Magneto-electric coder calibration method based on arc tangent crossing interval tabulation method

Abstract

The invention discloses a magneto-electric coder calibration method based on an arc tangent crossing interval tabulation method and relates to the field of magneto-electric coder manufacturing. The method comprises steps of carrying out signal acquisition on a magneto-electric coder; by use of the arc tangent crossing interval tabulation method, calculating the measurement angle of the magneto-electric coder; by dividing the whole circumference into eight 45-degree sub-intervals in a 360-degree manner, thereby avoiding a problem of easy occurrence of wrong calculation caused by quite big calculation difficulty when there is positive and negative infinity in the arc tangent values; and finally, using a 16-bit precision photoelectric coder measurement value as the reference, carrying out calibration correction on a measurement angle solved by the arc tangent method based on a crossing interval average tabulation method, and eliminating errors in a crossing interval linear interpolation manner. According to the invention, a problem of decreasing of measurement precision caused by existence of the positive and negative infinity values and mechanical errors in magnetic steel positions in the traditional arc tangent method can be overcome; and angle calibration can be performed on the magneto-electric coder.

Description

Technical field: [0001] The invention relates to a method for calibrating a magnetoelectric encoder based on an arctangent spanning tabulation method, and belongs to the technical field of magnetoelectric encoder manufacturing. Background technique: [0002] Encoders are used to measure angles and are the core components for motor control. They are widely used in high-tech fields such as mechanical engineering, robotics, aviation, and precision optical instruments. They play a vital role in modern industry. Among them, the magnetic encoder has strong anti-interference ability and strong adaptability to harsh environments such as dust, rain and fog. The code disk can be repeatedly recorded and erased, and the manufacturing cost is lower than that of the photoelectric encoder, which is suitable for small batch production , The current industrial environment has an increasing demand for magnetic encoders. [0003] The accuracy of the magnetoelectric encoder is lower than that of the ...

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Problems solved by technology

[0004] However, the traditional arctangent algorithm is difficult to calculate when the arctangent value is positive infinity and negative infinity, and it is easy to cause calculation errors, and the installation of the Hall element inevitably has mechanical installation deviation, and there is a deviation in the magnetization process of the magnet. The magnetic field signal generated by the magnetic steel is not an ideal sinusoidal waveform, and the magnetic sensitivity characteristics of each Hall element are different, which will cause deviations in the collected magnetoelectric signal. In addition, the magnetoelectric signal needs to be converted from analog to digital. In this process Noise will be introduced to cause angle calculation errors, and the above errors will lead to a decrease in the angle measurement accuracy of the magnetoelectric encoder

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