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Yamaha has recently unveiled its latest innovation in electric motorcycles and filed a patent for a high-performance electric motorcycle. Previously, Yamaha showcased the PES1 and PES2 electric motorcycle concepts in 2013 and 2015, respectively. The company might be ready with its technology, waiting only for the right market conditions to begin commercial production.
1- Air-cooling technology, not liquid-cooling
There are many exciting features in Yamaha’s newly patented electric motorcycle. One of the key highlights is an air-cooling system for the electric motor. The design includes a unique battery case, which is the central aspect of the patent. Yamaha opted for an air-cooling system instead of the liquid cooling typically used in high-performance electric motorcycles. Since the air-cooling system is less complex, it helps reduce production costs and lowers the bike’s weight.
Liquid cooling has its advantages, such as achieving the optimal temperature for the electric powertrain, which means heating in cold conditions and cooling in warm conditions. However, liquid cooling systems are more complex and require additional components such as pipes, radiators, sensors, and pumps. These complexities are avoided with an air-cooled system, although it may not be as efficient as liquid cooling. Yamaha likely chose an air-cooled system because the next generation of batteries is expected to be more resistant to extreme temperatures. Therefore, an air-cooling system should be sufficient for managing the temperature of the electric powertrain.
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2-Unique battery case
Yamaha has designed a unique battery case to achieve better space utilization and improved heat dissipation. It features a large central casting along with tub-shaped upper and lower sections. With minimized seams, the battery case is more resistant to water ingress. The case has four internal platforms, each containing two battery packs. These platforms have fins on the underside for effective cooling, and similar structures are found on the sides and bottom of the case. In addition to cooling, the fins also enhance rigidity. The top section of the battery houses the battery management system and electronic controls. The onboard charger is installed under the seat, while the DC-to-AC inverter, which powers the electric motor, is located under the bike's belly.
3- Yamaha electric motorcycle specifications
The bike uses a conventional chassis paired with a trellis-style front frame. There is a swingarm pivot, likely made of aluminum. The electric motor is positioned at the rear and uses a reduction gearbox to drive the front sprocket. A unique rear suspension has been employed to accommodate the rear positioning of the motor. Yamaha has not yet revealed the performance numbers for this new electric superbike, but it's interesting to note that Yamaha already supplies electric powertrains to other OEMs. These powertrains range from 35 kW (47 hp) to 350 kW (470 hp). Given the practical considerations Yamaha introduced in the patent, this new electric superbike might actually reach the production stage. However, the launch could still be a few years away.