What viscosity grade oil in grease is typically used in electric motors?

The viscosity grade of oil used in grease for electric motors is an important factor in ensuring proper lubrication and performance. A viscosity grade of 100 is commonly selected for this application because it provides a suitable balance between maintaining a sufficient lubricant film under operating conditions and ensuring the grease can flow adequately to all necessary components within the motor.

Greases with viscosity grades around 100 are designed to support the thermal and load conditions encountered in electric motor operation while offering good stability and resistance to breakdown over time. This viscosity level helps prevent wear and extends the life of motor components, as it effectively clings to surfaces and reduces friction.

Higher viscosity grades, such as 220 or 460, could lead to too much resistance, causing overheating and inefficiencies, while a lower grade, such as 50, may not provide adequate lubrication, particularly under load. Thus, the choice of grade 100 is optimal for balancing performance and protection in electric motors.