The electrification of mild- and heavy-duty vehicles sets highest demands on the traction motor. For example, the vehicle lifetime is multiple times higher as it is for passenger car applications and in addition, the ratio between continuous and peak power is much higher.
While state-of-the-art water jacket cooling concepts for electric motors are enabling a high peak power density, they are very limited with respect to continuous power density. This leads to large and heavy traction motors for mild- and heavy-duty applications.
MAHLE has developed the novel and innovative Superior Continuous Torque (SCT) electric motor cooling technology, which makes is possible to achieve much higher continuous power for a given package. The MAHLE SCT motor works with high continuous power output close to its peak power for an unlimited time. Within the motor, the oil is guided as close as possible to the source of the heat and at the same time mechanical losses caused by the oil are reduced to a minimum.
With its capability for a very long lifetime, highest continuous power density and efficiency, as well as suitable torque and speed characteristics, the SCT motor has been specifically designed to meet the requirements for mild- and heavy-duty applications. To find the best solution for each customer, MAHLE benefits from its core competence in the fields of thermal management, mechanical and electromagnetic design. MAHLE has developed a design workflow for electric machines, which makes a simultaneous multi-objective optimization of electromagnetic, mechanical, and thermal design possible.
