Questions tagged [feedback-loop]

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Can an electric motor act as a load for the electric generator rotated by that motor?

I have an experimental generator and an off-the-shelf motor that I intend to arrange like in Fig. 1. The problem is that if I connect the required load to the output of the generator the power drawn ...
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1 answer
38 views

How to determine the components of a feedback control loop given following context?

Based on this feedback control loop where $w$ is the desired setpoint, $x$ the process variable, $e$ the error value, $y$ the correcting value and $z$ the disturbance value. Did I interpret the ...
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Steady state error of negative feedback system - zeroes of feedback function

I am currently studying control systems from the KUO - GOLNARAGHI book. Regarding the steady state error the book makes the following distinction: Feedback function H(s) has no zero at s = 0 Feedback ...
0 votes
2 answers
49 views

What is a "Unidirectional Input" (?) Closed Loop Control Algorithm Called and How Does it Work?

PID systems inherently require some amount of overshoot in order to stabilize around a target. This often requires adding or subtracting some resultant term in order to shrink the relative error. ...
0 votes
2 answers
38 views

How does feedback implementation look like in a real word closed- loop process?

I'm looking for a generic term/process that explains how we can make a closed- loop control system. The typical elements of a closed loop systems are controller, actuator, plant and sensors. If you ...
0 votes
0 answers
87 views

What is the feedback signal used in the speed control of a brushless DC motor?

In a brush-less DC (BLDC) motor the commonly used speed is sensed using the feedback from Hall effect sensors and the back or counter EMF. The linked article on Wikipedia also mentions that 'Other ...
2 votes
3 answers
315 views

How to convert a DC motor into a servo motor using a rotary encoder and a microcontroller?

Operating/ Rated Voltage: 24V No load Speed: 350 rpm No load Current: 150mA (max) Max efficiency: 1.4 Kg-cm/300 rpm/ 14.2W/ 0.87A Max power: 4.5 Kg-cm/180 rpm/28.2W/1.4A Stall Current: 2.9 A (max) ...
1 vote
1 answer
28 views

What does "analytical design" mean?

What is meant by "designing analytically" ? Especially in control systems design Does it mean theoretically design?
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1 answer
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Is it true that points of root locus only satisfiy the angle condition?

So , I was reading a course book : ''Modern Control Engineering '' by Ogata and I came forward this statement that made me skeptical: ''The points of root locus only satisfiy the angle - condition. ...
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1 answer
36 views

Feedback Control Question: Finding compensator numerator (B(s)) and denominator (A(s)) polynomials to satisfy a specific requirement

I wish to find the polynomials B(s) and A(s) in the following compensator equation: A(s)D(s) + B(s)N(s) = F(s) Given, $$N(s) = s - 2$$ $$D(s) = s^2 - 1$$ $$F(s) = s^2 + 3*s + 4$$ Condition The degree ...
2 votes
1 answer
197 views

Feedback loop and zero - error in steady state

I need help with this exercise. I 've tried many times with pen and paper but I'm stuck. I don't want a full answer but some feedback . Here is my progess: $$\frac{dx}{dt} = Ax(t) + Bu(t) \Rightarrow ...
0 votes
1 answer
141 views

Tuning Feedforward + PID Controller just with Feedforward Data

Hello there, hope you are all doing well. Right now I am trying to design a Feedforward + PID Controller for KUKA youBot on simulation. Since I do not have the equation of the system, I am trying to ...
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1 vote
1 answer
130 views

How can I get final value of $V_{out}$ at $t=∞$ in RC circuit?

I can obtain the transfer function in this RC circuit. $$ \frac{V_{out}}{V_{in}} = \frac{1}{(RCs+1)} $$ When $V_{in}$ is set to $10V$, how can I get final value of $V_{out}$ at $t=∞$? I tried to use ...
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-1 votes
1 answer
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Crossflow HX tube and fin, derive Tout hot side as a function of mdot hot side in

Apparatus: Crossflow Tube and fin HX. (liquid-to-air Intercooler), Hot Side: Tube side, gas flowing internally Cold Side: fin side, water flowing in crossflow Goal: Generate an environment in "...
0 votes
2 answers
116 views

mass-friction-spring system with closed loop

My professor told us that it is possible to see the friction in a mass-friction-spring as the contribution of a closed loop control system. He wrote the following formulas: Transfer function: $$G(S)=\...
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0 answers
34 views

Low accuracy current feedback measurement in motor control

Given a very low accuracy current sensor in a 3 phase inverter (in my case used for motor control) what is the best way to tackle the issue and keep reasonable performance and robustness at the same ...
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1 vote
1 answer
225 views

Physical interpretation of a Bode plot

I have a few questions regarding the physical interpretation of the information presented on a Bode plot. I believe it is one of those cases where I "don't know what I don't know", so please bear with ...
1 vote
1 answer
108 views

How to repeat on ABAQUS FEM simulations without reloading the mesh?

I would like to perform several FEM simulations on a given mesh with ABAQUS, where only the orientation of an element set would change in between. Currently, I'm just generating several inp files (...
1 vote
1 answer
484 views

What 's the function of COMP pin(Pin 3) in LM5030 - Push Pull IC?

I'm a student. Now, I am learning to use LM5030 IC to design a Push-Pull converter. So, I read LM5030's datasheet and can not understand the function of COMP pin (Pin 3). The red line is Feedback ...
3 votes
2 answers
6k views

Can a PID controller have a simple on/off output?

The crux of a PID controller is:- output = Kp * error + Ki * integral + Kd * derivative So typically there is proportionality and a continuously varying (analogue) output. In the case of a simple ...
3 votes
1 answer
160 views

Finding stability of open loop system connected to closed loop system

I have a simple cruise control closed-loop system with negative feedback and have no problem using the Nyquist stability criterion to find its stability. However, I have another function that ...
1 vote
2 answers
1k views

Calculating a derivative in a loop?

I am not sure where else to post this, so here goes. I have a velocity profile ($v_{\phi}$) for a radial distance ($r$). From this velocity profile I am trying calculate the shear rate ($y$) which ...
0 votes
1 answer
758 views

What type of control system is this? open loop?

Suppose I have a liquid in a container, the type of liquid is such that it expands when its temperature rises. The contrainer is marked with scale to measure the height of liquid expanded. There is a ...
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1 vote
1 answer
47 views

What is the name of my feedback procedure in control system that I am using?

I have created a self balancing robot. It uses PID control to control its pitch angle and gets the feedback from gyroscope and accelerometer. But I have not used any sensor to feedback the ...
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2 votes
1 answer
740 views

Is lead filter same as PD combined with a low pass filter?

I am curious to know the difference between a lead compensator (lead filter) and a PD controller with a low pass filter. From the theory I can see that the transfer function of both these controllers ...
1 vote
1 answer
1k views

Closed loop response of a discrete system

I have trasfer functions of a plant and a controller in laplace domain. I checked for the closed loop response by applying a step response. The system is found to be stable. I checked the response ...
6 votes
1 answer
727 views

mass calculation from transfer function or bodeplot

I have a double mass rotary model. The two masses are connected by an axis which together acts as a spring damper system of the fourth order. The system is actuated by a motor and the angle of ...
5 votes
4 answers
3k views

Why can't proportional gain alone, reduce the error to zero?

I was told that the proportional gain alone cannot the drive the error signal to zero in a feedback loop. Why is that? If there is a tiny error, there will be a tiny or larger (depending on the number ...
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2 votes
1 answer
2k views

How to improve a PID control loop by adding feedforward?

Assume you have a system model that is controlled by a PID controller (feedback). You want to add feedforward to improve the characteristics of the controlled system. How can you design the transfer ...
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5 votes
1 answer
618 views

Is active noise cancellation useful in vehicles?

The cabin noise of vehicles is a large concern in the luxury market. Why haven't any automakers used the same techniques as are employed in active noise cancelling headphones. In these devices a ...
3 votes
1 answer
811 views

What is the effect of changing the angle of a helicopter flybar?

A helicopter flybar is a kind of gyroscopic stabilizer which acts in feedback to the pitch of the blades. The effect, in words, is that as the helicopter starts to pitch or roll in a particular ...
4 votes
1 answer
327 views

Given drive rotation angle, controlling torque, how do I maintain movement speed with varied load?

I'm working on design of a 3D movement drive (for 3D printers/CNC mills etc) using DC motors and helical drive. A DC motor drives the leadscrew actuator which supports the working elements (head, ...
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