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!!!

@stevenichols4639

9 ай бұрын

This night save the company. I can’t afford to keep selling the cars they are making at the loss they’re taking. This is still a premium product but it’s certainly going to cost less to build.

@Cloxxki

9 ай бұрын

Efficiency, has this been proven on the bench or road? One aspect that stands out during a tear down may not correllate perfectly with the overall product. There are a lot of ways BEV drivetrains dissipate heat to register as consumption.

@RogerM88

9 ай бұрын

@@Cloxxki and do you really think most costumers that can afford these type of BEV trucks really care about efficiency?

@Cloxxki

9 ай бұрын

@@RogerM88 No, most just want to feel less bad for being a horrible human destroying their planet, in their mind. They actually believe the climate thing. And they''ll get 3 BEVs to clean their conscience, and get a new one at least every year. Bigger battery because needs to impress the neighbours for range, and hurt as little as possible in actual use cases to do the greenwashing.

@RogerM88

9 ай бұрын

@@Cloxxki exactly.

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!

@MunroLive

9 ай бұрын

He's got the voice of an angel.

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.

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.

@hobbykip

9 ай бұрын

This is exactly what I thought. In our company we once did a comparison on various coatings vs no coating and it showed no effect in the color of the coating but having coating (counter intuitive) does improve the thermal emission of the part. I do not recall the exact numbers but it sure does something! The power those FETs have to handle is almost beyond imagination... Realizing your charging at like 400V and 200A (and for some vehicles it will be even more) and thinking of 24V 50A stick welding... Well it says it all... The same is obviously true for discharging and driving the car.

@dennisfahey2379

9 ай бұрын

@@hobbykip - Spot on. The machined aluminum will conduct heat very effectively once it traverses the surface barrier. The specialized paint aids in the ingress and egress. And I agree your first thought is "wait, what?" then you read up. They are called Thermal Barrier Coatings and depending on chemistry you can keep in or help it out. My sense here is they help it out because electronics like to be cool and de-rate with heat. So the key point is its not really paint - just resembles it. It can also potentially acoustically shield. Big FET bridges tend to ring acoustically. You hear it when you start moving more than stopping (because breaking has its own noise). That whoosh or rise in noise is the pulse width modulation/frequency cranking up the current and when you take that voltage control signal and run it through a current "amplifier" you will hear it. Since you know those frequencies you can in theory mitigate it both with shielding and "potting" any inductors in the loop as the signal travelling through those winding excite the air in proximity. You hear this on switching power supplies for the same reason. Its a noise that is easily suppressed BUT does add costs as the potting must still transfer heat too.

@ferkeap

9 ай бұрын

See some cooling ridges yet not that many, would many ridges increase the EMI again? Interesting that you mention the glossy and Matt color difference.

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!

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

@lanceareadbhar

9 ай бұрын

And for off-roading.

@WilliamAArnett

9 ай бұрын

@@lanceareadbharFor my kind of off-reading power is almost irrelevant. What matters far more is traction. And Rivian’s lack of lockers is a huge disadvantage. All that power just spins the wrong wheel and we go nowhere :-(

@A_Man_Of_Culture_

4 ай бұрын

@@WilliamAArnett You are completely mistaken, when you have a motor in each wheel you dont need lockers since each wheel has its own controller and power instead of it going through a traditional axle each wheels power can be modulated more accurately and provide better traction than any locker ever could

@WilliamAArnett

4 ай бұрын

@@A_Man_Of_Culture_ While that is theoretically true, Rivian has failed to implement it. I've been in several situations where the wheel with traction is motionless while the others with no traction spin. Worse, sometimes I've been at full throttle but no wheels move at all. When I say "lockers" I don't care whether it's mechanical or in software: just make all 4 wheels spin at the same rate and that rate is controlled by the position of the right pedal.

Thanks Sandy and Scott, I found that really interesting!

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

@MunroLive

9 ай бұрын

Right!

Excellent tear down and explanations.

@MunroLive

9 ай бұрын

Glad you enjoyed it!

Wow! Interesting! Great analysis. Love to see Rivian improving. Starting to see more Rivian on the road now. With Tesla charging network eventually available to everyone, Rivian would be a good option. Very sexy truck...

Great info, thanks guys!!!

@MunroLive

9 ай бұрын

Our pleasure!

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!!

@davidkreimer2970

3 ай бұрын

Black radiates heat better???

@mecaniqueautomf8

3 ай бұрын

no just corrosion protection

@torchlord11

3 ай бұрын

I had a run-in with corrosion with my Kenmore Clothes washer had an aluminum spider arm and a stainless steel drum that broke due to not using the special HE detergent, oops. I can attest that dissimilar metals will corrode badly if not protected with something. It took about 10 years for the spider arm to finally break but it happened eventually.

Yes! Thank you

@MunroLive

9 ай бұрын

You are so welcome!

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.

Really Well Done Show - Thanks

@MunroLive

9 ай бұрын

Glad you enjoyed it

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.

@alanmay7929

9 ай бұрын

yes that actualla makes me very angry! they dont talk about some very important stuffs here, the differential isnt a problem here loll

@Ko_deZ

9 ай бұрын

For almost everyone, the car will "never" see even a dirt road, so the potential traction benefits are basically irrelevant. Clearly a differential is way simpler and cheaper to manufacture than a motor, gearbox and inverter.

@brianb-p6586

9 ай бұрын

@Ko_deZ where I live we have winter road conditions for about 5 months of the year, so traction is a challenge without ever leaving pavement. And an extra set of gearing is no more complex than a differential; the complexity difference is only in the motors and inverters.

@alanmay7929

9 ай бұрын

@@Ko_deZ nonsense!!!! If ever the car is exported to foreign countries like Africa, south America ... How are those crap going to behave!? What kind of lame justification is that!? If you take a look at Afghanistan and countries around for example they are still driving around with very heavily loaded Toyota stout from the 80's crossing borders in very harsch environments....

@jysmtl

Ай бұрын

Seemed the focus was on the difference in motors only, not the difference in design of quad vs dual. Still, some mention would be warranted.

Nice tear down. I have a Remy Motor HVH250 in one of my cars, from about 2006, apparently used in an early Merc hybrid, has an identical oil cooling setup. I bet the black paint is so they can offer a red high power version later.. it sure isn’t EMI!

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.

Interesting stuff,cant get enough

We are expecting to take delivery of the R1S quad motor in the next few weeks. We wanted the dual motor but Rivian said that we would have to move to the new pricing structure which was more expensive so we just stuck to the quad motor. Good to see all the improvements and it should work out well for Rivian.

@beyondcleon

9 ай бұрын

Check your account again if you're not locked in. I see they are now offering the option to go from quad to dual-motor performance (for pre-price-hike order holders) and with a $500 savings.

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

@MaksimSSM

5 ай бұрын

It's repair nightmare, not innovation.

@johanncover1988

5 ай бұрын

@@MaksimSSM how often do you change the bearings in a gearbox or a diff in any car. Excluding any critical design flaws and proper oil changes you will never open the lucid drive for the life of the car.

@MaksimSSM

5 ай бұрын

@@johanncover1988One point. Transmission oil have packet of antiwear additives. Munro said that combo unit has non-conductive oil (transformer oil). This oil have not such additives.

@johanncover1988

5 ай бұрын

@@MaksimSSM In my opinion it does not need the additives as the oil has one primary job which is to lubricate and dose not have to deal with constant contamination from clutch disk fibers, unburnt fuel, carbon from burnt fuel or anything other major contamination.

@MaksimSSM

5 ай бұрын

@@johanncover1988 it transmission gear oil have no contact with fuel and burning products, with clutch too. Oil without antiwear additives was used at first stages of auto usage in first decades of 20 century. Transmissions don't last long at this time 😉

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.

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

Awesome video .

@MunroLive

9 ай бұрын

Thanks!

I LOVE IT. ❤ 😍 THANK YOU #MUNROLIVE

Great review ! Scott, you mentioned the huge capacitor that the quad motor had, how much smaller the new one is ?

So in other words GM is going down the wrong route of just adding more and more batteries ;)

@patreekotime4578

9 ай бұрын

GM is clearly in it this to win on the range stats sheets only. They dont care that a heavier truck will have more repair and safety issues. They dont even seem to care that theyll only be able to sell half as many of them. Or that long, expensive charging sessions will be a sour point for customers. It does make me wonder if Ford is working on an F350 EV, or if they are waiting for a real battery breakthrough.

@karlhering1298

8 ай бұрын

An F-350 would not be that big of a deal. It's mostly suspension, and a little bit of frame. I doubt the battery pack for them grow that much. The CyberTruck has a 3500 lb payload. Its capabilities are not that far off of an F-350. With 500 miles of range, I doubt the CyberTruck will have a battery over 150 kwh

@jackbarry9469

6 ай бұрын

​@@karlhering1298the 150 kwh pack will not yield 500 mile of range. Not close

@karlhering1298

6 ай бұрын

@@jackbarry9469 Why not? A model S does 405 on a 100 kwh battery! A 50% increase should be enough for a 19% increase in range!

I love the content... and enjoy watching Scott temper Sandy's remarks for reliability with a more guarded expectation. Reminds me when I was selling cars and folks would ask me how long is it gonna last?... and Id reply... that depends... how are you gonna drive and maintain it? And... my final statement on reliablity... have u ever seen the pyramids in Egypt? One day those will be dust also... meaning nothing lasts forever... or depending on the audience you could always say... only God can make perfection... Man just does the best he can.

Thank you!

@MunroLive

9 ай бұрын

You're welcome!

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.

Good one.. Goo explanation... ❤

Hi Sandy, I would love if you could answer a couple question, who are the major suppliers of Ev components and what component do they supply to Ev manufacturer?

What do you suggest to keep the wires cool?.

Great info but living in snow half through the year. Would dual or quad be best?

Sir I am from Pakistan love and respect for your content

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

@MunroLive

9 ай бұрын

We agree!

@MissGoElectric

9 ай бұрын

give the voice over artist a raise!

How do they cool the inverter in the new Rivian design? With oil as well (one common oil loop) or with an additional ethylene-glycol line from the central coolant reservoir?

For the single motor variant (two motors in a vehicle): Are these axle disconnects at both axles? Or only at one axle?

Will you get a VW APP550 Motor to check the improvements to the 310?

Disagreeing with the notion “Laser welds never break”, they are welds and welds fatigue over life, especially thermally induced.

@ikocheratcr

9 ай бұрын

Infineon recommends laser welding for these modules on prod. This module is designed for EVs, and automated production all over the place and I think Infineon did their homework.

@akmanarda

9 ай бұрын

Yeah they do recommend laser welding, just don’t give you the welding parameters to your own busbars; which is where the potential failure mechanism comes in.

Can you look into the Audi APA320 rear single and ATA250 Duel Pack coaxial motors on day? We haven't seen the latest Audi iteration yet.

Wow! I understood everything.

@MunroLive Did you get a dry electric motor from Rivian? Because there are no traces of oil as far as I can see. You even put the oil filter in a direction, so that all oil would flow on your bench (8:04) instead of upside down as one would normally would. The gears however look like having been exposed to oil (0:10).

Pretty complicated units, but for sure interesting. Thanks.

Great video as always but you should mention there is no locker in the dual motor so they will have to distribute torque by brake. Quad should still be king in off road and slippery situations.

I would like to humbly suggest that the reason the Electronics casing is black is possibly that black radiates heat better than a shiny aluminium alloy casing. In the days gone bye heat sinks, used to remove heat from bipolar and powerFet transistors, were invariably black anodized for that reason. Please confirm or deny this possibility, if you so deem it a significant issue. Great video!

@boredKiwi

9 ай бұрын

I think they did not mention it because this unit is cooled by coolant flow and they know the added cooling effect of black coating would be tiny.

@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.

Good morning Sandy, given that you have more access and the knowledge, do you think this makes sense taking into account All the pros and cons. I am R1T owner since June 2022 over 40K miles on it. Are you guys open to modify the Conserve mode to instead of turning off the rear motors and having 2 motors of around 400hp output just keep the 4 motors operating and have an output of about the same eliminating the side effects of uneven tires consumption from front wheel drive compared to 4 wheel drive and no sacrifice on the safety on the same.

is it possible that the black painting is used for reducing noise radiation?

Wonderful stuff guys, and very happy to hear and see you recognise and applaud Rivian for doing such competitive development and deserving success. Sure Elon will be applauding this, he needs everyone to step up.

When can we expect the Rivian motors in the Quad Motor config?

wow! ya'll R all over this! & wowee! hasn't Rivian made a huge re-design! in a huge green way! great show guy's! I'm blown away!🦾

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.

Sad to see Corey go, but Scott is just as good as a presenter!

@PaulMcElroyWasHere

9 ай бұрын

Wait is Corey gone?

@stevenichols4639

9 ай бұрын

Yep Corey announce that he was leaving Munro last week just after they got back from Tesla take over

@MrCPPG

9 ай бұрын

@@stevenichols4639 Anyone know why?

@ramblerandy2397

9 ай бұрын

Practically all of the Munro people present well and one or two, like Scott, are absolute naturals. Great content too, but of course the best ho-ho comment of the video went to Sandy as he described Sue's right foot as "aggravating". I know what he means. 😊

@jeffpicken5057

9 ай бұрын

@@stevenichols4639Wait! What!? That’s sad. Where is he going? And why?

Like a famous aircraft designer said "simplify adds lightness" You are exactly right referring to GM adding battery capacity vs spending the money to reduce weight through design. Now they are in a constant tail chasing cycle.

@obfuscator

9 ай бұрын

Colin Chapman

@alanmay7929

9 ай бұрын

stop talking crap lol!!!! the Hummer isnt a vehicle to be mass produced like a toyota corolla for example! we all know what the hummer is supposed to be! lol111

Is the black finish to assist radiated cooling?

Boy, the seal suppliers sure designed and mfg some good looking seals 😎

More comparisons please!

@MunroLive

9 ай бұрын

Sure thing

Was there anything good about the Bosch motor?

Does the cooling oil need to be changed periodically?

First time I've ever heard of the mechanical disconnect . It would be great to get some more info on that . For example why can't the efficency be obtained on the electrical side , rather than have to add mechanical parts. Can they have almost like a back emf dump valve , in the windings circuit. Does the mechanical disconnect operate in cruise mode at high speed , on a intermittent basis or for long periods of time. Is it going to be a wear part that eventually breaks or needs servicing. What conditions is the motor going through when the mechanical disconnect is most needed , and who came up with the idea first. ? Maybe it has been covered in a other video but I missed it. Cheers guys , great job.

@boredKiwi

9 ай бұрын

The AWD versions of Hyundai/Kia's E-GMP range have a disconnect at the front drive unit. If I recall it's just a dog clutch.

Cool intro music 🎶

@MunroLive

9 ай бұрын

Yeah, I dig it also!

Look forward to seeing Scott in his upcoming role on Hulu... The Wild Forest Man in Michigan!

Efficient would be to build and ride public transport. 🙃 Nice video!

This comment feeds the Munro algorithm ✌️

@MunroLive

9 ай бұрын

✌️

If you want the motor to be the oil pump, you could make the rotor have some kind of diagonals to push oil in one direction. But you could put stationary blades on the cover of the transmission case. The idea would be, the rotor would spin the oil and the diagonal blades on the cover would encourage the oil to go away from the motor’s axle.

The Quad Motors being Bosch with the slightly better warranty says a lot. I would still opt for the Dual Motor specially because of the cost savings versus the Quad.

I've driven sprint cars. Many years ago. And an EV is the only fun street car I have ever driven. I own a Ioniq 5 and an F-150 Lightning. Rivian is doing well to offer these 'lower spec' motors. Still good fun and more efficient.

Was Sandy correct about the oil characteristics? Many other EVs have 'wet' motor designs (Bolt and all H/K E-GMP range, and Tesla) but I've not heard of any that require anything other than a synthetic ATF.

When are we going to see a benchmark / table enumerating the different motors, their weight, torque and horsepower and efficiencies? In hub and axle mounts. Add the battery pack comparison and finally vehicle implementation and mileage. I'm really interested in the axial flux motors for low end vehicles. The "peoples car" aka basic transportation has zero need for 1000+HP. Never going to use it going to the supermarket or work.

Not perfect for anybody is every vehicle ever made to this point. Good work guys. Is the oil in the motors synthetic or traditional?

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 !!👍

COREY coming back next week? NICE

Non-conductive (dielectric) oil is great because - as explained in the video - you can put it where you want, but it is inferior to water-glycol as a cooling medium (heat capacity and rate of heat transfer).

@ralanham76

9 ай бұрын

Also it’s actually touching the parts that need cooling vs the heat wicking through several layers.

@brianb-p6586

9 ай бұрын

@@ralanham76Yes, that's what they explained and what I meant by "you can put it where you want". And heat doesn't "wick"; it conducts. Wicking is motion of fluid through a wick, despite Sandy's mis-use of the word.

@boredKiwi

9 ай бұрын

Is there really such a thing as non-conductive oil? I thought it might have been a Sandyism when he said that. As far as I'm aware other wet motor designs just use ATF.

@brianb-p6586

9 ай бұрын

@boredKiwi yes, insulating oil is used for transformers and other electrical equipment. Remember PCBs? They were created for insulating oil, but turned out to be toxic and nasty, so other chemicals are now used instead.

@Uriah625

9 ай бұрын

@@boredKiwiI know all of our transformers are filled with “c oil”, high voltage to low voltage. Well, I can’t say that. We have one 69Kv transformer filled with some kind of food grade oil. Our OCBs (oil filled circuit breakers) are also filled with that same “c”oil. The oil is what quenches the arc when the breaker opens or closes when placing or taking a generator offline. So there are certainly non-conductive oils out there.

cool 👍

Which of the dual motors will have the disconnect? Is efficiency mode RWD?

@alexkram

9 ай бұрын

I don't remember seeing a disconnect on the Tesla motor. Does it have one?

Cool! Well done Rivian 😄 I wonder if the black paint is as simple as making it easy to identify it as the motor’s black box? 🤔 Thanks!! Lotsa love to all ❤❤❤

@gregbailey45

9 ай бұрын

Possibly for improving thermal performance, but not sure. More likely just corrosion resistance

The reason why some companies paint aluminum castings is due to porosity problems resulting in water/ contamination problems.

@boredKiwi

9 ай бұрын

that's what crossed my mind ...

What happened with Corey? good job Scott!

my boss used to say to the apprentices why do screws have threads the answer was to take them out that's why you use a nail 1/4 of the price

Fascinating , cool video guys. Some interesting things to learn. Oil cooling that goes everywhere, almost like a engine. Hairpin stator , versus wound Coilwire. Inverter mounting built into motor frame to save cost.

The ideal would be to find out what causes heat and change the design so it doesn’t heat up. Or it minimally heats up.

LOVE SCOTT💪❤

No there is nothing to go wrong with electric cars, only one moving part. I will say they may be less complex, but some to there Arther systems are very complex, like the suspension. I love these videos when engineers take things apart and tell us what's good and what can be better.

@dennisfahey2379

9 ай бұрын

What will be interesting is they are way less complex and more capable of self diagnostics due to that simplicity. Example: How many times have you had a ICE vehicle throw a list of errors on the scanner that really only had one "root cause". That is due to the complexity of combustion, emissions, etc interacting. An EV has full access to the control and status loops of every subsystem. It can concisely say what is wrong. When it eventually fails it will be back on the road fairly quickly. But for now the parts are more expensive than they should be due to limited supplies. If you graph the common failures for an ICE vehicle and realize a vast majority do not exist in EV - and their equivalent function is more reliable - you can see my point. EV's will wear out tires as usual. Brakes due to regen will last the equivalent of four ICE cycles or better. Lubrication and coolant changes are once every couple years with normal mileage. Shocks every what five years? For these air ride I assume they will match the ICE vehicles with air ride. It is interesting though that suspension designs have become less reliable over time.

@patreekotime4578

9 ай бұрын

​@@dennisfahey2379or worse, how many times do they throw a code that has absolutely nothing to do with the actual problem? Its just that the actual problem is causing an imbalance and a random sensor is registering the imbalance. You spend hours reading forums to see if you can find other people who have seen that code and how they fixed it. A dozen people will fix it a dozen different ways because the error isnt diagnostic in the slightest bit.

@gregbailey45

9 ай бұрын

Tell Arther, too...

Wow

Great video. Why don’t EVs have at least a 2nd gear. If you can have a disconnect, how much more difficult would it be to implement a 2nd gear. Given the importance of efficiency, wouldn’t another gear make a huge difference. Thanks.

I saw an oil filter so presumably that oil and filter will become a service item at some point any Ideas how long?

@MooseOnEarth

9 ай бұрын

In case viewers missed it: it is on the bench at 8:04 and Scott puts it aside at 12:15. The black thing with "Rivian" printed on it (despite coming from some supplier). I do not know the maintenance schedule for Rivian, but for Tesla this is a 60k miles / 100k km service item. Even if it does not appear in Teslas maintenance schedule. And there is a second one that looks like an internal filter for gearbox oil at 0:12.

@boredKiwi

9 ай бұрын

It's probably a plastic screen and is not intended to be serviceable. Common for other oil-wetted motor designs as well.

@MooseOnEarth

9 ай бұрын

@@boredKiwi Plastic screen? Can't believe that. That is an oil filter.

Oil filled motors are common in deep sea submersibles, primarily not for cooling but to keep the motor from getting crushed at depth. It's hydraulic fluid, don't know the type.

12:50 Does the disconnect unit works as a differential lock where both wheels turn at the same speed, something needed in muddy situation, or does the disconnect unit function is to isolate the motor from the wheels so the truck can be tow behind another vehicule like an RV instead to have to be transported on a platform ?

@andrewashmore8000

9 ай бұрын

Was wondering the same myself.

@MayurBirari

9 ай бұрын

Disconnect is to disconnect the wheel and the motor for efficiency. Even when the rotor runs unpowered it cuts magnetic fields creating losses. Disconnecting it makes it more efficient

@WilliamAArnett

9 ай бұрын

Sadly, the disconnect is not a locker. Methinks Rivian doesn’t care much about serious off-reading.

@TheUweRoss

9 ай бұрын

@@WilliamAArnett Well, serious off-roading is what the quad-motor drive-train is for, and in that application, it is pretty much unequaled.

@WilliamAArnett

9 ай бұрын

@@TheUweRoss yeah, except that it doesn't work very well. Try climbing a slippery steep slope: no matter how much right pedal you give it, it will just sit there with one wheel spinning slowly and the others stopped. The one that spins is the one with the LEAST traction so it does nothing. The one(s) with traction don't get any torque. Obviously, they have independent control of each wheel. It seems to me that this is just a software problem that could be fixed with an over-the-air update. But this problem has been known for a year (at least) with no improvement. They do send out lots of software updates so they do have a team of engineers that could fix this. That they don't can only mean they think this is a minor problem. But for me, crawling up the rocks is the. truck's main function. If it can't do that, its other virtues are moot. There are many other aspects of the R1T that limit its rock crawling ability (no rocker protection, poor approach and departure angles, no winch, too small tires, too big wheels). But those are all harder to fix.

Between this guy, Jordan and Sandy.. You guys are some rockstars at this. And a few of your other guys on the B-team are not far behind. I wish this channel had been around in 2010..

I hope you guys will one day get your hands on the upcoming Koenigsegg Dark Matter 6-phase motor. Tuned to match thei're ICE's for top rpm @8250, 39 kg, 800 hp. I suspect there's nothing cheap about how they produce that, but full production is 300 pcs plus spares until we hear them do more with that MGU. Their FreeValve (yes, pure hypdraulic valves) 3-cyl 2L turbo 600 hp 70kg ICE will probably also raise some eyebrows, and I do hope they will sell (licenses) of that engine far and wide. Seem amazing for any fuel scrootch hypercar, spec series race car, etc. And then there's their new 9-spd gearbox that's tiny and faster than you've every seen. Of and you can switch it to 6-stick-manual. The best gearbox design ever, when the world is trying to tell us ICE is baaaad.

@andrewashmore8000

9 ай бұрын

Cool.

@andrewashmore8000

9 ай бұрын

Cool info.

Why all the extra parts? Why not 04 hub motors instead?

The power electrics on the radars of the AWACS planes are submerged in 3M glycol that has a higher thermal conductivity than water and is obviously electrically non conductive. Plus you can run a brushed DC motor submerged in glycol or diesel without shorting so no need for oil which has terrible thermal conductivity.

Gawin nating test drive...yung stator Nayan gawing generator lang...lagyan ng apat na DC motor ipalibot Jan sa stator kahit 24volts lang lagyan ng gear yung DC motor at Yong stator na parang sa flywheel lang...TERBAP to SANDY...

@20:39 When you guys are talking about the mosfets, I would disagree, As an electrical engineer, I know that electronics tend to fail also and if one of the welded mosfets fail, you will have to replace that whole thing which could cost more. I also don't like bolted on. there is a best of 2 worlds though, that is a silver solder joint. why silver, the high melting temperature and strength.

On the topic of Rivian, I had heard of poor tire wear issues at different ride heights. Has the team or Sandy noticed any issues on tire wear now that they have had a Rivian for some time?

@KCautodoctor

9 ай бұрын

Vehicle alignment is set at a specific ride height per Rivian's directions in their repair procedures. If the customer plans on driving mainly in another ride height, then they need to get the vehicle alignment done at that specific ride height, since it will noticably effect the alignment angels and thus cause uneven tire wear

@mikejames4784

9 ай бұрын

Tire wear not an issue for my R1T. Only 1/32 of wear at 5k miles

@ericjarvis3051

9 ай бұрын

I've lost 3/32 in just over 10k. Drive aggressive occasionally. Always keep at standard height unless off road. That's what the suspension is tuned for. The range bump isn't even noticeable at lower heights and more tear on tires

@user-vp1sc7tt4m

9 ай бұрын

10+ thumbs up @@KCautodoctor

1. Why painted back? My take: they're using black-body emission (radiation) principle to enhance thermal management: added heat dissipation without adding mass 2. Isolating the wheel bearing is most efficient instead of decoupling at the gearbox

GREAT to see a non-scummy SPONSOR.... Supplments are total BS 👺

What a shame they didnt implement a three function disconnect that could lock the differentian as well for offroad.

What are the max rpm specs of each motor? And is there a difference in gear ratio?

@brianb-p6586

9 ай бұрын

The reduction ratio of the new unit appears to be very high, suggesting a high motor speed. At 10 seconds in the gears are shown, but not enough of the input gear is visible to be sure of the tooth count, and the small gear of the second stage isn't visible at all, so it's not practical to work out the ratio from this image. Since this video ignores the reduction gearing, I don't think there's another point at which the teeth of all gears can be counted.