Torque motor of the turntable key components of the ultra-precision optical aspheric machine tool

Due to the geometry complexity and high precision requirement, there are many challenges in the design, manufacture and measurement of ultra-precision micro-structured freeform surfaces with form accuracy at sub-micrometer and surface finish in nanometer range. Successful manufacturing of ultra-precision micro-structured freeform surface relies on the high precision of machine tools. The precision, stability and repeatability of the turntable are the key factors of the high precision machine tools. Thanks to the large number of poles, mechanical transmission elements associated backlash and frictional losses are dispensed with, torque motors are more frequently applied to rotary tables and axes. This paper demonstrates the selection process of the torque motor for precision turntable under certain conditions. Two torque motors are selected according to the pre-given boundary conditions and both have appropriate torque to drive the given rotational object.