Performance, Resolution, and Velocity Control of Stepper Motor-Driven Precision Positioners
encoder. Shown above, repeated 25-nm steps measured with a laser interferometer: performance of an L-509 (below), entry level precision positioning stage operated in open loop (no position feedback. The stage [...] and 1mm ball screw and driven by an SMC Hydra controller with 3000 microsteps. (Image: PI miCos) L-509, compact, high precision stepper motor linear stage is available with travel ranges to 4" Position [...] instability if the servo parameters are not set carefully. A typical servo system feeds off errors, i.e., it needs to see an error before it reacts. These effects do not occur with a stepper motor, because