Understanding the Tesla Model S Performance Motor

Join me for a deep dive into the details of the 18,000 RPM performance rear motor and drive unit from a 2015-2016 Tesla Model S P90D. This drive unit is similar to the one used in the 2017-2020 P100D. The video is divided into four sections showing: 1. The motor and gears. 2. The high-performance bearings. 3. The lubrication system. and 4. The cooling system.
CORRECTIONS:
Thank you to everyone for catching my errors. There are always errors ;)
1. The Nissan Leaf ring gear is held on with 8 bolts, not 6.
2. The fluid in this drive unit is Dexron 6 transmission fluid.
3. Induction motor rotors do not have poles, just the stator. The 60 slot stator has four poles.
4. Silicon Nitride is a ceramic material.
TIMELINE:
0:00 Start
0:10 Introduction
1:35 Gearbox housing
2:10 Video Section 1 - Gears and Motor Rotor
2:45 The giant differential ring gear with 16-bolts!
4:20 The giant differential case bearings
4:50 The differential case speed at 250 km/h (155 mph) = 1841 RPM
5:15 MUST SEE Comparing the Tesla 213mm x 50mm. ring gear with 78 teeth (Factors 2, 3, 13) to a Chevrolet Bolt EV and Nissan Leaf EV
5:40 A Chevrolet Bolt EV differential 198mm x 34.3mm ring gear with 12-bolts.
6:10 A Nissan Leaf EV differential 200mm x 32mm ring gear with 8-bolts!
7:30 The Counter Shaft (Jack Shaft) with 25 (Factors 5, 5) pinion gear teeth. 78/25 = 3.12:1 Gear ratio from countershaft to the differential case
8:50 The countershaft speed at 250 km/h (155 mph) = 5743 RPM
9:30 The motor shaft with 25 teeth drives 78 teeth on the countershaft for another gear reduction of 78/25 = 3.12:1
10:08 The motor shaft speed at 250 km/h (155 mph) = 17,919 RPM
11:20 See all three gears in the reduction gearbox with an overall gear reduction of (78/25) x (78/25) = 9.7344:1
12:05 MUST SEE The AC Induction Motor Rotor with 74 bars
13:25 Motor specifications for power, torque, and gear ratio
15:00 MUST SEE Ceramic Bearings (Silicon Nitride) on the rotor from the SKF Group (skf.com)
16:22 MUST SEE Close up view of silicon nitride bearing
18:20 The motor rotor speed sensor reluctor wheel (tone ring)
19:22 Must SEE The rotor installed on the drive gear and the functioning gearbox
20:18 Video Section 2 - Specialized Bearings
21:21 The 60 slot four-pole stator and housing
23:05 The oil pump and how it is overdriven by the differential ring gear 23/78 = 0.2948:1 gear ratio (3.339 times faster than the ring gear)
23:55 MUST SEE The function of the oil pump (it may surprise you)
26:27 Motor shaft (Input Shaft) bearing reference speed and limiting speeds
27:30 How to run bearings at higher speeds than their limiting speeds
29:54 Video Section 3 - Lubrication
30:25 Drain and fill plug locations
30:50 Gearbox vent and inverter vents
31:05 Sport model label
31:39 MUST SEE Four different sealed areas in the drive unit
32:46 Video Section 4 - Cooling System
33:30 MUST SEE The coolant inlet port and the two paths coolant takes
33:53 Up for rotor cooling and gearbox cooling
35:03 Down for stator and inverter cooling
36:05 Coolant from the rotor moves to the gearbox heat exchanger and the outlet port
37:25 Stator temperature sensors
38:10 Coolant from the stator to the inverter coolant passages
38:28 Stator coolant temperature sensor
38:35 MUST SEE Insulated-Gate Bi-Polar Transistor (IGBT) module coolant passages and flow through gearbox passages
40:34 Inverter coolant outlet temperature sensor
40:45 The gearbox oil-to-coolant heat exchanger
41:38 Coolant outlet port to coolant pump and onboard charger module under the back seat.
41:55 Drive unit cooling system summary
43:04 IGBT inverter modules installed and inverter cover
43:40 High voltage battery cable connections and low voltage connections at the inverter
44:35 Video summary
ABOUT US
Weber State University (WSU) Davis Campus - Automotive Technology Department - Advanced Vehicles Lab. A technical description and demonstration of the Tesla P90D Rear Drive Unit (RDU). We teach current vehicle technologies to our automotive students at Weber State University and online. For more information visit: www.weber.edu/automotive
This video was created and edited by Professor John D. Kelly at WSU. For a full biography, see www.weber.edu/automotive/J_Kel...
Visit my other youtube channel / vibratesoftware to see the amazing NVH app for vibration diagnosis!
ADDITIONAL TRAINING FOR YOU
Join us for hybrid and electric vehicle training with two online courses and in a 5-day on-campus boot camp with Professor John D. Kelly. See www.weber.edu/evtraining
DONATE TO OUR DEPARTMENT
Please consider a donation to the Department of Automotive Technology at Weber State University here: advancement.weber.edu/Automotive

[@romang9634]

2 hours after release, 2000 views, 270 thumbs up and 0 thumbs down. This tells something about the quality of the material. Thank you professor.

[@WeberAuto]

Thank you very much!

[@conelval]

Unbelievable how can someone give thumbs down to such a great and well-explained video...

[@WeberAuto]

@@conelval Thank you

[@trumpetmaris]

@@conelval seriously, can't even imagine a person that would thumbs down this video! perhaps they feel unworthy of the huge amount of information that wouldn't fit in their small brain... lol.

[@jpdemer5]

@@trumpetmaris Mindless KZbin trolls find every video eventually. I think they get their jollies by being the first to downvote something, and they certainly don't take the time to watch.

[@WeberAuto]

CORRECTIONS: 1. The Nissan Leaf ring gear is held on with 8 bolts. Apparently, I can not count today! Thank you to everyone for catching my error. There are always errors ;) 2. To my great surprise, I was wrong about the fluid in this drive unit, it actually is Dexron 6 transmission fluid! 3. Tesla states that this is a four-pole motor. Induction motor rotors do not have poles, just the stator. The stator has four poles. Thank you to everyone for catching my error. 4. Silicon Nitride is a ceramic material. I was wrong to say the rotors bearing balls were not ceramic. Thank you to everyone for catching my error.

[@haulngrassracing]

Hey professor John, just got a Chrysler Pacifica Hybrid. I’ve seen your video on the gear reduction gearbox but are you planning on doing a break down on the hybrid battery? Thanks for your videos and as alway another great video and explanation.

[@WeberAuto]

@@haulngrassracing Thank you, I would like to if I could get my hands on one.

[@haulngrassracing]

@@WeberAuto Well I would loan you our 2018 but I don’t think my wife would be so understanding 🤣

[@WeberAuto]

@@haulngrassracing LOL! Probably not

[@lorrinbarth1969]

You're like me, one, two, three, many.

[@drvr1227]

At 9 yrs old I took apart my Grampa's radio cause I wanted to know what made it work. I'm 64 now and still want to know what's inside. Thank you sir for showing me what's inside and how it works. You're the best teacher I wish I'd had.

[@WeberAuto]

Thank you very much

[@nmpeter487]

I assume you still have your old radio shack home tube tester someplace..I do...

[@SemihFatihAdem]

Omg we are so lucky to hear these from a professor instead of a youtuber. Thanks for quality content

[@narrowgoat-scout]

Professor vibes are always the best. I really began learning at age 15 when I met my first carpentry tutor. Thanks Peter Fletcher 👍

[@sandyt4343]

For years I have wondered what the makeup of the Tesla drive system was built like. I doubt that I have ever seen a more concisely explained explanation of any machine. Done with no showy exaggeration or hype, just as good as anyone could hope for. Thank you for your efforts

[@WeberAuto]

Thank you very much

[@kidcasco1966]

As an engineer, can't get enough. A fantastic and inspirational mechanical engineering talk for not only seasoned but new engineers. Your experience and humility are inspiring. Thank you for taking the time to share your knowledge and perspective. Much love.

[@WeberAuto]

Glad you enjoyed it

[@rogervize]

Also of interest to the general public.. not just engineers.

[@gentelfix8643]

Love it.please continue doing dis

[@JohnHlavaty]

A fantastic presentation and an example of excellent teaching. 'm neither a mechanic nor an engineer. I'm just a city guy who years ago traded a small second mortgage for a classic Mercedes 190 with a cracked head and in need of a restoration. After learning all I could about aluminum motors and restorations, I restored the 190 and sold it for a profit. My reason for telling my story was to compliment the professor on his thorough and coherent presentation on the Tesler motor and differential. Although my story about the 190 did not detail the restoration (

[@akradiabra]

This (comment above) so much from an appreciative retired UK electrical engineer.

[@ramzyzoom6674]

I do not speak fluent English. But I was able to understand the speech ... by using clear sentences and words and the sequence of explanations in a simple logical way. Thank you...

[@WeberAuto]

Thank you very much

[@ehhhhhhhhhh]

I think my favorite part was the explanation of the cooling system. It blows my mind that engineers can manage to get coolant to the right places in the correct amounts such that the system stays stable for so many years of operation. Thanks so much!

[@quentinvilli2207]

I'm in a wheelchair too and I love cars. I still was surprised when i saw that you were moving on wheels. We shouldn't stand only to stand and judge the wheelchair. thanks for showing everybody that we are still here and pushing hard to do what we like. You are an example, thank you.

[@WeberAuto]

Thank you very much! Sometimes I forget I am in a wheelchair. You are correct, people in wheelchairs can be very productive and contributing members of society. Thanks for watching

[@lelandengland2526]

@@WeberAutog

[@Mercmad]

EV chair coming soon.... (18000 RPM..!)

[@JP-rf7px]

@@Mercmad Yes, imagine what Tesla could build to drive a wheelchair! Would need a helmet as you went down the interstate to keep bugs out of teeth!

[@boostjunkie2320]

my grand mother had one leg. She was a little league baseball coach in th worst side of time. she worked as a 911 operator and also went sky diving with one leg. she was inspirational to me. how she never let being handicapped hold her back from doing what she wanted to do.She had a modified van that allowed her to drive

[@mickeyj1948]

I am a 73 year old retired mechanic with above average knowledge of auto electrics and I really enjoyed the professor's detailed explanation of the drive unit. I have subscribed to the site and look forward to more.

[@WeberAuto]

Wow, thanks!

[@motorv8N]

First rate lecture sir! Although I’m not a professional technician I get a huge amount of pleasure watching and learning from your videos. We recently bought an EV (Mini SE) and I’m itching to take it apart. Sadly my family appears less than enthusiastic about the idea so for now I’ll need to live the dream by watching all your EV drive line tear downs.

[@SquillyMon]

So what you're saying is... DO-NOT physically damage that housing! Holy Smokes I had no clue of the level of simplicity and complexity going on in that assembly. I suspected as much but this blew my mind. Some adventurous engineering right there!!

[@billmccroskey4595]

I enjoy the fact the narrator has disassembled (before reassembling) an actual component with explanations that can be understood by a lay person. Great learning tool by teaching that way.

[@WeberAuto]

Thank you very much

[@sonajuma]

This is simply the best of KZbin, demystifying and inspiring. Added to superb content and presentation, audience centred post-production links for easy navigation and reference. Thank you for creating the gold standard for others to follow.

[@WeberAuto]

Thank you so much 😀

[@arts8302]

@@WeberAuto you say it is dry in there but do we really know whether they put some exotic gas in? I take it the atmosphere gets in through the bearings every time it cools down? I think dry is a matter of degree. Yes the atmosphere is a vapor. It's not clear if he is super drying air by taking it from the evaporative coil area for the cooling system. In terms of the camper mode and the heat pump history this video is helpful to explain that even electric cars in operation produce significant heat and that heat can be reused for passenger comfort as you say is rumored.

[@WeberAuto]

@@arts8302 I do not know about an exotic gas being in there, but it is possible.

[@vkvedam]

Excellent, informative, engaging. You are the sort of teacher every mechanical engineer like myself crave for, take a bow Prof John!

[@WeberAuto]

Thank you very much

[@carstenmller1105]

This is the best walkthrough of a Tesla motor and gear Ever. I’m impressed of the cooling system. Great work. I’m looking forward to see your next walkthrough.

[@shellderp]

didn't think I'd watch a 45 minute video on this, but it was fascinating!

[@WeberAuto]

Thanks for watching. I hear that quite often about my very long videos

[@DCuzick]

I wanted to mention that, as a potter, I have uses nitride bonded silicon carbide kiln shelves to fire my pottery for years now. I believe that they are made of the same material as the bearings you mention. I fire my kilns to 2,400°F, though the shelves are only 3/8” thick, 18” X 18”, supported only at the four corners, and holding as much as 100 lb, they do not warp or distort and they are so dense that a molten glaze drip, when cooled, will not stick to the surface of the shelf. Incredible material! Thank you for your very informative and well presented video.

[@WeberAuto]

Awesome information, thank you!

[@aturogs1954]

Very much like a comprehensive crash course. Very clear explanations that I learned so much in just under an hour watching. Thanks.

[@tonybryan5181]

Thank you sir for a most informative, detailed description of the Tesla motor and drive train. A really fascinating dive into the inner workings. I especially appreciate your candidness on what is not known for sure, Thank you, my friend.

[@1959sdl]

Thank you, Professor, I wish all my educators were as well-spoken as you. I would not have nodded off in the lecture hall as many times. As an Aviation Maintenance tech in the turbine engine department for 32 years, I say Bravo.

[@WeberAuto]

Thank you very much!

[@williamstewart3469]

Understanding engineering concepts is quite easy for me, though understanding how Professor John Kelly keeps producing such awesome content on the other hand is much harder to grasp. This man was born to teach! From a fan in Australia, another bloody good effort mate.

[@WeberAuto]

Thank you very much!

[@MJ-iy4fb]

Are you the guy who does the Thompson CVJ video? That's a great piece of mechanical work.

[@stelthirdeyeproductions5819]

Amazing! So much high tech in such a 'simple' design, driving components to extreme conditions. Such a 'well' balanced system. Looking forward to watch the power electronics video tonight. Brilliant explanation (as usual). A 'perfect in every way' lecture! Respect!

[@williamcampbell9859]

inverted commas are not used for emphasis in english. Stop using them in that manner.

[@Nate_Vee]

You are a great instructor with clearer descriptions and high-definition explanations. You make me want to become a mechanic. Thank you

[@Battlefresh]

It blows my mind that a single AC motor of this size can put out over 500hp. That's just amazing.

[@WeberAuto]

I thought the same thing

[@tachikaze222]

@@WeberAuto I'm sure my first ride in a trimotor next year is going to be a religious experience ; )

[@WeberAuto]

@@tachikaze222 That sounds like a lot of fun!

[@blogengeezer4507]

Power Grid reserves, the Root source of the tremendous torque/power sequestered inside the storage batteries, are enormous, efficient energy potentials.. if not constrained, restricted, overly regulated.. Steam power also capable of immense initial torque from relatively small piston, remarkable at time of Industrial Revolution ;}

[@thoritsu]

Imagine if it were a PM motor, which would be about one-half the size.

[@Maltanx]

I've been waiting for this video for a while, all the others just show the transmission but only you have the knowledge to teach us how it really works and show us all the little details like those bearings and the cooling system. Thank you Professor!

[@WeberAuto]

Glad you liked it! Thank you

[@razony]

I'm pretty much a DA and don't even own a car. I find this guy so interesting at describing all this with his less than zero eggo. Refreshing and I learned something today! Loved when he smurked a bit, when he said "Ceramic Balls..."then got all serious. He thought about what he said. Love it!

[@WeberAuto]

Thanks for watching

[@thatlowesguy5544]

You are an amazing teacher. I have a model S P 85 + and looking at upgrading the drive unit after experiencing a whining sound. Feel way more comfortable after watching your video. Thanks!

[@chenus6544]

this time you, professor, are laughing and looking very pleased. Nice to see you more emotional in a good mood. your subscriber from Russian Siberia.

[@WeberAuto]

It was a lot of fun. Thank you

[@blogengeezer4507]

'Bald and Bankrupt', speaking fluent Russian, tours former USSR, searching for Anything 'Soviet'. Periodically depicts 'junked' ..[due to lack of factory support],.. luxury vehicles. Vehicles that innovative Russians have acquired, Installed Diesel engines, conventional drive trains. Brilliant concept, creative individuals, to Really render these complex vehicles ... .... Sustainable ;}

[@chenus6544]

@@blogengeezer4507 Interesting. But I want Russia, from a colorful third world country like African countries, to turn into a boring but developed country like the United States.

[@williamstewart3469]

Understanding the high performance teaching skills of the big Professor is a video I'd like to see! Another bloody good video Prof.

[@WeberAuto]

Thank you very much

[@Joj_knows_jack]

Incredible work, professor! Making curiosity visible, watch and learn from a master. Production quality and clarity helps immensely, well done team!

[@WeberAuto]

Thank you very much

[@home-inspections]

Nicely done professor Kelly. Your comprehensive teachings complement the superb design of this drive unit precisely. Thank you, I have subscribed with enthusiasm.

[@Mixter81]

This is one of the best videos I've seen of explaining the Tesla S series engine and transmission details. I'm studying to become an electric/hybrid car mechanic. Thank you so much for showing me all this.

[@WeberAuto]

You are very welcome

[@blogengeezer4507]

Full electric vehicles weakened/failed across Texas freeze, as the overloaded Grid failed., Hybrids had no such problems ;}

[@hkelly1623]

As long as the gasoline stations had electricity to pump the gas out of underground tanks. If a station has an emergency gasoline fueled generator it can operate. The credit card system may not work, though, so they might be cash only.

[@uploadJ]

@@blogengeezer4507 A once in 20 to 30 year event; No one goes anywhere in those conditions, so?

[@MrPatdeeee]

Yet another "Gem" from Weber college; through one of THE greatest professors (John Kelly) on this planet; I do believe. For I can truly say without hesitation that of all the teachers, professors and instructors throughout my life (turn 89 on April 5th); that John is THE greatest. He is a blessing for sure. Thank you kind Sir. Again, If one can't learn under John, they simply can NOT learn, period IMHO.

[@WeberAuto]

Thank you very much! Best wishes

[@kevinhansen7576]

I have wound 3 phase ac motors for a good part of the last twenty years. A 500hp motor typically is around the size of a refrigerator and a 4 pole motor is typically 18 hundred rpm. I am absolutely blown away. Thank you for this video. Very impressive

[@Hamassucks193]

Maybe one of the best videos I have seen. Attention to detail not only in the TESLA but also by the presenter, good job sir.

[@WeberAuto]

Glad you liked it! Thank you for watching

[@successfulengineer]

The hits just keep coming, another fantastic video. Pretty much the only channel on YT where I start a video and enjoy every minute right till the end.

[@WeberAuto]

Glad you like them!

[@JagiChan]

Wow, that is some serious engineering; and you did a fantastic job in explaining the whole drive train and the various components. Appreciate the amount of time and effort you dedicated to making such a great video.

[@WeberAuto]

Thank you very much

[@credenceobliquy9604]

Thank you so much Professor. This is an excellent exposition of the engineering. I've been intrigued by these cars - thank you - fascinating. Now I want to know more about the IGBTs. You are so clear and interesting.

[@djosbun]

One of the members of the diag.net recommended this channel and I am very thankful that they did! I've watched three of your videos and am now a subscriber! Thank you for making these superb videos!

[@WeberAuto]

Awesome! Thank you!

[@marcstumpe1623]

Dear Professor Kelly, thank you for this impressive and very well explanatory video. As an electronics engineer who works in the field of e-mobility, I can confirm that Tesla has done an excellent job here. (That is one of the reasons why I have been driving a Model 3 with great pleasure for almost 2 years).

[@WeberAuto]

Thank you very much

[@telquad1953]

As always, the detailed explanations and the physical device demonstrations. I always feel that my brain has been taken to a good place with your videos, Professor. Thanks so much.

[@WeberAuto]

Thank you, you are most welcome

[@tonyc7352]

You are a great teacher. A big reason why is you are is your genuine enthusiasm for the subject. It doesn't matter how much academic training a teacher has, there is no substitute for love of the subject. Not to say academic training isn't very important and useful, it is.

[@jannelandia]

Thank you for these nice videos! One mention from Finland, coolant is also used to spread the heat. Probably in this case from the rotor to the oil to ensure lubrication in freezing conditions. And of course for cooling :)

[@agentbertram4769]

Superb video John. I haven't enjoyed a technical video so much for a long time. Your depth of engineering knowledge is impressive and your ability to get the message over in an understandable way is simply brilliant. Well done sir!

[@WeberAuto]

Thank you very much!

[@iandamon4968]

Love the thoroughness of the explanation. Also love the Mr Peabody reference to the Wayback Machine...

[@WeberAuto]

Thank you!

[@waltermeerschaert]

This is the best description of the motor I have seen on YT. I did watch at 1.25x.

[@Joe__Tech]

„Feuer von einem Auto“?🤔 Sehr merkwürdiges Maschinendeutsch😄 Totale Phantasieerfindung.

[@st3althyone]

Amazing, just amazing that you’re able to follow all that tubing, ducting and break it down for the layman to understand. These Tesla engineers truly are squeezing the most HP/Torque they can out of these things and they’re still not done. Thank you for taking the time to do all these work to entertain us with your wonderful content.

[@WeberAuto]

Glad you enjoyed it! Thanks for watching

[@wyliebob6105]

These new electric autos are quite different from the combustion that I cut my teeth on 60+ years ago naturally but bearings, cooling & lubing haven't changed except for higher temps. Amazing video.

[@donaldfischer]

I'm a few days away from getting my long awaited Mach-E. This and John's video on the Bolt were very vey informative. In fact the Bolt video pushed me into buying the Mach-E. I hope he does a teardown of the Mach-E someday. Keep 'em coming John.

[@WeberAuto]

I hope to get one here at our school someday. Thanks for watching

[@robertbennett9949]

Thank you. This is by far the best video I have seen on the subject(s). The graphics are just amazing. Truly professional.

[@coolhab1]

Amazing job explaining the mechanical details behind such an intriguing product. Thank you, Sir!

[@randallhash9283]

I can appreciate all the design and engineering that went into this EV system...This is such a wonderful instructional video...I own a 2020 Model S and this is such a delight to understand the workings of the systems...Also, it is enlightening to see all the positive comments...Keep up the good work..

[@WeberAuto]

Thank you very much

[@32bits-of-a-bus59]

Also, I'd like to thank you for the wonderful content you are creating. I've learned so much about cars from your videos! Keep making new episodes, please.

[@WeberAuto]

Thanks, many more to come!

[@moose1485]

Thanks for the great video!! I purchased my P90DL a month ago and this is the only video I could find that gives me a full breakdown.

[@ngeltz]

I watched your presentation earlier this year after you posted this video. I just watched it a second time, because there's a good deal of interesting information to consume and I was unable to consume it all during my first viewing. Excellent presentation and thank you so much.

[@kwizikle65]

Wow, I was hooked. Thanks so much for explaining - I cannot believe the speeds of those bearings... thats getting close to turbine speeds... wow! Really well presented. thanks.

[@WeberAuto]

Glad you enjoyed it!

[@robinmyman]

You have obviously put in a lot of work putting this very clear and thorough presentation together. I’m an Accountant and only a 50 year DIY understanding of petrol engines. Well done and thank you. Swansea, UK.

[@WeberAuto]

Thank you very much!

[@rogerdc7279]

Thank you very much Professor, for your knowlejable and clear explanations of this very interesting subject. The main thing that I got from your explanations is the very high end engineering and quality of the materials of the Tesla motors.

[@scottduede8134]

This is useful in the extreme. Thank you for creating this explanation of the parts that make electric cars go!

[@MrDjconquest]

This was a very well put together video, thanks WeberAuto. Your knowledge base is extremely appreciated!!

[@WeberAuto]

Glad it was helpful!

[@redsquirrelftw]

Wow that was an awesome video. Probably the most detailed teardown of a Tesla motor I've found so far. Cool to see that they use an induction motor with no magnets, I always figured it was a BLDC.

[@WeberAuto]

Thanks for watching

[@mredgar325]

Thank you for sharing all this info that must have taken you many hours to compile. You and others like you make KZbin a priceless source of information.

[@amundsen575]

Wow , excellent break down and analysis, SKF is a world leader in bearing technology, and the engineering and sophisticated machining required in this 500Hp power train is quit impressive to say the least. Fantastic explanation.

[@WeberAuto]

Thank you very much

[@jonsnell4751]

You are a very clever man Prof. Thank you for sharing your knowledge, I find it very interesting. Keep safe and best regards from the UK.

[@WeberAuto]

Thanks, you too!

[@briancnc]

Always amazed how such small motors can produce so much output power. Work of art!

[@meabob]

I been in the auto repair business for 40 years. Since there's no Tesla service info publicly available (as of last week in Alldata and ProDemand), I'll likely never get a chance to repair a Tesla because I plan on retiring in a couple years. We couldn't even get brake pads and rotors for a Model S that came in last week with a brake squeal. The brake system looks very much like any other disc brake system but no parts stores near us carried parts nor could they get them. The closest Tesla dealer is over 2 hours away. I wanted to drop the under shield to get a look at the motor/transaxle setup but my manager said not to just in case something went wrong. But I'll keep looking because I just want to see how they work. So far this video has been the most informative on their drivetrain setup. Thank you. Side note: To those saying electric cars are going to kill the auto service business: This car was a 2016 Model S with 38k miles and it already had worn brakes and the tires were getting close to the wear bars. The suspension system looked very much like the suspensions on our beloved fossil fuel vehicles. Assuming aftermarket parts do become available or a dealer is near you, I don't think you'll have to worry about losing work except for oil changes and engine air filters.

[@WeberAuto]

Great comments, I agree. Thanks for watching

[@tonys8243]

The stuff you do is a one of kind on the internet... thanks so much.

[@WeberAuto]

Thank you

[@elcheapo5302]

Very interesting, Professor. Thank you for sharing. I had no idea the cooling system was so complicated. Looking forward to the next three parts!

[@WeberAuto]

I was also surprised. Thanks

[@krishna7862]

That was one hell of a cooling system design. It is excellent. Thank you professor for such a wonderful presentation and explanation.

[@Kloppin4H0rses]

Why Indian Flag?

[@balkanmuscle]

As an Electrical Engineer I enjoyed your video a lot! Wonderful video :)

[@csilver9625]

Stoked to see the quality content Weber State is putting out regarding EVs. It seems as if you are leading the charge in quality training in the nation! Every time I watch these videos, it makes me want to run up to campus and check it out in person. I’m just afraid I would quit my job and enroll back in school again (which may actually be a good great thing)

[@donaldmiranda6224]

I am not a mechanic just curiosity kicked in :) ... the way he explains was great..your students are lucky to have you as their mentor...sharing knowledge for free...keep it up professor! ..take care always and Godbless....made me a subscriber now!

[@WeberAuto]

So nice of you. Thanks for watching

[@2029shc]

Fascinating, and thanks very much. I cut my teeth as an engineering apprentice at Mawdsleys at Dursley in Gloucestershire in the late 1950s, who built a wide variety of motors and generators. Many were for Ward Leonard schemes, surely the pioneer (and then only possible) variable speed electrical drive. Insulating materials were then confined to impregnated paper, cotton tape and native mica! So I find myself re-learning (and trying to remember) things that I knew about, now at age 88! I now run a Renault EV!

[@dennisstofan8469]

Thank you for the very informative 45min. video. I most certainly was mesmerized for the entire video. Being a Class B machinest from the great industrial city of Cleveland, Ohio, I can appreciate the engineering involved here. I was impressed with the clean and order of the shop where the video was recorded. Keep up the good work.

[@WeberAuto]

Glad you enjoyed it! Thanks for watching

[@jagsidhu4559]

Such a dedication to teach, and so well done. Thank you.

[@WeberAuto]

Thank you very much

[@edgarkuylen276]

Amazing! Thank you for bringing this major bit of information to us gas guzzler gate watchers. Your efforts are deeply appreciated.

[@WeberAuto]

Thank you very much!

[@lionelbass1505]

Extremely well done. Concise, clear and also video steady.

[@2wagondragon]

Fantastic video. So well explained. I have to say though, that when you talked about a reluctor ring, I immediately thought of the turbo encabulator.

[@WeberAuto]

LOL! Thanks for watching

[@jublywubly]

This video is fantastic. I've learned a mountain from you. Thank you for making such a brilliant and interesting video!

[@WeberAuto]

Glad you enjoyed it!

[@vaughnbay]

Some people are just naturals.....you're one of them John. Great Job!

[@WeberAuto]

Thank you very much

[@macelius]

Really appreciate this wealth of information available at no cost.

[@joedmac78]

That is really cool. It's nice to see something overbuilt and well thought out

[@WeberAuto]

Thanks for watching

[@benoitpaccaud1590]

Amazing performance and explanation ! How can you be so clear and specific! I am also teacher in a mechanic college in France and take the curve of EV with my student is not obvious, so your explanations are welcome and I hope they could teach me to be more accurate in my explanation

[@salvadorw.empent2778]

Great channel professor very inspiring ... it's amazing the size to power ratio of these Tesla electric motors it's hard to imagine what the future holds for further reduction of size and weight to power output! 💪

[@WeberAuto]

Thanks for watching!

[@Jamestfarrell]

You remind me of the two top-notch auto shop instructors I had the pleasure of experiencing-in 1963 and 1964, San Leandro, California, Mr. Blanchard and Mr. Redeker at Pacific High.

[@WeberAuto]

Thank you very much

[@MiguelRodriguez-nt5eq]

I love Professor Kelly's presentations they are Golden Educational videos. The information in them are the best free education videos on KZbin for EV technology.

[@compu85]

According to the documentation I found, and looking in the parts catalog, the oil for the Model S large rear drive unit is "AUTOMATIC TRANSMISSION FLUID DEXRON VI - SYNTHETIC 212B (1031106- 00-A) - 3" The model S front drive unit is different, "LUBRICANT, MOBIL SHC 629 (1119780-00-A) - 1 LITRE - 2". So it really is just Dex6!

[@WeberAuto]

You are absolutely correct, I was wrong about that. Thank you!

[@gabeh7373]

Do you by chance know if it's Dexron 6 for the Model 3 Performance F&R motors?

[@blogengeezer4507]

-Same used in 4x4 Transfer case GMs?

[@WeberAuto]

@@gabeh7373 It is not

[@WeberAuto]

@@blogengeezer4507 Yes

[@Gammaduster]

Thank you Pr. Kelly, looking forward to the high power electronics teardown

[@WeberAuto]

Coming soon! Thank you

[@hubbcapp2109]

That was absolutely amazing and helpful, especially being that I have the 2016 P90DL. I would like to say I really appreciate your candor as well as the way you simplify/dummy it down for us backyard/gearhead mechanic types. You should do a few more similar videos on basic D.I.Y. maintenance for the model S Tesla. That being said thank you Sir, you are awesome.

[@zioo3117]

This is an amazing video to breakdown the motor. Creating these parts and pieces clearly involves a lot of special materials. It is no wonder that these motors together constitute the majority of the expense of the car. The motors are very efficient. Thus it is the battery which is left for the primary improvement of the vehicle. Other manufacturers will have a hard time catching this type of technology. This is a really special motor and technology and helps the layperson understand what an electric car is all about. The sealing off arrangement is also very important. Testla got that done as well.

[@WeberAuto]

Thank you very much

[@265chemic]

Reminds me of going to technical college for automotive, I had great teachers. Thanks Weber Auto!!!

[@WeberAuto]

Thank you

[@danielsawinski7067]

Thank you. This is an interesting and professional webinar. Keep going, and good luck.

[@Bgkim1113]

I love to watch Prof. Kelly's instructive lecture video. thank you million tons. be healthy and keep teaching me. even you are the other side of hemisphere of earth.

[@WeberAuto]

Thanks for watching

[@zapeirsky]

I AM HUMBLED AT THE ENGINEERING THAT WENT INTO THIS DESIGN……….GREAT TALK AND GREAT JOB PROFESSOR……..

[@peterloveittloveitt3974]

Great video. Often you mention bearings and lube requirements. This made me think of my aviation turbine engine background. 17K RPM is about idle speed for a compressor on many turbines while some ( Allison T-63) turn at 60K + RPM. Being so I would venture that many of the Tesla items might have a Aviation heritage. Turbine engine oils also would be designed for the heat and RPM .

[@carlubambi5541]

I'm a master electrician, I have seen many ac motors and DC motors with massive bearings, they are hooked up to drives because the ammout of torque the motors can generate on start up is insane, equipment can be destroyed if they are started across the line. Electric motors can be smaller but have massive amount of torque and power for their size

[@omkarahire9101]

Thanks A lot for the video with such a detailed explanation... can't imagine the hardwork and patience required to pull this off😅... Would like to see much more... Great fan🙌🏼🙌🏼

[@thewitchertales]

what a great educational and well made video with tons of detail... great job man!

[@joebond5012]

Great video, clearly explaining how the motor works. Thank you very much for an enjoyable 46 minutes.

[@WeberAuto]

Glad you enjoyed it