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Japan: Mitsubishi shrinks EV engines

Mitsubishi has announced a new electric motor that could shake up the green car industry in a good way.

The auto manufacturer recently released news of a prototype electric vehicle motor system that features a built-in silicon carbide inverter, making the system smaller and lighter than earlier versions and potentially improving vehicle energy efficiency.

The car company says its latest innovation will give automakers the ability to develop electric cars with greater passenger space as the new built-in inverter (the electrical device which converts direct current to the more manageable alternating current) is designed at only half the dimensions of their current electric motor system, which comprises separate motors and the inverters that drive those motors.

The new inverter is also cylinder-shaped and equal in diameter to the motor itself, enabling it to be connected coaxially within a chassis.

Perhaps the most important component of the new electric motor system is Mitsubishi’s decision to switch from using silicon chips in the powering devices for inverter switching, to using silicon carbide.

The subtle difference in the chemical component is extremely important, as silicon carbide has a breakdown electric field tens times greater than silicon alone, allowing for thinner chips. The silicon carbide chips also have a 50% reduction in loss compared to the older chip model.

Mitsubishi has also improved its permanent, neodymium magnent motor, and was able to reduce the size while seeing magnetic efficiency increase and a 5 percent power output boost.

Electric vehicles and hybrids are in a somewhat interesting position in the American market at the moment. While February saw an increase in green car sales, Chevrolet has temporarily suspended production of its much-talked-about Volt, saying the vehicle has become a “political punching bag.”


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