Workspace measurement position system（WMPS）is the short name for multi-station opto-electronic scan intersection measuring system.Real time measuring and tracking

high measurement precision

and wide application foreground are its advantages.The steady rotation movement of this scanner platform is the principal guarantee for the measurement precision.Driving the motor with space vector pulse width modulation（SVPWM）can lower the torque pulse effectively.Using PLL feedback control method

with the optical encoder of the motor

high-precision control can be achieved in constant speed.TMS320F2812 chip made by TI integrates EV module which can form SVPWM wave and realize PLL feedback control by detecting encoder orthogonal signals easily.It is verified by experiments

the driving method can reach precision of 0.1% and can fulfill the requirement of the system.