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. In the high-precision servo feed system, when the permanent magnet synchronous motor (PMSM) is operated at low speed in theclassical drive feed system (CDFS), the speed fluctuation caused by themotor torque harmonics seriously affects the speed smoothness of the servosystem. In this paper, a novel double-drive differential feed system (DDFS)is proposed to effectively suppress the effect of torque harmonics of PMSMon speed fluctuation of the linear feed system at low-speed operation. Firstly, the effect of motor torque harmonics on motor speed for the DDFS is analyzed by the sensitivity function of the servo system, which indicates that the torque harmonics have little effect on the motor speed at high-speed operation. Then, in the DDFS, we make two motors rotate in the same direction at high speed and differentially synthesize at the ball screw to obtain low-velocity linear motion. Compared with the CDFS, the DDFS can suppress the effect ofmotor torque harmonics on speed fluctuation of the table and improve speedsmoothness at low-speed operation.

Design and implementation of speed fluctuation reduction for a ball screw feed system at low-speed operation