A space vector-based control method for five-phase dual-rotor permanent magnet synchronous motor

Abstract

The invention discloses a control method of a five-phase dual-rotor permanent magnet synchronous motor based on a space vector, comprising: measuring the rotational speed and output phase current of the motor; and calculating a target voltage vector in a stationary coordinate system according to the rotational speed and output phase current of the motor The two voltage components; the target voltage vector is the voltage vector that disappears in the output voltage after the one-phase open circuit fault of the motor; determine the sector where the target voltage vector is located according to the two voltage components; determine the voltage vector that has not disappeared, Dividing the undisappeared voltage vectors into large vectors, medium vectors, and small vectors according to their magnitudes; screening qualified voltage vectors from the undisappeared voltage vectors; using the qualified voltage vectors and zero vectors to synthesize the target Voltage vector. The control method disclosed by the invention gets rid of the dependence on the accuracy of motor modeling, reduces the interference of high-order harmonics, and has the advantages of smooth control, flexibility and fast action response.

Description

technical field [0001] The invention relates to the field of motor fault-tolerant control, in particular to a control method for a five-phase dual-rotor permanent magnet synchronous motor based on space vectors. Background technique [0002] In synchronous motor installations, the mechanisms most prone to failure are sensors, actuator mechanisms and motor windings. According to statistics, in the speed drive system, 38% of the faults are related to the converter. Among the 38% of the faults, the most common fault is one-phase open circuit fault, including: one-phase switch tube open circuit, phase bridge arm open circuit, one-phase switch tube short circuit and phase bridge arm short circuit. [0003] In the current academic literature and engineering practice, for the open-circuit fault of one phase of the five-phase motor, the method of directly calculating the input current of each phase is mostly used. This method relies on the accuracy of motor modeling, and it is dif...

AI Technical Summary

Problems solved by technology

This method relies on the accuracy of motor modeling, and it is difficult to achieve real-time control in engineering practice, and the current is controlled in a hysteresis mode, which can easily lead to unstable frequency of the switching tube and cause large high-order harmonics

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