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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1answer
71 views

How can I use 24V DC input for Arduino digital pins?

In this circuit, switches should be connected to 24V DC and arduino pins should check whether switches are on or off to control led behaviour. I don't know how to use 24VDC for this situation. I would ...
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2answers
543 views

Is there an English word for the output response of a non-minimum phase system?

I've noticed in some French language control courses they have a word for the initial part of the response of a non-minimum phase system. They say it has "un départ malin". I looked up ...
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1answer
39 views

Power System Design for BLDC control - why not use a DC/DC convertor?

So I have experienced the usage of a BLDC motor to spin a propeller. The electrical design ensured the bus voltage was such as to bring the motor to a good operating regime given the Kv, etc. However, ...
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2answers
48 views

How to control braking circuit of the three phase voltage source inverter?

I have been developing a control software for the three phase voltage source inverter for three phase induction motor control. There is a requirement to implement regenerative braking algorithm where ...
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2answers
39 views

How can a BLDC motor respond to a specific dynamic load demand without changing the supply voltage? [duplicate]

Coming at BLDC motors from the theory side, my understanding has always been that they have a linear curve based on Kv, no-load current, and resistance, for a given applied voltage. Now the thing is, ...
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13 views

How to determine transform angle in field oriented control of three phase induction motor

I have been developing a control software for the field oriented control of the three phase induction motor. I have studied a lot of application notes and literature about this topic. Based on that I ...
2
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1answer
79 views

How does a washing machine intake solenoid valve control flow rate? [closed]

Our washing machine has a pair of solenoid valves on its water intake looking like this: (One controls the flow to a tube running to a detergent compartment, the other to a conditioner compartment.) ...
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1answer
75 views

What to use for logic control circuit without Programming?

I need to design a digital combinational logic circuit for control a small scale industrial product which normally uses mechanical relays. There are only few LEDs as indicator and few digital output ...
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3answers
107 views

How to do the bode plot for this function without Matlab?

I want to plot the bode diagram without any software for $$G(s)=\frac{(s-2)}{(s^2+4s+15)(s+2)}$$ I do not know how to deal with the factor of \$s-2\$ I will be appreciate if someone can show me your ...
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0answers
42 views

How does product of two terms represented in control system block diagram?

How does the product of two terms represented in the control system block diagram? Let's say I want the output as a product of two states. i.e. y = x1*x2 how would I represent it in a block diagram?
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Is the viscous friction coefficient of a BLDC motor dependent on the system inertia? [migrated]

I have to model the required torque to move a system composed of several mechanical parts such that this system performs a motion profile. It is a Maxon drive composed of an ECX Speed 16L BLDC micro-...
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3answers
66 views

How to control LCD monitor with micro controller?

I would like to control my PC monitor. After disassembly I found the control buttons are implemented like this (just more data line and buttons) I would like to control it (with ESP2866) With the ...
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2answers
64 views

Controlling low DC voltage with high AC voltage

I replaced my existing manual roller blind switches with Wi-Fi-enabled touch ones and I'm facing an issue with properly fitting them in my setup. The manual roller blind switches operated on 16 VDC ...
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0answers
35 views

Does a circuit graph say anything about controllability of its currents?

Graph of an exemplary circuit can be found below. Based on this graph, can anything be said about controllability of the edge currents ED, AN, BN and CN if the edges DA, DB, DC, AE, BE and CE ...
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2answers
58 views

How can a system reach its steady-state if the I-action of a PID controller, u(t), doesn't go to zero as the system approaches its desired value?

The I-action of a PID controller, which integrates the error over time, results in the control signal: $$u(t) = \int_0^{t}e(T)\text{d}T$$ This means that, when the system reaches its desired value ...
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1answer
40 views

Automation Control Cabinet Isolation

I`m designing a control cabinet with a 60A output demand for heaters. The on/off switching of the heater will be done through a 24V/80A contactor(relay). The customer wants the main switch on the door....
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1answer
66 views

Control Board with simple logic

We are using an old electrical system in industry. My task is to digitalise it. As i saw, PLC is too expensive and large scale for our operation. Also, microcontroller needs programming which makes ...
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0answers
13 views

esp8266-01 problem

Hy, Can you help me with a problem. I build on breadbord circuit from atached scheme. If connect power supply the relay activate wichout send commend to esp8266. If dissconnect power supply and remove ...
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3answers
69 views

Is ther a standard circuit/component to control the temperature 500W resistive heating element from a PCB?

I have a 500W (230V) cartridge heater element and a K-type thermocouple. I want to use the feedback from the thermocouple to be able to vary the temperature of the cartridge heater. I have no concerns ...
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0answers
40 views

Slope Compensation - about the slope value

I read an article on EDN about slope compensation written by Sergio Franco. Here it is : https://www.edn.com/slope-compensation-in-pcmc-dc-dc-converters/ It takes the case of a buck converter. It ...
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0answers
57 views

Problem understanding transfer functions of second order filters

The transfer function of any second order filter can be found by analyzing the circuit using the Laplace transform. For example the transfer function of a second order low pass passive RLC filter ...
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0answers
55 views

How to make a PLL output the phase modulo 360°?

I have made a PLL to obtain the mechanical angle encoded in quadrature sine signals (the envelope of a resolver output) ; it implements: error=in-out is approximatively equal to sin(in-out)=sin(in)cos(...
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1answer
55 views

Control Systems - Pole Location

Hello there I am trying to solve a question and in the question I have a system with two complex conjugate poles. The question asks me to analyse the Maximum % Overshoot, Settling-Peak-Rise Time and ...
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0answers
15 views

Solenoid Actuator (Linear) Force Calculation

what is the simplest form of law to calculate Solenoid electromagnetic force. i.e. a relation between force and electric current knowing that i'm given a Force constant with measuring unit N/A^2 (...
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1answer
51 views

What is the gain margin of the system, when the phase crossover frequency does not exist?

I have a simple questions I have a system in which the system will never reach -180 degrees for any frequency. Does that make the gain margin infinite ? If yes, does that mean that the system will ...
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1answer
27 views

How to control a capacitance control panel from a Raspberry Pi

I have a touch control panel with only one lead going to each "button" on the glass, it is not a full circuit only half of one. I have concluded if i ground one of the pins (ex: power), it senses and ...
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1answer
27 views

How can I get the viscous coefficient of friction B for a DC motor?

How can I get the value of B for a DC motor when the data sheet has Viscous Damping (F1) like the following?
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0answers
61 views

Desing a PI controller for process with complex conjugate poles

I have a dual-loop control system. In the inner loop, the process is represented by a first-order transfer function. For control I use PI controller. Open loop transfer function is: $$ G_\text{co}(s) =...
-1
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2answers
84 views

Phase margin vs. damping ratio (non-unity feedback)

So there is a well known condition which relates the phase margin with the damping ratio for a unity feedback system: $$\Phi_m = \tan^{-1} \frac{2 \zeta}{\sqrt{-2 \zeta^2 + \sqrt{1+4\zeta^4}}}$$ ...
2
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0answers
87 views

Is my IIR implementation (in C) correct for this difference equation?

I recently started developing a digital regulator for a DCM boost (Digital regulator for DCM Boost - How does it relate to duty cycle?) And I've implemented the difference the following controller in ...
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1answer
45 views

Digital regulator for DCM Boost - How does it relate to duty cycle?

I really hope someone can help me here, I'm tearing my hair out trying to bridge the gap between control theory and electronics. My aim is to control a discontinuous conduction mode boost converter ...
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0answers
22 views

How do I achieve speed reduction in a DC series motor by adding resistance? (calculation)

So i'm hoping someone can look over my answer as i'm sceptical it's right. I used a shunt calculation for this series question as I've honestly no clue how else to do it; Calculate the size of an ...
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1answer
32 views

Using a single push button to start/stop a motor

Is it possible to use a single push button with a N/O and N/C contact on the back to start and then stop the same motor using only relays. The button will be pressed and the motor runs until the ...
0
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1answer
42 views

High power heating element control

How to control high power (~5kW) heating element using MCU? I need a very simple application that shuts down the element, when it reaches set temperature. Maybe I can do it using SCR? F.e. Т161-160 (...
2
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2answers
45 views

Dynamic control of DC-DC converter current limit

I am interested in having dynamic control of the output current limit circuit of a DC-DC converter controller (the LTC3777 buck-boost controller in my case). This IC has a built-in current limit using ...
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1answer
53 views

How to find the phase of this transfer function?

I have been trying to find the phase of this transfer function: G(jω)H(jω)=0.1695/jω(5.88jω+1) by doing this: Phase = -arctan(0/0.1695)-arctan(w/-5.88*w^2) PHASE = 0-arctan(1/-5.88*w) Is this ...
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0answers
13 views

Crydom SSR Crosstalk

Components used: Crydom SSR used PMP2425W Control Voltage 4-20ma (IO Vard) Supply voltage 230VAC (Single phase) Operation - Heater Issue: I am getting cross talk between 4 SSR's when line voltage ...
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3answers
49 views

Effects of PWM the source voltage for DC & BLDC motor?

In DC or BLDC motor control.. The standard is to PWM the H-Bridge switches to control the motor current .. Why not to PWM the source voltage (V-Motor) and just switch the H-Bridge switches (in lower ...
2
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2answers
38 views

Can badly tuned Feedforward still decrease following error

Let's say we're trying to control the speed of a motor to 20 revs/sec, and we know that our controller output for that speed is approximately 5. We currently have a Proportional controller to drive ...
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2answers
48 views

Multi-relay interlock circuit/control

I have eight different kV motors that I need to run from the same source. I cannot change the topology to have different sources for each motor. Ideally something that simply turns the relays on one ...
0
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1answer
43 views

Current Feedback from PWM controlled Motor

I am looking at two different ways of controlling motor speed and torque of a simple small DC motor. The circuit on the right is the analogue circuit with the current provided by the power bjt. Here, ...
2
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2answers
51 views

Help with a Closed loop and zero order hold function ZoH * 1/s(s+a) type

i would appreciate some help in solving this problem, i need to find the transient response for a unit step, i have a brief idea of how to solve, but my graphs in matlab doesnt seem to fit with the ...
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1answer
43 views

Induction motor field oriented control software timing

I have studied several application notes and technical literature regarding field oriented control of three phase induction motors. Based on that I have encountered that there are two main approaches ...
0
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3answers
87 views

Stability of a two poles negative feedback amplifier

let's consider this analysis of a two-pole amplifier with negative feedback (Microelectronic Circuits by Sedra Smith 7th edition): Before showing you my doubts, let's consider this introduction made ...
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1answer
39 views

How can this problem be solved with partial fractions? (Zero order holder with g(s) block function)

im trying to figure out how to solve this problems for values a=2; actually im stuck, professor told me how to work it, but i cant figure out what to do exactly, we are using partial fractions inverse ...
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1answer
93 views

What is the difference between a 1st and 2nd Order Digital Filter

I was just curious as to the differences between the two order filters? How I created these discrete filters for references Designed in Continuous first then converted into Discrete Using Tustin's ...
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0answers
25 views

Accentuated output current ripple in parallel dc-dc converters

I'm building a simulation model in SIMULINK consisting of three parallel bidirectional buck-boost converters feeding a resistive load. Each converter is equipped with cascade voltage and current ...
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2answers
29 views

Solid state relay is not completely open when control inputs are not connected

I am trying to control a 12W light using this solid state relay. Even when I haven't connected my control inputs through an Arduino the output light glows(very dim). I have an input voltage of 230V. ...
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0answers
12 views

Real Electrical Grid Operation with OPF

So I spent some time reading Power System Analysis & Design by Duncan Glover, Overbye and Sarma and I have a question concerning real power systems operation. If we run optimal power flow once ...
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4answers
1k views

PID controller slowly oscillates out of control

I am trying to tune PID controllers for my drone. There are 3 controllers, one each for Pitch, Yaw and Roll. I have gotten Yaw tuned to a reasonable amount and I am assuming the values for Kp, Ki and ...

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