Magnetic Rotary Encoders for Banknote Detection Systems

Abstract

The invention discloses a magnetic rotary encoder for a banknote detection system, which comprises a casing with upper and lower ends open, one end protruding from the lower end of the casing and a rotating shaft made of non-magnetic material, sleeved on the rotating shaft and connected to the casing. The bearing in contact with the inner wall, the collar set in the middle of the upper end face of the rotating shaft, the permanent magnet set in the collar, the lower magnetic protection plate set on the rotating shaft to eliminate the external magnetic signal under the permanent magnet, set on the permanent magnet The circuit board on the inner wall of the housing above, the magnetic sensor located on the lower surface of the circuit board, the upper magnetic protection plate located on the inner wall of the housing above the circuit board, the cover plate located at the upper end of the housing, and the magnetic sensor electric Connected wires protrude out of the housing. The invention has the characteristics of eliminating energy of most external magnetic signals, good anti-interference performance, good signal stability and high output signal precision.

Description

technical field [0001] The invention relates to the technical field of protection against non-target magnetic signal interference of a magnetic sensor, in particular to a magnetic rotary device for a banknote detection system that can eliminate most of the energy of an external magnetic signal, has good anti-interference performance, good signal stability, and high output signal precision. Encoder. Background technique [0002] Through photoelectric or magnetoelectric conversion, rotary encoders can convert mechanical quantities such as angular displacement and angular velocity of the output shaft into corresponding electrical pulses and output them in digital quantities. They are widely used in speed control and position control. [0003] The magnetic rotary encoder used in the usual banknote detection system adopts an integrated magnetoelectric conversion chip. The magnetoelectric conversion chip integrates a high-precision AD module. When the number of pulses output by th...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantage that the magnetic sensor in the prior art is susceptible to external magnetic signal interference, and to provide a sensor that can eliminate most of the energy of the external magnetic signal, with good anti-interference performance and good signal stability. , Magnetic rotary encoder for banknote detection system with high output signal accuracy

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