Page 737 - Sensors and Systems - North American Catalog
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Rotary Encoders
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Rotary Encoders
Introduction
2.2 Hollow shaft rotary encoders
Hollow shaft encoders use a continuous borehole or a blind hole (recessed
hollow shaft encoder) which houses the drive shaft. Integrated hub and
shaft connections make linking the encoder and the drive simple and easy.
Built-in torque rests compensate for axial misalignment of the encoder and
drive, making a compensating coupling unnecessary.
Advantages of hollow shaft rotary encoders:
•
Simple mounting
•
Easy mounting
2.3 Mounting
Clamping flange
This encoder can be mounted using the clamping flange, which ensures
that the rotational axis is centered. The threaded holes on the encoder face
can also be used.
Servo flange (synchro flange)
This encoder can be mounted using the synchro groove with mounting
components, by using the threaded holes on the encoder face, or by using
a mounting bracket.
Hollow shaft rotary encoder
Hollow shaft rotary encoders have a thru-hole for the drive shaft.
With hollow shaft encoders, the shaft and hub connection is already
integrated, but it is vital to mount the encoder so that the correct torque is
transmitted to the drive shaft and not to the body of the encoder. Typically,
hollow shaft encoders are mounted in such a way that the weight of the
encoder is placed on the drive shaft, while a pin securing the body of the
encoder prevents it from rotating around the drive shaft as torque is applied.
Encoder motion should not be restricted in any other way, as it could affect
the accuracy of the encoder.
Rotary encoder with recessed hollow shaft
Recessed hollow shaft encoders are identical in all ways to standard hollow
shaft encoders except that the hole is bored only partly through the encoder
housing. Mounting techniques for recessed encoders are also the same.
