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  • Users: Mendit
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  1. Mendit

    Electrical insulated bearings on DC Motors

    We are familiar with the NDE insulated bearings on AC drives and both bearings insulated on AC drives for VFD applications. We have a large 750HP DC motor which has a classic fluted raceway approx 120 degrees of arc on the inside of the outer race. A perfect set of frosted balls and a frosted...
  2. Mendit

    Babbitt Bonding to Bronze

    We are having bonding problems when spin casting. The casting of bearing shells by the spin cast process has worked well for us for years,we have not changed our methods or products. We recently undertook s job where the split shells are made from SAE 660 bearing bronze. The casting looks great...
  3. Mendit

    Effects of magnetic center forces

    Does any body know the answers ? What are forces of magnetic centering of motor rotors on sleeve bearing machines. If the rotor were off center by as much as 1/4" how much force would there be trying to correct this. We have 8000hp 4160v motor and the DE bearing is fixed position (only...
  4. Mendit

    Chiller motor, will not perform

    We recently rebuilt a chiller motor (600hp 3600rpm)It had a die cast rotor. The motor failed from broken rotor bars. We removed all the old die cast alum, manufactured new rotor bars and shorting rings from alum, all sizes were dulicated within 1-2%. The rotor bars are welded to the shorting...
  5. Mendit

    Hot Recycled Oil Pumping

    We have a High Pressure Barrel pump (7 stages) It is used to pump waste oil at Recycled oil plant. Before the oil enters the pump it is preheated to approx 650 C. This is causing coking problems and very rapid wear of the pump. All case, and impeller wear rings, center bushing and throat...

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