IAV says its new modular electric drive can boost range 5-10%

IAV’s new modular drive unit, presented at the recent Vienna Motor Symposium, combines an 80 kW (50 kW continuous) motor with a transmission, and can support electrification solutions in vehicle classes A to D.

Many of today’s electric drives use a transmission with a fixed gear ratio. This has the advantage of simplicity, but is not optimal in all situations. For example, hill-climbing performance and maximum efficiency demand very different transmission ratios. A fixed ratio also has drawbacks in terms of efficiency. IAV’s drive unit uses a transmission with one to three speeds, and the company says that this increases driving range by five to ten percent.

The system supports hill-climbing ability to a maximum 30% grade, and offers a top speed of 99-115 mph. It’s designed to be flexible, and can be used in EVs, PHEVs or fuel cell vehicles.

IAV’s motor generates constant torque of 150 N·m, which can be increased to 300 N·m for short periods of time. The planetary transmission, which provides a maximum of three speeds, is installed at the side of the motor and is capable of generating output torque levels of up to 3,000 N·m, making it possible to limit the motor’s maximum speed to 8,000 rpm.

“Our modular electric drive unit meets the demands on torque with more speeds than comparable solutions,” said Jens Liebold, Technical Consultant for Electromechanical Drive Systems at IAV. “Instead of a multiple-speed transmission, these use a larger motor, with means they need more package, and encounter problems because of the higher motor speeds involved, such as with noise, vibration and harshness.”


Source: IAV via Green Car Congress

  • Simone

    IMHO the Tesla dual motor approach is simpler and more efficient , every axle have a powertrain tuned for giving the best in different condition , electronic choose witch motor is running in the best range and use it as primary motor.

    • hey_ghis

      It seems the dual motor configuration allows for increased efficiency.

      Only on this aspect, what is the best solution? The one proposed or the dual motor one?

      And is it possible to have two of these solutions to combine the two? Is the overall efficiency increased even more then? Maybe it is over engineered in this possibility…

    • Ed

      Correct. It seems that the front motor on a D is optimized for highway cruise while the rear motor is optimized for acceleration. A very big benefit is in dynamic braking efficiency and tire wear by using dual motors. Tesla appears to have nailed it, with no significant advantage for multi-speed transmissions.

    • Stuart51

      Tesla only has 1 motor per axle. 4WD (Ds) have two motors; if you were to use the IAV solution in a 4WD, you would also use two motors.
      IAVs’ solution is more compact than Teslas’.

  • Vincent Wolf

    I think in future pickup trucks that are towing this is the way to go because sometimes you need a huge amount of torque to get rolling on steep hills when towing 10,000+ as many of us do. It’s difficult to find a 5th wheel recreation trailer that’s 30′ or more long under 10,000 lbs when properly outfitted. So even with 500 HP like in a Tesla model X your not going to have the ability to drop in a big boat on a steep sloping lake ramp, or tow a big 5th wheeler up 10+ degrees slopes, etc.