Rivian Dual vs Quad Motor Teardown Comparison

Sandy and Scott compare the differences between Rivians Dual vs Quad Motors.

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[berthogendoorn]

I am totally pleased that Rivian not only improved the design with this dual motor design and made it more efficient but less costly they are hitting all the marks, way to go Rivian! Get my cake and eat it to!!!

[tylersmith]

Great video! @ 14:50 Scott got in an "at the end of the day" before sandy could, lol.

[degnarius]

Carl’s smooth voice work for the Brilliant ad did not go unnoticed. If he ever gets tired of tear downs there’s a clear fallback for him in advertising, lol!

[martylawson]

The three vs two tabs on the MOSFET modules is a cost vs source inductance tradeoff. The inductance of the wires between the MOSFETS and the input capacitor is a massive driver of EMI. So it looks like Rivian decided a filter on the input wires was less cost than using quieter MOSFET modules.

[dennisfahey]

The black coating around the FET's is likely for additional shielding and or thermal transfer. Those specific parts have serious dV/dT spikes when starting and stopping. The fact they painted both inner and outer surfaces is something of a "tell". They are mitigating something. The other thought is that they are attempting to transfer heat off of the aluminum. Black matte surfaces absorb IR and black shiny surfaced emit IR. So if you are building up ambient heat in that cavity you want to capture it, transfer it through the thermally conductive aluminum and then disperse it externally. Of course cooling loops do a majority of the work.

[mecaniqueautomf]

I think the black paint on the inverter is there to protect it from corrosion and galvanic protection. Aluminum components tend to oxidize, especially in northern regions. The use of abrasives such as salt on roads is widespread. I love it!!! Good work Munro Team!!

[JT_]

You'll notice that power difference while towing more than just zero to 60 stuff.
Nice to see Rivian doing this type of dev.

[jezza]

Sorry Sandy but GM did not invent the hairpin motor or rather the technology or technique of producing such motors. They were merely among the early adopters to implement such motors in their products.

[matthewrideout]

Rivian has a lot of things to simplify about the truck. IMO they came out of the gate trying to do too much. Glad to see the updates to the motor design.

[budgetaudiophilelife-long]

THANKS SANDY, SCOTT, AND THE MUNRO TEAM, FOR EXPLAINING CLEARLY THE BEST OF RIVIAN 🤗👍💚💚💚😊

[WilliDurpel]

To my knowledge, the Rivian with the 4 engine setup has a full 1200ps raw. The reason why it is officially only specified with 835 hp would then probably be the limitation on the part of the battery. Accordingly, it is not entirely fair to compare the setups in isolation. Nevertheless, it was of course a wise choice on Rivian's part to switch to a cheaper and lighter drivetrain, which can then also use all of its raw power.

[johanncover]

I still think the lucid motor was the most innovative with the differential inside the rotor shaft.

[brianb-p]

It's interesting that there was no mention that one motor per axle instead of one motor per wheel sacrifices control of individual wheel torque, without resorting to wasteful brake application.
There was also no mention of increased mechanical drag due to the additional differential of the single-motor unit. It isn't much simpler, because of the requirement for that differential.

[grahamrutherford]

Thanks Sandy and Scott, I found that really interesting!

[jaydeister]

Another great informative video by Sandy Munro/Munro Live! You can't make experts out of all car buyers, but seeing how stuff is put together and why is a great process for regular folks!

[jimparrUtube]

@18:15. Maybe EMI, but more likely just simple black body radiator principles.
Also, any type of quality conformal coating on an assembly like this will lower failure probability when subjected to challenging environmental issues. Just try to keep equipment going in a place like Rotorua, New Zealand for example, where the sulfur in the air (geothermally active area) will 'rot' out electronics very quickly unless suitably protected.

[lezoer]

It is really a shame not to be able to understand your entire analysis, because the translation is absent !! 😭
The musical intro is really good !! bon travail !!👍

[davidherringgo]

Excellent video and audio gentleman. I live right down the street from Rivian service center. Learned alot . Thanks to the cameraman person too. Amazing engineering.

[KiwiMechEng]

It would be great if Scott could venture a little bit into the gear reducer design regarding bearing types and arrangements, lubrication flows and where shaft grounding devices are used. I like Rivian's execution of this design.

[JT_]

Brilliant ... that's a solid sponsor for such a technical and informative channel. :)