The control tag has no wiki summary.
0
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0answers
35 views
0-5V 1A Dual Output DC Power Supply - SOFTWARE CONTROLLED
I am interested in purchasing (or building but preferably purchase) a software controlled DC power supply. Preferably, would like to control the output using LabVIEW.
I need two separate outputs ...
3
votes
3answers
104 views
Does the frequency of a PWM signal have to be constant for a DC motor/fan speed control?
All PWM control systems I have seen for DC motor/fan speed control used a constant frequency. Is this really necessary in all cases?
How would the motor current have to be calculated for a PWM ...
2
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2answers
101 views
Using a transistor to add to max current output from a opamp?
I thought I understood transistors but now I'm confused again.
I have a basic opamp circuit to amplify the input of a electret microphone. The output of the opamp will vary within 1-4V. Now I want ...
3
votes
3answers
88 views
DC Fan Control (Switching on/off)
I'm using an MC25060V2 fan, and I'd like to switch it on and off through software occasionally (i.e. not PWM or anything fancy like that). My thought is to either put an NPN BJT or a N-channel MOSFET ...
2
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0answers
38 views
Pump control - Uni or Bi polar stepper motor
I am working on a robot that includes several annular gear pumps. We are using the MZR 2521,
manual: (please see section 5.5)
http://www.micropump.com/support_documents/manual_mzr-xx21.pdf
product ...
0
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1answer
47 views
What's the difference between delayed branch and branch prediction?
I'm studying how delayed branch works and I'm trying to distinguish delayed branch from branch prediction. What is the difference? Is delayed branch a means to facilitate a control hazard?
1
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1answer
131 views
Speed control for high power DC brushed motor
I am going to drive and bi-directionally control the speed of some 12V/24V, 100W to 300W DC brushed motors.
I have some experience in controlling small DC motors (6V/9V/12V, 0.5A to 2A) with PWM ...
5
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5answers
277 views
Stability problem in unity-gain opAmp
As a part of a controlled power supply for hardware-in-loop testing for a student driven project, I had to develop a current buffer (voltage follower) which could source up to 1 A.
I had the (bad) ...
1
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2answers
122 views
Transfer Function Of Multiple Feedback Filter
Can someone please give me tips on how I could prove that the transfer function of the multiple feedback filter below is
\$
T(s) = \dfrac{ -\dfrac{1}{R_1 R_2 C_1 C_2 } } {s^2 + s\dfrac{1}{C_1} ...
0
votes
3answers
84 views
Switching / dimming a high power mains heater
I need to make an adjustable power controller for a 3kW heater that will run off single-phase 240V AC power.
How should it be done?
Maybe a triac circuit similar to that used for dimming lights. ...
2
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0answers
137 views
How do I convert this analog PID to a digital one?
I want to transform a type III analog PID into a discrete-time one so I can implement it on a PIC18F. The controller is for a buck converter.
When I apply the bilinear transformation to the analog ...
0
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1answer
65 views
Programmable Encoder, variable numbers of pulse/revolution!
Programmable Encoder, variable numbers of pulse/revolution!
Hey everyone. I'm doing my final course work and I have a problem with an encoder. Well schematically I have to feedback a frequency ...
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5answers
316 views
how to automatically reverse the direction of a stopped gear motor and restart 12 hours later
The reversible gear motor needs to turn on @ 6:00 am pull a object 12 inches and shut off. Twelve hours later the gear motor needs to turn on and reverse the direction and place the object back in ...
3
votes
3answers
119 views
How to syncronize two motors with one pot?
I am trying to synchronize two dc motors with their own controllers. The controllers are name brand and use a 10k pot to control the speed. I have a duel 10k pot and would like to be able to "trim" ...
1
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1answer
162 views
Embedded system engineer's guide to GUI [closed]
For an engineer who solely knows C/C++ for programming microcontrollers, and has no idea about developing fancy GUI application for communication with his embedded systems, Which book and IDE might be ...
5
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0answers
122 views
How to use SCPI on HP33120A via RS232?
I have old Hewlet Packard 33120A function generator (it should be the same type as Agilent 33120A) and I would like to control it with MCU (ATMega). The generator has RS232 and use SCPI commands.
I ...
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votes
2answers
48 views
control transformer
In control transformer ,used in Switchgear i.e. 415V/240V—this transformer is single phase transformer or 2-phase transformer?
As primary is 415 V which is tapped from 2 phase….while secondary is ...
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3answers
465 views
How do you run a 5v MCU circuit on a 12v car battery?
My Archery club has asked me to design and build a Traffic Light system for shooting, but they want it to run on a 12v car battery as this is what our previous system ran on.
I'm going to make the ...
-1
votes
3answers
131 views
Variable liquid flow rate control
I'm not an Engineer by trade, rather a programmer looking to put together a micro controller project that alters the water flow rate of a cooling system to maintain a specific operating temperature ...
1
vote
2answers
93 views
DSP for single-precision control signal generation
At present I am frustrated by the limitations of fixed-point arithmetic on a microcontroller for a quadrotor aircraft. The aircraft I am experimenting with is using an ATMEGA. I got to thinking, would ...
1
vote
2answers
194 views
Controlling an electrical motor with my laptop
I want to control an electrical motor with my laptop, I want to start with the following:
a mini server connected through WiFi to my laptop
I want to connect an electrical engine to this mini server
...
0
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0answers
91 views
Working of ac servo drive in position control mode and algos for position control
I have started working with a Panasonic AC servo drive of capacity 400W (manual). While trying to understand how a ac servo works in position control mode. After experimenting I have come to the ...
1
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1answer
77 views
Set Kd too high
In a control system, why when I set Kd (differentiate) too high then it has a buzzling sound? Is it because of the system is moving up and down very fast?
1
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0answers
52 views
Are descriptor systems necessarily non-minimal?
I am working with model order reduction for electrical circuits. I am looking to implement Balanced Truncation as a form of model reduction.
The systems I work with are definitely stable, but not ...
1
vote
1answer
231 views
How can I model this linear power system in MATLAB?
For my power system, let us suppose it has the following dynamic model: \$\ x ' = f(x,u)\$.
This dynamic model consists of four first order differential equations (see below).
Then, I linearized ...
4
votes
4answers
253 views
PID regulator steady state error problem
I'm working with a PI controller that regulates temperature through a pwm duty cycle.
It generally controls well. However, the system requires a certain minimum duty cycle to balance the heat loss. ...
3
votes
1answer
200 views
Choosing relay to operate water pump
Based on my research so far, I've concluded that a relatively low-cost, yet reasonably reliable way to control operation (on/off) a motorized water pump, is a well spec'd EM-relay with flyback diode. ...
1
vote
1answer
191 views
Differences between Linear and Non Linear WECS models
I'm modelling a wind turbine and PMSG with uncontrolled rectifier and buck converter. I am currently trying to design a current controller for the current Iq coming from the generator. To do so, i ...
2
votes
1answer
156 views
What is the mathematical relationship between MOSFET switching frequency (motor speed control) and motor speed in rpm?
What is the mathematical relationship between the switching frequency of MOSFET in a three phase motor controller (induction motor and BLDC motor) and the speed in rpm of the motor shaft?
3
votes
1answer
343 views
How to stabilize this control system?
I have a control problem with saturation. It is nearly linear in the non-saturation zone.
Problem:
Occasionally I measure huge error spikes. They must not disturb my control routine.
I want to get ...
0
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0answers
190 views
Settling time and overshoot
I have the next transfer function:
$$H(s)=\frac{P(s)}{1+C(s)P(s)}$$
where $$P(s)=\frac{20}{(s^2-2s+9)(s+100)}$$
$$ C(s)=m(s+40)$$
Now I want to find the settling time and overshoot of \$H(s)\$ as ...
0
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1answer
154 views
Closed loop plant-control system
I have the next system, and I want to find the transfer function from d to y.
So I've got the next equations
v = Ce = C(r-y)
e = r - y
u = d + v
y = Pu = Pd + PCr - PCy
Now I know that:
\$e/r ...
1
vote
1answer
217 views
MOSFET relay connections to control a 3V motor
I need to turn a 1A, 3V motor on and off with a touch switch. I bought Omron 653-G3VM-61-AR and quickly smoked it. I had the battery + connected thru a 300 Ohm resistor to the touch switch (to get ...
2
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2answers
248 views
Motor Soft Starter
I am demonstrating a soft-starter for a technical report, and I am having trouble finding the correct motor and power source.
I want to use SCRs in a reverse-parallel configuration to limit the ...
0
votes
3answers
618 views
Can a motor driver for 5V be used for a 24V motor?
I’m controlling a 5V motor with Arduino but need more torque which means a more powerful motor. Here is my scheme. (I took it form a tutorial):
Here Arduino is controlling a 5V unipolar stepper ...
0
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2answers
116 views
What type of electric motor drive can be used for keeping a load at specific heights? [closed]
We are planning to adjust the level of a load (around 50 kg) by using an electrical motor. Now we are using a hand crank and we want to get rid of this manual process.
For example we want to ...
1
vote
2answers
244 views
What potentiometer should I choose?
I want to create a sound amplifier with the LM386 and I need a potentiometer. I don't have a clue what I'm doing (:P) but I've printed out the datasheet (for the LM386) and had a look at it.
So I ...
0
votes
1answer
270 views
Using Matlab to draw a step response graph
I've got the next transfer function:
$$ \frac{\hat{\alpha}}{\hat{\alpha_{ref}}} =\frac{w_n^2}{s^2+2w_n \xi s+ w_n^2} $$
Now I want to draw a step response input at height of \$\alpha_{ref}\$, where ...
1
vote
1answer
98 views
I want to find \$\frac{\hat{\theta}}{\hat{T}}\$
I have the next block diagram, and I want to find the transfer function \$\frac{\hat{\theta}}{\hat{T}}\$. I am not sure how to do this, I've got the rules of connection in a series or parallel, but I ...
5
votes
1answer
206 views
Using impulse response to control the system
This post by Olin Lathrop is rather inspiring.
The system response is the convolution of the control input with this
impulse response, computed every control sample, which is every 500 ms
in ...
1
vote
2answers
255 views
Which component can control the heat of a hot plate?
About this kind of hot plate I was told, quote:
That's very bad because potentiometer needs to emit power which is sufficient part of all heater consumption. In this case we cannot use ...
2
votes
2answers
118 views
How do i control a pressure?
I am looking for a component which can help me controlling the pressure in a tube.
I explain :
I have a compressor which blow some air in a tube. The compressor blow up to 8 bar and the tube is ...
6
votes
3answers
4k views
Control differences between ac induction motor and brushless dc motor?
I have a fairly solid background in industrial AC motor control (soft starters, VFDs, etc.) but something that I'm certainly NOT well versed in is brushless DC motors... the type found in every hard ...
3
votes
1answer
653 views
1-10V fluorescent lighting digital control
I have a number of fluorescent lights installed that use 1-10V dimming. Note that this is not the same as 0-10V dimming as used in older theatre equipment.
The control gear for the lights outputs 10V ...
1
vote
2answers
201 views
Block Diagrams with offset in control theory
I have an equation in the form $$y = mx+b$$. In block diagram form, I could draw this with a proportional gain block and a summer. I was wondering if there are some clever tricks where I can make ...
5
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2answers
401 views
Controlling a power strip with a toggle switch. Flight sim design
I am building a cockpit. It will function basically as a flight simulator but for a different game. Mechwarrior online. a Mechpit. Here is my problem.
Toggle switch 1 when flipped on turns on the ...
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1answer
324 views
Smallest Delay Possible in a RF Remote Control
I have a very basic knowledge on electronics but that's it. so I don't know this topic well. Altho, I'm able to assembly a circuit , check it and make it work.
I've been searching for info about RF ...
7
votes
1answer
271 views
Conversion of PID controller components with state feedback into single transfer function and discrete state-space form
I've been wrestling with this problem for about a week now, as a part of a year-long project. We're designing a controller for a specific reactor based on a model. After looking at this for a while, I ...
4
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3answers
237 views
Help finding transfer function for root locus using Matlab
I'd like to pick \$k_d\$ using root locus method, but have problems deriving the necessary transfer function of the system presented below. Assume \$k_p\$ is fixed. The question originates from Randal ...
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1answer
73 views
Industrial Networks [closed]
I have been trying o figure out the differences in the several fieldbus protocols used in control networks in industry, what are they?
