The automotive world is getting electrified, driven by environmental legislation, public opinion and newcomers to the market. By the year 2020, EU legislation limits CO2 emissions for newly registered cars to a maximum of 95 g/km, and further reductions are expected afterwards. With the trend of vehicle electrification, the need for high power density in electric motors is increasing in order to increase efficiency and achieve optimal packaging.
High power density has a high effect on the thermal management of the electric motor with increasing demand for rotor cooling. Rotor cooling systems require dynamic sealing in high speed and durable conditions, exceeding physical limits of conventional sealing products.
The high power density also requires high rotational shaft speeds to deliver the required power output, which leads to challenging conditions for sealing the electric motor from the reduction gear oil.
For this purpose, EKK developed the GlideX™ Surface Textured Electrical Motor Seal (EMS) and Reduction Gear Seal (RGS).
The GlideX™-EMS and -RGS enable electric motor and reduction gear manufacturers to cross physical limits and utilize high rotational shaft speeds and active rotor cooling, without having to be afraid of high friction and leakage.
EKK GlideX™ seals are based on mechanical seals, using advanced surface texturing technology that enables microscopic flow control in the dynamic sealing faces. This technology breaks the boundaries of the reciprocal relationship between friction and leakage, enabling the reduction of both sealing parameters. Test results verified the reduction of both properties to an unreached sealing performance, with zero leakage capability and over 90% less friction compared to conventional seals.