JordanCClark
Lifetime Supporting Member
It's a nice find, but an inductive prox likely won't work with the toy cars.btw, I found this recently...
http://www.ebay.com/itm/10pcs-New-L...080?pt=LH_DefaultDomain_0&hash=item4614a50258
What say ?
Let me back up again. I attached an animation from a presentation that I did a few years ago. One is an avi file the other is Shockwave Flash. The swf will play in a browser and automatically loop. The animation is of an inductive prox operation.
Inductive proxes have a coil of wire in the end that is attached to an oscillator. So, an AC signal of some frequency is running through it, making a magnetic field. This is like the science class experiment where you wrap wire around a nail, attach it to a battery and make an electromagnet.
When a metal objectis placed near this magnetic field an electrical current is induced into it (hence the name inductive proximity sensor) and it makes its own magnetic field.
This new magnetic field is in opposition to the original, and reduces the effect, or attenuates the original signal. The sensor circuitry monitors the amount of attenuation and triggers the PLC input.
Not all metals are created equally. Iron (or steel) works the best, but some non-ferrous stuff will work as well. For example, aluminum can get a current induced into it, but at less than half effect. Attached is a chart of correction factors. Most manufacturers tune their circuits to exclude non-ferrous metals, which is why I say that inductive proxes will not likely work for your application.
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