Heidenhain: Rotary Encoder with Integral Bearing 827039-06 (EQN 1325)

Measuring angles with rotary encoders

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.

ExN 1300 Features:

ECN/EQN 1300 series

Absolute rotary encoders with integral bearing

• Wide axial tolerance of up to ±0.5 mm
• Tapered shaft
• Very high positioning accuracy of down to ±20"
• 33 554 432 positions/rev.
• Multiturn functionality for up to 4096 revolutions
• Max. operating temperature: 115 °C
• Evaluation of different external temperature sensors
• Interfaces: EnDat and DRIVE-CLiQ
• Housing diameter ≈ 56 mm

Rotary encoder with integral bearing
Differentiable            
revolutions:              4096
Positions per revolution: 8192
Data interface:           EnDat01
Output code:              Binary
Line count:               2048
Output signal:            ~1Vpp
Cutoff frequency (-3 dB): 400.00 kHz
Power supply:             3.6 V ... 14 V
Coupling version:         Expanding ring coupling 
                          for 65mm mating diameter
Shaft:                    Tapered shaft 1 to 10, 
                          functional diameter 9.25
                          mm, back-off thread M10 
                          and M6
Degree of protection:     IP40 (EN60529)
Operating temperature:    -40/+115 °C
Electrical connection:    Plug connector, 
                          straight, double-row, 
                          12-pin, with locking 
                          mechanism and walls
Pin configuration:        D323746
Connecting direction:     Cable outlet for axial 
                          and radial use
Included part:            self-locking screw M5 
                          x50 -8.8 DIN 6912
Please pay attention to the product documentation!