Electric car induction motor torque current setting device

Abstract

The invention provides an electric car induction motor torque current setting device. Based on the prior art, a high-speed torque controller, a weighing and calculating module and a torque current setting and calculating module are added. Meanwhile, an existing torque controller used for calculating set torque current is used as a low-speed torque controller. When an induction motor runs at low speed, the low-speed torque controller works, the weight of the low-speed torque controller is set as 1, and torque current i*sq is completely given by the low-speed torque controller. When the induction motor runs at high speed, the high-speed torque controller works, the weight of the high-speed torque controller is set as 1, and the torque current i*sq is completely given by the high-speed torque controller. When the induction motor runs in a switching transition zone, torque current is given by the high-speed torque controller and the low-speed torque controller, and a value of the torque current can be calculated and obtained according to the weight k. When the actual rotation speed of the induction motor increases, slow switching between two structures can be achieved through a slowly-changing weighing method in structural switching, control stability of the induction motor is improved, and torque control accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle induction motor control, and more specifically relates to a torque current setting device for an electric vehicle induction motor. Background technique [0002] With the development of society and the increasingly prominent issues of energy and environmental protection, electric vehicles have attracted more and more attention from all over the world due to their advantages of zero emission and low noise. Electric vehicles have become the development direction of the automobile industry in the 21st century and are green vehicles. One of the most important directions of development. As an important part of the "three-horizontal" technology, the drive motor and the motor drive controller are the direct supply mechanism that provides the driving power of the electric vehicle. The quality of its driving characteristics directly determines the driving performance of the electric vehicle. [00...

AI Technical Summary

Problems solved by technology

[0006] Usually, when the induction motor is controlled, the inductance parameter of the induction motor is considered constant. However, due to the influence of the flux saturation of the induction motor, the mutual inductance of the induction motor is not constant. When the mutual inductance of the induction motor changes, the traditional torque controller cannot gives accurate torque current, therefore, the torque controller needs to be redesigned

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