Bosch has presented a new electric motor for light and medium-duty 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.
The new electric motor is known at Bosch as the Electric Motor 230. In combination with a new silicon carbide inverter from the Bosch development department, the component is said to achieve a system efficiency of up to 97 per cent. In addition, the motor is very light, weighing less than 140 kilograms, and is specially designed for a long service life, according to an accompanying press release. The speed level ranges from 0 to 14,000 revolutions per minute.
For this development, Bosch says it paid special attention to optimising the continuous power density to ensure a compact design and easy integration into electric rigid axles. Alternatively, the machine can also operate independently in combination with a transmission unit. As mentioned at the outset, the machine supports a continuous power range of between 150 and 230 kW, and Bosch specifies continuous torque of up to 430 Nm.
To achieve this, so-called hairpin technology and combined oil-water cooling are used in the stator. In addition, the rotor and stator are oil-cooled on the inside and the active parts are housed in a water cooling jacket. 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.
Bosch’s US 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 per cent. Additionally, “Silicon carbide chips used in power electronics can improve the efficiency of the battery drive by up to 6 per cent”.
The new 230 motor and the inverter are also matched to each other in such a way that they can be used together in one system. According to Bosch, this results in system efficiency of up to 97 per cent.
“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.”
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