Abstract
To eliminate the jump points of multipole angle values after subdivision at low temperature, the magnetic field and temperature field characteristics of a multipole magnetic encoder are analyzed in this study, and the effect of changes in magnetic field strength and temperature field on the precision of angle values is studied. To eliminate the jump point of multipole angle values caused by changes in the temperature field, the suppression method based on single-pole angle value fitting is proposed. The error between the single-pole and multipole angle values is tabulated by the oversampling linear interpolation method, and the precision of fitting single-pole to multipole angle values is effectively improved. The error of the angle value caused by changes in the temperature field is studied and analyzed, and the relationship between the jump angle values and the pole number of the multipole magnetic encoder is obtained. Furthermore, the jump point is compensated for by the jump range of the multipole angle values. Finally, the angle accuracy of the multipole magnetic encoder in a cryogenic chamber is experimentally verified. The experimental results show that the low-temperature jump point compensation method proposed for the multipole magnetic encoder in this paper can effectively suppress the jump of the angle values.
Highlights
With the accelerated development of industrialization, people have high requirements for the resolution and precision of angular displacement sensor
A novel algorithm based on polynomial approximations (PA) is proposed; this algorithm is used for an efficient error compensation of magnetic analog encoders
The wave equation of angular displacement with amplitude error, waveform distortion, and DC component is established, and the orthogonal error correction parameter is solved by the least square method, which improves the precision of the encoder [18]
Summary
With the accelerated development of industrialization, people have high requirements for the resolution and precision of angular displacement sensor. In order to eliminate the output deviation of the magnetic encoder, the signal correction algorithm based on the least square estimation is proposed [4]. The Hall effect sensors are equilaterally arranged; it can eliminate harmonics of the third order and its multiples and improves the accuracy of the magnetic encoder [6]. A compensation method based on PMSM sensor less control is proposed It can eliminate the angle deviation of the magnetic encoder. A new error compensation model based on genetic algorithm is proposed; it can improve the precision of the magnetic encoder. A real-time controller has been proposed to develop a correction and interpolation algorithm and successfully optimized the magnetic encoder signal. The lowtemperature jump point compensation method proposed for multipole magnetic encoder in this paper can effectively suppress the jump of angle value
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