Three-Hall magnetoelectric encoder and arc-tangent-free angle calculation method

Abstract

The invention relates to a three-Hall magnetoelectric encoder and an arc-tangent-free angle calculation method, and belongs to the field of manufacturing of magnetoelectric encoders. According to theinvention, the three Hall spaces are distributed at the included angles of 120 degrees; the rotating magnetic field is sampled to obtain three paths of sinusoidal signals with a phase difference of 120 degrees; a linear region obtained by intersection of three groups of sinusoidal signals is directly compared with a coaxially rotating photoelectric encoder angle value for table lookup to obtain amagnetoelectric encoder angle value after table lookup, the participation process of arc tangent calculation is eliminated in the process, and the angle value is calculated more rapidly.

Description

technical field [0001] The patent of the invention relates to a three-Hall magnetoelectric encoder and an arctangent-free calculation angle solution method, which belongs to the field of magnetoelectric encoder manufacturing. Background technique [0002] The encoder is used to measure the angular position of the motor rotor and is the core component for motor control. It is widely used in high-tech fields such as mechanical engineering, robotics, aviation, and precision optical instruments, and plays a vital role in modern industry. Magnetic encoders have the advantages of simple structure, high temperature resistance, oil resistance, impact resistance, small size, and low cost, and have unique advantages in miniaturization and harsh environmental conditions. [0003] The calculation of the angle value of the magnetoelectric encoder depends on the collection of the magnetic field signal. Under the action of the rotation of the rotor, a spatial rotating magnetic field is gen...

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Problems solved by technology

[0003] The calculation of the angle value of the magnetoelectric encoder depends on the collection of the magnetic field signal. Under the action of the rotation of the rotor, a spatial rotating magnetic field is generated. The Hall collects the spatial rotating magnetic field to obtain a voltage signal. Through the analog-to-digital conversion module, the digital signal is obtained, and the Hall The spatial coordinate projection of the digital signal is used to obtain the sine and cosine signals with a phase difference of 90°, and the angle value is obtained by calculating the arctangent. During the arctangent calculation process, there may be problems that the result is infinite and the denominator is 0, and the arctangent calculation process depends on the MCU. The function calculation module will take up a lot of program calculation time, resulting in the lengthening of the encoder calculation cycle, which is not conducive to the time-delay transmission of the angle value. The lengthening of the angle value calculation cycle will cause the control system to lag behind the reception of the angle value, resulting in the response of the control system slow down

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