Matlab v2018a or above is required to run this file. Click the link below to download the file.
>> Download Lab 1
- عند تنزيل الملف تاكد من ان يكون اسم الملف خالي من الفراغات و الاقواس وعلامة الناقص.
- احفظ الفايل في ملف جديد ويكون اسم الملف خالي من الفراغات و علامة الناقص.
- "LAB1_HANDOUT_FILE_001v2.slx" تاكد من ان اسم الملف.
- تاكد من ان اسم الملف الكامل لا يحتوي على فراغات او اقواس او علامة الناقص.
- Run the simulation for a simulation time of 2 seconds with a constant DC voltage of 1V and no load torque.
- Assuming constant flux, when steady-state is reached, calculate motor parameters Ra, K PHI, and no load armature current.
- Record and plot Ia (A), speed (RPM), T (N.m), Load torque (N.m), and back EMF (V).
- Explain via plots and equations the behaviours of Ia, speed, motor torque and back EMF at the starting.
- Run the simulation again for a simulation time of 2 seconds with a constant DC voltage of 1V and load torque of 8 N.m.
- Record in a table measurements of maximum Ia, maximum T, maximum speed, and maximum E.
- Calculate motor parameters Ra, K PHI, and no load armature current. Verify your findings with step 1.
- Record and plot Ia (A), speed (RPM), T (N.m), Load torque (N.m), and back EMF (V).
- Explain via commenting in the report on plots and equations the behaviours of Ia, speed, motor torque and back EMF.
- Run the simulation for a simulation time of 400 seconds.
- Remove the constant voltage supply block Vdc1 and connect the variable voltage supply Vdc2 and right click to uncomment.
- Record in a table measurements of maximum Ia, maximum T, maximum speed, and maximum E for every Vdc2 level.
- Create a table with the calculated motor parameters Ra, K PHI, and no load armature current for each Vdc2 level and Verify your findings with step 1 and 2.
- Record and plot Vdc2 (V), Ia (A), speed (RPM), T (N.m), Load torque (N.m), and back EMF (V).
- Run the simulation for a simulation time of 400 seconds.
- Connect and the rate limiter block between Vdc2 and the motor. Right click the block and uncomment to activate it.
- Record and plot Vdc (V), Ia (A), speed (RPM), T (N.m), Load torque (N.m), and back EMF (V).
- Explain via commenting in the report on plots and figures the behaviours of Ia, speed, motor torque and back EMF during Vdc2 change and during steady state.
- Run the simulation for a simulation time of 400 seconds.
- Remove TL1 and connect TL2. Right click TL2 and uncomment.
- Record and plot Vdc (V), Ia (A), speed (RPM), T (N.m), Load torque (N.m), and back EMF (V).
- Explain via commenting in the report on plots and figures the behaviours of Ia, speed, motor torque and back EMF during Vdc2 change and during steady state. Especially during motor speed changes.
- Run the simulation for a simulation time of 400 seconds.
- When the motor speed reaches approximately 1800 RPM, adjust Vdc2 so that the motor maintains constant speed operation even during torque load changes.
- Record and plot Vdc (V), Ia (A), speed (RPM), T (N.m), Load torque (N.m), and back EMF (V).
- Explain via commenting in the report on plots and figures the behaviours of Ia, speed, motor torque and back EMF during Vdc2 change and during steady state. Especially during constant speed operation.
Write, in your own words (arabic or english) about the experience and challenges during this lab experiment. Highlight the strog concepts aquired and mention any weaknesses. Suggest any improvement.
Matlab v2018a or above is required to run this file. Click the link below to download the file.
>> Download Lab 2
- 1. عند تنزيل الملف تاكد من ان يكون اسم الملف خالي من الفراغات و الاقواس وعلامة الناقص
- 2. احفظ الفايل في ملف جديد ويكون اسم الملف خالي من الفراغات و علامة الناقص
- 3. "LAB1_HANDOUT_FILE_002v2.slx" تاكد من ان اسم الملف
- 4. تاكد من ان اسم الملف الكامل لا يحتوي على فراغات او اقواس او علامة الناقص
- Set α to be 30o
- Create a table of initial measurements of α, β, back EMF, Ia, T, and motor armature resistance and inductance.
- Calculate the value of Z
- Calculate the value of Kϕ from the torque equation.
- Verify the value of Kϕ using the back EMF equation.
- Calculate the percent error in Kϕ. [error should not exceed 0.1%]
Verify the mesured back EMF value by using the back EMF equation
E=(β−α)Vm(cosα−cosB)−(β−α)RaIa
- Calculate the percent error in E. If the error is larger than 2%, re-measure the angle β so that the value of Va settles at the value of E and recalculagte the % error.
Using the equation below, verify that the value of β satisfies the equality. If there is discrepancy, adjust β so that the equation is satisfied within 0.1% error margin.
0=ZVmsin(β−θ)−RaE+[RaE−ZVmsin(β−θ)]⋅e−(β−α)cot(θ)
- Using the new value of β, recalculate the back EMF.
- Using the new value of β, calculate ωm using the following equation and compare with the measurement value by calculating the percent error.
ωm=kϕ(β−α)Vm(cosα−cosβ)−(Kϕ)2(β−α)T⋅Ra⋅π
Write, in your own words (arabic or english) about the experience and challenges during this lab experiment. Highlight the strog concepts aquired and mention any weaknesses. Suggest any improvement.
Matlab v2018a or above is required to run this file. Click the link below to download the file.
>> Download Lab 3
عند تنزيل الملف تاكد من ان يكون اسم الملف خالي من الفراغات و الاقواس وعلامة الناقص
- Uncompress 'LAB3_SPEED_CONTROL_DC_MOTOR_ACDC.zip' into the MATLAB document folder.
- Ensure to save the Lab 3 folder in the MATLAB folder and verify that the name of the folder does not contain invalid characters.
In this experiment, the speed of the DC-motor is controlled by using an open-loop voltage control via firing angle α of the SCR based SP-FC-FWR and a closed loop speed control via speed and current PI control. The purpose of this experiment is to implement a close-loop speed control of a DC-motor drive. The standard 5HP DC-motor is used where its parameters are given in the motor block of the experiment. The controller will be tested on a simulation model of the DC-motor.
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Explain two advantages of the Electric Drive System of the Electric motors?
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A very important power electronic device is the Silicon Controlled Rectifier "SCR". Explain the construction, the function and the characteristics of the device.
- Run the simulation (with default configuration parameters) for the following two cases. Compare the observed values with calculated values. Save the plots and include them in your report.
- Case 1: Open-loop voltage control [Lab_3_SP_FC_FWR_DC_MOTOR_FOC_CASE1_v1.slx]
- Case 2: Closed-loop speed control [Lab_3_SP_FC_FWR_DC_MOTOR_FOC_CASE2_v1.slz]
- Adjust α to be between 0 and 179 degrees and observe the relationship with speed changes.
- Set the load torque for CASE 1 to be
Time=[0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45];
TL=[2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32];
- Set the reference speed for CASE 2 to be
Time=[0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45];
TL=[2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32];
SPEED=100*[1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1];
- Explaint the controller of the motor in more details and elaborate on control strategy structure flow and investigate the advantages and disadvantages of the PI controller method.
- What is the power factor at rated speed? use the motor parameters and verify using the output mechanical power considering losses.
- When changing alpha from 30, 60, 90, 120 and 150 degrees, record the speed of the motor for each case and calculate the related armature voltage and current assuming constant load of 20 N.m.
- Change the reference speed to 800RPM by myliplying the speed vector by 8 as in
SPEED=SPEED*8;
Observe and compare the speed and torque ripple for both cases (100 rpm and 800 rpm), give an explanation for the differences.
In yout own words, write the advantages and benefits for adapting a speed controller. What are the limitations when implementing a SP-FC-FWR for DC motor speed control?
Matlab v2018a or above is required to run this file. Click the link below to download the file.
>> Download Lab 4
<button onclick="window.location.href='#lab4';"class="btn btn1">Link to Lab 4 meeting
عند تنزيل الملف تاكد من ان يكون اسم الملف خالي من الفراغات و الاقواس وعلامة الناقص
- Uncompress 'LAB4_FOUR_QUAD_CHOPPER.zip' into the MATLAB document folder.
- Ensure to save the Lab 4 folder in the MATLAB folder and verify that the name of the folder does not contain invalid characters.
In Lab 3 experiment, motor speed control was achieved via a single-phase fully-controlled thyristor-based fullwave rectifier and speed control was demonstrated. In this Lab, the objectives are:
- Observe the four-quadrant speed operation of a DC motor.
- Control the speed of the DC motor and observe the effect of a stepped torque.
- Save the waveform for the speed, torque, armature current and armature voltage label the quadrant of operation. [D_ref: 0.3, 0.6, 0.9; Torque: 20 N.m, -20 N.m]
- Give a step change in load torque from 0 to 20 N.m (TL) at t = 1 s and note the resultant speed for each D_ref setting. Elaborate on the effect of changing D_ref.
- Theoretically estimate the no-load speed value in rpm for each case
- What is the net power supplied by the motor? What is the quadrant of operation for all the scenarios?
- Save the waveform for the speed, reference speed, torque, armature current and armature voltage label the quadrant of operation.
- Give a step change in load torque from 0 to 20 N.m (TL) at t = 1 s and note the resultant speed.
- Theoretically estimate the no-load speed value in rpm.
- What is the net power supplied by the motor? What is the quadrant of operation?
- repeat tasks 1-4 for all of the combinations of step torque and reference speed. [speed: 1000 rpm, -1000 rpm; Torque: 20 N.m, -20 N.m]
- Explaint the controller of the motor in more details and elaborate on control strategy structure flow and investigate the advantages and disadvantages of the PI controller method.
- What is the power factor at rated speed? use the motor parameters and verify using the output mechanical power considering losses.
- When changing D_ref from 0.3, 0.6, 0.9 record the speed of the motor for each case and calculate the related armature voltage and current assuming constant load.
- Compare the results of this experiment with the results from Lab 3 experiment, What are your observations and findings egarding the two methods?
- Describe the advantages of this method of speed control.
In yout own words, write the advantages and benefits for adapting this speed controller. What are the limitations, if any, when implementing a four quadrant DC chopper for DC motor speed control?