|
Hollow Shaft Encoders |
VS. |
Modular Encoders |
|
Hollow shaft
encoders mount by using a hollow bore into the
encoder which accepts the shaft to be measured and uses an (anti-rotation)
bracket to prevent rotation. |
|
Modular encoders mount in two pieces: the
magnetic rotor mounts
on the shaft and the housing containing the
magnetoresistive sensor bolts to the motor face. |
|
Hollow Shaft vs.
Modular
Durability and Maintenance |
|
– More
vulnerable to damage.
|
VS. |
+
Extremely durable.
|
|
+ Quickest to replace; SMARTach
encoders allow
magnetoresistive sensor replacement without removing the unit.
|
VS. |
– Replacement takes longer, but Avtron THIN-LINE
features make replacement faster than ever before. SMARTach
encoders allow
magnetoresistive sensor replacement without removing the unit.
|
|
Hollow Shaft vs.
Modular
Shaft Considerations |
|
–
Entire weight supported by motor shaft. |
VS. |
+ Most
all weight supported by bolts into motor face. |
|
–
Heavy Mill Duty (weight) models have problems with small shafts. |
VS. |
+ No
problems with small shafts; due to light-weight
magnetic rotor. |
|
–
Have problems with imperfect
stub shafts. |
VS. |
+
Imperfect
stub shafts are handled by Avtron
Wide-Gap
technology;
competitive models may have problems. |
|
–
Requires outboard seals on brake for motor/brake applications. |
VS. |
+ No
extra brake seals required for motor/brake applications; fits between
motor and brake. |
|
–
Fit medium shaft diameters (2.375” maximum M3/M4/M6). |
VS. |
+
Available to fit larger shaft diameters (4.875” maximum M1250). |
|
+ Fit almost any motor style. |
VS. |
–
Require
face or flange mounting on motor. |
|
+ Most
Avtron models have thru-shaft or end-of-shaft capability. |
VS. |
+ Most
Avtron models have thru-shaft or end-of-shaft capability. |
|
+
Tolerate
axial shaft movement well.
|
VS. |
–
Tolerates limited (+/-0.050”)
axial shaft movement.
|
|
Hollow Shaft vs.
Modular
Applications |
|
+
Logical successor to, and replacement for,
foot mounted
encoders. |
VS. |
+
Logical successor to, and replacement for,
flange mounted,
coupled
encoders. |
|
+
Traditionally used on AC motors.
|
VS. |
+
Traditionally used on DC motors, AC use expanding.
|
