Absolute encoder angle reading circuit and method based on FPGA

Abstract

The invention discloses an absolute encoder angle reading circuit and method based on FPGA. The absolute encoder angle reading circuit based on FPGA includes an FPGA chip, a bus transceiver, a DSP chip and the like. The absolute encoder angle reading method based on FPGA includes the steps: 1) the FPGA chip sends a control signal to an absolute encoder through the bus transceiver, and the controlsignal includes an initial code, a synchronous code, a control instruction, a check bit, and an end bit; (2) the absolute encoder transmits a data signal to the FPGA chip through the bus transceiver,and the data signal includes a control frame, a state frame, a data frame, and a check frame; (3) the FPGA chip generates a narrow pulse positioning signal, and determines the position of the angle data and the lap data in the data signal; and (4) the FPGA chip uploads the processed angle data and lap data to the DSP through the bus. The absolute encoder angle reading circuit and method based on FPGA can simplify the complexity of reading angle data information when using an absolute encoder in the past, and enable the process of processing time sequence by the FPGA to be more convenient and quick so as to further improve the efficiency of motor control.

Description

technical field [0001] The invention relates to the field of absolute encoder and servo motor control, in particular to an FPGA-based absolute encoder angle reading circuit and method. Background technique [0002] In the field of motor control, the angular position signal of the rotor is crucial to the algorithm of motor control, and the same is true for permanent magnet motor control. How to quickly read the rotor position signal is a key factor to better control the motor. At present, the mainstream way to read the angular position of the servo motor rotor is mainly through encoders, resolvers and other methods. The encoders are mainly divided into two types: incremental encoders and absolute encoders. The defect of the incremental encoder is that it only outputs the ABZ pulse signal, and the initial angular position cannot be known, which makes it inconvenient to start the motor. Absolute encoders can avoid this problem, but the angle data reading protocol of absolute...

AI Technical Summary

Problems solved by technology

The defect of the incremental encoder is that it only outputs the ABZ pulse signal, and the initial angular position cannot be known, which makes it inconvenient to start the motor

Absolute encoders can avoid this problem, but the angle data reading protocol of absolute encoders is more complicated, which increases the difficulty of reading angles

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