High dynamic response current control method and system for permanent magnet synchronous motor

Abstract

This invention discloses a method and a system for permanent magnet synchronous motor high-dynamic response current control. The method comprises: preferably adopting an improved dutyfactor updating strategy, namely updating and calculating a new dutyfactor at the peak value of a calculator in first half control cycle and combining the fact that adopting various current inner ring adjustment strategies according to the characteristics of a q axis and a d axis, realizing feedback values following upper command by half a control cycle ahead of time; adopting predictive control in a torque current ring to connect the pure integration to eliminate the influence caused by inaccurate parameters and adopting PI control in exciting current to grantee the stability and easy reliability of the system. As a result, the invention can further shorten control delay and sensitivity of system parameters.

Description

technical field [0001] The invention relates to a permanent magnet synchronous motor technology, in particular to a high dynamic response current control method and system for a permanent magnet synchronous motor. Background technique [0002] Due to the advantages of high efficiency, high power density, and no carbon brushes, permanent magnet synchronous motors have been widely used in high-performance servo applications. Applications such as CNC machining centers and industrial robot drives require fast electromagnetic torque response to ensure the smooth operation of the entire system. High dynamic performance, therefore, the dynamic characteristics of the current loop, which is directly related to the electromagnetic torque, has become one of the most important indicators to measure the performance of the servo. [0003] The permanent magnet synchronous motor is a multivariable, strongly coupled, nonlinear system. For the convenience of research, the following assumption...

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Problems solved by technology

[0010] Predictive control can achieve fast tracking of the command signal without overshoot, but it relies on the precise mathematical model of the controlled object, and various improvement methods have been proposed, such as obtaining the precise mathematical model of the controlled object through the method of parameter online identification, To eliminate the influence of inaccurate parameters on the effect of predictive control, some scholars proposed a robust current control algorithm based on the principle of deadbeat predictive control, which enhanced the stability of the system when the model parameters were inaccurate, while some scholars adopted a relaxed current control algorithm. The deviation constraints and the smooth output voltage prediction method enhance the robustness of the system when the motor inductance parameters are mismatched, but reduce the dynamic performance of the predictive control to a certain extent. For the digital control system, based on the deadbeat control scheme, a single Sampling sheet update can shorten current loop control delay to 2 control cycles

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