Outside of the OP requirements but I am curious to know if it would perform favorable if the BLDC was only ever driven at relatively slow speeds by a VFD turning a heavy load. Justin On Mon, 6 Aug 2018 03:22 Jason White wrote: > Okay, thanks Sean and Alan. I figured that probably was the case. > > On Sun, Aug 5, 2018 at 2:37 PM, Sean Breheny wrote: > > > Most likely it would work most of the time. However, I would be somewha= t > > concerned about what might happen if the load on the motor changed > > suddenly. In such a case the motor might stall with the VFD continuing = to > > drive an AC sequence at high frequency since it has no feedback about t= he > > motor movement. > > > > With an induction motor, there would still be torque in such a situatio= n > > and if the load on the motor became slightly lighter the motor would > begin > > to spin again. With a permanent magnet motor, there woudn't be much > torque > > at all when the slip is so extreme so it would require resetting the VF= D > or > > manually slowing it down until there was sufficient torque again to get > the > > motor spinning. During this time when the slip was extreme the motor > could > > be getting quite hot. > > > > > > Sean > > > > > > On Sun, Aug 5, 2018 at 12:17 PM, Jason White < > > whitewaterssoftwareinfo@gmail.com> wrote: > > > > > Hello, > > > > > > I am working on rewiring a small CNC mill. For the spindle the existi= ng > > > unit has the following brushless DC motor with hall effect sensors (s= ee > > > attached drawing). It is rated at 160V, 7A. > > > > > > Could this motor be driven by a VFD intended for conventional 3-phase > AC > > > induction motors? As I understand it most 3-phase AC motors are 220Va= c > > > which would suggest that the answer is no. > > > > > > For this application I do no care about slippage or precise speed. > > > > > > Thanks, > > > Jason White > > > > > > -- > > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > > View/change your membership options at > > > http://mailman.mit.edu/mailman/listinfo/piclist > > > > > > > > -- > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > View/change your membership options at > > http://mailman.mit.edu/mailman/listinfo/piclist > > > > > > -- > Jason White > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .