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Questions tagged [control]

Control refers to systems that control other systems, whether that be industrial machinery, lighting or devices used in a home

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57 views

How to find the critical gain K from the root locus

I am going through Ogata's Discrete-Time Control Systems and working out the following problem found on Page 262. The problem states: Draw root locus diagrams in the \$z\$ plane for the system ...
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3answers
97 views

BLDC motor current sensing for load torque

I would like to control 14V BLDC motor of battery powered drill. What I want to do remake the drill to nut runner (torque wrench), so I need to sense a motor current which is proportional to motor ...
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28 views

Control motor direction with BTS7960

I am using the same BTS but I am controlling it with labview. I am able to control the speed in one direction, even though I have both R PWM and L PWM connected to PWM pins 3 and 7 respectively on my ...
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1answer
85 views

Whats the simplest heating surface for a DIY project

I'm trying to make a very small (3x3 cm or less) cup or surface that will heat to around 200C. The surface needs to be dry and I only care about heating the surface and not any particular volume of ...
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1answer
33 views

Finding coefficients for a PID controller that minimize the integral of the squared error (ISE)

The problem The problem is to find the coefficients for the P, I and D terms of a PID controller used to regulate the object that minimize the the integral of the squared error (ISE): $$Q = \int_0^\...
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67 views

Laplace transform in a block system

I'm trying to understand the resolution of the problem 5.11, but I can't understand how she gets the expression in the rectangle: $$\dot{x}_1=-x_1+2u$$ How can I get the expression in the rectangle?
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77 views

find a point on root locus for specific damping ratio?

I have faced many type of root locus which some of them have curved behavior. I cannot find the poles for my system that has damping ration without using MATLAB. I need somehow to find the ...
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1answer
56 views

finding zeta and wn for a 4th order system?

If we have a 4th order system,such as the one in snapshot, how we can find its undamped natural frequency and damping ratio? Because on wikipedia ,i found case of 2nd order system and couldn't find ...
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54 views

Meaning of “ramp time”?

I have read that ramp means slope but what is the meaning of "ramp time" ? For example,if we have a saw-tooth wave,what will be its ramp time? Please kindly explain with figure/graphics
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1answer
99 views

Is unstable system unstable for ALL inputs?

We define system to be stable if for all bounded inputs, it will give bounded output at all times. But does unstable system means it will have unbounded output for any input? This question is ...
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49 views

Controlling a 12V circuit with a RaspberryPi via PWM

I'm looking to power a 50W 12V heating element via the PWM pin of my Raspberrypi. For this, I have a MOSFET (STP9NB60) and a power supply. Of course this MOSFET's threshold voltage is at least 3V, ...
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28 views

What is the meaning of the singular values?

I am studying MIMO control systems, and I have seen that the Bode plot of these systems is composed by the various singular values. But I have not clear the meaning of these sigular values. What I ...
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25 views

limitations on control effort

I am looking at loop shaping design of a control system, and I'm focusing my attention of the control effort. I have seen that it can be identified with a function called control sensitivity function ...
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24 views

Doubt on how to do well done loop shaping of a control system

I am studying control systems, and I have some arguments that are not clear. In particular I am studying the loop shaping design using H- infinity controller designed with muxed sensitivity, in SISO ...
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1answer
42 views

Difference between Linear control theory and non linear control theory? especially topics/contents wise?

Although I know that a linear systems is the one that follows principle of superposition but I want to know what topics/contents do we study in each of both categories linear control and non linear ...
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2answers
56 views

Confusion regarding root locus. Open loop or close loop?

Which transfer function ,open loop or close loop do we use/need as a pre req to perform root locus analysis? I have also attached a snapshot of the relevant webpage of university of Michigan. I have ...
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1answer
49 views

Effect of zero coefficient in polynomial in Routh Hurwitz?

Consider this polynomial: \$s^4+2s^3+3s^2+4s+5\$ What happens if we have zero in place of any coefficient in our polynomial? Will that indicate that the system is unstable? Let say we have zero ...
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43 views

How to identify branches of root locus from figure/plot?

How can we identify the branches in a root locus For example How many branches do we have in this below root locus(i feel from its appearance to have one branch) And how many branches in this below ...
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82 views

Reading a high-speed rotary encoder with a Raspberry Pi

I'm trying to setup a Raspberry Pi to measure the position and speed of 8 DC motors that all have incremental quadrature encoders. At full speed (unloaded), each encoder ticks at 3.3 kHz. I assume ...
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1answer
66 views

Relation between stability and overshoot?

Is there any relatonship between stability and overshoot? I mean, can we say that a system if it is marginally stable, it will not have overshoot?
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20 views

Problem reading control effort frequency response plot

I am trying to plot the frequency response control effort of a control scheme in Matlab, and in particular I want to do this for different values of tau, which is a constant used to add a pole at high ...
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30 views

Forward path gain

Consider a simple circuit consisting of a pair of wires, where input voltage is equal to output voltage. Here forward path gain is G(s) = 1 ,(fig.1) which gives g(t) = δ(t) {Inverse Laplace ...
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2answers
83 views

How do I find the proper transfer function of this passive filter?

I've been looking at this circuit for a long time trying to derive the transfer function of it. My attempt goes like so. You can separate the circuit into two RC filters, into a system that looks ...
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1answer
37 views

How does a servo amplifier with Step/Dir Interface calculate feed-forward terms?

My Question is related only to servo systems that still use step/dir as input. Consider a typical advanced servo loop of an amplifier in the figure below: (source: "Mechatronics system Control and ...
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34 views

Problem with performances of a control scheme

I am trying to prove with Matlab that if I have an improper system and I place poles at higher and higher frequencies the performances of the system improves. In particular I am considering the ...
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1answer
140 views

Closed Loop System

Why is RC circuit considered closed loop system with negative feedback? Is it because it has a differential equation due to which current 'I' through capacitor 'C' will be C*(dVo/dt) = C*{Vo(t)-Vo(t-h)...
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23 views

Phase control circuit (U111B replacement) for AC motor

I try to repair an old potter's wheel electronic board based on "Phase control circuit" U111B. (An other U111B datasheet here) After changing 60% of components, the PCB is delaminate and I think it's ...
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103 views

How to design analogue compensation for SMPS from Bode Plots?

In a complicated switched mode power supply where the transfer function is unknown, is there a way to design an analogue controller and compensation from the bode plot alone? I am having difficulty ...
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1answer
75 views

Difference between stand alone pid and microcontroller based? Especially in terms of construction and applications? [closed]

My confusion is that what is the difference between a standalone pid controller such as the one shown in below link https://akytec.de/en/trm212.html And a microcontroller/microprocessor programming ...
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24 views

hinfsyn function in MATLAB

I am using hinfsyn to get a controller. I am not able to understand the output CL is a transfer function from what to what? Referring to the diagram in the hinfsyn documentation, is it the transfer ...
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1answer
117 views

Analog PID vs digital PID? [closed]

What is the difference between hardware/standalone pid controller and that implemented in programming using microcontroller? I have also placed below links of two stand alone pid controllers https:/...
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37 views

Design of a controller

I am working on a project that requires me to design a controller knowing the following specifications: "The controller performance must be consistent under varying conditions. The rotor must respond ...
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1answer
39 views

Designing a lead compensation for a 3rd order system

Question Title: Consider the control system shown in Fig.1. Design a compensator such that the unit-step response curve will exhibit maximum overshoot of 25% or less and settling time of 5 sec or ...
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47 views

Linear control vs non linear control?

Do linear control come under category of classical control or non classical control? And simliarly what will be category of non linear control? Will it come under category of classical control or non ...
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1answer
69 views

Effect of zeroes in stability

I thought earlier that zeros have no direct effect on stability but when I read the below article of Wikipedia where it said under the heading "Effect of poles and zeros " It says that adding zeros ...
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18 views

Digital Steady-State Error for a Ramp input [duplicate]

Since the stead-state error is given by: Hence X(z) = G(z)*U(z) where U(z) = (0.2z^-1)/(1-z^-1)^2 Which is the ramp input in Z-domain at Ts=0.2. This would simplify to xss = lim(z->1)[(z^-1)/(1-z^-1)...
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40 views

How to design this estimator?

I have the following problem to solve: I am really at loss of how to design the estimator for such a system and plot the closed loop step response. This is what I have so far in Matlab: ...
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1answer
35 views

Lag compensator vs pi controller?

Although Lag compensator and pi controller have apparently samd function of improving steady state response But how can we decide?which one to use?
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15 views

Lead compensator vs pd controller?

I have already studied that lead compensator is apparently similar to pd controller for both improve transient response But how can we decide?which one to use?
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1answer
39 views

Equivalent compensator of pid controller?

As we know that pi controller is equivalent to lag compensator and pd controller is equivalent to lead compensator, so what will be equivalent of lead-lag compensator?
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1answer
27 views

Low pass filter vs lag compensator?

Is there any difference between a low pass filter and a lag compensator?
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1answer
26 views

Cascade vs series?

Is there any difference between cascade combination and series combination in terms of control system? Or they both same? Since in control system literature,sometimes at some places,we find the word ...
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3answers
81 views

Meaning of “Degrees of Freedom” in control system?

I have been searching google for "degrees of freedom," but it shows results relevant to statistics and physics. I am interested in answers in the context of electrical engineering, especially control ...
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2answers
65 views

Controller vs compensator?

Both these terms: controller(forexample PID controller) and compensator(Lead compensator) are often encountered in control systems,but what is difference between these two? Brain douglas in this ...
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2answers
132 views

Kalman filters(in simple words) [closed]

What are Kalman filters and what are their applications? Please give simple explanation. I have tried studying different links but felt hard to digest/understand
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1answer
34 views

confusion regarding QNET VTOL(Vertical Take off and Landing)

I was reading a manual about QNET VTOL and i came across a block diagram(shown in attached snapshot) In the explaination of diagram, manual writes that The VTOL device is broken down into two ...
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1answer
30 views

4-20mA PLC analog output ground referencing for other devices

I'm currently using a PLC to control an induction heating coil. I'm using a chinese induction driver that allows 4-20mA PID input. This device runs off standard australian 230v AC 50hz. I've ...
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2answers
107 views

Difference between pid controller and on-off controller?

I want to know difference between pid controller and on-off controller especially in regards to the operation of both? The following link gives difference between pid controller and on-off controller ...
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1answer
68 views

Difference between parallel and standard form pid controller in simulink?

What is the difference between parallel and standard form of pid controller that is provided by pidtool in Matlab simulink? In terms of block diagram?
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1answer
77 views

Effect of three PID gains on each other? [closed]

Do the three PID gains - Kp, Ki and Kd relate to each other or are they independent?