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It’s all about performance and safety.
Most AC drives, and some DC drives, are applied without encoders. Most
of the AC drives sold today are for stand alone applications which don’t
require great speed regulator performance or position control such as
common pumps, fans, and compressors. System applications may frequently
benefit from the improved speed and torque regulation performance
available with an encoder.
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An encoder is
generally indicated for the following application situations:
- Best available speed regulation
performance at low speed (less than 10% of base speed)
- Precise positioning requirements (metal
cutting, forming)
- Holding loads stationary under force, load
float (hooks, cranes)
- Highly non-linear load behavior (injection
screws, presses, mixers, gas handlers)
- Operation above base/nameplate motor speed
- Coordination of several drives on a
process line (steel, paper, films, etc.) where precise speed control
and/or draw control are needed.
- Cranes, hoists, mining shovels, people
movers, and other applications which require verification of position
and/or speed for safety.
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