PPT Slide
LVDT - Linear Variable Differenctial Transformer
Three winding coupled with a movable magnetic core
Magnitude and phase of the output is controlled by the position of the core
Encoders - Incremental and Absolute
Most are optical using laser, incandesent lamps, or leds
Incremental have no home position and measure only change in values
Incremental require more internal electronics
Absolute measure exact position.
Absolute are large and expensive for fine position control
Absolute do not require any conversion for digital output
How can you tell the direction that the encoders turning?