Abstract
In this paper, a novel double-drive differential feed system (DDFS) is proposed to significantly reduce the torque ripple influence of a permanent magnet synchronous motor (PMSM) on the feed fluctuation of linear feed systems at low speed operation. First, the influence of motor torque harmonics on the motor speed for the DDFS is analyzed by the sensitivity function of the servo system, which indicates that the effect of torque harmonics on the motor speed decreases with increasing speed. According to the sensitivity function analysis and the modal analysis of the DDFS, the reasonable speed operating ranges of a differential double drive motor are determined to obtain low smoothness velocity of the table for the DDFS. Compared with classical drive feed system (CDFS), the DDFS reduces the influence of the motor torque harmonics on the feed fluctuation of the table at low-speed operation and avoids the system resonance caused by motor torque harmonics at certain speed points.
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