Hi i am planning to retrofit a machine i will change the servo motors as current ones are faulty etc.... anyways i know the motor ratings on the machine right now as follows
Yaskawa USAFED-30FS20E Rated 18.6Nm Continuou Max 22.5Nm Peak max 54.1Nm Rated Speed 1500rpm Max Speed 2000rpm Torque Constant 0.98Nm/A Moment of Inertia jm(=GD2/4) 110.0kg.m2x10-4 Power 2.9Kw now the servo i was looking at replacing with has the same torques but a lower Inertia Jm value. what effects does this have on the accell/deaccel , i know motor it self takes less toque to accel its self.. but how does this related back to the load wanting to carry on moving when trying to deaccel it, what are the the realworld or other impacts on the motor/drive , am i more likly to see higher bus voltage/regen problems from the motor loading, as this motor is on a Z axis and has no counter balance so the motor is braked for parking... motor runs at 1500rpm, screw is 10mm pitch i am not looking to go any faster just keep things the same ratings etc motor i was looking at replacing with is, as torque match's, Rated 19.1Nm Peak 57.3Nm Rated Speed 1000rpm max speed 1500rpm Rotor Moment of Inertia 53.5kg.m2x10-4 Power 2.0Kw or i go the next motor up Rated 28.7Nm Peak 86.0Nm Rated Speed 1000rpm max speed 1500rpm Rotor Moment of Inertia 77.8kg.m2x10-4 Power 3.0Kw maybe someone here can add some insight into what to watch out for when resizing/replacing servos in CNC systems etc just when you look up about servo sizing alot talk about the inertia ratio etc.. thanks, Rob ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
