*3.3.3 The higher temperature in operation*

In the conventional system, lubrication oil dissipates the heat from the system and ensure the specific operating temperature. However, in electric motors heat dissipation is done via a cooling fan. Additionally, bearings are running at high speed, so the heat generation rate is higher hence the operating temperature. Motor bearing with seals and grease must have the ability to retain the lubricant inside the bearing at elevated temperature.

## *3.3.4 NVH and lower friction*

Motor bearings are expected to operate at lower noise and lower vibrations. This is one of the key requirements for the motor bearings considering the high speed of operation, varying loads, and acceleration.
