In-wheel motor systems enable improvement in energy efficiency of vehicles as well as enlargement of indoor space, because the traditional power train can be eliminated. However, this system causes increased unsprung-mass of the vehicles, therefore road holding performance and ride comfort of the vehicles will be reduced. To overcome these disadvantages, a new type of in-wheel motor system using dynamic damper mechanism has been developed. A vibration model was developed in which the basic structure is the same as that of IWM-EV and the unsprung mass does not increased. The model is realized by adopting an in-wheel motor with a dynamic damper, in which the motor is attached to unsprung components via a specialized spring and a damper and the motor itself can function as a dynamic damper. By adopting this mechanism, the unsprung mass becomes approximately equivalent to that of Conv-EV; furthermore, without increasing the total vehicle weight, a dynamic damper effect can be obtained owing to the addition of 30kg equivalent damper mass. Hereafter, this mechanism is called the advanced dynamic damper motor (ADM), and a vehicle with ADM is called ADM-EV. An ADM structure in which the motor is used as a damper mass was adopted. As a result, contact force fluctuation at approximately the unsprung resonance can be decreased when driving on a bumpy road, leading to an increase in the contact force characteristics of the tire. Owning to the vibration suppression effect of ADM, vertical vibration when driving on a bumpy road decreases, leading to improvement of ride comfort. With the ADM structure of the motor being elastically supported, the weight burden to the motor was eliminated and vibration input to the motor was suppressed. The in-wheel motor system developed in this study was the first prototype and weight reduction was not taken into serious consideration. In the future, simplification and weight reduction of the entire system, including components around the steering wheel.s components, will be carried out to further improve the performance of the vehicle.
Development of an in-wheel motor system using dynamic damper mechanism
Entwicklung eines Radnabenantriebsystems mit dynamischem Dämpfungssystem
2006
12 Seiten, 11 Bilder, 3 Tabellen, 2 Quellen
Conference paper
English
Development of an in wheel motor system using dynamic damper mechanism
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