All Questions
Tagged with electrical-engineering control-theory
42
questions
0
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37
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Closed loop motor speed algorithms
TLDR; looking for algorithms to control a motor. I have a near-random torque, a battery current that can destroy my motor driver, and I aim for a stable output speed regardless of torque. My inputs ...
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votes
0
answers
37
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Using Relay and contactless water level sensor to switch on or off motor pump
I have no prior experience related to electrical projects and I am having confusion about which type of relay and how to connect relay, contactless water level sensor and motor pump.
So basically I ...
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votes
1
answer
61
views
Error Equation of a Control Loop
I want to calculate the error of a control loop. Therefore, the system and the general processes and models are defined as follows:
The equation for error is described as follows:
I do not ...
- 13
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148
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What is the intuitive explanation for why a system can be stable with a negative gain margin?
Beyond the math which shows that a gain of -1 and a phase of -180 (G(s)=-1)causes instability when the open-loop TF is taken to closed loop, the way I've always justified the instability of G(s)=-1 ...
- 133
1
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0
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54
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Internal Stability and Small Gain Theorem
I am currently working on a MIMO feedback system and trying to determine its internal stability. The open loop gain of the system is stable and has no internal right half-plane pole-zero cancellations....
1
vote
2
answers
136
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$\mathcal H_2$ norm for LTV system
Preliminary: Consider a stable, strictly causal discrete-time LTI system with state-space model $\left[\begin{array}{c|c}
A & B\\
\hline
C & \pmb{0}
\end{array}\right]$. ...
- 21
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votes
1
answer
58
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Controlling a system in a particular direction
In Discrete-time Control Engineering by Katsuhiko Ogata, it is stated that "A necessary and sufficient condition for complete state controllability is that no cancellation occurs in the pulse ...
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43
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How to control speed of DC Gearmotor with Varying Torque
I have a system where the torque is constantly changing, but I need the speed to remain at 9RPM. I have enough room for error where I can be between 8 and 10RPM. How can I achieve this? All I can find ...
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votes
1
answer
372
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Definition of Bandwidth as angular frequency
I am searching for a Formal Definition of bandwidth given the transfer function of a system, or the bode plot.
Is it the frequency $\omega_b$ in which
$$20log|H(j\omega_b)| = -3\text{dB}$$
or
$$20log|...
- 13
1
vote
3
answers
2k
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If a control system is unstable does it mean it will oscillate?
When a plant is known to be unstable, does it mean it will have an oscillation response?
- 33
2
votes
1
answer
91
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Full state feedback of a closed loop system
Does Full state feedback gains affect the dynamic or steady state gain of a closed loop system?
- 33
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42
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Control Partitioning in presence of external disturbance force
I am simulating the dynamics of a control system that has been designed using the control partitioning technique (model-based control + servo control).
I am having a query for the case when an ...
1
vote
0
answers
22
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Find same modulus z plane poles of over damped system
I am asked to find two poles of a second order discrete over damped system that have the same magnitude (0.4, to be exact) in the Z plane. From what I understand, that is not possible since over ...
- 11
-1
votes
1
answer
70
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Temperature controller using pt-1000 sensor
I need to control the temperature of a system with high accuracy with error value of $0.1$ degrees celsius +-. I will be using temperature sensor PT-1000. I need to know what would be the best option ...
- 1
1
vote
2
answers
645
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Chemical engineering equivalancy to the spring-mass-damper/RLC circuit
I understand the equivalency between the MSD and RLC circuits. Mass ~ resistance, spring ~ inductor, damper ~ capacitor.
With the equations of the form
MSD:
$$ m\ddot{x} + c\dot{x}+ kx = F $$
...
- 331