SKF launches new sensor bearing

SKF launches a new sensor bearing with improved protection against power surges. Typically used in electric motors, the new bearing has an in-line electromagnetic compatibility (EMC) filter that protects the sensitive sensor bearing electronics from high electric stresses.

In certain applications, like fork-lifts operating in sugar factories, or fork-lifts operating on insulated floors, an extremely strong electrostatic charge can build-up on the fork-lift’s frame - which can get discharged abruptly - when there is proximity of the fork-lift frame to the warehouse steel racks for example. The resulting discharge spark can have a damaging effect on electronics. The spark may not have a direct impact on sensors or the control unit, but the change in voltage can have a “rebound” effect creating voltage surges in the lines. These voltage surges, which can result in Electrical Fast Transients (EFTs) ranging from 100 to 4000 V, can have a temporary impact on the electricity supply, or damage the controller or sensors completely.

SKF has analysed this phenomenon as it relates to sensor bearings, and was able to develop an in-line filter to protect the Hall sensor and other electronics used in its bearings.