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 differential to others from a Chevrolet Bolt EV and Nissan Leaf EV
5:40 A Chevrolet Bolt EV differential ring gear with 12-bolts.
6:10 A Nissan Leaf EV differential ring gear with 8-bolts!
7:30 The Counter Shaft (Jack Shaft) with 25 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 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 on-board 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
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 for more information.
Weber State University (WSU) - 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_Kelly.html
Visit my other youtube channel kgkey.info to see the amazing NVH app for vibration diagnosis!
Please consider a donation to the Department of Automotive Technology at Weber State University here: advancement.weber.edu/Automotive

Жорумдар 

  1. RagazzoMafioso

    RagazzoMafioso

    13 мүнөт мурун

    Nissan Leaf = 8 bolts.

  2. Dave Seeger

    Dave Seeger

    3 саат мурун

    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.

    • WeberAuto

      WeberAuto

      Саат мурун

      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

  3. Con el Val

    Con el Val

    3 саат мурун

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

    • WeberAuto

      WeberAuto

      3 саат мурун

      Glad you enjoyed it!

  4. usertogo

    usertogo

    6 саат мурун

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

    • WeberAuto

      WeberAuto

      5 саат мурун

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

  5. ABA SA

    ABA SA

    7 саат мурун

    who prints your labels :D

    • WeberAuto

      WeberAuto

      5 саат мурун

      I do, and it takes forever!

  6. Bendri Batti

    Bendri Batti

    7 саат мурун

    Thanks Professor. It is fascinating!!!

    • WeberAuto

      WeberAuto

      5 саат мурун

      Glad you enjoyed it

  7. Randall Hash

    Randall Hash

    8 саат мурун

    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

      WeberAuto

      5 саат мурун

      Thank you very much

  8. r b

    r b

    10 саат мурун

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

    • WeberAuto

      WeberAuto

      5 саат мурун

      Thank you very much!

  9. Andrew T

    Andrew T

    15 саат мурун

    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.

    • WeberAuto

      WeberAuto

      5 саат мурун

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

  10. Mr Ian Tchernegovski

    Mr Ian Tchernegovski

    16 саат мурун

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

    • WeberAuto

      WeberAuto

      16 саат мурун

      No, they use the brakes to control wheel slip

  11. Tang William

    Tang William

    17 саат мурун

    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

    • WeberAuto

      WeberAuto

      16 саат мурун

      Thanks, coming this weekend

    • Tang William

      Tang William

      16 саат мурун

      @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.

    • WeberAuto

      WeberAuto

      16 саат мурун

      Thanks. BB1-3793

  12. tomdickharryjane

    tomdickharryjane

    17 саат мурун

    @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?

    • WeberAuto

      WeberAuto

      5 саат мурун

      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.

  13. tomdickharryjane

    tomdickharryjane

    17 саат мурун

    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.

    • WeberAuto

      WeberAuto

      4 саат мурун

      Great information, thank you

  14. kb25j

    kb25j

    19 саат мурун

    Awesome video, thanks!

    • WeberAuto

      WeberAuto

      19 саат мурун

      You are welcome

  15. Anthony Williams

    Anthony Williams

    21 саат мурун

    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

    • Andrew T

      Andrew T

      15 саат мурун

      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?

    • WeberAuto

      WeberAuto

      20 саат мурун

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

  16. Al Williams

    Al Williams

    21 саат мурун

    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.

    • WeberAuto

      WeberAuto

      20 саат мурун

      That makes perfect sense. Thanks

  17. J L

    J L

    22 саат мурун

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

    • WeberAuto

      WeberAuto

      20 саат мурун

      Thank you

  18. ShaunieDale

    ShaunieDale

    Күн мурун

    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?

    • WeberAuto

      WeberAuto

      Күн мурун

      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

  19. Martin Stensvehagen

    Martin Stensvehagen

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      Awesome, thank you!

  20. Arne Servatius

    Arne Servatius

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      LOL! I do not know

  21. Joni English

    Joni English

    Күн мурун

    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

    • WeberAuto

      WeberAuto

      Күн мурун

      Thanks for watching

  22. Leon Johnson

    Leon Johnson

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      Glad you enjoyed it!

  23. John A

    John A

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

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

  24. Need2connect

    Need2connect

    Күн мурун

    I absolutely hate Teslas. I shouldnt be here

    • WeberAuto

      WeberAuto

      Күн мурун

      LOL, Thanks for being here!

  25. Gary Morrison

    Gary Morrison

    Күн мурун

    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.

    • WeberAuto

      WeberAuto

      Күн мурун

      Thanks for watching!

  26. maxxedwoodz

    maxxedwoodz

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      Glad it was helpful!

  27. Cesar Aguilar

    Cesar Aguilar

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      LOL!

  28. Juju-Lips Talia

    Juju-Lips Talia

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      My pleasure!

  29. Dinal Abay

    Dinal Abay

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

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

  30. dxtrty

    dxtrty

    Күн мурун

    Xlnt !

    • WeberAuto

      WeberAuto

      Күн мурун

      Thank you

  31. Jon Pritzker

    Jon Pritzker

    Күн мурун

    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!

    • WeberAuto

      WeberAuto

      Күн мурун

      Thank you very much

  32. Doug Bourdo

    Doug Bourdo

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      LOL, they are fun

  33. ed markham

    ed markham

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      Thank you so much!

  34. tomdickharryjane

    tomdickharryjane

    Күн мурун

    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!

    • WeberAuto

      WeberAuto

      Күн мурун

      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!

  35. John's Marine Solutions

    John's Marine Solutions

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      You are welcome. Thanks for watching

  36. sam maimas

    sam maimas

    Күн мурун

    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.

    • WeberAuto

      WeberAuto

      Күн мурун

      Thank you very much

  37. Chad Courtney

    Chad Courtney

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      Yes, Thank you. I got that wrong

  38. Clive Green

    Clive Green

    Күн мурун

    Great description, thankyou

    • WeberAuto

      WeberAuto

      Күн мурун

      Thank you

  39. MrKillswitch88

    MrKillswitch88

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      Thanks

  40. neil mchardy

    neil mchardy

    Күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      Excellent! Thank you!

  41. Maxx

    Maxx

    Күн мурун

    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.

    • WeberAuto

      WeberAuto

      Күн мурун

      Thanks for your feedback

  42. Zaliah

    Zaliah

    Күн мурун

    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

    • WeberAuto

      WeberAuto

      Күн мурун

      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.

  43. Juan Castle

    Juan Castle

    Күн мурун

    Great detailed discription of the p90 drive motor boss!

    • WeberAuto

      WeberAuto

      Күн мурун

      Thank you! 👍

  44. Limabean Living

    Limabean Living

    2 күн мурун

    Excellent Quality

    • WeberAuto

      WeberAuto

      Күн мурун

      Glad you like it

  45. Jake Rosendahl

    Jake Rosendahl

    2 күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

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

  46. Roger DeBats

    Roger DeBats

    2 күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      LOL!

  47. iamthemoss

    iamthemoss

    2 күн мурун

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

    • WeberAuto

      WeberAuto

      Күн мурун

      Thank you very much!

  48. zynzy4u

    zynzy4u

    2 күн мурун

    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!

    • WeberAuto

      WeberAuto

      2 күн мурун

      Awesome information, thank you!

  49. Mart

    Mart

    2 күн мурун

    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 :). )

    • WeberAuto

      WeberAuto

      2 күн мурун

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

  50. Athanas

    Athanas

    2 күн мурун

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

    • WeberAuto

      WeberAuto

      2 күн мурун

      You are absolutely correct, I missed that

  51. Athanas

    Athanas

    2 күн мурун

    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.

    • WeberAuto

      WeberAuto

      2 күн мурун

      Thank you for the information and thanks for watching

  52. Jari Backman

    Jari Backman

    2 күн мурун

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

    • WeberAuto

      WeberAuto

      2 күн мурун

      Thank you very much!

  53. LegendLength

    LegendLength

    2 күн мурун

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

    • LegendLength

      LegendLength

      Күн мурун

      @WeberAuto needing high temperature bearings etc..

    • WeberAuto

      WeberAuto

      2 күн мурун

      Solved what? I do not understand

  54. Kevin Michel

    Kevin Michel

    2 күн мурун

    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

    • WeberAuto

      WeberAuto

      2 күн мурун

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

  55. Horatio W

    Horatio W

    2 күн мурун

    As usual, very informative.

    • WeberAuto

      WeberAuto

      2 күн мурун

      Thank you

  56. CowLevelCrypto

    CowLevelCrypto

    2 күн мурун

    Nissan Leaf has 8 bolts, not 6

    • WeberAuto

      WeberAuto

      2 күн мурун

      Yes, thanks. I got that wrong

  57. Ivan F

    Ivan F

    2 күн мурун

    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).

    • WeberAuto

      WeberAuto

      2 күн мурун

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

  58. Poppie

    Poppie

    2 күн мурун

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

    • sam maimas

      sam maimas

      Күн мурун

      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.

    • WeberAuto

      WeberAuto

      2 күн мурун

      Yes, thanks. I got that wrong

  59. Robert Riquelmy

    Robert Riquelmy

    2 күн мурун

    And shat is an Igbo?

    • WeberAuto

      WeberAuto

      2 күн мурун

      @Robert Riquelmy If you meant IGBT, Insulated-Gate Bi-Polar Transistor (IGBT). They are the transistors that control the current through the three stator windings. Sorry for not explaining that.

    • Robert Riquelmy

      Robert Riquelmy

      2 күн мурун

      @WeberAuto what is an Igbo?

    • WeberAuto

      WeberAuto

      2 күн мурун

      I don’t understand

  60. aussieaeromodeler

    aussieaeromodeler

    2 күн мурун

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

    • WeberAuto

      WeberAuto

      2 күн мурун

      Thanks, they are not for everyone.

  61. Nagaraja Bhat

    Nagaraja Bhat

    3 күн мурун

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

    • WeberAuto

      WeberAuto

      2 күн мурун

      Thank you kindly!

  62. Robert Harvey

    Robert Harvey

    3 күн мурун

    Excellent 👍

    • WeberAuto

      WeberAuto

      3 күн мурун

      Many thanks

  63. superclarkey

    superclarkey

    3 күн мурун

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

    • WeberAuto

      WeberAuto

      3 күн мурун

      LOL, Glad to help!

  64. Amir Zia

    Amir Zia

    3 күн мурун

    great job! thanks a lot

    • WeberAuto

      WeberAuto

      3 күн мурун

      Thank you!

  65. Air Dad

    Air Dad

    3 күн мурун

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

    • WeberAuto

      WeberAuto

      3 күн мурун

      Not unless I can get another one. It has 74 copper bars and shorting rings cast in iron laminations. Thanks for watching

  66. A. Akram

    A. Akram

    3 күн мурун

    @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 :-)

    • A. Akram

      A. Akram

      3 күн мурун

      @WeberAuto awesome! Can't wait! Thanks alot :)

    • WeberAuto

      WeberAuto

      3 күн мурун

      @A. Akram Exact? No, but I will be showing it in another video soon

    • A. Akram

      A. Akram

      3 күн мурун

      @WeberAuto hi prof. Weber. Any idea what is the EXACT geometrical/ electrical/ cooling differences ( if any) between the performance and non performance primary induction motor/inverter/gearbox in the "pre Raven" model S vehicles?

    • WeberAuto

      WeberAuto

      3 күн мурун

      Thanks for the info!

  67. Paul1958R

    Paul1958R

    3 күн мурун

    @6:18 looks like 8 bolts to me

    • WeberAuto

      WeberAuto

      3 күн мурун

      Yes, I was wrong. Thanks for watching

  68. Steven l Mendez II

    Steven l Mendez II

    3 күн мурун

    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.

    • WeberAuto

      WeberAuto

      3 күн мурун

      Thank you very much

  69. Gacheru Mburu

    Gacheru Mburu

    3 күн мурун

    Thanks for the info!

    • WeberAuto

      WeberAuto

      3 күн мурун

      My pleasure

  70. Mohan Sivasankaran

    Mohan Sivasankaran

    3 күн мурун

    Great information.

    • WeberAuto

      WeberAuto

      3 күн мурун

      Glad you think so!

  71. Production Design

    Production Design

    3 күн мурун

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

    • WeberAuto

      WeberAuto

      3 күн мурун

      My pleasure!

  72. Donald Jackson

    Donald Jackson

    3 күн мурун

    Good explanation,very knowledgeable.

    • WeberAuto

      WeberAuto

      3 күн мурун

      So nice of you

  73. lpletsch

    lpletsch

    3 күн мурун

    Excelente vídeo, muito bom!

    • WeberAuto

      WeberAuto

      3 күн мурун

      Thank you

  74. Spellitlikeitsounds

    Spellitlikeitsounds

    3 күн мурун

    Cool, I want to see all the Tesla breakdowns now

    • WeberAuto

      WeberAuto

      3 күн мурун

      Coming soon! Thanks

  75. Lernen mit Robin

    Lernen mit Robin

    3 күн мурун

    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

    • WeberAuto

      WeberAuto

      3 күн мурун

      Thank you very much! I’ll check it out.

  76. mark scully

    mark scully

    3 күн мурун

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

    • WeberAuto

      WeberAuto

      3 күн мурун

      @mark scully Oh, yes, for sure. Thank you

    • mark scully

      mark scully

      3 күн мурун

      @WeberAuto what I was saying is it looks like the tesla ring gear and bearings can handle far more torque than their diff would?

    • WeberAuto

      WeberAuto

      3 күн мурун

      I am sure Nissan got their stressing calculations correct too. The Tesla just has a lot more torque than the Nissan. The comparison was to show the huge difference in torque handling capabilities. The leaf is a great car for the purpose it was designed; a commuter car, not a performance car.

  77. mark scully

    mark scully

    3 күн мурун

    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

    • WeberAuto

      WeberAuto

      3 күн мурун

      The ring gear width and diameter combine to handle the torque delivered to it. Although the ring gear diameters are close to the same, their widths are not the same. The larger bearings are necessary for the higher torque delivered.

  78. MrZauberwuerfel

    MrZauberwuerfel

    3 күн мурун

    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.

    • WeberAuto

      WeberAuto

      3 күн мурун

      Thank you very much

  79. DRIF L00N

    DRIF L00N

    4 күн мурун

    It's ludacris!

    • WeberAuto

      WeberAuto

      4 күн мурун

      LOL, yes

  80. J M

    J M

    4 күн мурун

    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..

    • WeberAuto

      WeberAuto

      4 күн мурун

      Thanks for your suggestion

  81. john flower

    john flower

    4 күн мурун

    kgkey.info/block/qJejopWxeMmItYY/video.html

  82. AnalogueGround

    AnalogueGround

    4 күн мурун

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

    • WeberAuto

      WeberAuto

      3 күн мурун

      @ponemark PI Thank you

    • ponemark PI

      ponemark PI

      3 күн мурун

      @WeberAuto I was looking at them a few years ago for my Gsxr1000 wheels they were around £200 each couldnt justify the cost. Expect the bigger size would be a lot more. Great videos and excellent comunication the professor makes it easy to follow.

    • WeberAuto

      WeberAuto

      4 күн мурун

      I suspect the same thing. I wish I knew their cost

  83. TRY to HELP you

    TRY to HELP you

    4 күн мурун

    This is just the best!

    • WeberAuto

      WeberAuto

      4 күн мурун

      Thank you very much

  84. Eugene Putin

    Eugene Putin

    4 күн мурун

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

    • WeberAuto

      WeberAuto

      4 күн мурун

      Thank you

  85. Howard C

    Howard C

    4 күн мурун

    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?

    • Howard C

      Howard C

      3 күн мурун

      @WeberAuto btw, Model 3 uses a perm magnet rotor design and simplified cooling architecture significantly... Like all other EVs :) kgkey.info/block/0Iabnp2rbMyqso4/video.html&ab_channel=AllEVCanada

    • WeberAuto

      WeberAuto

      4 күн мурун

      I don’t know, I am fairly new to the Tesla world. Any clunk on another vehicle is usually related to mounting issues or excessive gear tooth backlash. I suspect mounting problems if yours has been replaced twice. Maybe some loose bolts? The milling noise could be the rotor rubbing on the stator or a bearing on a gear shaft starting to go bad. I wish I knew more. Now that Tesla seems to be surviving, I am willing to invest time in learning more about their products.

    • Howard C

      Howard C

      4 күн мурун

      @WeberAuto cool thx for the confirmation and great explanation btw. Interesting we don't hear about any coolant leaking into the oil chamber given the complex routing+seal. I guess seals don't face super hot temps in ICE. Any guesses on what caused the 2 common noise issues on early DUs? 1) clunk when torque on/off (parking lot) and 2) the "milling" noise. My 13 MS85 is on its 3rd DU (first 2 swapped due to issue #1/#2) and dealing with the 30mph+ hum/droning noise now.

    • WeberAuto

      WeberAuto

      4 күн мурун

      You are correct, the Silicon Nitride bearings on the rotor are sealed and have their own internal lubrication. The rotor coolant passage is all that cools those bearings through a solid rotor shaft. The oil pump channel feeds the two bearings on the motor shaft that spins the same speed as the rotor. Thanks for watching

  86. Michael L

    Michael L

    4 күн мурун

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

    • WeberAuto

      WeberAuto

      4 күн мурун

      You're very welcome!

  87. Guns Cars and Digits

    Guns Cars and Digits

    5 күн мурун

    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.

    • Guns Cars and Digits

      Guns Cars and Digits

      4 күн мурун

      @WeberAuto It's also a 10" ring gear, so in order to make 4500 foot pounds on a 5" radius, it's more like 10,500lb of radial force. Thank you for filming these. It's amazing to see this change happen. Let's see what happens in 10 years. I'm excited to see GM's hummer taken apart. I doubt that vehicle will have everything hard-splined together.

    • WeberAuto

      WeberAuto

      4 күн мурун

      The gear reduction of 9.7344:1 also multiplies torque. The 469 ft-lbf or torque gets multiplied by 9.7344 by time it gets to the differential case (minus frictional losses) and delivers 4565 ft-lbf of torque to the tires. Those big bearings are needed for that, although the shock factor is comparable. Thanks for watching

  88. علی اسدالهی

    علی اسدالهی

    5 күн мурун

    It was Great, Thanks

    • WeberAuto

      WeberAuto

      4 күн мурун

      Glad you liked it!

  89. Tim Spears

    Tim Spears

    5 күн мурун

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

    • WeberAuto

      WeberAuto

      4 күн мурун

      My pleasure!

  90. That Jeff

    That Jeff

    5 күн мурун

    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.

    • That Jeff

      That Jeff

      4 күн мурун

      @WeberAuto ah well. Would have been nice to dump the excess heat somewhere, even if it was a minimal amount.

    • WeberAuto

      WeberAuto

      4 күн мурун

      As it turns out, no coolant is used to heat the passenger compartment. I was wrong to suggest that. There is only an electric positive temperature coefficient (PTC) heater. Thanks for watching

  91. Mark Ferraro

    Mark Ferraro

    5 күн мурун

    great job John thanks so much

    • WeberAuto

      WeberAuto

      5 күн мурун

      Glad you enjoyed it

  92. K B

    K B

    5 күн мурун

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

    • WeberAuto

      WeberAuto

      5 күн мурун

      Thanks for watching

  93. Rafid Faiz

    Rafid Faiz

    5 күн мурун

    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.

    • WeberAuto

      WeberAuto

      5 күн мурун

      Thank you very much!

  94. William Stewart

    William Stewart

    5 күн мурун

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

    • WeberAuto

      WeberAuto

      5 күн мурун

      Thank you very much

  95. Rafid Faiz

    Rafid Faiz

    5 күн мурун

    Landslide victory of the electric motors, Thank you Professor !

    • WeberAuto

      WeberAuto

      5 күн мурун

      Thank you

  96. anonymic79

    anonymic79

    5 күн мурун

    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.

    • WeberAuto

      WeberAuto

      5 күн мурун

      I was wrong

  97. G8YTZ

    G8YTZ

    5 күн мурун

    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.

    • WeberAuto

      WeberAuto

      5 күн мурун

      Very interesting! Thanks for the information

  98. david pearn

    david pearn

    5 күн мурун

    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.

    • WeberAuto

      WeberAuto

      5 күн мурун

      Thanks for watching

  99. tachikaze222

    tachikaze222

    5 күн мурун

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

    • WeberAuto

      WeberAuto

      5 күн мурун

      500 lb-ft is just the motor torque. You must multiply it by the overall gear ratio to obtain the torque at the wheels (minus frictional losses). 500 x 9.7344 = 4867.2 lb-ft of torque at the wheels.

  100. SiliconValleySky

    SiliconValleySky

    5 күн мурун

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

    • WeberAuto

      WeberAuto

      5 күн мурун

      Thank you very much

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