How can I control electromagnet current based on proximity?

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SUMMARY

This discussion focuses on controlling the current to an electromagnet based on the height of an object levitating above it. Participants suggest using light-based sensors as a non-intrusive method for height measurement, with one user mentioning the potential of using an infrared (IR) emitter/detector, although alternatives are encouraged. The conversation emphasizes the need for schematics and sensor recommendations to implement this control effectively.

PREREQUISITES
  • Understanding of electromagnet operation and control mechanisms
  • Familiarity with light-based sensors for distance measurement
  • Basic knowledge of circuit schematics and design
  • Experience with IR emitter/detector technology
NEXT STEPS
  • Research light sensor technologies for height measurement, such as laser distance sensors
  • Explore circuit design for controlling electromagnet current based on sensor input
  • Learn about PID control systems for precise electromagnet current regulation
  • Investigate alternative non-IR sensor options for height detection
USEFUL FOR

Engineers, hobbyists, and researchers interested in electromagnet applications, particularly in levitation systems and automated control mechanisms.

Mazero
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I'm looking for some examples/ideas on how to control the current to an electromagnet based on the height something is levitating above it.

Schematics would be nice, but even any ideas/sensor recommendations would be appreciated.
or any similar application, I've seen something does using an IR emitter/detector but that wouldn't be the best application for this.

Thanks,
 
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Why Not?

You are going to have to measure the height somehow and light is a good and relatively simple way to do that and it in no way disturbs the action
it does not Have to be IR.
Ray
 

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