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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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Voltage source & current input

I am working on a project where I have a current source (analog output from a PLC) controlling a VFD. Based on the position of the dipswitch, the VFD will accept either a current or voltage input. The ...
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Obtaining Plant Input data from System Identification (PID)

I'm trying to obtain a mathematical model from a physical plant using MATLAB. Using the system identification tool you need the plant input and output data. I'm struggling to match the theory to my ...
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USB internal control to on/off a pc fan molex circuit

I am new to electronic circuits so I might not have the correct nomenclature for some items. Description: I have 3 high power 12V PC fans (NON PWM) connected to a hub that draw power from MOLEX ...
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how to control state space when it is not controllable?

I have the matrix A and B and I computed the controllability matrix and found the rank is lower than n. I know I can't apply pole-placement , how else can I solve the system? n is the order of A
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27 views

4 Wire Thermostat for Two Separate Heaters

Is there any reason why I cannot use a 4 wire thermostat (Honeywell T410B, DPST) to control two separate heaters (they are fairly close to each other)? The contacts are each(?) rated for 22 A and let'...
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29 views

LowPro proportional valve drive circuit clarification

Am new with amplifiers when trying to use them as a current controller so is just after some help in understanding the circuit. I am designing a circuit that will use a LowPro Proportional Valve ...
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66 views

What is the importance of Lyapunov stability for non linear control?

I understand that studying stability gives a particular region from which if we start it will converge to an equilibrium point. But why is the study important specifically for designing non linear ...
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Transfer Function [ the transfer function of the feedback stage? (Optical sensor and the lm2917) ]

I have to make a control system that maintains a constant speed of a small car prototype using a DC Gearmotor regardless of external disturbances such as slopes (small slopes). For the development of ...
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77 views

Convert from a specific voltage range to another

I need to convert the external control voltages of +4/-4V range to 0/5V in order to replace now obsolete SSM2050 with micro controller based solution inside an old vintage synth. Is there any easy and ...
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46 views

ZCD with PIC 18LF45K40

I want to implement phase angle control for a single phase ac fan. To achieve that we need a ZCD circuit interfaced with a microcontroller to get a pulse at zero crossing. As our circuit has some ...
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2answers
68 views

Using an analogue multiplexer to control a motor controller?

I am designing a control circuit for a Sabertooth 2x60 motor controller. When this controller is in analog mode, it runs in full reverse (0v control signal) until my software starts and applies 2.5v ...
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1answer
52 views

PWM Controller for known f(t)

Suppose I have some signal input which I know. The signal is 85 seconds long and its not something I can describe with equation but It looks as follows: Now, I have made a simple PWN controller that ...
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39 views

Design PI a controller for a “kind of” non-linear system

I have to design a controller for a plant ("Base"). My problem is related to the input term B*T0: in this case I have one output and two input. I think that I can split the "Base" model in two parts "...
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Sluggish step response of control loop

I have a question regarding the PI controller. Lets say I have an actuator via which I control some plant. The control signal at the output of the PI controller is at its maximal realizable value. So ...
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66 views

Looking for a quote on dynamic system identification

Does anyone know of a quote by an eminent control theorist or controls engineer or book author who I could reference who said something along the lines of the following: The process of control ...
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55 views

What is the difference between 'x' and 'plus' symbol in the block diagram

Generally speaking, what is the difference between the 'x' and the 'plus' symbol in a closed loop block diagram? For example, in (https://ieeexplore.ieee.org/document/6983570) , what's the ...
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82 views

Analog implementation of imaginary roots in a transfer function

I have a simple boost converter, and from multiple papers I've read through, a Type 3 Compensator is recommended. I designed one in Matlab/Simulink, and it reacts very quickly. The problem is, when I ...
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27 views

Adjust LQR weights to improve battery runtime in two-wheeled-inverted pendulum

I'm currently doing a controls project involving a self-balancing robot(or two wheeled inverted pendulum). I have been able to stabilize the system with the use of PID and optimal state feedback. ...
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CANopen SYNC object and synchronous window length

In CANopen specification there is an object called Communication Cycle Priod [1006h]. This is the time interval between two consecutive SYNC objects. There is also another object called Synchronous ...
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1answer
88 views

Can multiple microinverters, connected in parallel to a single source, become unstable?

Just to get this out of the way, I realize that what I'm exploring is well outside the design specs for the hardware I'm using. Now that that's out of the way: I have a large lithium battery module ...
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2answers
133 views

Controlling high voltage devices with Arduino Relay module

Goal: I want to build a circuit that converts 700V DC supply to 700V pulses of 15ms duration. From what I have learnt from online, is that Arduino controller can be used with Relay module to control ...
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1answer
64 views

Confusion of terminology for control systems

I am confused about the following definitions (if there are any): Reference input reference signal setpoint reference I don't understand specifically what they are referring to. Do they refer to ...
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98 views

Optimum number of CANopen nodes in a CAN bus for motor control

I am studying about the CANopen implementation in a motion control work. CANopen is a protocol over tha CANbus. It is seen that, in the CANopen specification, theoretically at most 127 nodes could be ...
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61 views

Heater control circuit improvement

I am working on a control circuit for a heater. The circuit has a temperature controller (not included in the drawing), an overtemp controller, I/O going back to the PLC providing "heater ON" and "...
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1answer
41 views

Determining control voltage of variable gain amplifier to achieve fixed output amplitude

I am wondering if there are any well known methods for determining the control voltage of a variable gain amplifier required to achieve a constant amplitude output without requiring prior knowledge of ...
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56 views

555 timer circuitry

I have a 555 pulse generator controlling a relay going a little faster than 1hz. It is hooked up to start up when it receives positive voltage from the switched accessory circuit of a vehicle. That ...
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1answer
45 views

Boost converter control in DCM

I am trying to find a reference where a boost converter is controlled in discontinuous conduction mode (DCM) with constant duty cycle and by changing the frequency of operation. More specifically, I ...
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0-10v Lighting Control Test Rig for Lighting Control Systems - How to source 10vdc at 2mA?

If this has been asked previously, I have not yet found it. I've never posted here, so please accept my apologies in advance if this post isn't appropriately written. I'm building a test rig for ...
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Modeling scalar control of PMSM

I have met with a scalar control algorithm for a permanent magnet synchronous motor. I haven´t heard about it before so I decided to develop a dynamic model to further analyze this control algorithm. ...
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2answers
89 views

The Blue LED of ESP8266 glows continuously when connected to 5V relay output

I am a newbie. Need help on my project. I am building a project which controls a 5V relay from ESP8266 ESP-01. Since the GPIO2 gives the output of 3.3V, I am using an N channel MOSFET 2N7000 to ...
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3answers
82 views

dc voltage control for LED lights?

I'm looking for a little bit of help on a project I'm working on. I need to find some way to make led light bars (18w and 120w) to automatically start out dim and gradually brighten to full ...
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137 views

1. order system Gain

I have been assigned a task and I am having trouble finding the gain K. Here is the task: To the time t = 0, there is put a step at 3. Find the gain. Find the time constant. Find the time delay. ...
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74 views

Calculate torque from current induced in a single phase of a 3 phase AC Induction servo motor

I'm looking to measure the torque or slip angle on an AC induction (asynchronous) servo motor given the current induced in one of its phases. The servo and drive is yaskawa. Example data is shown ...
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In earlier tape recorders, how was tape spool angular velocity adjusted?

Tape recorders that use spools of magnetic tape transfer the tape from one spool to another as the tape plays/records. The spool with less tape must be rotated faster than the other. Here is such a ...
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67 views

How to compare power requirements for different control design approaches?

I am trying to fairly compare different control design approaches. As an example, below I present two similar but different techniques which are: Control system with state feedback Control system ...
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59 views

PI or PID vs Manual Controller design using Control theory

Why should we design a controller manually using Bode plots and control theory instead of using PI or PID controllers and tune them? Or more specifically when should I design a controller and when ...
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51 views

PI controller - DC voltage regulation

I a voltage source converter, in order to control the DC-Bus voltage a PI controller can be used. The control method is illustrated in the figure below: I would like to ask why the input of the PI ...
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How does a time delay affect the Gain and Phase Margin?

How does a time delay affect the gain and phase margin. Answers using nyquist plots would be helpful I know that a time delay of t corresponds to gain multiplying by 1 and phase subtracting omega*T . ...
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98 views

Constructing bode plot from experimental data and constructing a transfer function

I've been trying for a few days to convert an experimentally obtained (frequency against magnitude and frequency against phase) graphs to a bode plot and then construct a transfer function from the ...
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426 views

What is causing this long tail in the transient reponse?

I have a fifth order transfer function for which I designed a controller using pole-zero cancellation technique on a root locus. I am after <5% overshoot and <2s settling time. Currently, the ...
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51 views

Can a system have constant phase response other than +/- 90 deg (and multiples)?

I have seen frequency responses where amplitude response is constant( pure delay) and where phase response is constant(pure integrator). In an integrator the constant phase is -90 deg. In a pure ...
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Not sure how to go from PID error to PWM duty

I am trying to learn the basics of PID. I have made a contraption to try to implement a PID controller. I am not using carbon fiber, but rather a chopstick. So I am controlling the speed of the ...
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2answers
47 views

Digital control of contactors

We are trying to control a bunch of 3 phase contactors using an HMI. The contactors' coils are activated by two lines of the 240V 3 phase source (L1 and L2). We are trying to figure out if the ...
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1answer
235 views

Pole Zero Cancellation on a Root Locus

Question: ...design a controller in the feedforward path to minimise the effects of the two pairs of dominant poles. Use a pole-zero cancellation technique on a root locus diagram.... I have a 5th ...
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2answers
142 views

Stability at loop gain <1 and 180 degree phase shift

I'm reading this article about stability of OpAmps: Link to article. It says: "If Aβ is less than unity at the high frequencies where phase shift reaches 180°, the high-frequency phase-shifted ...
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116 views

How to use the Root Locus design method to improve the transient response of my system?

By closing the loop, I need to design a controller in the feedforward path to minimise the effects of the two pairs of dominant poles of the 5th order transfer function. Use a pole-zero cancellation ...
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1answer
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rlocus() - Not enough input arguments in MATLAB 2018a

I am following this tutorial on root locus methods and when writing: syms s sys = 1/(3*s^2 + 2*s - 1); rlocus(sys) I get: Error using rlocus Not enough ...
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How to find the optimal speed of a BLDC motor having hall sensors? Can we change the most efficient speed through the controller? [closed]

How do we find the speed of BLDC motor at which it has minimum electrical losses so that we design a gearing system accordingly. And can we change the most efficient speed of a BLDC motor to suit our ...
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246 views

Why does tracking different plant states result in totally different observer estimates?

I am trying to design a Luenberger observer (or a full state feedback observer) such that with one sensor available I can estimate all the states. A good tutorial is shown here. My system is 4th ...
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Steady state error due to disturbance

I was trying to solve a question from the 2004 GATE IN paper, I solved it this way, Now, the book is giving a different solution, I'm pretty sure my way is correct since they pulled the "standard ...