Good morning all,
I have a Rong Fu 31 mill/drill machine. For a bench top machine it is not too bad and has served be well for the past 15 years or so. I recently upgraded the DRO to the machine and that has made it even better.
The one that that is really annoying about the machine is the double belt system for variable speed. After a while moving those belts around between the 3 pulleys gets old and I am looking for alternatives.
The motor is a single phase motor that can be wired for 120VAC or 220VAC, currently wired for 220. Controlling the on-off is a rotary switch like that found on many industrial machines.
Without replacing the motor, is it possible to control this motor with a VFD? If so, which would be a good choice?
Chris D.
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Mactec54
I was afraid of that.
Thanks for the info Mactec54.
Chris D
One main issue is that the ones that exist, the motor can drop out of run at either at low RPM or when loaded, hence the popularity of 3ph versions.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
People I know swap out the single phase motor for a 3 phase one and add a VFD
Rod Webster
www.vmn.com.au
You can made it easier to find a 3 phase that will bolt right in without serious mods.
Determine the Frame Size of your original motor. Measure from centre of shaft to base of the foot. In Australia its in 'mm', ie Frame 80 is 80 mm distance.
Shaft dia and keyway will probably be the same. Location of terminal box.
2 pole or 4.
Should be all you need.