Effects of reduced/low frequency (VFD) on a motor
Effects of reduced/low frequency (VFD) on a motor
(OP)
I know the effects of increasing the frequency (above 60 Hz) essentially shortens a motors life (heating, etc.). I wish to know what, if any, detrimental effects occur from running a motor at a lower frequency...say 40 Hz, for a majority of the time.





RE: Effects of reduced/low frequency (VFD) on a motor
If you don't have an inverter duty motor, than the motor could have a shortened life due to voltage spikes from the VFD.
RE: Effects of reduced/low frequency (VFD) on a motor
RE: Effects of reduced/low frequency (VFD) on a motor
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RE: Effects of reduced/low frequency (VFD) on a motor
The answer to your question can range from nothing bad to a quick failure depending on how you apply the motor and VFD. There will be no problems if you apply the motor and VFD properly.
As for the VFD voltage spike comments. It seems these days all general purpose motors are wound the same regardless of having a VFD rating or not unless you buy a very premium VFD rated motor (think Marathon Blue Max type of motor). A number of manufacturers just slap their "VFD Rated" tag onto the standard motors to make the VFD rated versions. So, voltage spikes can always be a concern even with a VFD rated motor.
RE: Effects of reduced/low frequency (VFD) on a motor
EE