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

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Detrmining Hold-In current

A 120V control relay has an inrush of 400VA, and a hold-in rating of 100VA. How do I determine the hold in current, MATHAMATICALLY, WHAT'S THE FORMULA?
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2answers
49 views

Practical Implementation of Smith predictor

I am now dealing with Smith predictor and I understand that it's based on model of the controlled plant. This model I can get by some identification method, but such a model will never be absolutely ...
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1answer
47 views

Lead Compensator for double integrator

I am an autodidact in control engineering and I have been trying to design a lead compensator for double integrator system so that the closed loop poles have damping $$\zeta=0.5$$ and natural ...
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2answers
39 views

Can a PWM fan be turned on and off with the control pin voltage?

Can a PWM fan be turned on and off through the control pin? Or can it only adjust speed? Is it just a fet that turns the 12V on and off?
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48 views

FADEC jet engine gas turbine control unit MCU microcontroller [closed]

I started working on control unit for small jet engine. Many modern microcontroller can by used for this application. But I am interested which microcontroller is used for control real aircraft jet ...
0
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1answer
44 views

Dc Motor Position Control

I am driving dc motor with drv8848. I send pwm pulse to the drv8848 and then ı read encoder value. My pwm frequency is 500 Hz. So here is my problem, pulse count is same but encoder value is ...
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19 views

Led Matrix control Problem WS2812B and T4000

I have 48 x 32 led matrix (made 3 x 2, 16x16 Matrix 256 LED WS2812B-panels) I try control it with T4000 RGB LED Controller. I am using 3 ports. I have problems with multi port programs. I am using ...
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3answers
97 views

One month timer circuit

I need to cut a signal wire after one month from it start working. So I am looking for timer circuit that it work by small battery make a short circuit for my signal wire after around ( few days more ...
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1answer
41 views

how to construct an active high pass filter on breadboard

i am going to have an experiment on active high pass filters and i would like someone to tell me how could i construct / carry the experiment please i don't want be embarrassed. so tell me please ...
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1answer
37 views

digital controller design and mapping analog signal to digital integer values

I have a specific situation i am trying to wrap my head around but i think it should have a general formalism to address the problem. I have designed a BiQuad controller for a buck converter and i ...
0
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1answer
84 views

Setting up a PID controller in Simulink for an Arduino example project

On the internet I found this "Arduino PID Example Lab" as an introduction to PID-contole. I set up the hardware and it is working like it is diskribed in the document. Since it is possible to connect ...
4
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3answers
97 views

Buck Converter Control Scheme- Why isn't just a comparator not enough?

I have just begun working on a student project - full chip design of a DC-DC buck converter. I am supposed to come up with some control schemes for the converter before understanding the standard PWM ...
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1answer
37 views

Step motor intermediate position [duplicate]

Is it possible to change the position of arrow to be a little more to upper winding or right winding? If we supply different values of voltage to two winding what will happen to arrow?
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54 views

How to perform a \$\dfrac{1}{s+a}\$ type integration in MATLAB?

Currently, I am integrating an ODE of the form \$\dot x = f(x,t)\$ in MATLAB using the function ode45 This is equivalent (in block diagram form) as passing \$\dot x\$ through an integrator ...
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3answers
62 views

Finding Open/closed loop transfer function

I plan to determine the open/close loop transfer function of the attached motor. I have been able to combine K(s) to 1/s in series but am not too sure of how to add up 12/pi outside the summing ...
2
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4answers
416 views

Controlling AC light bulb intensity

I saw in some movies that indoor light intensity is controlled with human presence and distance from the sensor (the lower the distance, the higher is the light intensity). I am very interested to ...
0
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0answers
47 views

Controlling external power supply voltage with analog signal from Teensy

I am trying to control the strength of an electromagnet using the analog output of a Teensy 3.2. It is a true analog output, not PWM. The electromagnet runs off of a 12V power supply, and the Teensy ...
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1answer
37 views

Design a P-Controller given the root locus ?

I used to have the transfer function given but here the root locus instead ... Can one help with the start...
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2answers
99 views

How to find the time delay of second order system from process transient

I am seeking for simple Identification method for the second-order systems plus time delay. The system is QNET vertical take-off and landing (VTOL) trainer. Using the tutorial I found the system ...
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2answers
103 views

How to connect a relay to 220 Volts outlet?

I used relays before but just for simple 5V DC signals control using a Raspberry Pi. Now I'm quite cautious and would like to ask for some help from professionals because I'm not planning to set my ...
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1answer
58 views

problem : find the coefficients of linear system used to build a digital oscillator ..?

Please can one explain to me I having difficulty on how to start Thank you all *** can anyone correct me if anything is wrong !
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1answer
44 views

Controls: Getting the feedback transfer function of a Plant and Controller

I'm designing a function in Python similar to MATLAB's 'feedback(T)' command. I know modules already exist, but it's something I want to do for myself for fun. However, I am running into issues. Let's ...
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0answers
27 views

How to determine the stability from Nyquist plot for Minimum and Non-Minimum Phase system?

For a non-minimum phase system there are some zeros that are in the RHP of S_plane and since the Nyquist plot Does't encircle the origin there Must #of pole in the RHP that equal to # of zeros In ...
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1answer
64 views

What is the concept behind speed change in a constantly loaded DC series motor?

I have a problem regarding DC motors that I am trying to solve. I think that I might not understand the assumptions that are given. The question given is: A DC series motor is connected to a load. ...
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2answers
64 views

Control door with RS232 or Ethernet relay

Our company use a fail safe electric bolt with a remote control for the entry door. It closes when the power is ON and vice versa. It does work normally but I want to make a hot button for the ...
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1answer
40 views

Determine unhampered natural frequency and motor constants from graph?

I can find zeta from the PO given in the graph but I don't know any rule relate wn with tp and I don't have value of the of ts and tr For part b and c I don't know where to start please help me ...
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274 views

Real device with derivative transfer function

Is there a device that has 's' as its transfer function? I.e. a physical system implementing a derivative?
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58 views

Capacitor conduct enougth current to maintain coil

Im using an arduino to control two 220V AC motor and One 220V AC contactor, here is the diagram; I have the same components on each snubber; a 0.1uF polyester 250V capacitor and a 100Ohm 5W ...
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0answers
42 views

Gate operator - how to tell if gate is open or shut?

I have just installed a LiftMaster model LA100 electric gate operator. I want to interface this gate with my existing phone and household control system, for the purpose of 1) operating the gate ...
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0answers
82 views

Why is my snubber conducting?

I am doing some refrigeration control with arduino and lcd... and I use snubbers to keep the relays from erasing the LCD from the control... The last time I use the relay of the strip board each with ...
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1answer
50 views

Quick question about a closed loop control system

Using above loop, we see that \$ \dfrac{y(s)}{r(s)} = \dfrac{p(s)c(s)}{1+p(s)c(s)} \$ and \$ \dfrac{e(s)}{r(s)} = \dfrac{1}{1+p(s)c(s)} \$ (well known results) Why is that: If the close loop ...
5
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4answers
208 views

Full bridge HVDC to modfied square sine - random half side MOSFET burn

I am trying to make a step-down 350V to 220V voltage converter. I decided to go with rather simple circuit of full bridge MOSFET inverter since my loads are only resistive or switched. I had built it ...
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1answer
67 views

Overshoot more than 100%

I am modeling a line sensor car, I like to find out the transfer function of the car under an unit step input for a steady speed so that the system dynamics stay the same for the constant speed. ...
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1answer
60 views

Using Arduino for 3d heating bed

I would like to use an arduino system to control a heating pad that I will be using in my system. ...
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1answer
143 views

How to calculate poles of overdamped, 2nd order system if only given experimental data?

I have been looking about how to calculate poles if I have experimental result of a step response in Matlab that looks like an overdamped system. So far I only found information (through internet or ...
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1answer
85 views

How do “Inverter” or “IGBT” welders control CC and CV output?

I have a question on welding units. A lot of the newer units these days have "Dependable Fairchild or Infineon IGBT (non module)", "MOSFET design for Hobby use" and I can't tell if all of this stuff ...
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126 views

Building a PWM circuit to control a 90v DC motor at 20amps. Will this work?

Sharing the load among 4 transistors with ballast resistors -
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1answer
82 views

PI control Implementation for Buck Converter using Arduino

I am implementing current control on my synchronous buck converter using ARDUINO UNO. I designed my control via "Symmetrical Optimum" method and calculated the values for Kp and Ki (not Kd since i am ...
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3answers
370 views

How to tune a PID controller to a nonlinear process

I have a nonlinear thermal process (nonlinear radiation becomes more and more present as temperature goes up) that I would like to tune a PID controller to. I'd like to control the temperature as ...
2
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2answers
64 views

Interface for Induction Motor

I'm trying to make a board for controlling a reversible single phase induction motor. The board simply needs to be able to turn on/off the motor and control the direction. My understanding is that ...
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2answers
68 views

how to control a coil

I have been working on a project controlling a coil to attract a metal ball at high speed. I measure the speed of the ball in front of the coil and then decide how fast I want the ball to accelerate ...
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2answers
68 views

What supplies ATS control circuit when the mains fail?

In a church, I've seen a large generator and ATS panel (automatic transfer switch) so that the generator turns on when there is a failure in the mains. If there is no power in the mains, How does the ...
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0answers
40 views

Modified Z-transform of digital parabolic sequence

Good afternoon, can somebody tell me where I do a mistake in derivation of modified (or advanced) Z-transform of digital parabolic sequence i. e $$f(k) = (k\cdot T)^2,$$ where \$T\$ is sampling ...
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1answer
109 views

Using potentiometer to measure distance in linear actuator

I need to use a linear actuator for a project. From what I understand, the position feedback comes from a potentiometer. Here is an example: One more example: ...
2
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2answers
96 views

Why is this second order system difficult to control?

Why is system of the type $$T = 1/(s^2 - 1)$$ Difficult to control using standard control methods? When I look at frequency plots, it doesn't seem to give me any important information as to why ...
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2answers
111 views

How to trigger triac using DC?

This video features a circuit that triggers a triac using a DC: https://www.youtube.com/watch?v=ZXXup79B6Gc I would like to make a little modification on it it. The video says that I have to connect ...
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1answer
60 views

Li-Ion Battery Charging using current controller

For a single Li-Ion battery cell charging process, one needs to do a CCCV cycle, in which first the li ion cell is charged using a constant current (of rating 1C normally), and when a specified ...
5
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2answers
99 views

Control theory: is there any actual application for D in ABCD matrix?

Recall that a LTI state space of a dynamical system is given as: Is there any actual purpose for D in the output equation? If D was not zero, it would mean that the output is "directly" ...
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1answer
66 views

A question about very simple light Dimmer circuit?

I've learned that a Triac works as a switch for controlling AC current. Why not connecting the load (L1) and Triac in series? at the position of red arrow? My reason is that a small amount of current ...
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1answer
87 views

Cutting power to IC using MOSFET fails

The aim of the circuit is to enable/disable power to an IC (U2) using a transistor (Q1) to enable/disable ground, controlled by ...