Double closed-loop control system of permanent-magnet synchronous motor

Abstract

The invention relates to a double closed-loop control system of a permanent-magnet synchronous motor. The control system is in a double closed-loop structure which can be set as a rotation speed current double closed-loop structure or torque current double closed-loop structure as required. The control system uses a DSP (digital signal processor) as a core CPU (central processing unit) to perform directional vector control and SVPWM (space vector pulse width modulation) to a rotor field, modularized programming of rotor field detection, double closed-loop control structure and a PID (proportion-Integration-Differentiation) algorithm is achieved, the structure of the control system can flexibly select whether an outer loop is rotation speed loop or a torque loop according to application requirements and can even perform closed-loop parallel connection to rotation speed and torque to switch according to the requirements for production process. Response speed and control precision of the control system can be increased, interference resistance of the system is improved greatly, and the control system has high extensibility compared with those in the prior art.

Description

technical field [0001] The invention relates to a motor control system, in particular to a double-closed-loop control system for a permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor (PMSM) control system has the advantages of high efficiency, high control precision, high torque density, good torque stability, low vibration and noise, etc. It has good application prospects in many fields and is widely used in electric vehicles, industrial Applications such as sewing machines, air conditioners, elevators, and higher-precision CNC machine tools and robots. Among them, the permanent magnet synchronous motor manufacturing technology and the permanent magnet synchronous motor control technology are two key technologies that determine the performance of the permanent magnet synchronous motor drive control system. The permanent magnet synchronous motor is a strongly coupled, time-varying, nonlinear system with complex control. C...

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Problems solved by technology

The advantage of vector control is that the speed range is wide and the dynamic performance is good; the disadvantage is that the vector control method needs to carry out complex coordinate transformation when it is realized, and needs to accurately observe the rotor flux linkage, and it is very dependent on the parameters of the motor, which is difficult to guarantee. Completely decoupled, the orientation according to the rotor flux linkage will be distorted by the influence of motor parameter changes, thus reducing the speed regulation performance of the system

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