Demodulation method of differential circular inductosyn

Abstract

The invention discloses a demodulation method of a differential circular inductosyn. The demodulation method comprises the following steps: acquiring a main value interval electrical angle of a coarsechannel and a main value interval electrical angle of a fine channel, and acquiring a first mechanical angle; performing synchronous compensation correction on each period of the main value intervalelectrical angle of the coarse channel and each period of the main value interval electrical angle of the fine channel to obtain a corrected main value interval electrical angle of the coarse channeland a corrected main value interval electrical angle of the fine channel; obtaining a second mechanical angle according to the corrected main value interval electrical angle of the coarse channel andthe corrected main value interval electrical angle of the fine channel; judging whether the corrected main value interval electrical angle of the coarse channel and the corrected main value interval electrical angle of the fine channel are adjacent or not according to a preset condition, and obtaining the period number of the fine channel electrical angle according to the judgment result and the second mechanical angle; and obtaining a third mechanical angle according to the period number of the fine channel electrical angle and the corrected main value interval electrical angle of the fine channel. The measurement precision of the mechanical angle is improved.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a demodulation method of a differential circular induction synchronizer. Background technique [0002] In the high-precision control moment gyroscope and turntable control system, the angle measurement system is a key component. The circular induction synchronizer is an electromagnetic induction sensing element used to detect the mechanical rotation angle. It is essentially a planar winding multi-pole resolver. Due to a series of advantages such as small size, light weight, impact resistance, radiation resistance, and high vacuum resistance, it has been widely used in harsh environmental conditions, and its application in aerospace has become more prominent in recent years. Traditional inductosynchronizers usually have two sets of windings, which are independent of each other, and are generally called coarse channel and fine channel; the fine channel has multiple pairs of poles,...

AI Technical Summary

Problems solved by technology

Traditional inductosynchronizers usually have two sets of windings, which are independent of each other, and are generally called coarse channel and fine channel; the fine channel has multiple pairs of poles, and the accuracy can reach the order of arc seconds; Angle-graded and unique null easily affected by temperature

In order to overcome this shortcoming, a differential circular induction synchronizer came into being. Its biggest advantage is that the zero position of the coarse and fine channels is not affected by temperature, and the accuracy of the coarse channel can also reach the order of arc seconds, but the coarse channel is not like the traditional The type inductive synchronizer has only 1 pair of poles, and it is also multi-pole, usually only 1 pair of poles less than the fine channel, so the coarse channel cannot use it to directly determine the number of cycles, it also needs the angle data of the fine channel, through the coarse and fine channel The angle data of the channel is calculated to obtain its cycle number. After the cycle number is obtained, it is combined with the fine channel data to obtain the mechanical absolute angle. In addition, due to the processing technology of the rough and fine channels, it is impossible to ensure that the rough and fine channels are strictly linear, resulting in The combined mechanical angle is not continuous, smooth, or even has periodic jumps, which results in a decrease in the performance of the servo control system, or even out of control. Therefore, the coarse and fine channels must be corrected, and when combining the mechanical absolute angle data, it is necessary to It is determined according to whether the coarse and fine data are "adjacent", so it is necessary to design a demodulation or solution method based on a differential circular induction synchronizer

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