Implementation of a New Digital Grating Angular Acceleration Measurement System Based on FPGA and its Error Analysis

Abstract

Shaft angular acceleration is one of the most important parameter of rotary machines, the designation and implementation of a new angular acceleration measurement system is proposed in this paper. First, the speed signal is acquired through grating and infrared photocell, then interpolation speed signal with high-frequency pulses, so as to convert speed signals to pulses, last, angular acceleration is received by processing these pulses. This measurement system combined with FPGA and SCM, the function of FPGA are generating pulses、interpolating speed signal and counting the number of pulses, the result of count is processed by SCM. The high accuracy of measurement system is verified accord to the test.and the causes of errors are received by theoretical analysis.