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Sine and cosine encoder correction method and system

A technology of a sine and cosine encoder and a correction method, applied in the field of encoder correction, can solve the problems of high calculation error of proportional value and offset, occupation of human resources, long test time, etc., and achieve the effect of improving efficiency and accuracy

Active Publication Date: 2020-05-05
清能德创电气技术(北京)有限公司 +1
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Problems solved by technology

[0004] Since the correction of the sine-cosine encoder in the prior art is a human operation, the calculation error of the ratio value and the offset is very high
In addition, when manually collecting sine and cosine waveforms, it is often necessary to re-acquire sine and cosine waveforms due to interference, which will cause long test time and occupy human resources

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  • Sine and cosine encoder correction method and system
  • Sine and cosine encoder correction method and system
  • Sine and cosine encoder correction method and system

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Embodiment Construction

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0050] The purpose of the present invention is to provide a sin-cos encoder calibration method and system, which are used to correct the sin-cos encoder in the working state, and improve the calibration speed and accuracy.

[0051] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embo...

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Abstract

The invention relates to a sine and cosine encoder correction method and device. The method comprises the steps: obtaining motor parameters; obtaining sine and cosine waveforms of a sine and cosine encoder when the motor operates at a low speed, wherein the low-speed operation of the motor is that the rotating speed of the motor is lower than the rated rotating speed; according to the sine and cosine waveforms of the sine and cosine encoder when the motor operates at a low speed, obtaining the maximum value and the minimum value of the sine and cosine waveforms in each period; according to themaximum value and the minimum value of the sine and cosine waveform in each period, obtaining a proportional value and an offset of the sine and cosine encoder; and correcting the sine and cosine encoder according to the proportional value and the offset. According to the invention, the correction of the sine and cosine encoder does not need manual operation, and the correction efficiency and precision can be remarkably improved.

Description

technical field [0001] The invention relates to the field of encoder correction, in particular to a sin-cosine encoder correction method and system. Background technique [0002] The sine-cosine encoder is suitable for the vector closed-loop control system of the motor, and is often used in the servo drive system, elevator control and other systems. The accuracy of the sine-cosine encoder directly affects the accuracy of the vector closed-loop control system. The sine and cosine encoder can accurately reflect the position and speed of the motor, and its sine and cosine signal can increase the accuracy by more than 4 times than the quadrature pulse encoder with the same number of lines. However, in the normal working process of the sine-cosine encoder, it is inevitable that deviations will occur due to the influence of the external environment, thus making the motor run abnormally. Therefore, it is necessary to calibrate the sin-cos encoder in working condition. [0003] In...

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Application Information

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IPC IPC(8): H02P6/06H02P6/17
CPCH02P6/06H02P6/17
Inventor 高振龙刘波汤小平
Owner 清能德创电气技术(北京)有限公司
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