Nissan LEAF 100% Torque – Video


Nissan México recently went back to some EV basics on electric cars – the torque.

Torque, which translates into the force responsible for acceleration of the vehicle, is available from zero rpm in electric motors.. Typically, maximum torque is available in a range of up to several thousand rpm, depending on the motor type (well, maybe there are some torque limits at 0 rpm so as to not damage the drivetrain with torque surge, but this is mostly imperceptible and you feel instant maximum force pushing you forward).

In the case of the internal combustion engine, even at 1,000 rpm (slightly above idle speed) there is usually only 30-40% of the torque available according to Nissan and then – when you accelerate – the curve isn’t flat. So, you mask that curve with a gearbox, but still the effect is way behind the perfect motor – the electric motor.

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16 responses to "Nissan LEAF 100% Torque – Video"
  1. Spin says:

    Why haven’t we seen any stories about the Crossvolt in the last few days? Can we expect to see it at the Detroit show?

  2. Lad says:

    What is more interesting is not this Nissan PR video on torque; but, an actual torque curve based on amplitude and rpm. In the case of the 2011 Leaf the torque remains about the same value until about 3,000 rpm when it quickly starts dropping off because of eddy currents and the reverse EMF. another interesting thing about electric motors is if you increase the voltage the torque stays constant out to a higher rpm but the amplitude decreases starting at stall speed.

    The drop off of torque at the higher rpms explains why EVs run out of grunt.

    1. Djoni says:

      And 3 000 r.p.m is obtained at what speed?
      This is were many trick can come to mind to overcome loss of torque.
      One is a star/delta winding controled by the EMI or/and the differential r.p.m of two sets of motors for front and rear drive train, as the Tesla D use.
      No to say that with EMI you can really crank up the frequency and modulate the wave to reduce the losses.
      Anyhow, electric motor are much closer to the perfect engine.

      1. LuStuccc says:

        Psst! Jean, c’est “where” pas “were” . Were est le verbe être à l’imparfait.

        1. Djoni says:

          Zut! Pas de correcteur shakespearien!
          Merci Max!

          1. Lustuccc says:

            😉 De rien!

    2. bRad says:

      Interesting about torque v. voltage, Lad. The amplitude of what decreases?

  3. ModernMarvelFan says:

    Pointless to use the torque rating without providing gearing ratio…

    LEAF is quick off the line but runs out of power very quickly around 35-45mph and fairly slow getting to 60mph…

    1. JP White says:

      Reliable multi-ratio gearboxes have yet to be developed for EV’s. The electric motor provides so much torque they tend to strip gears.

      Tesla had to abandon the 2-speed gearbox for the Roadster back in 2008 because of reliability issues. The Model S is single speed as well as are all modern EV’s.

      Once developed, I agree that a reliable multi-speed gearbox will overcome the reduced power at higher speeds for EV’s. The drop off in my experience isn’t that bad. I can still accelerate well at 70.

      1. ModernMarvelFan says:

        “The electric motor provides so much torque they tend to strip gears.”

        ABsolutely BS. The biggest scam lies in the world. The only thing is affordability and cost. EVs don’t need 5 or 6 speeds. A 2 speed is plenty. Roadster actually has way less torque than the Model S. So if a one speed can handle it, which part of the gearset can’t handle it if it is 2 speed?

        Tesla is already 9.74:1 in gearing ratio. How much more do they want?

        It is a bad engineering to claim that gears can’t handle it when the 9.74:1 ratio is already producing over 4,000ft-lbs of torque.

    2. colliera says:

      Want to get around that? Let off the acceleration when the torque starts to flatten and then floor it again. Since you are then in a rolling coast with speed the torque it starting from zero again plus your coast speed. This is repeatable until you hit max speed. Sort of like acceleration of a RAM Jet.

      1. ModernMarvelFan says:

        absolutely ludacrius…

        Makes absolutely no difference…

        1. colliera says:

          Apparently you have never even been in a LEAF. I own one and can do this any day of the week.

          1. Djoni says:

            Probably so as I do think it doest that in mine.
            But it might has more to do with the controller and BMS than the motor.

          2. ModernMarvelFan says:

            Apparently, you got no clue on how things work. No wonder you bought a LEAF.

            I have driven the LEAF plenty of time and each time it just confirms my suspicion.

            “Since you are then in a rolling coast with speed the torque it starting from zero again plus your coast speed”

            That is absolutely BS. The reason the power drop off in the LEAF is due to its motor and motor drive voltage. AS motors spins, the back EMF limits how much current you can crank into the motor. So, as soon as you connect the power back the motor, the spinning of the motor will limit the power it can pump out due to the battery voltage. The battery voltage limits how fast the motor can spin.

            The ONLY possibility that what you described can be remotely true is if the motor drive limits the current to the motor due to Heating issue or the battery can’t sustain the power drain due to heat issue (likely). If that is the case, then the LEAF is EVEN WORSE than I imagined.

            Plus, when you let off the power, the acceleration is already slowed, thus even slower speed between 30mph to 60mph acceleration.