On 8 March 2011 08:03, Clint Washburn <cl...@clintandheidi.com> wrote:
> I am in the process of converting my 1978 Hitachi Seiki CNC lathe to EMC. > It currently has a 7.5 KW dc motor that used to be powered by FUJI SCR > drive. My first problem my house does not have 3 phase power. I am having > to work around this issue with my whole retrofit. I wish to convert this > to > a 3 phase AC spindle. What VFD's are people having success with as a > spindle drive with single phase power? Is it realistic to have a 10 hp 3 > phase spindle on single phase power? or will I have to go with a spindle > motor closer to around 7.5hp instead? What is everyone's input on this? > > Clint Washburn > > As far as I know; A motor rated at 7.5kW can deliver a similar power, but it does not have to. Spinning the motor under no-load for example, it will only draw a few hundred watts. If your milling load is 1kW, for example, that's all it will be supplying, so you only really need an inverter relative to your needs. I would try borrow the largest single phase inverter you can get hold of, and test it out. Set the max-current-out to a reasonable value to prevent overloading the inverter on startup. And change the motor connections to delta for the lower input voltage. Regards Roland ------------------------------------------------------------------------------ What You Don't Know About Data Connectivity CAN Hurt You This paper provides an overview of data connectivity, details its effect on application quality, and explores various alternative solutions. http://p.sf.net/sfu/progress-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
