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vik1501 said:Hi,
I want to control 0.5HP motor by changing the frequency of voltage
(230V). Is it possible :?: Any idea :idea:
stevez said:Yes, if it's an AC motor that is dependent on frequency for RPM then changing the frequency will change the RPM.
I hesitate to use the term synchronous to describe frequency dependency because to me that mean the RPM is locked in to the line frequency. Most AC motors will run at the synchronous RPM minus some small amount of slip. An example of this in the US - a 1750 RPM motor means that it's an 1800 RPM motor that looses 50 RPM to slip. Larger industrial motors are made to be locked in to line frequency and are expensive - though they have many advantages. They do make small universal motors that run on AC. I do not know if these respond to changes in frequency but I suspect that they don't.
Worth noting - the HP/torque will drop off as the RPM is reduced. You must be sure that the torque demand by the load can be met by the motor at reduced RPM conditions. Also note that some motors cannot be run at low RPM for very long or they'll overheat.
vik1501 said:Thanks to all of you who came up with gr8 answers.
But how do I maintain the a/c output. I don't want square wave as an output. :roll: