Current sensor error fast online self-calibration motor drive system and control method

Abstract

The present invention provides a current sensor error rapid online self-correction motor drive system and control method, the inverter is powered by the DC bus voltage, the three-phase windings of the motor are respectively connected to the output three-phase interface of the inverter, and the motors A and B are connected to each other. The two-phase winding input cables pass through the signal acquisition ports of the A and B two-phase current sensors forward respectively, and the cables input to the positive end of the inverter also pass through the signal acquisition ports of the A and B two-phase current sensors forward respectively. The topological relationship between the final acquisition signal of the A and B two-phase current sensors and the switching state of the inverter, using the correlation table to analyze the estimation method of the bias error and gain error of the current sensor in different output voltage sectors, and sampling the current through the current sensor , directly, quickly and accurately estimate the bias error and gain error of the current sensor. The current sensor error estimation speed of the present invention is high, the efficiency is high, the precision is higher, the applicability of estimation is stronger, and the calculation amount of error estimation is smaller.

Description

technical field [0001] The invention relates to the field of motor drive control, in particular to a motor self-correcting drive system and a control method. Background technique [0002] Modern three-phase motor drive control technology has greatly improved the performance of the motor system. This performance improvement is largely dependent on each current sensor in the system. These high-precision current sensors are able to accurately collect and feedback the system current, and the closed-loop control of the system It can be realized to ensure the high-performance operation of the system. However, due to system aging, or harsh operating conditions, such as extreme temperatures, the accuracy of each current sensor in the system will inevitably be affected, resulting in offset errors and gain errors in the feedback signal, and ultimately affecting the overall performance of the system (such as Quoc NamTrinh, Peng Wang, Yi Tang, Leong Hai Koh, Fook Hoong Choo, "Compensat...

AI Technical Summary

Problems solved by technology

Solving many problems existing in the current sampling error correction method of the motor drive system in China, the present invention not only has the advantages of fast error detection speed and high precision, but also does not increase a large amount of complicated calculations, ensuring high-precision operation of the system

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