A magnetic encoder and its angle calculation method

Abstract

A magnetic encoder, comprising: a casing, which is divided into upper and lower casings to form a cylindrical cavity in the middle; a magnetic disk, which is used to read the rotation state of the rotating shaft, is arranged in the casing, and is hinged with the casing; the Hall A total of four components are arranged in a circle on the same side of the casing, and work with the disk; integrated differential amplifiers are used to calculate the continuous output Hall element voltage value into a continuous function, and at least two sets of input terminals are connected to the Hall element. The output terminals of the components are electrically connected; the dual analog-to-digital converter is used to convert the continuous analog function into a digital signal, and the analog input terminal is electrically connected to the output terminal of the integrated differential amplifier; FIR filters, at least two, of the two FIR filters The input ends are respectively electrically connected to the two output ends of the dual-channel analog-to-digital converter; the DSP integrated chip is used to compare two digital functions to calculate the actual encoding 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 a signal (such as a bit stream) or data into a signal form that can be used for communication, transmission and storage. The encoder converts angular displacement or linear displacement into electrical signals, the former is called a code wheel, and the latter is called a code ruler. According to the reading 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 count pulse, and the number of pulses represents the magnitude of the displacement. Each position of the absolute enc...

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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