Permanent magnet synchronous motor composite current constraint control system and construction method thereof

Abstract

The invention discloses a constraint control system for composite current of a permanent magnet synchronous motor and a construction method of the constraint control system. The problem of overcurrentprotection of a permanent magnet synchronous motor in a single-loop structure in the prior art is solved. The invention provides a constraint control system for composite current of a permanent magnet synchronous motor and a construction method of the constraint control system. The system comprises a first coordinate transformation unit, an encoder, a PI controller, a reduced-order proportional observer, a current constraint controller, a second coordinate transformation unit, an SVPWM module and a three-phase inverter, q-axis current is limited within a safe range through combination of thecurrent constraint controller and the reduced-order proportional integral observer, and hardware overcurrent burnout is prevented. According to the method, the overcurrent protection problem of the permanent magnet synchronous motor in a non-cascade structure is solved through the composite current constraint controller which is simple in structure and low in calculation complexity, the requirement for current constraint is met, good dynamic stability is guaranteed, and the method is easy to implement.

Description

technical field [0001] The present invention relates to the field of permanent magnet synchronous motor control systems, and more specifically, relates to a compound current constraint control system of permanent magnet synchronous motors and a construction method thereof. Background technique [0002] Permanent magnet synchronous motor (PMSM) has the advantages of simple structure, small size, light weight, high power and high efficiency, and is widely used in aerospace, CNC machine tools, robots, electric vehicles and other industrial fields. In order to accurately control the speed of the permanent magnet synchronous motor, a good control strategy is required. There are three speed control strategies for the permanent magnet synchronous motor: variable voltage variable frequency control, direct torque control, and vector control. Vector control is the most commonly used control strategy. It transforms the three-phase AC current of the motor stator into two mutually perpen...

AI Technical Summary

Problems solved by technology

The disadvantage is that this method involves many parameters, a large amount of calculation, and the implementation of the algorithm is more complicated.

Its disadvantage is that the model predictive control of the invention will encounter difficulties when dealing with model uncertainty and disturbance problems in the physical control system, and it also needs a large amount of calculation, which is not conducive to the realization of the method

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