A system that may be electronic circuits or even software that uses control theory (principally differential equations) to control an output by monitoring various aspects of the system under control and varying inputs all towards meeting a defined goal. Some famous examples are controlling a ...

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control systems for electrical systems with matlab

I hope this question is not abroad. I've taken a course in control systems. Usually control systems books cover the control problem for a variety of fields (i.e. electrical, chemical, mechanical, ..., ...
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2answers
68 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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1answer
77 views

Mathematical model of the temperature of resistors/heatsinks?

I want to model the transfer function of a resistor mathematically, and am after some resources / tips on if it's possible to do so. For example, if I put 1V into a 1 Ohm resistor, I want to know how ...
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1answer
50 views

Lag compensator Design

I have system having unity feedback gain. Use a lag compensator to get 10% overshoot. settling time of 1sec. $$g(s) =\frac{0.1 s^2 + 0.7 s + 1}{s^3 + 6.98 s^2 + 9.86 s + 19.8}$$ Continuous-time ...
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2answers
111 views

How do electrical engineers actually apply control theory in real life?

I am currently taking a course in control theory. In control theory the system or impulse response is usually an algebraic expression in Laplace domain. Much of the work done in school is to find ...
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2answers
95 views

What does it mean to have a pole or zero at infinity?

what does it signify ? At pole/zero frequencies the response of a system goes to infinity/zero, so I think same is the case with poles/zeros at infinity, but how do these poles/zeros affect the design ...
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1answer
67 views

current control via microcontroller

I have a micro-controller which calculates and decides about the current each minute. Then for one minute the circuit must hold that current constant. Then it should control the current via a buck ...
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9 views

Averaging of state space equations for a multi input dc-dc converter

If I have a converter with one switch, then I can find the average state space matrices as A= kA1 + (1-k)A2 where A1 is matrix when switch is off and A2 when switch is off, k is duty cycle of the ...
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2answers
88 views

Stability of an unstable system using nonlinear element. Is it possible or not?

Say there is an system with open-loop transfer function $$G(s)=\frac{1}{s-1}$$ The system is definitely unstable. If I put an any nonlinear system in cascade with \$G(s)\$ & from the output, a ...
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0answers
26 views

Averaging of state space equations for a multi input dc-dc converter

If I have a converter with one switch, then I can find the average state space matrices as A= kA1 + (1-k)A2 where A1 is matrix when switch is off and A2 when switch is off, k is duty cycle of the ...
0
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2answers
113 views

Obtaining stability information from Bode plots

I am trying to understand the theory behind gain and phase margins from Bode Plots for systems with negative feedback, specifically this one: The transfer function for this system is: $$ ...
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1answer
63 views

Control theory: What is the physical interpretation of asymptotic stability

For Bounded Input, Bounded Output stability (BIBO), there is a very nice interpretation. All it means is that if for any finite signal the system produces a finite output signal, then the system ...
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39 views

Brushless DC motor or stepper motor for specific application

The specific application is for moving (or traversing) a carriage up and down a lead screw. The lead screw is rotated by a motor. Here is a rough idea: - Since 1996 a stepper motor has been used ...
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2answers
44 views

Control theory: What is the relationship between the number of elements in your system, and your diff'eq IO model and the dimension ABCD Matrix?

From my understanding, the order of your system is directly proportional to the number of elements in your system. Suppose I have a circuit containing 6 capitors/inductors Then the order of my ...
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0answers
41 views

implemented feedback loop to count pulses but loop doesn't work

I am implementing feedback loop which count number of pulses from optical encoder and convert it to rpm(speed). But i noticed that number of pulse count remains same irrrespect of the motor speed. I ...
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2answers
43 views

Why is any lumped parameter system modelled with an ODE?

I'm studying Control Theory and the book jumps from a input-output representation of the system to a ODE model. Initially, the book derives that any causal system can be represented as: \$y(t) = ...
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1answer
129 views

Optical encoder in Proteus

I am working on dc motor speed control project in proteus and for the feedback i am using optical encoder.Dc motor speed is calculated by counting pulses from encoder. But i wanted to know what is ...
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2answers
60 views

Identifying position transfer function for a DC motor

I am trying to identify a simple position/speed system based on the inputs and outputs using a DC motor equipped with a qudrature encoder.For the soft i am using xcorr and arduino blocks to apply a ...
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0answers
53 views

Can someone give me a definition of “agent” as used in engineering?

I went to a presentation today and part of it is about multi-agent system. I thought that the speaker would introduce the term but regrettably he did not. Can someone provide a definition of agent as ...
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1answer
64 views

Since the z-transform of the zero order hold is 1, why bother including it in analysis or simulation?

The z-transform of the zero order hold is 1. So why should it even be considered in the discrete time analysis or simulation of discrete time control systems? ...
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1answer
144 views

Using a Contactor or Relay to switch between two DC power sources?

I want to power a motor with a battery, however the complication arises as I want to have two power sources and be able to switch between them. The context of this problem is for an electric vehicle. ...
2
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3answers
94 views

What is the effect of aliasing in discrete time controller?

Suppose we have a controller whose TF is $$ G(s) = \frac{1}{(s^2+1)} $$ This yields two marginally stable poles at \$ s = \pm j \$ Now let's discretize the controller through z transform, after ...
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2answers
161 views

How to switch between two DC power sources powering a motor on an electric vehicle?

Background: For a university final project, my student group is investigating the possiblility of powering a motorcycle with two seperate batteries, each of a different chemistry (Lead-acid and ...
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3answers
131 views

Transfer functions with constant voltage sources in them?

I am trying to get the transfer function: $$H(s)=\frac{V_o}{I_i}$$ For the following circuit: simulate this circuit – Schematic created using CircuitLab I think I can get it without ...
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2answers
210 views

Make hard drive stepper motor run 7200 rpm

I have an old hard drive (7200 rpm) motor like this: I'm trying to make it run as fast as possible and I start with this code (arduino uno): ...
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3answers
205 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
70 views

When do we prefer Laplace signal form instead of time signal form - Control Engineering [closed]

I am struggling to see when you will prefer laplace transform X(s) instead of a time domain signal x(t). What does Laplace transform tell you? What is the benefits to use Laplace transform? What ...
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3answers
127 views

Implementing differentiation and integration in a digital control system?

In a computer control system (microcontroller-based), the sampling time of the inputs to the system determine whether to treat the system as a discrete system or continuous. From what I have learnt, ...
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1answer
65 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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1answer
94 views

Why can I ignore the “imaginary” value from the gain of my system?

I’m in the final year of my education, and for the exam training I had to find the K (or max gain) value of the given system when the desired damping ration equals 0,7. What i have done to addres the ...
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2answers
45 views

finding a system behaviour [duplicate]

Why is step response so important? for finding properties of a system we use step response of a system why we don't use other basic signals such as impulse or ramp? thanks for your responses.
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3answers
47 views

Does this article's appendix contain an error (is the heating system described integral control)?

I am confused by the primer on control theory found at the end of the following paper, which concerns an instance of integral control in a biological system. Since it concerns integral control, I ...
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2answers
75 views

regulator ac to dc with

I am studying for my EE exam ,I understand the general working of the circuit but there is some details about it I have to know. this regulator supply 24 volt with puissance nominale 200watt. it ...
2
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1answer
86 views

Effect of zeroes in system stability

Suppose we have two third order systems (a and b), with three poles and two zeroes,poles for both the systems are at the same positions in frequency domain but these systems differ in the placement of ...
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1answer
113 views

How to represent circuit in state space

I have this circuit and I must represent it in state space. I know the process because I have done similar ones but having trouble with this one. I have found the Kirchhoff equations for the 2 loops ...
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1answer
100 views

What is the difference between disturbance and noise for dynamic systems?

In most references from dynamic system theory, the following linear continuous dynamic system is considered. $$\frac{\text{d}x(t)}{\text{d}t}=Ax(t)+Bu(t)+Dd_{1}(t)\quad (1)$$ $$y(t)=Cx(t)+Ed_{2}(t) ...
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1answer
115 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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32 views

control circuit of humanoid robot: is it worth to learn and use ROS

i am building the upper body of a humanoid robot for my MSc thesis project with 24 dc motors and multiple sensors(something like i-cub or Nao) i have basic knowledge of communication protocols and ...
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2answers
57 views

What is the correct transfer function of a feedback loop if the summing amplifier has different input resistors?

Suppose I have a circuit below: simulate this circuit – Schematic created using CircuitLab I know the the transfer function of a negative feedback loop is: ...
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1answer
224 views

Using a transistor as a heater

I have the task to build and control 35 heaters, 10 W each. I first thought about using power resistors (like in this datasheet) as heating devices, but they'd need high currents in order to get the ...
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1answer
153 views

How to find the state-variable equations from the signal flow graph of the system?

How to find the state-variable equations, i.e, the state equation & the output equation for the system described by the signal flow graph below?
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1answer
56 views

General form of a Transfer Function

A professor is writing the general form of a Transfer Function as: $$k\cdot s^{l}\cdot \frac{\prod\limits_{i=1}^{m}(1+\frac{s}{z_{i}})}{\prod\limits_{i=1}^{n}(1+\frac{s}{p_{i}})}$$ but in every book ...
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1answer
58 views

Powering circuit with alternative and/or concurrent power sources

I have one of these led projectors which is normally powered by the embedded motion sensor. I want to be able to power it manually by a switch button. I need to do this in both alternative and ...
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0answers
40 views

How to implement a multiple controller system?

I want to make a system that switches between multiple controllers depending on a parameter 'x' in the system. Eg. If there is no noise use a pid controller. If there is noise use a resonant ...
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1answer
88 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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0answers
134 views

Finding transfer function of this signal flow graph using Mason's Rule

In the following signal flow graph, how do you find the transfer function Vload(s)/Idist(s) using Mason's rule? The solutions manual says it would be the same transfer function as if you were finding ...
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4answers
189 views

Why is the frequency complex

When we take the Laplace transform of a function, why is the frequency (s) complex? I can not understand the significance of complex frequency. Please help or give some references.
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1answer
184 views

Need suggestions on control system engineering [closed]

I am sophomore studying control systems and the problems given in the books( like Norman Nise ) look too easy. Please suggest some good book with really good problems.
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2answers
82 views

How do I hold a signal high from one high pulse?

Assuming I send a signal wirelessly to a receiver connected to a fan. if the receiver detects that a pulse is there, it switches on the fan. the fan should stay on until it detects another high pulse, ...
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2answers
1k views

How to calculate Kp, Kd and Ki?

The motor operates within 140 rev/min to 600 rev/min. The controller gives an output in the range 4 to 20 mA. The sensor output reading equivalent to 400 rev/min, actual reading was 404 rev/min. The ...