Sinusoidal or trapezoidal counter potential five-phase permanent magnet motor short-circuit fault-tolerant control method adopting dead-beat current tracking

Abstract

The invention discloses a sinusoidal or trapezoidal counter potential five-phase permanent magnet motor short-circuit fault-tolerant control method adopting dead-beat current tracking. According to the method, the third harmonic space of the five-phase permanent magnet motor in a fault state is fully utilized, and a fault-tolerant control strategy for the five-phase permanent magnet motor with sine counter electromotive force and trapezoidal counter electromotive force under the condition of a single-phase short-circuit fault is provided, so that the third harmonic space of the five-phase permanent magnet motor can be fully utilized during fault-tolerant operation of the five-phase permanent magnet motor. According to the invention, the performance of the output torque of the motor in a fault state is improved, and the fault-tolerant operation efficiency of the motor is improved, so that the motor can have better fault-tolerant performance and dynamic response; the speed regulation range during fault-tolerant operation of the motor is widened, so that the motor can be better applied to the application fields, such as electric vehicles, requiring high reliability and wide speed regulation range; and compared with a current hysteresis modulation method used in a traditional fault-tolerant algorithm, the switching loss of the inverter is reduced.

Description

Technical field[0001]The invention relates to the technical field of fault-tolerant control of multiphase motors, in particular to a single-phase short-circuit fault-tolerant control method of a five-phase permanent magnet motor. This method is suitable for aerospace, electric vehicles, ship propulsion systems and other occasions that have high requirements on the reliability of the motor.Background technique[0002]Because of its high torque density, high efficiency, and high reliability, five-phase permanent magnet motors have been widely used in electric vehicle traction, aerospace and marine cruise systems. At the same time, a stable and reliable motor drive system is particularly important for some occasions with high reliability requirements such as aircraft and electric vehicles. Therefore, the high-reliability fault-tolerant control method of permanent magnet motors has received extensive attention.[0003]For a five-phase permanent magnet motor, in addition to artificially inje...

AI Technical Summary

Problems solved by technology

However, these methods do not make full use of the third harmonic space of the five-phase motor, and most of these short-circuit fault-tolerant control strategies rely on the actual value of the motor's back EMF, which will bring errors to the fault-tolerant control.

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