Excitation-loss fault tolerance power generation method for four-phase electric-excitation doubly-salient motor

Abstract

The invention discloses an excitation-loss fault tolerance power generation method for a four-phase electric-excitation doubly-salient motor. Whether a system excitation part is in fault or not by detecting the value of an excitation current; if a fault does not occur, the four-phase electric-excitation doubly-salient motor performs uncontrollable rectifying power generation for a load through a full bridge converter, and output voltage closed-loop control is realized by regulating the excitation current; if a fault occurs, a fifth bridge arm is enabled and an excitation angle is set, and four-phase windings are pumped with forward and backward excitation currents through a four-phase five-bridge-arm converter, and excitation-loss fault tolerance power generation is realized based on magnetic resistance electric potential; and the closed loop control of the system power generation output voltage can be realized by regulating the excitation angle. By adding a redundant bridge arm on the conventional full-bridge converter, the excitation-loss fault tolerance power generation of the electric-excitation doubly-salient motor is realized; and the power generation method is simple in control and flexible and effective, and the reliability of the electric-excitation doubly-salient motor is improved, so that the power generation method has wide application prospects in the fields of aviation starting power generation, wind power generation and the like.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a fault-tolerant power generation method for a four-phase electric excitation doubly salient pole motor when it loses excitation. Background technique [0002] As a new type of brushless DC motor, the electrically excited double salient pole motor has the advantages of simple and reliable structure, flexible control, good fault tolerance, and is suitable for harsh working conditions. It has broad application prospects in aviation, wind power and other fields. The multi-phase electric excitation double salient pole motor can reduce the torque ripple, reduce the output voltage ripple of the generator, and improve the fault tolerance performance of the system. When operating as a generator, the electrically excited doubly salient motor supplies power to the load through uncontrolled rectification, and the output voltage is adjusted by adjusting the excitation current. The exci...

AI Technical Summary

Problems solved by technology

However, it cannot directly realize the excitation function of the loss-of-excitation fault according to the rotor position angle, and the actual implementation is complicated

[0004] Adding a redundant bridge arm on the basis of the full-bridge converter can realize the power generation function of the electrically excited doubly salient pole motor due to loss of field failure, but in the four-phase electrically excited doubly salient pole motor, the self-inductance of each phase armature In any sector, it changes with the rotor position. In the above-mentioned published patent, the windings in the self-inductance change range all supply power to the load, which will cause a short circuit of the fifth bridge arm in an electrically excited double salient pole motor driven by four-phase five-bridge arms. , can not realize the loss-of-excitation fault fault-tolerant power generation of the system

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