Nissan Leaf = 8 bolts.

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.

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

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

who prints your labels :D

Thanks Professor. It is fascinating!!!

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..

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

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.

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

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

@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?

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.

Awesome video, thanks!

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

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.

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

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?

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

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

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

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

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

I absolutely hate Teslas. I shouldnt be 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 the info. So much great info on KGkey!

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

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

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

Xlnt !

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!

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

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

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!

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

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.

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

Great description, thankyou

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

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

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.

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

Great detailed discription of the p90 drive motor boss!

Excellent Quality

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

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

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

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!

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 :). )

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

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.

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

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

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

As usual, very informative.

Nissan Leaf has 8 bolts, not 6

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).

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

And shat is an Igbo?

very interesting video , but I'd still rather push my gas guzzler before I'd even think about driving an electric 'car'

Incredible Tesla engineering. And amazing video -- you got the knacks for explaining & teaching.

Excellent 👍

Thank you for taking time to share this, saves me taking one apart lol

great job! thanks a lot

Are you going to take apart the rotor to see what it's made out of and how?

@39:22 that is a pin-fin cold plate heat exchanger. Industry standard HE for liquid cooled power electronics. However this one is quite dense, guessing it's cuz of high current rating of this inverter. Excellent video and thanks for this deep dive :-)

@6:18 looks like 8 bolts to me

when it comes to performance size does matter, and so do the bearing ball......I'm dying here John.. I love you channel keep up the great work.

Thanks for the info!

Great information.

Superb videos. Clear informative and interesting. Thank you for sharing your knowledge.

Good explanation,very knowledgeable.

Excelente vídeo, muito bom!

Cool, I want to see all the Tesla breakdowns now

Dear Prof Kelly, nice video. Thanks for the detailed and well explained content about the tesla drivetrain. At 22:00 you say it's a 60 slot stator. Therefore it means on a three phase motor, it has 20 slots per phase, spreaded on the whole circumference. On these 20 slots, you can realize 4 poles or 2 pole pairs with so called integer slot windings or 8 poles and 4 pole pairs with fractional slot windings. This scheme is repeated for 5 times. On www.emetor.com/windings/ you can type in: Number of poles - 4 or 8 Number of slots - 60 Click on "Update". Then click on e.g the cell 60/4 to see the different winding layouts. ------ The rotor does not make the poles on an asynchronous machine. It's given by the stator. That's the reason that you can use a zylinder, tube or a coke can as a rotor ;-) At 18000 rpm, it's 300 Hz mechanical frequency and 600 Hz electrical frequency on the motor with 2 pole pairs

my guess would be that nissan got their stressing calculations right and the other two put lots of unnecessary metal in there

the huge bearings and ring gear seem excessive especially given the fact that the differential units are more or less the same size in all three units

I am pretty sure, that the small cables from the motor stator are winding temperature sensors. Also if you have any questions regarding electric motor winding design, please let me know, I work as an electric motor designer.

It's ludacris!

He should reach out to Rich rebuilds, he has all kinds of parts that the school could use and Im pretty sure Rich wont charge an arm and a leg, hell he might hook the school up being that its for educational purposes..

kgkey.info/block/qJejopWxeMmItYY/video.html

Another superb video John. I’m guessing that those dry running motor bearings must cost a fortune otherwise they would be more widely used.

This is just the best!

Amazing video. Interesting to see cylindrical bearings and ball bearings on different gears.

The oil pump channel doesn't seem to go to the silicon nitride bearing. It goes to the 2 bearings on the differential (last shaft on the drive unit). The silicon nitride bearing facing the drive train side seems like its on the rotor side of the circlip in the housing? If my understanding is correct, then the 2 silicon nitride bearings are only cooled by the circulating coolant down the middle of the stator. Am I misundertanding what I see?

Thank you so much for such an interesting video and explanation!

I bet the big bearings are not necessarily for torque. Shock load seems to be more of a concern. Everything is hard splined and the rotor is a flywheel with (I*RPM^2) potentially 9+ times the kinetic energy as an ICE.

It was Great, Thanks

As always, truly outstanding detail. I really appreciate these videos. Thank you.

I find it amusing that the motor and housing gets hot enough that the coolant used to extract the heat is then used to heat air for the rear of the cabin.

great job John thanks so much

I didn’t see the table at first and thought the disassembly was huge!

Dear Professor, when this 3 phase motor has a 4- Poles with 60 segments (slots) that leads to: - Each phase has 10 coils (5 coils opposite the other 5), totally 30 coils for the 3 phases. - Pole step = 15 - Distance between the beginning of a phase to another phase = 10 solts, i.e. Winding step = 1 to 12 for each coil - No.of slots for each phase for each pole = 5 - Angel of the slot = 12 degree Those the basic winding info. for the centric winding method, there is a wave (non centric or a Basket) winding, differ for shifting the winding step. With my pleasure.

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

Landslide victory of the electric motors, Thank you Professor !

Silicon Nitride is indeed a relatively common industrial ceramic, they don't make plates out of it. I'm curious why you'd think otherwise.

Excellent video. I think those “buttons” on the IGBT heat sinks are designed to avoid air bubbles forming on the heat sink, air bubbles would form an insulating layer between the heat sink and coolant. A similar technique is (was) used in cooling high power vacuum tubes and klystrons in broadcast transmitters.

My fascination with Tesla engineering started with the Sandy Munro/Autoline after dark piece. That’s why I now understand why the ICE we last had was the last we shall ever have. The electro/mechanical engineering is amazing. The heat scavenging is fundamental to the Tesla efficiency advantage.......the latest octovalve is a phenomenal piece of brilliant design.

11 people salty that just 180lbs of metal can push out 500 lb-ft to the wheels.

Really fantastic explanation. If was going back to school for mech or auto engineering I know where I would like to go.