Heidenhain: Rotary Encoder with Integral Bearing 803428-01 (EQN 1125)

Absolute rotary encoder (multiturn) with integral bearing for mounting by stator coupling

Mounting variants

In rotary encoders with integral bearing and stator coupling, the graduated disk of the encoder is connected directly to the shaft to be measured. The scanning unit is guided on the shaft via ball bearings, supported by the stator coupling. During angular acceleration of the shaft, the stator coupling must absorb only that torque resulting from friction in the bearing, thereby minimizing both static and dynamic measuring error. Moreover, the coupling mounted on the stator compensates axial motion of the measured shaft. Other benefits of the stator coupling are:

Rotary encoders with integral bearing that are conceived for separate shaft coupling are designed with a solid shaft. The recommended coupling to the measured shaft compensates radial and axial tolerances. Angle encoders for separate shaft couplings permit higher shaft speeds.

Rotary encoders without integral bearing operate without friction. The two components - the scanning head and the scale disk, drum, or tape - are adjusted to each other during assembly. The benefits are:

Rotary encoders with integral bearing

HEIDENHAIN ERN, ECN and EQN rotary encoders with integral bearing and mounted stator coupling are characterized by simple mounting and short overall length. Possible applications range from simple measuring tasks to position and speed control on servo drives. The hollow shaft of these encoders is slid directly onto and fastened to the shaft to be measured.

ROD, ROC and ROQ rotary encoders from HEIDENHAIN have their own bearings and are sealed. They are robust and compact. These encoders are coupled by the rotor to the measured shaft through a separate coupling that compensates axial motion and misalignment between the encoder shaft and measured shaft.

Direct shaft coupling

The hollow shaft allows the rotary encoder to be directly coupled to the mating shaft. An additional rotor coupling is not required. The resulting high rigidity permits higher bandwidths in the control loop, reduces inaccuracy, and simplifies installation.

Functional safety

Rotary encoders from this series are available with functional safety and a safe mechanical connection. Once integrated into an application with up to SIL 2 safety, they minimize malfunctions and facilitate the safe operation of machines and systems.

Flexible coupling

The stator coupling compensates for play between the motor and the rotary encoder, thereby reliably correcting inaccuracy. Even tilt and axial play can be compensated for. The stator coupling also facilitates easy mounting onto the plane surface.

Compact design

The ECN/EQN 1100 series encoders feature high reliability and ruggedness in a compact design. Their small footprint makes them ideal for tight installation spaces.

ECN 1100 and EQN 1100 series

Absolute rotary encoders with integral bearing

• Stator coupling for plane surface
• Axial tolerance of up to ±0.5 mm
• Blind hollow shaft
• Positioning accuracy of down to ± 60''
• 8 388 608 positions/rev.
• Multiturn functionality for up to 4096 revolutions
• Maximum operating temperature: 115 °C
• Interfaces: EnDat and DRIVE-CLiQ
• Housing diameter ≈ 35 mm