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NKE AUSTRIA

Version 01.2014. NKE AUSTRIA. Electrically Insulated Bearings – SQ77x. Content. General application / background Technical aspects of electrically insulated bearings Overview of product range Applications and references for electrically insulated bearings Summary.

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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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