electric hub motor question?

[johnhead]

I have a technical question regarding the concept of hub motors mounted in each individual drive wheel. I know this may not be the current design for the Vv however I'd like to know how does the the "RPM" get modified to each individual rear wheel when the Vv goes into a tight turn? For example in a sharp right hand turn the outboard wheel (left wheel) needs to increase it's speed with regards to the inboard wheel. With two wheel mounted electric motors, how is this done. I know this is easily achieved using one drive point and a differential as it is done in most automobiles.. But how to do it with individual drive to each wheel? Curious...
Thank You
John

[Miracleman89]

It was my understanding John that they used a sophisticated computer program that provides that information to each wheel. However I have heard that the outer wheel controls the speed during a turn and the inner wheel is put into a neutral drive so to speak! Anyway, I hope that helps, because I am not sure which technique VV was planning to use when they were discussing in-wheel motors.

[rogwild]

I would vote for the FIRST option (computer software control) since you would want your ABS and Traction Control to work 'especially' while turning. Only my 'thoughts' though. I sure hope Vv has a 'computer team' working very hard on all these 'problems/considerations' and don't wait until, 'they come to that bridge'!

[Lumberjack]

Actually the Split motors will by themselves resist the turn since they will want to both turn at the same speed. It is a simple matter to sense the steering wheel position and adjust the output of each wheel with a differential type circuit...Torque,inertia and normal steering dynamics will determine the rest.

[johnhead]

Thank you all for your replies. From the response I see you fully understand my concern. I will just have to see how the computed figures it out.. from the steering wheel or ??

Funny but I often "counter steer" on my motorcycle(s) to get a faster lean angle.. I hope THAT won't throw the computer into "blank screen" mode!

:confused:

[RAN]

johnhead, I'm glad you mentioned that.... I was wondering what happens tilt-wise when you counter steer in a power drift or on a slippery surface.

[Lumberjack]

Counter steering should create some very strange dynamics...I suspect it would pull the vehicle right back out of the turn and then try to reverse it. The physics of course would try to resist and might break the vehicle loose and possibly roll it....

[AZEqualizer]

And you get to throw into the facts that the rear wheels do a slight amount of steering.
http://flytheroad.com/1_18_07_post/Prop_Pod.jpg

[Derwin]

Hey, AZE, your photo is not showing as of 3:15 chicago time.

[AZEqualizer]

do a refresh and it re-shows up - I think the FTR site is having some flow problems. They need server maint ... often

[WattGas?]

I hope THAT won't throw the computer into "blank screen" mode!

:confused:

Well, It won't be running any Microsoft products, so that shouldn't be a problem...

:LOL:

[MVRacing]

AZE,
Where'd you get that photo? Any more available? Purple is the tilt cylinders, and on the left the electric drive motor, white square in front view is a radiator, green is shocks ... correct so far? I assume the blue is the ICE and black box ... fuel tank?

[Mark Tomlinson]

AZE,
Where'd you get that photo? Any more available? Purple is the tilt cylinders, and on the left the electric drive motor, white square in front view is a radiator, green is shocks ... correct so far? I assume the blue is the ICE and black box ... fuel tank?
Ian posted the picture here http://flytheroad.com/blog/forums/topic.php?id=524&replies=193. It's near the end of the page.

You are correct about the colors and placement. The black box could be the fuel tank. But I think it may be the motor controller, they'll need some sophisticated electronics. Another photo on that page shows a couple of black boxes that need to squeeze in there. A side view from that page doesn't give much more help.
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