System and method for determining correction values of absolute position signals of hybrid photoelectric encoder

Abstract

The invention discloses a system and method for determining correction values of absolute position signals of a hybrid photoelectric encoder. The system comprises a microprocessor, a hall current sensor, a power supply module, an A / D conversion circuit module, a photoelectric encoder signal conditioning circuit, a current signal conditioning circuit and a three-phase power driver for driving a servo motor with the hybrid photoelectric encoder. The method comprises the following steps of (1) coaxially installing the hybrid photoelectric encoder and the servo motor; (2) obtaining installation error correction values of the hybrid photoelectric encoder; (3) obtaining the correction values of the absolute position signals when an installation error is not considered under the condition of not considering the installation error of the hybrid photoelectric encoder; and (4) determining the final error correction values of the absolute position signals of various sectors of the hybrid photoelectric encoder. The system and the method are reasonable in design, convenient to implement, low in cost, convenient to use and operate, high in correction efficiency, high in correction accuracy and high in practicability; manpower and material resources are saved; and promotion and application are facilitated.

Description

technical field [0001] The invention belongs to the technical field of encoder absolute position signal calibration, and in particular relates to a system and method for determining a correction value of an absolute position signal of a hybrid photoelectric encoder. Background technique [0002] In the field of servo motor control, in order to accurately control the position or speed and improve the control performance of the servo motor, it is often necessary to know the initial position of the rotor and the position and speed information during operation, which can be obtained by installing a rotor position sensor. Among them, the incremental photoelectric encoder with absolute position information U, V, W has the characteristics of initial positioning information, high position recognition accuracy, and moderate price, and is widely used in the field of motor rotor position and speed detection that requires initial positioning information. For hybrid photoelectric encoder...

AI Technical Summary

Problems solved by technology

[0003] Like other types of sensors, there are deviations in both the absolute position signal and the relative position signal in the hybrid photoelectric encoder. Due to the low accuracy of the absolute position signal and the large deviation range, this has a great impact on the starting performance of the servo motor; When absolute position signals are used for position and speed monitoring or control in operation control, corresponding errors will also be introduced, which will affect the control performance of the servo system

Therefore, it is necessary to calibrate and calibrate the absolute position signal. At present, the absolute position signal of the hybrid photoelectric encoder is calibrated by the manufacturer, and the user has no effective way to correct it.

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