Encoders
What are the main components of an optical encoder
Led (Scanning unit), "Opaque transparent" disk
Please describe the optical scanning system
Led emit light through the "opaque transparent" disk, which convert the led signal into sin-cos or train pulse signal a the output of the encoder
What is an incremental encoder?
Provides speed and direction of rotation (position after being referenced) Position is lost after after power failure
What is an absolute encoder?
Provides unique code of the position on each step performed within one turn Position is NOT lost after power failure
What is the main task and function of an encoder?
1. To convert mechanical motion into electric signals 2. Detecting Angular or linear position, speed and direction
Please call the typical mechanical interface
Face mounting flange Servo flange Blind Hollow shaft Through hollow shaft
Why do incremental encoders have two output channels
For redundance purposes, being sure that the position travelled by the system is exactly the same as the position at the output of the encoder
What is the function of the Zero (C) Pulse?
For reference purposes
Where are encoders used?
OEM and End Users (Print, Motion and Drives, Handling, Food & Beverage, Pharma, Packaging)
What are the advantages and the disadvantages of optical and magnetic
Optical: Adv - Resolution and Speed (up to 12kRPM) Dis - Weak Construction Magnetic: Adv - Robustness and Price Dis - Size and Low flexibility
What is the benefit of an absolute encoder
Position retained after power failure, quick start-up of the system
What is the benefit of an incremental encoder
Simpler signal at the output of the encoder Cheaper than absolute encoder
Please describe the magnetic scanning system
The magnetic sensors built into the encoder detects the position of the encoder and generate the output based on yours sin and cos signals