How to Select the Right Deep Groove Ball Bearings for Electric Motors

Selecting the right bearing is one of the most critical decisions in electric motor design. Deep groove ball bearings are the most commonly used bearing type in electric motors—accounting for over 70% of all bearings used in industrial motor applications. In terms of quantity, this proportion is even higher. Therefore, understanding how to select the right deep groove ball bearing is essential for motor engineers to ensure optimal motor performance and reliability.

Deep groove ball bearings were previously called radial ball bearings, and as the name suggests, their primary function is to support radial loads.The spherical rolling elements make point contact with the raceways, which gives these bearings their characteristic low friction and high-speed capability.

Simultaneously, due to the structural characteristics of its raceways, the bearing can withstand a certain amount of axial load. The axial load capacity of deep groove ball bearings is much weaker than their radial load capacity. Therefore, under axial load conditions, the lifespan of deep groove ball bearings needs to be checked to ensure that the bearing can achieve the expected operating performance under this load.

Deep groove ball bearings, compared to roller bearings, have point contact between the rolling elements and raceways.

1.Relatively Low Internal Friction and Heat Generation

Because the rolling elements and raceways have point contact, the internal heat generation of the bearing is relatively low. If the bearing has seals, the frictional heat generated by the seals must be considered during operation.

2. High Speed Capacity

Deep groove ball bearings have spherical rolling elements. Compared to roller bearings, their rolling element mass is relatively small, resulting in lower centrifugal force at high speeds. Furthermore, commonly used stamped steel or nylon cages offer good strength. Therefore, deep groove ball bearings have a high mechanical limiting speed capacity. Correspondingly, due to relatively less heat generation, their thermal reference speed capacity is also relatively high.

Application under vibration conditions: Deep groove ball bearings are prone to damage to the raceway and rolling elements under vibration conditions. Therefore, deep groove bearings will face certain challenges under vibration conditions.

DEMY Deep Groove Ball Bearings – Built for Reliable Motor Performance

Behind every efficient electric motor is a bearing you can trust. With 20 years of precision manufacturing experience, DEMY specializes in deep groove ball bearings that deliver low vibration, quiet operation, and extended service life. Widely used in industrial motors, household appliances, and automotive applications, DEMY bearings are the choice of engineers who demand consistency and quality. Choose DEMY – Choose Reliability.