Holy fart Model 3 motor

Discussion in 'Model 3' started by bwilson4web, Jul 28, 2018.

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  1. bwilson4web

    bwilson4web Well-Known Member Subscriber


    Drop dead, resolver!

    A key technical part of any motor is the angle resolver. Knowing the exact angle of the rotor relative to the stator gives the motor controller exceptional ability to time the stator current to control EV operation. Looking at the Tesla resolver, a 10 lobe, magnetic sensor. This is at least a factor of five higher resolution than the Toyota, two magnet resolver.

    Bob Wilson
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  3. Pushmi-Pullyu

    Pushmi-Pullyu Well-Known Member

    Thanks for the info, Bob!

    I have to roll my eyes every time I see someone claim that any legacy auto maker could make BEVs as good as Tesla's BEVs. They simply don't know what they're talking about.

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  4. bwilson4web

    bwilson4web Well-Known Member Subscriber

    It takes a different mindset to design a successful BEV. You can't just press some traditional steel shell that is over weight and an aerodynamic blunt ended, drag queen. Every joule counts and that means the old, familiar has to be tossed. Toyota has come close but this isn't horseshoes and hand grenades.

    The Prius Prime is a clever design. Adding a one-way clutch means MG1 and MG2 work as a single motor . . . brilliant. But they keep trying to make air-cooled traction batteries. This summer I've parked the Prime because our BMW i3-REx has a liquid cooled (and heated) battery. Air cooling, you'd have thought Nissan had learned lessons with the Leaf.

    Bob Wilson
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  5. Josh Bryant

    Josh Bryant Member

    Great info Bob!

    On the cooling...

    I wouldn’t even call Nissan’s packs air cooled, because that implies there is some sort of active cooling system. They are passively cooled, sealed cells. And that is about to change with the 60 kWh LG powered pack next year.

    Does they Toyota design have an active system or just passive?
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  6. bwilson4web

    bwilson4web Well-Known Member Subscriber

    Just cabin fans that dump the exhaust air overboard. They don't even have ducting from the AC to the battery packs. They even have a lame "Would you like AC when charging?" that defaults to "No" and disappears within 5 seconds. I am disappointed with:
    • Weak cooling in hot weather - it really needs automatic AC when charging over 85F with dedicated ducting to pack.
    • Poor cold weather EV - we found several, undocumented triggers that fire up the engine under 50F.
    We have a BMW i3-REx and it has superior thermal management. Cools in hot weather and warms in cold. This is the way to go.

    Bob Wilson
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  8. Josh Bryant

    Josh Bryant Member

    Interesting. It seems Toyota is having a hard time giving up their winning hybrid formula.

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