How to choose a VFD for controlling the speed of a three phase induction motor of 5 HP rating with the rated current of 7.5A? Also can a single VFD be used to control several motors at a time?
The synchronous speed of motor is Ns=120 f / P.
The variation in frequency can vary the motor speed.
but too low speed can cause overheating of motor and winding burnout. Therefore motors with above class B insulation required.
The VFD is generally rated by Kw ratings and can be selected accordingly.
single VFD can be used for multiple motors but speed of all motors will be same.
Hello, Pavithra!
Actually, there are a number of techniques to opt a frequency converter feeding an induction motor. Some of it are available in internet:
http://www.frequencyinverter.org/frequency-converter-selection-guide-400884.html
http://www.vfds.com/blog/vfd-buying-guide
http://www.eaton.com/ecm/groups/public/@pub/@electrical/documents/content/ia04003002e.pdf
Also, there are frequency converters that allow to employ a few induction motors with, in general, the same parameters and power.
Best wishes!
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