Iwanaga The new movement in automotive technology called CASE* has created a push in the automotive industry to electrify the constituent components of each sub-system in vehicles. Among the various types of EV, which include fully-electric vehicles and plug-in hybrids, there is one common challenge: consumers want to be able to drive longer distances on a single charge. Maximum range depends on vehicle weight, efficiency, and battery capacity. Accordingly, a key task for the industry is to downsize components, thereby reducing weight or creating space for additional battery cells. The motor is no exception. By reducing the size of the motor, the vehicle becomes lighter, and it can travel farther using less power. However, when you shrink the size of the motor, it cannot produce the same amount of power if it keeps rotating at the same speed as before. So as the motor gets smaller, the only thing that we can do to maintain power is to increase the rotational speed. Not only does this require us to reduce the size of the bearings and other components used inside the motor, but it also requires the components to be able to handle rotation at much higher speeds.
*CASE: Connected, Autonomous, Shared & Services, Electric