Learndrives

General Course of Electrical Drives

General Course of Electrical Drives

[03/13/19]   Q:
What is my grade in Supply Converters?

A:
1. Please, summarise the scores of all your quizzes and bonuses and round up this sum.
2. If you are not satisfied, learn more from textbooks and lecture slides and try your knowledge in Moodle (AAV0060 Quizzes/TRY).
3. Once you will feel your readiness, write me to decide the date of your demonstration on the laboratory PC. The new value will replace your current grade. If you are not satisfied again, return to item 2.
All the best ;)

[03/13/19]   Q:

Boost converter. Uout ?

A:
Thank you. Corrected for everybody who has the same!

[01/08/19]   Q:
May i use these consultation days for examination?

A:
Yes, it is possible. The final examination date is 23.01.2019 at 10:00 in NRG-431

[01/08/19]   Q:
I'd like to ask about consultations.

A:
You are welcome 9, 21 and 22 of January at 10-12 in NRG-431

[12/20/18]   Q:
When is the ultimate deadline for reports uploading?

A:
Upload please your reports as soon as possible aiming to continue you trying to defend them by examination. Keep in mind please that, during the holidays, Moodle doesn't guaranties the service on its regular base (and neither am I).

[12/17/18]   Q:
If I would write the exam in advance in December, whether it'll be counted as one of the usually available 2 tries for an exam or is it 1 preliminary +2 examination session chances?

A:
All students are participating on an equal footing: 1 examination and 1 re-examination. In December, I made appointments for a consultation. Of course, you may use it for examination, instead of the session dates, but not as an additional chance.

[12/11/18]   Q:
I did not really understand the exam description. Are we supposed to learn about one problem to write about and solve or should we learn about all of them and a random one will be in the exam? And the two questions of the quizzes will be random?

A:
You should learn about circuits, main formulas, and diagrams from all of them. Each problem corresponds to a particular lecture. A random one will be in the exam. The two questions from the quizzes will be random. The list of lectures and the main quiz questions are published in Moodle. The examination rules are explained the last lecture file.

[12/08/18]   Q:
Is it possible to write final examination in December as I have bought tickets already?

A:
Every student can take the examination ahead of schedule 11, 13, 18, 20.12.2018 at 12:00 in NRG-431 after he/she passes all laboratory reports and (for AAV0060) all exercises reports. Re-examination date: 23.01.2019 10:00 nrg-422.

[12/06/18]   Q:
When can I come to defend my exercises?

A:
On Friday 7.12 at 8:00 - the last lesson in the computer class NRG-223. After that – each Tuesday and Thursday at 12:00 in NRG 431 you may defend your LabView exercises, receive advice regarding labs and exams, complete and redo the lab tasks, or pass the examination ahead of schedule.

[12/02/18]   Q:
I noticed the information about how bonus points affect the grade is in moodle. Could you please remind me how many bonus points do we get for extra LabViews and laboratory works?

A:
For AAV0060, each additional exercise gives 1 bonus point. The last lesson in NRG-223 is scheduled to Friday 7, 8:00. Since your lab classes have run out, bonuses are not available there.

However, consultations for AAV0060 and AAV0081 are ongoing in NRG-431 on TU, TH 12:00-13:00.

[11/30/18]   Consultations in December:

Tuesday 12:00-13:00 NRG-431
Thursday 12:00-13:00 NRG-431

[11/26/18]   Q:
I would like to ask a question about the graphs obtained in the Induction Motor Stand lab work. As you have mentioned, the nominal experimental data cannot be larger than the passport data. But how should I then understand the graph that we have obtained during the lab? Could it be that I have to read the current graph from right to
left? Thank you in advance for your help.

A:
Yes, experimental nominal data cannot exceed the passport ones. This follows from the last lecture where the mechanical, n(T), and electromechanical, n(I), characteristics were introduced. They demonstrate that starting torque and current have to be as great as possible for successful motor running. They also show that nominal point is just near the maximal speed to provide good overload capacity. These rules are common for all types of motors.

[11/19/18]   Q:
Sometimes, I cannot find explanations of my experimental results in the lecture notes. How to draw conclusions in this case?

A:
Labs help you get an experience in observation of new phenomena. This is a real way to science and to practice. If you found something unknown, you may search explanations in lectures and books. If everything is evident, no labs are needed.

Below, an example from your teammate’s conclusions is given:

“The following conclusions can be drawn from this laboratory work: 1). Fastest way to stop the motor is using DC Braking at maximal current. It is very quick, in one case it was instantaneous. DC Braking is thus a good method of stopping AC motors in case of emergencies. 2). There is a correlation between the PWM frequency and audible electrical noise. A higher frequency causes noise with a higher pitch. Although it could not be tested, a frequency above 20 kHz should thus be inaudible (range of human hearing is between 20 Hz and 20 kHz). 3). Assigning a boosting level to the motor allows for controlling the torque.”

This student has learned a lot from experimentation. Now, it’s time to find explanations in theory.

[11/18/18]   Q:
I have misunderstood the values written on the nameplate. Under current I see 1,7/1,0 A and, additionally, the nameplate includes two voltages - 230 and 400 V. Does it matter which one we take for the calculations?

A:
3-phase motor can develop one and the same power at low supply voltage/high current and at high voltage/small current. Depending on the grid voltage, an electrician chooses the method of winding connection: delta (D) or star (Y). Nameplate example: "D/Y - 230/400 V, 1.7/1.0 A". The supply voltage in our laboratory is 230 V.

Learndrives's cover photo

[11/16/18]   Q:
May you repeat please how to prepare the LabVIEW exercise report shown as Sample report in AAV0060?

A:
1) Demonstrate your VI and appropriate Sub-VIs in the computer class NRG-231 (every Friday, 8:00 in November).
2) While your VI is open:
• File.Print.VariantName,
• Next.Icon, description, panel and diagram,
• Next.Rich Text Format (RTF) file,
• Print
3) Repeat these steps for each your Sub-VI
4) Merge all RTF files together, add the title sheet and conclusions, and upload as EXE1, etc.

[11/15/18]   Q:
i just wondering if you could tell me if there is a requirement amount of theoretical class we have to attempt to go to exam or if an absence would affect the final grade.

A:
Lecture attendance is optional in TalTech. You visit lectures to increase your knowledge and to answer your questions in the future speciality. As well, lectures help you in quizzing, which is also optional but may increase your final grade.

Exams are compulsory of course. Detailed requirements for getting access to exams depend on the course you study. They were announced in the first lecture (see an appropriate OIS reference and .pdf file in Moodle, and my advises appeared earlier in this page). Examination dates and questions are published in Moodle and in this page as well.

To get access to examination in AAV0060, you need: 1) Conduct 5 labs, then upload your reports, and pass them successfully. 2) Defend 5 LabVIEW exercises in computer class, upload your reports, and pass them successfully.

To get access to examination in AAV0081, you need conduct 4 labs, then upload your reports, and pass them successfully.

[11/09/18]   Q:
I couldn’t find a quiz scheduled for 12th November.

A:
On this date, invited lecture Dr. Elmo Pettai will give the presentation “Innovations for your benefit”. To get a bonus, ask him your question and then email this question to [email protected] to be scored. If you’ve run out of time during this lecture, send from 1 to 4 questions to: [email protected] and cc: [email protected] and take both the answers and the scores together. Please, don’t cheat off another student rather than self-destruct both.

[11/03/18]   Q:
Is it really worth so much emphasis on the waveforms and circuits?

A:
Waveforms and circuits serve as a language of communication for all electricians, just like the ECG is vital for all physicians or notes - for musicians. If you came to understand electricity, you have no alternative but to learn them.

[10/31/18]   Q:
Where may I watch correct waveforms for my laboratory rectifier?

A:
Apply your LabVIEW experience. You can simulate any type of rectifier at different supply frequencies and amplitudes. Moreover, you may save this result (right click on the waveform chart) for the laboratory report

[10/30/18]   Examinations days/times/room

1. MVEB51 (AAV0060) 07.01.2019 10:00 NRG-422
2. MVEB52 (AAV0060) 08.01.2019 10:00 NRG-422
3. AAAM31 (AAV0050) 09.01.2019 12:00 NRG-422
4. MAHB51 (AAV0081) 10.01.2019 10:00 NRG-422
5. MAHB52 (AAV0081) 11.01.2019 10:00 NRG-422

[10/24/18]   Q:
Could you please explain how to find the time of the waveforms? I may just replicate the image gotten from the program.

A: It is taught now in elementary schools about taking pictures and mailing. From university you expect to learn to understand and to think outside the box. If you have a picture from the oscilloscope, find out the time scale in this picture. If you have a screen damp with the transistor duty ratio, find out the switching frequency in the manual; one switching period is equal to 100% duty ratio. If you have a screen damp with the thyristor angle, find out the supply frequency of Estonian electricity network; one supply period is equal to 360 electrical degrees.

[10/24/18]   Q:
I am coming to the last lab. Explain please, how can I use optional problems to increase my bonus.

A:
Each laboratory work in your manuals has an “Optional problems” section. Every problem represents a small research, which involves experimentation, mathematical and physical explanation, calculation, and graphical representation of the results obtained. For Power Electronics labs, simulation is required to prove your results. A student, who passed all the mandatory works and has an unused lesson, may select one of these problems from any work. Those, who have 2 or 3 unused lessons, may select 2 or 3 problems. Please, agree your choice with an instructor to avoid duplication. Upload your report via the LAB+ section of Moodle and get the bonus, 4 for each problem 😉

502 Bad Gateway

Q:
In examination session, I have to be away of Tallinn on some urgent obstacles. May I pass the exam in another date?

A:,
The examination session for all students will take place from 2.01 until 23.01.2019. With those who passed all the labs and exercises prematurely, we may agree an examination date before Christmas. Both the laboratory and the computer class will be closed from 23.12 until the next semester (see TTU Academic calendar in Ois).

ois.ttu.ee

[10/05/18]   Q:
I would like to know what kind of compulsory labs and exercises do we need to do for getting access to the exam.

A:
For AAV0081 “General course of electrical drives” – 4 labs have to be successfully passed before Christmas. For AAV0060 “Electrical drives and power electronics” – 5 labs and 5 computer exercises need to be demonstrated and reported. Once the compulsory part is completed, students may conduct optional labs and exercises using an additional lesson scheduled in their timetables. As well, they may optionally participate in regular quizzes and on-lecture assignments. Read more about the active learning system from the First lecture slides.

[09/26/18]   Q:
Hello, Lab report can be found attached to this email.

A:
Please, avoid sending your reports by email. Instead, upload them in Moodle to validate plagiarism and standards. To be successful, do not include there photos, screen dumps, fragments from books and manuals. Acceptable formats: .doc, .docx, and .pdf. Pay attention to “Standards” and “Sample report” files in Moodle.

[09/25/18]   Q:
“Moodle fixed plagiarism”. What does it mean?

A:
The new Moodle URKUND plugin found plagiarism in your report. It means, using the common team protocol, YOU MUST REPORT INDIVIDUALLY. It concerns the title sheet, the circuit diagrams, experimental tables, all the plots, and conclusions.

[09/23/18]   Q:
Could you please upload your lecture slides, preferably before the class so that we can have them at hand as we follow along your lecture.

A:
Unfortunately, the slides are finally generated either immediately prior to the lecture or even during the lecture dependently on the students’ appreciation. The quiz is not an end in itself, therefore it is your option to follow it or not. However, we may clarify the quiz contents during the lecture day or later. Especially, that the trial questions are published in Moodle. Either way, I am ready to correct the quizzes and lecture material with your help.

[09/21/18]   Q:
I would like some clarification on how horsepower is not a unit of power? What is your though here?
A:
Thank you for help. This is an obvious error. All students selected hp in the first quiz will be regraded.

[09/19/18]   Q:
I simulated a single-phase rectifier in LabVIEW, but why the DC Voltmeter showing nothing?

A:
When going through the While loop tunnel, set the Tunnel Mode property to Indexing. It helps you collect voltage during the loop cycle. When this cycle ends, the voltmeter will show the average value.

[09/17/18]   Q:
In the laboratory work “Diode rectifiers”, the task is to plot loading and ripple diagrams. I want to ask where I could find the formulae which would describe both graphs.

A:
"Loading diagram" means a curve of voltage with respect to current (section “Output characteristics” in the textbook). Take your experimentally obtained measurements from voltmeter and ammeter and plot the line across these three points. "Ripple diagram" means a curve of ripple voltage with respect to current. The ripple voltage (Urpp – peak-to-peak voltage) formula is given in the manual and in the textbook (section “Rectified data”).

[09/03/18]   IEEE jõuelektroonika seltsi presidendi Prof. Frede Blaabjerg'i avalik loeng TTÜ-s 17. septembril kell 10:00 NRG-422

Esmaspäeval 17.09.2018 kell 10:00 esineb auditooriumis NRG-422 IEEE jõuelektroonika seltsi (IEEE-PELS) president ja Aalborgi ülikooli professor Frede Blaabjerg avaliku loenguga teemal "POWER ELECTRONICS RESEARCH AT AALBORG UNIVERSITY".

Professor Frede Blaabjerg on rahvusvaheliselt kõrgelt hinnatud jõuelektroonika ekspert ja juhtivaid teadlasi maailmas. Tema teaduslik panus on tähelepanuväärne - üle 500 publikatsiooni kõrgetasemelistes eelretsenseeritavates teadusajakirjades, Google Scholar h-indeks 130.

Loeng on korraldatud Energia ja Geotehnika doktorikooli poolt ja toimub inglise keeles. Kõik huvilised on oodatud loengut kuulama!

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