Aiph5u
August 12, 2021, 1:53am
128
Hey all,
Alphonse:
My experience with other 3 phase motors driven by variable frequency drives is that you should be cautious of going lower than the manufacturer’s recommendation. They become less efficient and give up more of the current in heat vs. output. So if HY says 6k is the minimum for theirs, that is what I will stick with. Not sure who’s spindle you are using and it may be okay at 1000 rpm but I doubt it.
I agree with Alan. Here you can see a typical rotational speed/torque diagram for a 2.2 kW 80 mm water-cooled spindle . As you can see, there is practically no torque below 6000 rpm.
With this 1.5 kW 65 mm water-cooled spindle this lower limit is even higher with 9000 rpm.
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