Limited position set position-free control method based on permanent magnet flux linkage observer

A technology of flux linkage observer and control method, applied in control system, control generator, motor control, etc., can solve the problems of not allowing the installation of position sensors and increasing the cost of position sensors.

Active Publication Date: 2021-07-06
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Permanent magnet motors require position feedback for effective control, however, the installation, maintenance and repair of position sensors will increase the cost
In some special cases, it is not even allowed to install position sensors

Method used

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  • Limited position set position-free control method based on permanent magnet flux linkage observer
  • Limited position set position-free control method based on permanent magnet flux linkage observer
  • Limited position set position-free control method based on permanent magnet flux linkage observer

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Embodiment Construction

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0055] A position-free control method for finite position sets based on a permanent magnet flux observer, such as Figure 1-3 shown, including the following steps:

[0056] Step 1: Detection and calculation of current and voltage

[0057] Detect the three-phase current i of the permanent magnet motor a , i b , i c , and after 3s / 2s Clarke transformation, the current i in the two-phase stationary coordinate system is obtained α and i β , detect the DC power supp...

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Abstract

The invention discloses a limited position set position-free control method based on a permanent magnet flux linkage observer. A flux linkage observer of a voltage model method is improved based on a flux linkage calculation method of a current model so as to obtain a more accurate flux linkage for finite position set position-free estimation. A plurality of pieces of position information are discretized from a rotor position at a certain moment, and a permanent magnet flux linkage observer and a designed flux linkage cost function are combined to calculate and evaluate a flux linkage so as to accurately extract an actual rotor position. The improved permanent magnet flux linkage observer has high anti-interference capability, can accurately estimate a two-phase permanent magnet flux linkage in the presence of interference, can estimate high-precision and good-stability position information through a reasonably designed flux linkage cost function, and omits a PI controller. By adopting the limited position set position-free control method based on the permanent magnet flux linkage observer, the precision and robustness of a position-free system can be improved, and the stable operation of the position-free sensor of the permanent magnet motor is ensured.

Description

technical field [0001] The invention relates to the field of permanent magnet motors, in particular to a finite position set non-position control method based on a permanent magnet flux observer. Background technique [0002] The permanent magnet motor has the advantages of simple structure, high efficiency and wide range of applications. Permanent magnet motors require position feedback for effective control, however, the installation, maintenance and repair of position sensors will increase costs. In some special cases, it is not even allowed to install position sensors. Therefore, position sensorless control is of great significance. The positionless sensor is usually obtained from the back electromotive force or flux linkage containing position information, and the accuracy of the back electromotive force or flux linkage calculation will directly affect the accuracy of the non-position. The traditional positionless usually extracts the position and speed from two oppo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08H02P21/13H02P21/18H02P21/30H02P25/022H02P27/08
CPCH02P6/08H02P21/13H02P21/18H02P21/30H02P25/022H02P27/08H02P2207/05
Inventor 林明耀杨安晨林克曼
Owner SOUTHEAST UNIV
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