Tesla Model 3 and Y Modular Motors

Check out the modular components and design of the electric motors on the Tesla Models 3 and Y. See how many parts are common and interchangeable.

Corrections:
1. I swapped the definition of a Hunting gear set with a Non-Hunting gear set.

TIMELINE:
0:00 Introduction
0:27 The rear motor of the Model 3 and Y
1:08 The input shaft with 31 teeth (Prime Number)
2:00 the input shaft SKF bearings for a rotor speed of 18,447 at 262 km/h (163 mph)
2:40 The countershaft and gear with 81 teeth (Factors 3, 3, 3, 3)
3:00 The input shaft to the countershaft gear ratio of 81/31 = 2.6129:1
3:10 The countershaft pinion gear with 24 teeth (Factors 2, 2, 2, 3)
3:15 The ring gear and differential case with 83 teeth (Prime Number)
4:30 The countershaft to ring gear ratio of 83/24 = 3.4583:1
4:43 The overall gear ratio = (81/31) x (83/24) = 9.0363:1
5:03 The published gear ratio is incorrect. This is a Hunting Gearset
5:48 The CV half-shafts connect to the differential side gears
6:46 MUST SEE: two cool Permanent Magnet rotor demonstrations
8:05 The modular design of the motor shafts and rotors
8:25 MUST SEE: Watch as a rear motor is changed into a front motor
10:32 The differences in the modular motors
11:35 See what a permanent magnet does to the Induction Rotor
11:55 An aluminum core front induction rotor on the Model Y
12:13 There are at least three different rotors for the Models 3 and Y
13:54 See the rear motor inverter and where it attaches to the rear housing
14:45 The matching part numbers of the rear inverter and the stator (A matched set)
15:15 The three different power and torque levels of the Model 3 and Model Y
16:15 MUST SEE: See the front motor inverter attached to the rear housing!
17:37 the common bolt pattern and opening for the stator housings
18:30 The oil-cooled stator and ATF-9 fluid
18:47 The interchangeable transmission heat exchanger
19:13 The interchangeable variable speed electric oil pump
20:25 The interchangeable spin-on oil filter
21:06 What is not interchangeable between models
21:20 The rear drive-unit is mounted parallel with the ground
22:20 The front drive-unit is mounted upside down and on an angle
23:05 The matching part numbers of the front inverter and the stator (A matched set)
26:58 Video summary and donation opportunity

I have nothing to prove this, but while looking at used Model 3 motors for sale on eBay, I gathered the following information. There are three different part numbers for the combined rear motor inverters and stators. Stators can have different milli-ohm resistance values and still appear identical.
* 1120970-00-D (24 SiC IGBT modules Based RWD model 3)
* 1120980-00-C, D, F (24 SiC MOSFET modules Performance AWD model 3)
* 1120990-00-F (18 SiC MOSFET modules Non-Performance AWD model 3)

ABOUT US
Weber State University (WSU) Davis Campus - Automotive Technology Department - Advanced Vehicles Lab. A technical description and operational demonstration of the Tesla Model S Rear Drive Unit (RDU) and Fear Drive Unit (FDU).

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QUESTIONS FOR TEACHERS
1.

[jozeskufca]

This is the professor which every student only dreamed off. Big respect to you

[mermaidmuncher]

Nobody takes the time and effort nor does anyone go into great depth and detail as you do while making these superb videos. Thanks for sharing. Your great professor!

[livingonwheels]

2 years later and this is still FASCINATING! Thank you so much for making this video.

[CarStory]

This 9.0363 gear ratio explains why the Model 3 can move forward so slowly and accurately. I was seriously impressed with the amount of control you have with the throttle pedal.

[richardwallinger]

top quality demonstration of the magnet flipping in both directions .

[rodfrey]

All right. All because of you, I'm quitting my job and taking a degree in mechanical engineering. Thanks a lot.

[davidkierzkowski]

It’s amazing how much simpler the drivetrains rotating assembly is compared to ICE.

[Californiansurfer]

Great presentation. I attended Cerritos college electrical 1995 to 1999. I worked on battery conversions vw and saw t-zero. The t-zero used lap top battery today’s Tesla. I remember the direct power no delay. We also made go cart. Six battery and controller. We used it at golf and stuff cart track. The owner wanted 30. It was a fun time. Thanks again. Downey California

[MatteoBurroni]

When the professor quotes a Munro video, that's really apotheosis!
Thanks for complementing the information which I've learned through Sandy's videos.

[rikoskokos]

It's hard to find a better video about Tesla motors with so much details and perfect explanation.
Thank you so much Professor John D. Kelly! 😊

[djosbun]

Hello Mr. Kelly,
I'm not a big fan of hybrid cars (well, except Formula 1) or electric cars yet but I am a HUGE fan of your videos. Your students are truly lucky to have you as their professor. You're helping to drive the future of automotive repair and diagnostics.

[Stefan_Dahn]

11:58 Professor Kelly and Sandy Munro would be a dream team! 😍
If I had 2 wishes, there would be 2 videos together. One at Munro and one at Professor Kelly. That would be superb! 🙏😁

[buenito]

Great to see how happy the modular design makes him. he gets giddy, you can see it on his face. Love it!!

[Arthur-gqbp]

This is my first time on your channel and I can assure you that I was amazed by the quality of your work. Thank you for sharing knowledge.

[Wol]

The engineering design and forward thinking that’s gone into these motors is very impressive: thanks for showing us what we will - hopefully - never see.

[Clark-Mills]

Thank you for an amazingly interesting in depth explanation of how things work inside there. The in-hand flippy magnet, the "hunting gear-set", the modularity of the motors... I just have to thank you now and I'm only 10 minutes into the show! :)

[AlainHubert]

Thank you, professor. I did enjoy this video!

[vezzz]

Thank you very much !!!!

I knew that for high torque gearsets, gear tooth of meshing gears had to be relative prime, but now i know the exact term: Hunting gears.

[DANTHETUBEMAN]

The small block Chevy led the way to part interchangeable manufacturing! Same starter, same distributer, same transmission bolt pattern, for big block and small block Chevy, , all the cinder headed where interchangeable on small block engine and be brake manifolds. Was great for the aftermarket performance parts industry also.

[Mtnmanmike]

This is a great video for those that MUST understand what's going on under the hood. I'm hoping to do a retro-upgrade on a classic vehicle one day, as more and more of these used units hit the streets. This is truly motivating!