An Adaptive Sliding Mode Control Method for Variable Load Permanent Magnet Synchronous Motor Speed ​​Regulation

Abstract

The invention discloses a self-adaption sliding mode control method for speed regulation of a variable-load permanent magnet synchronous motor. According to the method, on the conditions that a speed reference value of the permanent magnet synchronous motor is given and a load changes, second-order finite time disturbance observers are designed respectively for step interference and successive interference, load changes are estimated and compensated for, an absolute value fractional order sliding mode surface is designed, an improved power reaching law method is provided, and a continuous sliding mode controller is designed. A self-adaption sliding mode controller composed of the second-order finite time disturbance observers and the continuous sliding mode controller is used for conducting speed regulation on the permanent magnet synchronous motor to enable the motor to be still capable of running at reference speed after the load changes, and the influences brought by load changes to the rotation speed of the motor are greatly reduced. The self-adaption sliding mode control method inherits good robustness of sliding mode control; meanwhile, the expanded second-order finite time disturbance observers are used for observing step signals, rotation speed fluctuation on the condition that the load changes is reduced, and the driving capacity of the permanent magnet synchronous motor is effectively improved.

Description

technical field [0001] The invention belongs to the field of speed control of permanent magnet synchronous motors, and more specifically relates to an adaptive sliding mode control method for speed regulation of variable load permanent magnet synchronous motors. Background technique [0002] Due to its simple structure, reliable operation, convenient maintenance, high efficiency, no excitation loss and good speed regulation performance, the permanent magnet synchronous motor has a wide range of application prospects in the industrial field, especially in electric vehicles, aerospace and electric tools, etc. . Speed ​​control is one of the important issues in the application of permanent magnet synchronous motors. Because in the application, the permanent magnet synchronous motor often encounters various disturbances, such as load changes, the friction force of the system itself and the operating temperature, etc., which will affect the performance of the permanent magnet sy...

Images