This paper presents an implementation of control system of position actuators in LAMOST. Performance of actuators
has been tested in laboratory. The resolution of actuators is less than 5nm. The whole control system has been
successfully realized in LAMOST MB pre-segmented experiment. The control system of position actuator adopts
distributed-and-centralized mode. Displacement RMS error of the control system (including actuator and electrical
control) is less than 50 nm.
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