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

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Control Theorie: Drawing Transition Matrix Trajectories

Given a transition matrix like e.g. $$ \phi(t)=\begin{bmatrix} e^{-3t} & 0 \\ 0 & e^{-3t} \end{bmatrix} $$ What is the analytical way of drawing x(t) for two given starting points? I only ...
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10answers
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Heating a tube of aluminium electrically

I need to regulate the temperature of the surface of a tube of aluminium. The tube is used as a mandrel for composite molding/curing, so the target temperature is below 100C. Currently, there is no ...
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3answers
70 views

How to turn on/off a converter using OpAmps

I am designing a controller board for turning a DC/DC Converter on when the voltage level is below 24, and turn it off when it's above 29. With this circuitry I'll be turning it off above 29V. I can ...
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2answers
73 views

Cascaded current control

I have a actuator capable of measuring motor current and position via an encoder on the output shaft. The motor is a brushed DC motor running through a gearbox. My questions is in regards to the use ...
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1answer
73 views

Can anyone identify the IC for LED controller in the picture?

Recently my LED surgical light has been having a problem with its controller. I opened the controller and found this board with two ICs: One is a Shift Register (74HC595) and the other has no markings....
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2answers
49 views

Is this a ac three phase motor with a dynamic braking control?

I am an electrical apprentice and this question popped up on my exam, and then again on an exam under a different topic, and I have to review it. What type of motor control is this? note: I ...
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2answers
76 views

What is the recommended way for starting an ac induction motor with a VFD?

I am designing a control strategy for an AC(induction) 3-phase motor fan in an HVAC air handling unit for pressure control inside the ductwork. The plan is to use a PID algorithm for the pressure ...
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1answer
57 views

2n2222 transistor control motor from raspberry

I'm new and i know almost nothing about electronics (i'm a programmer). I have to control a DC motor by using a transistor with a PWM pulse given by my raspberry. This is the scheme i thought about, ...
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48 views

Losing Control over 130 DC Motor via L298D

I have been trying to control a 130 DC motor via L298D through encoders and decoders. Here is a schematic of the connections I have made The Transmitter Circuit: and the receiver circuit : With ...
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1answer
53 views

5mm RGB Led built in IC [closed]

Is there any standalone IC do the same job this 5mm Led (standalone flasher and builtin control IC) does?
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0answers
113 views

Sensorless FOC position observer error

I am designing my own FOC (field oriented control) system, and I am trying to implement sensorless control. I have successfully implemented sensored FOC with my system on two different motors using ...
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2answers
116 views

two tanks control problem [closed]

I have been trying to solve this problem for months now. I work as an Electrical Engineer in a tunnel project, we will use TBM machine to drill the underground station. We have two tanks in TBM for ...
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1answer
28 views

Solid State Variable AC

At work I often need a variable AC source and I usually use a large variable transformer which gives me anywhere from 1 to 300VAC. I do a lot of testing and was looking for methods to control the AC ...
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1answer
69 views

Discretizing a PID controller

I am discretizing the PID equation so we have this equation Now if we separate the integral term we get Applying backward euler method Now as we already have a differentiation , by applying ...
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1answer
144 views

Can somebody explain how this circuit works?

I have the following circuit implemented in the control of a thyristor. I know the basic functionality of the circuit, but i need a complete description of every component. Thank you!
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0answers
23 views

Why is it always the odd row that becomes zero in the routh hurwitz array?

A row becomes zero when a purely even or purely odd function is a factor of the characteristic equation. A purely odd function is just a purely even function multiplied by s. $$ q(s) = s^5 + 4s^3+ ...
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1answer
42 views

Relation between dash pot and spring in forces when extracting a transfer function [closed]

If a spring load some energy and use it for opposing other forces, and a dash pot has a friction, physically the both shouldn't have the same force-displacement equation ? In most of dash pots, we ...
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3answers
65 views

Controlling motor speed with PID how to scale PWM to RPM and back

I want to control the speed of a motor using PID controller. My problem is, the valid PWM range I can set in my microcontroller is from 0 to 199 but I measure the speed of the motor (using an encoder) ...
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2answers
86 views

Using mesh analysis to get the transfer function of electrical system

I am studying the book: Control system engineering for Norman S Nise. I left the college few years ago, and I forgot lots of thing about Kirchhof's laws (Voltage and current). I tried to solve the ...
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1answer
43 views

How to I go from generalized Transfer Function to generalized State Space, and back?

Question: How can I transform a generalized Transfer Function a generalized state space form (preferable with the First Companion Form), and back? For the sake of presenting an example, let us say ...
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1answer
81 views

Root locus for an open loop transfer function?

The function, rlocus(), in MATLAB is used for closed loop system roots for variation in gain K. However, I am curious if there is a similar function for variation ...
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1answer
68 views

Solving the differential equation in control system engineering

While I am continuing my studies of the Norman S. Nise book about Control System Engineering, and while trying to solve exercises of chapter 1, I noticed that I am out of the scope of solving ...
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1answer
37 views

Create repeated pole/zero in transfer function---Octave

Say I have such a transfer function with a repeated zero $$ \frac{s^2}{s+2} $$ How do I enter this in Octave as a transfer function? Perhaps this question applies to Matlab as well. If the zero was ...
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2answers
63 views

The Electronics Involved in Instruction Fetching [closed]

I would like to know how the instruction cycle works at an electronics level. I am new to electronics. In order to limit the scope of this question, I am just focusing on the first step of the cycle, ...
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4answers
125 views

How Specifically the Control Unit (CU) Works

I am a software developer now interested in the electronic implementation of computers. When I think about computers, the thing performing the action is the "processor". But the processor is ...
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0answers
50 views

Independently scaling the max/min readings of an analog sensor?

I'm currently working on a project that entails reading an analog signal with an AVR microcontroller and using it to control the brightness of some string LEDs. The signal is generated by a ...
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1answer
47 views

Connect DAC IC to current sinking controller

I want to supply a 0-5V signal to this process controller using the DAC8555. The DAC8555 datasheet states: Each output buffer amplifier is capable of [...] driving a load of 2kΩ in parallel with ...
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1answer
42 views

What's oscillatory instability in the delay differential equations?

Does DDE’s stability depend on forcing term and ODE’s stability does not depend?If yes, then is frequency analysis of stability applicable only to DDE and not ODE? In control systems, we study ...
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1answer
66 views

how to obtain the parameters of the step response within matlab in open loop?

I have step response in open loop of my model that i stored in workspace and I want to use Matlab to obtain the: T time constant, L dead time and A (see figure below).is there a command for that like ...
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1answer
27 views

step response data extraction from response data of a model(simulink)?

I want to design a PID controller with the step response method, so I needed to save the step response of my model in simulink in workspace (Vout) with saved format :structure wih time, I exctracted ...
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0answers
48 views

Why not detecting zero crossing of the back EMFs in BLDC by software?

I am reading about the state-of-the-art approaches to detect the zero crossing of the back (trapezoidal) EMFs on a 3-phase BLDC for sensorless control. Even digitally implemented, they use various ...
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0answers
40 views

Multiple 3-PH Inverter Control from MCU

It's been a while and in need of some guidance please: I have 3 inverters controlling motors via remote potentiometers. Each of the inverters uses it's own galvanically isolated internal switch mode ...
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4answers
126 views

How to find the system response given the transfer function without using Laplace transforms?

The given transfer function is: $$\frac{6p+100}{p^2+12p+100}$$ and inputted into the system is a unit step response: $$r(t) = \left\{\begin{array} f0 & t < 0\\1 & t > 0 \end{array}\...
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1answer
94 views

Op-amp control theory

back at it again trying to use your genius brains. I have been trying to teach myself audio amplifier design. The big road block I am getting into is the control theory part of it, meaning how does ...
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2answers
123 views

Octave pzmap: format poles and zeros

This question is linked to this one: Octave rlocus: format ploles and zero I am using the Octave command pzmap but the size of the markers of the poles and zeros ...
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1answer
58 views

neural network to simplify induction motor control [closed]

I will be working this summer on a paper about applying AI algorithms in control theory, i think induction motor control is a very interesting topic and i have found some papers about applying ...
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1answer
79 views

How to make sure a clocked operation happens just once in Vhdl

title may be a bit confusing but what I try to do is to take data from ram/modify it and put that data back to the ram. I want all of this to happen just for the operation(Brightness/Contrast) time ...
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1answer
49 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. ...
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2answers
85 views

Octave rlocus: format ploles and zero

I would like to make a rlocus plot with Octave. The problem is that the poles and zeros in ...
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0answers
17 views

Reason for parametric variation in a power system

Let us take an example of a single area power system consisting of a governor, noon-reheated turbine, load and machine, droop characteristics. It is written in the literature that ...
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1answer
243 views

Implementing line propagation delay compensation for BiSS master in software

Following up on a question I asked some time ago: Simple Implementation of BiSS C interface for a position encoder. I have implemented a simple BiSS master (point to point) to communicate with an ...
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1answer
43 views

Controling where sound goes (darlington array)

source of sound (dealing with multiple sources) and six speakers. I want to control to which the sound goes. The system has a DC offset with both sides of the wave within positive range Question is ...
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0answers
27 views

Uniform Stability of a linear system

For the system $$ \dot{x}(t) = A(t)x(t),\quad x(t_0) = x_0\quad (1)$$ we say it's uniformly stable if $$\exists \gamma : ||x(t)|| \leq \gamma ||x_0||\quad t \geq t_0\quad \forall t_0,x_0$$ However, ...
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0answers
53 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 ...
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1answer
40 views

Controller/Observer Canonical Forms

Given $$ G(s) = \frac{1}{(s+1)^2} $$ how do I come up with the following time-invariant realizations? 1) Controllable but not observable 2) Not controllable but observable 3) Neither controllable nor ...
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1answer
34 views

Transfer function for controllable part of a linear system

I understand that for my linear system $$ \dot{x} = Ax + Bu ;\quad y = Cx$$ the transfer function expression $$ C(sI-A)^{-1}B = C_c(sI-\hat{A_{11}})^{-1}\hat{B_{11}} $$ where the latter exposes the ...
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1answer
33 views

Stabilizability as a weaker notion

I'm having trouble understanding why stabilizability is weaker than controllability and whereas the latter implies the former, the converse isn't true. Thanks for your inputs.
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Remote controlled relay with override design

I have designed a circuit to control the mains that works but I'd like to add an override functionality to it and I can think of a few ways to do that but I was wondering if anyone out there had a ...
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1answer
69 views

Why simulink step response differs from matlab's step function?

step response is different in simulink showing oscillatory behavior unlike in matlab step function Transfer function Step response Block diagram in simulink Simulink scope
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2answers
58 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 ...