Small high-dynamic and high-precision digital output magneto-electricity encoder and mounting control method thereof

Abstract

The invention discloses a small high-dynamic and high-precision digital output magneto-electricity encoder and a mounting control method thereof. The digital output magneto-electricity encoder comprises a main shaft, a main body, a signal processing circuit board and a shell; the main shaft and the main body are in dual-bearing support mechanism; a radial magnetizing circular magnet is arranged ina main shaft counter bore; the signal processing circuit board is a wafer shape, and a Hall sensor chip is arranged at the center of the front, and a microcontroller and a CAN bus interface circuit are arranged at the back, and the signal processing circuit board is fixed on a step surface of the main body through bolts; a magnetic field signal is tested by adopting a diameter differential way, and a closed-loop tracking segmentation algorithm is used for quickly converge a measurement angle to input two orthogonal cosine signal corresponding angle values. Through the small high-dynamic and high-precision digital output magneto-electricity encoder and the mounting control method thereof disclosed by the invention, the interference resistance is improved, and the measurement angle precision and the response speed are improved.

Description

technical field [0001] The invention relates to the technical field of displacement and angle sensors, in particular to a small-sized high-dynamic and high-precision digital output magnetoelectric encoder and an installation control method. Background technique [0002] As a displacement and angle sensor, magnetoelectric encoder is widely used in motor servo system and automatic control system. The aerospace field has higher requirements for magnetoelectric encoders, which require high dynamic, high precision, and high reliability output, as well as compact structure, oil resistance, and vibration resistance. [0003] The patent (patent number: ZL201620250596.5) provides a dual Hall signal sampling magnetoelectric encoder, which uses two Hall sensors with a phase difference of 90° to sample the magnetic field signal. The magnetic field signal of this structure is easily affected by noise. The impact of stray magnetic field and ambient temperature; secondly, when angle demod...

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Problems solved by technology

[0003] The patent (patent number: ZL201620250596.5) provides a dual Hall signal sampling magnetoelectric encoder, which uses two Hall sensors with a phase difference of 90° to sample the magnetic field signal. The magnetic field signal of this structure is easily affected by noise. The impact of stray magnetic field and ambient temperature; secondly, when angle demodulation, the arc tangent calculation is performed on the two sine and cosine signals to obtain the angle value. This angle solution requires high structural installation accuracy, and the conventional structure is difficult to meet the requirements; in addition, This algorithm has a large amount of calculation, requires high processor performance, and has a large delay in angle output, which is difficult to meet the requirements of real-time calculation.

The patent (patent number: ZL200520140332.6) provides a design scheme for a small single-turn absolute magnetoelectric encoder. The magnetic sleeve and the main shaft are designed separately, and the retaining ring is used as the axial limit of the main shaft, which cannot guarantee the rotation of the magnet. It is also difficult to guarantee the relative position accuracy of the magnet and the Hall sensor chip, so it is difficult to guarantee the high precision of the magnetoelectric encoder

[0004] Obviously, the magnetoelectric encoder using the existing technical solution cannot meet the high dynamic, high precision, and high reliability output requirements of the aerospace field for the magnetoelectric encoder, and does not have the characteristics of compact structure, anti-oil pollution, and anti-vibration

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