Zero-torque charging method for three-phase integrated charger of electric vehicle

Abstract

The invention relates to the technical field of electrics, and aims to provide a zero-torque charging method for a three-phase integrated charger of an electric vehicle. The method comprises that: a motor is separated from a mechanical transmission device; the current rotor position information of an electric vehicle driving motor is read; logic judgment is performed on the position information of the motor rotor; and a mode change-over switch is switched, the winding connection mode of the driving motor of the electric vehicle is reconfigured to a charging state, and a three-phase alternating current input from a power grid is accessed to realize three-phase zero-torque charging. Zero-torque charging is achieved based on a main circuit structure of a conventional three-phase integrated charging system, no hardware cost is increased, and zero-torque operation of the three-phase integrated charging system in the charging process can be achieved on the basis of original hardware. The method has no special requirements on a hardware circuit structure, is high in scheme universality, and has good applicability and transportability. The method is simple in scheme, good in universality and convenient to popularize and use.

Description

technical field [0001] The invention relates to electric vehicles and related technologies, and more specifically, relates to a zero-torque charging method of a three-phase integrated charger for electric vehicles, which belongs to the field of electric technology. Background technique [0002] Against the background of the increasing shortage of fossil energy, electric vehicles have attracted widespread attention in both industry and academia due to their advantages in energy saving and environmental protection, and their related technologies have also achieved rapid progress and development. For a long time, the charging technology of electric vehicles has been the core technology that people pay attention to and discuss. At present, the electric vehicle charging system is mainly divided into DC charging system and on-board AC charging system. The DC charging system needs to set up supporting high-power charging piles on the ground, which has high installation costs and po...

AI Technical Summary

Problems solved by technology

In a single-phase integrated charging system, the motor does not generate any electromagnetic torque during charging, so no additional mechanical locking and control measures are required; while in a three-phase integrated charging system, the electromagnetic torque of the motor during charging is related to the rotor position angle Related, the unfavorable rotor position may generate a large pulsating torque during charging, causing the motor to rotate, seriously affecting the safety and reliability of the charging process

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