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  • Users: r2d2
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  1. r2d2

    Motor Service Factor

    Zak, The overload your motor is experiencing (103% of rated load current)should not be a concern, provided the winding temperature does not attain a level that could be damaging. Looking at the safety aspect, from the motor's point of view, the winding insulation being the weakest component in...
  2. r2d2

    PAM Winding Connections.

    Thankyou "jbartos" and "teco" for your suggestions and assistance. Unfortunately there is more than one motor involved. As a service center, I receive occasional requests for conversions from existing (standard) single speed motors to two speed. Depending on the request, I...
  3. r2d2

    PAM Winding Connections.

    Dear Fellow Members/Readers, I'm looking for suitable websites or literature that could provide details of PAM Winding connections (two speeds, one winding) for medium and large Three Phase Electric Motors. If there is anyone connected with PAM Windings in Three Phase Electric Motors who has...
  4. r2d2

    Heat transfer on Large Electric Motor windings.

    Thank you for your suggestion "Bozz" this was considered at the initial stages of modification, but did not prove effective from the volume of air the fans would blow even with angle change. There is also limited space making increasing the depths of both fans(to increase air...
  5. r2d2

    Heat transfer on Large Electric Motor windings.

    Thank you once again for your help it was most appreciated. Preliminary calcs on the existing system so far suggests the cooling capacity of the heat exchanger is inadequate.
  6. r2d2

    Heat transfer on Large Electric Motor windings.

    Thank you for your helpful formula "motorman" it was most appreciated. Could you possibly help me with the formula for calculation of the required airflow (cubic feet per minute, or cfm) in this case. I will have to select and fit suitable fans to replace the existing ones which I am...
  7. r2d2

    Heat transfer on Large Electric Motor windings.

    I have a problem of designing a cooling system for a Large Electric Motor. The existing system involves a modified heat exchanger(Radiator type with water circulation) that is inadequate. As a result the motor runs extremely hot (130 Deg. Celcius winding temperature). Several "hit and...

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