Control refers to systems that control other systems, whether that be industrial machinery, lighting or devices used in a home

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20 views

Is there experimental kits for semi-active suspension systems(quarter car)? [on hold]

My graduation thesis is about controlling a semi-active suspension system. I modeled it and theoretical part is done. Now I need to test it on a real system. Where can I begin to build them? Is there ...
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2answers
40 views

What is the reason behind transfer function representation valid for only LTI system?

One of the major advantages of state space representation is the fact that it can represent non-LTI system as well. I tried searching a lot to find a reason but couldn't get a reason explicitly ...
2
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2answers
62 views

Oscillation between the inverting input and output of opamp

I am looking into a circuit simlar to what is attached here, when I place a probe between the opamp's output and the inverting input - I see oscillation when V1 = 0V. But when voltage is applied to V1 ...
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47 views

Op amp controlled linear voltage regulators [closed]

Please can somebody send me any useful links in order to teach myself about Op amp controlled linear voltage regulators ? I must design and simulate an op amp linear regulator circuit using a 5v zener ...
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1answer
35 views

What are the tradeoffs between control vs software algorithms (in charge pump PLL)?

I have a grid signal (45-65 Hz) that I've sampled with an ADC and put it through an IIR LPF so that noise does not effect the zero crossing detection. All I want is the frequency of the signal. Now ...
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0answers
27 views

Thyristor controlled rectifier (TCR) and thyristor switched capacitance (TCS): Why do we need them and how do they work?

Meaning of TCS and TCR in the context HVDC and power systems? I read somewhere that they are to control amount of inductance and capacitance on the line. If this is the case, how do they work?
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0answers
33 views

Noiseless electronic ceiling fan speed control

Is it a good idea to control speed of a ceiling fan by letting the TRIAC run in PWM mode as explained? The TRIAC is allowd to pass the current for a complete cycle of the mains and then stopped for a ...
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49 views

Digital Buck Control

I wish to emulate a voltage mode buck control using FPGA. My idea was to obtain a discrete state space equation that can be implemented digitally. At first I calculated to the buck small signal open ...
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38 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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1answer
55 views

Calculating DC Brushless Motor Position

I am using a brush-less motor in one of my projects and I need a decent method of sensing the motor position so I know what coils to turn on and off. I looked a bit into sensing Back-EMF, but I did ...
2
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4answers
106 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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0answers
16 views

Communicating between a computer and multiple Arduinos [migrated]

I am designing a experiment of controlling 6 small wind turbines wirelessly. For each wind turbine, I need to measure power time series (or voltage or current time series) from the generator, and ...
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0answers
38 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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2answers
77 views

How to simplify this block diagram to get the given transfer function?

Given this block diagram, I'm trying to derive the transfer function. I've tried moving the 2 branch to either side of the then getting something like this But I'm not sure how to simplify it ...
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2answers
59 views

Finding transfer function of this RL circuit

Have a look at this circuit. I am to find the transfer function which is defined as \$V_L(s)/V(s)\$. Now I don't understand the solution. First of all, it defines \$V_L(s)\$ at the bottom as ...
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2answers
156 views

Slow down stepper motor's speed using stepper driver DRV 8825

I've got a Nema 17, rated at 0.8Amps, stepping angle of 1.8 degrees. The motor looks like this, and has six wires coming out of it: The four wires I've used are the ones labeled below (I was ...
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1answer
110 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
103 views

How do I control several individual LEDs with Arduino?

I am working in a book store and I have the task of making an indication of a book place in the Library Cupboard with LEDs. I need to control about 300 LEDs with Arduino. What is the optimum way to do ...
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2answers
158 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 ...
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1answer
61 views

Transfer Function: State Space for DC motor

General question on making state space equations for a DC motor. In the link below, why are both the electrical and dynamics equations 3 and 4 used to make a state space eqn.8, instead of combining ...
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1answer
51 views

How do I enable/disable a running 555 astable oscillator with a control signal?

I am going to control a fan using PWM signal. PWM is generated by a 555 IC. The duty cycle rate of the PWM is controlled by a PTC thermistor. And an NTC thermistor decides when to turn on and off the ...
3
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1answer
218 views

Linear Regulator: MOSFET vs BJT

Currently I am doing a project on a voltage regulator. Can you tell me some advantages of MOSFETs over BJT? Apart from a higher power loss, I can not find much. In control engineering it is much more ...
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1answer
74 views

Response of a stable second-order transfer function to a unit sine wave input

In the lecture slides from my university it says that: "The response of a stable second-order transfer function to a unit sine wave input is:" ...
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1answer
42 views

When do I have to use rectifier-inverter, and when is “dimmer circuit” sufficient in driving AC motor?

I'm trying to design a device that is to use a variable speed 1-phase AC motor. I still haven't decided upon power and other parameters of the motor. I have a few models to choose from, with "bigger ...
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2answers
206 views

130V DC Motor Control

I am interested in building a control circuit for a motor. More specifically this motor. The model I want to control is the 130V model, 0.48A, which should make it at ~62W for the motor, and 1/17 ...
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2answers
52 views

Model and Control of a Physical System [closed]

Suppose i have a physical system (set of interacting elements ) that i want to control. Best thing we can do to understand this physical system and hence control it, is to model it. We ...
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1answer
82 views

Contact arcing, how to avoid?

Recently my water heater's thermostat failed. It's just a simple mechanical one, with a piece of metal that "pops" and connects or disconnects the heating element. I would guess that what made it ...
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2answers
468 views

How do I find the second order transfer function from this step response diagram?

I have the following diagram of a system's step response: I'm having trouble understanding how to calculate the system's transfer function, given this diagram. Specifically, I don't understand how ...
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1answer
133 views

does Tera Term handle software flow control internally? [closed]

The title may be a little confusing but i'll explain the situation: We have the following situation: ARM MCU -> UART -> FTDI chip -> USB -> PC -> Tera Term terminal The FTDI chip has built-in hard- ...
4
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1answer
112 views

Practical Limit of Feedback Control Systems WRT Bandwidth

In a digital feedback control system, I'm interested in the practical limit of what the correctable bandwidth is. For example, given a very simple system: A sensor can sample a simple X position ...
2
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3answers
116 views

What is the usefulness of Internal Stability?

In the analysis of a feedback control system is it important that a sub-network be itself stable. i.e. if I were to break apart the main complex system and just study a single feedback loop, is it ...
2
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6answers
762 views

How to create an electronically controllable resistance to a physical movement?

What is the best way to create an electronically controllable resistance to a physical movement? For example, at the gym you control the resistance to movement by putting more load, more weight. Is ...
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272 views

How well does a Variac work for fan speed control?

I would like to run a standard multi-speed desk fan at a lower speed than its minimum setting. On Amazon, one reviewer recommended a variac for fan control, saying that it could adjust the fan from ...
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1answer
67 views

Digital Control Engineering book recommendations [closed]

What are good books on digital control engineering specifically? I'm a third year electrical/computer engineering student who will be doing a course on digital control next semester, but would like to ...
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1answer
61 views

Stepper Control using DC Brushed Motor Driver

Is there any way to control a bipolar stepper motor using one or more DC brushed motor drivers? My only interface to the motors is setting an integer to represent their speed, ex -100 to 100. I ...
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1answer
137 views

PID controller modelling

According to the following simple PID control system: We could create the equation: $$(R(s)-Y(s))C(s)P(s) = Y(s)$$ Wich will lead us to $$\frac{Y}{R}=\frac{CP}{1+CP}$$ So, if we want to ...
2
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2answers
394 views

Voltage regulator vs. voltage controller

I frequently meet the references to voltage-regulators and voltage-controllers. However, looking at the specs I find them to perform the same function. Is there a difference between the two, or ...
2
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1answer
75 views

Determine the robustness of a controller

How do I determine whether a PID controller I've designed is stable? How do I determine its stability due to the transfer function it's being applied to, and how well it rejects disturbance and ...
3
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1answer
75 views

Observer Based Control System Design

Consider the discrete-time system described by $$ x(k+1) = \begin{pmatrix}0 & 1 \\ -2 & -3\end{pmatrix}x(k) + \begin{pmatrix}0\\1\end{pmatrix}u(k) $$ a) Find a feedback state vector that ...
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1answer
41 views

State Feedback Controller

Are there any values of \$\alpha\$ for which it is possible to find a state-feedback gain for the system by bringing all closed-loop poles to zero? If your answer is affirmative, find a feedback ...
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1answer
76 views

Transfer function - get rid of zero

I have a close loop transfer function, consisting of a system and a controller (PID). For some reason does it create 2 zeroes which creates an undershoot which should not appear at all. I don't ...
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0answers
48 views

Nyquist VS Nichols plot

Which is the most commonly used: Nyquist or Nichols plot? Do they have their own particular use or is it just a matter of preference?
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2answers
215 views

Preventing relay contacts from sparking on disconnect

I am currently using an 80A automotive relay to control a motor. The relay seems to work great to control the motor, but on disconnect a visible spark can be seen through the clear relay housing. I ...
0
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1answer
99 views

Mode toggling circuit using only transistors, resistors, and capacitors?

I’m trying to build a circuit that: Does not draw power when in an idle state (when it’s not lighting up an LED). When the user momentarily presses a button, the circuit keeps an LED on for either 1 ...
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3answers
181 views

Auto detect LED failure

I'm using bunch of LEDs with red, blue and yellow colors in a product for sign indication. the product has total around 150 LEDs of all three different colors. As these LEDs are purchased in bulk, ...
0
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1answer
90 views

Calcultions to choose between a transistor (switch)

thanks in advance :). I am a little bit confused, i need to turn on a led lamp (5watts), using a light sensor from my Arduino. I was reading a lot of theory the past two days. Here is the deal: ...
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4answers
197 views

heat air with nichrome wire

108 rows of grapevines, each row 650 feet long. Suspend a nichrome enameled wire along each row in order to raise the temperature of the air within 18 inches of the wire 6 degrees Fahrenheit. What ...
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2answers
66 views

Arduino and several leds

Can an Arduino turn on multiple leds at the same time?. I want make a home made lamp with several less controlled with an Arduino UNO light sensor and i already have the light sensor, also i know how ...
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1answer
88 views

transfer function and error gain function

simulate this circuit – Schematic created using CircuitLab I know the difference between those two functions , but i want to see the relation between them , i think that the error gain ...
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4answers
322 views

Importance of keeping the electricity network frequency stable

The frequency in the electricity network is kept in balance by primary and secondary control among others (see e. g. here). I read that frequencies below 47.5 Hertz are dangerous and can lead to ...