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Tesla has produced three models, each with radical technology, Model 3 also??

Discussion in 'Model 3' started by Peter Egan, Dec 14, 2015.

  1. Peter Egan

    Peter Egan Member

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    #1 Peter Egan, Dec 14, 2015
    Last edited by a moderator: Dec 30, 2015
    The Roadster had a radically large battery. Model S was the first EV optimised car with underfloor battery, compact motor layout, the big driver interface screen and autopilot. Model x delivered the Falcon wing doors, large windscreen, novel second row seats and chemical warfare quality air filter in a package that builds on the Model S.

    Lower price M3 cannot just be smaller without the expensive bits of MS and MX. It will surely have something radical - and not just in body design.

    Going from two motors to four would be a radical change. A smaller, cheaper car will surely offer less horsepower. SpaceX uses nine small rockets in its Falcon 9 first stage. Why not a 70 to 100 h.p. motor and transmission for each wheel? Each corner of the car could have drive-by-wire controlled steering, suspension, motor/transmission (planetary gears) and brakes - see image.

    Autopilot would have an easier job of parking the car in tight places. The vehicle assembly task is much easier. Also, the car could have a single control box for the autopilot, battery, lights, navigation devices, airconditioning, motors, steering, suspension settings, brakes, door handles, windows, etc., that interfaces with the screens in the cabin. All the cables and tubes would simply plug into it for easy installation and replacement. The car would still need a steering wheel connected to the front wheels.

    Once the body was built, it would simply be a matter of bolting on the four drive units, the battery, the control unit, and plugging all the lines into the control unit. The factory robot count could be halved compared to the MS and MX.

    Combined electric motor transmission disc brake suspension and steering unit with rotating parts.png
     
  2. jerjozwik

    jerjozwik Member

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    that would be a heavy ass wheel.
     
  3. RDoc

    RDoc S85D

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    Yes, putting the motor in the wheel is probably not a good idea as it would make for a rough ride and poor handling due to high unsprung weight.
     
  4. Colsla

    Colsla Member

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    Maybe you wanna google Rimac :) an all electrical from Croatia that has 500km of range and has 4 motors that control each wheel just like u said. I am on my phone so I can't link anything but it is pretty much what you wanna see in model 3
     
  5. S'toon

    S'toon Knows where his towel is

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    Costs $980,000, and a grand total of 8 have been made.
     
  6. Colsla

    Colsla Member

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    Yup..
     
  7. stopcrazypp

    stopcrazypp Well-Known Member

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    You can add the Mercedes SLS AMG Electric Drive in there too. ~$250-500k depending on where you look, but not sure they even sold one of them.
     
  8. Peter Egan

    Peter Egan Member

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    Some of the major Tier 1 suppliers to the auto industry have development versions of drive units like this. It requires a bigger shock-absorber for the extra weight - extra weight is closely related to power of the electric motor. Tonnes of power being a feature of Tesla EVs, its a more difficult task for them, but it is a company that exists to innovate.
     
  9. FlatSix911

    FlatSix911 918 Hybrid

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    The evolution continues ...

    IMG_0022-750x563.jpg
     
  10. Model 3

    Model 3 Active Member

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    There is 2 here in Norway.
     
  11. AustinPowers

    AustinPowers Total Smeghead

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    #11 AustinPowers, Dec 15, 2015
    Last edited: Dec 15, 2015
    But though the SLS ED has four motors, they are not in the wheels:

    slsed.jpg
     
  12. Spidy

    Spidy Member

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    Look up the top Formula Student Electric teams, many of the top teams have the motor in the wheelhub. But the power is obviously much smaller. And I think all teams that do it that way always have 4 wheel drive.

    Formula Student Electric - World Ranking (click on onFSG)

    chassis-with-open-battery-compartement.png
     
  13. Whitmarsh

    Whitmarsh Member

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    I assume the title of this thread should be 'radical', not 'radial'.
     
  14. snellenr

    snellenr Member

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    Protean Electric has been trying to make a go of the "wheel motor" concept for a while. Not sure how they're doing these days -- they'd had some financial issues.

    Protean Electric | Protean Electric
     
  15. ScepticMatt

    ScepticMatt Member

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    Exactly. You want the wheels to be as light as possible to have an effective suspension. Alloy wheels were introduced to reduce wheel weight and improve heat conduction.
    Now you want to put a hot and heavy motor inside the wheels? Makes no sense in a performance car.
     
  16. stopcrazypp

    stopcrazypp Well-Known Member

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  17. Peter Egan

    Peter Egan Member

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    Never has a picture so well told a story

    - - - Updated - - -

    Very impressive Works best with 4 wheel drive - smaller motors and max regen.

    - - - Updated - - -

    Yeah!! Didn't see the mistake when I wrote it.
     
  18. vwtodd

    vwtodd Member

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    The idea of 4 motors is great and potentially viable for all of the reasons you stated in the original post, but if this happens, it will almost certainly not be in-wheel motors. The unsprung weight kills handling, and to an extent, reliability, as the entire mechanism is exposed to all the major an micro jarring motions of wheel travel. Much more likely that they are placed within the chassis. A move to a fully modular, "Lego-like" if you will, assembly would reap huge benefits.
     
  19. Lonnie123

    Lonnie123 Member

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    #19 Lonnie123, Dec 17, 2015
    Last edited: Dec 17, 2015
    The point of the model 3 is an affordable, reliable, mass appeal EV. I may be ignorant here but it seems like this needlessly increases complexity and cost in a car that is supposed to be somewhat economical and reliable, right? 4 motors seems like it would be at least 4 times as complex and certainly somewhat more expensive as a single motor (the current D models are $5,000 more than the single engine models)
     
  20. aronth5

    aronth5 Long Time Follower

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    You're right of course but don't worry between now and the reveal there will be countless suggestions which will add complexity and won't be implemented. All part of the fun as we wait a few more months.
     

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