Brushless double-fed motor driving system of electric vehicle and control method thereof

Abstract

The invention belongs to the fields of a driving device of an electric vehicle and a hybrid electric vehicle, and a control method thereof. The driving system provided by the invention comprises a brushless double-fed motor, a stator inverter, a rotor inverter, a stator / rotor winding relay control circuit, a motor driving and control module, a complete electric vehicle controller, an accumulator, a battery management unit and a current-voltage speed sensor, wherein the ports of the stator inverter and rotor inverter are respectively connected with the port of the accumulator; the port of the motor driving and control module is respectively connected with the ports of the stator inverter and rotor inverter; and the port of the motor driving and control module is connected with the port of the stator / rotor winding relay control circuit. The control method provided by the invention mainly comprises the following steps: judging the running state of a driving motor; and if the driving motor is in an asynchronous running state or a double-fed running state or the stator and rotor inverters have faults, successively and respectively executing the corresponding subprograms. The invention can enhance the control moment of a high-speed region of the vehicle, enlarge the speed regulating range, increase the recovery rate of energy and enhance the continuous voyage mileage of the electric vehicle.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle and hybrid vehicle driving systems and their control, and relates to a brushless doubly-fed motor driving system for electric vehicles applicable to high-performance speed regulation systems such as hybrid vehicles and electric locomotives and a control method thereof. Background technique [0002] The motor drive system is a key component of electric vehicles, and it determines the running performance of the vehicle under the premise that the vehicle battery technology has not yet made a breakthrough. There are three main types of motors used in electric vehicles: induction motors, switched reluctance motors, and permanent magnet motors. The induction motor has simple structure and high reliability. The application of vector control and direct torque control makes it have excellent characteristics similar to DC motors, but the flexibility of energy flow control is poor. Wound induction ...

AI Technical Summary

Problems solved by technology

The structure of the switched reluctance motor is simple and strong. It not only has the high efficiency and high reliability of the asynchronous motor vector control system, but also has the good control characteristics of the DC speed control system. However, it has large noise and serious torque ripple. It is used to drive the car. The stability is poor; the permanent magnet motor has the characteristics of high efficiency, high control precision, high torque density, and low noise, and has high application value in the driving of electric vehicles. Complicated; permanent magnet materials are scarce resources and expensive; and permanent magnets have demagnetization problems, and the cost is relatively high, which restricts the application of permanent magnet motors in automobiles

[0003] The biggest disadvantage of traditional doubly-fed motors is the existence of brushes. The structure of brushless doubly-fed motors overcomes the fatal weakness of double-fed operation of wound motors, but its application is still very limited. At present, most of the applications of doubly-fed motors are concentrated in power generation. , and the application of brushless doubly-fed motors to the driving system of electric vehicles and hybrid electric vehicles has not been reported yet

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