Permanent magnet fault-tolerant motor driving system for electric vehicle and control method thereof

Abstract

The invention discloses a permanent magnet fault-tolerant motor driving system for an electric vehicle and a control method of the permanent magnet fault-tolerant motor driving system. The system comprises a permanent magnet fault-tolerant motor, a power switch tube, a brake resistor, two bidirectional thyristors, an independent direct-current power supply and two electrolytic capacitors. The method comprises the following steps: acquiring the current of a motor winding and the position angle of a rotor, and solving the mechanical angular velocity of the rotor; sending the current to a fault diagnosis device for fault diagnosis, sending a diagnosed fault signal to a fault processor for processing the signal, and changing the state of a corresponding bidirectional thyristor into a closed state; respectively outputting a given torque through a PI regulator for a given rotor mechanical angular velocity and an actual rotor mechanical angular velocity, and directly sending the given torque,the position angle of the rotor and a fault result to a direct-current controller, processing to output a current set value of each phase, obtaining a driving signal of an inverter, and driving the motor to operate in a fault-tolerant mode. According to the invention, the system is high in reliability, strong in fault-tolerant capability and high in motor output performance. The system can realize the fault-tolerant operation of different electrical faults independently or simultaneously.

Description

technical field [0001] The invention relates to the field of a permanent magnet fault-tolerant motor drive system and a control method thereof, in particular to a permanent magnet fault-tolerant motor drive system for an electric vehicle and a control method thereof. Background technique [0002] The electric drive system of electric vehicles is the heart of the whole vehicle system. It is mainly composed of drive motors, drive topology and control technology. They have emerged one after another, and even made major breakthroughs in some core technologies. [0003] However, because electric vehicles currently have the problem of poor adaptability when the electric vehicle works in harsh environments such as rain, snow, high and low temperature, and the problem that personal safety will be endangered when the electric drive system of the electric vehicle fails. Especially in the highway scene, once the driving system of the car fails, under the action of inertia, the car wil...

AI Technical Summary

Problems solved by technology

However, the current permanent magnet fault-tolerant motor drive system requires a large number of independent power supplies, a large number of power switch tubes, and the overall capacity-to-power ratio is not large enough, and the reliability and fault-tolerance capability need to be further improved.

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