At Motor Bella 2021, held last week in Detroit, Bosch introduced its new efficient 230 electric motor for commercial and medium-duty vehicles. With a rated voltage of 800 volts, the motor is designed for long service life. During its development, Bosch engineers paid particular attention to optimizing the continuous power density to enable a compact design and easy integration into electric rigid axles. To achieve this, hairpin winding technology is used in the stator as well as combined oil-water cooling. The rotor and stator are internally oil-cooled and the active parts are installed in a water cooling jacket. The new electric motor is available in power ratings between 150 and 230 kilowatts continuous output.
The Bosch portfolio also includes an advanced inverter with silicon carbide (SiC) technology. The improved electrical conductivity of this new semiconductor material reduces heat losses, enabling higher switching frequencies and improved power density. With this Bosch achieves an efficiency of up to 99 percent in its new generation of inverters. Silicon carbide chips used in power electronics can improve the efficiency of the battery powertrain by as much as 6 percent.
Bosch 230 electric motor now combined with the inverter
When combined, the inverter and electric motor are fine-tuned to each other to enable their use together in one system. This results in a system efficiency of up to 97 percent. Bosch is one of the first suppliers to make this possible for commercial vehicle applications, resulting in increased range or saved battery capacity.
The Bosch e-axle combines the power electronics, electric motor, and transmission in a single unit. With a pre-integrated system solution for vehicle platforms, Bosch helps automakers bring electric vehicles to market faster than before. To complement its system-level expertise, Bosch also offers DC/DC converters as well as electric motors and inverters.