抄録
High performance direct drive system was developed for the new concept electric vehicle "KAZ". Direct drive system, so called wheel hub motor, features high efficiency of the power during transfer. The problem of a direct drive system is the heavy unsprung mass. For this situation Tandem suspension system was invented for this direct drive system and "KAZ" was produced as an 8-wheel aud an au wheel drive vehicle. Electric motor was improved to be light in weight as a result of high revolution speed, strong magnet, and concentrated coil winding. This 8-wheel drive system achieved 311 km/h in a maximum speed and 15.3 seconds in 0 to 400 meter aoceleration performance.
