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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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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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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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25 views

Is it possible to temperature control a Peltier module with a buck converter that outputs an adjustable voltage?

There is something about these modules that I am not understanding. Peltier modules have performance curves that dictate the required current for specific "states" of Vin and delta T. If I have a ...
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16 views

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

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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30 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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60 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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43 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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50 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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PWM Opto-Isolator Inline Volume Control for external source to Amp (Rpi Project)

My project uses a Raspberry Pi to mute a stereo audio source (could be a CD Player, iPod etc. at line level) that is connected to an Amp. This takes place at specific times of the day. Wait a ...
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36 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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15 views

How to find a design parameter of backstepping controller for boost converter?

I have done project on control of boost converter using a backstepping controller. For that I use the PDF below: http://docsdrive.com/pdfs/medwelljournals/ijepe/2007/479-485.pdf But in paper I don't ...
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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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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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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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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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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
46 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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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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31 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
34 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
38 views

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 ...
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68 views

Control dual color LED without microcontroller

I have a latching, SPDT switch with dual color LEDs (the first page of the datasheet), that can either be Red or Blue depending on the polarity of the voltage. I would like them to be one color when ...
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Mistake in published paper about magnetic levitation?

As I was reading through this paper: Nonlinear Model & Controller Design for Magnetic Levitation System, I stumbled cross section 3.3 which I could not follow. Summarizing section 3.3 Non Linear ...
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103 views

Two potentiometers to control the range limits of a voltage source

I would like to control the range of an input voltage source using two potentiometers to establish the limits of the signal. First pot determines limit 1 and second pot determines limit 2. Lets say, ...
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If a control system T.F. has a negative gain K from routh hurwitz criterion, does root locus never cross jw-axis?

If I am considering an open-loop control system defined by: and I attempt to manually determine the root-locus, am I able to automatically assume that the system has no jw-axis crossing if the result ...
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IGBT destroyed. Help me identify any potential problems

I am trying to build an inductive oven control (for temperatures up to 1500 C), that controls the temperature by turning on the the inductive oven on and off like a commercial inductive hotplate. ...
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1answer
79 views

Reducing the order of transfer function while maintaining same response

Scenario: I have been going through Ogata Modern Control Engineering book and working through several exercises to improve my understanding of basic control principles. I came across the following ...
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1answer
56 views

What controller is this?

I'm wondering what type of controller this is? PI right? Looks like a PI to me. I from the s in the denominator. P from the K term. Usually, we've been dealing with PI controller in which the I ...
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34 views

2-Phase Motor SVPWM

I try to implement a space vector modulation for 2-phase motors and the signals looks good to me, but the motor does not really spin, it only turns for some fraction (around 60°) of 360° and then ...
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44 views

What is the meaning of the first gain in the block diagram?

I have do design a circuit based on the block diagram below. I know how to design the PID part but I don't understand what the K=2 is. For the PID I have made the following:
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31 views

Alternator speed control

We are restoring a water mill and have recently got our 2 wheels turning once more. One of them is connected to an existing 3phase 10KVa alternator. We anticipate a potential issue with the amount of ...
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56 views

Best practice for low-latency multi-motor control with single embedded computer?

I need to control 20+ motors with closed-loop control. My understanding is that I should prepare an embedded computer and connect it to several motion control cards, ex. each card handling 10 motors. ...
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1answer
386 views

Finding the Transfer Function of Spring Mass Damper System

I have been going through Ogata Modern Control Engineering book and working through several exercises to improve my understanding of basic control principles. I came across the following example which ...
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37 views

Decomposing a third order system into a first order system summed to a second order system

I have the following system: $$G(s)=\frac{2K(s+z)}{1000s^3+110s^2+(1+2K)s+2Kz}$$ Now I need to have this system meeting certain specifications (not relevant to what I'm asking now) such as a ...
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Control system for matching purpose

Is there any best practice or model to design a control system aimed at verfying an input against a predefined answer?
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21 views

Relation between bandwidth, response time and disturbance rejection for a control system

I read the following line in a control system book: Higher bandwidth corresponds to better command following, disturbance rejection and sensitivity to parametric variations. On the other hand, ...
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1answer
41 views

modeling of a dc motor with load

I designed a robot. It consists of an actuator, linkage and a camera. the actuator is considered as a dc motor in this problem. I need to identify this system. how can I find a model for actuator and ...
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1answer
81 views

How does integral term in PID lead to reduced stability margin?

Please can someone explain the following statement related to integral term. I read this in a reputed journal paper "From PID to Active Disturbance Rejection Control" by Jingqing Han: The integral ...
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Heater cooler control

I would like some sign posting to how I can produce a system. The components I have are so far, Fan control PWM based I think as I tried a variable voltage and the fan just didn't last more than 2 ...
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1answer
31 views

Holding signal true for x seconds in LabView

I'm trying to create an automatic startup override system whereby when an ESD override button is clicked, a signal will be held true for 10 seconds overriding my ESD interlocks. This seems like there ...
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How is air conditioner room unit fan motor controlled?

I have a custom project where I need to control fan speed with Raspberry Pi according to data it gets from various sensors. At first I need to know what my motor needs. For fans I use old air ...
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49 views

Low pass filter: Robustness and time constant

It is known that the transfer function of a low pass filter is given by \$ F(s) = \frac{1}{1+ \lambda s} \$. It was mentioned in a lot of places that Increasing \$\lambda\$ increases the time ...
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PID neural network temperature inertia

I am using a PID Neural Network (PIDNN) algorithm to control a multi-zoned temperature hardware. The aim of the algorithm is to minimize the error with the Backpropagation rule and weights updating. ...
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2answers
98 views

Source of poles and zeros in a physical system?

From where does the poles and zeros come into the transfer function of any system? And I am not looking for an answer in terms of mathematics but want to know what is there in any physical system that ...
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678 views

Why does this washing machine have microprocessor pins directly connected to the main AC power?

I'm studying the attached washing machine partial schematic at the point in which the main microcontroller activates 2 water elecrovalves. I would ask: It seems the microcontroller pins 36 and 40 are ...
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What communication method shouild I use [closed]

So I wan to control a bunch of devices. I though first of using RS485 but after some digging I figured out this might not work as I don't really have a pure daisy chain. The configuration I would like ...
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1answer
48 views

Understanding voltage drop in control cables

I recently worked on a project that involved a 300 feet cable run from one part of a building to another at our plant. Its a simple 120V circuit that originates in a control panel, travels 150 feet to ...
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1answer
44 views

When does a register need to get a load control-signal in order to be updated at the next clock? [closed]

I know this is a pretty basic question, but I didn't succeed to find an unambiguous answer. Does a register need to get load signal in the cycle in which the new value computation is made? or at the ...
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1answer
109 views

Supply an analog circuit with digital control

Tell me please how best to power the circuit which has an analog part and the part which, with the aid of arduino and digital potentiometers, controls the analog part. The supply voltage V(in) of the ...
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1answer
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Multiple MCP41010 Digital Potentiometers Work From One CS Signal

tell me please, for example, I control for example any parameter of the sound path of the guitar pedal with the help of MCP41010 and I need to make a dual potentiometer of two single-channel chips for ...