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lm12 is 80watt op-amp. it's suitable for analog motion controllers. There's a diagram of analog pid controller "modern control systems". You can design pid contoller with only 3 op-amps. For motion control applications you need frequency to voltage converter. You should convert tachometer signals to linear signal.
I did get the file from a friend and I found it great and useful so I uploaded it to the e-books section of the site. Now it seams like that section is gone (was a great resource)
I also noticed that the same document was out on the internet with another filename, but I can not find back to that place then the link was a reply to my post in e-book section and google gives nothing... So if anyone find it somewhere else, pleas give the link again, until then the file is attache to this post.
The file is a 12p labnoat about an analog PID position controller for a DC motor. It explains the P, I and D part of it and has a chematics.
Tried to "see www.people.fas.harvard.edu/~thayes/phys123/lb11PID_oct02.pdf", but it says:
You don't have permission to access /~thayes/phys123/lb11PID_oct02.pdf on this server.
So maybe you'll show it to us.
Making the analog PID circuit, isn't difficult.It's just a piece of cake.You can make the general PID circuit in which Kp,Ki and Kd gains can be set by potentiometer.What more important is where your system gets stable.How will you find the gains for proprotional,intergral and derivative controller?What more important is, as how will PID circuit gets the feedback signal.Will you use some sensor? Calibration of sensor is also important in PID circuit, especially with Reference signal for PID controller.
hey, i need help in determine the physical parameters such as damping ratio(b), moment inertia of rotor(J), electromotive force constant (Km), electric resistance (R) and electric inductance (L) of an actual motor.
this parameters is what mentioned in ee562bkkosh.rar.
Rougly speaking on this one.You need to have two potentiometers for this.One rotary potentiometer, which will be attach to your motor.The other potentiometer is the one by which you control it's angle.
How this will work
You change resistance of potentiometer(control angle), for example you set it to 100Ohms, then the motor will also move in order to set 100Ohms of rotary potentiometer.
So resistance of two potentiometer will always try to be the same.
The resistance actually reflects the angle in position control.I assume you are talking about angular position control of DC motor.
So what will your PI controller would do.Your PI controller would try to keep the two resistance equals to each other.It keeps on moving the motor right in accroding with your potentiometer control angle.
If you need more help on it.I can help you make a circuit of DC motor position controller from scratch.