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Construction Method of Continuous Time System for Displacement Detection of Radial Magnetic Bearing

A technology of time system and displacement detection, which is applied in control system, vector control system, electronic commutation motor control, etc. It can solve the problems of poor detection accuracy and real-time performance of magnetic bearing displacement, restriction of maximum rotational speed of magnetic bearing, difficulty in maintenance, etc.

Active Publication Date: 2018-09-28
JIANGSU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the linear control control theory is relatively mature, compared with the nonlinear control method, the displacement detection accuracy and real-time performance of the magnetic bearing are poor. The present invention proposes a nonlinear control method that applies the volumetric Kalman filter to the magnetic bearing It can effectively improve the displacement detection accuracy and real-time
[0003] At present, the method of obtaining the radial displacement of the rotor is mostly a mechanical eddy current displacement sensor, but the displacement sensor has many defects: on the one hand, it restricts the maximum speed of the magnetic bearing; on the other hand, it is difficult to maintain, which affects the reliable operation of the entire control system. and limits its application in harsh environments
After retrieving relevant patents and documents at home and abroad, there is no displacement sensorless control method and device for volumetric Kalman filter applied to magnetic bearings

Method used

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  • Construction Method of Continuous Time System for Displacement Detection of Radial Magnetic Bearing
  • Construction Method of Continuous Time System for Displacement Detection of Radial Magnetic Bearing
  • Construction Method of Continuous Time System for Displacement Detection of Radial Magnetic Bearing

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Embodiment 1

[0043] Such as figure 1 As shown, this embodiment 1 provides a method for constructing a continuous-time system for radial magnetic bearing displacement detection, including the following steps:

[0044] Step S1, calculating the levitation force on the rotor in the directions of the three magnetic poles;

[0045] Step S2, establishing a continuous time system.

[0046] Specifically, the method for calculating the levitation force on the rotor in the direction of the three magnetic poles in the step S1 includes:

[0047] Step S11, calculate the magnetic flux of the air gap of each magnetic pole, which is shown in formula (1):

[0048]

[0049] In formula (1), Φ A 、Φ B 、Φ C are the magnetic fluxes corresponding to the air gaps of the three-phase magnetic poles; N 3 is the equivalent number of turns in the x and y directions; R A , R B , R C are the reluctances of the air gaps of the three poles; i A i B i C are the currents flowing through the three poles respecti...

Embodiment 2

[0095] On the basis of Embodiment 1, Embodiment 2 provides a radial magnetic bearing displacement detection method, including:

[0096] According to the continuous time system, the radial displacement output signal and rotational speed signal of the rotor in the x and y directions are obtained, and the continuous time system is discretized to realize the volumetric Kalman filter algorithm to extract the displacement information of the rotor.

[0097] Wherein, the method for extracting the displacement information of the rotor by the volumetric Kalman filter algorithm includes: generating the current I by the volumetric Kalman filter according to the voltage source inverter A , I B , I C Extracted current signal x cub and y cub , and obtain the displacement output signal x of the radial magnetic bearing in the x and y directions through the observer est and y est , where the displacement output signal x est and y est It also represents the displacement information of the...

Embodiment 3

[0101] On the basis of Embodiment 1, Embodiment 3 provides a displacement detection method for a radial magnetic bearing.

[0102] The radial magnetic bearing displacement detection method includes: building a feedback loop through a volumetric Kalman filter to adjust the current generated by the voltage source inverter to drive the magnetic bearing to achieve closed-loop stable suspension.

[0103] Specifically, a feedback loop is constructed through a volumetric Kalman filter, namely

[0104] The current I is generated by the volumetric Kalman filter according to the voltage source inverter A , I B , I C Extracted current signal x cub and y cub , and obtain the displacement output signal x of the radial magnetic bearing in the x and y directions through the observer est and y est , with a given reference position signal x ref and y ref For comparison, after the obtained result is processed by the first P controller, it is respectively compared with the speed signal v...

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Abstract

The invention relates to a volume kalman filter-based radial magnetic bearing displacement detection method and system. The radial magnetic bearing displacement detection method comprises the steps of obtaining radial displacement output signals and rotating speed signals of a rotor in an x direction and a y direction according to a continuous time system and discretizing the continuous time system to achieve extraction of displacement information of the rotor by a volume kalman filter algorithm. According to the volume kalman filter-based radial magnetic bearing displacement detection method and system, linear processing of a radial magnetic bearing which is a nonlinear model essentially is avoided; operation of a displacement-free sensor is achieved; the detection system has very high interference rejection capability; the radial magnetic bearing displacement can be accurately detected; and the radial magnetic bearing displacement can also be detected when the exact nature of the system is unknown.

Description

technical field [0001] The invention relates to a method for accurately measuring the radial magnetic bearing displacement detection method in the field of high-speed high-precision motor transmission, which is mainly used for modern equipment such as artificial satellites and missiles, as well as high-performance flywheel energy storage, generators, artificial heart pumps, etc. The utility model belongs to the field of electric drive control equipment. Background technique [0002] Compared with mechanical bearings, magnetic bearings have the advantages of high speed, no wear, long life, and no lubrication. Magnetic bearings are widely used in power transmission fields such as flywheel energy storage, high-speed high-precision motors, and artificial heart pumps, and are especially suitable for harsh environments such as high temperatures. The magnetic bearing is essentially an open-loop unstable nonlinear system, so it is necessary to design a closed-loop control system to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/18
CPCH02P21/14
Inventor 杨益飞张伏春贺乃宝成丽珉
Owner JIANGSU UNIV OF TECH
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