Double-Hall magnetoelectric encoder angle estimation method and device based on special-shaped gear

Abstract

The invention belongs to the field of encoder manufacturing, and relates to a double-Hall magnetoelectric encoder angle calculation method and device based on a special-shaped gear. The absolute positions of the edge of the special-shaped gear and the Hall element are changed by separating the rotor from the permanent magnet and rotating the special-shaped gear, so that the double Hall elements respectively collect sine and cosine signals, analog-to-digital conversion is performed on the Hall signals by using the analog-to-digital converter, and then the angle value of the magnetoelectric encoder is calculated through arc tangent. And finally, tabulating the relationship between the calculated angle value and the double-Hall digital signal numerical value, and providing a method for estimating the angle value by looking up the table and further utilizing an interpolation method. The process not only greatly reduces the demagnetization phenomenon of the permanent magnet caused by high temperature in the working process, but also eliminates the risk that the permanent magnet is easy to break, and improves the precision of the encoder. Moreover, many arc tangent calculation steps are avoided, and the working efficiency of the single-chip microcomputer is greatly improved.

Description

technical field [0001] The invention belongs to the field of encoder manufacturing, in particular to a method and device for estimating the angle of a double Hall magnetoelectric encoder based on special-shaped gears. Background technique [0002] An encoder is a device that compiles and converts signals or data into signal forms that can be used for communication, transmission and storage. The encoder converts angular displacement or linear displacement into electrical signals. In modern industry, the encoder is an indispensable and important component for measuring the angular position of the motor rotor, and it is also the core component to realize the motor control. Encoders are widely used in high-tech fields such as mechanical engineering, robotics, aviation, and precision optical instruments. Magnetic encoders have many advantages, such as simple structure, high temperature resistance, oil resistance, impact resistance, small size, low cost and so on. Moreover, the ...

AI Technical Summary

Problems solved by technology

[0005] In response to the above problems, the present invention proposes a solution aimed at solving the problem of decreased accuracy caused by the demagnetization of the permanent magnet of the magnetoelectric encoder during work, and designs a new structure to improve the accuracy of the encoder, and proposes based on this Angle Estimation Method for Structured Encoders

Images