Should the motor use sealed bearings or open bearings?

Sealed bearings are bearings that come with grease when they leave the factory and have sealing covers installed on one or both ends. In theory, it can ensure that the bearings are free from contamination during transportation, assembly and application, and the amount of grease is reasonably filled by the manufacturer and remains consistent. For motor manufacturers, the use of sealed bearings can simplify the motor structure without the need to install additional inner and outer covers.

However, if there is a problem with lubrication during the operation of the sealed bearing motor, replacement is quite complicated. If non-professionals remove the sealing cover, it may cause improper bearing assembly, noise or even jamming.

In contrast, open bearings are more widely used in motors, allowing self-filling of grease, which is convenient for maintaining the motor lubrication system. However, open bearings are susceptible to contamination during storage, transportation, assembly and operation, especially in harsh environments and poor operating habits.

Therefore, whether the motor uses sealed bearings should be determined based on the motor and application conditions. If the bearings of high-speed motors are not properly selected, their efficiency indicators may also be affected.