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Integrated digital control method based on generalized control mode for electromagnetic bearing

A control method, electromagnetic bearing technology, applied in the direction of bearings, shafts and bearings, program control, etc., can solve the problems of magnetic bearing control systems and digital control systems that have not yet appeared, and achieve the effect of improving the degree of integration and reducing costs.

Active Publication Date: 2021-05-25
AECC SICHUAN GAS TURBINE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1) There is no control system for magnetic bearings that can realize three control methods at the same time;
[0009] 2 There is no digital control system based on a single DSP that can realize five degrees of freedom and three-level mode

Method used

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  • Integrated digital control method based on generalized control mode for electromagnetic bearing
  • Integrated digital control method based on generalized control mode for electromagnetic bearing
  • Integrated digital control method based on generalized control mode for electromagnetic bearing

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Embodiment 1

[0055] Below in conjunction with accompanying drawing, the present invention will be further described:

[0056] Such as figure 1 As shown, the present invention comprises DSP core board 1 (comprising A / D module 2, calculation module 3, SPI module 4 and EPWM module 5), Ethernet module 6, computer 7, power conversion board 8 (comprising cache memory module 9, An optocoupler module 10 , a driving module 11 , an H half-bridge transducing circuit 12 ), an actuating device 13 , a signal monitoring module 14 , and a signal conditioning module 15 .

[0057] refer to figure 1 The main chip of the DSP core board is TMS28377D or TMS28379D of TI Company. The main chip of the Ethernet module is W5500. The Ethernet module is inserted on the DSP core board. On the signal conditioning module, the digital and analog grounds on the signal conditioning board are wired separately. The signal conversion board is connected to the power conversion board through a cable. Each power conversion boar...

Embodiment 2

[0061] refer to figure 2 , is the structure of the generalized controller of the present invention. The feedback signal directly measured by the present invention has three items: displacement, current, and bus voltage. The voltage of each coil can be calculated by using the bus voltage and the duty cycle data in the controller. Therefore, there are three effective state feedback parameters available: displacement, current, and voltage. Any control method can be realized by adjusting the values ​​of the seven feedback parameters. Typical construction methods are:

[0062] 1) Current control: set P u and I u set to zero, choose a larger P i and the appropriate I i , close the current loop, simplify the electromagnetic bearing system to a second-order model, and then adjust P s , I s with D s optimization, the current control method can be implemented, and the typical feature of the current method is that it requires a large P i , is completely determined by the hardware...

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Abstract

The invention provides an integrated digital control method based on a generalized control mode for an electromagnetic bearing. The method comprises the following steps of measuring a displacement signal x, a current signal i and a bus voltage signal U; calculating a coil voltage u corresponding to each coil by means of the bus voltage signal U and a preset duty ratio a; according to the displacement signal x, the current signal i, the bus voltage signal U, the coil voltage u and physical parameters of a control object, presetting a displacement proportion feedback coefficient P , a displacement integral feedback coefficient I , a displacement differential feedback coefficient D , a current proportion feedback coefficient P , a current integral feedback coefficient I , a voltage proportion feedback coefficient P and a voltage integral feedback coefficient I of a controller; and controlling an electromagnetic bearing by adjusting the displacement proportional feedback coefficient P , the displacement integral feedback coefficient I , the displacement differential feedback coefficient D , the current proportional feedback coefficient P , the current integral feedback coefficient I , the voltage proportional feedback coefficient P and the voltage integral feedback coefficient I .

Description

technical field [0001] The invention belongs to the force control system design technology, in particular to an integrated digital control method for electromagnetic bearings based on a generalized control mode. Background technique [0002] Electromagnetic bearing is a new type of high-performance bearing that uses electromagnetic force to suspend the rotor in space, so that there is no mechanical friction support between the rotor and the stator. It is a typical mechatronic product. It has a series of excellent qualities such as high speed, no contact, no need for lubrication and sealing, small vibration, long service life and low maintenance cost. [0003] The electromagnetic bearing is mainly composed of two parts: the control system and the actuator: the actuator includes the stator and the rotor. Since the electromagnetic bearing has the characteristics of open-loop instability, a controller must be used for online closed-loop control. The controller outputs instruct...

Claims

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Application Information

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IPC IPC(8): F16C32/04G05B19/042
CPCF16C32/0455G05B19/0423
Inventor 叶本远郜伟强李朋宾刘廷武杨坤山刘傲然李自强赵熠
Owner AECC SICHUAN GAS TURBINE RES INST
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