Dead-beat prediction current control method for permanent magnet synchronous motor

Abstract

The invention discloses a dead-beat prediction current control method for a permanent magnet synchronous motor. The method aims at overcoming the defects of: easily influencing the permanent magnet synchronous motor by digital system delay, inductance parameter mismatching and the like when dead-beat prediction current control is carried out, mainly observing load torque and obtaining a dynamic proportionality coefficient according to a preset dynamic proportionality coefficient expression; and combining the stator current sampling value of the current period, the stator current estimation value of the next period and the stator current instruction value through a dynamic proportionality coefficient, and performing dead-beat prediction current control by taking the combined value as feedback current in a prediction current controller, so that high-performance control on the permanent magnet synchronous motor is achieved. On the premise that the dynamic response speed of the control system is kept, the problem that the control system is influenced by digital system delay and inductance parameter disturbance is solved, the transient response performance of the system is enhanced, andthe robustness of the system is improved.

Description

technical field [0001] The invention relates to the technical field of control of permanent magnet synchronous motors, in particular to a deadbeat prediction current control method of permanent magnet synchronous motors based on dynamic proportional coefficients. Background technique [0002] Permanent magnet synchronous motor has the advantages of high efficiency, high power density, high reliability, simple structure, small size, etc., and with the continuous improvement of the performance of permanent magnet materials in recent years, it is widely used in machining, aerospace, rail transit And other high-performance servo industry. In the existing permanent magnet synchronous motor control technology, we usually use vector control for it, specifically including the double closed-loop control of the speed outer loop and the current loop, in which the design of the current loop determines the dynamic response speed of the permanent magnet synchronous motor control system A...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the existing methods, to propose a permanent magnet synchronous motor deadbeat current control method based on the dynamic proportional coefficient, and to solve the problems caused by digital problems in the control system under the premise of maintaining the dynamic response speed of the control system. The problem of system delay and the influence of inductance parameter disturbance can enhance the transient response performance of the system and improve the robustness of the system

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