Background:
The application of magnetic encoder relieves the problem of reliable application
of servo system in vibration field. The magnetic encoder raises the efficiency and reliability of the
system, and from structural considerations, the magnetic encoder is divided into two parts: signal conversion
and structural support.
Objective:
In order to improve the accuracy of the magnetic encoder, its structure is constantly improving.
To evaluate a magnetic encoder, the accuracy is a factor, meanwhile, the structure of magnetic encoder
is one of the key factors that make difference in the accuracy of magnetic encoder. The purpose of
this paper is to study the accuracy of different structures of magnetic encoder.
Methods:
This paper reviews various representative patents related to magnetic encoder.
Results:
The differences in different types of magnetic encoders were compared and analyzed and the
characteristics were concluded. The main problems in its development were analyzed, the development
trend forecasted, and the current and future developments of the patents on magnetic encoder were discussed.
Conclusion:
The optimization of the magnetic encoder structure improves the accuracy of magnetic encoder.
In the future, for wide popularization of magnetic encoder, modularization, generalization, and
reliability are the factors that practitioner should pay attention to, and more patents on magnetic encoder
should be invented.
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.
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