Absolute position signal calibration system of hybrid photoelectric encoder and method thereof

Abstract

The invention discloses an absolute position signal calibration system of a hybrid photoelectric encoder and a method thereof. The system comprises a microprocessor and a power supply module. An input terminal of the microprocessor is connected to a photoelectric encoder signal conditioning circuit. An input terminal of the photoelectric encoder signal conditioning circuit is connected to an output terminal of the hybrid photoelectric encoder. An output terminal of the microprocessor is connected to a three-phase power driver. A servo motor is connected to an output terminal of the three-phase power driver. The method comprises the following steps that 1, the hybrid photoelectric encoder and the servo motor are coaxially installed; and 2, the hybrid photoelectric encoder detects an absolute position signal and a relative position signal of servo motor rotation, and the microprocessor uses the relative position signal of the servo motor rotation to correct the absolute position signal. In the invention, the design is reasonable, the system and the method are easy to realize and cost is low, usage and operation are convenient, calibration efficiency is high, manpower and material resources are saved, practicality is high, a usage effect is good and popularization and usage are convenient.

Description

technical field [0001] The invention belongs to the technical field of encoder absolute position signal calibration, and in particular relates to an absolute position signal calibration system and method 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 encoders, the accuracy of general a...

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 calibrate.

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