Space vector modulated method for linearly regulating speed of torque angle of permanent magnet flux switching motor

Abstract

The invention discloses a space vector modulated method for linearly regulating speed of a torque angle of a permanent magnet flux switching motor, and belongs to a method for regulating speed of a stator permanent magnet electrical machine. The speed regulating method defines an included angle between a stator flux vector of the permanent magnet flux switching motor and an unloaded permanent magnet flux vector, establishes a linear relation between a synthesized space vector and the torque angle, and controls torque by selecting the synthesized space vector to directly and linearly regulate a sine value of the torque angle of the permanent magnet flux switching motor. The method combines the characteristics of vector control for linearly regulating the torque and direct torque control for directly regulating the torque angle, no electric current link, and no coordinate conversion, and has simple realization, only identification of stator flux, strong parameter robustness, small current harmonics, torque pulsation and flux fluctuation, and good speed regulating performance.

Description

technical field [0001] The invention relates to a method for direct linear speed regulation of the torque angle of a permanent magnet switch flux linkage motor based on space vector modulation. Background technique [0002] At present, the commonly used control systems for permanent magnet switch flux linkage motors are vector control systems and direct torque control systems. Vector control theoretically solves the problem of high-performance control of AC motor torque, and is soon transplanted to synchronous motors. The basic idea of ​​vector control is derived from the rigorous simulation of DC motors. The DC motor itself has good decoupling, and it can control the motor torque by controlling its armature current and excitation current respectively. The vector control divides the stator current into the excitation component and the torque component through the field orientation of the motor, and controls them separately, so as to obtain good decoupling characteristics. ...

AI Technical Summary

Problems solved by technology

The disadvantages of direct torque control are as follows: the hysteresis link control is adopted for the stator flux linkage and electromagnetic torque, the flux linkage amplitude and torque have pulsation, the stator current harmonic content is high, and its steady-state control performance is not as good as that of vector control

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