Hi;
I want to control the speed of 3 single phase motors each 120W by a 3phase inverter drive. In this case, the motors will be connected in star connection. How about this idea? Please share your experience.
Running 03Nos Single Phase Motors By A 3Phase Vfd
Started by AB2005, May 30 2018 06:16 PM
1 reply to this topic
#1
AB2005
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Posted 30 May 2018 - 06:16 PM
"Don't assume any thing, always check/ask and clear yourself".
#2
marke
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Posted 30 May 2018 - 08:25 PM
Hello AB2005
If the three motors are identical, and all operate at the same time, and at the same load, and are shaded pole motors, then this will work fine.
If the motors have a start winding along with a start switch to connect and disconnect that winding, then the impedance will be so variable, that the voltage applied to each motor will change and there will be issues.
It works well for shaded pole fan motors, but some of these motors do not like the PWM waveform and can overheat with increased slip losses.
There is a VFD designed for use with single phase motors, you would need one VFD per motor.
Best regards,
Mark
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