LumberJocks

Reply by dfarr

  • Advertise with us

Posted on Old three phase motors and Variable Frequency Drives (VFD)

View dfarr's profile

dfarr

19 posts in 2097 days


#1 posted 04-04-2010 01:21 AM

VFDs introduce transients with extremely fast voltage rise times into the circuits that can quickly destroy the insulation in older non-inverter duty motors. There have been many motor design improvements since VFDs came on the scene once it was apparent that drives are here to stay. Inverter duty motors have design changes like increased winding slot insulation, increased first turn insulation and increased phase-to-phase insulation to withstand peaks of up to 1600 volts. Another frequent mistake made is slowing older motors down below 1/2 rated speed (<30HZ) which creates overheating due to the motor fan not moving enough air.


DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase