Could you compare what are the advantages or disadvantages of torque mode and velocity mode when using it for CNC milling machines?
I still confuse which one should be used if we use it for CNC machine.
Regards
Tim
Comments 2
Galil_AndyH on
02/28/2007 - 13:43
Torque mode is ideal for positioning movements. The advantage of running an amplifier in velocity mode is when your application calls for a constant speed with low velocity ripple. Typically during point to point moves, or positioning movements, holding a constant and perfect velocity through the move is not critical. What is critical is maintaining and holding position at the end points. In most applications this is easier to tune with an amplifier in Torque mode.
For a CNC machine, holding position under a load is typically the most critical aspect. With a properly sized amplifier this can be obtained regardless if it is a torque or velocity mode amp.
bsturm on
02/13/2008 - 06:18
Velocity mode amplifiers also require tuning both the amp and then the position controller. If the amp is in torque mode, then you generally only need to tune the position controller.
Galil_AndyH on 02/28/2007 - 13:43
Torque mode is ideal for positioning movements. The advantage of running an amplifier in velocity mode is when your application calls for a constant speed with low velocity ripple. Typically during point to point moves, or positioning movements, holding a constant and perfect velocity through the move is not critical. What is critical is maintaining and holding position at the end points. In most applications this is easier to tune with an amplifier in Torque mode.
For a CNC machine, holding position under a load is typically the most critical aspect. With a properly sized amplifier this can be obtained regardless if it is a torque or velocity mode amp.
bsturm on 02/13/2008 - 06:18
Velocity mode amplifiers also require tuning both the amp and then the position controller. If the amp is in torque mode, then you generally only need to tune the position controller.