Bridgestone unveils 3rd generation in-wheel motor

Tokyo -Bridgestone Corp. has unveiled the third generation of its in-wheel motor-damper system for electrically-powered vehicles. The new version is smaller and lighter than earlier designs, allowing it to be used in vehicles with rims of 14-inches or larger. The first generation would only fit into 19-inch wheels, while the 2nd generation would fit 18-inch sizes.

The latest version of in-wheel motor system uses an inner rotor type motor as opposed to an outer rotor type motor, while making improvements to several key components to realise a better system that is lighter and more compact than its predecessors, said Bridgestone.

Tyre makers are developing in-wheel motor systems to help designers of electric vehicles. These designs have the advantage that they offer excellent flexibility and increased space for passengers. On the downside they increase the unsprung mass. Bridgestone has developed the in-wheel damper and vibration compensation system to overcome this latter disadvantage.

A Bridgestone spokesman said, "At this moment, we are not in a position to make any comments on contacts from OEMs. But, it is possible to cooperate with OEMs for further development in the future." The company has previously said it is in final discussions with some oems, on the use of this technology.

Bridgestone first announced this in-wheel motor system in September 2003. Version II was announced in September 2004.