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NKE AUSTRIA

Learn about NKE SQ77x insulated bearings, preventing electrical current passage, technical aspects, product range, applications, and references in various industries. Find out how to eliminate risks like damaged raceways or premature lubricant aging with these advanced bearings.

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NKE AUSTRIA

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  1. Version 01.2014 NKE AUSTRIA Electrically Insulated Bearings – SQ77x

  2. Content • General application / background • Technical aspects of electrically insulated bearings • Overview of product range • Applications and references for electrically insulated bearings • Summary

  3. General Application / Background (1/3) SQ77xis the Special Quality specification for insulated NKE rolling element bearings The insulation prevents the passage of electrical current thus eliminating the risk of • Damaged raceways • Damaged rolling elements • Premature ageing of the lubricant

  4. General application / background (2/3) The electrical current passing through the bearing may be caused by • Incorrect or faulty wiring • Faulty or damaged earth connections resulting in insufficient potential equalisation • Unshielded and/or asymmetric wiring in electric motors • Asymmetrical magnetic flux • Fast acting frequency converters

  5. General application / background (3/3) The potential for damage can be eliminated by • Ensuring correct wiring • Sufficient earth connection • Isolated coupling to the electrical machine • Electric filters • Grounding of rotors and brushes • Use of insulated NKE SQ77x bearings

  6. Technical aspects of electrically insulated bearings (1/3) Electrical insulation on bearings • Aluminium oxide ceramic insulating coating done by plasma spraying • The guaranteed minimum breakdown resistance of this insulating layer is 1000V / 3000V alternating or direct current. Variants: SQ77/SQ77C – insulating layerapplied to the outer ring. SQ77E/SQ77H – insulating layerapplied to the inner ring Application of coating and basic technical characteristics as for SQ77 + Less coated surface offering increased electrical impedance over SQ77

  7. Technical aspects of electrically insulated bearings (2/3) • All Boundary dimensions and tolerances are identical to those of standard bearings - complete inter-changeability and replacement of conventional bearings with NKE electrically insulated bearings is possible. • Load ratings (i.e. both static and dynamic) are equal to conventional bearings. • No peeling or chipping-off of the insulation layer, when the handling and mounting of the bearing is done carefully - otherwise the procedures are the same as for standard bearings. • NKE electrically insulated bearings are also available in combination with other special features to meet special application requirements and suit customer needs.

  8. Technical aspects of electrically insulated bearings (2/3) • SQ77x bearings are specifically prepared to ensure  geometric accuracy after coating  adherence of coating  consistent thickness of coating • Thickness of the coating applied by plasma coating:  > 0.125mm resp. 0.25mm for outer / inner ring and side faces  guaranteeing 1000V resp. 3000V minimum breakdown resistance with AC/DC

  9. Overview of product range (1/2)

  10. Overview of product range (2/2) • Popular SQ77 bearing types (with insulated outer ring) are available on stock or with short lead times, e.g. • Cylindrical roller bearingsDesign variants: NJ, NU, NUPDimension series: 210-230, 310-330Cages: brass and polyamideRadial clearance groups: C0, C3, C4 • Deep groove ball bearingsDimension series: 6212-6226; 6312-6326 Cages: brassRadial clearance groups: C3, C4 • Other bearing types and SQ77C/E/H upon request

  11. Reference: Electromotor manufacturer/metro (RU) • The customer is a leader in the Russian electric engineering industry. • NKE supplies electrically insulated bearings 6313-M-C3-SQ77 and NU313-E-M6-C3-SQ77 for electric traction motors; final customer: Metro (underground) of a Russian city.

  12. Reference: Railway service provider (AT) • ÖBB Technische Services, a company of the ÖBB Group, is responsible for maintenance and modernization of rolling stock and vehicle components • NKE has been supplying different types of bearings for traction motors • NU324-E-MPA-R200&220-SQ77 • 6322-M-C5H-SQ77

  13. Reference: Wind turbine generator manufacturer (CN) • Customer is a state-owned industrial enterprise located in central China • NKE was requested to support the customer in the bearing layout for a 1.5MW wind turbine generator. • Services provided: • Bearing evaluation, e.g. use of SQ77E • Bearing life calculation and auxiliary calculations, e.g. operational clearances, bearing preload, etc. • Layout of the lubrication system, e.g. grease type, grease guidance, etc. • Bearings supplied: 6330-M-C3-SQ77E

  14. Reference: Electric motors (IT) • Customer is a renowned manufacturer of electrical drive technology based in northern Italy • NKE supplied insulated deep groove ball bearings for electric motors • 6314-M-C3-SQ77 • 6318-M-C3-SQ77 • 6322-M-C3-SQ77 • 6326-M-C3-SQ77

  15. Summary • Simple and cost effective protection against bearing damage caused by the passage of currents • 4 variants (SQ77, SQ77E, SQ77C and SQ77H ) • Good availability: commonly used SQ77 types on stock • Technically proven solution for numerous applications

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