# Questions tagged [control-system]

A system that may be electronic circuits or even software that uses control theory (principally differential equations) to control an output by monitoring various aspects of the system under control and varying inputs all towards meeting a defined goal. Some famous examples are controlling a rockets thrust angle to ensure directional control.

789 questions
Filter by
Sorted by
Tagged with
243 views

### design of compensator type 2 for current mode control of boost converter?

I have designed boost converter with Peak current mode control in PLECS. I have used the method of k factor approach to design the compensator. the bode plot transfer function of the power stage is ...
2k views

### Approximation of second order system, by step response

I am trying to aproximate a transfer function of a system. The system is a linear actuator, connected to a feedback potentiometer. The following figure is a step respons, with 24 V as input, and the ...
319 views

### Why linearise around an equilibrium point?

In the control theory dealt in class I was taught to always linearise a nonlinear system around an equilibrium point, i.e., where $$\dot x = 0$$ However, linearization is a Taylor series expansion, ...
60 views

### How to go about determing the System Type of my setup?

I have a small project where I am PID tuning two servo motors. Something very similar to this: I am interested in finding the system type of the above setup, which includes the PID loop I have tuned. ...
102 views

### Help with identifying a transfer function - with neuroscience application

This is a question for you electrical network engineers. The problem has arisen in a neuroscience study I am working on, but I hope to be able to glean some insight from other domains that deal with ...
123 views

### Gain of proportional Controller with distubance $sin(10t)$

The diagram below represents the position of ocean oil platform system which use the proportional controller with gain $k$. The output $x(s)$ is the platform deflection regards the position ...
85 views

### Pole-placement problem

I was following this example of implementing a pole-placement with an Integral controller. Matrices A_star=[-5 -3 0;1 0 0;0 -1 0] B_star=[1;0;0] desired poles -100,-8+i*11,-8-i*11 I know the ...
909 views

### Why is phase margin considered more important than gain margin in dc-dc converters?

Control theory text books say both gain margin and phase margin give information about relative stability. These quantities also give an idea about the corresponding closed loop system's transient ...
62 views

### What does asymptotic stability mean ? and can a system have lower than 90deg of phase margin and still be stable?

why bode stability criteria dictates 90deg of phase margin ? my understanding is that it is so when a system is cascaded with another there's a margin so the phase doesn't get to 180 and over, am i ...
126 views

### How can infer instability from the frequency response of control system?

When can we judge a control system to be unstable from its frequency response?.For example, thermostat computes the error signal (desired room temperature - actual room temperature) and then actuates ...
171 views

### PR controller electrical circuit

I am attempting to design a PR control feedback loop for a grid tie inverter. The math checks out but I can't seem to convert the transfer function and/or block diagram into an actual electrical ...
613 views

344 views

### Effects of feedback

After doing some exercises in control theory I realized that one don't really need feedback to fulfill a lot of specifications. One could in principal introduce a controller giving us stability etc ...
150 views

### Difference between compensation and using a PID contoller?

I have a hard time understanding the differnce between the two techniques that are introduces in my textbook, a PID controller and Lead/Lag compensation. Ultimately we add a new box to our "loop" and ...
81 views

293 views

### Is a decoupling capacitor theoretically required across the supply pins of a Hall sensor?

I am using the Hall-effect sensor OPTEK 3075S to ensure every step commanded to a stepper motor is executed. In the datasheet, they recommend connecting a 100nF capacitor across he input pins for "...
78 views

### Characterizing a magnetic levitiation system

I've been banging my head on this project for a while and need some guidance. It is a magnetic levitation device that is used in control theory class. I've never taken the class so have been trying to ...
59 views

### What to do with PI feedback value

I've been studying and trying to implement a PI feedback controller for a BLDC. Right now, just to unit test the code for the PI controller, I'm driving two phases with a PWM signal on a MOSFET ...
3k views

### Using of matrices in simulink block diagrams

All simulations I've done in simulink as yet have not matrix in their block diagram like the following picture : and they have block diagram structure like : for simulating a system that has ...
114 views

### Reduce time to stable value in PID

I am working with PID controlled temperature controller (SELEC TC544) . I have set P = 5 / I = 0 / D = 3. System get long time to stable at my set point. How to reduce that time?
591 views

### Control loop for finding maximum value [closed]

I'm trying to build a control system which I control variable x with a feedback y, goal is to find the maximum value of ...
975 views

### Controlling a dc-motor by keeping electrical power input constant

I have seen dc-motors controlled by current control and rpm control. As I understand it, one could use a PWM for example to control the mean current of a motor while measuring it and therefore keeping ...
70 views

### Control Systems

How to solve the following question? For a unity feedback control system with a forward-path transfer function G(s)=16/s(s+a), design the value of 'a' to yield a closed-loop step response that has 5% ...

1
ā¦
5 6
7
8 9
ā¦
16