689
Rotary Encoders
4
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2.2
Hollow shaft rotary encoders
The rotary encoder shaft for this design has either a thru-hole or a blind
hole (rotary encoder with recessed hollow shaft).
The rotary encoder and drive can be connected easily via the integrated
shaft and hub connection.
Hollow shaft rotary encoders have an integrated or attached torque rest
that compensates an axle offset of the rotary encoder and drive. Coupling
is unnecessary in this case.
Advantages of hollow shaft rotary encoders:
•
Compact system of motor and encoder
•
Easy mounting
Disadvantages of hollow shaft rotary encoders:
•
Complex internal structure
2.3
Mounting
Clamping flange
This type of flange enables the rotary encoder to be
•
mounted on the clamping flange with simultaneous centering of the
rotational axis (mounting bracket), or
•
mounted on the existing front-face threads.
Servo flange
This type of flange enables the rotary encoder to be
•
fixed to the servo groove of the rotary encoder using mounting
clamps, or
•
screwed to existing front-face threads, or
•
mounted using a mounting bell.
Hollow shaft rotary encoder
Hollow shaft rotary encoders have a thru-hole for the drive shaft.
The shaft and hub connection is already integrated in these rotary en-
coders. It must simply be ensured that the torque is transferred correctly.
A simple and cost-effective option for this is the integrated torque rest.
With this type of mounting, the drive shaft bears the weight of the rotary
encoder. The inclusion of a pin on the periphery of the rotary encoder
prevents rotation about the hollow shaft. All other levels of freedom must
not be restricted.
Rotary encoder with recessed hollow shaft
Rotary encoders with recessed hollow shaft offer the same functionality
as the hollow shaft rotary encoders described above. However, in con-
trast to the hollow shaft rotary encoders, they have a blind hole.
Introduction