Operating conditions: difficult environment with factors such as high speeds, high temperatures, contamination from dust, voltage fluctuations
Direct drives are often used for compact fans. The impeller is mounted directly onto the electric motor’s driven shaft, meaning that a great deal of strain is placed on the bearings in the fan’s electric motors. In these operating conditions, bearings can wear out prematurely, leading to production downtime and high maintenance costs.
Single-row deep-groove ball bearings are most commonly used for direct drive systems.
Electricity can flow through the bearing as a result of voltage fluctuations, causing electrical corrosion inside the bearing. To solve this problem, NSK has developed deep-groove ball bearings with spread ceramic balls. These offer protection from electrical discharge through the bearing leading to electrical corrosion.
High-temperature sealed deep-groove ball bearings
Deep-groove ball bearings in different sizes and designs
Operating conditions: high and unevenly distributed loads, high speeds and temperatures, contamination
The electric motor is mounted parallel to the fan’s impeller. In this case, power is transferred via one or more V-belts and pulleys. This design is usually used for medium to large fans. High volume flows and a build-up of heat can cause the bearings to wear out prematurely, resulting in production downtime and high maintenance costs.
The SNN series of plummer blocks from NSK features five different sealing arrangements to meet a range of requirements. The individual components are easy to fit, remove and maintain. Together with advantages such as high rigidity and good heat transfer, the split housings in the SNN series help to reduce costs.
NSKHPS Spherical Roller Bearings
Self-Lube® HLT Inserts
Self-Lube® Inserts with Flinger Seals
Operating conditions: axial displacement, high and unevenly distributed loads, high speeds, extreme temperatures, contamination
The electric motor is mounted on the same axis as the fan’s impeller. The shafts of the electric motor and the fan are connected by a torsionally flexible coupling. This method of connecting the impeller with the electric drive is mainly used for medium and large fans.
The tough conditions can cause the bearings to wear out prematurely, reducing productivity and driving up maintenance costs.
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