High-temperature-resistance high-precision Hall encoder

Abstract

The invention belongs to the technical field of electric servo structure, and specifically relates to a high-temperature-resistance high-precision Hall encoder. The invention provides a high-temperature-resistance high-precision Hall encoder which is used to measure matching usage of an electric servo system and meets a requirement that a Hall encoder can work in a -40-150 degree environment temperature scope and a requirement that an output of the Hall encoder achieves an 12-bit absolute precision output in 360 degrees. The high-temperature-resistance high-precision Hall encoder comprises a housing, a metal shaft, a nylon shaft, a bearing, a bipolarity magnet, a thermal insulation layer, a Hall chip and an upper cover; the metal shaft is disposed at a center position of the bottom of the housing, the nylon shaft is disposed on the metal shaft, the bearing is disposed between the outer side of the nylon shaft and the housing, the upper end of the nylon shaft is provided with the bipolarity magnet, the upper part of the housing is provided with the upper cover, the thermal insulation layer is disposed in an internal cavity formed by the housing and the upper cover, the thermal insulation layer is buckled to the outer side of the nylon shaft and the bipolarity magnet, and the Hall chip is disposed on the inner side of the upper end of the thermal insulation layer.

Description

technical field [0001] The invention belongs to the technical field of electric servo structures, and in particular relates to a high-temperature resistant and high-precision Hall encoder. Background technique [0002] At present, encoders have been widely used in industrial control systems at home and abroad. With the continuous development of aerospace servo technology, traditional potentiometers can no longer meet the requirements of the development of electric servo technology. The demand for encoder technology is constantly increasing. Aerospace servo products must be resistant to harsh working environments. At the same time, the encoder has high precision requirements, and the primary technical index requirements for high temperature resistance. At present, most of the encoders at home and abroad are industrial grade. , the ambient working temperature is generally between -40 and 85 degrees, which cannot meet the requirements of aerospace electric servo actuators. In o...

AI Technical Summary

Problems solved by technology

[0002] At present, encoders have been widely used in industrial control systems at home and abroad. With the continuous development of aerospace servo technology, traditional potentiometers can no longer meet the requirements of the development of electric servo technology. The demand for encoder technology is constantly increasing. Aerospace servo products must be resistant to harsh working environments. At the same time, the encoder has high precision requirements, and the primary technical index requirements for high temperature resistance. At present, most of the encoders at home and abroad are industrial grade. , the ambient working temperature is generally between -40 and 85 degrees, which cannot meet the requirements of aerospace electric servo actuators. In order to meet the requirements of the development of electric servo technology, the present invention designs a novel Hall encoder structure from the structural design To improve the high temperature resistance performance of the encoder and meet the requirements of the servo system's ambient working temperature index of -40 to 150 degrees, the Hall chip AS5045 and the high temperature resistant rotating bipolar magnet are used to accurately measure the angle within the entire 360 ​​degree range. An absolute angle measurement method can instantly indicate the angular position of the magnet, and its resolution reaches 0.0879 degrees, which is equivalent to 4096 positions per circle, and can be output in series data output and PWM signal mode

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