What factors should be considered in bearing design of exhaust fan motor

Update:25 Dec 2023

The bearings of the exhaust fan motor are an important […]

The bearings of the exhaust fan motor are an important part of ensuring the stable operation of the motor and extending its service life. Professional bearing design needs to consider multiple factors, including high temperature environment, high-speed rotation, noise control, etc.
Bearing type:
In bearing design, you first need to select the appropriate bearing type. Rolling bearings (such as deep groove ball bearings, cylindrical roller bearings, etc.) and sliding bearings (such as liquid sliding bearings) are two common types. The selection depends on factors such as motor load, speed, operating temperature, etc. In high-speed running exhaust fan motors, rolling bearings are usually used because they have better adaptability to high speeds and high loads.
Bearing material:
Bearing material selection is critical to motor performance. In high-temperature environments, high-temperature resistant materials such as ceramics or high-temperature alloys are often used in bearing manufacturing. Such materials have high heat resistance, hardness and wear resistance, helping bearings maintain stable performance under high temperature conditions.
Sealed and dustproof design:
Exhaust fan motors are often installed in environments with dust and moisture, so the bearings need to be designed with dust protection and sealing in mind. Using an effective sealing system prevents dust and moisture from entering the bearings, reducing wear, extending service life, and improving motor reliability.
Bearing preload:
Bearing preload refers to adding a certain force inside the bearing to cause slight compression during operation. Proper bearing preloading helps reduce bearing clearance and improves the accuracy and stability of the motor. This is especially important for exhaust fan motors that rotate at high speeds to reduce vibration and improve overall performance.
Bearing lubrication:
Bearing lubrication is a key factor in ensuring the normal operation of bearings. In high temperature environments, the selection of grease needs to consider its stability and fluidity at high temperatures. High-temperature greases typically use synthetic base oils and high-temperature antioxidant additives to ensure lubrication performance is maintained under high-temperature conditions.