All-digital RDC decoding system with error suppression function

An error suppression and all-digital technology, applied to devices using electric/magnetic methods, measuring devices, instruments, etc., can solve problems such as complex algorithms, not easy to implement, speed up the response process of phase-locked loops, etc., to improve control performance , the effect of improving the accuracy

Inactive Publication Date: 2019-11-08
CRRC YONGJI ELECTRIC CO LTD
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Problems solved by technology

The second prior art determines the decoupling input parameters according to the rotor speed obtained by the phase-locked loop, thereby speeding up the response process of the phase-locked loop, and can suppress the errors caused by amplitude imbalance and phase non-orthogonality, but the algorithm is relatively complicated, not easy to achieve

Method used

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Embodiment Construction

[0033] resolver section

[0034] The resolver is a special measuring motor. The rotor and the rotor of the permanent magnet synchronous motor are connected through a mechanical structure. The stator contains a primary winding for excitation and two secondary windings for feedback, such as figure 2shown. When working, the R1-R2 winding inputs the sinusoidal excitation signal V for excitation from the external circuit r , with the rotation of the motor, the feedback windings S2-S4 and S1-S3 output a sine-cosine feedback signal V related to the motor position a , V b ,Such as image 3 shown. The expression of the excitation signal is shown in formula (1), and the expression of the sine-cosine feedback signal is shown in formula (2).

[0035] V r =V p ×sin(ωt)(1)

[0036]

[0037] In the formula, V p is the amplitude of the excitation signal, sin(ωt) is the frequency of the excitation signal, V q is the amplitude of the sine-cosine feedback signal, θ is the shaft ang...

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Abstract

The invention relates to signal processing of a rotary transformer, in particular to an all-digital RDC decoding system with the error suppression function. According to the invention, an error causedby the amplitude imbalance and t phase non-orthogonality of the rotary transformer output signal is analyzed and thus an all-digital RDC decoding system with the error suppression function is put forward. Amplitude and phase correction is performed on inputted sine and cosine signals to obtain sine and cosine signals with characteristics of amplitude balance and phase quadrature; a tracking typeaxial angle digital converter carries out analysis to obtain a rotor position and rotational speed of a permanent magnet direct drive motor. With the provided method, the accuracy of the analyzed rotor position and rotational speed of the rotary transformer can be improved and thus the control performance of the permanent magnet direct drive motor can be improved further. The method is not only suitable for the high-power permanent magnet direct-drive electric locomotive but also suitable for application occasions of various permanent magnet synchronous motors with rotary transformers as position sensors.

Description

technical field [0001] The invention relates to signal processing of a rotary transformer, in particular to an all-digital RDC decoding system with an error suppression function. Background technique [0002] The permanent magnet motor traction system has significant advantages such as low loss, high efficiency, good starting characteristics, strong acceleration performance, and low noise. It represents the future technological development trend of energy saving, emission reduction, and environmental protection, and has become the development direction of the next generation of traction systems. Direct transmission technology has the advantages of solving transmission loss, noise and maintenance problems, reducing the overall weight of the vehicle, improving transmission efficiency, and providing more free space for bogie design. At present, the high-power permanent magnet direct-drive electric locomotive jointly operated by CRRC Yongji Electric Co., Ltd. and Datong Electric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/14G01B7/00G01P3/46
CPCG01B7/003G01D5/14G01P3/46
Inventor 丁志勇张瑞峰张吉斌路瑶王彬詹哲军梁海刚
Owner CRRC YONGJI ELECTRIC CO LTD
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