Hummer EV Front Motor: Power, Pounds, and Park Pawls

[@cerrillosstore3913]

I'm really enjoying the casual fun way of sharing your knowledge with us. Fantastic presentation.

[@MunroLive]

Thanks for watching!

[@nuttyDesignAndFab]

you are correct; the reason the pawl is on the front is to have BOTH axles parked. If you have AWD, you can get into situations where you drive up a slippery hill, park which locks just the rears, then the car rolls with the rears locked since the fronts are now free wheeling instead of gripping.

[@bob15479]

For an off-roader, being able to lock all four wheels when parking is essential… and given that on a dual motor vehicle you can’t accomplish that via parking pawl + transfer case… either this system or a 4-wheel Parking brake is needed

[@KiwiMechEng]

An Ioniq 5 owner reported a few weeks ago that his car was sliding down his icey driveway. The EPB and the pawl are only on the rear axle.

[@kens97sto171]

@@KiwiMechEng There is video of a Tesla doing this also... sliding down a snowy driveway.. car then went across the road and into a ditch.

[@normangebhardt2092]

Thanks Kevin and Jordan for explaining all the motor complexities and making it interesting.

[@millinden]

Thanks for reminding me to calibrate my eyes!

[@MunroLive]

It's a crucial part of any engineer's morning routine!

[@budgetaudiophilelife-long5461]

THANKS JORDAN AND KEVIN,AND ALL THE MUNRO TEAM 💚💚💚

[@MunroLive]

Our pleasure!

[@kalmmonke5037]

@@MunroLive how about mahle non magnet recyclable electric motor , paired with subaru high torque cvt

[@mikejames4784]

Kevin represents Hummer and Jordan represents Lucid in EDM sizes. Fantastic analysis, keep up the great work guys, love the channel!

[@georgelewisray]

WONDERFUL Work , thanks so much for sharing your knowledge/experience.

[@MunroLive]

Thanks for being here!

[@davidmenasco5743]

​@@MunroLiveI'm jealous! It's like you're reviewing the ultimate tinker toy set!

[@ouch1011]

Very different cooling requirements between a jellybean shaped Lucid and a 9000lb brick like a Hummer EV, especially if it is also towing a trailer. I’m glad that GM seemed to make a solid effort towards keeping at least the front drivetrain cool and well lubricated.

[@MrFoxRobert]

Thank you!

[@MunroLive]

You're very welcome!

[@bengerendash]

Yay! I love episodes with Kevin itself!

[@worekarolis]

Itself

[@zachkane7378]

Enjoying seeing all your guys get more comfortable in front of the camera 😊

[@richardnedbalek1968]

🤭JORDAN: “I don’t have a lot to say.” Proceeds to masterfully share half the load with Kevin… Well done, you two! Especially found the part about the non-ferrous shavings in the gross particle filter concerning.😳

[@TundishSkul]

Nice video guys! Liquid nitrogen, assembly paste, and proper interference tolerancing come to mind when watching this video.

[@SaylessSuge]

I thank you for putting this out. I’m in an adult life. I wanted to learn how to drive you be surprised what age am I and I wrote down all the most important things so I can save up a lot of money and get the Hummer EV even the Hummer H2. I love learning something new every day and get things started before it’s too late so I won’t freak out anything that’s happening to my car if I can get it that’s why I like to write stuff down before I get it and learn how to drive I appreciate you putting this out 💯

[@johnreese3762]

Great info guys, thanks!! Hi Sandy!

[@pasad335]

Jordan: "overall kind of kind of a cool setup given the size of the vehicle and how they executed that" That says it all. If this was an off-roader channel and they were tearing down the latest Ram TRX, people would be gushing about how rugged and over-built it is.

[@michaelplotkin7383]

Another great job. Thanks.

[@MunroLive]

Thanks for watching!

[@southport3399]

Great video guys! Thanks editors:) much appreciate the acronym definition overlay. KZbin auto-generated captions try to make words out of acronyms & confuses me when I don't hear the letters cleanly (tinnitus & differences in English pronunciation across the world make deciphering acronyms a regular problem). No longer looking for engineering definitions of Preston stators or Bolton stators that KZbin captions referred to;) Released further into the video it was 'pressed in' & 'bolt in'. Cheers!

[@aurelio-reymilaorcabal9669]

Looks like GM is the leader in Complexity and production costs, yes Mary you're leading!

[@fonz-su6xb]

😁

[@carholic-sz3qv]

Wtf are you talking about!? This is a hardware to move a over 9000pounds of vehicle! You think Tesla just went and slap the model x plaid motors' in the semi!? Grow up please!!!

[@GavinEarnshaw]

I'd be horrified if i opened up a filter on a new vehicle and saw those shavings😮 Also an interesting comparison with the diffs. The lucid used a small 4 pinion centre and the hummer a large 2 pinion. As an off road person im quite disappointed about the hummer only ysing 2 pinion. We tend to fit 4 pinion centres as they are stronger and can cope with shock loading better.

[@23billd]

This is a good example showing why the Hummer EV will be just a niche vehicle. The production costs will keep the price well beyond the reach of most customers. I seriously doubt that they ever will make more than 100 per month.

[@fonz-su6xb]

I said this as soon as I saw the unveil. It's gonna be a rare vehicle on the road.

[@lighthousesaunders7242]

You mean the amount that GM will lose per vehicle will make it unaffordable to them at almost any price sold

[@LakeLake123]

They made around 1,800 just last month.

[@bob15479]

So strange to think they could have just make a regular EV truck like ford and it would be selling like hot cakes right now… but instead they went for a juggernaut

[@mikafiltenborg7572]

​@@LakeLake123 GM sold 2 HUMMER-ev in Q1 2023 😂😂😂

[@arthanareeswaranbalasubram1147]

Nice explanation

[@Chas_Reno]

Well Done.

[@KiwiMechEng]

Points I would like one of your mechanical engineers to comment on is (1) the bearing arrangements between the motor and GRU pinion that avoid a geometrically-over-constrained condition present in the early Nissan and Hyundai/Kia offerings, (2) how motor shaft stray voltages are drained off, and (3) is there a magnet in the oil intake and is it serviceable? Thanks, you guys are awesome!

[@nickwulf]

Jordan's Eye-crometer

[@solarheat9016]

That is a fascinating work of engineering. That one front motor looks like it could power a bus.

[@Nebula1701]

I mean I'm quite sure it's used on the Zevo 600

[@matthewlibanio8227]

I like how they said it's serviceable. Sometimes too lean means that things become extremely costly to fix or repair. If it means less cost to the owner in the long run, then it is fine. All these things are nice under warranty, but out of warranty it seems the F150 could or may cost a lot more to repair and maintain.

[@rogerstarkey5390]

I think they actually said "not" serviceable? Not to mention, the shavings in the filter at 26:22 mean that it's quite possibly going to lunch itself at some point.

[@FinanceNinja]

It's not serviceable.

[@flocksbyknight]

I've had trucks slide on ice and snow in Park while in 2WD. Locking front and rear tires in Park makes sense in slick conditions.

[@sudheerkumar5966]

Very nice

[@darrenschmitz2712]

Another good teardown guys. Interesting to think you tore apart 1/2 of GM's Hummer production for last quarter.

[@DarylOster]

Aluminum gaskets likely to deal with tolerance stackup issues - also much stiffer than paper, felt, or elastomer.

[@DarylOster]

Also much better heat transfer than using a material with heat insulating properties.

[@martinlutz2390]

They talk about 800 volts going to the motors. I don’t believe 800 volts goes to the motors. The Hummer has 2 400V batteries on top of each other and they are only hooked in series when high voltage DC charging. Otherwise enjoyed the video as usual from Munro.

[@bob15479]

I’m glad they used that aluminum gasket so they could save time when making 2 vehicles per quarter.😊

[@Dularr]

They are making Silverado now.

[@gmv0553]

GM built 1800 of them in May!

[@jacoblf]

rotfl

[@simson4t]

They use Front Park pawl, because this version of the truck is trimotor, the rear Drive unit has two separate Motors and gear sets.

[@phillyphil1513]

good "catch" (no pun intended).

[@Reddylion]

Nice video

[@newscoulomb3705]

You seem to be assuming that decisions made for durability, off-road capability, performance, robustness, and serviceability were the result of rushing to market. Yes, the GMC HUMMER EV was a quick-to market; however it is a bespoke, hand-built platform, and most of the excess is justified because it is such an exclusive, flagship product. I think that what would be more telling is a comparison teardown of the Cadillac LYRIQ or (for and even more direct comparison) the Chevrolet Silverado EV, which would be GM's "lean" manufacturing take on the HUMMER EV.

[@PumpUptheJam81]

I agree. People seem to be making remarks as if this is how GM engineers all their products. I think this beast was designed to be sort of a “test mule” for future concepts and iterations for the pickup lineup. Even Rivian has some items that are completely over engineered and unnecessary, but they are also a flagship product with the price to match.

[@newscoulomb3705]

@@PumpUptheJam81 Yup. I expect the WT versions of the Silverado EV to be much leaner for the sake of mass production. They are targeting 500,000 a year, so it has to be easy to produce in volume.

[@scottsmith7566]

great video! what is with the ground off spot on the front diff pinion shaft?

[@jaydeister9305]

[@GamerDad1987]

I would really love to deep dive into the stator

[@zacharypiech2930]

Love you guys, you’re THE best! Please try not to say “right”. We def don’t know, that’s why we’re listening. The “right” word count was off the charts :)

[@NO3V]

Did you sift through the oil to look for even larger shavings? If those things got to the filter who knows what did not fit through the pickups.

[@AbBc-w4q]

why would they get thru the filter? Kind of silly to use an oil filter that would let chucks of metal through it

[@NO3V]

@@AbBc-w4q Huh? What are you talking about? They are in the housing since production or come off from components during usage. So they will be in the oil - before reaching the filter. The filter is one element of the oil loop and is meant to remove them IF they get there - and that is my question: could some shavings be so large they never make it to the filter.

[@mrrkrr]

The Hummer is only in '800v mode' while fast charging. The motors are 400v, not 800v.

[@bryanstrom812]

This is way over my head but I like the breakdown anyway.

[@stevebakker6884]

By the way, if you happen to be looking for content to produce, you could maybe do another video on this same motor, from an architectural point of view. Meaning, ther type of motor (induction, PM, Hybrid reluctance PM, etc. The kind of wrappings on the stator (copper or aluminum, square of round wire, C wrap or right angle turns (I forget the name at the moment), a look at the rotor laminates, chevron layouts for the magnets). That kind of thing. :> Such discussions of course can lead to comparisons of motor design between and within makes, as well as generational comparisons.

[@brianb-p6586]

The motor is like most other GM motors: interior PM (with reluctance effect like all IPM motors), bar windings of the hairpin style, "chevron" magnets. Aluminum is only used in some induction motor rotors, not stators. They can review that, but it's all visible in his video.

[@stevebakker6884]

@@brianb-p6586 That is a good point. I guess these motors are nearly "commoditized" these days. One difference being the stator windings. Hairpin vs C windings? Round vs square wire? But I am looking for nuance also. Would love to see a comparison among them all.... weight vs HP/Torque. Physical dimensions vs HP/Torque. There must be differences. The Lucid motor may stand out.

[@johntyson1958]

how in the world did you get your hands on this very rare truck!?

[@timboatfield]

I'm wondering who has the other one?

[@AbBc-w4q]

@@timboatfield lol that was good!

[@MikesTropicalTech]

I wonder if things like the parking pawl concept are inherited from previous GM's heavy vehicle designs.

[@kens97sto171]

For an offroad vehicle.. imagine it parked on a steep incline that is gravel or dirt. If you only had E Parking brakes on the rear.. it can slide down the hill. You would either need a park Pawl or another E Parking brake assembly on the front. There are videos of Teslas rolling down snow covered driveways... rear wheels locked.. front wheels spinning.. car then went across the road, and into the ditch in the middle. With a traditional 4x4.. you would leave the vehicle in 4wd.. and the parking pawl would lock the trans.. and thru the driveline lock both front and rear axles.... AND you could put on the parking brake too.

[@oisiaa]

An electric parking brake is so nice. The car doesn't budge even an inch once you put it in park. No rocking when you release the brake pedal.

[@brianb-p6586]

Placing the parking pawl on the front, while using parking brakes on the rear, doesn't just add redundancy: it adds traction. On a slippery surface a vehicle can slide downhill with the tires on one axle locked; with both axles locked all tires contribute traction.

[@eugeniustheodidactus8890]

When parking in my sloped driveway, my Model Y occasionally warns me that the eBrake is not to be depended on, which is a real buzz kill. _( The Ebrake has never failed so I assume this error message is bogus.)_ So I definitely *favor a park pawl* instead of an occasionally "iffy" eBrake. Perhaps Tesla should provide us with beefy wheel chocks.

[@gregbailey45]

I saw a short not long ago where a Tesla e-brake failed and the car ran backwards down a driveway into the street.

[@XXfea]

The kind of car a blacksmith would make

[@DavidHRyall]

Was there ever a review of the car itself? I don't recall seeing anything... just this video and one other on the batteries. Am I missing something? 🤔 P.S. love you're work 🥰

[@MunroLive]

Not missing anything. We never reviewed the vehicle on camera.

[@fonz-su6xb]

If you want a short quick review of the vehicle, Forrest's Auto Reviews did about 2 or 3 60-second clips of the Hummer. Hope it's alright with Munro that I mentioned his channel. Just helping out David.

[@AbBc-w4q]

@@fonz-su6xb Sandt aint no lefty... dont need to worry about him censoring you ;)

[@richardnedbalek1968]

@@AbBc-w4qSpare us the politics, please!

[@AbBc-w4q]

@@richardnedbalek1968 but its a good explanation of why he need not worry about being censored. Sandy is anti woke-tard. Sorry if that bothers you.

[@harrywind1870]

Would be cool if you could get your hands on the new mahle motor to see what's available for everyone to purchase and what legacy ice suppliers come up with.

[@Igors_mind]

Front park pawl, maybe for burn outs !!

[@MossMini]

Road holding weight?

[@peterbarqawi3740]

Thanks for the great review 👍 The differential case looks like fully machined. Such a waste of material. A room for improvement by going with a forged one? BTW what is the helix angle of the rotorshaft gear?

[@worekarolis]

Kevin Itself :)

[@Jkauppa]

complex metal parts (chromium/titanium) electroplating/forming from/on-top-of fast cast plastic mold structure (graphite rubbed/coated for conductivity for the metal growth bath)

[@Jkauppa]

low temp process (room temp electroplating), low temp cast (plastic base parts cast around 200C)

[@Jkauppa]

like a full chassis up half (bottom removed) cast mold, electroform a full exact shape, detach the metal, electroform a next one, exact control of the layer/metal thickness, multiple molds at same time electroform in the growth bath/vat (multiple vats)

[@Jkauppa]

public domain no restrictions full process, works for wood base molds too (charred to conductive graphite on top)

[@Kaatkakes]

Wooooowwwww. I just drove by your Tesla in Michigan Omg 😅!!! Hiiiiiiiiiiii

[@MunroLive]

👋

[@oisiaa]

What does this say about the state of GM's engineering talent?

[@gregbailey45]

It's beefy.

[@stevebakker6884]

Guys, seeing another Munro motor teardown reminds me of a longstanding question that I posed to Sandy a few years ago. It is; Have you ever see permanent magnets imbedded in the STATOR of any EV drivetrain motor you have torn down? thanks!

[@benc5190]

Magnet would have to physically turn around at the same speed/frequency of the magnetic field. Otherwise it would break the motor and be counterproductive.

[@stevebakker6884]

@@benc5190 It's actually been done in the lab successfully. I read a white paper on it a few years ago. It produced a power gain. Hsve been waiting to see if it would show up in production motors.

[@benc5190]

@@stevebakker6884 For a motor, or a generator? Was it a squirrel cage rotor like we usually see? Anyway you could post that white paper you found?

[@stevebakker6884]

@@benc5190 Let me look around for it. This was for a motor.,

[@vidznstuff1]

Motor would need brushes or slip rings with coils on the rotor, so no...nobody is that dumb.

[@wtmayhew]

Keep in mind that lean design is not cost free. If only a few thousand Hummer EVs are going be manufactured, it doesn’t make sense to burn a bunch of engineering time and money just to say you’re assembling efficiently. The prospective customer of the Hummer EV beast probably isn’t the sort to worry if every foot of distance is eked out of every KWH.

[@amazeddude1780]

Just an observation regarding shock loads. Since they are usually short duration, wouldn't using rubber drive cushions, much like what is done in the rear hub of motorcycles be a viable solution?

[@KiwiMechEng]

Half axle shaft torsional flex?

[@gregbailey45]

I doubt they'd last very long.

[@rmkep]

GM, boldly re-blazing old trails. "You did it Mary" indeed.

[@GdaySport]

Surprised to see GM Hummer has a pin type drive unit

[@bahamatodd]

Basically expected to be that beefy for something like the Hummer or the Silverado with 20k pound towing capacity.

[@phillyphil1513]

re: "the Silverado with 20k pound towing capacity". bingo, as seen at the GM display at this year's ACT EXPO it's sized for commercial and fleet use, yes and that early announced 20k towing rating target (which is more than 2x the Gen-1 Lightning's tow rating). don't forget the recent announcement that the WT will have an available 246 kWh battery. for reference that's only 18 kWh less than what Volvo uses in it's base model Class-8 electric VNR truck (264 kWh).

[@ClockworksOfGL]

Not sure why they’d need to cool the rotor. Induction motor rotors carry a current, which is why they sometimes need to be cooled. But as far as I can tell, this rotor is only magnetized and there’s no current generated.

[@mikenewman4078]

@Bryan Noga, cooling to keep the magnet temperature below the Curie point.

[@KiwiMechEng]

I was wondering the same thing. But also noted that it's a very low flow rate.

[@brianb-p6586]

There is no electrical current in a permanent magnet rotor, but magnetic losses cause heating and the rotor is surrounded by a hot stator, so the rotor still gets hot.

[@rogerstarkey5390]

Imagine the conversation.... "Hey Tesla! Want to buy the Hummer report!!?" "😂😂😂😂😂😂😂"

[@timboatfield]

Tesla isn't in the same race as GM. Elon could just call Sandy and say _tell me bro,_ and get what they need to know in about 5 minutes. The best payment would be an interview in a pop-up MunoLive set, somewhere inside Giga Texas and an interview with Elon, sitting on a bit of car factory.

[@markplott4820]

MUNRO live - MOST Vehicle OEMs and Auto Mechanics , Do Not recommend use of park pawl as SOLO means , they Recommend Standard parking Brakes FIRST & park pawl second engaged on Hills. its even in the DMV Drivers manual.

[@rogerstarkey5390]

Shouting at the experts? . Really?

[@markplott4820]

@@rogerstarkey5390 - I forget YOU are even still ALIVE or relevant anymore.. lol 🥵

[@DavidJohnson-tv2nn]

Not surprised that companies like Tesla omit safety systems like the parking pawl!

[@peachezprogramming]

Did bro just quote Thanos lmao

[@tobias..6688]

Algorithm 🚀

[@FrunkensteinVonZipperneck]

Al got rhythm, Al got my girl...

[@tobias..6688]

@@FrunkensteinVonZipperneck Im not a bot!😁Just want to support the channel via the algorithm

[@timboatfield]

@@tobias..6688 I think it was a joke 🤔

[@tobias..6688]

@@timboatfield Thanks for reminding me ;-)

[@kaya051285]

Why aren't two smaller motors used for each of the two rear wheels (or one motor per wheel for 4 wheel drive) rather than one bigger motor and all the additional weight to transmit that power to two wheels I'm not saying they should do this and i know better. Clearly they know better but im just asking why is it better to use one motor and split its power and torque to two wheels Or have i just answered my own question. If you habe one 200HP motor you could theoretically send any ratio to either wheel but with two 100HP motors youd have max 100HP on one wheel is that the reason Just like the idea of having 2 or 4 smaller motors for redundancy you could lose a motor and still function fine

[@xxZerosumxx]

The more motors they have the more cost goes up.

[@kaya051285]

​@@xxZerosumxx Are two 50HP eletric motors more expensive than one 100HP eletric motor? I assumed it was a relatively linear cost per HP

[@rogerstarkey5390]

@@xxZerosumxx The more the redundancy "goes up" The more opportunity for range optimisation (Semi says "hi") The greater the range gain from cruising on one motor, the smaller the pack can be. Etc.

[@tesla_tap]

@@kaya051285 Two vs. One requires two inverters, double the HV electrical connections, and some very sophisticated software to keep it all working in sync, except when turning where the software has to act like a differential. Still it can be done for specific applications. Tesla Plaid and Semi use three motors (one up front, two in back), and a few others manufactures do this as well. For example, the Remic Nevera uses 4 motors, one on each wheel and costs $2.2M.

[@kaya051285]

@TeslaTap but those things are modular. That is to say does two 50HP inverters cost more than one 100HP inverter Does two writes able to carry the current for 50HP cost more than one wire carrying 100HP etc

[@JeromeDemers]

They ship 2 hummer per quarter. They have time when inserting stator into housing to prevent those metal shaving. 😝

[@zodiacfml]

fan boys keep bashing GM and the Hummer EV. It is decent. It appears they designed, manufacutre, sell the Hummer EV to gain experience on making more electric trucks/SUVs

[@tianjohan4633]

Can you say anything about the thickness of the laminates? Iirc the thinner those laminates are the less eddy current will occur, making for a more efficient motor. From varies charts I've seen the Hummer EV is about the least efficient EV on the market. Where did they drop the ball? What extra mile was dropped to save money or to time?

[@vidznstuff1]

Dude - it weighs 9000lb and is an aero brick. Nothing to do with laminate thickness.

[@godofdun]

Beefy!

[@rogerstarkey5390]

LARDY!!

[@GilmerJohn]

Well, perhaps GM should heat the housing really, really HOT and really, really, cool the stator when arranging a "interference" fit. LN2 is cheap!

[@RayNLA]

The Hummer EV…The answer to a question no one asked.

[@shazam6274]

Kinda looks more and more like the Hummer was designed with a military customer in mind. Complicated, hard to build and maintain, and expensive!

[@jg5001]

I mean, the old Hummer is the Hmmwv that was built on a military grade contract from none other than GM (AM General). . . I'm no 91B, but I've helped fix a lot of our NMC trucks.🥲

[@vidznstuff1]

What are you maintaining? I doubt you can buy any of the guts.

[@DaBooster]

Is GM manufacturing this drive unit themselves or are they buying it from a third-party?

[@simson4t]

They manufacturing it and it’s their own design. The ultium platform based on three different stators, used in six or nine Drive units.

[@phillyphil1513]

because: Ultium.

[@clemfandango4219]

Those coolant pumps are sexy, and yet you didn't mention them.

[@KiwiMechEng]

Yeah, they should have, along with filtration in more detail.

[@antoinepageau8336]

Giant metal shavings at the bottom of the oil pan on an EV from GM… yeah, that sounds about right

[@KiwiMechEng]

That's what the filter is for.

[@antoinepageau8336]

@@KiwiMechEng I know I'm just teasing. Still those are ridiculously big shavings and I suspect someone at GM will get a talking to.

[@williamscoggin1509]

This is video alone helps explain why the new EV Hummer has so many problems that the owners announced in their videos. And explains why they only sold what was it two Hummers in the last quarter? Thank you for not pulling any punches when braking this truck down from the battery pack on. 👍🏻

[@raydawson8904]

Too much advertising for me in this video.

[@TimothyHayes-o9g]

This begs the question, why is GM wasting so much energy, natural resources and human resources on a bloated 9000 pound offroader that has no reason to exist in this world?

[@rogerstarkey5390]

Because they can't do "reasonably light and relevant"?

[@KiwiMechEng]

The American consumer unfortunately.

[@bwoodside1993]

Maybe some of the viewers can help me with this question. How do they avoid electrical problems with all the conductors? Steel,aluminum,copper and oil to cool pieces in contact with high voltage? It’s a basic question that I’m sure is obvious to some but not this guy.

[@KiwiMechEng]

What problems were you expecting? I'm not seeing any issues myself.

[@markoverton5858]

Very interesting GM is trying it’s late to the game it once ruled, I wish them well 👍

[@ruftime]

9000lbs! 30 inches longer than a Hummer H1 and 1000lbs heavier……GM leading the way😂

[@FrunkensteinVonZipperneck]

If GM makes a 13,000 lb MAGA Model, suckers will line up... Heck the FBI will buy out the first 4 years of production.

[@4literv6]

With what 3x the power? 5x the efficiency, 2x the performance&top speed, 10x the daily drive ability and total comfort? And inflation adjusted it costs LESS than an h1 did! 😎

[@bob15479]

My civic can lock all 4 wheels. (Parking brake + in gear) not being able to lock all 4 wheels on a massive off roader would be unconscionable.

[@ChaimLoecher]

So a fully loaded 80,000lbs Tesla Semi Truck using Tesla drive trains from a modelS is.... underkill 😂😂

[@4literv6]

Not even the s large drivetrain unit's, the semi uses model 3&y sized motors x3. 😀 Also spacex uses tesla motors and pack's to.

[@rogerstarkey5390]

@@4literv6 Unless I'm mistaken, the basic cross section of the rotor/ stator diameters is the same, it's the housings and "gear assemblies" (can we call them "gearboxes"?) which are different (with the decoupling system in the Semi) Add the carbon wrap in the S/X (and Semi?) Now we have the hairpin windings to consider. . I think we'll likely see a combination of core motor components in the CT, Probably with a variant of the Semi decoupler for towing/ cruising range. (Franz said "range isn't a problem" [paraphrased] in his recent interview) . I'll *certainly* need 🍿 for that one! Edit The Semi was GOING to use M3 motors as the basis. I suspect that changed when the plaid drive meant they could drop to 3, with the decoupling system.

[@airheart1]

@@rogerstarkey5390 exactly. The semi does NOT use model 3/Y motors. As for the gearing.. no one will know until one is torn down. But the Semi was specifically stated as changed to the S/X’s plaid motors.

[@airheart1]

@ChaimLoecher I’m sure you know everything about the Semi and how well or poorly it’s designed and that all the companies that put in orders know less than you about it.. 😂😂😂

[@4literv6]

@@airheart1 the plaid model s&b both use model 3/y sized motors just with carbon wrapped rotors allowing for 20,000+rpm. 👍🏻

[@phillyphil1513]

the value of a parking pawl is READILY APPARENT to anyone who's seen videos on KZbin of run away Tractor Trailer combinations when a dopey driver puts the transmission in park, climbs out of the cab, but then suddenly sh!ts their pants as the realize they FORGOT to set the air brakes as they notice a GIANT WALL of movement in their peripheral vision. (although some smaller boxes have them) most commercial diesel transmissions by the likes of Allison, Eaton, Detroit, etc DO NOT incorporate a park pawl due to the DOT safety requirements of the weight class involved... in these instances it is indeed much safer to dump air from the springs brakes which (analogous to certain types of relay in a circuit) operates in a "normally closed" or "normally applied" position. in this case, what it ultimately means is ENERGY (in the form of air pressure) must be constantly sent to the brakes in order for them to "back off" and the vehicle to move.

[@MetikalMan]

We talk shit on the Hummer as a product forgetting, it seems, that this will be the same damn thing under the Silverado EV. What a tragic place the automotive world is in that legislation created by morons forced morons to create this absurd product. Please can we return to a market based automotive economy?!

[@ranig2848]

GM - let's make an EV that would be as complex and as "fuel efficient" as a gas vehicle. UAW - wow - that's a great idea! we love it! this will save all our jobs! (at least until GM needs another bailout 🤦‍♂)

[@AbBc-w4q]

9000 lb good grief

[@Barskor1]

Government motors never fails to unimpress

[@aaronbounds1336]

That’s thiccness, to be clear.

[@nickmcconnell1291]

All this for a vehicle that they delivered only 2 of in the first qtr. this year!! Ridiculous waste.

[@fredbloggs5902]

And presumably one of them is this one?

[@LakeLake123]

No. All of this for the Silverado EV and Sierra EVs which will use most of these components and sell massively. They only sold two because the factory was shut down to install assembly lines for the Silverado and Sierra EVs.

[@nickmcconnell1291]

@@LakeLake123 Ah that explains the low numbers. So they are using the same components in the Silverado eh? That would explain the very low total load capacity of 1200 pounds. Munro found that the Hummer's battery pack weighed 2300 pounds all by itself... that explains it.

[@GET2222]

@@LakeLake123 you know GM was suppose to have 20 models last year, right? Nothing about the hummer is optimized for production at scale.

[@GET2222]

@@nickmcconnell1291 Exactly. The hummer is envelopes exactly what is wrong with GM through and through. VW takes 30 hours to build an ID 4 with 10% automation in an retooled old factory. tesla on the other hand, takes 8 hours to build a model Y with 70% automation and climbing. This hummer is a joke. All we learned from this year down is what not to do.

[@tarassu]

TWO parking brake calipers, electromechanicals, is enough. No need for a THIRD parking pawl.

[@richardalexander5758]

Not much in the way of innovation here. A four motor powertrain can provide independent wheel torque vectoring that Hummer's hundred year old locked differential technology can't.

[@ericplatzke]

First