Why two motor types in CyberBeast?

[tmeyer3]

I tend to ignore threads about speculation, complaints, and 1-upping each other. But then @CyberGus comes around and makes my day ?

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[CyberGus]

I tend to ignore threads about speculation, complaints, and 1-upping each other. But then @CyberGus comes around and makes my day ?

I’m just here for the memes

 

[GhostAndSkater]

So are you saying that the losses through the laminations are there regardless of if torque is commanded or not?

Yes, those are the core losses, and are split into Eddy losses and Hysteresis losses. The first is due to the change in magnetization on the steel laminations, and the second is due to induced currents due to the changing magnetic field

When joined, they are proportional somewhere from the square to the cube of rpm. Doubling your motor speed quadruple to triple the core losses

Induction motors also have those, but only the motor in active and has a induced magnetic field on the rotor, else the losses becomes just the gears, bearings and windage (air friction on the gap between rotor and stator), which are considerably smaller

I'm looking forward to figuring the gear ratio of the reductions, because I think this is one of the reasons they went with induction motors, they have a bigger gear ratio since top speed is lower, and when towing have loads the motors will have a higher average power at lower vehicle speed compared to a Model S/X, meaning the motors would spin too slow and operate inefficiently

So you increase your gear ratio, but then your core loses grow fast due to the square to the cube relation

The Semi is similar, the two acceleration motors have a considerably more aggressive gearing, with a whole other gearing stage, because they need the power and also inductions motors wouldn't cut there

In flat cruising engaging permanently the acceleration motors with the more aggressive gearing would results in too much losses

 

[C T Rick]

I tend to ignore threads about speculation, complaints, and 1-upping each other. But then @CyberGus comes around and makes my day ?

What Cybergus didn't mention is he too was at the after party. He clearly must have bumped into the cybergirls , unless he was standing in the corner.

What's cool was they were there for the party and passing out cybertruck pins.

Notice who signed my pass?

Rick

 

[scottf200]

FYI, Tesla has had combinations already. See the chart I put together.

One aspect: It does appear that permanent versions allow them to regen down to 0 MPH. My 2017 Model X with two inductions does not (regens to like 3 MPH).

<snip>

Updated my chart for the CT

 

[SentinelOne]

anyone have anymore info or thoughts on this? I have an m3p with rear pmm....aka primary drive in rear - not the best in the snow as delay before front kicks in...

Since I have the CB on order, thinking might be some improvement in snow given the pmm is in the front aka front wheel drive to start off under mild accel

And think the gearing is 14.5:1? Not sure how that compares to other teslas

 

[Saygmo]

This is pretty much the best answer.. the engineer I spoke with said that to get the best efficiency having induction in the rear was the best scenario with also being cheaper to manufacturer. I wonder if the semi will eventually do this vs having the clutch system they currently have.

On the note about the EPA application...it also states the battery pack is 150kw. When Elon said 123kw battery is that the current usable? Seems like a lot more range is unlockable in a future update.

Yeah, I’m really concerned Tesla saves money manufacturing a vehicle that costs $30k premium over the original try motor, or even the extra $20k it costs over the awd.
but sure, being fwd or rwd is fine under light load, and it actually occurred to me that since the beast will be harder on rear tires, it might balance out a bit having the front tires driven while under cruise.

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