feedback once power is restored.
Hengstler absolute encoders track position even without power permanently. They have either a non-volatile memory based on energy-harvesting technology or a well-proven gear-based detecting system that tracks the position information even if the encoder shaft moves without power. This allows the encoder to provide accurate true position feedback once power is restored and communication is started again. Therefore, Hengstler does not use batteries, meaning no lifetime restriction and always valid position at any time.

Absolute encoders are designed to be robust against electrical noise. They employ various techniques such as differential signaling, shielding, and filtering to minimize the impact of electrical noise on the accuracy of position readings.