A PID controller is a (closed) control loop feedback mechanism. It is used in industral control for proportional, integral and derivative feedback.

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BJT or Mosfet for PID

I want to build a PID controlled Servo valve. I can't choose driver transistor which is best for linearity , fast response, working life. BJT or Mosfet? This is the amplifier schematic In the ...
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112 views

A current controller by regulating the voltage

I need some idea of what type of controller I should use. But, I am thinking of a PID controller. Here is my problem: I have a simple circuit like this one: simulate this circuit – ...
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8answers
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Why are there only PID controllers, no PIIIDDD (higher order) controllers?

Transfer function of a PID controller is: \$I\cdot s + P+\dfrac{D}{s}\$ Are there controllers like: \$A\cdot s^2 + B\cdot s + C+\dfrac{D}{s} + \dfrac{E}{s^2}\$ ? If so, are they common? Why do ...
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23 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 ...
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2answers
30 views

Cascade Control System - Multi-Stage Temperature Control

I am new to the forum, hopefully you can help :) I am a software engineer trying to put together a control system. My controls background is not strong, I have really only tuned PID loops via trial ...
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1answer
53 views

PID controller DC motor Design using simulink [closed]

After playing the circuit, this circuit is showing the error. Tell me what is error in this circuit and what should be the P, I and D values for PID. ??? in block is not any error. It showing because ...
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2answers
60 views

how to map a pid controller to a process

How do you "map" the output of a PID controller to a process? Say you have a resistor, a thermometer, and a PID controller. The thermometer provides feedback, and the PID controller can control the ...
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39 views

Control of a single-phase PWM inverter

When designing a controller for the canonical DC-DC converter, I found a good number of models (linearized transfer functions) that could be used to design a compensator. I am attempting to do the ...
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1answer
53 views

Integral Time and KI in PID

I am working on drive to control the speed of motor using software PID. the output of PID will generate the reference for drive to run at particular speed. Here Kp and Kd will come from drive it self. ...
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1answer
301 views

Integral and Derivative terms in PID control

Integral Term My understanding of the integral term is: Sum of all errors since we started counting. So, even though we have reached our desired final target position, the integral of the errors ...
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48 views

What should be output of PID

I have developed code for PID control for the motor speed control using drive. Speed is being controlled as per the pressure setpoint and actual pressure. My PID output remains at 100% when there a ...
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2answers
57 views

control 2 outputs with a single input and pid

Overview I'm trying to levitate a constrained permanent magnet with 2 electromagnets. I'm having trouble conceptualizing the control system for such an operation. Setup The permanent magnet is ...
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44 views

Tuning rules for IT1 System

currently i am working on my Bachelor's Thesis. Its topic deals with finding the optimal parameters for a certain PID-Controler, which is used to control an IT1-System (to be more specific: a ship's ...
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2answers
73 views

Find system behavior: P or I type?

In control theory, how do I find out of which type a system is? P-type or I-type (P = proportional and I = integral) Consider the following nonlinear system with x as output: $$ \dot{x} = A(x) + Bu ...
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1answer
90 views

PID control of NiCr wire

I need to design a controlling mechanism for heating a nichrome wire of 15 cm (to be specific 36 gauge NiCr wire ). These are the following constraints 1)The Power source is 5volts from USB in PC. ...
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6answers
957 views

PID algorithm: how to account for fast input value changes after a long delay

I am trying to implement a basic PID algorithm on an Arduino Leonardo to mix hot and cold tap water using servo-controlled valves. The goal is to hold the temperature as close to a setpoint as ...
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0answers
34 views

Can set point weighting be used with multi-loop PID controllers?

The figure bellow shows an example of a multi-loop PID controller without set point weighting: The idea is that the outer loops define the set point for the inner loops. Set point weighting is the ...
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1answer
50 views

Control Engineering: Model parameter estimation for a motor which will be under various loads

I am creating a closed loop controller for a motor which is part of a robotic arm. I give it a required angle, the controller calculates a control input, the motor moves, a pot feedbacks the angle, ...
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1answer
64 views

Design of PID control for a vibration exciter (shaker) without having the plant model

I want to design a PID controller for a shaker. But I don't have the system's differential equation or transfer function. I find the system identification algorithms complicated. Can I design a ...
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2answers
50 views

Normal Control and Inverse Control PID

I am trying to find out the difference between normal control and inverse control PID. I couldnt find useful information on inverse control. I developed normal PID using ...
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2answers
155 views

Stepmotor closed loop - matching encoder and microstep resolution

I am trying to get a high accuracy and not so extremely high resolution motor to work. It's a step motor with 200 steps/rev and the motor driver can compute up to 400x microstepping. We have an high ...
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1answer
41 views

PID tuning limitation

I am modelling an Automatic Cruise Control model in Simulink. I used the PID block and tuned the parameters by trial and error. Now the tuned PID controller works for input speed ranges from 40 kph to ...
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2answers
161 views

PID Control implementation for charging battery really necessary?

If one is to make a battery charger, lets say a Li-Ion battery charger (using a micro-controller with buck converter), is it necessary to do some kind of control implementation inside the ...
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Compute minimum of an Error function

I have an Error function for my P controller as following (in Z domain): \$E\left( z \right) = \dfrac{{z\left( {z - 0.286} \right)}}{{\left( {0.713{K_P}{z^4} + z - 0.286} \right)\left( {z - 1} ...
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1answer
128 views

Difference Between Integral Time and Ki(Integral Gain)

Can anyone tell me the difference between integral time and integral gain? I am really confused between these two terms and it's extremely important for the software PID for motor speed control I am ...
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3answers
385 views

Kp, Ki, Kd for software PID control

I am designing a software PID control. Logic is almost final but I wonder how do I decide the value of \$k_p\$, \$k_i\$ and \$k_d\$. Also, I need to determine the max and min value for the Pterm Item ...
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2answers
377 views

How To Interpret PID Output in a Slow Response System

@Update: A few days have passed since I asked this question and I've had a chance to do some research based on the answers I've received from @R Drast and @Spehro. I'm not sure this update is the ...
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1answer
47 views

What is this process called: Analog input, with a analog output with setpoint

What is this process called: In my example the analog input represents line current. The analog output represents voltage. this is a closed loop with a target set point. The behavior would be that ...
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2answers
190 views

Designing a PI controller for a first order system

I have a first order plant $$ b/(s + a) $$ That I'm trying to control using a PI controller $$ \frac{(K_ps + K_I)}{s} $$ I closed the loop with unity feedback to get this Transfer function ...
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219 views

12v dc motor transfer function

I am working on a dc motor speed control project in proteus. And currently i am doing the tuning of PID controller and for tuning i am trying to figure out the transfer function of dc motor. Now what ...
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21 views

PID contollers and MIMO systems [duplicate]

I have a system which in state space model. There are 3 state variables and first I will make a solution without using any controller, in this case I have 3 input (u) U1=10,U2=0 and U3=5 , in this ...
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77 views

PID controler and state space model

I have a system which in state space model. There are 3 state variables and first I will make a solution without using any controller, in this case I have 3 input (u) U1=10,U2=0 and U3=5 , in this ...
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1answer
291 views

Magnetic Levitation

I am new to electronics, and I want to do a project where I make a device that levitates an object with the use of an electromagnet, for learning purposes. Something like this is what I had in mind: ...
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276 views

How to design controllers “properly”?

It may sound like the "easy way" to ask it here, but this question (along with a couple others I've posted which were more specific) is the result of years of research on the topic - on and off as ...
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1answer
73 views

Lead-lag process control

What is the locus of the following system, and for what value of \$\alpha\$ is the damping ratio 0.5?
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5answers
199 views

Convert Single OPAMP PID to Software implementation

I have a number of analog PID implementations that I need to convert to software. In an typical example (given below), the summing junction is used to get setpoint-measured error. In decoding the P ...
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1answer
74 views

What would be the best microcontroller for running PID calculations? [closed]

I need a microcontroller for my line following robot. Which one would be the best considering a price below $30 and preferably >120MHz clock?
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1answer
161 views

find RPM from Pulse of motor [closed]

I have an electronic gearbox motor with the following details: 25GA-370-12V -330RPM I want to find a PID control for this motor in Matlab. I take data from this motor by Arduino Due driver and an ...
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2answers
84 views

PID tuning without transfer function [closed]

I want to develop a general PID not for any specific appilications. What algoritham can be used to to so? ie If I dont have a specific plant model what algorithams can be used to tune a PID so that it ...
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2answers
225 views

Why does my 24 volt DC servo motor run at 5 volt DC and not at 24 volt DC?

Why does my 24 volt DC servo motor move with 5 volt DC drawing 5 amps, but does not move with 24 volt DC? The power supply is 24 volt DC up to 10 amps. Datasheet are available for the DS4S servo ...
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621 views

Transfer Function of PI Controller

Circuit below is an op-amp summer combined with PI controller. simulate this circuit – Schematic created using CircuitLab What is transfer function of this circut? How to calculate each ...
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1answer
286 views

How to determine the transfer function of a system including disturbances

I'm trying to determine the open-loop transfer function of the system below (in order to determine PID gains). If I account for the disturbance \$(9.81*6700)\$ in the system and use equation 2, I ...
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269 views

Help with PFM with PID Control on dsPIC30F2020 (Pulse Frequency Modulation)

I'm using the dsPIC30F2020 trying to do a project that compares and contrasts PWM and PFM bucks converters. I have the PWM buck converter working perfectly. So for the PFM I used the exact same code ...
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140 views

24VDC servo motor does not start

I have a 24VDC servo motor (servo motor specs) I want to use to move a small linear stage. The servo output is 20,6W. It requires 5000steps per revolution. I have the motor connected to a servo ...
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1answer
327 views

Temperature stabilization with PWM , PID controller with delay system

I am doing a project to control the temperature with PWM. I use peltier, thermistor,mcu and h-bridge mosfet. I want to reach a temperature with an error less than 0.05 and stay at that temperature ...
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162 views

Converting PID value to Kp Ki Kd from CENTUM 3000 YOKOGAWA

Here it is, I got the values of Proportional Band (PB) = 500 and Integral (I) = 10 from Non-Interactive PID Controller. What i need is to convert those values into Kp and Ki. I have already known that ...
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137 views

Desired response of PI controller in motor vector controller

In vector control (field-oriented control) of motors (specifically induction motors), a rotating reference frame is attached to the rotor flux to give "DC" values in the current controller. This ...
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41 views

Anti-windup scheme for PID controller [duplicate]

this is the designed pid controller and i am using TL084 op-amps which has +15 volts and -15 volts as their supply. when the error is generated, due to integrator the control signal(Vc) output is ...
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4answers
455 views

Anti-wind up scheme in the implementation of PID controller

I want to implement designed PID controller. But I am facing the problem of how to limit the saturation limit in both positive and negative direction? I tried using zener diode, but I would like to ...
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2answers
187 views

How to calculate the reset time?

I have a little difficulty on my project. Can I calculate Reset Time (Ti) if I just had the value of P gain, I gain, D gain, Process Variable, and Manipulated Variable? Is there any reference about ...