Research On Back To Back Inductosyn Angle Measuring System

In various types of position measuring device, inductosyn is widely used inelectrical industry. The precision of the inductosyn is determined by its own errorand the error measurement of inductosyn usually need higher precision measuringdevices, so it puts forward higher requirements on precision of measuring devices.Therefore, it is necessary to use a reasonable method to separate the error ofinductosyn and to achieve the desired compensation purpose through theestablishment of reasonable error compensation model without a need of higherprecision angle measuring equipment.The error separation method of inductosyn, combination intercomparsion, hasbeen introduced in this paper combining with the actual situation of the inductosynmeasurement. The types of combination intercomparsion are more than one, so twocalculation forms of combination intercomparsion have been discussed in this paperand it proves the second algorithm is accurate and the sum of residual squares isminimum. In order to illustrate the correctness of the second algorithm, the origin ofthe second algorithm is analyzed according to least-square method. At the same time,considering the introduction of actual situation measuring errors, the paper showsthat it has correlation of residual errors after error separation and measuring errorsintroduced by the actual situation, and residual errors can reflect the size ofmeasuring errors.The structure design of back-to-back inductosyn is totally analyzed in thispaper. The main purpose of back-to-back inductosyn is to achieve error separationalgorithm, combination intercomparsion. A suitable inductosyn structure is putforward based on the actual operation mode of combination intercomparsion.Considering two inductosyn independent rotation, the inductosyn separation ofinductosyn rotor and shaft system and the overall installation problem, theseproblems are analyzed and solutions are given.The main circuit structure design of back-to-back inductosyn angle measuringsystem is studied in this paper. The operating principle working in the situation ofamplitude discrimination mode is analyzed. Hardware circuit of the angle measuringsystem is designed. The software design of the angle measuring system is completedand real-time sampling method and real-time output method are realized from twoaspects of the main program and subroutine design. A experimental platform for theangle measuring system has been set up and the construction and debugging of theexperimental platform is completed based on the previous theoretical design. Itproves that the experiment platform can complete the angle position information acquisition, conversion and display functions.The inductosyn error forms are discussed in this paper, and the error models areestablished according to the characteristics of the pinch error and subdivision errormodel to achieve the purpose of error fitting. The error compensation can berealized through the reasonable mathematical error data model establishment basedon FFT. Through two back-to-back inductosyns actual experiment, it proves thecorrectness of the error separation algorithm and error compensation model.Through reasonable error separation and compensation, high-accuracy inductosynmeasurement can be achieved with no higher precise measuring equipment.