Sliding mode variable structure control method based on logarithmic approach rate

Abstract

The invention discloses a sliding mode variable structure control method based on a logarithmic approach rate, is applied to permanent magnet synchronous motor control, and belongs to the field of motor control. The sliding mode variable structure control method based on the logarithmic approach rate comprises the following steps: establishing a mathematical model of a permanent magnet synchronous motor in a rotating coordinate system; defining a novel sliding mode surface function to obtain a derivative function of a sliding mode variable; and designing a logarithmic approach rate function which is used for solving the q-axis current in the permanent magnet synchronous motor in combination with the sliding mode surface function. According to the technical scheme which is established based on a novel sliding mode surface definition mode and a logarithmic function and is implemented on the permanent magnet synchronous motor, through simulink simulation, the result shows that the time required for the permanent magnet synchronous motor to tend to be stable is remarkably shortened while system buffeting is reduced, and the robustness of the system is improved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a sliding mode variable structure control method based on a logarithmic approach rate. Background technique [0002] NdFeB rare earth permanent magnet materials have high residual magnetic induction intensity, high coercivity, and high magnetic energy product. These characteristics greatly promote the development of permanent magnets, so that the practicability of permanent magnet synchronous motors can be reflected. . Compared with other types of motors, permanent magnet synchronous motors have a series of advantages such as small size, good control performance and high efficiency. At present, it is widely used in AC servo systems in many fields such as CNC machine tools and aerospace, and has been widely used. However, in the face of the nonlinear and strongly coupled multivariable system of permanent magnet synchronous motor, the control strategy sometimes cannot meet ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a solution to the problems of low control precision and serious vibration problems in the process of starting and variable load motion control of permanent magnet synchronous motors, defines a new sliding mode surface function, and proposes a new Sliding mode variable structure control strategy with mixed reaching rate

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