Page 5 - Avtron Encoders Catalog

ENCODER SELECTION & TECHNOLOGY
ULTRA-DURABLE SENSORS
Depending on on on on the the needs and and construction of the the application we use optical and and magnetic sensor technologies to generate the signals in our encoders Follow this approach when selecting to ensure that you you are focusing on on on the right solution for your application 1 Determine your signal needs: Incremental or Absolute
2 Consider Consider mechanical mounting requirements 3 Consider Consider environmental factors
MAGNETIC - - vs - - OPTICAL MAGNETIC OPTICAL Rotary Drum
Magnetic Poles
Magnetic Sensor
Electric Signal
Rotary Disk
LED
Stationary Disk
Photo-cell Electric Signal
Rotation
Rotation
Incremental encoders create a a a a a a a a a a series of square wave pulses to represent the the measured motion Each incremental pulse pulse is is the the the the same The principal difference lies in in in in in the the the electrical characteristics of the the the line driver namely:
HTL (5V-24V in/out) TTL (5V-out 24V-in/5V-out)
Most incremental Avtron Encoders include a a a a a a a a once-per-turn marker pulse pulse Only
by measuring from a a a a a a a a a a a starting position position and keeping track of of the number of of pulses observed can incremental incremental encoders encoders be be used used to to measure measure position position Therefore most incremental incremental encoders encoders are used used to to measure measure and control velocity Look for our incremental models with high-power fully short-circuit protected protected outputs These encoders can drive the the longest cables yet they are protected protected from wiring errors Our incremental magnetic sensor technology enables Nidec to to completely embed all the the electronics in in in in a a a a a a a a a a solid brick of potting material making them impervious to to dirt dust oil and water Absolute
encoders create a a a a a a a a a digital message to to represent a a a a a a a a a position which is sent sent to to the controller There are a a a a a a a a a a a a a huge number of communication output options for absolute encoders and Nidec has industry-leading coverage The absolute position information is retained by the encoder encoder regardless of power interruptions Absolute
encoder encoder encoder messages typically have small communication- related delays which could affect velocity control control Therefore most absolute encoders are used to measure and control control position Nidec features a a a a a a a a number of key innovations in in in in our absolute encoders encoders including Wiegand wire technology and and solid state memory to enable multi-turn encoders encoders without unreliable fragile glass disks optical sensors gears batteries or or or or super- capacitors Our industry-first severe duty absolute encoders include huge bearings and seals for maximum durability THE THE MOST RELIABLE ENCODERS ENCODERS IN THE THE WORLD
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