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[shayan]

https://www.engineering.com/ElectronicsDesign/ElectronicsDesignArticles/ArticleID/20546/Two-Motors-in-One-Intelligent-Controls-Efficiently-Deliver-Torque-and-Speed.aspx

[Fran K]

Article says they are partnering with Zero motorcycles.  Article says a few other parterning entities,  I searched out Clean Seed mentioned on the Agriculture sector.  Pretty specific product to seed plowed up vast flat soil from what I found.  I want an electric category 2 utility tractor more than an electric motorcycle, really seems sensible if one has a few tractors, not aware of any yet.

[NEW2elec]

Very nice.

With use with motors or generators that could really up the regen as well.

Fran K here's an electric tractor for ya and it's autonomous.

[Crissa]

The new Ford has seven motors so this technology would save alot of wight over that sort of design.

-Crissa

[shayan]

The new Ford has seven motors so this technology would save alot of wight over that sort of design.

-Crissa

Right, isnt it the weight of the additional controllers as well and not just the motor itself? I guess they would've weighed the trade-offs well enough to make that design choice. Dual motor with a low rpm torque and a high rpm torque certainly makes sense. Its kind of having a implicit gearbox.

-Shayan

[Crissa]

Well, every motor would need a controller.  And every motor needs a clutch or drive system or some way not to provide drag...

So this multi-wound motor thing is pretty cool tech.  The moment I heard it called coil drive I knew that's what it was.

You can probably even re-use some of the components in the motor controllers since you're just pathing the pulses differently inside the motor; you don't need an entire other controller for each mode.

Tesla so far has done it by disengaging a motor electronically at higher speeds so that it's more efficient; but the tri-motor works differently.

Anything to be lighter on a motorcycle, tho.

-Crissa

[stevenh]

Very simple concept.  It will be interesting to see what configurations of series-parallel windings make the most sense for Zero's usage model.  Seems like it would just be another level of switching on the controller, since most probably use parallel switching/drive elements anyway, that may not really increase the size/weight much if at all, just some additional cabling.

Steve

[Fran K]

The new Ford has seven motors so this technology would save alot of wight over that sort of design.

-Crissa

I assume you are refering to just an engineering exercise, one of two 1400 hp versions that look like the electric mustang coming to market soon.  I think it (the 7 motor variant) is supposed to do tricks and smoke shows showing off the potential with modern technology.

[Fran K]

Fran K here's an electric tractor for ya and it's autonomous.

Wow thanks,  that is beyond category 2 and won't fit any of my implements.  Preferable color though.

[Shadow]

Now You Know interviews Josh Zobell CCO of Exro dated 9th August 2020. Runtime about 30 minutes.

Not sure was this posted before? Best overview of Exro for non-techie. Also contains a shameless plug for their publicly traded stock symbol.

[gregj]

From what I can see , the ICE analogy is a variable cams profile.
This seems to also make a great tech for off road vehicles.

[Curt]

It will be interesting to see what configurations of series-parallel windings make the most sense for Zero's usage model.

Better wheelies off the line AND at speed!