Questions tagged [closed-loop]
The closed-loop tag has no summary.
89 questions
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Closed loop current control FOC algorithm isn't working
I am trying to implement a closed loop FOC current control algorithm. I have an absolute encoder and using a gate driver DRV8305 for driving a PMSM 8 pole pair motor. I have calculated the offset ...
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Why is time constant of PLL by rule of thumb higher than the reference period?
Why do we generally say that the time constant of a PLL (\$\tau\$) must be 10 to 5 times higher than the \$T_{\rm IN}\$ of our reference frequency?
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Looking for PMSM FOC Model for My EV Powertrain Project
I'm working on a project to create a powertrain model for an electric vehicle, and I could really use your help. My model includes a battery, inverter, a closed-loop controlled motor (PMSM), gearbox, ...
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Is there a name for this looped power combiner circuit topology?
I've encountered a circuit topology that has an interesting effect that is so simple in design that I have a hard time believing that it hasn't been studied and named previously.
Here is a basic ...
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How to handle the noise and wrong measurements due to the actuator in a close-controlled loop [closed]
My system has to inflate a rubber device using a diaphragm pump to a specified pressure (about 1000 Pa, with an ideal accuracy of ±50 Pa). The volume of the device is about 3 L.
The pump is connected ...
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How to calculate the close loop gain? Am I solving it in the right way?
The following is a question from 8.18 in Design of Analog CMOS Integrated Circuit, page 342.
Consider the circuit this following Fig, \$(\frac{W} {L})_{1-4} =\frac{50} {0.5} \$, \$|{I_D}_{1-4}| = 0.5 ...
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AND gate IC - "SN74LVC1G08DBVR" is giving a wrong output
I am working on a boost converter circuit that gets 12Volt as input (J1) and gives 18 Volts at the output (J4). I am having issues in the feedback circuit for this converter, especially with my AND ...
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Closed-loop Transfer Function [closed]
help me answer this. pls show me your solutions, that would be very helpful so i can understand how you did it.
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3600PPR NEMA 17 Stepper Motor PPR
What if any additional components would I need to make a NEMA 17 stepper motor have 3600 pulses per revolution? Do I need one or both gearboxes and encoders. My application requires fine degree ...
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Measuring Motor Speed in an analog circuit - (no digital components)
I have been searching for several resources on closed-loop analog motor control. Most of them used a tachometer for speed measurement, which makes a lot of sense because the tachometer is analog and ...
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How to determine the phase margin when the Bode plot never crosses 0 dB?
I have a graph that looks like this. I am tasked to measure the phase margin, but the graph doesn't exceed 0 dB.
The circuit is this. The input DC level is 0.6 V, which is the problem. When I change ...
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What would be the equivalent circuit of the following block diagram?
They gave me the following diagram, in the references they gave me I was able to obtain the PID block circuit, I only need the circuit of the \$\frac{1}{s-2}\$ function, It sounds like an RC circuit ...
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273
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Controller for boost converter
I'm trying to design a controller for a boost converter by the "shaping loop gain" method as in the Fundamentals of Power Electronics textbook by Ericson and Maksimovic.
I see that there is ...
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Bode phase plot phase margin
From what I have studied so far, gain margin is defined as how much additional gain the system can be given before it becomes unstable, and this can be measured from the bode magnitude plot ...
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Phase shift oscillator: what is reducing loop gain and how does changing feedback resistor affect things?
I have simulated the following circuit in LTSpice:
One can see that a stable sine wave with a peak of about 6.3 V is obtained, which has a frequency of 1 kHz (I calculated the RC network values to ...
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653
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Closed loop control of a stepper motor (i.e. servo system)
Crucial to the performance of a CNC is its ability to precisely, accurately and quickly move
to the directed position. Stepper motors are perhaps the most popular (and therefore
cheapest) motors ...
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The output of PI controller using opamp is not working [closed]
I am designing a closed loop system for dc-dc converter for that I am using error amplifier and pi controller. For error amplifier and PI controller I am using OP177A opamp. The error amplifier ...
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Define input impedance of a buck converter for ideal converter (efficiency 100%) & practical converter
What I know was -The input impedance by the closed-loop buck converter in CCM mode, Zi and, in turn, that presented impedance is dependent on Zo and the duty cycle used by the buck converter
below is ...
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981
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H-bridge class D amplfier [closed]
i am trying to make a closed-loop class D amplifier for a dissertation. I have the basics:
audio signal-->pwm modulator(LTC6992)-->gate drivers->H-bridge-->LC filter--> speaker
but i ...
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4
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1k
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Peltier quick heating and cooling
I am using a Peltier module to quickly heat and cool down the object placed on it to a particular temperature. My target is to heat the object to 90° and then cool it down to 54° and then heat it ...
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4 wires encoder to 6 wires Hibrid Servo drive for closed loop stepper motor
I have the HBS860H driver and LPD3806.I wanna know if I can connect this 4 wire encoder, to this 6 wire driver.
HBS860H:
https://hardware-cnc.nl/images/PDF/ACT/HBS86H_English_Manuel.pdf
LPD3806: (i ...
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610
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Interesting driving circuit of a voice coil actuator
I have an interesting circuit to drive the voice coil stage of an old acoustic microscope. I am struggling to understand what the different functions of the opamps in this circuit are.
The circuit ...
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589
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Confusion regarding finding closed loop transfer function and damping constant from open-loop transfer function
I have second order transfer function $$ G(s) = \frac{1.247}{s^2+9.76s+23.8}$$ G(s) is in the forward path of a unity feedback system.
How do I find the closed loop transfer function and damping ...
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unstable systems with positive phase/gain margin
Open loop Phase/Gain margins provide information on how much margin the closed loop system have until it becomes unstable. In other words, how much you can increase the effective loop gain and or ...
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439
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Bode plot in Pspice
I want to get the bode plot of the controller part of my Buck converter. For this I looked online and saw a technique that mentioned to add an AC injection source from the voltage output to the top ...
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