Monday, 20 February 2012

PID control of DC motor

Under stand the PID control of DC motor
set Kp=0.1 and varies Kp
or ......
then simulate and read /sigama and Ts
make table and discuss it

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PID control materials:

 PID control on simulink
http://wenku.baidu.com/view/41350dbff121dd36a32d8217.html?from=rec&pos=2&weight=6&lastweight=5&count=4 

PID Design Method for the DC Motor Position
http://www.engin.umich.edu/group/ctm/examples/motor2/PID2.html


PID Design Method for DC Motor Speed Control
http://www.engin.umich.edu/group/ctm/examples/motor/PID2.html 

designing a pid controller for a dc-motor [video demo]
http://www.mathworks.co.uk/products/demos/slcontrol/designing-a-pid-controller-for-a-dc-motor-video-demo/ 

DC Motor Position PD & PID Controllers
http://www.psut.edu.jo/sites/alasali/Control%20Lab%20New/Experiment7%20New.pdf

On a Modification of the PID Controller
http://www.springerlink.com/content/r53v678v02522542/fulltext.pdf 

PID controller
http://www.ecircuitcenter.com/circuits/pid1/pid1.htm

What The Gains Do
http://www.hitex.com/fileadmin/img/download/Basic_DC_Motor_Speed_PID_Control_With_The_Infineon_C167_Family.pdf

 Integral Gain: Ensures that under steady state conditions that the motor speed (almost) exactly matches the setpoint speed. A low gain can make the controller slow to push the speed to the setpoint but excessive gain can cause hunting around the setpoint speed. In less extreme cases, it can cause overshoot whereby the speed passes through the setpoint and then approaches the required speed from the opposite direction. Unfortunately, sufficient gain to quickly achieve the setpoint speed can cause overshoot and even oscillation but the other terms can be used to damp this out.
Proportional Gain: Gives fast response to sudden load changes and can reduce instability caused by high integral gain. This gain is typically many times higher than the integral gain so that relatively small deviations in speed are corrected while the integral gain slowly moves the speed to the sepoint. Like integral gain, when set too high, proportional gain can cause a "hard" oscillation of a few Hertz in motor speed.
Derivative Gain: Can be used to give a very fast response to sudden changes in motor speed. Within simple PID controllers it can be difficult to generate a derivative term in the output that has any significant effect on motor speed. It can be deployed to reduce the rapid speed oscillation caused by high proportional gain. However, in many controllers, it is not used.

Tuesday, 14 February 2012

Project poster



Poster Guidelines: ·   
 Poster boards are A1 size ·    
Ask the technicians for one during lab sessions ·    
One board per group only (think before you stick anything to it!) ·    
You are responsible for printing, this can be several A4 sized pieces or one large A1 piece ·         Remember to use high quality images and be aware of what things will look like at the final print size. ·   
 There are no official rules for how to design your poster, make it look professional and ensure you include your project title, student names and group number somewhere. ·  
 Consider generating a QR code and placing this on your poster with a link to your blog ·    
It is your choice if you present your poster in portrait or landscape form. Try sketching the layout of your poster design before you start adding the details.
Attached is a template including a large size University crest for you to modify.
qrcode 

Sunday, 12 February 2012

Project objectives


This project will investigate the mathematical model and the operation principle of a DC motor. Main objectives are listed as following:
1. Understand the operation principle of a brushed DC motor;
2. Investigate the torque and speed control of the DC motor. Build up the mathematical model of a brushed DC motor with torque and speed control loop;
3. Simulate the brushed DC motor by using Matlab /Simulink, based on the model built on step 2.
4. Review different types of DC motor: stepper motor, brushless dc motor, uncommutated etc.

LaTex

online equation editor
http://www.codecogs.com/latex/eqneditor.php

Images as Figures

There are many scenarios where you might want to accompany an image with a caption and possibly a cross-reference. This is done using the figure environment. The following code sample shows the bare minimum required to use an image as a figure.
\begin{figure}[htb]
\includegraphics{image.png}
\end{figure}
The above code extract is relatively trivial, and doesn't offer much functionality. The following code sample shows an extended use of the figure environment which is almost universally useful, offering a caption and label, centering the image and scaling it to 80% of the width of the text.
\begin{figure}[htb]
\centering
\includegraphics[width=0.8\textwidth]{image.png}
\caption{Awesome Image}
\label{fig:awesome_image}
\end{figure}
The figure environment is not exclusively used for images. More information on the figure environment and how to use it can be found in Floats, Figures and Captions.

Tuesday, 7 February 2012

Dynamic analysis for DC motor

DC Motor Speed Control Methods Using MATLAB/Simulink
http://onlinelibrary.wiley.com/doi/10.1002/cae.20151/pdf

Dynamic Analysis of Variable-Reluctance Permanent-Magnet Brushless DC Motors
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=254776

Transient Analysis and Output Characteristics of DC Motors Fed by Photovoltaic Systems
http://jjmie.hu.edu.jo/files/v4n1/26.pdf

Control system, deferential equation