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  1. kingjoey

    Motor Temperature Rating

    Thank you Skogsgurra. I quess that my basic question is: How hot can I operate this motor? I am using an infrared device to measure the outside temperature of the motor. I hope that the readings are representative of the winding temperatures. Thanks again, KingJoey
  2. kingjoey

    Motor Temperature Rating

    Thank you dpc. Another question - The motor has class F insulation. Does this mean that the motor windings can be operated at a 105 deg C rise above a 50 deg C ambient since class F insulation is capable of 155 deg C? Thanks again. Kingjoey
  3. kingjoey

    Motor Temperature Rating

    Hello, I have a motor with a temperature rating on the nameplate that says: AMB 50 Degrees C Is this the maximum allowed temperature rise above ambient or is this the maximum allowed temperature of the motor? No other termperature reference is on the motor. This is an older motor from the...
  4. kingjoey

    Power Transformer 55/65 Degree C Rating

    Thank you jghrist. Two more questions. If a transformer is rated with a 55/65 Degree C designation, what is the actual insulation rating? Is it 55 or 65 Degrees C? What is the actual KVA of the transformer? Is it the 55 Degree C KVA rating or the 65 degree C KVA rating? Thanks, KingJoey
  5. kingjoey

    Power Transformer 55/65 Degree C Rating

    Please explain what the meaning of insulation temperature rating of a power transformer. I am confused as to what a 55 Degree C, a 55/65 Degree C, and a 65 Degree C designation really means. Also, it is my understanding that the lower the temperature rise the lower the rated full load...
  6. kingjoey

    DC drive or AC drive?

    What are the an advantages/disadvantages of using a DC drive/DC motor combination vs. a sensorless vector AC drive/AC motor combination? I have a choice to use either combination on a system we are upgrading. Can anyone offer any opinions or advice? Thanks, Joey.
  7. kingjoey

    What is a Vector Drive?

    Thank you jbartos. The links help. I am curious as to what a flux vector drive does to the motor stator field, current and voltage in order to control torque and speed. I am familiar with the volts/hertz technique but I do not understand vectoring. Thanks again, joey
  8. kingjoey

    What is a Vector Drive?

    I am very much confused on how a vector drive works. I cannot get a clear explaination from anyone on how a vector drive controls an AC induction motor. Can anyone help? Thanks, joey

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