What is sealed bearing of AC Induction motor?

Sealed bearings are a type of bearing of the three phase asynchronous induction motors that has been designed to prevent the ingress of contaminants, such as dirt, dust and moisture, while also preventing the leakage of the lubricant contained within. This is achieved by the use of seals, which are typically composed of rubber or synthetic materials and are positioned on one or both sides of the bearing.Why are sealed bearings used?

• Protection from contaminants: Contaminants can cause premature wear and failure of bearings. Sealed bearings help to extend the bearing’s life by keeping them clean.
• Retention of lubricant: The lubricant inside the bearing is essential for reducing friction and wear. Sealed bearings help to prevent the lubricant from leaking out, which can lead to increased friction and heat.
• Reduced maintenance: Sealed bearings require less maintenance than open bearings, as they do not need to be re-lubricated as often.

Types of seals used in bearings

• Contact seals: These seals make direct contact with the bearing raceway and form a tight seal to prevent contaminants from entering and lubricant from escaping.
• Non-contact seals: These seals do not make direct contact with the bearing raceway but create a labyrinth or maze that is difficult for contaminants to penetrate.

Advantages of sealed bearings

• Longer life: Sealed bearings typically have a longer service life than open bearings.
• Reduced maintenance: Sealed bearings require less maintenance.
• Improved performance: Sealed bearings can improve the performance of a machine by reducing friction and wear.

Disadvantages of sealed bearings

• Limited operating temperature: The seals used in sealed bearings may have limitations on the maximum operating temperature.
• Limited relubrication: Once the lubricant inside a sealed bearing is depleted, it cannot be easily relubricated.

Sealed bearings offer several advantages over open bearings, including increased reliability, reduced maintenance, and improved performance. However, there are some limitations to their use, such as limited operating temperature and difficulty in re-lubrication. The choice of whether to use a sealed or open bearing will depend on the specific application and operating conditions.

Wolong motor provide all kinds of three phase ac motor with different kinds of bearings such as the brand(SKF/FAG bearing), sealed or open bearing, explosion proof motor or non-Ex type. Welcome to try the whole series of Wolong products!