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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How can a power converter small signal model predict transient behaviour during a load step which is a large signal disturbance?

I see small signal model being used to predict the Overshoot/Undershoot of output voltage due to a load step. How do we justify this approach, since the basic assumption of small signal modelling is ...
Divya K.S's user avatar
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Why the steppermotor does not close 100% in power fail mode [closed]

I am having a problem with a stepmotor which opens and closes a valve. The motor works fine when the powersource is on. We have also powerfail option, when we dont have energy from the powersource, we ...
Albion Qovanaj's user avatar
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Reference Voltage Tracking for DC-DC boost converter

I have a boost converter which works perfectly with an s-domain controller (using a type-3 compensator and dual loop). Now, I need to do this using digital control (z-domain). I have converted the s-...
Boost_Guy's user avatar
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Design a PID controller for a MG=1.5

Consider the following system: I need to design a PID controller with a gain margin of 1.5 for the disturbance P(s). In order to have a certain gain margin I need to find the critical gain Ku, so ...
BadEnglishSorry's user avatar
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Dual 4-20 mA inputs to voltage ramp

I'm trying to take dual 4-20 mA signals and use them as a heat/cool signal for a Peltier module. I have an integrator but I'm trying to find the best way to decipher the dual signals and turn them ...
Kieran Clifford's user avatar
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PCB layout/schematics of solenoid lock control - Problem - uncontrollable unlocking

I have a problem with opening solenoid locks. Sometimes, immediately upon connecting the power, and other times after about half an hour or even an hour, the locks start to open uncontrollably. I have ...
douce's user avatar
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How do I find my phase margin using the Bode plot?

From the Bode plot, is my phase margin correct? I estimate around +30 degree phase margin - or is it -30 degree phase margin? I am unsure about this thing.
Ashytone's user avatar
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Can a MOC3032M optocoupler be used to generate a DC PWM signal?

I'm trying to make a circuit that can output an 80 Hz PWM signal. I'm planning to use an Arduino to switch an optocoupler that will control the duty cycle. Here is my circuit: After building the ...
jjk's user avatar
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1 answer
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Reflow oven control technique

I am developing a DIY reflow oven using a 10L common electric oven with quartz heating elements. Below is a graph that represents the oven's step response (open loop response): In blue: oven's step ...
Emanuel M's user avatar
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Zener diode as a switch

I would like to use a Zener and a NPN transistor as a voltage switch to close a 12 VDC relay. My thought was 12 V zener to the base to turn on the transistor and close the relay when supply is above ...
Daniel Hart's user avatar
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Is it wise to determine heating element temperature from resistivity?

Context I'm making an electric furnace for melting metal, and aiming to make my own controller. Everyone seems to just use thermocouples and a control loop, I thought perhaps I could just measure the ...
TrisT's user avatar
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Can anyone point me in the right direction to solve this control systems problem?

The problem is the one at the top of the page. I was able to reduce the first block diagram into the feedback loop block and I got H(s) = 4s + 1 using the identities in the book. I've spent hours ...
Pwestm's user avatar
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Allowable process variation for non minimum phase plant

Scenario (plant model subject to process variations) Consider a plant \$P(s)\$ in series with a controller \$D(s)\$ with a negative feedback path around it, where the closed loop is given by the ...
Mr Phase Locked Loop's user avatar
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4 answers
89 views

Connecting every other DIN terminal to each other

I am building a custom panel. My output DIN terminals are supposed to be in this order: Power, Ground, Power, Ground, Power, Ground.... I cannot find a proper way (jumpers or bars) to connect them. ...
aeroengineer's user avatar
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Control engineering: how to design a system for desired impulse response

I've designed a system to get a desirable step response. However, I think the impulse response of my system is more important. There are many methods for designing a system for transient response ...
Mr Phase Locked Loop's user avatar
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MOSFET and Falstad

I have a circuit to control a small motor which is modelled in Falstad. See model below. when I start the simulation the voltage on the MOSFET side of the motor is low and then climbs until it reaches ...
bct's user avatar
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Relation between controllers and compensators?

https://www.control.utoronto.ca/people/profs/kwong/ece311/2018/lecture_notes/lead_or_lag.pdf Please check the above link especially the lines shown highlighted in attached snapshot. So can we say that ...
DSP_CS's user avatar
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How does a voltage controller (outer loop) set the current reference for the (inner) current loop in cascaded control of a boost-converter?

I am currently trying to understand the cascaded current-voltage control of a boost converter (and later design the PI-controller). Let me summarize the information I have collected so far: Outer (...
Sebastian90's user avatar
1 vote
1 answer
81 views

How can I implement current control for proportional valves?

I am currently working on operating a proportional valve for airflow, but I am facing some challenges. Initially, I attempted to control it using a DRV8871 motor driver with PWM frequencies of 500 Hz, ...
Nav's user avatar
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2 answers
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How to reduce gain margin to finite value?

I am trying to observe bode plots for a system but i am getting infite gain margin. I know that positive phase margin and/or positive gain margin represent stable system while negative phase margin ...
DSP_CS's user avatar
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3 votes
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I don't understand this temperature controller circuit's behaviour [duplicate]

I am trying to build a circuit to regulate temperature for a few microheaters. Here's the circuit I am using: This is a constant temperature controller circuit often found in the research papers and ...
TK23's user avatar
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How to vary output current by maintaining constant output voltage? [closed]

I want to control a proportional valve by keeping its voltage constant while varying its output current. Is there any way to achieve this
Nav's user avatar
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Can an RCL circuit be asymptotically unstable? If so, what does that mean physically?

I'm analyzing the asymptotic stability of the system of ODEs that comes from an RCL circuit in series. Below is my circuit, with battery voltage \$u(t)\$, resistor with constant \$R>0\$, capacitor ...
travelingbones's user avatar
1 vote
2 answers
94 views

Why doesn't the LED shut off?

Why doesn't the LED doesn't shut off when I set the input to 0V? The simulation does, but that's not what happens in the real circuit. I've grounded the second op amp's inputs (on a NE5532), tried ...
PiedPiper's user avatar
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BLDC motor position control

For my project, I need to control position and speed of a BLDC motor with PID. Although there is information about the speed control of the motor, I could not find much information about the position ...
fefef's user avatar
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Rexroth Indramat CLM 1.3, how to execute command

I have to execute the command: CLA Clear Axis (Absolute Encoder Value) E 0170 CLA 2 To be honest I don't know how the CLM works ...
user1923363's user avatar
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For the equation below, how would I calculate the gain required for a settling time of 1 s?

The equation is: \$G=\dfrac{k(s+4)}{(s+1)(s^2+6s+13)}\$ How would I calculate the gain (k) required for a settling time of 1 s? By using \$ts=\dfrac{4}{(ωζk)}\$ the closest value I got was ...
Colonel Floppsie's user avatar
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1 answer
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Understanding Signals, LTIs and Electrical Circuits [closed]

I am an Electrical Engineering student; and recently read through subjects like "Signals and System" and "Control Theory". The flow on concepts amidst these two subjects was ...
Kartik Pandey's user avatar
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1 answer
43 views

Control manipulator mechanical arm by infrared

I want to make an infrared control circuit (remote) connected to the Manipulator Mechanical Arm. I found this circuit, but the outlet is 230 volts, and I do not think that the arm will handle this ...
Mohammed Al-Elaiwi's user avatar
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2 answers
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Step response v/s DC voltage

I have to find step response for this circuit considering my input as Vo and step for Vin( I am using Simulink for this) Firstly what i did was making this circuit (DC voltage is 1V) The response on ...
gagan chopra's user avatar
1 vote
1 answer
67 views

How does deceleration work on a servo drive?

I'm confused by the fact that PLCopen MC-blocks used to control servo drives from a PLC have separate acceleration and deceleration parameter. For instance, MC_MoveAbsolute. I don't understand what ...
relatively_random's user avatar
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0 answers
59 views

ESP32 Stepper Motor Control PCB Design Validation

I am presently in the process of developing a PCB designed to act as a foundational board for the precise control of a stepper motor. The system incorporates an LCD display and various sensors for ...
Kabl62's user avatar
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0 answers
58 views

Traction characteristic of the three phase induction motor

I have found a datasheet for a three phase induction motor intended for the traction applications. Among other information there was a below given traction characteristic . Unfortunately I am not able ...
Steve's user avatar
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Programmable Controller for Sensorless BLDC Motor

I'm trying to find a programmable controller (or system for controlling) a sensorless BLDC motor - 24V, 20A. I want to control speed, fwd/rev, and dwell time in certain positions. Apologies if this ...
HD15's user avatar
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0 votes
2 answers
62 views

How I can use light to control of amplifier?

I want to make a car that I can control by light, and I thought of using a photoresistor and a light sensor to control the amplifier to make it perform two functions. The first function is to make the ...
Mohammed Al-Elaiwi's user avatar
0 votes
2 answers
49 views

Confusion regarding formula of positive feedback

Please check the attached snap especially the yellow highlighted "plus" sign . According to my understanding it should be "negative" because it is case of positve feedback as shown ...
DSP_CS's user avatar
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0 votes
2 answers
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Implementing feedforward control in heated box

I'm making a temperature-controlled box. Issue I'm having is that it overshoots and undershoots a lot because it takes a long time between turning the heater on/off and seeing a difference in ...
Popeye's user avatar
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1 answer
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Does "Torque control" using FOC consider input (battery) voltage drop?

All information related to Torque Control using FOC technique consider a current control, so they suppose a correlation between req_Id (Id desired) and requested mechanical torque. PI regulators ...
Álvaro César Satué Crespo's user avatar
-1 votes
4 answers
168 views

What is wrong with this circuit?

This is a circuit of a vehicle ECU. It should turn on the ECU but there are some mistakes and the ECU won't turn on but I can't figure it out:
Reza R's user avatar
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1 answer
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Spice Software Supports Parameterizing Sub Circuits?

I have Multisim and I can't figure out how to add value fields to my sub circuits or hierarchical blocks. Let's say I'm making a sub circuit that is simply a voltage divider... so I have two resistors ...
Amr Elkamash's user avatar
2 votes
0 answers
85 views

Damping gets better, but overshoot increases. How can I explain it?

I have three transfer functions as below The pole-zero plot and the step response of the transfer functions are given as It makes sense to me that G3 has a better damping than G2 and G2 has a better ...
Ali Hosseini's user avatar
4 votes
2 answers
1k views

Why 2 thermostats of different rating in series in heater circuit?

I am trying to repair a small water distiller. The machine is fairly simple, heater boils water, the vapor is cooled by a fan and the water is collected. More information: How to use Connect power ...
Eng Sam's user avatar
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0 answers
56 views

Buck Converter Output Voltage Swing problem

I am designing a voltage mode control buck converter and I have an issue with my output voltage swing. I made calculations for type 2 compansator. I can't figure the cause of problem is stability of ...
MSB's user avatar
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2 answers
79 views

How do I best protect a PLC and power supplies from voltage and current spikes coming from actuated components?

Problem My PLC is getting voltage spikes in the onboard ADC readings when I turn on actuated components elsewhere in my electrical system. I need to protect my PLC from these spikes because they ...
Jman's user avatar
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2 votes
0 answers
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How can I explain contradictory damping performance between linear and nonlinear systems?

I have a 3rd order nonlinear dynamical system, representing a power system. After linearizing the system, it turns out that by increasing the parameter L_g, damping is reduced and thus the overshoot ...
Ali Hosseini's user avatar
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0 answers
26 views

Understanding the effect of HPF on the amplitude and phase control in STM32

I am using a STM32 to control amplitude and phase of a signal when passed through a RC circuit(LPF) which later will be replaced with a tip tilt mirror. I have a STM32 which has the code implemented. (...
Rima's user avatar
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Nyquist Plot Stability with Angle

I don't understand the solution done here. The Nyquist criteria I know is Z=N+P and I don't see the relation with this solution. Where do the angles come from?
Yimmir's user avatar
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1 vote
2 answers
83 views

Peltier linearity and equalizing control of heating and cooling directions

I need to change between heating and cooling with a Peltier, controlling this with PID. I've read a ton of information on Peltiers, looked at their datasheets and despite of this, I still cannot ...
irilinir's user avatar
0 votes
2 answers
453 views

PID control of a reversible Peltier (using Arduino PID_V2 library)

I have a box of water, which temperature I have to regulate to a ramping setpoint which could go both below and above the ambient temperature. So I have decided to use a Peltier for both cooling and ...
irilinir's user avatar
0 votes
1 answer
172 views

The center and radius of root locus

With this opened-loop transfer function, $$ \begin{align*} L(s) & = \dfrac{K(s+2)}{s(s+1)} \end{align*} $$ I would like to plot the root locus of this system. Based on the textbook,...
Sonamu's user avatar
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