The inverter enables the conversion from DC (Direct Current) power derived from batteries to three phase AC (alternating current) electric power needed for the electric motor. Motorcycle electric applications move the challenges to a higher level, as they have to fit stringent dimensional limits, need to work in an external environment (coping with extreme hot and cold conditions, water, humidity, etc.) and require high power density.
In particular, the inverter for the BMW CE 04 electric scooter delivers 43.5 Kilowatt peak at nominal voltage of 145 Volt, with full performance (300 Ampere rms) in the 115-175 Volt range.
In general, this type of inverter developed by Marelli features distinctive characteristics such as flexibility and a scalable architecture, as it can have more powerful versions (up to 450 Ampere rms – 348 Volt) fitting in the same space and dimensions.
Also the inverter software has been developed by Marelli, with BMW providing the vehicle software, hosted by an Electric Control Unit located in the same inverter case. The software is compliant with Autosar (AUTomotive Open System ARchitecture) standards and specifically customized for the diagnostic standards required by BMW. Functional Safety requirements are compliant to ASIL B (Automotive Safety Integrity Level B) standard.
