A motor driving system for an electric vehicle and an electric vehicle

Abstract

The invention discloses a motor driving system for an electric vehicle and an electric vehicle. The motor driving system comprises a three-phase alternating current motor and a controller group for controlling the three-phase alternating current motor. The stator of the three-phase alternating current motor adopts two or more winding units, and the three-phase alternating current motor is a permanent magnet motor. The controller group includes motor driver units electrically connected with each winding unit, and each motor driver unit is used for controlling the operation of the correspondingwinding unit. Wherein, the controller group performs centralized coordinated management control on the running state of each motor driver unit; Each motor driver unit includes an electrically connected battery and a controller, respectively. The invention effectively improves the technical bottleneck of unreliable performance and low cost of the electric vehicle in the medium and high power marketat present, and can effectively promote the development process of the future electric vehicle market to realize higher power and high performance on the premise of medium and low cost.

Description

technical field [0001] The invention belongs to the field of motors, and in particular relates to a motor drive system for an electric vehicle and the electric vehicle. Background technique [0002] Just as the Chinese invention patent application with the publication number CN102497055A records in its background technology: traditional motors, especially medium and high-power motors, as an important component of the motor drive system, generally use a single large-capacity power driver to directly drive the motor in practical applications. Or use multiple small-capacity drivers to drive the motor in parallel, which is to combine multiple small-capacity drivers into a large-capacity driver; the driver can be directly connected to the motor, and the structure is simple, but because the traditional motor is a single set of winding structure, the large-capacity driver and In the complex application environment of traditional motors, the reliability of both of them is reduced to...

AI Technical Summary

Problems solved by technology

[0004] However, the applicant found that the design of setting multiple sets of functional windings in the stator makes the winding process complicated. Setting multiple sets of windings in the stator slot at the same time requires high insulation for the stator slots, and the insulation is prone to failure, resulting in coil short circuits. , which requires high manufacturing of the stator structure and poor reliability of the motor

[0005] It should also be pointed out that CN102497055A adopts multiple small-capacity drivers to control each set of functional windings respectively, although to a certain extent it solves the problem of unreliability and high cost of using large-capacity drivers (combined by single or multiple small-capacity) problem, however, the applicant found that due to the use of multiple drivers, it will lead to differences in relevant parameters between the drivers or failure of some components, which will lead to failure or uncontrolled control of the entire drive system, and the fault tolerance rate is poor. Moreover, when this technology is applied to the field of electric vehicles, it is difficult to achieve unified charging management due to differences in the batteries of various drivers. Therefore, this technology cannot be applied in the field of electric vehicles;

[0006] Due to the existence of the above technical problems, the disclosed technology of CN102497055A has many technical bottlenecks and has not been implemented in practical applications. Therefore, the current situation of using large-capacity drivers for medium and high-power motors has not been actually improved. This is obviously in line with the pursuit of It is against the development direction of the future electric vehicle market to achieve higher power and high performance under the premise of medium and low cost, so the market urgently needs to solve the above technical problems

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