Mechanical Design Types and Mounting

ECN/ERN 100

Rotary encoders with Integral Bearing and Stator Coupling

ECN/EQN/ERN ECN/EQN/ERN 400: rotary encoders have integrated bearings and a mounted stator coupling. They compensate radial runout and alignment errors without signifi cantly reducing the accuracy. The encoder shaft is directly connected with the shaft to be measured. During angular acceleration of the shaft, the stator coupling must absorb only that torque caused by friction in the bearing. The stator coupling permits axial motion of the measured shaft: ± 1 mm ERN 1000: ± 0.5 mm ECN/ERN 100: ± 1.5 mm
ECN:L = 41 min. with D 25 L = 56 min. with D 38 Position Encoders for Servo drives). universal stator coupling The stator is connected without a centering collar on a fl at surface. The
ERN:L of the ECN/EQN/ERN 400 permits versatile mounting, e.g. by its thread provided for fastening it from outside to the motor cover. Dynamic applications require the highest possible natural frequencies f
= 46 min. with D 25 L = 56 min. with D 38 Mounting The rotary encoder is slid by its hollow shaft onto the measured shaft, and the rotor is fastened by two screws or three eccentric clamps. For rotary encoders with hollow through shaft, the rotor can also be fastened at the end opposite to the fl ange. Rotary encoders of the ECN/EQN/ERN 1300 series are particularly well suited for repeated mounting (see brochure titled 400 e.g. with standard stator coupling Hollow through shaft of the system (also see
N General Mechanical Information). Mounting Accessories). This is attained by connecting the shafts on the fl ange side and fastening the coupling by four cap screws or, on the ERN 1000, with special washers (see Natural frequency f ECN/EQN/ERN 400 e.g. with universal stator couplingHollow through shaftGrooves visible Blind hollow shaft
N with coupling fastened by 4 screws Stator couplingCableFlange socket AxialRadial ECN/EQN/ERN StandardUniversal1550 Hz1400 Hz 1500 Hz 1400 Hz1000 Hz 900 Hz ECN/ERN 400 100 1000 Hz– 400 Hz
1) ERN 1000 950 Hz ERN 1000 ECN/EQN/ERN
2) ––
1) Mounting Accessories ).
2) Also when fastening with 2 screws Also when fastening with 2 screws and washersIf the encoder shaft is subject to high loads, for example from friction wheels, pulleys, or sprockets, HEIDENHAIN recommends mounting the ECN/EQN/ ERN 400 with a bearing assembly (see

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