Fault-tolerant control method for single-phase open-circuit fault of six-phase permanent-magnet synchronous linear motor

Abstract

The invention discloses a fault-tolerant control method for a single-phase open-circuit fault of a six-phase permanent-magnet synchronous linear motor. The fault-tolerant control method comprises the following steps: when the single-phase open-circuit fault of the six-phase permanent-magnet synchronous linear motor occurs, selecting a fault nominal model support vector machine and a fault controller by a flux linkage observation switching module; taking a deviation between a set speed and a speed fed back by a speed detection module and a deviation between set stator flux linkage and stator flux linkage observed and fed back by the flux linkage observation switching module as input signals of a fault internal model controller; outputting set stator shaft current by the fault internal model controller; comparing the set stator shaft current with actual current of the motor, and performing calculation through a PI (Proportional-Integral) regulator; performing Park inverse transformation and Clark inverse transformation on an output quantity to generate a PWM (Pulse-Width Modulation) signal for controlling an inverter; generating current with a variable frequency and a variable amplitude, and inputting the current into a motor stator; and implementing fault-tolerant control on the motor. The fault-tolerant control method has the beneficial effects that the support vector machine acquires a normal-state nominal model and a fault-state nominal model of the motor respectively; and an internal model control method is adopted, so that high robustness is realized.

Description

technical field [0001] The invention relates to the technical field of six-phase permanent magnet synchronous linear motors, in particular to a fault-tolerant control method for single-phase open-circuit faults of six-phase permanent magnet synchronous linear motors. Background technique [0002] The six-phase permanent magnet synchronous linear motor has many advantages such as low voltage, high power, and small harmonic loss, and has a good application prospect, especially suitable for important fields such as warship and submarine propulsion, aerospace propulsion, electric vehicle drive, and electric locomotive traction. [0003] The number of stator phases of the six-phase permanent magnet synchronous linear motor is more than three. When the single-phase open circuit fault of the stator winding occurs, the existing fault-tolerant control methods have certain deficiencies. Contents of the invention [0004] The object of the present invention is to provide a fault-tole...

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Problems solved by technology

[0003] The number of stator phases of the six-phase permanent magnet synchronous linear motor is more than 3 phases. When the single-phase open circuit fault of the stator winding occurs, the existing fault-tolerant control methods have certain deficiencies.

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