Tesla semi

[vvanders]

<insert joke about throwing gasoline on the fire>

Anyway, getting back on topic.

From my understanding(which I'm sure is not complete), power to three phase motor is a function of how much current the wires can sustain(aka heat dissipated from resistance) and physical strength.

Tesla moved to a single-gear transmission from the Roadster because it turns out electric motors are really good at shredding transmissions.

 

[California]

Tesla moved to a single-gear transmission from the Roadster because it turns out electric motors are really good at shredding transmissions.

But - wouldn't a heavy truck need compound gearing at least to get started out of someplace that is such a difficult start that it is at the limit of (good) traction? Huge torque is great but multiplying it with gearing seems like it would still be needed in some cases, similar to present two-speed axles that are used to get started moving. Anybody know?

 

[TemporaryKubotaOwnerMark]

just think of all that methane, pretty explosive I hear...
I think Bessie gets a pass here.

Hmmm. Bessie gets a... pass?

That might be an unfortunate choice of words....

 

[cqaigy2]

But - wouldn't a heavy truck need compound gearing at least to get started out of someplace that is such a difficult start that it is at the limit of (good) traction? Huge torque is great but multiplying it with gearing seems like it would still be needed in some cases, similar to present two-speed axles that are used to get started moving. Anybody know?

I don't think locomotives have gear boxes, so probably not?

 

[vvanders]

But - wouldn't a heavy truck need compound gearing at least to get started out of someplace that is such a difficult start that it is at the limit of (good) traction? Huge torque is great but multiplying it with gearing seems like it would still be needed in some cases, similar to present two-speed axles that are used to get started moving. Anybody know?

I'd be pretty surprised if that was the case.

I know on our Tesla I can go from about couple hundred watts, which is about as much as you'd get from hopping out and pushing up to ~450hp(~325kW) seamlessly.

The P90DL I had as a loaner(~700hp) was exactly the same. I think as long as they have enough resolution in the PWM portion of the power circuit it shouldn't be an issue.

 

[toppop52]

I am guessing the dealership burned down because of all the gasoline in cars. It might started as battery short but without gasoline it would be no event.

You壇 lose, the battery fire spread to the workbench, where it got into the parts washer then the bulk oil tank for the furnace. And is didn稚 burn down, it was extensively damaged though, due as much to smoke and water as fire.

 

[toppop52]

Just observations made from the passing summer groups of riders.

Cool; you're right, I don't know what it is. Comfort & enjoyment does come into my realm of feeling good though.

Got some sixty year old scars that may mean I went through a cool stage though.

You and I both my friend! :drink:

 

[toppop52]

I think electric road tractors are an excellent choice, the rate we are advancing, they will soon be cost effective.
Don’t misunderstand my questions and devil’s advocate tone, I think the future holds many forms of power. I just want them to stand on their own without artificial price fixing at taxpayer expense, and I want people to admit their many shortcomings, internal combustion, fusion, fusion, wind, all have their problems and safety concerns, so to do EV’s. Once we admit and recognize that, the sooner we advance.

 

[3 Horse Ranch]

It takes a lot of power to keep 40 tons moving at 60 mph up and down hills bucking all that wind resistance for 500 miles a day. Not to mention trucks that are sleeper teamed that basically never stop moving except for fuel, meals and showers. The truck I last drove had a display that showed percentage of power used, it rarely dropped below 50%. Granted it was pulling 105,500# and was not designed to be aerodynamic. Still, it was constantly using 300+ hp just to move up and down the freeway. Average fuel milage was 4.1 mpg. Eighteen tires on the highway is a lot of friction to overcome, mine had 28, hence the milage. Battery technology hasn't progressed far enough yet, give it another decade or so.

 

[California]

Tesla I can go from about couple hundred watts, which is about as much as you'd get from hopping out and pushing up to ~450hp(~325kW) seamlessly.

Ok, full torque from zero rpm doesn't need to be multiplied to get a lot of weight started moving.

Thanks! I just learned something new.