Development of best servo motor for leather sewing machine

[GerryR]

In the system I have (AC-VFD), the motor is spec'd at 35-459 RPM, 10-90 Hz.  That is the output from the 5:1 reducer (gearmotor).  I have a 1-1/2" motor pulley going to a 7" drive pulley for another 4.67 reduction giving 7.5 RPM at the machine at 10 Hz (minimun specified operating frequency for the motor), which amounts to 0.125 revs.per second or 1 revolution every 8 seconds.  But that is not the point.  The point is that when I hit the pedal, and the motor starts to move, I am easily in the safe operating zone of the motor, 10 Hz minimum.  It would be absurd to run the machine at 1 stitch every 8 seconds for any length of time.  The idea is to keep the motor happy and stll be able to do some controlled slow stitching.  Just my $.02