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[...] needs 1200 rpm to hold 240vac.the circuit I was working on was pluged into the gen output of 120vac.
Then rectified to pulse 5v dc then filtered with a cap 1uf then this voltage was hooked up to a 555 timer circuit with my signal volts adjusted to 1.6v reference for servo motor to nutrual position. When load changes or rpm goes up or down the circuit was supposed to drive the servo so it would increase and decrease carbi.Thats about as easy as I can explain. But just couldnt get it stable it was all over the place moving the servo arm.
Hi,Quote from: wheelyneil on September 14, 2009, 10:12:02 PM[...] needs 1200 rpm to hold 240vac.the circuit I was working on was plug ed into the gen output of 120vac.Are we talking 240V or 120V?240v max output but using 120v for circuit Vcc down to 5 vdcQuote from: wheelyneil on September 14, 2009, 10:12:02 PMThen rectified to pulse 5v dc then filtered with a cap 1uf then this voltage was hooked up to a 555 timer circuit with my signal volts adjusted to 1.6v reference for servo motor to nutrual position. When load changes or rpm goes up or down the circuit was supposed to drive the servo so it would increase and decrease carbi.Thats about as easy as I can explain. But just couldn't get it stable it was all over the place moving the servo arm.Either the sensing was erratic (due to noise and transients), or perhaps the regulation loop was continuously overshooting - probably a bit of each.For the speed sensingYou could either tap the generator for a signal, take it through a voltage divider and then through a pulse former to get a clean and predictable pulse train at the frequency of the generator.Or...Make an infrared sensor to read a disk (or the pulley in front) painted with black and white sections.When you have the pulses proportional to engine speed, you can either use them like that using a microcontroller or you can integrate the signal to get a signal for an analog circuit.Then drive the servo, a DC motor or whatever with a circuit that regulates relative to the error signal (i.e. the absolute difference between the wanted speed and the instantaneous speed, like the "P" (for proportional) in a PID control, or something similar. IOW, if the difference is large, a large regulation is in order, when the difference is small, the regulation must be small as well.Hope this makes sense to you.
[...] needs 1200 rpm to hold 240vac.the circuit I was working on was plug ed into the gen output of 120vac.
Then rectified to pulse 5v dc then filtered with a cap 1uf then this voltage was hooked up to a 555 timer circuit with my signal volts adjusted to 1.6v reference for servo motor to nutrual position. When load changes or rpm goes up or down the circuit was supposed to drive the servo so it would increase and decrease carbi.Thats about as easy as I can explain. But just couldn't get it stable it was all over the place moving the servo arm.
Hello and thanks for responding,First off I live in the USA our electric is on 60hz -my gen is 6 pole and needs 1200 rpm to hold 240vac.the circuit I was working on was pluged into the gen output of 120vac. Then rectified to pulse 5v dc then filtered with a cap 1uf then this voltage was hooked up to a 555 timer circuit with my signal volts adjusted to 1.6v reference for servo motor to nutrual position. When load changes or rpm goes up or down the circuit was supposed to drive the servo so it would increase and decrease carbi.Thats about as easy as I can explain. But just couldnt get it stable it was all over the place moving the servo arm.ThanksNeil
As I am sure you are learning, this forum can be an unfriendly place. Good luck with your project. I looked at the video and pictures. looks interesting.
Hi,Does your motor have a magnetic pick-up (Hall switch) allready?If so, it is possible to tap the signal from that.It does have a hall effect ignition just like the picture here.
I would think that one of the robot guys could come up with something to govern a V8 engine that anyone could build at home.
Hi,Take a look at this: http://That.Homepage.dk/PDF/Speed_Governor.pdf and tell me if you are able to build this.
it wasn't a snotty comment, it was experience. way too many people want you to design a 30 node wirelress mesh with a RADIUS server and VPN and can you have that by noon, I'm kinda busy here. just nip that in the bud.
[..] I guess I should have looked closer at the circuit. Do you have the missing values for some of the resistors and caps and op amps ECT?
- What magnitude of voltage does the Hall device give (5V/12V/Other)? I was waiting to buy one to fit spec's on desighn.