Heidenhain: Incremental Rotary
Encoder ERN 420
Measuring angles with rotary encoders
with integral bearing for mounting by stator coupling
Mounting variants
In rotary encoders with integral
bearing and stator coupling, the graduated disk of the encoder is
connected directly to the shaft to be measured. The scanning unit is
guided on the shaft via ball bearings, supported by the stator coupling. During
angular acceleration of the shaft, the stator coupling must absorb only that
torque resulting from friction in the bearing, thereby minimizing both static
and dynamic measuring error. Moreover, the coupling mounted on the stator
compensates axial motion of the measured shaft. Other benefits of the stator
coupling are:
·
Simple mounting
·
Short overall length
·
High natural frequency of coupling
·
Hollow-through shaft possible
Rotary encoders with integral bearing that are conceived for separate
shaft coupling are designed with a solid shaft. The recommended coupling to the
measured shaft compensates radial and axial tolerances. Angle encoders for
separate shaft couplings permit higher shaft speeds.
Rotary encoders without integral bearing operate without friction.
The two components - the scanning head and the scale disk, drum, or tape - are
adjusted to each other during assembly. The benefits are:
·
Large diameter of hollow shaft
·
For high shaft speeds
·
No additional starting torque
Rotary encoders with integral bearing
HEIDENHAIN ERN, ECN and EQN rotary
encoders with integral bearing and mounted stator coupling are characterized by
simple mounting and short overall length. Possible applications range from
simple measuring tasks to position and speed control on servo drives. The
hollow shaft of these encoders is slid directly onto and fastened to the shaft
to be measured.
ROD, ROC and ROQ rotary
encoders from HEIDENHAIN have their own bearings and are sealed. They are
robust and compact. These encoders are coupled by the rotor to the measured
shaft through a separate coupling that compensates axial motion and
misalignment between the encoder shaft and measured shaft.
ExN 400 Features:
·
Compact dimensions
·
Industrial standard for dimensions and
output signals
·
Housing outside diameter: 58 mm
ERN 420 (ID: 385420-08)
Incremental rotary encoder with integral bearing
for mounting by stator coupling
Line count: 5000
Output signal:
TTL
Max. scanning frequency: 300.00 kHz
Power supply: 5
V (+-10 %)
Coupling version:
Stator coupling for plane
surface (hole circle Ø 63
mm)
Shaft: Blind hollow shaft with
clamping ring, diameter
12 mm, depth 24 mm
Degree of protection:
IP 64 (EN 60529)
Operating temperature:
-40/+100 °C
Electrical connection: free
cable end
Pin configuration:
D294999
Connecting direction:
Cable outlet for axial
and radial use
Included part:
no enclosed part
Cable length:
1.00 m
Please pay attention to the product documentation!
ERN 420 (ID: 385420-44)
Incremental rotary encoder with integral bearing
for mounting by stator coupling
Line count:
5000
Output signal:
TTL
Max. scanning frequency: 300.00 kHz
Power supply: 5
V (+-10 %)
Coupling version:
Stator coupling for plane
surface (hole circle Ø 63
mm)
Shaft:
Hollow through shaft with
clamping ring usable on
both sides, diameter 12
mm
Degree of protection:
IP 64 (EN 60529)
Operating temperature:
-40/+100 °C
Electrical connection:
free cable end
Pin configuration:
D294999
Connecting direction: Cable
outlet for axial
and radial use
Included part:
no enclosed part
Cable length:
1.00 m
Please pay attention to the product documentation!