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Ryan, One variable you are forgetting is the VSD; are they the same in both the "old" and "new" setup? If the "old" setup has an older, slower VSD you will not see the same DC voltage spikes at the motor as you would with the "new" setup. If this is the case, the new motor would operate just...

Ryan, The minimum spark-breakdown voltage (regardless of pressure) for Copper in Air is 250 Volts; if the voltage is less than this, you should be good to go. Just keep in mind that the voltage at your motor terminals (the voltage that matters in this case) may not be the same as the line...

Ryan, I have a limited amount of experience with motor in vacuum environments, but I can tell you that yes, a fan motor designed for standard atmosphere will fail in vacuum due to the significant decrease in Partial Discharge Inception Voltage (PDIV). We have designed a few specialized motors...