Bosch presents super-efficient e-motor for commercial vehicles
Bosch has presented a new electric motor for light commercial vehicles at the Motor Bella trade fair in the USA. The new ‘electric motor 230’ has a rated voltage of 800 volts and is designed for power levels between 150 and 230 kW continuous output and torque up to 430 Nm.
In combination with a new, freshly developed silicon carbide inverter, the component achieves a system efficiency of up to 97%. In addition, the motor is very light, weighing less than 140 kilograms, and is specially designed for long service life. The speed level ranges from 0 to 14 000 rpm.
For this development, Bosch says it has paid special attention to optimizing the continuous power density to ensure a compact design and easy integration into electric rigid axles, frequently used in LCVs. Alternatively, the motor can also operate in combination with a transmission unit.
So-called hairpin technology and combined oil-water cooling are used in the stator. Hairpin technology is a wire winding method used in the production of electric motors. Compared to coiled copper wire, the hairpin-shaped copper rods increase the amount of conductive material in the motor, which increases the power density.
In addition, the rotor and stator are oil-cooled on the inside, and the active parts are housed in a water cooling jacket. Bosch’s portfolio also includes a new inverter with silicon carbide (SiC) technology.
According to the German supplier, the improved electrical conductivity of this new semiconductor material reduces heat losses and enables higher switching frequencies and improved power density. This enables efficiency of up to 99%.
And Bosch adds: “Silicon carbide chips used in power electronics can improve the efficiency of the battery drive by up to 6%”. Moreover, the new 230 motor and the inverter can be used together in one system. According to Bosch, this results in system efficiency of up to 97%.
Building blocks for electrification
“When it comes to electromobility, the Bosch portfolio covers a vast array of possibilities to support our customers in bringing new electrified solutions to the market,” said Paul Thomas, Executive Vice President, Mobility Solutions for the Americas at Bosch.
“From powertrains to steering systems to brakes, Bosch’s portfolio includes all the building blocks for the electrification of vehicles and allows for a seamless integration into our customers’ various electrical and vehicle architectures.”