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Electronics Forum / Basics / October 20061. Frequency of sorts
I had the opportunity to re-hab an old natural gas compressor that had shaken itself apart. I noticed that it used a magnetic pickup on the flywheel to control the engine/flywheel speed. Tiny magnets were mounted in the flywheel with a coil fixed to the compressor base. The machine was monstrous with a Cat engine that had 16 cylinders. My questions are these: How are the pulses used to control speed? Can someone point me to a circuit, similar circuit or article explaining this process. aaa Randy Gross wrote: > I had the opportunity to re-hab an old natural gas compressor that had > shaken itself apart. I noticed that it used a magnetic pickup on the [quoted text clipped - 8 lines] > > aaa That sounds like a magneto ignition system.  SignatureService to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida > Randy Gross wrote: >> [quoted text clipped - 14 lines] > > That sounds like a magneto ignition system. More than likely, that may be the case. I was thinking of a switch controlled by timed dc pulses, say 15 pulses from the magnetic pickup every 10 seconds to maintain a constant 900rpm. The circuit would have to time the pulses accurately and when the pulses drop below 15, turn on a power transistor, control circuitry, etc., to increase speed to 15 pulses per 10 seconds then turn off. Does this circuit sound familiar? Do you know where I can find it or a facimile? Randy Gross wrote: > More than likely, that may be the case. I was thinking of a switch > controlled by timed dc pulses, say 15 pulses from the magnetic pickup every [quoted text clipped - 3 lines] > seconds then turn off. Does this circuit sound familiar? Do you know where I > can find it or a facimile? Who built it? You may luck out and find a manual online. SignatureService to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida > I had the opportunity to re-hab an old natural gas compressor that had > shaken itself apart. I noticed that it used a magnetic pickup on the > flywheel to control the engine/flywheel speed. Tiny magnets were mounted in > the flywheel with a coil fixed to the compressor base. The machine was > monstrous with a Cat engine that had 16 cylinders. Diesel engine? > How are the pulses used to control speed? Can someone point me to a circuit, > similar circuit or article explaining this process. I expect it'd be pretty-much the same as a cruise-control system. Bye. Jasen > I had the opportunity to re-hab an old natural gas compressor that had > shaken itself apart. I noticed that it used a magnetic pickup on the [quoted text clipped - 6 lines] > How are the pulses used to control speed? Can someone point me to a circuit, > similar circuit or article explaining this process. From your description, it sounds like it's got some kind of signal conditioner that cleans up the signal from the coil, then either it counts the interval between pulses, which will directly give you (1/speed), or sends it to a Frequency to Voltage convertor, and the control is analog - in either case, it's fed back to the throttle (or possibly ignition timing circuit, or both, or some other method) to control the speed. Hope This Helps! Rich |
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