Simultaneous Measurement and Simulation of Angular Position and Angular Speed for Time Grating

Abstract

A method is presented in order to realize the measurement of angular position and angular speed simultaneously based on the theory of time grating and the measurement of angular position and angular speed is transformed into the measurement of phase difference. Four orthogonal excitation signals are generated by the internal phase-locked loop module of FPGA. The excitation signals are superposed and input to the stator sensor. At this time, the rotation of the motor causes the rotation of the rotor sensor to generate the induction signal. The phase difference of the two signals will be obtained by the input comparison circuit of the induction signal and the excitation signal. The phase difference will be processed in FPGA, and finally the angular position and angular speed values will be obtained. The simulation results show that the method is feasible. The experimental results show that the accuracy error of angular position measurement can reach ±3", and the measurement speed stability can reach 3rpm(3%o) when the angular speed is 1000rpm.