1. ECN, EQN, ERN series rotary encoders - with built-in bearings and mounted stator couplings, protection class IP64 

Heidenhain company's ECN, EQN and ERN series rotary encoders with built-in bearings and stator couplings, using photoelectric scanning principle. It is characterized by simple installation and short overall length. Applications range from simple measurement to control the position and speed of servo drives. The hollow shaft of the encoder can slide directly into and be fixed to the measured  shaft. During angular acceleration, the stator coupling must absorb only the torque caused by bearing friction. Therefore, rotary encoders with stator couplings have excellent dynamic performance and high natural frequency. 

2. ECN, EQN, ERN series rotary encoders - with built-in bearings and mounted stator coupling, protection class IP40 

Heidenhain ECN, EQN and ERN series rotary encoders protection class is IP40, especially suitable for built-in in the motor. Bearings and mounted stator couplings are integrated into one. Absolute rotary encoders and encoders with commutating track are suitable for synchronous motors. It is fixed directly on the measured shaft through the taper shaft or blind hole shaft. Therefore, its connection rigidity is high and it has extremely high drive dynamic performance. The stator coupling is fixed on the plane or in the positioning hole to speed up and simplify the installation work. 

3. ROC, ROQ, ROD, RIC, RIQ series rotary encoders - with built-in bearings, split coupling, HR handwheel 

Heidehain ROC, ROQ and ROD series photoelectric encoders and RIC and RIQ series induction encoders are with built-in bearings and seals. Depending on the version, the protection level is IP64 to IP66. These encoders are rugged and compact. The rotor of these encoders is connected to the measured shaft by a separate coupling that compensates for the axial clearance and the discoaxiality between the encoder shaft and the measured shaft. 

4. ECI, EQI, EBI, ERO rotary encoder - no built-in bearing induction rotary encoder 

ECI/EQI 1100 and ECI/EQI 1300 mechanical size compatible with the corresponding ExN photoelectric encoder: fixed shaft with center bolt. The stator of the encoder is fixed in the positioning hole with multiple bolts. The ECI/EBI 100 induction rotary encoder has a particularly small outside diameter but a large shaft hole. It is installed by sliding into the shaft and securing from the back with axial bolts. Heidenhain's photoelectric ERO series modular rotary encoders consist of a circular grating code disc with a wheel hub and a reading head, which especially suitable for applications where installation space is limited or friction is not allowed. The correct installation of the rotary encoder without built-in bearings can be checked with Heidenhain's PWM 20 measurement and tester.

1. ECN, EQN, ERN 1000 series 

• Micro 

• Blind shaft, 6 mm inner diameter 

• Outer diameter of the housing: 35 mm 

• Natural frequency of the encoder stator coupling: ≥500 Hz 

• Mechanical allowable speed: ≤12000 rpm 

2. ECN, EQN, ERN 400 series 

• Compact structure 

• Blind shaft or hollow shaft, 8 or 12 mm inner diameter 

• Outer diameter of housing: 58 mm 

• Protection class: The housing is IP 67 (hollow shaft is IP 66) and the input end of the shaft is IP 64 (IP 66 is available if required by the user) 

• The natural frequency of the encoder stator coupling: ≥1400 Hz (cable version) 

• The mechanical allowable speed: ≤12000 rpm 

3. ECN/ERN 100 series 

• Large diameter shaft 

• Hollow shaft, inner diameter D: 20,25,38,50 mm 

• Outer diameter of the housing: 87 mm 

• Natural frequency of the encoder stator coupling: ≥1000 Hz 

• Allowable mechanical speed: D≤30 mm: ≤6000 rpm D > 30 mm: ≤4000 rpm 

4. ECN/EQN 1100 series 

• Micro 

• Blind shaft Φ6 mm with locking fit 

• Outer diameter 35 mm housing 

• encoder stator coupling natural frequency: ≥1000 Hz 

• Permissible mechanical speed 12000 rpm 

• Protection against loosening of mechanical connections that meet functional safety requirements 

5. ERN 1123 series

• Blind shaft Φ8 mm 

• Outer diameter 35 mm Housing 

• Stator coupling with bolt hole circle Φ40 mm 

• Stator coupling natural frequency: ≥1000 Hz 

• Mechanical allowable speed 6000 rpm 

6. ECN, EQN, ERN 1300 series 

• Compact structure 

• 1:10 taper shaft, effective diameter 9.25 mm, extremely rigid connection 

• Outer diameter 56 mm. Stator coupling for 65 mm bore positioning holes 

• Encoder stator coupling natural frequency: ≥1800 Hz 

• Mechanical allowable speed ERN/ECN: 15000 rpm EQN: 12000 rpm 

• Post-installation protection Class IP40 

• Protection against loose mechanical connections to meet the requirements of functional safety features 

7. ROC, ROQ, ROD 1000 series 

• Miniature size, For installation in small equipment or where space is limited 

• Mounting with synchronous flanges 

• Shaft diameter 4 mm 

8. ROC/ROQ/ROD 400 series 

• Industry standard dimensions and output signal 

• Housing end protection class IP 67, shaft input IP 64 (if required, IP 66) 

• Mounting with synchronous or clamping flanges 

• Bearing diameter 6 mm with synchronous flanges 10 mm with clamping flanges 

• Preferred model for fast delivery (see rotary encoder sample or contact Heidham) 

• Protection against loose mechanical connections for functional safety features 

9. RIC/RIQ 400 series 

• Induction scanning principle 

• Low precision application, accuracy ±480" 

• Mechanical structure same as ROC/ROQ 400 

10. ECI/EQI/EBI 1100 series 

• Small size 

• Simple installation without adjustment 

• Blind hole shaft Φ6 mm 

• EBI 1135: Multi-turn function is achieved by using a multi-turn counter powered by a backup battery 

• Multiple versions compatible with ECN/EQN 1100 installation modes 

• Protection against loose mechanical connections that meet the requirements of functional safety features 

11. ECI/EQI 1300 Series 

• Easy installation, No need to adjust 

• Blind shaft • If the user needs, Available in versions compatible with ECN/EQN1300 taper shaft or blind shaft mounting modes 

• Protection against loose mechanical connections for functional safety features 

12. ECI/EBI 100 Series 

• Ultra-flat construction • Hollow shaft Φ50 mm 

• EBI 135: Multi-turn function achieved by using a multi-turn counter powered by a backup battery 

13. ERO 1200 series 

• Compact structure 

• Shaft diameter up to 12 mm 

14. ERO 1400 series 

• Micro-modular rotary encoder with shaft diameter up to Φ8 mm 

• Comes with dedicated installation AIDS 

• with protective cover

Angle encoders and rotary encoders with built-in bearings and stator couplings, whose circular grating coders are directly connected to the axis under test. The reading head is mounted on the shaft via ball bearings and supported by a stator coupling. Therefore, the coupling must absorb only the torque caused by bearing friction, especially during angular acceleration of the shaft. As a result, these Angle encoders have excellent dynamic performance. Due to the stator coupling, the coupling error is included in the system accuracy. Other advantages of stator couplings include: 

• Simple installation 

• Short overall length 

• High natural frequency of couplings 

• The use of hollow shaft

Built-in bearing Angle encoders and rotary encoders are connected with separate couplings for solid shafts. This recommended connection of the axis under test compensates for radial and axial errors. Angle encoders for split couplings support higher shaft speeds. No built-in bearing Angle encoders and rotary encoders work without friction. The assembly requires the adjustment of two components to each other - the reading head and the round grating code plate, the grating drum or the steel strip grating ruler. Advantages: 

• Small space required 

• Large diameter hollow shaft 

• Allows high shaft speed 

• No additional starting torque 

Incremental Angle encoders and rotary encoders determine the current position by calculating the number of measurement steps from the origin, or by calculating the number of signal cycles after subdivision processing. Heidenhain's incremental encoder has a reference point to reconstruct the origin. The incremental rotary encoder with commutation signal provides the axial Angle position value without the need to perform a return to zero, which is accurate enough to correctly control the phase of the rotating magnetic field of the permanent magnet three-phase motor. Absolute Angle encoders and rotary encoders can provide the current position value directly without performing a reference point return to zero operation. The single-turn encoder provides the current angular position value with only one turn, while the multi-turn encoder can also distinguish the position between different turns. Location values are transmitted via EnDat, SSI, PROFIBUSDP, PROFINET, or other serial data interfaces. The EnDat bidirectional interface, PROFIBUS-DP or PROFINET support automatic configuration of the upper layer electronics and provide monitoring and diagnostic functions. Heidenhain encoders with functional safety features are single-encoder systems using pure serial data transmission for high-security machine tools and systems. Two independent measurements are formed in the encoder and transmitted to the safety control system through the EnDat interface.