Control method of active control type magnetic suspension system free of position sensor

A technology of active control and control method, applied in general control system, control/regulation system, adaptive control, etc., can solve the problems of poor system robustness, achieve good robustness, reduce complexity, and reduce cost Effect

Inactive Publication Date: 2014-04-16
BOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor robustness of the existing active control magnetic levitation system due

Method used

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  • Control method of active control type magnetic suspension system free of position sensor
  • Control method of active control type magnetic suspension system free of position sensor
  • Control method of active control type magnetic suspension system free of position sensor

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specific Embodiment approach 1

[0042] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the control method of position sensorless active control type magnetic levitation system described in this embodiment, it collects and obtains the electric current of the electromagnet coil 7 of magnetic levitation system by current sensor 1, adopts AD converter 2 to collect the current simulation that obtains The signal is converted into a current digital signal, and the position estimation unit 3 obtains the position signal of the suspended object of the magnetic levitation system through calculation according to the current digital signal, compares the position signal of the suspended object with the preset expected position signal, and obtains a position deviation signal, After the controller 4 processes the position deviation signal, it obtains a control signal to the PWM signal generator 5, and the control signal causes the PWM signal generator 5 to generate a voltage pul...

specific Embodiment approach 2

[0043] Specific implementation mode two: the following combination Figure 1 to Figure 12 Describe this embodiment, this embodiment will further explain Embodiment 1, the position estimation unit 3 in this embodiment obtains the position signal of the suspended object of the magnetic levitation system through calculation according to the current digital signal, and compares the position signal of the suspended object with the preset The specific process of obtaining the position deviation signal is as follows:

[0044] The electromagnet inductance L of the magnetic levitation system is:

[0045]

[0046] In the formula, N is the number of turns of the electromagnet coil 7, is the equivalent reluctance of the electromagnet system composed of the electromagnet and the electromagnet coil;

[0047] The electromagnet inductance L is related to the air gap width x between the electromagnet and the suspension. The estimated value of the electromagnet inductance L is obtained thro...

specific Embodiment approach 3

[0058] Specific implementation mode three: the following combination Figure 1 to Figure 12 Describe this embodiment, this embodiment will further explain Embodiment 2, after the controller 4 in this embodiment processes the position deviation signal, the specific process of obtaining the control signal to the PWM signal generator 5 is as follows:

[0059] Controller 4 adopts PID control method, and its transfer function K(s) is:

[0060] K ( s ) = K a ( 1 + T d s ) ( 1 + 1 T i s ) ,

[0061] where K a is the gain term, T d is the differential time constant, T i is the...

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Abstract

The invention relates to a control method of an active control type magnetic suspension system free of a position sensor and belongs to the field of control technology of the magnetic suspension system. The control method solves the problem of poor robustness of the existing active control type magnetic suspension system caused by the existence of the position sensor. A current sensor collects current of an electromagnet coil of the magnetic suspension system, an analog to digital (AD) converter converts a current analog signal into a current digital signal, a position evaluation unit performs calculation to obtain a position signal of a suspended solid of the magnetic suspension system according to the current digital signal, the position signal of the suspended solid is compared with a preset expectation position signal to obtain a position deviation signal, and a control signal to a pulse-width modulation (PWM) signal generator is obtained after the controller performs processing on the position deviation signal. Furthermore, the control signal enables the PWM signal generator to generate a voltage pulse signal with corresponding duty ratio to control an electromagnet coil. The control method of the active control type magnetic suspension system free of the position sensor is used for controlling the magnetic suspension system.

Description

technical field [0001] The invention relates to a control method for an active control type magnetic levitation system without a position sensor, and belongs to the technical field of control of the magnetic levitation system. Background technique [0002] Magnetic levitation technology has broad application prospects due to its excellent characteristics such as low noise, no pollution, and no mechanical contact. It can eliminate frictional resistance, prolong the service life of equipment and reduce energy loss. With the development of control theory, electronic technology, electromagnetic theory and new electromagnetic materials, maglev technology has also made great progress. In recent years, maglev technology has been widely used in many fields, such as maglev trains, maglev bearings, high-speed maglev motors, etc. [0003] The sensor is one of the core components of the existing active control magnetic levitation system. Due to the existence of the position sensor, the...

Claims

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Application Information

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IPC IPC(8): G05B13/04
Inventor 于占东赵旭东尹珅
Owner BOHAI UNIV
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