A current error system and on-line correction method without position sensor control

Abstract

The invention provides a current error system and an online correction method without position sensor control. In a three-phase motor driver, the inverter is powered by the DC bus voltage, and the midpoints of the three-phase bridge arms of the inverter are connected to the three-phase motors respectively. The windings are connected, and the three-phase windings of the motor pass through the signal collection port of the three-phase current sensor in the forward direction, and the input cables of the lower branches of the two-phase bridge arms of the inverter B and C pass through the signal collection port of the A-phase current sensor in the forward direction, and the The input cables of the lower branches of the two-phase bridge arms of the inverters A and C pass through the signal collection port of the B-phase current sensor forwardly, and the input cables of the lower branches of the two-phase bridge arms of the inverters A and B pass forwardly through the C The phase current sensor signal acquisition port estimates the bias error and gain error of the current sensor. The invention is suitable for a three-phase motor drive system without a position sensor, does not need to change the normal operation control strategy of the system, has a small calculation burden on the microprocessor, requires fewer signal sampling points, and has a fast estimation speed.

Description

technical field [0001] The invention relates to the field of motor drive control, in particular to a current error system and an online correction method. Background technique [0002] A three-phase motor driver is usually composed of an inverter, a microprocessor, a three-phase current sensor, a position sensor, related cables, and related circuits. Closed-loop control. Therefore, the control performance of the system largely depends on the accuracy of the current feedback signal to restore the real signal. A high-precision current feedback signal can guarantee the high performance of the system, while a current feedback signal containing errors will cause the system to be unbalanced. Harmful phenomena such as three-phase current, torque ripple, and speed fluctuation. At the beginning of an actual controller design and manufacture, all aspects of performance and parameters are in an ideal state, so the error of the current sensor is relatively small. However, due to vari...

AI Technical Summary

Problems solved by technology

In order to solve many problems faced by the existing current sensor error correction technology for motor drivers without position sensors, the present invention provides an online self-correction control scheme for current sensor errors in motor drive systems without position sensors, which not only has a system Normal function without position sensor control, and provide online accurate calibration solution for the error problem of current sensor

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