Questions tagged [control]

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

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Question on showing function in a control system block

I am trying to add a function to a control system diagram. I have a constant F being fed back into the diagram but it depends on a signal 'v'. In equations I directly used a signum function but for ...
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What are the effects of removing P, I, and D from a PID controller respectively?

A proportional, integral, and derivative (PID) controller can feature three terms.) We sometimes see only two of the terms in use. For example, the derivative is disregarded for a PI controller. While ...
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Nyquist plot mirrored across imaginary axis

I am reading Foundations of Oscillator Design by Guillermo Gonzales. When an amplifier is connected in a positive feedback configuration, the transfer function is \$A_{vf}(s)=\frac{A_v(s)}{1-\beta (s)...
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Voltage is below 380

I am Vango from Ethiopia. Am junior electrical engineer. While working today I've faced some problem. That is when incoming voltage drops below 380 V, I mean when it is about 370 V, motor stops ...
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How to connect a bistable valve?

I need to control a bi-stable valve: Here is the typical wiring provided for such 3 wires type valve: But I don't want to continue to feed it when actually closed or opened which is normaly ...
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Why I am seeing 120 ohms resistance in obd connector Pin6 amd Pin16 and at ABS connector resistance between can+ and can- shows 60 ohms. Why?

I am seeing a resistance of 120 ohms between CAN high and CAN low at the OBD Connector between pin 6 and pin 14. I also checked the can bus resistance at the ABS/ESP module connector and it shows 60 ...
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BLDC Hall Sensor Angle Offset

I'm running a BLDC motor and I'm working on my own Software. I want to run the BLDC Motor with field oriented control, that's why I need a precise electrical angle. I'm using three hall sensors in the ...
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Lyapunov Theory to Prove that a Controller minimize the Control Energy or Actuation

Hello Control Engineers! I am currently trying to prove that certain controller actually tried to minimize the control actuation or energy, like utilizes less battery as compared to the classical ...
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TEC cold side temperature decreases, then increases rapidly [closed]

first post to this stack exchange. Self teaching on TEC circuits. I bought a diymore TEC1-12706 12V 60W 6A. Note no heat sink installed on the TEC. To test the TEC I put together a series circuit as ...
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Kiln SSR zero-cross frequency

I am planning on using a WATLOW DC2T-24C0-0000 power controller for a three phase electric kiln. It is a zero-cross 3 phase, 2 leg controlled contactor capable of driving 46 amps with its huge heat ...
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Contradictory relationship between quality factor and damping

I am studying control theory and mechanical vibrations. From control theory aspect, I know that bandwidth and response time is inversely proportional, which means bandwidth and damping as well. The ...
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Time optimum controller

I have a question regarding time optimization that I would be very grateful if you could guide me on it. The question is moving a car/mass with nonlinear forces acting on it from point A to point B ...
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FIR filter implementation porblem

I want to know how( z^-1) delay unit can be implemented in digital circuits or how can be implemented in VLSI system using("VHDL")
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162 views

Larger phase margin means less overshoot?

Why is it that the larger phase margin means the system has less overshoot? I have heard that the larger phase margin means greater damping, but I don't how they are connected to each other. Could ...
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How does the most effective circuit control multiple contacts with a rotary switch?

I will create an electrical circuit to turn on the LCD in 2 ways, namely through the microcontroller and through the header pin. If I rotate the rotary switch to the left then all LCD pins are ...
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How should I go about overriding or switching between an internal control voltage source when an external source gets connected?

For example, I'm using a potentiometer to modulate an internally generated +5v audio signal, and I'm sending the output signal down to the next part of my circuit. If I were to add an external input ...
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Problem when trying to re-create dynamic system Simulink model from .m model

I'm trying to convert the pendulum on cart's dynamic model that's described in this Youtube tutorial: Inverted Pendulum on a Cart [Control Bootcamp] into Simulink to develop some control algorithms. ...
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About choosing the right point to be the cutoff frequency

If there are multiple points across 0dB in the open loop transfer function bode plot, which one should I take as the cutoff frequency to calculate the phase margin? In Matlab, it seems that the last ...
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Why are they called delayed integrators

I'm quite confused as to why we call a system with transfer function $$\frac{1}{s+\alpha}$$ a delayed integrator. It does not seem to be an integrator in the first place since it convolves with an ...
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Confusion about the estimated phase angle in SRF-PLL

I am working on a simple PLL Simulink model as a proof of concept: I have two problems that are causing confusion for me at the moment: What should the estimated phase angle look like? Mine is like ...
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Strange result in modelling magnetic levitation system?? Negative Transfer function?

I'm working on this magnetic levitation system project where I basically levitate an object under an electromagnet using an Arduino. Currently, I'm stuck at the graphical simulation of my transfer ...
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Difficulties in modelling magnetic levitation system?

I am currently working on and writing a project (not homework) surrounding magnetic levitation with an electromagnet having to levitate an object underneath itself. I have taken a look at relevant ...
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How do I mathematically model a magnetic levitation system?

I am working on a magnetic levitation system project using PID control, and I am getting confused as to how I am supposed to mathematically model this system for my paper. Where am I supposed to start?...
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Input pole to second order system generates forced response

Could someone explain to me in more detail what they mean in the highlighted line: [control systems engineering by Nise] What is the constant forced response here referring to? In this case, the ...
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Cycle between two AC output signals using a DC source

I am doing a project that requires me to have a small compact system using a DC power battery source, but I also require it to switch between two frequency signals, such that the LEDs stay in one for ...
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System transfer function is defined with zero initial conditions - how does it have a natural response?

This shows that a system transfer function assumes zero initial conditions. By the definition of the natural response - I know that it is due to initial conditions of the system. So, how can the ...
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2 votes
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Circuit to Disable 24VDC to Load via +24VDC Logic Output

I have a load that is powered by a +24VDC source. The load can draw a max of 400mA. I would like a simple and effective circuit to disable power when a 0-24VDC logic signal is high; in addition, I ...
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Multiple questions about magnetic levitation including modelling and how to achieve it

I have several questions regarding magnetic levitation. If I have missed something in one of these questions then please do let me know. I am working on a magnetic levitation project using an Arduino ...
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3 votes
2 answers
319 views

Frequency Response of Ideal and Real Type III Compensator

I'm trying to develop a Buck Converter with a Voltage-Mode Control, using a Type III Compensator, just like the one below. So I calculated its transfer function, and then with the correct values of ...
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1 vote
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State Space Representation for Initial Conditions

I am trying to design a system in which a capacitor's current discharge into an inductor is controlled by a MOSFET. I am trying to use a closed-loop control system to control the MOSFET's Vgs, and ...
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2 votes
1 answer
60 views

What are the special cases when it might be a good idea to split the GND plane?

Splitting the GND plane is a terrible idea for nearly any circuit, but there are exceptions. Let me come up with one example I think that is an exception, a motor controller. In a motor control ...
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2 votes
1 answer
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Controlling a 24V solenoid with a 5V signal

I have a 24V drawstop solenoid that is for pipe organs to push and pull the organ registers, allowing for airflow through different pipes. The solenoid has two active low control pins, one for pulling ...
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Combining cascaded State Space models with Common inputs?

I am trying to work out how the following paper has formed its "Complete state space model" for the inverter equation (37): Paper: State space modeling of inverter based microgrids ...
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4 votes
1 answer
124 views

Motor torque control with PWM : how to measure current?

For my caving robot project, I have 8 motors for which I need torque control (they will mainly be stalled or nearly stalled.) Each motor is driven by a DRV8801PWPR H-bridge (commanded by one digital ...
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2 votes
1 answer
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Perturbation and linearization for boost converter

I'm developing a boost converter (runs with DCM, and has \$n\$ turns ratio transformer) for uni which controls the input voltage with a constant output voltage. I'm at loss on how to get the transfer ...
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1 vote
0 answers
84 views

Low-side current sensing for FOC (synchronisation)

I am working on the implementation of an FOC controller for a BLDC motor and I am confused about the synchronisation I should perform between ADCs and PWM. The setup implements 3 leg low-side ...
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1 answer
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The PID's initial position seems to be ignored everywhere. Why?

On Wikipedia, you will find this definition of the PID (position form) $$u(t)=K_p\:e(t) + K_i\int_{0}^{t} e(\tau)\:d\tau + K_d\:\frac{d}{dt}e(t)$$ In the same article, when you learn about the ...
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1 vote
2 answers
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Effects of backdriving a motor

If you backdrive a motor do you risk damaging the H bridge it is attached to? What considerations must be made if the motor has current running through it? I will be using a PWM circuit to control an ...
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1 vote
0 answers
51 views

Tuning controllers in dual-loop control with feed-forward and decoupling signals

What would be the best step-by-step approach to tune PI controllers in a dual-loop control with decoupling and feed-forward signals? I am trying to tune both the voltage and current controller in DSP ...
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0 votes
1 answer
61 views

Flyback primary side control

I read the LT3573's datasheet, I have some questions would like to ask. Based on this block diagram, 1.) What's the main function of the below circuit (red circle). 2.) If I need to detect the output ...
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2 votes
0 answers
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Control system with one setpoint, one process variable, and two outputs?

I asked a version of this question before and got some unhelpful answers, I think because 1) the minutiae of my question distracted from the core concept, and 2) I didn't adequately describe the ...
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1 answer
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How to design PI controllers for two cascaded control loops?

Let's say I have following cascaded control loops: inner current control loop with bandwidth \$\omega_{bw_{1}}\$ (PI controller \$R_{i_{s_{d}}}\$) outer flux control loop with bandwidth \$\omega_{bw_{...
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1 vote
1 answer
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TPS9264x Synchronous Buck Controllers for Precision Dimming LED Drivers

I have some questions about TI's TPS92641. Please see below: 1.) Does anybody know the principle of Chopper OTA? there are no too much information in the datasheet. 2.) What's Quasi-hysteretic ...
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  • 349
0 votes
2 answers
56 views

Can a servo be controlled (requiring other circuitry) by two binary input pins?

I am working on a project where I would like to control the position of a servo without a normal input, e.g potentiometer. The servo would be constantly powered on the red wire as required, and then I ...
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Invented logic switch to supply power to DC/DC

I have a controller where by the GPIO's pins when ACTIVATED is pulled low. simulate this circuit – Schematic created using CircuitLab I want to use transistors and FETs in such a way that when ...
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1 vote
1 answer
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Single-loop (PID) vs Dual-loop (i.e P-PI) servo position controllers difference?

I am wondering why the servo position loops are mostly dual-loop consisting of position and velocity loops while the position can be controller by using only the position PID controller. I am aware ...
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0 answers
60 views

How to implement a Control System when I have two parameters that control said system?

I've got a system that uses two parameters, let's call them F and P, to control the mass flow rate of a substance flowing into a chamber. I need to control the concentration (grams per cubic meter) of ...
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1 vote
0 answers
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How to design PI controller for the field weakening control of the three phase induction motor?

In the book called Electric Motor Control in the Chapter 8 I have found following field weakening strategy for the three phase induction motor The aforementioned field weakening strategy is based on ...
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10 votes
1 answer
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What is meaning of "classic" control in context of EE?

As electrical engineers, we often come across the terms "classic control" & "modern control" What does classic mean here? Is it meaning "old" or of "past time&...
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1 answer
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Are comparators essential in a negative feedback model, cybernetic system?

Since there are no cybernetics.stackexchange, I thought it would be meaningful to ask this to people who would possibly understand systems theory and cybernetics. Can there be a system, a negative ...
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