A fault-tolerant driving system of a four-phase electrically excited doubly salient motor and a method for establishing a dynamic model thereof

Abstract

The invention discloses a fault-tolerant driving system of a four-phase electric excitation doubly salient motor and a method for establishing a dynamic model thereof. The system is composed of two main bodies of a four-phase electric excitation doubly salient motor and a fault-tolerant converter. The fault-tolerant converter is a four-phase full-bridge converter with two bi-directional thyristorsand the converter has a splitting capacitor. The method includes listing the voltage equation of a four-phase DSEM one-phase winding; The voltage equations of channel U and channel V during system operation are listed. The parameters in the voltage equation are replaced by equivalent parameters, and the voltage equation is simplified. According to the motor torque equation and motion equation, anequation related to current is obtained. Combining the voltage equation with the current-related equation, the system model is obtained.

Description

technical field [0001] The invention relates to a fault-tolerant control system and method of a motor drive system, in particular to a fault-tolerant drive system of a four-phase electric excitation double salient pole motor and a method for establishing a dynamic model thereof. Background technique [0002] In aerospace and other occasions that require high reliability, it is required that the motor system can continue to operate stably after a certain fault occurs, and the research on fault-tolerant control technology is of great significance. The electrically excited doubly salient motor has the advantages of simple structure, flexible control and high reliability. It is easy to realize field weakening control during electric operation and voltage regulation control during power generation operation. It has broad application prospects in aviation starting / generating systems. DSEM stator and rotor are salient pole structures, there is no winding or permanent magnet on the ...

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Problems solved by technology

[0004] In the existing inventions about using doubly salient motors to build a high-reliability starting power generation system, there are certain achievements in the topology of the motor body and the topology of the control circuit, but there are still few models for fault-tolerant systems. The present invention mainly Based on a fault-tolerant drive system of a four-phase electric excitation doubly salient pole motor, the voltage and motion equations during normal operation and single-phase open-circuit fault fault-tolerant operation are calculated, and the dynamic structural model of the system is given on this basis

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