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Engineering
Electrical Engineering
Eddy current position sensor circuit
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[QUOTE="Tom.G, post: 6557910, member: 581973"] This video found by Google, [URL]https://www.google.com/search?&q=bosch+pes6h120[/URL] Also check other links on the youtube page. [MEDIA=youtube]hPA0LxK_G2E[/MEDIA]From the descriptions there and in the video below, I gather that: [list=1] [*] The Red lead of the coil is the center tap, and I suspect the Common [*] One half would be driven with AC (or chopped DC) voltage [*] As the Copper 'Reluctance Loop' moves around the core, it acts as a shorted turn, reducing the voltage induced in the other half of the winding [/list] [MEDIA=youtube]hPA0LxK_G2E[/MEDIA]The circuit you supplied in the first post seems to be variation on the above. It appears to be an oscillator with the frequency dependent on the coil reactance; in other words a position-to-frequency converter. [list=1] [*] The first stage (pins 1&2) is an AC coupled inverting analog amplifier and the second stage (pins 3&4) is acting as an inverting comparator to give logic-level output. [*] With two inversions, there is positive feedback thru the 0.01uF and R[sub]s[/sub] 10K [*] As the Copper loop moves and changes the effective coil inductance (Lx), the tuned circuit composed of L(x) and Cp changes resonant frequency [/list] Anyhow, that's my take on it. Looks like you have some computer work to do if you want to use that pump! Let us know how it goes... and Have Fun! Cheers, Tom [/QUOTE]
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Eddy current position sensor circuit
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