HEIDENHAIN – For every application, the correct encoder

Whether small, large, singleturn or multiturn, optical or inductive, whether with or without integral bearing: HEIDENHAIN’s program of rotary encoders offers the right solution for any task and requirement. Either with inductive scanning or with optical scanning—both types of rotary encoders from HEIDENHAIN offer high control-loop performance and system accuracy for each application. There are also variants with functional safety and with mechanical fault exclusion. This prevents loosening of the shaft or stator connection.

Modern inductive rotary encoders have no reason at all to hide behind their counterparts with optical scanning. The encoders with optical scanning do remain the first choice for the high end of the application spectrum. However, in terms of control quality and dynamics, the new inductive solutions from HEIDENHAIN have gained significant ground, and in terms of durability they are even superior.


This is shown in comparative tests between the new generation of inductive rotary encoders, their predecessor models, and optical rotary encoders.

Of great significance for the suitability of HEIDENHAIN’s rotary encoders is that in many cases the mounting dimensions of the inductive variants are compatible with the optically scanned rotary encoders. The mechanical and electrical compatibility achieved this way makes it possible to select from the HEIDENHAIN program the suitable rotary encoder for the specific control requirements of the application and minimize the number of motor systems.

The permissible mechanical tolerance of the current inductively scanned series has also been greatly extended, for example by a factor of 2 for the permissible axial motion. For easy evaluation of the mechanical mounting, the encoders generate a valuation number, which the servo inverter reads out the purely serial EnDat interface. In addition, rotary encoders from HEIDENHAIN also support monitoring of the temperature in the rotary encoder as well as in the motor. An integrated temperature sensor monitors the temperature in the rotary encoder. An external temperature sensor in the motor winding can be connected to the rotary encoder. Without interrupting the control cycle, the rotary encoders evaluate data from the two sensors and the subsequent electronics can read out the data digitally via the EnDat 2.2 interface.