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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129 views

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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93 views

How to design analogue compensation for SMPS from Bode Plots?

In a complicated switched mode power supply where the transfer function is unknown, is there a way to design an analogue controller and compensation from the bode plot alone? I am having difficulty ...
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47 views

Adding foot control to tig welder

I've got a simple tig welder that uses a switch on the torch to start the welding current and a potentiometer on the front panel to set the amperage. Many welders make use of a foot pedal to start te ...
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1answer
119 views

Find transfer function and step function for this circuit

Can someone help me to find the transfer function of this circuit (i want to have the tension through the capacitor I think) and the step response in order to get the voltage in the function of the ...
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1answer
236 views

Control of interleaved boost converter

In a school project we will try to implement a control system for a boost power factor correction (PFC) converter. The converter circuit can be seen below (http://www.ti.com/lit/an/slyt517/slyt517.pdf)...
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1answer
998 views

How to plot Nyquist Plots?

By using the open loop transfer function for a control system, how would you then sketch the Nyquist plot by hand? I'm aware you'd substitute any \$s\$ term for \$j\omega\$ and then rationalise the ...
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30 views

How does shifting Product/Divide Block work?

I've just learned about PID MRAC using MIT Rule, and to build it in Simulink I need to use the Product/Divide Block. https://www.mathworks.com/help/simulink/slref/product.html This is a figure from "...
2
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1answer
58 views

Why do we ground the common probe on a 3 probe liquid level sensor?

I have a liquid level sensor with 3 probes, one us common, the other is for low level and the third is for high level. On the liquid level control relay diagram, I've noticed that the common probe ...
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50 views

What is a suitable hysteresis value and averaging period for a residential thermostat?

I've built a microcontroller based thermostat that I am using to control my home HVAC system. The actual programming and physical assembly has been straightforward. I'm using DS18B20 sensors, so I ...
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215 views

Mistake in published paper about magnetic levitation?

As I was reading through this paper: Nonlinear Model & Controller Design for Magnetic Levitation System, I stumbled cross section 3.3 which I could not follow. Summarizing section 3.3 Non Linear ...
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231 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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478 views

Controlling a 4 lane DSI display from RasPi 3

I have a DSI display which runs on 3 data lanes. Can this be controlled from a Raspberry Pi 3 which has a DSI interface that only supports 2 lanes? Looking for a yes or no with a reason. If you have ...
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67 views

Designing PID to reject load disturbances of dead-time process

I am using the PID Tuner for the PID Controller Block in Simulink. I am particularly interested in the output disturbance BODE plot. I am trying to achieve an acceptable output disturbance with the ...
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982 views

How to drive electric power steering motor

I want to drive an electric power steering motor from an European Opel Corsa C in a way that I can control the steering of the car programmatically. I have a steering angle sensor which I will to use ...
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141 views

How to tune PID for a Y(t) = k*X(t) system?

Could I have your opinions on PID type selection? System description Here comes a very simple system: Output(t) = \$ k * (Input(t) + systemVariable(t)) \$. \$k\$ is constant and \$systemVariable(t)\$...
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1answer
298 views

Connection between PID, Pole placement and LQR

I am trying to control a wheeled inverted pendulum with a PID controller. I already designed a linear quadratic regulator (LQR) and a pole placement regulator (PPR). I would like to design a PID ...
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1answer
1k views

High Power H-Bridge with IR2125 Drivers Problem

I'm currently stuck on a problem when trying to drive a 140V DC motor using an H-Bridge with 4 high-power mosfets and 4 IR2125 drivers. I'm using as input to the drivers a signal generator of 5V in ...
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23 views

limitations on control effort

I am looking at loop shaping design of a control system, and I'm focusing my attention of the control effort. I have seen that it can be identified with a function called control sensitivity function ...
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34 views

Problem with performances of a control scheme

I am trying to prove with Matlab that if I have an improper system and I place poles at higher and higher frequencies the performances of the system improves. In particular I am considering the ...
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22 views

Phase control circuit (U111B replacement) for AC motor

I try to repair an old potter's wheel electronic board based on "Phase control circuit" U111B. (An other U111B datasheet here) After changing 60% of components, the PCB is delaminate and I think it's ...
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1answer
133 views

Phase margin is 90 degrees but transient step response shows overshoot

The bode plot of the loop is as shown here The transient step response looks like this The block diagram looks something like this - Basically a single stage opamp(OPAMP in fig) with high gain(...
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24 views

Fixed Frequency Control of Multi-Resonant Converters

I am currently designing a SMPS based on the half-bridge LCC converter. Due to my application, it is desired to operate the converter at a fixed frequency. I also wish to optimize the passive ...
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37 views

Stability of Buck Converter when output capacitance is variable

I am designing a buck converter for an application that has several different loads. Depending on what devices are connected, the capacitance seen at the output of the buck converter can vary ...
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24 views

Is it possible to predict the operating state of a power system (using MATLAB) if I have calculated the voltages at all nodes by state estimation?

If I have calculated all the node voltages by state estimation, is it possible to predict which operating state my system is at? By operating state, I mean any of the following: ...
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62 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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115 views

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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2answers
370 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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51 views

What is the meaning of the first gain in the block diagram?

I have do design a circuit based on the block diagram below. I know how to design the PID part but I don't understand what the K=2 is. For the PID I have made the following:
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82 views

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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62 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
235 views

How to tackle noise with PI controller

Updated: I am not sure if the title fits my inquiry here but I will try to explain. I have this system show in Fig1. It is a simple plant \$\frac{1}{as}\$ (expressed in the frequency domain). Then I ...
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63 views

Nonlinear system general representation

I am fairly new with non linear systems. I understand that a general representation of a nonlinear system is: $$ \dot{x} = f(x) + g(x)\cdot u $$ where \$x\$ is the state variable, and \$u\$ the input....
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468 views

Designing PID controller for 2 servo motor synchronization

I am trying to use a PID controller to synchronize wheel speeds in an arduino-bot so that I can get it to drive straight. I am unsure how to approach this problem without knowing the physical ...
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1answer
62 views

The system is not completely reachable, Is state x1 reachable from x0?

The system is $$ x(k+1)=\begin{bmatrix} 1 & 1 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{bmatrix} x(k)+\begin{bmatrix} 0 \\ 1 \\ 1\end{bmatrix} u(k) \\ y(k) =\begin{...
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97 views

Why are chokes nonlinear around 0A ? What inductors do not exhibit this behaviour?

I want to demonstrate that I can control the current in the winding of my single phase motor (a limited angle torquer) with a bandwidth greater than 3kHz. The phase resistance of the motor is 20Ohm, ...
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142 views

PID tuning single input two output with changing setpoint

I am operating the process in the image below, where I am using a recirculating heated/cooled bath (RHCB) (Polystat 12122-56) that externally circulates hot water through a heat exchanger (HX) and ...
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831 views

How to control power to a nichrome wire coil heating element with 12V DC and 5A Max current

What is the best way to manually control the power to a nichrome wire coil heating element with 12V DC and 5A Max current. I am looking for a simple and efficient way to control it with a knob for ...
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130 views

Linear actuator - Wiring and control

I have to use a linear actuator in my project and according to my need and availability I found this Linear actuator MEGAMAT2. This requires 24 V supply. But I am unable to understand the pin ...
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2answers
782 views

control systems - state space representation using transfer functions

I am trying to manually get the state space representation of an RLC network. I often end up with a bunch of differential equations that I can't relate to each other. I think it would be easier to ...
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707 views

Design of a half bridge converter

I am trying to design a half bridge isolated DC DC converter but I am encountering some issues. Is there an effective way to come up with a minimum value of capacitors C1 and C2. In all the papers ...
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184 views

How precise are ESC's?

I was wondering about the precision of ESC's. Specifically can I ensure their output motor RPM from different ESC/motor pair is the same function of pwm, assuming I have accounted for the specific ESC/...
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104 views

Connecting/disconnecting AC signal via uC

I want to mix up to four AC signals, that may or may not be DC biased, but will always be between -5.6 and +5.6. For that I was going to use a summing amp. (If anyone wants to talk me out of that in ...
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192 views

Using a suitable Compensator problem - Control Theory

Problem: \$\,\,\,\$ A system is described by the open loop transfer function $$\frac{k(s+2)(s+7)}{(s+5)(s^2+2s+5)}$$ Design a suitable compensator in order to have \$w_n =\sqrt{10}\,rad/s\$ and \$\...
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3k views

What is a Thyristor Switched Series Capacitor (TSSC)?

I'm struggling to understand the physical difference between the Thyristor Switched Series Capacitor (TSSC) and the Thyristor Controlled Series Capacitor (TCSC). From this book, I understand that a ...
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1answer
519 views

Why the driving point functions have the condition that the degree of numerator and denominator only at most differ by one?

I do not understand the logic behind this restriction. What would go wrong if this condition is not fulfilled? E.g, in frequency domain \$\dfrac{1}{(s+1)^2}\$ which has an inverse Laplace of \$t \...
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26 views

What is the meaning of the singular values?

I am studying MIMO control systems, and I have seen that the Bode plot of these systems is composed by the various singular values. But I have not clear the meaning of these sigular values. What I ...
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20 views

Doubt on how to do well done loop shaping of a control system

I am studying control systems, and I have some arguments that are not clear. In particular I am studying the loop shaping design using H- infinity controller designed with muxed sensitivity, in SISO ...
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2answers
64 views

Reading a high-speed rotary encoder with a Raspberry Pi

I'm trying to setup a Raspberry Pi to measure the position and speed of 8 DC motors that all have incremental quadrature encoders. At full speed (unloaded), each encoder ticks at 3.3 kHz. I assume ...
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20 views

Problem reading control effort frequency response plot

I am trying to plot the frequency response control effort of a control scheme in Matlab, and in particular I want to do this for different values of tau, which is a constant used to add a pole at high ...
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29 views

Forward path gain

Consider a simple circuit consisting of a pair of wires, where input voltage is equal to output voltage. Here forward path gain is G(s) = 1 ,(fig.1) which gives g(t) = δ(t) {Inverse Laplace ...