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Heidenhain Angle Encoders

Heidenhain offers many different models of Angle Encoders. The term angle encoder is typically used to describe encoders that have an accuracy better than ± 5” per line count above 10,000. Angle encoders are used in applications requiring precision angular measurements to accuracies within several arch seconds.


· Rotary tables on machine tools

· Swivel heads on machine tools

· C-axes of lathes

· Measuring machines for gears

· Printing units or printing machines

· Spectrometer

· Telescopes


In contrast, rotary encoders are used in applications where accuracy requirements are less stringent, eg. automation, electrical drives, and many other applications.

Heidenhain Angle Encoders can have one of the following designs:

  1. Angle Encoders with Integral Bearings
  2. Angle Encoders without Integral Bearings
  3. Modular Magnetic Encoders


(1) Heidenhain Angle Encoders with integral bearing, hollow shaft, and stator coupling. Because the design and mounting of the stator coupling, it must absorb only that torque caused by friction in the bearing, particularly during angular acceleration of the shaft. These angle encoders therefore provide excellent dynamic performance. Thanks to the stator coupling, the system accuracy includes the error of the shaft coupling.

The RCN, RON 200, RON 786 and RPN angle encoders have an integrated stator coupling, whereas the ECN has a stator coupling mounted on the outside. Other advantages: compact size for limited installation space. Hollow shaft diameters up to 100mm to provide space for power, etc. Simple installation. Versions with functional safety available on request.

(2) Angle Encoders without integral bearing: The ERP, ERO, and ERA angle encoders without integral bearing (modular angle encoders) are intended for integration in machine elements or apparatuses. They are designed to meet the following requirements: large hollow shaft diameters (up to 10m with a scale tape), no additional starting torque for shaft seals, and segmented versions.

(3) Modular Magnetic Encoders: The robust ERM modular magnetic encoders are especially suited for use in production machines. The large inside diameters are available, their small dimensions and the compact design of the scanning head predestine them for: the c-axes lathes, simple rotary and tilting axes (for speed measurement on direct drives for integration in gear stages), spindle orientation on milling machines or auxiliary axes.