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A Position Sensorless Control Method for Permanent Magnet Synchronous Motor Based on Smooth Nonsingular Terminal Sliding Mode Observer

A technology of permanent magnet synchronous motor and non-singular terminal, which is applied in motor control, electronically commutated motor control, control system, etc. It can solve the problems of phase lag and inability to accurately obtain the position and speed of the motor rotor, and improve the observation accuracy , the effect of accurate back EMF

Active Publication Date: 2021-06-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The present invention is to solve the phase lag problem caused by the external filtering link in the permanent magnet synchronous motor position sensorless control system of the existing sliding mode observer. It is necessary to compensate the rotation angle estimation, so that the position and speed of the motor rotor cannot be accurately obtained. question

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  • A Position Sensorless Control Method for Permanent Magnet Synchronous Motor Based on Smooth Nonsingular Terminal Sliding Mode Observer
  • A Position Sensorless Control Method for Permanent Magnet Synchronous Motor Based on Smooth Nonsingular Terminal Sliding Mode Observer
  • A Position Sensorless Control Method for Permanent Magnet Synchronous Motor Based on Smooth Nonsingular Terminal Sliding Mode Observer

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specific Embodiment approach 1

[0028] Specific implementation mode one: refer to figure 1 Specifically illustrate this embodiment, the permanent magnet synchronous motor position sensorless control method based on a smooth non-singular terminal sliding mode observer described in this embodiment, the method includes the following steps:

[0029] Step 1. In the αβ-axis coordinate system, a smooth non-singular terminal sliding mode observer is used to track the stator current of the permanent magnet synchronous motor to obtain the stator current deviation;

[0030] Step 2. The stator current deviation is in the state of continuous sliding mode motion. The stator current deviation is processed by the sliding mode surface, and then through the switching action and integral action in the smooth non-singular terminal sliding mode control law, so as to obtain the non-high-frequency switching output vector u, according to which output vector u obtains back electromotive force;

[0031] Step 3: Obtain the rotationa...

specific Embodiment approach 2

[0034] Specific embodiment two: This embodiment is a further description of the permanent magnet synchronous motor position sensorless control method based on a smooth non-singular terminal sliding mode observer described in specific embodiment one. In this embodiment, in step one, use The smooth non-singular terminal sliding mode observer tracks the stator current of the permanent magnet synchronous motor, and the process of obtaining the stator current deviation is:

[0035] In the αβ-axis coordinate system, the stator voltage equation of the permanent magnet synchronous motor is:

[0036]

[0037] where u α , u β are the stator voltage in the αβ coordinate system; i α , i β are the stator currents in the αβ coordinate system; L and R s are the winding equivalent inductance and resistance respectively; e α , e β Respectively, the counter electromotive force in the αβ coordinate system is expressed as:

[0038]

[0039] ω e is the electrical angular velocity of th...

specific Embodiment approach 3

[0049] Specific embodiment three: This embodiment is a further description of the permanent magnet synchronous motor position sensorless control method based on a smooth non-singular terminal sliding mode observer described in specific embodiment two. In this embodiment, in step two, the stator When the current deviation is in the state of continuous sliding mode motion, the stator current deviation is processed by the sliding mode surface, and then through the switching action and integral action in the smooth non-singular terminal sliding mode control law, so as to obtain the output vector u without high frequency switching The process is:

[0050] According to Equation 6, the smooth non-singular terminal sliding mode surface is set as:

[0051]

[0052] Set the smooth non-singular terminal sliding mode control law u as:

[0053] u=u eq + u n Formula 8,

[0054] Among them, u eq is the equivalent control component, u n To switch control components,

[0055] Based ...

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Abstract

The invention relates to a position sensorless control method of a permanent magnet synchronous motor based on a smooth non-singular terminal sliding mode observer, and relates to the technical field of the position sensor. The present invention is to solve the phase lag problem caused by the external filtering link in the permanent magnet synchronous motor position sensorless control system of the existing sliding mode observer. It is necessary to compensate the rotation angle estimation, so that the position and speed of the motor rotor cannot be accurately obtained. question. In the αβ-axis coordinate system, the stator current of the permanent magnet synchronous motor is tracked by a smooth non-singular terminal sliding mode observer to obtain the stator current deviation; the stator current deviation is in the state of continuous sliding mode motion, and the stator current deviation passes through the sliding mode surface After the processing of the smooth non-singular terminal sliding mode control law, the output vector u without high-frequency switching is obtained, and the back electromotive force is obtained; the speed and rotor position of the permanent magnet synchronous motor are obtained according to the back electromotive force . It is used to accurately obtain the motor rotor position and speed.

Description

technical field [0001] The invention relates to a position sensorless control method of a permanent magnet synchronous motor based on a smooth non-singular terminal sliding mode observer, and belongs to the technical field of position sensors. Background technique [0002] (1) The existing position sensorless control method of permanent magnet synchronous motor based on sliding mode observer has the problems of phase delay and rotation angle compensation, resulting in low observation accuracy and complicated implementation. [0003] In the permanent magnet synchronous motor control system, the acquisition of speed and rotor position information usually uses mechanical sensors and observer-based positionless sensors. In contrast, mechanical sensors have high cost, complex hardware system composition, large volume, and low efficiency. The shortcomings make the position sensorless technology become an emerging research hotspot and future development trend. The position sensorl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/182
CPCH02P6/182H02P2207/05
Inventor 王艳敏杨铭洋于玲管贺诗买永锋
Owner HARBIN INST OF TECH
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