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  • Users: UKpete
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  1. UKpete

    Allen Bradley ML1500 error

    Hi, this is a novice area for me. Have an old fairground ride with this AB ML1500 plc, the fault light has started flashing, displayed fault code is 0080. Looked this up on-line and it stated that the terminator module is disconnected. It definitely isn't and looks fine! Is it worth trying a new...
  2. UKpete

    Type of winding in a 3-phase induction motor

    While recently investigating a stator winding machine for a mass produced permanent magnet motor, I was told by the manufacturer of the winding machine that for coil inserters (the machine which mechanically feeds the pre-wound coil into the stator slot) the winding must be single-layer...
  3. UKpete

    Finding nearest value in a lookup table

    I have an Excel spreadsheet that calculates a series of resistor values from some test data. The problem I have is that I want the spreadsheet to select the nearest available values of resistance from a table of preferred values, a common enough type of problem I would have thought. Is there...
  4. UKpete

    Is the North Pole a south pole?

    I'm confused - I have a Martindale TEK200 Magnetic Indicator and the instruction manual that accompanies it states on page 5: "Note: also that a compass needle is a North Pole. It is attracted to point towards the south pole of any other magnet and NOT the north pole of any other magnet."...
  5. UKpete

    Machining laminations and testing for shorts

    We have an active magnetic bearing assembly (on a large motor) with a shaft "journal" consisting of a pack of 0.2mm laminations. These laminations are washer shaped, clamped between supporting plates and the whole pack is a shrink-fit on the shaft. It is subsequently machined to maintain...
  6. UKpete

    Oil spray cooling of rotor

    I need to design an oil-spray cooling system for the rotor of a high-speed motor. The plan is to spray each end-face of the rotor using the bearing oil supply. The rotor speed is 40krpm and the temperature approx. 160degC, the oil temperature is 75degC. The rotor internal losses amount to...
  7. UKpete

    Vibration modes of rotating shafts

    In simple terms (!) what is the difference between a forwards mode and a backwards mode, and why do the vibration mode frequencies change as the rotor speed changes? I'm referring particularly to small v.high-speed machine rotors that operate above first critical speed.
  8. UKpete

    US Standard for automotive alternators

    Is there a standard in the US that specifically covers alternators for automotive applications? I have had a brief look through the NEMA MG1 standard but I can't see any mention of automotive machines. I am actually interested in a high voltage auto alternator but any info would be useful. Thanks
  9. UKpete

    Testing under UL1741/UL2200

    We are in the process of getting UL Recognition on one of our power converters, and are required under UL1741/UL2200 (unless I have misinterpreted it) to demonstrate that the equipment remains safe when short circuits are applied across individual semiconductors and capacitors. The problem with...
  10. UKpete

    Damaged carbon fiber retention sleeves

    We have some permanent magnet alternator rotors (with carbon fiber sleeves) that have been removed and subsequently damaged. The damage appears very slight - mostly a single small dent perhaps 1 or 2mm across and a fraction of a mm deep, with no loose fibres evident under an eyeglass. The...

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