This paper presents a permanent magnet synchronous motor
(PMSM) servo drive system for high speed flat industrial
sewing machine. In order to satisfy the special function of
sewing machine, several approaches are applied in this servo
system: Using voltage feed-forward decoupling control in
current loop to improve speed and position control
performance; Variable gain control is adopted in system to
compensate incomplete decoupling caused by disturbance and
inaccuracy of parameter; PMSM used in system is specially
designed with concentrated winding and lean charge
magnetism barrel-drain rotor, which can effectually improve
motor operating and reduce torque harmonics. The
experimental curves of sewing procedure show that: the speed
feedback can accurately track speed reference under different
sewing conditions, which proof the servo control system meet
purpose of industrial sewing machines well.
