Magnetic encoder and angle calculation method thereof

Abstract

A magnetic encoder comprises a sleeve shell which is divided into an upper shell, a lower shell and a cylindrical cavity formed therebetween; a magnetic disk which is arranged on a rotating shaft to read the rotating state of the rotating shaft, arranged in the sleeve shell and hinged to the sleeve shell; four Hall elements which are circumferentially arranged in the same surface of the sleeve shell and are matched with the magnetic disk to work; an integrated differential amplifier which is used for calculating the continuously output voltage value of the Hall elements into a continuous function, and provided with at least two groups of input ends electrically connected with the output ends of the Hall elements; a double-channel analog-to-digital converter which is used for converting thecontinuous analog function into a digital signal, and provided with an analog input end electrically connected with the output end of the integrated differential amplifier; at least two FIR filters in which the input ends are electrically connected with the two output ends of the two-way analog-to-digital converter respectively; and a DSP integrated chip which is used for comparing the two digital functions to calculate an actual coding angle.

Description

technical field [0001] The invention relates to an encoder structure, in particular to a magnetic encoder and an angle calculation method thereof. Background technique [0002] An encoder is a device that compiles and converts signals (such as bit streams) or data into signal forms that can be used for communication, transmission, and storage. The encoder converts angular displacement or linear displacement into an electrical signal, the former is called a code disc, and the latter is called a yardstick. According to the readout method, the encoder can be divided into two types: contact type and non-contact type; according to the working principle, the encoder can be divided into two types: incremental type and absolute type. The incremental encoder converts the displacement into a periodic electrical signal, and then converts the electrical signal into a counting pulse, and uses the number of pulses to represent the magnitude of the displacement. Each position of the abso...

AI Technical Summary

Problems solved by technology

[0008] The present invention is aimed at the problem that the existing magnetic encoder usually judges the rotation direction through the double-function phase transition, and cannot determine the initial angle when restarting, and designs a magnetic encoder. By changing the position of the Hall sensor, the actual voltage function can be changed. The characteristic point of the maximum amplitude value is used to judge the initial angle when the encoder starts

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