Design method of sensorless sliding mode observer for electrical vehicle motor

Abstract

The invention relates to an electrical vehicle motor sensorless design method and discloses a design method of a sensorless sliding mode observer for an electrical vehicle motor. The method includes estimating the motor rotor position and speed information and implementing the sensorless speed control of the electrical vehicle. According to the method, the switching function and filter of a traditional sliding mode observer are optimized, the good adaptive function is provided, the 'vibration' caused by the traditional sliding mode observer is reduced effectively, a back EMF estimation value containing fewer high-frequency signals can be acquired, and the motor rotor position and speed information can be estimated better; in the field of sensorless motor control, the great research potential and application prospect are provided, and key parameters are provided for good performance control and motor fault prediction of the electrical vehicle motor.

Description

technical field [0001] The invention relates to a sensorless design method of an electric vehicle motor, in particular to a sensorless control design method based on a novel sliding mode observer design. Background technique [0002] The position sensorless control technology uses the physical quantities that can be directly measured in the motor, such as the DC bus voltage, current and other information, to estimate the position and speed information required for motor control through different control algorithms, thus eliminating the need for mechanical sensors, such as photoelectric encoders. It can reduce the size and cost of the motor, and increase the reliability of the system. At present, the common sensorless observer estimation control techniques for permanent magnet synchronous motors are as follows: [0003] 1) Full-order state observer method: It utilizes a complete motor differential model to estimate the position and speed of the rotor. This method has better...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the traditional sliding mode observer is that it will cause system chattering, which not only affects the accuracy of the control system and increases energy consumption, but also easily excites the high-frequency unmodeled part of the system, destroying the performance of the system, and even making the system Instability, damage to controller components

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