Yikes! Overheating motors.

[FooF]

W C

Follow up question: How is this heat transferred to the battery?

https://chargedevs.com/newswire/riv...imiting-factor-for-maximizing-ev-performance/

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[Truffle]

Next update - wheel well pizza ovens! I’ll be happy I have my quad when I want high output pizza for the whole family

 

[Zoidz]

W C
Follow up question: How is this heat transferred to the battery?

Glycol system. Here's a deep dive - all ya need to know!

Munroe Teardown Video

 

[R.I.P.]

Want to see how heat is moved around in a Tesla? The above teardown demonstrates how far evolved the Teslas are when compared to anything else being built, whether EV or ICE. It also talks you through how heat is moved between components (earlier question in the thread).

Rivian is nowhere near this advanced... yet, but apparently they are starting to copy some of this tech, which is a truly great thing!

 

[Singletracker]

To be clear, initially, I was somewhat curious as to why the motors were clearly running much, much hotter than normal, even during very benign driving conditions. However, when the slider graphics bar on the hottest motor (270 degrees) turned reddish, curiosity turned to concern. Where would it have gone had I not stopped for a red light and then reduced the regen mode ??‍ While I didn’t see a written warning, it did seem the red bar was a warning. At this point, I’m not losing a lot of sleep over it. To those who imply I shouldn’t have been concerned, I say, it‘s not your $80K rig.

Thanks to those with more knowledge who have explained how this could be somewhat normal for the Rivian. Living with an EV certainly involves a learning curve. It’s so different than an ICEV. It’s fun learning new stuff and trying to figure out all the things the vehicle is trying to tell you, some of it counter intuitive. I’m pretty mechanically inclined and have done almost all the work on my long list of ICEV’s for years. EV’s are a whole new animal and I am learning sooo much.

 

[CrazyOne]

Want to see how heat is moved around in a Tesla? The above teardown demonstrates how far evolved the Teslas are when compared to anything else being built, whether EV or ICE. It also talks you through how heat is moved between components (earlier question in the thread).

Rivian is nowhere near this advanced... yet, but apparently they are starting to copy some of this tech, which is a truly great thing!

The heating system did not perform well in the extreme cold of the previous winter. Tesla released a firmware update in January 2022 to fix it. However, the coldest part of the winter was usually over by then. It remains to be seen if the heating issue is really resolved this winter. Some owners reported that the update did not solve the problem.

 

[R.I.P.]

The heating system did not perform well in the extreme cold of the previous winter. Tesla released a firmware update in January 2022 to fix it. However, the coldest part of the winter was usually over by then. It remains to be seen if the heating issue is really resolved this winter. Some owners reported that the update did not solve the problem.

The wife's 3 has the 2020 Tesla resistive heating. My Y has the new heat pump system. New heat pump system is a great improvement in the very cold over the old Resistive system. Tesla did replace the pressure valves in the system under warranty, but even in temperatures down into the teens both passengers and battery were kept nice and toasty all winter.

In contrast, I find my R1's climate control a bit underwhelming. I'm not worried, I am confident it will get better as their systems mature. It took Tesla a few years to get where they are .

 

[OnePedaler]

Glycol system. Here's a deep dive - all ya need to know!

Munroe Teardown Video

Excellent! Amazing they use off the shelf parts in the system. Love that they have a filter for the fluids as a safety feature for the system where other vehicles don’t. Thanks for posting.

 

[OnePedaler]

https://chargedevs.com/newswire/riv...imiting-factor-for-maximizing-ev-performance/

Thanks- good article on overall cooling/heating loops.

 

[godfodder0901]

To be clear, initially, I was somewhat curious as to why the motors were clearly running much, much hotter than normal, even during very benign driving conditions. However, when the slider graphics bar on the hottest motor (270 degrees) turned reddish, curiosity turned to concern. Where would it have gone had I not stopped for a red light and then reduced the regen mode ??‍ While I didn’t see a written warning, it did seem the red bar was a warning. At this point, I’m not losing a lot of sleep over it. To those who imply I shouldn’t have been concerned, I say, it‘s not your $80K rig.

Thanks to those with more knowledge who have explained how this could be somewhat normal for the Rivian. Living with an EV certainly involves a learning curve. It’s so different than an ICEV. It’s fun learning new stuff and trying to figure out all the things the vehicle is trying to tell you, some of it counter intuitive. I’m pretty mechanically inclined and have done almost all the work on my long list of ICEV’s for years. EV’s are a whole new animal and I am learning sooo much.

The only reason we say not to be concerned is because it's operating as designed, and there isn't really anything you can do about it. And price has nothing to do with whether or not you should have a questioning attitude about your vehicle.

 

[GhostAndSkater]

It is accomplished by lowering the voltage to the motors and upping the amperage. The motors become less efficient and produce heat. This is transparent to the driver, power is delivered as needed/requested. You will hear it called "running lossy".

I was unaware of anybody but Tesla doing this. Bodes well that Rivian copied this creative and effective technique.

This is completely wrong

Without getting to technical, the way they do it is to change the phase of the magnetic field such as it's not in its optimal position for efficient torque production, so for the same wheel torque the total current increases. The input power increases for the same output power, resulting in lower efficiency and more heat

You can't do what you said, a motor isn't a variable resistance resistor that you can up or lower the voltage and proportionally increase the current as you please to generate more waste heat

 

[mindstormsguy]

I hope instead of taking this information away, that they just add more context. All it should need is a “motors warmer while heating battery” notification, and perhaps to prevent the orange and red coloring when it’s happening intentionally.

 

[Singletracker]

Without getting into a pissing match with anybody, when I reported this issue to Rivian, the rep I chatted with (unknown expertise) did seem concerned and took down a lot of info. He was also apparently communicating with another tech person, during our chat session, and kept coming back with more questions. I expect to hear from a true tech person, maybe tomorrow. I’m hoping the tech confirms what the more knowledgeable people on this forum have said and all is well. I will report back on what I find out ?

 

[WSea]

Doesn't really. As far as I understand with the Tesla they run the motors at a very low stall and use the brakes to hold the car from moving which generates the waste heat

What?? L2 charging raises the battery pack temp

 

[UnsungZero_OldTimeAdMan]

Better stop driving and run for the nearest underground bunker before your Rivian turns into a mushroom cloud.

You should see how hot the exhaust manifold of a typical ICE gets. This is nothing.

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