Questions tagged [control]
Control refers to systems that control other systems, whether that be industrial machinery, lighting, or devices used in a home.
1,236
questions
1
vote
1
answer
52
views
How to obtain the pole zero map and step response of the 2nd order system and determine the mode of damping in the system using MATLAB?
$$\frac{C(s)}{R(s)}=\frac{\omega_n^2}{s^2+2\zeta \omega_n s+\omega_n^2}$$
Obtain the pole zero map and step response of the 2nd order system and determine the mode of damping in the system. If the ...
3
votes
2
answers
158
views
Kalman filter for estimation of braking resistor temperature
Let's say I have an inverter fed three phase induction motor drive where in the braking phase (when the motor operates in a generator mode) the generated electrical power is dissipated in the braking ...
0
votes
1
answer
27
views
Solenoid valve gating and time proportional control
I'm trying to complete this simple task:
I have solenoid valves to control the humidity in an array of boxes. I use time proportional PID control to turn them on or off. I suspect I keep wearing them ...
0
votes
0
answers
29
views
How can a power converter small signal model predict transient behaviour during a load step which is a large signal disturbance?
I see small signal model being used to predict the Overshoot/Undershoot of output voltage due to a load step.
How do we justify this approach, since the basic assumption of small signal modelling is ...
0
votes
0
answers
91
views
Reference Voltage Tracking for DC-DC boost converter
I have a boost converter which works perfectly with an s-domain controller (using a type-3 compensator and dual loop). Now, I need to do this using digital control (z-domain). I have converted the s-...
0
votes
0
answers
59
views
Design a PID controller for a MG=1.5
Consider the following system:
I need to design a PID controller with a gain margin of 1.5 for the disturbance P(s).
In order to have a certain gain margin I need to find the critical gain Ku, so ...
0
votes
1
answer
45
views
Dual 4-20 mA inputs to voltage ramp
I'm trying to take dual 4-20 mA signals and use them as a heat/cool signal for a Peltier module.
I have an integrator but I'm trying to find the best way to decipher the dual signals and turn them ...
0
votes
0
answers
93
views
PCB layout/schematics of solenoid lock control - Problem - uncontrollable unlocking
I have a problem with opening solenoid locks. Sometimes, immediately upon connecting the power, and other times after about half an hour or even an hour, the locks start to open uncontrollably.
I have ...
1
vote
1
answer
79
views
How do I find my phase margin using the Bode plot?
From the Bode plot, is my phase margin correct? I estimate around +30 degree phase margin - or is it -30 degree phase margin? I am unsure about this thing.
0
votes
1
answer
73
views
Can a MOC3032M optocoupler be used to generate a DC PWM signal?
I'm trying to make a circuit that can output an 80 Hz PWM signal. I'm planning to use an Arduino to switch an optocoupler that will control the duty cycle.
Here is my circuit:
After building the ...
2
votes
1
answer
58
views
Reflow oven control technique
I am developing a DIY reflow oven using a 10L common electric oven with quartz heating elements.
Below is a graph that represents the oven's step response (open loop response):
In blue: oven's step ...
0
votes
2
answers
157
views
Zener diode as a switch
I would like to use a Zener and a NPN transistor as a voltage switch to close a 12 VDC relay. My thought was 12 V zener to the base to turn on the transistor and close the relay when supply is above ...
6
votes
1
answer
484
views
Is it wise to determine heating element temperature from resistivity?
Context
I'm making an electric furnace for melting metal, and aiming to make my own controller.
Everyone seems to just use thermocouples and a control loop, I thought perhaps I could just measure the ...
4
votes
1
answer
143
views
Can anyone point me in the right direction to solve this control systems problem?
The problem is the one at the top of the page. I was able to reduce the first block diagram into the feedback loop block and I got H(s) = 4s + 1 using the identities in the book. I've spent hours ...
1
vote
1
answer
63
views
Allowable process variation for non minimum phase plant
Scenario (plant model subject to process variations)
Consider a plant \$P(s)\$ in series with a controller \$D(s)\$ with a negative feedback path around it, where the closed loop is given by the ...
0
votes
4
answers
94
views
Connecting every other DIN terminal to each other
I am building a custom panel. My output DIN terminals are supposed to be in this order: Power, Ground, Power, Ground, Power, Ground.... I cannot find a proper way (jumpers or bars) to connect them. ...
1
vote
0
answers
44
views
Control engineering: how to design a system for desired impulse response
I've designed a system to get a desirable step response. However, I think the impulse response of my system is more important.
There are many methods for designing a system for transient response ...
0
votes
1
answer
108
views
MOSFET and Falstad
I have a circuit to control a small motor which is modelled in Falstad. See model below. when I start the simulation the voltage on the MOSFET side of the motor is low and then climbs until it reaches ...
0
votes
1
answer
64
views
Relation between controllers and compensators?
https://www.control.utoronto.ca/people/profs/kwong/ece311/2018/lecture_notes/lead_or_lag.pdf
Please check the above link especially the lines shown highlighted in attached snapshot.
So can we say that ...
0
votes
0
answers
76
views
How does a voltage controller (outer loop) set the current reference for the (inner) current loop in cascaded control of a boost-converter?
I am currently trying to understand the cascaded current-voltage control of a boost converter (and later design the PI-controller). Let me summarize the information I have collected so far:
Outer (...
1
vote
1
answer
92
views
How can I implement current control for proportional valves?
I am currently working on operating a proportional valve for airflow, but I am facing some challenges. Initially, I attempted to control it using a DRV8871 motor driver with PWM frequencies of 500 Hz, ...
1
vote
2
answers
114
views
How to reduce gain margin to finite value?
I am trying to observe bode plots for a system but i am getting infite gain margin. I know that positive phase margin and/or positive gain margin represent stable system while negative phase margin ...
3
votes
1
answer
122
views
I don't understand this temperature controller circuit's behaviour [duplicate]
I am trying to build a circuit to regulate temperature for a few microheaters. Here's the circuit I am using:
This is a constant temperature controller circuit often found in the research papers and ...
0
votes
1
answer
62
views
How to vary output current by maintaining constant output voltage? [closed]
I want to control a proportional valve by keeping its voltage constant while varying its output current. Is there any way to achieve this
0
votes
0
answers
45
views
Can an RCL circuit be asymptotically unstable? If so, what does that mean physically?
I'm analyzing the asymptotic stability of the system of ODEs that comes from an RCL circuit in series. Below is my circuit, with battery voltage \$u(t)\$, resistor with constant \$R>0\$, capacitor ...
1
vote
2
answers
95
views
Why doesn't the LED shut off?
Why doesn't the LED doesn't shut off when I set the input to 0V? The simulation does, but that's not what happens in the real circuit. I've grounded the second op amp's inputs (on a NE5532), tried ...
0
votes
0
answers
59
views
BLDC motor position control
For my project, I need to control position and speed of a BLDC motor with PID. Although there is information about the speed control of the motor, I could not find much information about the position ...
0
votes
0
answers
16
views
Rexroth Indramat CLM 1.3, how to execute command
I have to execute the command:
CLA Clear Axis (Absolute Encoder Value)
E 0170 CLA
2
To be honest I don't know how the CLM works ...
0
votes
0
answers
73
views
For the equation below, how would I calculate the gain required for a settling time of 1 s?
The equation is:
\$G=\dfrac{k(s+4)}{(s+1)(s^2+6s+13)}\$
How would I calculate the gain (k) required for a settling time of 1 s?
By using \$ts=\dfrac{4}{(ωζk)}\$ the closest value I got was ...
0
votes
1
answer
58
views
Understanding Signals, LTIs and Electrical Circuits [closed]
I am an Electrical Engineering student; and recently read through subjects like "Signals and System" and "Control Theory". The flow on concepts amidst these two subjects was ...
0
votes
1
answer
43
views
Control manipulator mechanical arm by infrared
I want to make an infrared control circuit (remote) connected to the Manipulator Mechanical Arm. I found this circuit, but the outlet is 230 volts, and I do not think that the arm will handle this ...
0
votes
2
answers
88
views
Step response v/s DC voltage
I have to find step response for this circuit considering my input as Vo and step for Vin( I am using Simulink for this)
Firstly what i did was making this circuit (DC voltage is 1V)
The response on ...
1
vote
1
answer
70
views
How does deceleration work on a servo drive?
I'm confused by the fact that PLCopen MC-blocks used to control servo drives from a PLC have separate acceleration and deceleration parameter. For instance, MC_MoveAbsolute.
I don't understand what ...
0
votes
0
answers
63
views
ESP32 Stepper Motor Control PCB Design Validation
I am presently in the process of developing a PCB designed to act as a foundational board for the precise control of a stepper motor. The system incorporates an LCD display and various sensors for ...
0
votes
0
answers
61
views
Traction characteristic of the three phase induction motor
I have found a datasheet for a three phase induction motor intended for the traction applications. Among other information there was a below given traction characteristic
. Unfortunately I am not able ...
0
votes
0
answers
35
views
Programmable Controller for Sensorless BLDC Motor
I'm trying to find a programmable controller (or system for controlling) a sensorless BLDC motor - 24V, 20A. I want to control speed, fwd/rev, and dwell time in certain positions. Apologies if this ...
0
votes
2
answers
62
views
How I can use light to control of amplifier?
I want to make a car that I can control by light, and I thought of using a photoresistor and a light sensor to control the amplifier to make it perform two functions.
The first function is to make the ...
0
votes
2
answers
49
views
Confusion regarding formula of positive feedback
Please check the attached snap especially the yellow highlighted "plus" sign . According to my understanding it should be "negative" because it is case of positve feedback as shown ...
0
votes
2
answers
67
views
Implementing feedforward control in heated box
I'm making a temperature-controlled box. Issue I'm having is that it overshoots and undershoots a lot because it takes a long time between turning the heater on/off and seeing a difference in ...
1
vote
1
answer
46
views
Does "Torque control" using FOC consider input (battery) voltage drop?
All information related to Torque Control using FOC technique consider a current control, so they suppose a correlation between req_Id (Id desired) and requested mechanical torque. PI regulators ...
-1
votes
4
answers
168
views
What is wrong with this circuit?
This is a circuit of a vehicle ECU. It should turn on the ECU but there are some mistakes and the ECU won't turn on but I can't figure it out:
1
vote
1
answer
45
views
Spice Software Supports Parameterizing Sub Circuits?
I have Multisim and I can't figure out how to add value fields to my sub circuits or hierarchical blocks.
Let's say I'm making a sub circuit that is simply a voltage divider... so I have two resistors ...
2
votes
0
answers
86
views
Damping gets better, but overshoot increases. How can I explain it?
I have three transfer functions as below
The pole-zero plot and the step response of the transfer functions are given as
It makes sense to me that G3 has a better damping than G2 and G2 has a better ...
4
votes
2
answers
1k
views
Why 2 thermostats of different rating in series in heater circuit?
I am trying to repair a small water distiller. The machine is fairly simple, heater boils water, the vapor is cooled by a fan and the water is collected.
More information: How to use
Connect power ...
0
votes
0
answers
57
views
Buck Converter Output Voltage Swing problem
I am designing a voltage mode control buck converter and I have an issue with my output voltage swing. I made calculations for type 2 compansator. I can't figure the cause of problem is stability of ...
1
vote
2
answers
79
views
How do I best protect a PLC and power supplies from voltage and current spikes coming from actuated components?
Problem
My PLC is getting voltage spikes in the onboard ADC readings when I turn on actuated components elsewhere in my electrical system. I need to protect my PLC from these spikes because they ...
2
votes
0
answers
37
views
How can I explain contradictory damping performance between linear and nonlinear systems?
I have a 3rd order nonlinear dynamical system, representing a power system. After linearizing the system, it turns out that by increasing the parameter L_g, damping is reduced and thus the overshoot ...
0
votes
0
answers
27
views
Understanding the effect of HPF on the amplitude and phase control in STM32
I am using a STM32 to control amplitude and phase of a signal when passed through a RC circuit(LPF) which later will be replaced with a tip tilt mirror.
I have a STM32 which has the code implemented. (...
0
votes
0
answers
38
views
Nyquist Plot Stability with Angle
I don't understand the solution done here. The Nyquist criteria I know is Z=N+P and I don't see the relation with this solution. Where do the angles come from?
1
vote
2
answers
84
views
Peltier linearity and equalizing control of heating and cooling directions
I need to change between heating and cooling with a Peltier, controlling this with PID.
I've read a ton of information on Peltiers, looked at their datasheets and despite of this, I still cannot ...