Position-sensorless permanent magnet synchronous motor control method based on adaptive sliding mode observer

Abstract

The invention discloses a position-sensorless permanent magnet synchronous motor control method based on an adaptive sliding mode observer, and the method comprises the following steps of firstly establishing a mathematical model of the permanent magnet synchronous motor; secondly designing the adaptive sliding mode observer, using a continuous, smooth and strictly monotonic sigmoid threshold function to replace the sgn symbol function in the traditional sliding mode observer, and weakening the system chatter caused by the traditional sliding mode observer; designing a back-EMF adaptive estimation link instead of the traditional low-pass filter to improve Back-EMF estimation accuracy; and finally estimating the rotor position and rotation speed by using the phase-locked loop technology, thereby reducing the motor rotor position angle and rotation speed estimation errors, and finally achieving high-precision position-sensorless control of the permanent magnet synchronous motor.

Description

technical field [0001] The invention relates to a control method for a permanent magnet synchronous motor without a position sensor based on an adaptive sliding mode observer, which is used to estimate the position and speed information of the rotor of the permanent magnet synchronous motor and realize high-precision control of the permanent magnet synchronous motor without a position sensor. Permanent magnet synchronous motor control field. Background technique [0002] With the continuous improvement of the manufacturing process of rare earth permanent magnet materials, the development of permanent magnet synchronous motors has been greatly improved, making them have the advantages of small size, high power density, and high work efficiency. At present, permanent magnet synchronous motors are widely used in military, aerospace, industrial, civil and many other fields. The control system of permanent magnet synchronous motor is a multivariable, nonlinear and strongly coupl...

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Problems solved by technology

The current improvement strategy is the extended sliding mode observer, which can directly observe the back EMF of the motor and avoid the system chattering problem caused by extracting the back EMF from the switching function, but this method makes the structure of the observer extremely complicated; High-order sliding mode observer, this method can realize the motor rotor position and speed estimation, but the design of this method is quite complicated, and the engineering application is difficult

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