Method and device for automatically detecting and compensating zero position deviation of rotary transformer

Abstract

The invention discloses a method and a device for automatically detecting and compensating the zero position deviation of a rotary transformer. After output analog signals of the rotary transformer are decoded by a signal decoding circuit of the rotary transformer, the output analog signals are sent to a microcontroller. Current of a motor phase winding is detected by a Hall current sensor, and after the current is adjusted, the current is sent to the microcontroller by an analog-digital conversion circuit. The average value of sent voltage signals is calculated by the microcontroller. According to the current phase current average value and the last zero position deviation compensation value of the rotary transformer, the direction is adjusted, and then the best zero position deviation compensation value of the rotary transformer is calculated; and meanwhile, motor control signals of the microcontroller are subjected to power amplification by a power driving circuit for driving a tested motor to normally run. According to the method and the device disclosed by the invention, zero position deviation detection implementation steps of the rotary transformer are obviously simplified, the difficulty for detecting the zero position deviation of the rotary transformer is reduced, and the automatic compensation to the zero position deviation of the rotary transformer is realized. The method and the device for automatically detecting and compensating zero position deviation of the rotary transformer also have the advantages of convenience in operation, powerful adaptability and low cost.

Description

technical field [0001] The invention relates to a method and a device for detecting and compensating the zero position deviation of a rotary transformer. Background technique [0002] The resolver has the characteristics of reliable structure, good real-time performance, and strong environmental adaptability, and is widely used in the motor servo system to accurately detect the position of the servo motor rotor. The assembly error of the resolver during installation will lead to a deviation in the zero position of the resolver, resulting in a zero position deviation between the actual rotor position of the motor and the rotor position detected through the resolver. The existence of this zero position deviation will cause unexpected and uncontrollable direct axis current, which will cause the servo motor to fail to start or reverse in severe cases. At present, the commonly used methods to detect the zero position deviation of the servo motor rotor are the pre-positioning met...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the deficiencies of the existing rotary transformer zero position deviation detection method, such as large measurement error, high hardware requirements, and difficult engineering implementation, the present invention proposes a method for automatically detecting and compensating the rotary transformer zero position deviation, which can significantly simplify the detection of the rotary transformer zero position deviation. The implementation steps of position deviation reduce the difficulty of detecting the zero position deviation of the resolver, and realize the automatic compensation for the zero position deviation of the resolver. The operation is convenient, the adaptability is strong, and the cost is low

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