Design of anti-disturbance composite controller of low-speed large-torque direct drive motor

Abstract

The invention belongs to the technical field of electric vehicle permanent magnet synchronous motor control, and discloses a design method of an anti-disturbance composite controller of a low-speed large-torque direct drive motor. The problem that when the permanent magnet synchronous motor of the electric automobile operates at low speed and large torque, an inverter can output discontinuous current, and consequently torque pulsation is caused is solved. The invention provides a low-speed large-torque permanent magnet synchronous motor control method based on a nonsingular terminal sliding mode load observer. Firstly, permanent magnet synchronous motor rotation speed sliding mode control is provided by adopting a sliding mode reaching law of segmented rate adjustment; secondly, providing a non-singular terminal sliding mode load observer aiming at the unknown condition of load disturbance, and establishing an anti-interference composite controller on the basis of rotation speed sliding mode control; and finally, through simulation experiment verification, the method provided by the invention can realize the stability of the output torque and the rotating speed under complex interference.

Description

technical field [0001] The invention belongs to the low-speed and high-torque operating condition of a permanent magnet synchronous motor of an electric vehicle, and in particular relates to a sliding mode control method of a permanent magnet synchronous motor and an application of an observer. Background technique [0002] Low-speed high-torque permanent magnet synchronous motor drive systems are widely used in various fields such as industrial production, oil field exploitation, wind power generation, electric vehicles, etc. However, permanent magnet synchronous motors are usually affected by inherent cogging torque, which will cause speed fluctuations and Vibration of coupling components. Especially at low speeds, the driver and passengers are most likely to feel the vibration. The cogging torque will cause different degrees of vibration according to the motor speed, and the natural frequency of its power transmission system is mainly determined by the half shaft, rotor ...

AI Technical Summary

Problems solved by technology

The traditional control algorithm cannot solve this problem well, and the anti-interference performance of the controller is particularly important

[0009] The significance of solving the above problems and defects is: Although the speed fluctuation and torque fluctuation can be alleviated by improving the mechanical design of electric vehicles, it is not enough when the vehicle is running at low speed

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