Mitsubishi Motors Corporation and Tokyo Electric Power Company have jointly developed Mitsubishi Libero Electric Vehicle (EV). In this vehicle, an excellent driving performance was obtained by not only increasing the maximum output of propulsion motor but also providing motor characteristics matched with Libero-EV itself and by reducing the various losses. The following measures were taken for improving the propulsion motor performance: An alternate current (AC) induction motor was adopted to avoid the brush loss and to obtain the sufficient output power in higher revolution speeds. The output torque in low revolution speeds was enhanced by adopting a vector control method. The output torque was increased by reducing the distance between the stator and the rotor. An electric current control algorithm was developed to maximize the output torque in the normal temperature range of 60 to 80 deg C for stator coil operation. As the result, superior maximum vehicle speed and acceleration speed, which are the highest level among the EVs in practical use, were achieved without increasing the size of motor. In addition, though generally the efficiency of AC induction motor is inferior to synchronous motors in lower output level, lower energy consumption was achieved by reducing the total road load and by adopting highly efficient accessories such as a heat pump air conditioner and a power steering directly driven by an electric motor.
Driving performance improvement of the electric vehicles
Verbesserung der Fahrleistungen von Elektrofahrzeugen
EVS, International Electric Vehicle Symposium, 12 ; 1 ; 101-110
1994
10 Seiten, 6 Bilder, 3 Tabellen, 2 Quellen
Conference paper
English
Driving Performance Improvement of the Electric Vehicle
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