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Explanation of Specifications |
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page 1 of 2 
| Mounting of Rotary Encoders with Stator Coupling | ||||||||||||||||||
ERN/ECN/EQN
absolute rotary encoders have integral bearings and externally
mounted stator couplings. Their shaft is directly connected to the
shaft to be measured. During angular acceleration of the shaft, the
stator coupling carries only that torque resulting from friction in
the bearing. In this way, the stator coupling compensates radial
runout and misalignment without significantly reducing accuracy. The
externally mounted stator coupling tolerates axial motion in the
drive shaft up to:
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| Mounting Procedure | ||||||||||||||||||
| The mounting
procedure is very simple: The encoder shaft is slid onto the drive shaft and fastened with two screws and eccentric clamps on the flange side of the encoder. Short shaft ends can be fastened on the flange side of the encoder; with hollow-shaft encoders and long shaft ends, the shaft can be fastened on the housing side. Rotary encoders of the ERN/ECN/EQN 1300 series with mounted stator coupling and taper shaft are particularly well suited for repeated mounting (see brochure entitled Position Encoders for Servo Drives). The stator is connected without a centering collar on a flat surface. For dynamic applications such as servo motors, it is recommended that the shaft be fastened at the flange and the coupling be fastened with four cap screws or, for the ERN 1000, with special washers (see Mounting Accessories) to attain the highest possible natural frequency fN of the system.
* See also Explanation of Specifications |
ERN/ECN/EQN 400, ERN 1000: with blind hollow shaft  ERN/ECN/EQN 400: through hollow shaft  ERN/ECN 100:  |
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| Dimension diagrams | ||||||||||||||||||
| ERN/ECN/EQN 400, ERN 1000: with blind hollow shaft |
ERN/ECN 100: | |||||||||||||||||
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| ERN/ECN/EQN 400: through hollow shaft |
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