Direct-drive vs. geared-rotary servomotor: Design quantification

摘要

A geared servomotor competes head-to-head with a direct-drive servomotor using the same load, motion profile and mounting fixture, simulating a real-world application to determine if the performance advantages of the direct-drive system outweigh the higher initial cost. (In part 1, the case for decreasing backlash and increasing torsional stiffness was presented.) For this test, the following evaluation criteria were considered:1.Positioning accuracy2.Backlash3.Settling time4.Cycle time5.Machine cost and payback time6.Design complexity.