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  • Users: GusD
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  1. GusD

    Equipment Installation

    We have just installed 2 new 1.2 Mw induction motors,4000v/1800 rpm, in a new rock crusher application.These motors weigh approx 11 metric tonnes. My problem has to do with the size of shim stock used under motor feet.Common sense and good practice would tell you that"shims"should...
  2. GusD

    BRUSHLESS DC MOTORS

    I would like to know from anyone that has hands on experience with the brushless DC drives.If you have used these motors,How reliable are they? What type of system was it used on?Pump,Blower,Conveyor? Did you use anything with HP rates of 200 to 400 HP ? Thank you all for help. GusD
  3. GusD

    Motor mounting

    GusD' We have just installed 2 new 1.2 Mw induction motors,4000v/1800 rpm, in a new rock crusher application.These motors weigh approx 11 metric tonnes. My problem has to do with the size of shim stock used under motor feet.Common sense and good practice would tell you...
  4. GusD

    VFD Motor to Replace Wound rotor Motor

    We have one conveyor that is currently powered by 5 -1250 hp WRM.4 motors driving 2 pulleys at the head end, and 1 motor at the tail drive.The length of the conveyor determines the # of drives needed to move a certain load. Soon we will be increasing the Tonneage on this conveyor and it appears...
  5. GusD

    Electrical currents thru bearings

    I need information on bearing failures caused from the passage of electrical current. I am fairly familiar with this problem and its cures on elcrtric motors powered from VF Drives or (inverters). The problem I am refering to ,is regarding "main crankcase bearings" on Diesel engines...
  6. GusD

    Burnt motor leads at Y connection (star points)

    We have experienced this problem for several years and with different motors.The problem is usually limited to burnt motor leads at the Star connection.These motors are 5 Kv induction motors.The Star point 3 leads in some cases are bolted together and taped,on other motors ,the 3 leads are...
  7. GusD

    VOLTAGE MEASUREMENTS ON VFD OUTPUT

    GusD (Electrical) Mar 22, 2003 Voltage measurements on a VFDrive with IGBTs in the inverter. We have just installed a new VFD (IGBT) to replace an older VFD (GTOs)that gave us a lot of problems over the years.After commissioning the unit we experienced some problems with blown power fuses as...
  8. GusD

    Voltage measurements on a VFDrive w

    Voltage measurements on a VFDrive with IGBTs in the inverter. We have just installed a new VFD (IGBT) to replace an older VFD (GTOs)that gave us a lot of problems over the years.After commissioning the unit we experienced some problems with blown power fuses as well as converter power Diodes ...
  9. GusD

    Electric motor shafts

    We have always used hard-chrome to repair bearing journals on our electric motor shafts.Fifteen or twenty years ago we did experiment with spray welding,results were disastrous in some cases,reason why we stayed with chrome ,unless the damage was greater han .020" in which case we...
  10. GusD

    Electrical Motor Shaft Repair

    We have always used hard-chrome to repair bearing journals on our electric motor shafts. Fifteen or twenty years ago we did experiment with spray welding, but the results were disastrous in some cases,reason why we stayed with chrome ,unless the damage was greater han .020" in which case we...
  11. GusD

    Repairs to electric motor shaft journals

    We have always used hard-chrome to repair bearing journals on our electric motor shafts.Fifteen or twenty years ago we did experiment with spray welding, but the results were disastrous in some cases,reason why we stayed with chrome of motor shafts,unless the damage was greater han .020&quot...

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