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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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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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0answers
16 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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2answers
691 views

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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0answers
15 views

Looking for a multi-channel RC relay module [closed]

My current situation is this: I am building some type of a wireless system that automates industrial stack lights based on the state of an SQL database. As of right now I am using an Arduino with a VB....
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46 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
91 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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2answers
665 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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2answers
72 views

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
47 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
29 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
105 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
26 views

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 ...
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1answer
33 views

BLDC Transfer Function Inductance Value

I realize a very similar question has been asked here, but I'm slightly confused about the derivation, specifically the quantities Lq and Rq which refer to the armature inductance and resistance. I'm ...
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1answer
38 views

Automatic control - linearization with two states

I don't understand a part of the solution to c) of this problem, namely linearization at a stationary point using Taylor series and partial derivatives. I am used to linearization of \$ f(x,u) \$ (...
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2answers
62 views

Linearization of motor's thrust

I'm working with a water vehicle that use four motors to move. They are placed at the corner and are fixed. Hence the movements are obtained changing the speed of each one. The vehicle can move along ...
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1answer
72 views

Solid-state relay to control 120v with 2v

I need a solid state relay to control 120v AC with about 2v DC. What I'm trying to do is control a light string with the relay. I just need something simple, where I can stick wires in and out. What ...
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1answer
56 views

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
82 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
84 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
80 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
62 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
158 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
73 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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0answers
55 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
56 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
124 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
121 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
74 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
145 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
25 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
44 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
104 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
243 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
93 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
89 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
46 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
67 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
246 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
55 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
49 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
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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
105 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
63 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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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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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 ...