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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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Determining control voltage of variable gain amplifier to achieve fixed output amplitude

I am wondering if there are any well known methods for determining the control voltage of a variable gain amplifier required to achieve a constant amplitude output without requiring prior knowledge of ...
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2answers
53 views

555 timer circuitry

I have a 555 pulse generator controlling a relay going a little faster than 1hz. It is hooked up to start up when it receives positive voltage from the switched accessory circuit of a vehicle. That ...
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1answer
26 views

Boost converter control in DCM

I am trying to find a reference where a boost converter is controlled in discontinuous conduction mode (DCM) with constant duty cycle and by changing the frequency of operation. More specifically, I ...
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29 views

0-10v Lighting Control Test Rig for Lighting Control Systems - How to source 10vdc at 2mA?

If this has been asked previously, I have not yet found it. I've never posted here, so please accept my apologies in advance if this post isn't appropriately written. I'm building a test rig for ...
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0answers
64 views

Modeling scalar control of PMSM

I have met with a scalar control algorithm for a permanent magnet synchronous motor. I haven´t heard about it before so I decided to develop a dynamic model to further analyze this control algorithm. ...
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2answers
78 views

The Blue LED of ESP8266 glows continuously when connected to 5V relay output

I am a newbie. Need help on my project. I am building a project which controls a 5V relay from ESP8266 ESP-01. Since the GPIO2 gives the output of 3.3V, I am using an N channel MOSFET 2N7000 to ...
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3answers
80 views

dc voltage control for LED lights?

I'm looking for a little bit of help on a project I'm working on. I need to find some way to make led light bars (18w and 120w) to automatically start out dim and gradually brighten to full ...
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0answers
128 views

1. order system Gain

I have been assigned a task and I am having trouble finding the gain K. Here is the task: To the time t = 0, there is put a step at 3. Find the gain. Find the time constant. Find the time delay. ...
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1answer
46 views

Calculate torque from current induced in a single phase of a 3 phase AC Induction servo motor

I'm looking to measure the torque or slip angle on an AC induction (asynchronous) servo motor given the current induced in one of its phases. The servo and drive is yaskawa. Example data is shown ...
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6answers
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In earlier tape recorders, how was tape spool angular velocity adjusted?

Tape recorders that use spools of magnetic tape transfer the tape from one spool to another as the tape plays/records. The spool with less tape must be rotated faster than the other. Here is such a ...
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0answers
31 views

How to compare power requirements for different control design approaches?

I am trying to fairly compare different control design approaches. As an example, below I present two similar but different techniques which are: Control system with state feedback Control system ...
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0answers
53 views

PI or PID vs Manual Controller design using Control theory

Why should we design a controller manually using Bode plots and control theory instead of using PI or PID controllers and tune them? Or more specifically when should I design a controller and when ...
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1answer
41 views

PI controller - DC voltage regulation

I a voltage source converter, in order to control the DC-Bus voltage a PI controller can be used. The control method is illustrated in the figure below: I would like to ask why the input of the PI ...
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37 views

How does a time delay affect the Gain and Phase Margin?

How does a time delay affect the gain and phase margin. Answers using nyquist plots would be helpful I know that a time delay of t corresponds to gain multiplying by 1 and phase subtracting omega*T . ...
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1answer
48 views

Constructing bode plot from experimental data and constructing a transfer function

I've been trying for a few days to convert an experimentally obtained (frequency against magnitude and frequency against phase) graphs to a bode plot and then construct a transfer function from the ...
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0answers
301 views

What is causing this long tail in the transient reponse?

I have a fifth order transfer function for which I designed a controller using pole-zero cancellation technique on a root locus. I am after <5% overshoot and <2s settling time. Currently, ...
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1answer
50 views

Can a system have constant phase response other than +/- 90 deg (and multiples)?

I have seen frequency responses where amplitude response is constant( pure delay) and where phase response is constant(pure integrator). In an integrator the constant phase is -90 deg. In a pure ...
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3answers
97 views

Not sure how to go from PID error to PWM duty

I am trying to learn the basics of PID. I have made a contraption to try to implement a PID controller. I am not using carbon fiber, but rather a chopstick. So I am controlling the speed of the ...
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2answers
43 views

Digital control of contactors

We are trying to control a bunch of 3 phase contactors using an HMI. The contactors' coils are activated by two lines of the 240V 3 phase source (L1 and L2). We are trying to figure out if the ...
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1answer
216 views

Pole Zero Cancellation on a Root Locus

Question: ...design a controller in the feedforward path to minimise the effects of the two pairs of dominant poles. Use a pole-zero cancellation technique on a root locus diagram.... I have a 5th ...
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2answers
91 views

Stability at loop gain <1 and 180 degree phase shift

I'm reading this article about stability of OpAmps: Link to article. It says: "If Aβ is less than unity at the high frequencies where phase shift reaches 180°, the high-frequency phase-shifted ...
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0answers
92 views

How to use the Root Locus design method to improve the transient response of my system?

By closing the loop, I need to design a controller in the feedforward path to minimise the effects of the two pairs of dominant poles of the 5th order transfer function. Use a pole-zero cancellation ...
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1answer
57 views

rlocus() - Not enough input arguments in MATLAB 2018a

I am following this tutorial on root locus methods and when writing: syms s sys = 1/(3*s^2 + 2*s - 1); rlocus(sys) I get: Error using rlocus Not enough ...
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1answer
47 views

How to find the optimal speed of a BLDC motor having hall sensors? Can we change the most efficient speed through the controller? [closed]

How do we find the speed of BLDC motor at which it has minimum electrical losses so that we design a gearing system accordingly. And can we change the most efficient speed of a BLDC motor to suit our ...
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2answers
243 views

Why does tracking different plant states result in totally different observer estimates?

I am trying to design a Luenberger observer (or a full state feedback observer) such that with one sensor available I can estimate all the states. A good tutorial is shown here. My system is 4th ...
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0answers
20 views

Steady state error due to disturbance

I was trying to solve a question from the 2004 GATE IN paper, I solved it this way, Now, the book is giving a different solution, I'm pretty sure my way is correct since they pulled the "standard ...
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1answer
58 views

Voltage to current circuit simulation problem

I want to control current through of R8 resistor adjusting VS1 voltage. VS1 increased from 0 to 5V, but AM1 and VF1 don't increase or change. Is there anybody give an idea about the mistake? After ...
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2answers
59 views

Root Locus and Imaginary Axis

I’m having some serious issues finding the point at which the root loci cross the imaginary axis for the following Open Loop Transfer Function (OLTF) ; We have been taught to substitute s = jw and ...
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2answers
86 views

Can a button control a 5 speed fan without a microcontroller?

Is it possible to control a fan with a single button that cycles though fan speeds without using a micro controller. Can anyone point me to some documentation on how this would work or any ideas how ...
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2answers
162 views

In SMPS , why does peak current mode control have lower gain for inner loop compared to average current mode control?

This has been bothering me for a while. In some of the design notes of power management ICs , it is mentioned that peak current mode control has 'lower gain - wider bandwidth' inner loop compared ...
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2answers
74 views

PID Controllable

If I have a control problem, how can I know if it's solvable by PID techniques or it needs other modern approaches? I think this basically boils down to whether the cost function I want to minimize ...
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1answer
34 views

total transfer function of a LTI System with feedback

I have calculated the transfer function of such systems many times, but now i feel like I`m going around in circles. I have drawn a few help-signals to help me solve it, but they are dependent of one ...
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2answers
66 views

Nyquist Stability Criteria

Find the stability where: Find the stability: \$ G(s)= \frac{(s+3)(s+5)}{(s-2)(s-4)}; \$ \$ H(s)= 1; \$ I run this code in matlab: ...
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1answer
64 views

Difference between Servo Motor, Stepper Motor and Switched Reluctance Motor

I posed a rather cluttered question earlier, by including the servo motor, which is, as pointed out by several of you, is not a specific kind of motor, but a closed loop control system involving servo ...
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1answer
19 views

(pyramid xpa-240)if i had 10 voltage extra to a amplifiers what will happen? [closed]

I have a pyramid xpa-240 amplifier that does work with 110/220 voltage i want to know if it ok to use on 240 voltage? Or is the voltage to much for the amplifier?
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0answers
43 views

Brushed DC Motor Speed Control

I designed different speed controllers for PMSM and BLDC motors yet, but I never tried to control the velocity of a brushed DC motor. So I gave it a try and didnt expect any difficulties, but it is ...
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2answers
67 views

Voltage control

I've been trying to design a control circuit to switch supply. What I want to achieve? I need 24V voltage for supplying an ultrasound sensor. There are two ways of gaining 24V: ...
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0answers
55 views

Designing of a PID Controller

First of all, I am new to this Q/A site. If I am doing anything wrong, please forgive me. I am having some trouble solving this problem: Given the system of Figure(1), design a PID controller so that ...
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1answer
61 views

How do integrator circuits serve as memory devices in continuous time system?

I didn't understand the yellow-marked sentence clearly, and even I did, what does it have to do with the conclusion that follows it? (marked in green). Thanks in advance.. Source: Modern control ...
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1answer
43 views

Vertical Farm Automation

I am building a system to automate a vertical farm (specifically watering, lighting, and drying) and am having trouble choosing between a wired or wireless system architecture. The farm is arranged ...
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0answers
33 views

Field Oriented Control 2-Phase Motor

I try to derive FOC for a 2-phase motor, but I'm struggling with the right formulas and I can't find any paper explaining it. The phases of the motor are 90° apart, such that I assume the Clark ...
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1answer
184 views

How to calculate poles for a high order system?

I have a fourth order system which is fully controllable and observable, which needs to satisfy certain design criteria. I am trying to design a full-state feedback controller for the following ...
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0answers
41 views

Control issues: Simulation of PMSM in FOC Model

I have been designing a model of an already existing actuator which is run in FOC with an SVPWM inverter and cascade speed-current control. Losses like eddy current or hysteresis, or switching losses ...
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0answers
18 views

Principle and generalization of proportional-resonance controller

simulate this circuit – Schematic created using CircuitLab We can introduce the model of \$u(s)\$ into the controller \$K(s)\$ to realize high accuracy control. \$u(t) = 1\$, i.e. \$u(s) = 1/...
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45 views

Transfer function_Approximation of second order system for a linear actuator

I am trying to approximate a transfer function of a system. The system is a linear actuator, connected to a feedback potentiometer. The actuator has a mass on it. The following figure is a step ...
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1answer
47 views

Finding PID parameters .. How?

As in the picture , how can I determine ki , kp , kd I tried (using provided data) by finding ζ and ωn But I end up with third order transfer function could not subsitute my results to find PID ...
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2answers
274 views

What is the relationship between a step input and an integrator?

While trying to understand control engineering from first principles I came across the following which I cannot yet explain intuitively or mathematically. What is the relationship, between a step ...
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1answer
37 views

Replacing Electrical System with a Gain?

I have a system containing both a mechanical and an electrical part, as shown in the block diagram below. I am interested in simplifying this block diagram by eliminating the electrical part and ...
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1answer
47 views

Pole placement to create a full-state feedback controller?

I am learning about control theory by going through Oagata's Modern Control Engineering. As part of a practice exercise I am trying to design a full-state feedback controller that satisfies my ...
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2answers
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What is the output of a PID controller (or any controller in general)?

I'm new to Simulink and I'm trying to get my hands a little dirty there to get used to using it. I'm working on a speed control of a switched reluctance motor. The input signal is to be fed to a ...