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

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Loop bandwidth for ADPLL

Can anyone explain to me how to obtain the loop bandwidth for the second order all digital PLL. If I have a second order transfer function the loop bandwidth is defined as W3dB bandwidth but for all ...
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23 views

Distribution of Control in Modern Electrical Grid SCADA Systems [closed]

I have a few questions regarding the structure of modern SCADA systems, in the context of the electrical grid. Specifically, what controls the state (either open or closed) of circuit breakers on ...
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3answers
57 views

Using PLC for more over than 200 relays application?

Hi im currently building an application to control over 200 device in a building. Originally i want to use an arduino and bunch of relays to control them. After asking some questions and such in this ...
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1answer
36 views

Is a Variable Frequency Drive (VFD) a Secondary Element or Final Control Element (FCE) in a control system? [closed]

I'm confused with some concepts about instrumentation in a control system. I'll use a Variable Frequency Drive (VFD; PowerFlex 70) to control a pump to change the process fluid level. It's clear in ...
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1answer
35 views

Direction and Speed control using same throttle

I have a 24VDC permanent magnet motor such as those commonly found on a mobility scooter. I would like to be able to control both the speed and the direction of the motor with the same throttle ...
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2answers
51 views

digitaly controlled voltage divider for picky audio recording enthousiasts

I want to replace expansive multi-deck rotary switches with a micro-controller and digitally controlled (i2C or ISP) analog switches. It will be used in a vintage (1972) discreet transistor ...
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45 views

How to learn Control systems? [closed]

I have been astonished by Control theory and, its applications like the inverted pendulum, and the various control projects that use gyroscopic effect for stabilization, and i am avidly trying to ...
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1answer
25 views

How to find system overshoot (Mp) from Bode diagram

In some questions (in linear control theory) it is desired to design a controller to change the system overshoot (Mp), my question is: Is it possible to find Mp or damping factor directly from ...
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1answer
34 views

What's the point of vector control for ac machines?

for what I understood vector control controls the rotor's flux and the torque (both in magnitude) by changing the stator currents in the qd0 reference frame. let's say we are dealing with direct ...
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1answer
38 views

why do I need a pwm and H bridge, after a PID controller to feed a dc motor?

let's focus on current control. here's how I understood how the control works: (picture below) Basically I feed my PID with a reference current minus the measured current (i.e. I have a negative ...
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1answer
40 views

Control Engineering - Root Locus

Please see attached Question & Answer screenshot. I have managed to answer up to part 4 of the questions however in part 5, after countless working out and re-evaluating my approach, I still can't ...
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2answers
63 views

Wiring up the SRD-05VDC-SL-C to an Arduino or Arduino-like microcontroller

I'm trying to wire up the SRD-05VDC-SL-C mechanical relay to a Particle Photon and/or Arduino (not the version that is on a breadboard), and am a bit confused by the datasheet. I device I am ...
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38 views

Routh-Array (Control Engineering)

Please see attached slide for a Routh-Array. I'm struggling to see why the encircled element is 4. Rather, according to my calculations it is 0 as the determinant will give zero. Unless I'm doing ...
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1answer
31 views

Effects of using a different PWM frequency than specified on device

I am wiring up a fan speed control circuit that creates a PWM frequency that is used by a PWM fan (the fan and its specs are pictured below). The fan claims that its PWM control is done through a ...
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1answer
125 views

RF Transmitter and Receiver circuit controls

I'm trying to build a Radio controlled TX and RX circuit (using a 2.4 GHz chip and MCUs), to control a robot with four DC geared motors. I plan to use four momentary on-off-on switches on the TX ...
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3answers
56 views

PID Control: Controller of the type \$\dfrac{1}{s+k}\$

In PID control an integrator action is represented by \$\dfrac{1}{s}\$ Does anyone know what would be the effect of using \$\dfrac{1}{s+k}\$ instead of \$\dfrac{1}{s}\$, where \$k\$ is a constant? ...
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1answer
75 views

The process of implementing a discrete model in C++/Arduino

I have developed an embedded electronics system centered around the Arduino Due. In my application, I am controlling the force of the end effector of a rigid object using a DC motor. The feedback ...
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4answers
119 views

Motor control using potentiometer characteristics

I am trying to control a dc motor using potentiometer(armature control). Increase in voltage leads to increase in speed of motor. Even though this seems in accordance with general understanding, but i ...
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10 views

Simulink doesn't show all PID's for Control System Designer

I have a script in Simulink of a control system with two PID's. When I try to analyze it in "Analysis->Control System Designer" and I click on "Select Blocks" only one of the PID's appear. Does ...
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2answers
122 views

Hooking two (gasoline) generators together to make 220VAC

A question was posed on the Home Improvement SE... Can I buy or make an adapter to hook 2 generators together to run a 220 volt welder? Any contribution to this thread (from an electrical engineer) ...
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1answer
74 views

TIP120 Vs. a Big Battery

I have a big battery (11.1V, 10c, 1300mAh), a load of about 0.319 Ohms, and a TIP120 transistor. Now I've heard about the wonders of the TIP120 before (and complaints too) on various Arduino forums. I'...
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1answer
42 views

Wireless control of switches

This is slightly modified diagram of original one for control of DC motor using relays I got in this community. I added flyback diodes and battery for relay coils: My question is, is it possible to ...
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56 views

Buck converter control

I'm using a buck converter to power a resistive load, the requeriment I've is to increase the current progressively, to do this I'm using a uC. Converter specifications are: Input voltage: 28V ...
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1answer
72 views

Discretization Using ZOH, FOH and Tustis bilinear Transformation

I am very new to this forum, so excuse me if i do not write the equations properly. And I'm pretty new to DSP too, so this might be very basics for most of you, but it's pretty complicated to me. I ...
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4answers
34 views

Choosing accelerometer or displacement sensor for system

I am working on an electro-servo motor system which can be seen as a similar in here! It is a shaketable system which converts acceleration input to displacement output. My question involves a bit ...
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3answers
81 views

interchangeable operation of two electric motors without PLC

I have two motors that drive an air compressor. I have a pressure switch to turn the motors on/off. The sequence I want is: when pressure switch turns ON - motor 1 starts, when pressure switch ...
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1answer
60 views

Using Stepper Motor like Hobbyist Servo [closed]

I want to use a stepper motor in place of a hobbyist servo that I am currently using to actuate a throttle. The motor is to turn from 0 to 90 and modulate engine speed between these two positions ...
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1answer
44 views

if i have a pole in (0,0i), is the system stable for k=0?

KGH(s)=k/s(s^2+4s+7) Is my system stable for k=0 ? If i have a pole in 0,0i does it automatic says that my system is not stable
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1answer
40 views

Making a plant stable with a compensator based on given requirements

I have a transfer function of the plant modeled as the following: I'm trying to design a compensator that satisfies some requirements. a. The maximum control bandwidth (0 dB crossover frequency) ...
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1answer
43 views

PI compensator question

I have a RLC circuit to discover the characteristics of controlled system. The block diagram has shown below where If I add a PI compensator to the closed loop system, Q(s)=1/s,and the transfer ...
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2answers
57 views

How can I invert this current control?

Below circuit is an emitter follower supplying current to an LED. A DAQ board is outputting 0-10VDC voltage to the base and cannot supply more than 5mA. Thats why the LED is not directly hoked up to ...
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2answers
54 views

if i give an input signal in Volt unit to a PI control what will be the units of the output? [closed]

if i give an input signal in Volt unit to a PI control what will be the units of the output?
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4answers
180 views

How do I get a position from an encoder?

I have a motor that drives a rail which I need to know the position of. I have an AM102 encoder attached to the motor. But am unsure how to get a position from it. I have powered it up and attached ...
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40 views

help with multivariable control loop

I am looking to find the transfer function from w to z in this loop. I have been trying for a while looking all the relationships but just don't know how to express w in terms of r,d and n and then ...
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40 views

Discrete disturbance observer

I am an autodidact in digital control and I have been solving following problem. I would like to construct a digital state observer combined with disturbance observer and I am not able to find ...
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2answers
85 views

PWM driven power supply [closed]

As you have asked me, I will explain in better words my problem. I'm working on real-time bench. I have an algorithm on my laptop and I interact with hardware through a calculator supporting real-time ...
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2answers
82 views

How to analyitically optimize an RLC “circuit” to reduce overshoot?

I have a "circuit," that's not really an electrical circuit but rather a physical process that follows the same functional form as an RLC circuit with regards to how it responds to excitations--...
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93 views

Is PWM or voltage control the most efficient way to control a heating element? [closed]

I am thinking about a heating controller for my electrically heated motorcycle coat. It draws about 6 amps at 14V on my motorcycle. My question is whether it is more efficient to drive a heating ...
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1answer
100 views

IIR filter concerns in PID control systems

The following diagram represents the system: Here comes some more description: The system input (ref or reference is zero). And actually the goal of the controller is to maintain the output of the ...
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1answer
43 views

Heat exchanger identification

I have been developing a digital controller for water cooling system of power electronics converter. This system consists of plate heat exchanger, pipe with demineralized water flow (this fluid is ...
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1answer
46 views

Which method of controlling speaker volume consumes more power? [closed]

2 speakers are playing at same volume from computer. One speaker volume is controlled by software but knob turned to maximum. Another speaker has volume knob set at 75%. Both are playing at same ...
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3answers
82 views

Is there a way of powering an incandescent light bulb without AC mains?

I'm looking to power a light bulb for a greenhouse project, but I do not have the option of using the AC mains (for safety reasons). Is there a way to power it on using a lower voltage? I have a solid ...
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1answer
68 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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4answers
237 views

How to control the driving frequency when working with high power ultrasonic transducers

I would like to know the simplest solution to dynamically tune the driving frequency of an ultrasonic transducer to its resonance frequency. My amplifier has a power meter that I can read an optimize ...
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2answers
88 views

What is trimmable “peaking”?

I'm studying Jim Williams application note AN-104 - Load Transient Response Testing for Voltage Regulators, in which he describes an FET-based load transient generator, what might commonly be called ...
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1answer
105 views

Need Circuit advise to drive high current loads

I need Some advise on the circuit I plan on building. This circuit is to run any high current (Max. 100amps) device in my car. I want to use a high side mosfet to supply power to any field device. An ...
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2answers
69 views

What causes “positive feedback” in audio amplifier

I am currently using an audio amplifier to make a presentation. However, sometimes mid presentation the audio amplifier will go into a "positive feedback" mode where the sound coming out of the ...
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0answers
35 views

Digital state space compensator based on current state observer

I have been solving following problem. I have a continuous system with following state space equations $$\left[\begin{matrix} \dot{x}_1 \\ \dot{x}_2 \end{matrix}\right] = \left[\begin{matrix}0 & 1 ...
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1answer
36 views

In root locus technique, which branch emerging from the open loop poles goes up and which goes down?

I've recently started to study the root locus concept and I have got this question about the branches. Please refer to this problem here in the link: http://lpsa.swarthmore.edu/Root_Locus/Example2/...
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2answers
126 views

Making a two speed motor - TRIAC and PWM question

I would like to create a dual speed blower which goes into HI when an SSR from a PID is activated. I would like to be able to control the speed of each of the high and low settings. When the SSR is ...