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Rotating transformer conversion method and converter based on FPGA (field programmable gate array)

A resolver and linear transformation technology, which is applied in the field of resolver decoding algorithms, can solve problems such as noise sensitivity, output lag, and resource occupation

Active Publication Date: 2015-07-22
TIANJIN UNIV
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Problems solved by technology

[0007] In order to overcome a series of problems of traditional methods such as noise sensitivity, output lag, and resource occupation, and achieve high-precision angular position output of the resolver, it has good performance

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  • Rotating transformer conversion method and converter based on FPGA (field programmable gate array)
  • Rotating transformer conversion method and converter based on FPGA (field programmable gate array)
  • Rotating transformer conversion method and converter based on FPGA (field programmable gate array)

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Embodiment Construction

[0058] The technical scheme adopted in the present invention is that the algorithm utilizes the inherent properties of the sine and cosine signals (such as having approximately linearity near the zero point), and obtains by performing operations such as addition, subtraction, comparison, and shifting on the two signals after demodulation of the resolver. The linearized angle value realizes high-precision decoding of the resolver. In this way, on the one hand, it avoids the noise sensitivity caused by the arctangent operation, and on the other hand, it also overcomes the problems of stability and lag that may be caused by closed-loop tracking. The specific implementation method is as follows: multiple channels of sine and cosine signals with different phases are obtained from the demodulation output of the initial resolver, and their approximate linear parts are taken in different intervals, which can be used as a preliminary estimate of the angle value after simple processing; ...

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Abstract

The invention relates to decoding algorithms of rotating transformers, aims at solving a series of problems like sensitive noise, delayed output and high resource consumption of conventional methods and realizing high-accuracy angle position output of the rotating transformers and good performance, and discloses a rotating transformer conversion method and a converter based on an FPGA (field programmable gate array). The rotating transformer conversion method includes the following steps: step 1, acquiring four sine and cosine signals different in phase; step 2, averagely dividing the whole period into eight parts according to symbol and amplitude of the signals; step 3, solving absolute value of the signals acquired in step 1; step 4, acquiring a preliminary estimation value of an angle theta. The rotating transformer conversion method and the converter are mainly applied to designing and manufacturing of the rotating transformers.

Description

technical field [0001] The invention relates to a decoding algorithm of a rotary transformer, and uses FPGA to realize the algorithm, belonging to the technical field of electronic information. Specifically, it relates to an FPGA-based rotary transformer linear transformation method and a transformer. Background technique [0002] The resolver is an electromagnetic absolute position sensor, its structure and principle are as follows: figure 1 As shown, it is essentially a small AC motor for measuring angles, which is used to measure the angular displacement of the rotating shaft of a rotating object. It consists of a primary winding connected to the stator side and a secondary winding connected to the rotor side. Its working principle is basically similar to that of ordinary transformers. The difference is that the primary and secondary windings of ordinary transformers are relatively fixed, so the ratio of the output voltage to the input voltage is constant, while the prim...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/16
CPCH02K24/00H02K2213/03
Inventor 左志强李耀王一晶朱志岐
Owner TIANJIN UNIV
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