| Abstract |
A common method for angular position and speed estimation, in adjustable speed drives, uses an
incremental shaft encoder and an electronic circuit. This paper presents a high precision electronic
conditioning of a biphase incremental encoder generated signal. A digital tachometer, for angular
position and speed measurement, is implemented using two simple FPGAs. One FPGA, based on the
multirange CET method, is applied to measure the angular speed with a relative error lower than
500ppm. A second FPGA implements a high precision pseudo-absolute angular position sensor. To
prove and evaluate the abilities of the proposed measurement system, a PC-AT board has been
designed and a 2000 pulses per revolution commercial biphase incremental encoder has been used.
Experimental results exhibit an excellent behaviour of the proposed measurement system. |
