VFD for High Seed Motor
VFD for High Seed Motor
(OP)
Hello. I am a Mechanical Engineer working on a 20Hp, 2-Pole, AC Induction, 290Hz motor. The application is a variable torque load (Centrifugal blower), running in open loop control. I started with the reccommended Yaskawa F7 drive. I would like to use a less expensive (newer) Yaskawa V1000 drive. According to the VFD manufacturer, I should be able to use either drive. I think the major concern is the operating temperature of the motor. If the motor does not run any hotter, I would think it would be OK. Does anyone have any suggestions or comments? Thank you.





RE: VFD for High Seed Motor
There shouldn't be any reason for the motor to run at a different temp with a different drive. If you can set the V1000 to run up to 290Hz you should be fine.
Keith Cress
kcress - http://www.flaminsystems.com
RE: VFD for High Seed Motor
Some drives switched to a less than ideal switch pattern at high output frequencies and that increased the harmonics contents of motor current so rotor heat increased. It was a real problem with PM motors with massive rotor iron, but less so with induction motors with laminated rotors.
Gunnar Englund
www.gke.org
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