Thank You.

Can't wait for tesla to start using exro's coil driver!!! And get rid of all the needed gears!!

Thanks for watching

This is gold. Thank you.

You're very welcome!

I`m getting dizzy.

Thanks for watching

If you appreciate 18k RPM rating of the electric motor, please take a high performance motorcycle engine apart. It is in the same ballpark of rotational speeds with more and more complex moving parts.

That sounds like some cool technology

This is simply the best of YouTube, 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.

Thank you so much 😀

Absolutely First Class. Thank You.

Glad you enjoyed it!

Very nice job!! You are so skilled in your teaching abilities. Very competent communication skills !! Kudos !!

Thank you so much 😀

9.4 ratio is plenty close enough for this convo. (WELL DONE got my sub)

Thank you!

Makes me want a Tesla even more!

Thanks for watching

I am a ceramic engineer BS from UDub and SiN is a ceramic and from what I have worked with is black in color. Si3N4 (SiN) or  SiC all high temp no or no TEC I am surprised the Si3N4 ball bearings need any lubricant. My guess is the lube is not for the SiN ball but for the Invar bearing inner and outer races.

Great information, thank you!

I've had people insist that the oil _never_ needs to be changed on these or the newer Model 3/Y design, especially on the EV forums. They don't know what they're talking about, to put it mildly. Oil degredation and contamination happens eventually, and even with the external oil filter as is on the 3/Y.

Thanks for watching

Early tesla s had vibration and noise problems. I thinking some of the overbuilt parts are the result

Interesting, thank you

I made this video of my car in DEV mode since I couldn’t find any other videos to send to you. https://youtu.be/_EnEx4ejOn0

I’m sure someone else has posted that you need to put your functioning car into dev mode to see the coolant path with temperatures. But if not you should.

I do not know how to do that. Can you tell me?

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.

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

Thank you sir for this great video. I'm a master student specialized in EVs and i was wondering about the rotor of Tesla 3's motor, but now it seems that every thing is clear. Induction motors are proving their high performance. Moreover, their efficiency and low cost make them rated as the best choice for EVs. It will be my pleasure to make contact with you sir to share and exchange some ideas.

Thanks for watching

Isn't the differential gear the same in all the Model S driveunits? Only difference with the Performance model being the inverter?

No, there is a small motor with a different gear ratio in the non-performance AWD models.

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

Thank you very much

Lubricants better see an Amsoil dealer.

Thanks for watching

Your qualifications and credentials are incredible! Thanks for making these videos

Thank you very much!

Hey what type label maker do you use? I love the professional look of the parts you used.

It is an 11 year old Brother P-Touch label maker. They sell newer versions today. I use the "Extra Strength Adhesive" labels. The others just fall off

Excellent Thank You

Glad you liked it!

it was better to put , one motor / wheel , no need for differential gearbox , control everything with software , better balance for whole car .

Thanks for watching

SKF = MADE IN SWEDEN

Good bearings!

I now realize the materials advancements deployed to make ZZZZZTesla so hot!

Thanks for watching

my oral-B tooth brush has 48800 RPM , even better then telsa car motor

LOL, Thanks for that

More torque than a room full of women.

Trouble maker!

The amazing thing is, the old V8 and V10 F1 cars use to rev to 18,000 RPMs. Think about the forces on the valves, springs, pistons, conn-rods.

Amazing technology

Amazing Video.... Hope To See Tesla Latest Induction Drive In 2020 Model S Or X

I hope so too

Amazing job....

Thank you so much 😀

09:30 *"uh, the next shaft we have,,, i don't know its' exact name, i just call it the motor shaft"* that would be the 'input shaft'

That makes sense! Thanks

Damn thats Green manufacturing right there. Lol so hypocritical

Thanks for watching

That looks like an AMAZINGLY small size for any device handling 400 kW.

Yes it does. Thanks for watching

Great detail and depth, very interesting, thank you.

Glad you liked it!

Another excellent and thorough video from you. Keep up the good work sir.

Thank you

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

Thank you!

I appreciate your detailed explanation of drive gears, bearings and awesome coolings sysytem on this motor/transaxle. Neat to see how heat is removed. I wonder if the idea to use rocket fuel as coolant in Space X rocket engine nozzle came from the stator surrounded cooling system in this motor. Is this type of thin casing cooling used elsewhere in machines?

Thank you very much

It's nice of Tesla to put labels on everything so you know what it is. Lol

That is what I was thinking!

Great video! Two questions, where is power and torque measured? Is this input power? I think I remember, that electrical motor power rating was measured in electrical input power, which would be highest if you clamp the rotator and give it full beans. With torque, I have no idea, as I am an radio frequency engineer only, but the conditions would be quite helpful for an understanding

Slow down man slow down,you'll blow the trans-axle,I'm Hudson he's Hicks.

LOL! You can speed up the video if you want to

Awesome footage

Glad you enjoyed it

Nissan Leaf = 8 bolts.

Yes, I was wrong

Are you planning to do the same for the Model 3 motor? I'm curious about the differences between the PMSR Model 3 Performance motor and the Induction Model S P90 motor.

Yes I am. Both the rear and front motors are sitting right here waiting for me to get to them. I am finishing the Model S with two more videos in the next week and then the Model 3. Thanks for watching

It was an absolute delight to listen to you explaining the functionality of the rear motor and drive unit. Thank you.

Glad you enjoyed it!

@6:15 counting 8 bolts - how many times did you look?

LOL, I knew it was 8, but said 6 in the video. I'm getting old ;)

who prints your labels :D

I do, and it takes forever!

Thanks Professor. It is fascinating!!!

Glad you enjoyed it

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..

Thank you very much

I’m a motor / ASD guy. This is a brilliant explanation! Kudos.

Thank you very much!

Great video. Looking forward to the M3. My only question is on the specifics of the rotor cooling. How does that cooling shaft interface with the rotor at such a high speed? What kind of interface material is that? And what is the path of the fluid through the rotor? I wonder how coolant runs through when spinning at such high speed.

There is a seal next to that ceramic bearing. The seal must be a remarkable design to hold up at those high rpms

open diff lol do they have a lsd option at all ?

No, they use the brakes to control wheel slip

Nice video perhaps can you provide the skf ball bearing name or designation to me please ? Should be appear on the bearing above itself and both side had it own part name.@16:47

Thanks, coming this weekend

@WeberAuto thx i will be buy it for a normal testing. Nice with the video which provide the teeth numbers and more detail on it. Expecting your next video.

Thanks. BB1-3793

@23:08 the oil pump uses a plastic gear. I wonder if that will be the failure point? Any manufacturer that machine a metallic gear as a replacement upgrade?

It is actually a nylon gear. I haven't heard of failures with it. IF it failed, those two high speed bearings would fail prematurely.

A21:40 the locating bearings as they are called here take up the axial thrust. The two forces on the rotor are radial and axial. Fairly self explanatory as to what direction they are in. At least these are the terms I have always heard, radial and axial. So for example, needle bearings handle high radial loads, no axial whereas a thrust bearing handles all axial, no radial. Ball and spherical handle both, with ball usually better at radial, some axial, spherical good at both, and depending on the design can emphasize either.

Great information, thank you

Awesome video, thanks!

You are welcome

We rebuild these Tesla “Large Drive Units” every single day (on any given day, there are 10-15 Tesla powered cars at our shop). As a pioneer in this field, we had to develop lots of tools and techniques to make this all work. I’ll venture to say that nobody (outside of Tesla) has as much experience (and bigger piles of destroyed motors)!!! QC Charge Vista, California USA

Ditto Andrew reply^^^ what are the biggest or largest or most seen failure points that you come across and what can be done to rectify it?

Interesting. I know there's quite a few Teslas out there now, but I'm surprised how often you're rebuilding these already. What is the largest failure point or cause of failure for these drive units?

Thanks for the information. It is good to hear you are offering that service at your shop.

Thank you sir, very interesting. on my BMW motorbike the shaft from the motor to transmission is called the "input shaft" input>transmission. Thanks again from oz.

That makes perfect sense. Thanks

Thank you so much for the video. Engineering is key and I am impressed. Cheers, John L. in Fairlawn Virginia USA

Thank you

I find it surprising that the rotor coolant travels downwards as it cools the transmission housing. The hole at the top is small so the flow must be quite low. Must be difficult to bleed and avoid airlocks. Is it possible the flow goes the other way?

No, the direction is correct. These systems are vacuum filled, there is no need to bleed air because it is removed prior to pulling the coolant back in. Thanks for watching

Supert interesting. I will watch any of the upcoming videos you mentioned

Awesome, thank you!

Prof. What is cost of hardening car from magnetic pulse be nice to leave town if nukes on the way🤓

LOL! I do not know

Well Done TESLA !!!!!!!!!!!!! 13 Years AHEAD of ALL AUTO Makers - HEAD STUCK in the SAND !!!!!!!! 2008 Tesla Roadster ,Release 1996 GM EV-1 1913 Thomas Edison Electric Car i have a 82v Snapper String Trimmer Works Amazing - Lots of Power and Quick to Charge

Thanks for watching

Thank you for this explanation at this detailed level. Awesome information!!

Glad you enjoyed it!

370kw =. 496.178 hp and NOT 503 necessarily. Except if you explicitly state the kind of HP.

You are correct for imperial horsepower, I should have double checked. Apparently that spec is in metric horsepower. Thanks for the feedback

I absolutely hate Teslas. I shouldnt be here

LOL, Thanks for being here!

Way-cool video! Very informative, and intriguing. Thanks! I’m still watching, but 60% through the video, I’m not sure what to make of those ... 6, I think ... comparatively wimpy bolts protruding from the differential’s carrier, blocking access to the bearing to the half-shaft inside CV-joint housing.

Thanks for watching!

Thanks for the info. So much great info on Youtube!

Glad it was helpful!

But they wouldn't let me disassemble that one! 🙈🤣😂😂

LOL!

Incredible video. Love it. Thank you for your time and efforts in educating us!!!

My pleasure!

Where are the electrical connections to the rotor itself? I see can power going into the control electronics, but not the outputs.

There are none. It uses electromagnetic induction for power from the stator

Xlnt !

Thank you

I was about to stop the video because I was getting bored, but you interrupted me with the end. I had watched the whole thing! I laughed bc I have no personal experience building cars. Gosh I wanna be a mechanic. Awesome video, subscription earned!

Thank you very much

Man, I want to test drive a Tesla now !!!!

LOL, they are fun

What a wonderful job of communication you do. The details you explain are a lot easier to understand.. You are an excellent teacher.

Thank you so much!

According to the motor equations, peak torque is made at 5,650 RPM. That is derived using the basic motor equation P=(T x N) / 5250. Converting to N = (P x 5250)/T, using the peak numbers, the speed, N, is calculated as 5,630 RPM. Then, using the basic motor equation converted to find torque, T=(P x 5250)/N, using the ludicrous power in the equation gives ludicrous torque to be 496 lb-ft. If anybody knows differently, *PLEASE* explain where the mistake is in the explanation. Thanks!

The 503 hp works perfectly with the 469 ft*lbf of torque in normal mode. In Ludicrous mode the 532 hp works out to be the 496 ft*lbf of torque you calculated. I need to add a new label with Ludicrous torque of 496 ft*lbf. Thank you!

Thanks for an excellent presentation on the Tesla Motor Drive Unit.

You are welcome. Thanks for watching

Thanks professor, I appreciate your explanation of the workings of an (tesla) EV motor. Even Munro and assoc. did not give this sort of in depth analysis (unless you pay for it). Thanks again sir.

Thank you very much

Ceramic is a class of materials which includes Silicon Nitride, so a Silicon Nitride bearing is a Ceramic Bearing.

Yes, Thank you. I got that wrong

Great description, thankyou

Thank you

Look up Project Arizonian if you want to see some crazy engineering, basically it was a CIA operation to recover a sunken Soviet Submarine.

Thanks

That pipe through the motor we always called a sparge pipe when filled to rolling mills for coolant.

Excellent! Thank you!

They are a stupid, impersonal motor that has no soul and I'll be damned if I ever drive an electric car. If my hearse is electric, I'll roll over in my coffin. Horrible, horrible electric cars.

Thanks for your feedback

this is kinda click bait a tesla model s performance isnt the same as a P100D nor a 2016 model any way you cant buy none from tesla any more

Thanks for your feedback. As stated in the video description, It is a drive unit from a 2016 Model S P90D. The "P" in P90D stands for Performance.

Great detailed discription of the p90 drive motor boss!

Thank you! 👍

Excellent Quality

Glad you like it

I didn't find anything about the 2021 Model S bearings, but the Plaid version mentions carbon sleeved rotors.

I suspect we won't know anything until someone takes one apart.

Do we have 51 states now or did Nebraska or one of those other western states switch up their name to Weber?

LOL!

You guys have fantastic videos. I am sure you inspire lots of future mechanics and engineers.

Thank you very much!

You always provide great presentations! Thank you for that. It is most common for high speed bearings to be lubricated by polyolester based synthetic oils. A typical example is Phillips 66 Syndustrial Turbine Oil. These type lubricants offer better viscosity characteristics, lower coefficient of friction, and higher film strength than mineral oil based lubricants making polyolester lubricants the primary choice for very high speed, high load applications. It is also important to note double reduction helical gears are not known for their super efficiency especially under high loads. Elimination of the reduction gear system would be a real advantage. Anyone can research the losses caused by gear systems with those losses being significant. The bother I have with this motor is the typical design where the magnet field from the stator is perpendicular to the axis of rotor. This also requires use of ferromagnetic material for the conduction of the magnet field through the long path across the rotor and the long path around the stator from one side to the opposite side of the motor. Use of ferromagnetic materials in motors always cause losses due to the well known losses caused by changing magnetic fields within ferromagnetic materials. Motor efficiency suffers substantial from this antiquated design seldom exceeding 85%. A much better design is a pancake style motor where the magnet field is parallel to the axis of rotation. This style of motor, using five phases, can achieve 99% efficiency due in part to the elimination of the ferromagnetic material because the magnetic path can be a very short distance from stator to rotor. This design appears in the simplest form as a stator disk adjacent to a rotor disk. To increase output, stators and rotors may be stacked up like a stack of pancakes. Another advantage is the very high torque produce by this style of motor because the rotor reactive force may be designed with a long distance from the axis of rotation by design increases in motor diameter. Further advantages occur due to the lack of ferromagnetic materials and those losses and long time constants can allow this pancake design to be optimize for any RPM range without the need of gear reduction. All in all, one can expect in such a drive system as shown in this wonderful video presentation to experience an increase in efficiency of possibly as much as 50% at full load and likely 25% at low load. The big question is, "why is this antique design still even used anywhere?" Old habits are difficult to break!

Awesome information, thank you!

Top-notch quality video, love the level of detail. The only thing I noticed is that you sometimes seem to mix up mph and kph. Maybe try to hold one standard mph or kph (preferably metric, but whatever works for you :). )

Great point! Old habits are hard to break, but I am working on it. Thanks for watching.

Well actually i see that the ceramic ball bearings have indirect cooling through the shaft they hold on.

You are absolutely correct, I missed that

Usually the rotative part is called a rotor, could be inductive, or other, the other part is called the stator, sometimes we also can have inductive stator if the rotor is the powered part equippedd with a commutator and the coils, but that deppends of the purpose, however the both parts combined are the electrical motor.

Thank you for the information and thanks for watching

This was fantastic, and having participating in high-speed machinery design I really enjoyed the presentation of the cooling path. Many thanks!

Thank you very much!

they should've just used a lower kV motor, would've solved everything

@WeberAuto needing high temperature bearings etc..

Solved what? I do not understand

Nice comprehensive and detailed job explaining of a complex Tesla drive unit. I have a new Model Y and Tesla doesn’t require a fluid change. But after watching your video, I would think after 100k miles I would need change the lubricant or various types of fluid? What is your thought regarding that? Thanks

Thanks, I will talk more about that in the Model 3 motor videos coming up

As usual, very informative.

Thank you

Nissan Leaf has 8 bolts, not 6

Yes, thanks. I got that wrong

I'm sitting here trying to think of an alternate use for one of these motors... It's definitely possible to use it for something but it's not like a small block chevy engine where you can turn it into a blender if you really want. It's gonna take a lot more effort to make use of one of these. Pretty much once you remove the Tesla motor from a Tesla vehicle it's a brick. It's a damn shame as far as I'm concerned. I'd like to see more modular EVs. I dream of some day seeing a Tesla powered motorcycle (like a Boss Hoss but built out of a Model S Plaid or something).

There are ways to use Tesla motors in other vehicles. Thanks for your feedback

Just an FYI: Nissan Leaf has 8 bolts on the Ring Gear, instead of 6.

Yes I did notice that as soon as the professor said it, but I did not think it was worth mentioning this small mis speak as it was visually obvious. Also considering all the details he was explaining, he did a great job.

Yes, thanks. I got that wrong