On 01/10/2014 06:55 PM, Greg Bentzinger wrote: > Hello fellow LCNC users; > > I am seeking advice of the collective hive mind on the best course of action > for a machine build I have been slowly working on. Note also I am not in a > rush to finish, I prefer to take as long as is needed to get it right the > first time as I loath having to do things over again. > > The base iron will be a modified Seig X3. > > Spindle motor is an ABB M2VA80B-4 3GVA082002-BSB The data plate states its a > 3ph IP55 IEC 34-1 with the following wiring options. > > V 380-420 Y or 220-240 Delta @50Hz 1400rpm 0.75kW 2.3 / 4A > V 440-480 Y or 250-280 Delta @60Hz 1680rpm 0.90kW 2.2 / 3.3A > > First thought was to get a decent sensorless vector 1.5kW VFD fed from my > 220V 1ph line. I planned to underdrive the spindle 1.5:1 to provide decent > torque, then over speed the motor to 6000rpm providing a max spindle rpm of > 4000rpm. Other than a fly cutter the largest tool the machine is expected to > use is 1/2". > > I am on rural power, and I have my own transformer feeding my property. I do > have a rotary phase converter which feeds my Hurco KM3P knee mill, but I'm > hoping to wire in VFD's so I won't need to run the rotary - feeding a 10hp > motor to just sit there and generate the phantom leg is taking a big bite out > of my wallet. My rate is $0.128/kWh. > > A while back there was mention of using a voltage doubler which output DC and > feeding that directly into the VFD. I am now wondering if this might be a > better way using a lower current 460V VFD to drive the spindle motor. > > Most small VFDs are designed to run on single phase input. Just select one with that capability. I will note that I'm running two larger machines with VFDs specifically NOT designed for single phase input, and they run fine, anyway!
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