Current error system without position sensor control and online correction method

Abstract

The invention provides a current error system without position sensor control and an online correction method. In a three-phase motor driver, an inverter is powered by a direct-current bus voltage; midpoints of three-phase bridge arms of the inverter are connected with three-phase windings of the motor; the three-phase windings of the motor forwardly pass through a signal acquisition port of a three-phase current sensor; a B-phase bridge arm lower branch input cable and a C-phase bridge arm lower branch input cable of the inverter forwardly pass through an A-phase current sensor signal acquisition port; and A and C two-phase bridge arm lower branch input cables of the inverter forwardly pass through a B-phase current sensor signal acquisition port, and A and B two-phase bridge arm lower branch input cables of the inverter forwardly pass through a C-phase current sensor signal acquisition port so that a bias error and a gain error of a current sensor are estimated. The system and the method are suitable for a three-phase motor driving system without a position sensor, a normal operation control strategy of the system does not need to be changed, a calculation burden generated by a microprocessor is small, few signal sampling points are needed, and an estimation speed is high.

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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