People are paying many $ bills to get a teaching from this dude. We up here getting arguably a better experience then the class room in some ways, for free(ish). Awesome time we live in.

@tonybryan5181

2 жыл бұрын

You can tell that the man loves teaching :

If all teachers in the school system had been as good as you at explaining, .... Thank you professor

@WeberAuto

3 жыл бұрын

Wow, thanks! Thanks for watching!

Long video? Yes. But if you want to explain something right down to the details, time has to be taken. Thanks for another insightful and clearly explained bit of Tesla technique!

@WeberAuto

3 жыл бұрын

Thank you very much

@MattExzy

3 жыл бұрын

That time flew by, really. Definitely didn't feel like a 46 minute video at all.

Was waiting for this one! You are an excellent teacher!

@WeberAuto

3 жыл бұрын

Thank you very much

Great videos. The high performance motors are induction machines to get around the problem of back EMF caused output power loss at higher speeds. Comes down to a tradeoff: Constant power over the full operational span at the cost of increased overall energy losses, or higher efficiency for decreased output power as speed increases? A magnet moving past a field creates a voltage proportional to the magnet strength and speed (back emf). A permanent magnet always has a strong magnetic field in the rotor. So, at some speed, the back emf exceeds the bus (battery) voltage and no more torque can be generated (flux weakening can help this, but eventually, no useful work can be done). But, because no rotor magnetization current is needed, PM based motors are much more efficient. None of the current in the motor is spent creating a magnetic field in the rotor. No rotor losses. For induction machines, the rotor acts as the secondary of a transformer. The current induced in the rotor (from the stator, primary) creates the rotor magnetic field that can then be used to create torque (via a process described as slip). This means the current in the rotor can be controlled. Because the current in the rotor can be controlled, the back emf can be controlled. Because the magnetic field in the rotor is controllable, constant mechanical power can be output until the variable frequency drive (VFD, converter) can no longer output higher frequencies. The penalty is rotor loses. Because there is current flowing in the rotor, induced by the stator, this power is lost in the form of rotor current (resistance of the rotor circuit). You have to pay, in terms of input electrical power, to create the rotor magnetization, therefore, less overall efficiency. But, constant mechanical power for the full operational frequency of the VFD. You can see this by spinning a motor by itself. A PM motor will generate a voltage as it freewheels, DMM between any two leads. (No current, because there's no circuit. Completing the circuit will make it a generator and the PM motor will act as a brake) An induction machine won't. (There will be a small residual voltage if it's an iron core, because of residual rotor margination, but not much) Applying a constant (DC) current to the windings of an induction machine (current limited power supply between one of the phase pairs, be sure to limit the power to something that won't damage the stator by too much heat), and spinning the rotor will make it feel like it turning thru peanut butter, the shaft will get stiffer as you try and spin it faster. Doing the same to a PM machine will make it 'cog' or make it unable to spin (by hand) at all. Be carefully at startup. It may turn very quickly with great force when current is first applied. If it's an IPM machine, there might be some cogging due to the motor saliency, e.g. the Nissan Leaf does this. I hope this was understandable and useful.

@thebrain7693

3 ай бұрын

found this reply, very cool. was wondering if u know how induction motor can create regen. i just don't get how it can power the motor to induce field n receive current from motor at the same time...

Another excellent presentation. Thank you, professor !

@WeberAuto

3 жыл бұрын

You are very welcome. Thanks for watching

This guy is the absolute best. I have watched his amazing videos and was able to pass my L3. Thank you so much!

@WeberAuto

3 жыл бұрын

That is awesome! Congratulations on passing your ASE L3 exam

@user-ru2hf1sg4e

3 жыл бұрын

@@WeberAuto thank you, i learned so much from you and cant thank you enough. You are an amazing teacher

@WeberAuto

3 жыл бұрын

@@user-ru2hf1sg4e Thank you

Thank you (again!) professor for another illuminating session on the Tesla system. I know that there are many, many hours (days or weeks) of research and disassembly/re-assembly, editing and other real, unseen work that goes into your presentations. Thank you so much for these condensed, easy-to-understand tutorials on these very complex systems. Great nutrition for curious minds!

WOW, Professor Kelly is a wealth of information. He does an excellent job of explaining the inner workings of Teslas. Great job Professor.

Thank you Professor Kelly for your efforts to keep us informed! They are much appreciated!

@WeberAuto

3 жыл бұрын

Glad you like them!

Woo, another amazing video! Thanks a lot Professor Kelly! Your explanation makes the complicated stuff easy to understand!

Thank you Professor Kelly. You have made it possible for those of us in the developing world (I am in Ghana) to also learn and have an understanding of the new tech underneath the EV drivetrains. These videos are an absolute germ and it is my hope that we can all contribute to ensure its sustenance. Thank you once again.

Weber! Been up there for some auto competitions back in the day and met you YEARS ago. Glad you guys are still one of the top schools for auto tech out there. Keep killing it WSU!

@WeberAuto

3 жыл бұрын

Awesome! Thank you very much

So glad I found your channel! Thanks prof. Kelly for yet another great video

@WeberAuto

3 жыл бұрын

You are so welcome!

I know that your time, painstaking effort and expertise is very much appreciated. This is so interesting and you present it so well - thank you Professor. I like the fact that, notwithstanding your great knowledge, this is also rather a journey of discovery for you - it accentuates your enthusiasm which is as infectious as it is genuine. May I wish you a very Merry Christmas.

You are an excellent person who has the ability to explain complex concepts in a captive dialogue. Thank you. From Mal R

@WeberAuto

3 жыл бұрын

You are very welcome

Really good explanation of how the system is working thank you man for transfering tour knowledge

I'm very impressed with the level of knowledge transfer, and honesty when he says details about things he doesn't know. I wish when I had go to school, I had more professors like this that were driven for a quest for knowledge and not their ego or reputation. He also understands, as shown in these videos, that he could know everything in the world, but if he doesn't share it, that knowledge is useless. In his case, he shares what he knows, and honestly wants people to help him learn even more where he may not know something in as far a depth as he would like.

@WeberAuto

3 жыл бұрын

Thank you very much!

Thank you for sharing knowledge captain!

thanks Prof. Kelly for your and team's work on this video and for sharing it. I am so amazed at the the 17,000 RPM operating speed of the motor. I suppose that is what you can do when nothing reciprocates! Your videos about Tesla vehicles specifically also make it abundantly clear why they generally cost so much: it takes so many precision parts and so much design work! 😅 Happy Easter too 🌄

@WeberAuto

3 жыл бұрын

Thank you, Happy Easter

This is the most comprehensive video about tesla motor! Thank you very much!

@WeberAuto

3 жыл бұрын

Thanks for watching!

Been watching since the 2nd Gen Volt videos. Now with a CyberTruck pre-order I’m enjoying the detailed dives into Tesla’s tech. Thank you so much for producing these!

@WeberAuto

2 жыл бұрын

Thanks for your long time support!

The best explanation of the Tesla motor set on Internet. Thank you

@WeberAuto

3 жыл бұрын

Wow, thanks!

Excellent Professor John -hope to join you soon in person

Professor John Kelly, I was once an Electronics Tech at Weber State College, working for Sid Jensen back in 1969 through 1973. I wish I am younger to attend your classes on line or in person. I am a life long techie and find your teaching as excellent. The circular lecture hall was brand new in 1969. I did a Google Map of Weber State University, showing Engineering Technology Centre with what seems tobe new construction of Engineering Tech buildings.

Thanks for your great effort and making this material publicly available! Excellent! Top marks, it i may! 😀

@WeberAuto

3 жыл бұрын

Thank you

my eyes are on a rav4 prime... but i still love learning about how teslas do what they do. thank you for sharing your knowledge!

Excellent video. I love seeing these parts exposed.

@WeberAuto

3 жыл бұрын

Glad you enjoyed it, Thanks for watching

Very informative and detailed video. Thank you for sharing it Prof. Kelly.

@WeberAuto

3 жыл бұрын

You are so welcome!

Thanks for another great video. It's nice to get reliable, well researched information. Thanks for sharing.

@WeberAuto

3 жыл бұрын

Thanks for watching!

Professor kelly, your tutorial is very well produced, it is excellent, thank you very much for sharing it, from Peru

@WeberAuto

2 жыл бұрын

My pleasure. Thanks for watching

I’m drooling, great detail, clear delivery and hella good vid!

@WeberAuto

2 жыл бұрын

Thanks for watching

Thank you sir for the video. I really admire your dedication.

@WeberAuto

3 жыл бұрын

So nice of you

I find these videos fascinating! Thank You

@WeberAuto

2 жыл бұрын

Thanks for watching!

Thank you so much Prof.that are explein for Tesla S and😍 Front Motor❤🌏

Hello Professor. thank you for your efforts and great videos!!!

Very Educational....Keep up the Good Work.

@WeberAuto

3 жыл бұрын

Thanks, will do!

Long video, but vveeerrryyy satisfying!

Tks Bud. Great work.

Easter 🐣 is early this year. Thank you for another great video professor :)

@WeberAuto

3 жыл бұрын

So nice of you, Thanks for watching

It would be sweet if that was the model s in the background...😊 (thanks for sharing John!)

Thank you for making these excellent videos.

@WeberAuto

3 жыл бұрын

Thank you

As always great video, good explanation, thank you very much!

@WeberAuto

3 жыл бұрын

Thanks for watching

i can only imagine the hours that have gone in to clean all these parts. You are opening my eyes to the amazing engineering that goes into these cars. Who would know your front wheels are a different size than the back, I'm sure owners would just rotate the tires thinking them the same?

@WeberAuto

Жыл бұрын

Thanks for watching

Thank you sir for fine instruction. Truly enjoyable presentation.

@WeberAuto

3 жыл бұрын

You are very welcome

Thank you for this awesome informative video.

@WeberAuto

3 жыл бұрын

Glad you enjoyed it!

Great information from a great teacher

@WeberAuto

3 жыл бұрын

Thanks for watching

So glad you are doing these videos! Top notch quality. Are you still doing the one week class?

@WeberAuto

3 жыл бұрын

Yes I am. We have four more scheduled this year. See www.weber.edu/evtraining for the schedule

@Shiftheads

3 жыл бұрын

@@WeberAuto great! Thank you!

These videos are amazing. The have so much information in them which you dont get normaly.

@WeberAuto

2 жыл бұрын

Glad you like them!

I thought those vehicle motors were much bigger. 259 hp on that little motor is amazing!

@WeberAuto

3 жыл бұрын

They are amazing! Thanks for watching

Simply invaluable, as an ME that wanted to learn more about how these systems work, this level of quality and no BS is a Jahsend. Regarding HX, I would assume counterflow, so if you know the oil flow direction you know the coolant probably flows the other way

@WeberAuto

3 жыл бұрын

Thank you. Good point!

Excellent presentation professor

@WeberAuto

2 жыл бұрын

Glad you liked it!

Wow this was so good, learnt a lot huge Tesla fan and they have some amazing tech chemistry going on in their motors.

@WeberAuto

3 жыл бұрын

Thanks for watching

this is amazing thank you !

Yes, your hypothesis was correct - the more efficient PM motor is used to supply most (all?) torque under certain conditions (e.g. highway cruising). Elon said this was how they are able to get increased range out of the AWD version of the S. It would be interesting to know more details on when this is done (I suspect it's not as often as possible, since the driven wheels affect the handling). Great series. Thanks for all the effort you put into these. I'd love to see more details about the power electronics (inverter) - maybe bring in an EE professor to go deep on the circuit-level design?

@WeberAuto

3 жыл бұрын

Thank you and thanks for the suggestion

@shaunryan6

3 жыл бұрын

Most extra range is from putting more batteries in the car.

Phenomenal reverse engineering presentation on a variety of Tesla electric motors and gears. Thank you for creating these extremely informative technical video's.

@WeberAuto

3 жыл бұрын

Thank you very much

Prof. Kelly I didn't know that the electric parts of the motor are lubricated too, I always thought these motors are complete dry and I wondered how it's possible to cool them. Thank you for the great details you offer. Tesla uses only one permanent magnet motor, because if you have two of them, they give you resistance by being a generator, the iduction motor can run free without inducing any currents. So I guess, when the vehicle is cruising at constant speeds, it will just be powered by the high efficiency reluctant permanent magnet motor, while the induction motor is just idling. Greetings from Bavaria Germany, I bet you have german roots! ;)

@WeberAuto

3 жыл бұрын

Thank you and thanks for the great information. I suspected that was the situation.

@brianb-p6586

2 жыл бұрын

You can use two PM motors. Other AWD production EVs use PM for both axles.

I would love to see you do a tear down with the new model 3, with the octo valve and heat pump. Great videos.

@WeberAuto

3 жыл бұрын

Coming soon! Thanks for watching

Fantastic and exciting to see this--thank you. I wonder if there is an attitude like a steep hill at which the motor's lubricant pump gets starved for oil; this would probably be helpful for owners to know so they could avoid motor damage.

Very interesting video ( as your videos generally are). Thank you!

@WeberAuto

3 жыл бұрын

Glad you like them! Thanks for watching

Best information.Thanks lot.

@WeberAuto

3 жыл бұрын

So nice of you

A man that can except his errors…is someone I will trust with the information given 😌

Thank you for this well done video! Makes me appreciate my P85D more 😅

Thanks for sharing Professor... Cheers.

@WeberAuto

3 жыл бұрын

My pleasure!!

@WeberAuto I realize this video is a year old now and without checking all the comments, I don't know if someone already mentioned this but there are two different rotors for the LDU. The Base & Sport LDU's have different rotors. The Base rotor has less copper fill than the Sport rotor. The Sport rotor is completely full to the ends of the rotor. The Base rotor has a bit of a "bowl" where there's a void of copper. I think there's a lot of internet lore floating around that says both LDU motors "are the same" and that only the inverter is different but the rotors are definitely different. The LDU stators may or may not be the same. That's much harder to check since the stators are encapsulated.

Thank you sir Even with some mistake you still the greatest Stay safe

@WeberAuto

3 жыл бұрын

Thanks 👍

As you drive down the road it puts the induction motor in 'torque sleep' mode (0 torque). It uses the PM motor only to drive the car. At some point in the application of the accelerator it starts using moth motors. I think torque sleep puts enough power to the induction motor so the output torque is 0 reducing drag and increasing efficiency.

@WeberAuto

3 жыл бұрын

That is what I suspected, thanks for the information

@justinmallaiz4549

3 жыл бұрын

I don't think induction motors have any rolling drag ( besides bearings) .. The permanent magnet motor obviously do

@jamesbruce1183

3 жыл бұрын

@@justinmallaiz4549 I did not invent the term 'Torque Sleep' but read it in a Tesla document. I assume it has a purpose. Perhaps turning the motor ~9 times faster than the axles while the rotor is covered in oil creates/requires enough axle torque to require nulling out.

@wernerfritsch6436

3 жыл бұрын

The use of induction motors as secondary motors has the advantage that they do not generate any voltage (and do not introduce any drag) when they are not used but driven from the wheels. The inverter simply does not feed any current or voltage to the stator in this case and thus introduces no energy losses.

Thanks a lot for your explanations this is really handly

@WeberAuto

3 жыл бұрын

You are welcome!

Thanks for the video.

@WeberAuto

3 жыл бұрын

You are welcome!

AMAZING VIDEO AS ALWAYS... GREAT JOB PROFFESOR... THANK YOU SO MUCH ☝️🤓🤓🤓🤓🤓🤓🤩🤩

@WeberAuto

3 жыл бұрын

Thank you very much

Thanks for the info...👍

@WeberAuto

3 жыл бұрын

You are welcome

Hi - great video. I have same size tires on front and back on my winther 19". Summer is 21" with different sizes as you mention. All original.

easy understanding introduction

@WeberAuto

2 жыл бұрын

Thanks for watching

Great job

So much useful information!

@WeberAuto

3 жыл бұрын

Glad you think so! Thanks for watching

Brilliant and thanks (Mike from Australia)

@WeberAuto

3 жыл бұрын

Thank you!

Nice to see you again sir thank you very much for the after long time thank you for the The video is rich in information god bless you always 🇴🇲

@WeberAuto

3 жыл бұрын

So nice of you

Another amazing video Professor. Thank you for sharing with the world. I have the bluetooth dongle and ScanMyTesla app in my Model Y AWD. It shows that the front motor rarely gets used. Looking at the first log file that I could find it only used power starting at 30% accelerator. I had a Chevrolet Volt prior to the Tesla and during regen braking (in "low" gear as I usually drove) on icy roads the front tires would lose traction and cause some scary situations. After that experience I specifically wanted my next EV to be AWD to keep it from happening. Looking at the Tesla's log data it appears that it still only uses the rear motor for regen almost all of the time even though it has the ability to use the front for regen. The good news is that Tesla's software is smart enough to recognize when the regen is causing an unsafe situation and adjusts as I have never felt tires lose traction during regen braking. Tesla's regen braking on icy roads is more steady than the ABS when you need to use the mechanical brakes.

@WeberAuto

3 жыл бұрын

Excellent information! I just purchased the app and cable for our Model S. I look forward to gathering and sharing some data related to these motors. Thanks for watching

Professor Kelly, just one question: how to you put up with the beating that chair delivers? I bought a Permobile C 350 as it allowed me to go up and down high curbs with no jarring from sitting over the drive wheels.

Model 3 perf ir mostly rear wheel driven in the winter (and thus unmistakably appears less stable on a slippery roads), model s vice-versa - feels primarily front wheel driven. In the wintery conditions ir is very obvious by vesicle behaviour. Thus your hypothesis that the more efficient motor is predominantly used in daily low performances scenarios agrees with winter driving observations. You are spot on.

@WeberAuto

3 жыл бұрын

Thanks for the great information

Great video!

Hi John When you have a spur gear, yes one tooth is engaged but if it is a helix gear it depend on the angle and often the angle is so great that more then one tooth is engaged. Makes it a lot stronger and a lot more silence but the downside is axial pressure. I am almost sure that all gear wheels are ground. In that way you avoid debris from hardening in the oil. About the motor, that is a long long text... anyway the short story is to increase the current you must increase the voltages however that can't just be done, you have to take the frequency in to consideration. Here we are talking about Volt/Hz relationship and for the induction motor you also have the slip between the stator and rotor to account for, that is normal done by IR Compensation. anyway now it is starting to be a long story. I highly appreciate your videos. 🙏🙏🙏

@WeberAuto

3 жыл бұрын

Thanks for the information. I was wrong about the gear tooth on the helical gears.

@A2an

3 жыл бұрын

​@@WeberAuto Well I have made hobbing machines for many yers. I just finished producing a 9 Ton spur gear muddle 22 for a prototype win turbine so gears and AM and PM motor including servo drive is my speciality and electronic as well. Anyway I am sure that you already know. It is difficult to create a long fine detailed video on a complex matter such as this, even though you look at the video through more than once, small mistake will occur. I am astound over the brilliant videos you make. Respect and 🙏

@WeberAuto

3 жыл бұрын

@@A2an Thank you very much

Heads up, my 2022 model long range Model S has two permanent magnet motors, which produce 670hp combined. The performance model s top speed is 200 mph, the long range Model S is 149mph. Thank you kindly for your videos.

Another Great video

@WeberAuto

3 жыл бұрын

I appreciate that

Great content

Excellence work!

@WeberAuto

11 ай бұрын

Thank you

Permanent magnet motors are very efficient when operated close to max torque, but not so much on partial loads. That happens because the rotor magnetic field can't be reduced at will. Induction motors are different, the rotor field can be reduced or augmented at will, modifying the slip frequency. That means at small loads, and induction motor correctly controlled can be more efficient than a PM one. Same applies to externally excited motors, like the Renault Zoe one.

@WeberAuto

3 жыл бұрын

Great information, thank you!

U R the best!! tanks from Argentina

@WeberAuto

3 жыл бұрын

Thanks for watching

Have you already done the Model 3 front/rear motors? I looked, but couldn't find videos on those. Can't wait for them!!!!

@WeberAuto

3 жыл бұрын

Coming soon!

@oisiaa

3 жыл бұрын

@@WeberAuto Can't wait! Videos should be a hit. There are way more of those cars out there with curious owners.

an excellent trainer

@WeberAuto

2 жыл бұрын

Thank you!

Great Video. Thanks.

@WeberAuto

3 жыл бұрын

Thank you

Ive watched a lot of your videos to learn about EV tech. If it helps me get a job in the future then I will definitely come back to make a donation. This content is worth much more than Netflix or Disney.

Another great video from professor! Thank you! I live in Russia, where electric cars not considered a popular transport. But I try to understand this direction because this is the future of individual transport.

@WeberAuto

3 жыл бұрын

Thank you and best wishes

@asherdie

3 жыл бұрын

It is the future, because it being forced by the aristocracy and swallowed by dupes like you.

@chenus6544

3 жыл бұрын

@@asherdie some days ago i'm played with engine analyzer software. And notice than thermal efficiency of classic internal combustion engine is about 36-38 percent. Electric vehicle has two time better efficiency. That's because it is future for city transport. Sorry for my english.

@asherdie

3 жыл бұрын

@@chenus6544 not everyone lives in the city. But the aristocracy has a plan to force us into cities. Where is your efficiency measured at? Just the vehicle? Are you figuring generation and transmission of power and it's losses, storage of power and it's inefficiencies, infrastructure environmental and monetary cost, mining for resources to fuel power generation, mining for raw materials for the manufactue of batteries and then the disposal of batteries? Internal combustion engine can be much more efficient but pollution controls hinder it. VW proved it to the world. Limited range and long recharge times make electric vehicles a reasonable choice for those who choose to live like rats in a city, but are a noose around the neck of those who dont.

@Dextermorga

3 жыл бұрын

@@asherdie why don't you do us and yourself favor a keep these mental farts for yourself? Nobody in here is interested.

From the owner's manual of the 2020 Model S and Model 3 for the EU market, I can see that there are 4 versions of the PMa-SynRM: The first one is a 239 kW and 420 Nm motor with 350 V operating voltage, used in the single motor RWD Model 3 The second one is a 203 kW 330 Nm with 335 V operating voltage, used in the base dual motor AWD Model 3 The third one is a 219 kW 420 Nm with 320 V operating voltage, used in the Performance version of the Model 3 AWD The fourth and final one is a 205 kW 420 Nm with 320 V operating voltage, used in the entire Model S lineup from the base model to the Performance model (P100D)

@WeberAuto

3 жыл бұрын

Great information! Thanks for watching

@angelopea8334

3 жыл бұрын

@@WeberAuto thank you too for this video, you always bring great content!

Thank you!!!

@WeberAuto

3 жыл бұрын

You're welcome!

Beautiful

@WeberAuto

3 жыл бұрын

Thank you

I suspect you are correct about the perm motors in the Tesla cars.Great series :)

@WeberAuto

3 жыл бұрын

Thank you and Thanks for watching

Another awesome video

@WeberAuto

3 жыл бұрын

Glad you enjoyed it

Awesome channel. Thank you

@WeberAuto

3 жыл бұрын

Thank you

Thanks professor Kelly ..

@WeberAuto

3 жыл бұрын

You are welcome!