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Recent content by montgomeryjack

  1. montgomeryjack

    Crankshaft journal bearing pitting

    Hi all Some interesting points...I have another more specific question on the problem - so let's assume I am building up static charge on the crankshaft, and at the moment we have a badly grounded frame so a static discharge occurs..fact now if I introduce a ground strap and ground the...
  2. montgomeryjack

    Crankshaft journal bearing pitting

    No VFD - just a straight forward DOL start and run
  3. montgomeryjack

    Crankshaft journal bearing pitting

    Hi all I have read a couple of threads related to this topic, but I can't put my finger on this specific problem - We work with a diesel/electric drive system, diesel engine or electric standby motor driving a compressor via a clutch/belt drive system. We are experiencing electrical pitting...
  4. montgomeryjack

    Motor design standards - Inrush and Voltage sag

    I'm designing a 15KW 2-pole polyphase induction motor to run on mobile equipment throughout Europe. The motor will of course be designed to NEMA/IEC standards and will start DOL - giving approx 200A peak over the first 500ms. However is there another limitation on the max inrush that I/the grid...
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