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Speed-adaptive sliding mode observer-based sensorless motor control method

A technology of adaptive sliding mode and sliding mode observer, which is applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve the problems of phase delay and inability to completely eliminate high-frequency signals, and achieve improved stability , Improve observation accuracy and ensure stability

Inactive Publication Date: 2018-10-12
ZHEJIANG UNIV
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Problems solved by technology

The traditional sliding mode observer uses a sign function as the switching function, and there is an inherent chattering signal in the actual control quantity, and the low-pass filter cannot completely eliminate the high-frequency signal, and it will also cause a phase delay

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  • Speed-adaptive sliding mode observer-based sensorless motor control method
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  • Speed-adaptive sliding mode observer-based sensorless motor control method

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0038] Such as Figure 1 to Figure 3 As shown, the sensorless control method based on the speed adaptive sliding mode observer, including the sliding mode observer, the back-EMF observer and the phase-locked loop, obtains the two-phase stationary coordinate according to the input voltage and current in the two-phase stationary coordinate system Based on the extended back-EMF under the system, a back-EMF observer is constructed based on the extended back-EMF equivalent control quantity. Based on the Lyapunov stability, the speed feedback is obtained, and the estimated position of the extended back-EMF after passing through a phase-locked loop is estimated. , Used for coordinate transformation.

[0039] Among them, the back EMF observer extracts the equivalent quantity V in the back EMF signal from the output signal of the sliding mode observer α And V β , And ext...

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Abstract

The invention discloses a speed-adaptive sliding mode observer-based sensorless motor control method. A sliding mode observer obtains extended counter electromotive force under a two-phase static coordinate according to input voltage and current under the two-phase static coordinate; a position observer is constructed on the basis of equivalent control quantity of the extended counter electromotive force; a speed-adaptive observation law is deduced for speed feedback on the basis of Lyapunov stability analysis; and a signal of the position observer passes through a phase-locked loop and then outputs an estimated position for coordinate transformation. No filter is used in the whole process, so that phase lag and the system instability caused by the adoption of the filter are avoided. The position observer disclosed by the invention is combined with the speed-adaptive observation law, so that a chattering signal in the observed quantity is eliminated, the observation accuracy of the position and rotating speed of a rotor is improved and the stability of the system is also further improved.

Description

Technical field [0001] The invention relates to the field of motor control, and more specifically, it relates to a sensorless motor control method based on a rotating speed adaptive sliding mode observer. Background technique [0002] In recent years, built-in permanent magnet synchronous motors have been widely used because of their simple structure, high efficiency, and high power density. The high-performance control of the built-in permanent magnet synchronous motor requires feedback of rotor position and speed information, but the installation of mechanical sensors will increase the cost and volume of the system, and also reduce the reliability of the system. The position / speed sensorless control detects the current signal in the winding and obtains the rotor position and speed through a certain control algorithm, which has become a hot spot in the research of motor control systems. [0003] At present, according to different implementation principles, the sensorless algorith...

Claims

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Application Information

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IPC IPC(8): H02P21/24H02P21/00
CPCH02P21/0007H02P21/24
Inventor 黄晓艳尤朝杰
Owner ZHEJIANG UNIV
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