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Bearing temperature, in most cases, will start rising swiftly once the motor starts, continuing to rise until it reaches a certain temperature. At this point, bearing temperature remains stable and constant. The time it takes to reach this stable operating temperature depends on various circumstances. These include the heat capacity and conductivity of the bearing housing and motor shaft, the amount of heat generated, and the type of lubricant used.

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Bearings are an integral part of electric motors. Designed not only to support the rotor, they help maintain a sufficient air gap between the stator and rotor, while also helping transfer the load from the shaft to the motor’s frame. For small electric motors, bearing failure is usually dealt with by replacing the entire motor. With larger motors, replacement is more expensive than repair.  So bearing failure often leads to considerable downtime, resulting in an expensive loss of productivity. To keep bearing performance optimal and to prevent bearing failure, it’s highly desirable to use the best quality bearings available, along with protective accessories like bearing seals and shaft grounding rings, so that they’re able to withstand any environmental stresses.

Temperature also plays an important role in bearing performance, as higher temperatures degrade lubricants and diminish their usefulness. When designing electric motors, understanding the normal operating and ambient range of temperatures in which they operate helps determine a motor’s best cooling method. While lubricants can help keep motors cool (by reducing heat generated by friction), air or water can also be used for cooling.

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To learn more about protecting bearing performance, Electro Static Technology’s AEGIS®️ Shaft Grounding Rings can offer protection against bearing failure due to electrical damage.

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Bearing performance tends to be highest when within a normal temperature range during operation. For bearings in electric motors, this will be between 160°F and 230°F (71°C to 110°C). For consistent bearing performance, lubricants should be able to perform well throughout this temperature range, though there are high-temperature lubricants able to handle higher temperatures. When ambient temperatures significantly differ from a motor bearing’s operating temperature, it’s important to check internal bearing clearance and adjust this so there’s no excessive play, a procedure called preloading.

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While the ideal operating temperature will differ depending on the bearing and application, selecting the right bearing for the job is crucial.  The bearing must be able to handle the operating temperatures when the motor is running. Its performance depends on the balance between the rate at which heat is produced and the rate at which it dissipates.

Friction occurs when there’s interaction between components within a bearing. Performance depends on the interactions between the inner race (ring), outer race, retainer, rolling elements, and the seal or shield.  Friction occurs whenever the bearing rotates, but there is also static friction when the bearing is at rest. The torque necessary to overcome this static friction to begin rotation is called starting torque.  Starting torque typically increases when larger bearings are used or the load increases.

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Friction causes wear on any moving part within a motor, including bearings. Performance reductions due to friction are only a part of the equation, as too much friction over longer periods can damage equipment and systems extensively. While bearing performance must consider a certain amount of friction when in operation, choosing the right bearings for an application to limit friction is important.

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Typically, the lifespan of lubricant in smaller ball bearings tends to exceed the motor’s service life, so these often require no additional lubrication. For a larger bearing, performance depends on regular and appropriate relubrication.  (Too much lubricant is almost as bad for bearings as too little.) Additional conditions like contamination, operating environment, and sealing arrangements also affect bearing performance.

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Proper lubrication keeps bearing performance optimal and extends the life of a bearing. The performance of an electric motor depends upon bearings being properly lubricated. Lubricants act to form a protective film separating the rolling contact services to prevent direct contact between metal components.  Such contact causes friction and heat that prematurely wears the bearing. Performance issues caused by corrosion are also mitigated through the use of lubricants. For these reasons, using the most suitable lubricant for the application is important.

How long a lubricant might last also depends on some or all of these considerations. The major factors affecting bearing performance include bearing and lubricant type, the motor’s speed and orientation, and the bearing’s operating temperature. For example, roller bearings require lubrication at shorter intervals than is the case with ball bearings.

Significant differences in temperature between the inner and outer race reduce the clearance of a bearing.  This is a problem while running at a steady speed and, especially shortly after startup.  Increased rise in temperature, therefore, affects a bearing’s service life and is why using higher-quality lubricants can help improve the lifespan of a motor.

It’s absolutely essential to have sufficient lubrication to reduce torque lost to friction in a bearing. Performance is ensured by keeping bearing surfaces properly lubricated so that they stay separate, reducing friction and extending the equipment's lifespan. It’s also important to remember that a lubricant’s composition, temperature, and viscosity affect bearing performance. Generally, motors that must move heavy loads require more viscous lubricants, while high-speed applications need lubricants with lower viscosities.

Bearing performance must be sufficient for the motor to work well at both higher and lower speeds, though electric motor designers must also take into account friction to reduce energy consumption. Designers must also consider bearing performance when looking at the requirements for specific motor applications. This often includes determining the limitations of various sizes and types of bearings. Performance should also ensure the design considers economic aspects like the cost of manufacturing and maintenance for a motor.

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All three of these factors – friction, lubrication, and temperature – combine to affect bearing performance. Friction and viscosity of the lubricant work together to increase bearing temperature. Heat will dissipate into the shaft and bearing housing, with the lubricant helping to stabilize operating temperatures. Too much lubricant can negatively affect bearing performance by causing temperatures to rise; however, a general rule is that lubricant should fill 25-35% of the empty space in the bearing.  SKF has a widely used formula for calculating the appropriate volume of grease based on the bearing’s size.

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